Cordless Roller Shade Systems – Cordless Curtain Solution Provider | Dosron

Custom Window Blind Clutch Systems for OEM Roller Blinds

amy — Mon, 08 Dec 2025 07:09:10 +0000

Custom Window Blind Clutch Systems for OEM Roller Blinds

Quick Summary

DOSRON custom window blind clutch systems are engineered for OEM roller and fabric blind programs that need
reliable lifting, smooth operation and flexible customization.
With modular clutches for Ø25 / Ø28 / Ø32 / Ø38 mm tubes, configurable gear ratios and chain options, we help blind
manufacturers build differentiated collections for residential, commercial and hospitality projects – all on a stable,
easy-to-assemble platform.

What Is a Custom Window Blind Clutch System?

A window blind clutch system is the mechanical core that transfers the user’s pull on a
beaded chain into controlled rotation of the blind tube. Instead of relying on friction only, the clutch
uses internal gears and pawls to:

Lift and lower the blind fabric smoothly and predictably.
Hold the blind at any height without drifting down.
Manage load from different fabric weights and sizes.

DOSRON designs custom window blind clutch systems as a family of drop-in modules. OEM partners can match clutch
spec (tube size, gear ratio, chain type and mounting style) to each SKU, while keeping a unified look and shared components
across the whole collection.

Key Features of DOSRON Custom Window Blind Clutch Systems

2.1 Engineering Core

High-precision gear train: Optimized tooth profile for low backlash, smoother pull and reduced noise.
POM & reinforced nylon housing: Low-friction, wear-resistant polymers for long service life in daily use.
Steel drive shaft: Ensures torsional rigidity on wider blinds and heavier fabrics.
Positive locking mechanism: Holds the tube securely to prevent creeping or sudden drops.

2.2 Customization Options for OEM Programs

Tube compatibility: Modules for Ø25 / Ø28 / Ø32 / Ø38 mm aluminum tubes.
Gear ratios: Multiple ratios (e.g. 1:1 / 1:1.5 / 1:2 / 1:3) to balance pull force and speed.
Chain choices: Plastic or metal chains, different pitches and colors, ready for global markets.
Bracket interface: Clip-in or screw-fix options to match your existing headrail and mounting style.
Branding options: Discreet logo placement on end caps or brackets for private-label programs.

2.3 Performance & User Experience

Stable pull force: Optimized gearing keeps chain tension light but consistent across the blind travel.
Quiet operation: Guided contact surfaces and polymer damping reduce mechanical noise during lifting.
Smooth stacking: Even fabric roll-up to protect fabric edges and minimize telescoping.
Wide size coverage: Models available for compact shades and large picture windows.

Technical Specifications

The table below shows typical parameters for DOSRON custom window blind clutch systems. Values can be tuned based
on your tube profile, fabric type and target markets.

Model	Tube Size (mm)	Gear Ratio	Recommended Shade Width (mm)	Max Shade Weight (kg)	Chain Type & Pitch	Typical Applications
DS-C25-10	Ø25	1:1	400 – 1600	≤ 3	Plastic #10, 4.5 mm	Small residential roller blinds
DS-C28-15	Ø28	1:1.5	600 – 2200	≤ 5	Plastic #10, 4.5 mm	Living room & office roller blinds
DS-C32-20	Ø32	1:2	800 – 2600	≤ 7	Plastic or metal, 4.5–6.0 mm	Commercial and hospitality blinds
DS-C38-30	Ø38	1:3	1000 – 3200	≤ 10	Heavy-duty metal, 6.0 mm	Large windows & project blinds

*Values above are reference ranges. Final selection should follow your own load calculations, tube design and safety requirements.

Safety & Compliance Considerations

While clutched blinds still use a chain, a well-designed system helps OEM brands meet modern child-safety expectations
and local regulations:

Chain tensioners & guides to keep the chain fixed to the wall and reduce strangulation risk.
Controlled pull force through correct gear ratio, avoiding excessive resistance for elderly or children.
Stable locking to prevent accidental free-fall of the blind when the chain is released.
Compatibility with cordless upgrade paths (e.g. spring-assisted cordless systems) for higher-risk SKUs.

DOSRON supports OEM partners with data sheets and guidance so clutched blinds can coexist with cordless and
motorized ranges in a single, safety-first portfolio.

Typical Application Scenarios

Residential roller blinds: Living rooms, bedrooms and home offices using light-filtering or blackout fabrics.
Office & commercial spaces: Open-plan offices, meeting rooms, training rooms with standardized window modules.
Retail & hospitality: Hotels, serviced apartments and shops that need robust, easy-to-service hardware.
Project and contract markets: Large roll-outs where stable quality and easy replacement are critical.

Integration with Cordless & Motorized Systems

Many brands run mixed hardware strategies by market and price level. DOSRON clutch systems are designed to sit
alongside other DOSRON platforms:

Cordless spring units: For nurseries and family-focused ranges, upgrade to
cordless spring lift systems with no front chain at all.
Tubular motor upgrades: Use the same tube profiles with
battery tubular motors for smart-home or premium channels.
Hybrid collections: Offer clutched blinds as the entry level, cordless as mid-tier, and motorized as top tier –
all built around related components to simplify supply chain and training.

OEM / ODM Support for Clutch-Based Blind Programs

DOSRON works with blind manufacturers, fabricators and brand owners to turn
custom window blind clutch systems into complete product programs:

Engineering support: Tube drawings, bracket interfaces and load estimates for your key fabric SKUs.
Sample & pilot runs: Pre-production kits for lab testing and first store sets.
Custom colors: White, black, grey and project-specific colors for visible parts.
Documentation: Assembly guides, installer sheets and basic safety instructions.
Packaging options: Bulk industrial packing or retail-ready packing for DIY markets.

Field Insight – How to Position Custom Clutch Systems in Your Range

For many OEM brands, clutched roller blinds are still the volume backbone of the portfolio. The real upgrade is not
“any clutch”, but a consistent, modular clutch family that works from entry-level to project grade. By standardizing on
DOSRON’s platform, you can:

Reduce SKU chaos – fewer core mechanisms, more fabric and color freedom.
Improve user feel – smoother pull and lower noise across all blind sizes.
Support safety strategy – easy to segment clutched vs cordless vs motorized SKUs by market.
Shorten development time – reuse the same interfaces when launching new collections.

If you are planning to refresh your roller blind range, or to align clutched blinds with cordless and
smart-home lines, a unified custom window blind clutch system is a practical first step.

38mm Cordless Manual Roller Blinds Spring Lift Mechanism For Bedroom

vc-admin — Thu, 16 Oct 2025 10:12:59 +0000

Quick Summary

The DOSRON 38mm Cordless Manual Roller Blinds Spring Lift Mechanism offers smooth and reliable lifting for bedroom applications. Its compact design combines a constant-force spring with a precision-engineered mechanism, ensuring safe, child-friendly operation and effortless control. The mechanism provides whisper-quiet functionality and extended durability, perfect for residential use.

Product Overview

Enhance your bedroom with the DOSRON 38mm Cordless Manual Roller Blinds Spring Lift Mechanism, ideal for windows that require a streamlined, safe, and silent solution. The precision-engineered spring core ensures smooth, stable lifting, while the cordless design ensures compliance with child safety standards.

Technical Specifications

Series	Spring Model	Maximum Tension	Itinerary Reference
Roller Blinds A Series	38RB-09-350	350	112″-2800mm
	38RB-10-500	500	102″-2600mm
	38RB-11-600	600	96″-2400mm
	38RB-12-700	700	96″-2400mm
Zebra Blinds B Series	38ZB-07-350	250	96″-2400mm
	38ZB-08-350	350	84″-2130mm
	38ZB-09-400	400	72″-1830mm
	38ZB-10-450	450	64″-1620mm
	38ZB-11-550	550	60″-1524mm
	38ZB-12-700	700	54″-1370mm

All spring systems are rigorously tested for over 50,000 lift cycles to guarantee smooth, reliable performance and precision stability.

Key Advantages & Features

Stable Torque Performance

Ensures smooth, balanced operation with no sudden rebound or drag, creating an optimal user experience.

Whisper-Quiet Design

The system operates at less than 40dB, ensuring quiet functionality in both residential and office environments.

Durable Construction

The combination of 301 stainless steel and POM housing guarantees durability, longevity, and minimal wear over time.

Easy Installation

The compact 32mm modular design allows for seamless integration into various blind types, reducing assembly time for OEMs and installers.

Maintenance and Installation Guide

Precision Spring Core

The spring is engineered for constant torque, ensuring the shade stays at any height without slipping or bouncing.

Friction-Optimized Housing

Engineered with a low-resistance POM casing to minimize friction during operation and protect internal components from dust and wear.

Silent Braking Control

A self-balancing damping mechanism absorbs start/stop impacts, ensuring a smooth, quiet operation.

Aluminum End Caps

Lightweight and anodized for enhanced structural stability, ensuring a perfect fit with roller tubes.

Durability & Safety Protections

Cycle Testing: Validated for over 10,000 operations under full load.
Thermal Stability: Materials tested to maintain elasticity from 0–40°C.
Safety Compliance: Compliant with CPSC 16 CFR 1260 and EN 13120 standards.
Corrosion Resistance: All metallic parts pass salt-spray testing for maximum durability.

Applications

Roller Blinds
Zebra / Sheer Blinds
Honeycomb Blinds
Roman / Shangri-La Shades
Residential and Office Installations
OEM / ODM Blind Systems

OEM & ODM Services

DOSRON offers comprehensive OEM/ODM support, including:

Private labeling and logo customization
Custom torque range and spring ratio design
Compatibility adjustments for various blind tubes
Engineering training and technical documentation

Field Performance Feedback

In recent OEM applications, end-user satisfaction improved by 18% due to quieter operation and smoother lift motion. Installers noted faster setup times and reduced after-sales adjustments compared to traditional corded systems.

Field Insight: How DOSRON Redefines Quiet Precision in Cordless Spring Systems

The DOSRON 38mm Cordless Manual Roller Blinds Spring Lift Mechanism represents a new standard in silent and stable window shade technology — integrating precision-engineered torque balance and noise-reduction mechanics for seamless operation.

What Makes It Stand Out:
• Consistent torque with smooth, rebound-free lifting.
• Whisper-quiet operation below 40dB.
• 10,000+ cycle endurance testing.
• Full OEM/ODM customization and engineering support.

Designed and assembled in Xiamen, China, each DOSRON system embodies our belief: “Smart motion begins with precision — and endures with silence.”

FAQ

Q1: What is the MOQ?

Minimum order quantity is 100 pcs for standard models. Samples available for testing.

Q2: What is the warranty period?

All DOSRON spring mechanisms include a 5-year warranty for non-human defects.

Q3: Do you offer customization?

Yes. We provide OEM/ODM services including torque tuning, branding, and structure redesign.

Q4: What’s the average delivery time?

Production lead time is typically 20–25 working days for orders under 1,000 units.

Q5: How do I choose the right model?

Send your tube size, fabric weight, and desired lifting strength, and our engineers will recommend the most suitable spring model.

Privacy Flawless Operation Blackout Blinds Spring Loaded For Classroom

vc-admin — Thu, 16 Oct 2025 10:13:33 +0000

Quick Summary — Spring Loaded Classroom Blackout Mechanism

The DOSRON Spring Loaded blackout classroom mechanism is a cordless in-tube
spring core for cordless roller blinds (also known as roller shades). Using a compact
Cordless Roller Spring Mechanism installed inside the aluminum tube, it balances
blind fabric weight so teachers and students can lift and lower the blind smoothly, with no chains,
no hanging cords, and reliable privacy for projectors and exams.

Spring Loaded Blackout Cordless Roller Blinds for Modern Classrooms

The DOSRON Spring Loaded blackout mechanism is engineered as an in-tube spring accessory
for cordless roller blinds in school classrooms, training rooms, and lecture halls
that need fast, quiet and cordless light control.
By integrating a constant-force Spring Loaded module inside the aluminum tube, the system replaces
traditional chain clutches with a clean Cordless Roller Spring Mechanism.
Teachers simply pull the bottom bar to lower the blind and pull up to let it rise, while the spring keeps
movement controlled and stable at any height.

For OEM brands and project integrators, this Spring Loaded architecture provides a repeatable
tube-based platform that is easy to assemble in the factory, easy to install on site, and easy to operate every day
in real classrooms as part of a cordless roller blind program.

Key Features of the Spring Loaded Classroom Mechanism

Cordless and chain-free: The Spring Loaded module removes exposed chains and cords, improving safety around children.
Stable hover: Carefully tuned torque lets the blind stop and hold at any height without drifting.
Quiet operation: Internal guides and bushings keep the Spring Loaded motion smooth and low-noise.
Compact design: The Cordless Roller Spring Mechanism fits common classroom brackets and 32 mm aluminum tubes.
Classroom-ready blackout: Optimized for blackout and dim-out blind fabrics used with projectors and exam environments.

Materials & Engineering of the Spring Loaded Module

Inside the aluminum tube, the DOSRON Spring Loaded mechanism combines engineered materials and precise
geometry to deliver repeatable performance day after day:

Spring core: Constant-force spiral spring strip in high-fatigue spring steel or stainless steel for long cycle life.
Housing: POM / PA6 engineering plastics with low friction and good dimensional stability in changing classroom climates.
Tube interface: Reinforced cap-like hub that plugs into 32 mm aluminum tubes on the drive side.
Guides and bushings: Low-noise guidance keeps the Spring Loaded rotation centered and reduces fabric skew.
Surface treatment: Anti-corrosion coating on the spring strip to support humid or coastal school environments.

Each element is chosen so the Spring Loaded torque curve remains stable over time,even with frequent daily use and varying classroom temperatures.

Structure & Performance of the Spring Loaded Mechanism

The DOSRON Spring Loaded architecture is built for repetitive classroom use, where cordless roller blinds
may move dozens of times per day:

Core layout: Spring cassette, tube hub, damping interface and bearing support integrated in a compact in-tube module.
Reinforced fixation: Anti-rotation details inside the aluminum tube prevent the Spring Loaded cassette from slipping.
Target cycle life: Designed for high cycle life under typical school loads, reducing service calls.
Noise control: Quiet operation to avoid distraction in teaching and exam environments.
Adjustable pre-tension: Installers can fine-tune the Spring Loaded balance after fabric and bottom rail are confirmed.

How the R32 Spring Loaded Assembly Works Inside the Aluminum Tube

In the DOSRON R32 design, the Spring Loaded assembly behaves like a cap fitted into the
right side of the aluminum tube. The blind fabric is fixed into the longitudinal groove on the
tube surface with one edge, then wrapped around the tube. Every time the blind is pulled down, the aluminum tube
rotates, while both ends are held by the R32 assembly and the component on the left side.

The left side of the tube can be configured in two ways for cordless roller blinds:

Option 1 — Idler: Insert an idler (empty Shaft/Idler) on the left side. In this case, the blind lift is fully manual, driven only by the R32 Spring Loaded assembly.
Option 2 — DOSRON Tubular Motor: Insert a DOSRON Tubular Motor on the left side. In this configuration, the blind can be operated electrically via remote control, and manual intervention is still possible according to the motor design and project setup.

With this structure, the R32 Spring Loaded core on one side and the idler or DOSRON Tubular Motor on the other
side share the same aluminum tube, making it easy to switch between manual-only cordless roller blinds and
motor-ready cordless roller blind lines without changing the basic tube and fabric concept.

R32 Spring Loaded Architecture for Classroom Cordless Roller Blinds

The DOSRON R32 Spring Loaded assembly is a finished spring core designed specifically for 32 mm aluminum tubes in classroom cordless roller blinds.
It delivers a compact cordless solution based on a constant-force Spring Loaded concept,helping OEM brands upgrade existing 32 mm tube systems without redesigning the whole blind.

Each R32 Spring Loaded unit is built from a consistent component stack:
Spring Box, Brake, Shaft, and fixing parts including the Pin and Circlip. The Spring Box defines the torque profile, the Brake stabilizes motion, the Shaft interfaces with the 32 mm aluminum tube, and the pin/circlip secures the spring box to prevent it from shifting.

R32 Spring Box Variants & Load Matching

Fabric length/inch Spring Spec./mm	26″	36″	48″	54″	60″	64″	72″	84″	96″	104″	Top rebound force	Unit
0.07161999	136	150	167	175	183	189	200	217	233	244	50	g
0.08161999	189	205	223	232	241	247	259	277	295		75	g
0.09162000	263	288	317	332	346	356	376				100	g
0.10162000	333	365	404	423	442	455	481				125	g
0.11162000	444	480	524	546	567	582					175	g

Within the R32 family, the Spring Box is the key variable that adapts the Spring Loaded mechanism to different blind weights. The R32 platform uses five Spring Box variants, each tuned for a specific total mass of blind fabric and bottom rail on 32 mm tubes.

Selection is based on the combined weight of the blind fabric and bottom rail on a 32 mm aluminum tube.
Each Spring Box offers a defined Spring Loaded torque curve to keep lift force light and hover stable.
Five torque levels allow coverage of light, medium and heavier blackout fabrics within one R32 platform.
Engineering teams only need to choose the appropriate R32 Spring Box code per fabric package.

Once the correct R32 Spring Box is chosen, the rest of the Spring Loaded stack (Brake, Shaft, Pin and Circlip)
remains unchanged, simplifying purchasing, warehousing and assembly.

R32 Spring Loaded vs Motorized Control with DOSRON Tubular Motor

The R32 platform supports both manual and motorized classroom configurations. In its standard form,the R32 Spring Loaded assembly works as a cordless manual mechanism: teachers and students operate the blind by hand via the bottom bar, while the internal spring balances the load and the Brake controls speed and hover.

When projects require automation, the same 32 mm aluminum tube architecture can be combined with a DOSRON Tubular Motor on the opposite side. Only in this combined configuration does the system offer fully motorized up/down control via remote. The R32 Spring Box still helps balance the blind weight, while the motor provides the driving force.

R32 manual Spring Loaded mode: R32 assembly + idler for cordless push–pull classroom roller blinds.
R32 motorized mode: R32 Spring Loaded + DOSRON Tubular Motor for remote-controlled cordless roller blinds.
Shared 32 mm aluminum tube platform: Both modes reuse the same tube geometry, reducing engineering work.

This makes it easy to build a tiered classroom portfolio: R32 Spring Loaded blinds for standard rooms,and R32 + DOSRON Tubular Motor sets for premium lecture halls, labs and multi-media spaces.

Why Choose R32 Spring Loaded Cores for Classroom Programs?

Focusing on the R32 Spring Loaded platform gives OEM brands and project buyers a clear,standardized base for 32 mm classroom cordless roller blinds:

Platform focus: One dedicated Spring Loaded design optimized for 32 mm aluminum tubes.
Simple selection: Five R32 Spring Box options to match different blind fabric and bottom rail weights.
Flexible control: Manual R32 Spring Loaded now, easy upgrade to R32 + DOSRON Tubular Motor later.
Classroom-ready behavior: Quiet, stable and safe operation tuned for real teaching environments.

For education projects that already standardize on 32 mm aluminum tubes, adopting the R32 Spring Loaded core turns the mechanism into a predictable, scalable component:
easier to specify, easier to stock and easier to maintain throughout the life of the building.

Classroom Applications for Spring Loaded Blackout Blinds

In real projects, the DOSRON Spring Loaded mechanism is used anywhere a classroom or training space
needs quick blackout and glare control with cordless roller blinds:

Projector walls in primary and secondary school classrooms.
Language labs and computer rooms where screens must remain readable.
Exam rooms and testing centers that require consistent light levels.
Lecture halls and training rooms in universities and corporate campuses.
Multi-purpose rooms used for parent meetings, assemblies and presentations.

By using one Spring Loaded platform, facility managers can standardize operation across many rooms and buildings.

Installation & On-Site Adjustment

The Cordless Roller Spring Mechanism is designed so installers can work quickly while still achieving a professional result:

Fix the blind fabric edge into the tube groove, wrap the fabric.
Insert the Spring Loaded assembly into the right side of the 32 mm tube and the idler or DOSRON Tubular Motor into the left side.
Mount the brackets as with a standard roller blind tube set，and install the roller blind on the bracket.
Test lift and hover, then add or reduce pre-tension if needed.
Confirm that the cordless roller blind rises smoothly and stops reliably at any classroom teaching height.

Clear adjustment points and repeatable Spring Loaded behavior help reduce installation time and minimize call-backs from schools.

OEM / ODM Programs for Spring Loaded Classroom Lines

DOSRON supports OEM and ODM cooperation around the Spring Loaded platform. Brands can integrate this Cordless Roller Spring Mechanism into their own 32 mm tube systems for cordless roller blinds while keeping a unified technical base:

Defined torque versions matched to your standard blackout, dim-out or screen fabrics.
Customized adapters to plug into your existing 32 mm aluminum tube architectures.
Optional fascia, side channels and light-block components for stricter blackout requirements.
Documentation for testing, assembly, and classroom-level maintenance of Spring Loaded blinds.

With one Spring Loaded core, you can build complete classroom cordless roller blind families for different education segments and regions.

FAQ — Spring Loaded Classroom Blackout Blinds

Q1: What does “Spring Loaded” mean in this classroom mechanism?

“Spring Loaded” means that a constant-force spring inside the aluminum tube balances the blind’s
weight. Users pull the bottom bar to lower the blind and release to let it rise, without any chains or cords.
The spring controls speed and hover stability in a cordless roller blind system.

Q2: Can the Spring Loaded mechanism really replace chain-driven clutches?

Yes. The DOSRON Spring Loaded unit is an in-tube Cordless Roller Spring Mechanism that replaces
traditional chain clutches in many classroom cordless roller blind programs, especially where blackout
and safety are priorities.

Q3: How does the Spring Loaded design help with safety in schools?

Because the mechanism is fully inside the aluminum tube, not chains or loops. The Spring Loaded motion is tuned to move smoothly, eliminating entanglement hazards associated with hanging cords.

Q4: What information do you need to select the right Spring Loaded version?

For accurate selection, DOSRON typically needs blind fabric type, fabric weight per square meter, tube diameter,
blind width and drop. Using this data, we recommend a Spring Loaded torque range that gives
light operation and stable hover for your cordless roller blind line.

Field Insight — How Spring Loaded Blinds Improve Classroom Projects

In the field, the real difference is made by how easily the blinds are operated, whether they stay in place throughout the day, and how quickly and efficiently they are installed. The DOSRON Spring Loaded system addresses these classroom realities, providing a reliable solution for both teachers and students.

Enhanced Classroom Experience: The Spring Loaded design ensures a consistent user experience across multiple classrooms, with no tangled cords or chains. Teachers and students can operate the blinds with ease, making the space safer and more comfortable.
Increased Safety: By removing hanging cords and chains, the Spring Loaded mechanism ensures a safer environment for children and reduces the risk of accidents, such as entanglement or tripping hazards.
Lower Maintenance Costs: The robust Spring Loaded torque design significantly reduces drifting blinds and prevents common issues like snapping or jerking, resulting in fewer service calls and maintenance needs.
Faster Rollouts Across Projects: With a standardized Spring Loaded platform, installation teams can move quickly, making it easier to roll out the same solution across multiple classroom types and even large school districts.
Future-Proofing with Upgrade Options: As education environments evolve, the R32 Spring Loaded system provides an easy upgrade path. Facilities can switch from manual operation to motorized systems with minimal disruption, adding flexibility and future-proofing investments in infrastructure.

For educators and facilities managers, the DOSRON Spring Loaded platform offers a scalable, predictable solution that meets the varied demands of modern classrooms. From reduced operational complexity to increased safety and efficiency, this system ensures a better long-term investment for schools and educational institutions.

R38 Spring Loaded Mechanism for 38 mm Cordless Roller & Zebra Blinds

vc-admin — Thu, 16 Oct 2025 10:13:58 +0000

Quick Summary

The DOSRON R38 Spring Loaded Mechanism is an in-tube constant-force spring system for 38 mm cordless roller blinds and zebra blinds. Using 38RB springs for roller blinds and 38ZB springs for zebra fabrics, it balances heavier loads, delivers smooth cordless lifting, and supports both manual and motorized configurations for modern residential and commercial projects.

What Is the R38 Spring Loaded Mechanism?

The R38 Spring Loaded Mechanism is a high-capacity in-tube spring core designed for 38 mm aluminum tubes used in cordless roller blinds and zebra blinds. It sits fully inside the tube, behaving like a precision cap that stores and releases energy as the blind moves up and down. Instead of external chains and clutches, the R38 platform uses a constant-force spring to counterbalance the blind fabric and bottom rail weight.

For OEM brands, the R38 Spring Loaded Mechanism provides a unified 38 mm architecture that can serve both blackout roller blinds and dual-layer zebra blinds with minimal design changes. By choosing the correct spring variant, engineers can cover a wide range of blind sizes and fabric weights in one standardized system.

R38 Platform Structure and Component Stack

Every R38 Spring Loaded Mechanism is built around a consistent component stack so production, purchasing and assembly remain simple:

Spring Box: The torque-defining core, available as 38RB or 38ZB with multiple specifications.
Brake Module: Controls speed and stabilizes motion to reduce bounce and overshoot.
Shaft / Drive End: Interfaces with the 38 mm aluminum tube and transmits torque.
Fixing Parts: Pin and Circlip to lock the mechanism inside the tube.

The Spring Box is the primary variable. All other parts follow the same geometry, which means OEM teams can adopt the R38 Spring Loaded Mechanism as a common platform and only adjust the internal spring length and torque range for different blind series.

Two Families Under the R38 Spring Loaded Mechanism

To match the very different loading patterns of roller blinds and zebra blinds, the R38 platform is split into two dedicated spring families that share one external appearance:

38RB – Roller Blind Spring (4 Specifications)

The 38RB series is tuned specifically for cordless roller blinds that use blackout, dim-out or light-filtering fabrics on 38 mm tubes. While the outer housing is identical to the zebra version, the internal spring length and torque curve are optimized for standard roller blind wrapping.

4 spring specifications to cover typical roller blind weight ranges.
Suitable for PVC, polyester, screen and textile roller blind fabrics.
Designed for projects that require wider spans and heavier bottom rails.
Delivers smooth lifting and stable hover at any operating height.

38ZB – Zebra Blind Spring (6 Specifications)

The 38ZB series serves zebra blinds (also known as Korean or dual-layer shades), which carry more fabric mass on the tube due to overlapping front and back layers. The outer shape of the 38ZB Spring Box is the same as 38RB, but the internal spring length and torque levels are adapted to dual-layer loading.

6 spring specifications to handle different zebra fabric weights and widths.
Calibrated for dual-layer wrap and higher tube accumulation.
Supports precise alignment of front and back stripes with stable hovering.
Maintains a balanced “feel” from fully raised to fully lowered positions.

How the R38 Spring Loaded Mechanism Works Inside the Tube

In a typical assembly, the R38 Spring Loaded Mechanism is inserted into the right side of a 38 mm aluminum tube. The blind fabric edge is locked into the tube groove and wrapped around the tube surface. When the user pulls the bottom rail down, the tube rotates and the spring inside the R38 module is wound tighter, storing energy.

When the user releases the bottom rail, the spring unwinds. Because it is a constant-force design, the lifting force stays relatively stable across the full stroke, which is important for cordless roller blinds and zebra blinds using heavier fabrics. This is what gives the R38 platform its smooth, predictable motion and stable hover.

Right Side vs. Left Side Configuration

The R38 Spring Loaded Mechanism always occupies one end of the tube. The opposite end can be configured in two main ways:

Idler Option: A simple idler or idle shaft on the left side for fully manual cordless operation.
DOSRON Tubular Motor: A DOSRON tubular motor on the left side for hybrid manual + motorized control.

This structure allows manufacturers to use the same 38 mm tube and R38 spring architecture to build both manual cordless blinds and motor-ready product lines without redesigning the mechanical core.

R38 Spring Loaded Mechanism in Cordless Roller Blind Programs

When paired with 38RB Spring Boxes, the R38 Spring Loaded Mechanism becomes a powerful platform for cordless roller blind programs. The four torque levels let OEM brands match different blackout and dim-out fabrics by weight per square meter, cover common width ranges while maintaining comfortable pull forces, and deliver consistent handling across standard and premium lines.

From an engineering perspective, the R38 design simplifies SKUs. Purchasing teams can stock one 38 mm tube family, one set of brackets, and a clear mapping from blind size and fabric to the correct 38RB Spring Box code.

R38 Spring Loaded Mechanism in Zebra Blind Programs

Zebra blinds place more stress on the tube because the fabric is double-wrapped and must stay precisely aligned. The 38ZB variant of the R38 Spring Loaded Mechanism solves this by offering six calibrated torque levels tailored to typical zebra fabric constructions. With the right 38ZB specification, the blind can hover steadily at intermediate positions, and stripe alignment remains visually stable, which is important for residential design, retail fronts, and hospitality projects where zebra blinds are part of the aesthetic.

Key Benefits of the R38 Spring Loaded Mechanism

Unified 38 mm platform: One mechanical base for both roller and zebra blinds.
Cordless safety: No visible chains or cords at the user interface.
High torque capacity: Handles wider widths and heavier fabrics reliably.
Quiet operation: Internal bushings and guides reduce operational noise.
Simple upgrade path: Easy migration from manual to motorized using the same tube architecture.

Installation and Adjustment Overview

The R38 Spring Loaded Mechanism is designed so installers can work quickly while achieving stable final performance:

Cut and prepare the 38 mm aluminum tube to the required width.
Lock the fabric edge into the tube groove and wrap the fabric evenly.
Insert the R38 Spring Loaded module into the right side of the tube.
Insert the idler or DOSRON tubular motor into the left side.
Mount the tube to the brackets and test lifting, hovering and full travel.
Add or reduce pre-tension if the blind does not hover at the desired positions.

Once tuned, the R38 platform offers repeatable behavior across a full series of cordless roller blinds and zebra blinds, reducing call-backs and site adjustments.

Field Insight — R38 Spring Loaded Mechanism in Real Projects

On paper, many systems can lift a 38 mm blind. In the field, the difference shows up in how consistently the blind behaves across hundreds of units, how quiet it feels in daily use, and how easily engineers can scale the design into full product ranges. This is where the R38 Spring Loaded Mechanism delivers its practical value.

One core, multiple lines: The same R38 architecture supports blackout roller blinds and zebra blinds with only the Spring Box specification changed.
Predictable selection: Clear 38RB and 38ZB torque levels help engineers choose the right specification based on fabric and size data.
Fewer SKUs, more coverage: A compact set of R38 Spring Boxes can cover a wide range of blind configurations.
Consistent user experience: End users feel similar lift forces and hover behavior across different rooms and blind types.
Built-in upgrade path: Sharing a 38 mm tube platform makes it easier to introduce hybrid spring + motor concepts later.

For brands planning long-term cordless blind strategies, standardizing on the R38 Spring Loaded Mechanism turns the 38 mm tube category into a stable, scalable and future-ready foundation for both roller and zebra programs.

R38 Spring Assisted Cordless Lift System for Roller Shades

vc-admin — Thu, 16 Oct 2025 10:13:45 +0000

Quick Summary

The Spring Assisted Cordless Lift System for roller shades, also known as the R38, is designed for effortless operation in cordless roller blinds. Compatible with 38mm diameter tubes, the R38 system consists of four key components: the Spring Box, Shaft, Brake, and Circlip/Pin for secure brake positioning. The core component, the Spring Box, is crafted from high-quality materials, featuring a 304 stainless steel spiral spring housed in a durable POM casing. This system ensures smooth, efficient, and child-safe operation of roller shades without the need for cords, making it perfect for both residential and commercial applications. With various spring box models, the system is adaptable to different curtain and rail weights.

Product Description

Spring Assisted Cordless Lift System for Roller Shades: The R38 Advantage

The R38 Spring Assisted Cordless Lift System is an innovative solution designed for roller shades, offering smooth, effortless lifting without the need for cumbersome cords. This system is compatible with roller shades that use 38mm diameter tubes, making it a versatile and reliable choice for a range of window treatments.

Key Features and Benefits

Cordless Operation for Enhanced Child Safety: The cordless operation eliminates the risks associated with traditional corded blinds, such as strangulation or entanglement. This feature has made the system especially popular for homes, daycare centers, schools, and offices, where child safety is a top concern.
Durability and Longevity: Built to last, the system includes a 301 stainless steel spring and a POM casing that ensure long-lasting performance and resistance to wear and tear.
Effortless Operation: The spring-assisted lift mechanism makes the operation of roller shades effortless. With minimal physical effort, the user can easily raise or lower the shades, making this system an excellent option for individuals with limited mobility or those who prefer ease of use.
Silent Operation: Unlike many other blind systems, the R38 system operates with minimal noise, ensuring a quiet and peaceful environment.
Versatile Compatibility: The R38 system is compatible with a wide range of roller shades, including blackout, sheer, and thermal roller shades, offering smooth and consistent performance across different fabrics and weights.
Modern Aesthetic: The sleek, modern design of the R38 system fits well into any décor. Its minimalist, clean appearance blends perfectly with contemporary and traditional interior designs.

Materials and Design

Spring Box

The Spring Box is the core component of the R38 system, housing the 301 stainless steel spiral spring that provides the necessary tension for the lift mechanism. The spring is precision-engineered to provide consistent performance while maintaining its strength over time. The POM casing surrounding the spring is a high-performance plastic known for its exceptional wear resistance and mechanical strength.

Shaft

Shaft 38SS 2+1

Shaft 38SL 5+1

The Shaft connects the spring box to the other components of the system and ensures that the force generated by the spring is effectively transferred to the roller shade. Made from durable materials, the shaft is designed to withstand high loads without bending or deforming, ensuring smooth operation.

Brake

The Brake component plays a crucial role in controlling the movement of the roller shade. It provides a smooth, controlled descent of the shade, ensuring that it doesn’t fall too quickly. The brake’s design is such that it allows the shade to be lowered at a steady, controlled rate, enhancing both safety and functionality.

Circlip and Pin

Circlip

The Circlip and Pin secure the spring box and brake components in place, ensuring that the system operates as intended without the risk of components loosening or coming apart. These small but essential components are made of corrosion-resistant metals, further enhancing the overall durability of the system.

Installation and Usage

Fabric/inch /cm	36	48	54	60	64	72	84	86	96	102	112	Top rebound force	Unit
Fabric/inch /cm	91.44	121.92	137.16	152.4	162.56	182.88	213.36	218.44	243.84	259.08	284.48
Spring mm
0.09192000	180	207	220	234	243	260	287	292	314	327	350	50	g
0.10192000	274	315	335	356	370	397	438	445	480	500		75	g
0.11192000	382	426	448	470	484	513	557	565	600			125	g
0.12192000	482	526	548	570	584	613	657	665	700			175	g

The R38 Spring Assisted Cordless Lift System is designed for quick and hassle-free installation. The system comes with easy-to-follow instructions, and no specialized tools are required for assembly. Whether you are a DIY enthusiast or a professional installer, the process is straightforward. The system is designed to fit securely into 38mm diameter tubes, with clear steps to mount the components.

Operating the R38 System

Once installed, the R38 system offers effortless lifting and lowering of the shades. Simply pull or release the bottom bar of the shade to raise or lower it. The spring-assisted design ensures that minimal physical effort is required, making the system suitable for all users, regardless of age or strength.

Maintenance and Care

The R38 Spring Assisted Cordless Lift System requires minimal maintenance. To keep the system functioning smoothly, it’s recommended to clean the components periodically with a soft cloth to remove any dust or debris. The spring and other internal parts are sealed within the spring box, preventing external elements from affecting its performance.

Advantages of the R38 System

Child-Safe: Eliminates the danger of cords, making it ideal for homes and facilities with young children.
Durable and Long-Lasting: Built with high-quality stainless steel and POM casing, ensuring long-term reliability.
Efficient and Quiet: Provides smooth and quiet operation, enhancing comfort in any environment.
Flexible and Versatile: Suitable for a wide range of roller shades and applications, from residential to commercial spaces.
Easy to Install and Use: Can be quickly installed and operated with minimal effort.

Frequently Asked Questions (FAQ)

1. How does the R38 system work?

The R38 system uses a spring-assisted mechanism to raise and lower roller shades without the need for cords. The spring box, made from durable stainless steel, provides the lifting force, while the brake ensures smooth and controlled movement.

2. Is the R38 system compatible with all roller shades?

The R38 system is designed to work with 38mm diameter tubes. It is compatible with most standard roller shades, including blackout, sheer, and thermal shades.

3. Can I install the R38 system myself?

Yes, the R38 system is designed for easy installation. Clear instructions are provided.

4. Is the R38 system child-safe?

Yes, the cordless operation eliminates any safety risks associated with traditional corded blinds, making the R38 system ideal for homes with young children.

Field Insight

The R38 Spring Assisted Cordless Lift System for roller shades is a true game-changer in window treatment solutions, offering unmatched benefits in terms of safety, durability, and ease of use. With its child-safe design, long-lasting materials, and effortless operation, this system is ideal for both residential and commercial settings. Here’s a final look at the core advantages:

Enhanced Child Safety: The cordless operation eliminates the dangers of traditional corded systems, making it a perfect choice for homes, schools, and daycare centers where child safety is a priority.
Durability and Longevity: Built with corrosion-resistant materials like 304 stainless steel and a high-performance POM casing, the R38 system ensures reliable and smooth operation for many years.
Effortless Operation: The spring-assisted lift mechanism provides smooth, easy adjustment of roller shades, ensuring a user-friendly experience with minimal physical effort required.
Quiet and Smooth Functionality: The system operates with minimal noise, ensuring that users can adjust their shades without disrupting their environment, whether at home or in a professional setting.
Versatility: Whether for light sheer shades or heavy blackout ones, the R38 system is versatile enough to support a wide range of roller shades, making it suitable for diverse window treatments across various applications.
Modern Aesthetic: The sleek, cord-free design complements modern interior décor, providing a clean, minimalist look that enhances any space.

With all these features, the R38 Spring Assisted Cordless Lift System not only offers top-tier functionality but also aligns with modern safety standards, environmental concerns, and aesthetic preferences. It’s the perfect addition to any window treatment setup, ensuring both convenience and peace of mind.

Dual-Mode Motorization Kit for Cordless Spring-Lift Roller Blinds

vc-admin — Thu, 16 Oct 2025 10:14:02 +0000

Quick Summary

The DOSRON Dual-Mode Motorization Kit for Cordless Spring-Lift Roller Blinds combines a
constant-force spring-lift core and a tubular motor inside the same roller tube.
Fabric is fixed to the aluminum tube and rolled up; the motor plugs into the left side, the spring plugs into the
right side like two wine stoppers, leaving only slim end caps visible.

In daily use, end users enjoy cordless manual lift—just touch the bottom rail to raise or lower the blind.
When needed, the integrated Motorization Kit takes over, driving the tube automatically via remote or smart
controls, while the spring shares the load to keep movement smooth and quiet.

For OEM manufacturers and brand owners, this platform turns classic cordless spring-lift blinds into a
smart-home ready, dual-mode system without changing the visual language of a clean, cord-free blind.

1. System Overview – Inside the Dual-Mode Motorization Kit

The Dual-Mode Motorization Kit is designed specifically for cordless spring-lift roller blinds. Instead of choosing between a purely manual spring system or a purely motorized blind, this kit integrates both into a single,in-tube architecture:

Left side: A compact battery tubular motor plugs into the tube like a cork, with only a narrow drive head exposed.
Right side: A DOSRON constant-force spring box plugs into the opposite end in the same way.
Middle: Fabric is bonded to the aluminum tube and rolled around it; no lift cords or bead chains are visible.

In manual mode, the spring balances the blind’s weight so the user can raise or lower it by hand, keeping the cordless blind feel. In motorized mode, the tubular motor drives the tube directly, while the spring still offsets the load, reducing torque demand and improving acoustic comfort.

The kit is available for two mainstream tube diameters — Ø32 mm and Ø38 mm — making it compatible with most roller blind systems already in use in global markets.

2. Materials & Core Components

2.1 In-Tube Battery Tubular Motor

At the heart of the Motorization Kit is a slim, low-voltage tubular motor from the DOSRON DT25 family, engineered
for quiet, controlled movement and long battery life. Typical models offer:

Battery capacity: 2,600 mAh or 5,200 mAh lithium battery packs for 6–9 months of normal use per charge.
Charging voltage: 5 V DC via USB-Type-C or dedicated adapter.
Rated power: around 5 W for energy-efficient daily operation.
Speed & torque: approx. 25–28 rpm and 0.4–0.7 Nm torque depending on model.
Protection class: IP20 for indoor blind applications, with operating temperature from 0–40 °C.

These parameters are based on the standard DT25B1/B2 product line, tested and validated for roller blind use.

2.2 Constant-Force Spring Box (Spring-Lift Core)

On the opposite side of the tube, the constant-force spring box delivers the classic DOSRON “zero-gravity” lift:

Spring strip: 301 stainless-steel constant-force spring wound into a compact coil.
Housing: Low-friction POM box, sealed to keep dust out and to stabilize the spring’s path.
Diameter families: R32 and R38 spring boxes, tuned to match Ø32 mm and Ø38 mm tubes.
Variants: Multiple spring strengths within each diameter to cover different fabric weights and bottom rails.

The spring box adds lift assistance and damping, helping the blind stay at any height with minimal bounce and without the“snapping” feel of traditional coil springs.

2.3 Aluminum Roller Tube & Mounting Hardware

The Motorization Kit is optimized around standard roller blind hardware:

Tube options: 6063-T5 aluminum tubes in Ø32 mm and Ø38 mm.
End-caps & adapters: Motor head, spring plug, and idle end caps designed to lock into OEM brackets.
Brackets: Metal or high-strength plastic brackets for wall, ceiling or frame mounting.
Bottom rail: Cordless bottom rail designed for manual lifting, with optional soft-touch or child-safe profile.

For OEMs, all these elements can be branded, color-matched, or customized while keeping the functional geometry consistent with DOSRON’s spring and motor modules.

2.4 Electronics, Remote & Smart Controls

The Motorization Kit connects to a range of DOSRON control options:

Handheld remote: Multi-channel remotes control up to 15 blinds, with dedicated UP / DOWN / STOP keys.
On-motor key: R1 or similar key for pairing, power on/off and limit setting during installation.
Gateways & apps: Optional Zigbee / Wi-Fi gateways integrate the blinds into smart-home ecosystems.
Solar or plug-in charger: USB-C or DC jack for periodic recharging of the in-tube battery.

3. Architecture & Durability – How the Kit Is Built

From the outside, a blind built on this kit looks like a clean, cordless roller blind: a slim headrail or exposed tube, a
flat fabric panel, and a bottom rail. All complexity is hidden inside the tube.

3.1 Plug-In Motor & Spring – “Two Wine Stoppers” Layout

The mechanical layout is intentionally simple:

Motor side (left): The tubular motor is inserted into the aluminum tube until its drive wheel engages the tube’s
inner profile. The motor’s body disappears into the tube; only the drive head and a slim collar remain visible at the end.
Spring side (right): The constant-force spring module is inserted like a second cork from the opposite end, with its
torque output shaft keyed into the tube.
Tube middle: Fabric is bonded to the tube and rolled around it, storing the blind panel and providing a clean
surface when raised.

Because both motor and spring are fully in-tube, the headrail retains a minimalist profile and the blind remains truly
cordless on the room side — no chains, no dangling cords, and no visible clutch.

3.2 Load Sharing & Quiet Operation

One of the biggest advantages of combining a spring-lift core with a tubular motor is load sharing:

The spring offsets a large portion of the fabric and bottom-rail weight.
The motor supplies the remaining torque needed to move the blind.
Because the motor never “fights” full weight alone, noise and stress are reduced.

This means:

Quieter blinds: Less strain on gears and bearings, fewer harsh starts and stops.
Longer motor life: Motors running under partial load stay cooler and last longer.
Smoother feel: When users choose manual lift, the spring provides that “easy, balanced” motion.

3.3 Durability & Life Cycle

The Motorization Kit inherits DOSRON’s design standards for cycle life:

Spring modules: Designed for high cycle counts under repeated lift-lower operations.
Motors: Built on proven DT25 hardware with consistent performance across thousands of cycles. :contentReference[oaicite:1]{index=1}
Housings & plastics: POM and engineering plastics selected for wear and impact resistance.

For OEM programs, DOSRON can provide cycle-life data and testing methods so you can integrate this kit into retailer or project-spec requirements.

4. Capacity & Use Scenarios – Where the Motorization Kit Fits

The Dual-Mode Motorization Kit is ideal wherever you need a blind that behaves like a modern cordless product, but also offers motorized convenience:

Bedrooms & nurseries: Smooth, quiet lift with no bead chain, plus remote control for early mornings or nap times.
Living rooms & media rooms: Large roller blinds operated from the sofa, with the option of manual adjustment.
Home offices: Frequent small adjustments via hand or remote to manage glare on screens.
Hospitality & serviced apartments: Simple, intuitive operation for guests—tap the bottom rail or press a button.
Light commercial: Conference rooms, small offices, and boutique spaces that need quiet, discreet blinds.

Because the kit supports both Ø32 mm and Ø38 mm tubes, OEMs can match it to a wide span of blind sizes, from lighter daylight fabrics to heavier blackout materials, without overcomplicating the hardware list.

5. System Layout – How the Motorization Kit Works from End to End

5.1 In-Tube Layout

From left to right, a typical blind built on this kit looks like this internally:

Left bracket & motor head: Supports the motor and provides drive connection to the tube.
Battery tubular motor: Housed fully inside the tube, with charging port either on the head or via pigtail cable.
Aluminum tube: Rotates as the motor drives or as the user lifts/lower manually.
Fabric panel: Bonded and rolled on the tube, forming the visible blind.
Constant-force spring box: Seated in the right end of the tube, pre-tensioned to match the blind load.
Right bracket: Receives the spring shaft and locks the assembly into the frame.
Bottom rail: User interface for manual lift — grasp and gently move up or down.

5.2 Control Logic – Manual First, Motor When Needed

The Dual-Mode Motorization Kit is designed so that manual cordless operation remains the default behaviour:

Users can always move the blind by touching the bottom rail, even if they ignore the remote.
The spring holds the blind in position when the user lets go, just like a traditional cordless spring-lift blind.
When the remote is used, the motor rotates the tube while the spring keeps the system balanced.

This approach keeps the system intuitive for anyone who walks into the room, while premium buyers still get the comfort of motorization and smart-home integration.

5.3 Safety Logic & Limits

Standard DOSRON motors support:

Top & bottom limit positions: Installer-set stops to protect fabric and hardware.
Optional “learning” positions: Intermediate preset points for favourite scenes (e.g., TV mode).
Overload protection: Stall detection to avoid damage when blocked. :contentReference[oaicite:2]{index=2}
Low-battery protection: Motor stops and alerts installers to recharge instead of running under unsafe voltage.

6. Engineering & Compliance – Designed for Cordless Safety

Global regulations increasingly push the industry towards cordless blinds, particularly in homes with children. The
Motorization Kit is engineered to help OEMs align with these expectations.

6.1 Cordless Architecture

Because lift cords and bead chains are completely removed from the user interface:

There are no exposed cord loops in the room.
The bottom rail is the only touch point, with a stable, two-hand friendly profile.
Operation is intuitive: push up, pull down, or use the remote.

This architecture supports compliance with mainstream child-safety standards that restrict hazardous cord loops in residential products.

6.2 Quiet Operation & Comfort

Acoustic comfort is a key differentiator in premium blinds. In this kit:

The constant-force spring smooths out torque spikes, reducing internal impact noise.
The motor runs under partial load, which typically means quieter operation than full-load systems.
Guided plastic housings and damping design minimize rattling in the headrail area.

6.3 Manufacturing Quality & Documentation

DOSRON can support OEM programs with:

Dimensional drawings of motor, spring boxes, and adapters.
Material specifications for springs, housings, tubes and plastics.
Test reports and internal validation data for motor and spring performance.
Assembly guides for factory lines and installation manuals for field teams.

7. Product Details & Configurations

7.1 Core Specification Table – 32 mm vs 38 mm Kit

Parameter	Ø32 mm Dual-Mode Kit	Ø38 mm Dual-Mode Kit
Tube Outer Diameter	Approx. 32 mm	Approx. 38 mm
Motor Platform	DT25 series for 32 mm tubes (0.4–0.7 Nm)	DT25 series for 38 mm tubes (0.4–0.7 Nm)
Battery Capacity Options	2,600 mAh / 5,200 mAh	2,600 mAh / 5,200 mAh
Spring Module Family	R32 constant-force spring boxes (multiple strengths)	R38 constant-force spring boxes (multiple strengths)
Typical Blind Types	Light-to-medium roller blinds, zebra blinds	Medium-to-heavier roller blinds, wider zebra blinds
Core Operation	Cordless manual lift + motorized control	Cordless manual lift + motorized control
Recommended Use	Bedrooms, home offices, smaller living room openings	Living rooms, hospitality, larger windows

7.2 Tubular Motor Technical Snapshot

The exact motor model used in the kit can be selected according to blind size and OEM preference. A simplified snapshot of the DT25 family looks like this:

Model	Battery (mAh)	Rated Speed (rpm)	Rated Torque (Nm)	Motor Length (mm)
DT25B1/28-32X	2,600	28	0.7	396
DT25B2/28-32X	5,200	28	0.7	461
DT25B1/25-32B	2,600	25	0.4	396
DT25B2/25-32B	5,200	25	0.4	461

Note: Additional models (for Ø38 mm tubes) follow the same logic; OEMs can select torque and battery according to their
blind program.

7.3 Configuration Comparison – Choosing the Right Kit

For OEMs building a portfolio, the Motorization Kit can be configured along three simple axes:

Tube diameter: Standardizing around Ø32 mm and Ø38 mm keeps tooling and components under control.
Torque & load: 0.4 Nm for lighter blinds, 0.7 Nm for heavier fabrics and wider spans.
Battery size: 2,600 mAh for typical residential, 5,200 mAh for heavier use or reduced charging frequency.

By combining these variants with different R32 / R38 spring boxes, you can cover a wide range of blind sizes without creating a complex SKU jungle.

7.4 Matching Accessories

To build a complete product range around the Motorization Kit, DOSRON can supply:

Wall / ceiling brackets matched to the motor and spring heads.
Decorative fascia or cassette systems to conceal the tube.
Bottom rails, side channels and hem bars for blackout or light-filtering projects.
Handheld remotes, wall switches, and smart-home gateways.
Solar panels and power adapters for charging support.

8. Installation & Commissioning Overview

8.1 Factory Assembly Flow

In the factory, the Motorization Kit fits cleanly into existing roller blind assembly lines:

Cut and prep the Ø32 mm or Ø38 mm aluminum tube to required size.
Bond the fabric to the tube and roll it to the correct initial position.
Insert the pre-tensioned spring box into the right end of the tube.
Insert the selected DT25 motor into the left end until fully seated.
Fit end caps, adapters and brackets as per hardware design.
Perform initial function check (manual lift and motorized drive).

8.2 On-Site Commissioning

Installers follow a straightforward process at the project site:

Mount brackets and snap in the roller blind assembly.
Use motor’s R1 key and the remote to power on and pair.
Set top and bottom limits with the blind at its physical end positions.
Optionally set one or two “favourite” intermediate positions.
Check manual lift behaviour — the spring should hold at any height with minimal drift.

Because the blind remains usable in manual mode even during commissioning, installers can fine-tune limits without stressing users or the hardware.

8.3 Maintenance & Service

Routine service focuses mostly on charging and occasional adjustment:

Recharge every 6–9 months under typical household use. :contentReference[oaicite:5]{index=5}
Inspect brackets and mounting points periodically in high-traffic spaces.
For load changes (e.g., fabric swap), installers can re-tension or replace the spring module.

9. OEM / ODM Support – Building Your Own Dual-Mode Range

The Motorization Kit is designed as an OEM platform, not just a single retail SKU. DOSRON can help blind manufacturers and brand owners turn this hardware into a full product range.

9.1 Engineering Support

Selection guidance for spring strengths vs tube size vs blind weight.
Torque and battery recommendations for different region usage patterns.
Bracket and headrail design support to fit local installation habits.
Assistance integrating the kit into existing manual or motorized product families.

9.2 Branding & Customization

Private-label packaging, printed manuals and QR-code installation videos.
Laser-etched or printed logos on bottom rails, brackets and cassettes.
Custom colour options on visible plastic parts and fascias.
Firmware tweaks for preferred speed, soft-start / soft-stop behaviour or preset logic (subject to project volume).

9.3 Typical Project Scenarios

Examples of how OEMs can deploy this Motorization Kit include:

A “good-better-best” range where dual-mode blinds sit between manual cordless and fully wired smart blinds.
A hospitality bundle offering in-room motorized roller blinds without running mains power to the window.
A retrofit-friendly solution for existing cordless spring-lift blinds by reusing tube sizes and brackets.

10. About DOSRON – Dual-Mode Motorization & Spring-Lift Specialist

DOSRON focuses on hardware platforms for modern blinds: constant-force spring systems, tubular motors, and integrated solutions like this Dual-Mode Motorization Kit. From spring boxes and shafts to remote controls and gateways, the goal is to give OEMs a modular toolbox for building safe, quiet, and smart blinds.

With dedicated production lines for springs and motors, DOSRON can maintain consistency from metal strip and POM granules all the way to finished blind hardware kits. For global customers, that translates into predictable quality and scalable supply.

11. Conclusion – Why This Motorization Kit Changes the Game

The Dual-Mode Motorization Kit for Cordless Spring-Lift Roller Blinds is more than a motor added to a blind. It is a complete mechanical and control architecture that:

Keeps the familiar, intuitive behaviour of cordless spring-lift blinds.
Adds the convenience and comfort of motorization on demand.
Protects the clean visual language of modern blinds with fully in-tube components.
Simplifies OEM hardware strategy via just two tube diameters and a rational spring / motor family.

For brands and fabricators, this is a practical way to step into smart blinds without abandoning proven cordless platforms.
For end users, it quietly blends manual and motorized control into one seamless experience.

12. FAQ

Q1: What exactly is “dual-mode” in this Motorization Kit?

“Dual-mode” means the blind can be operated both manually (via the spring-lift bottom rail) and
motorized (via remote or smart-home control). The same tube and hardware support both modes without exposed cords or chains.

Q2: If the battery is low, can I still move the blind?

Yes. The constant-force spring continues to provide manual lift function even if the motor battery is low. The motor will
stop when voltage falls below its threshold to protect the battery, but manual operation remains available.

Q3: Which tube diameters are compatible with this Motorization Kit?

The kit is designed around Ø32 mm and Ø38 mm aluminum tubes, which are common in roller blind manufacturing. Adapters and brackets can be customized for specific OEM profiles if needed.

Q4: Is this Motorization Kit suitable for all blind sizes?

The kit covers typical residential and light commercial blinds where 0.4–0.7 Nm tubular motors are appropriate. For very large or extremely heavy blinds, DOSRON can advise on whether this platform or a higher-torque solution is more suitable.

Q5: How often does the battery need to be charged?

Under normal residential use, a fully charged battery usually supports approximately 6–9 months of operation before
recharging is needed, depending on blind size and daily cycles.

Q6: Can this Motorization Kit integrate with smart-home systems?

Yes. With DOSRON gateways, the motor can be linked to Zigbee, Wi-Fi or other protocols, enabling control via mobile apps,voice assistants or automation routines while retaining manual spring-lift operation.

Field Insight

For many years, the blind industry treated cordless spring-lift and motorized blinds as two separate worlds. The Dual-Mode
Motorization Kit closes that gap. By putting a constant-force spring and a tubular motor into the same tube, DOSRON turns
a simple roller blind into a flexible platform that can adapt to different rooms, users and budgets.

What Makes This Motorization Kit Stand Out:

True cordless interface: No chains or cords on the room side; only a clean bottom rail.
Shared load, lower noise: The spring and motor work together, not against each other, improving comfort and life span.
Two tube diameters, broad coverage: Ø32 mm and Ø38 mm options serve most residential and light commercial needs.
OEM-friendly modularity: One platform can power multiple product lines, from basic to premium smart blinds.
Future-proof architecture: Manual use remains intuitive today, while motorization and smart-home integration prepare the product for tomorrow.

For OEMs and brands, the message is simple: instead of choosing between manual cordless blinds and fully motorized systems,you can now design around a single, dual-mode Motorization Kit that does both—quietly and efficiently.

38mm Spring Motor Roller Blinds Control System for Modern Interiors

vc-admin — Thu, 16 Oct 2025 10:14:13 +0000

Quick Summary

The 38mm Spring Motor Roller Blinds Control System brings smooth, quiet, and cordless operation to modern interiors. Engineered by DOSRON, the spring-assist core balances fabric weight for effortless lifting while a compact motor enables precise control and scenes. Using POM engineering plastic housings and a 301 stainless-steel spring, the system delivers durable, elegant performance for homes and commercial spaces.

Overview of the 38mm Spring Motor Roller Blinds Control System

Redefining the Core of Modern Roller Blind Systems

Every refined roller blind relies on a precise spring mechanism to stabilize torque and a low-noise drive to position the shade. DOSRON’s 38mm Spring Motor Roller Blinds Control System is purpose-built for roller blinds, zebra blinds, and other cordless window coverings.
The architecture removes dangling chains, replacing them with an internal spring torque system that holds at any height. The result is smooth, silent movement, enhanced user safety, and long service life—delivered in a compact, modular platform ready for OEM/ODM customization.

Application Scenarios for the 38mm Spring Motor System

The DOSRON 38mm Spring Motor Roller Blinds Control System is widely adopted across residential and commercial interiors where aesthetics, comfort, and safety matter.

Option 1: Home Applications

Bedrooms & Living Rooms: blackout or light-filtering fabrics with quiet, child-safe cordless design.
Kitchens & Bathrooms: POM + stainless-steel components resist humidity and daily cleaning.

Option 2: Office & Commercial Environments

Meeting Rooms: silent lift avoids distraction during calls and presentations.
Hotels & Public Facilities: consistent alignment, durable cycles, and easy maintenance.

Maintenance and Installation Guide

Installation

Insert the 38mm spring motor module into the roller blind tube/headrail.
Align and lock adapters in the headrail; verify bracket coaxiality.
Set pre-tension so the shade holds at mid-drop; pair with the cordless bottom rail.
Complete assembly and test up/stop/down to confirm smooth, quiet motion.

Maintenance Tips

Avoid corrosive environments; wipe guides and seals periodically.
Recheck pre-tension if fabric or bottom-rail mass changes.
No lubrication needed—POM surfaces are self-lubricating.
Use original DOSRON parts for peak performance and safety compliance.

Technical Specifications of DOSRON 38mm System

Roller & Zebra Blind Reference (38 mm Platform)
Part No	Tube Size /mm	Fabric Width /mm	Developed Length /mm	Hold-at-Position	Top Max Capacity/g	Bottom Rail Non-rebound/g
R38-A1	38	900	2300	Yes	800–830	60–70
R38-A2	38	1100	2300	Yes	950–980	80–100
R38-A3	38	1200	2300	Yes	1150–1180	130–150
R38-A4	38	1300	2300	Yes	1300–1330	180–200

Engineering Principle Behind the Spring Motor System

How the 38mm Spring Motor System Works

The spring mechanism stores and releases energy through a stainless-steel spiral spring, offsetting fabric mass for balanced motion.
Unlike purely torsion-driven designs, DOSRON’s guided spiral delivers linear torque and stable hover at any height. The POM housing reduces friction and vibration, enabling a true cordless experience—and when paired with a compact motor, you get precise, quiet automation without heavy power draw.

Advantages of the Cordless Spring-Assist Architecture

Energy-light: smaller motors, longer battery life, lower standby.
Cycle stability: torque consistency over 10,000+ operations.
Low maintenance: self-lubricating POM—no routine oiling.
Wide adaptability: works with roller and zebra headrails.

OEM / ODM Integration

DOSRON supports global brands with spring-tension calibration, headrail interface adaptation, modular tooling, and ISO-controlled mass production. Torque range, spring thickness, and rail geometry can be tuned to your fabric and process.

Key Benefits of DOSRON 38mm Spring Motor System

Improved Safety

The cordless design removes chains/cords, addressing child-safety requirements in major markets.

Cost Efficiency

Spring-assist reduces motor size and wiring complexity—cutting build cost while improving reliability.

Simplified Assembly

The modular 38 mm platform drops into standard tubes; installers finish setup in minutes.

Longevity and Reliability

All components undergo torque endurance and aging tests under ISO 9001; the stainless spring resists fatigue for long-term stability.

Product Testing & Quality Control

Lifecycle Testing

Each system is tested for over 10,000 lift/lower cycles; torque remains within ±5% for consistent hover.

Material Verification

POM: tensile/impact performance verified for headrail stability.
301 stainless spring: corrosion resistance and elastic retention validated for extended use.

International Certification

DOSRON’s production complies with:

GB/T 19001-2016 / ISO 9001:2015
GB/T 24001-2016 / ISO 14001:2015
ANSI/WCMA A100.1 child-safety guidance (cordless design)

Why Choose DOSRON 38mm Spring Motor System

Core Advantages of the Cordless Design

1. Cordless & Child-Safe Operation

Eliminates chains and loops, mitigating entanglement risk and aligning with U.S./EU child-safety expectations.

2. Smooth & Silent Performance

Optimized spring-torque control + guided friction keep sound levels low—ideal for bedrooms and meeting rooms.

3. Long Life Cycle & Stable Torque

301 stainless spiral maintains torque within ±5% across years of use, ensuring reliable hover and clean stops.

4. Precision Materials

POM engineering plastic housing for dimensional stability and low friction.
301 stainless steel spring for corrosion resistance and elastic retention.

5. Customization Flexibility

Tailor spring tension, interfaces, and rails for different fabrics, widths, and regional specs.

Field Insight

Why the DOSRON 38mm Spring Motor Roller Blinds Control System leads:

Cordless child-safe design for modern interiors.
POM + 301 stainless construction for long-term reliability.
Quiet, premium motion suited to high-end spaces.
10,000+ life-cycle verification with tight torque control.
OEM/ODM customization at scale.
Energy-light, maintenance-light architecture.
ISO-based quality with environmental compliance.

Whether you’re a manufacturer, distributor, or systems integrator, DOSRON’s 38mm platform delivers performance, safety, and lasting value.

FAQ — Everything About the 38mm System

Q1: Can this system fit most roller or zebra blinds?
Yes. The 38mm platform supports standard tubes and adapters; special interfaces can be customized.

Q2: What is the expected service life?
Validated for 10,000+ operations with stable torque output under normal use.

Q3: Is it suitable for commercial projects?
Absolutely. Offices and hospitality spaces benefit from quiet, low-maintenance performance.

Q4: What differentiates DOSRON’s solution?
Precision materials, ISO-controlled torque testing, and tuned spring-motor synergy for quieter motion.

Q5: How does it improve child safety?
The cordless architecture removes hanging chains entirely, reducing entanglement risks in family spaces.
“`

R32 New Arrival Cordless Spring Mechanism For Blinds

vc-admin — Thu, 16 Oct 2025 10:13:53 +0000

Quick Summary

The Cordless Spring Mechanism is the compact power core behind DOSRON’s new R32 system for roller shades and zebra blinds. Designed around a Ø32 mm architecture, it delivers smooth, hover-anywhere lifting, long service life, and quiet operation without exposed cords or external power.

Built from POM engineering plastic, zinc-alloy die castings, and a 301 stainless steel spiral spring, this cordless spring mechanism supports both roller blinds and zebra blinds in small to medium sizes. The result is a child-safe, pet-friendly shading solution that is easy to install, easy to operate, and optimized for OEM / ODM customization.

Overview of the Cordless Spring Mechanism

Redefining the Core of Modern Roller & Zebra Blind Systems

Every modern blind system depends on a precise spring mechanism that keeps the fabric balanced and easy to control. DOSRON’s R32 New Arrival Cordless Spring Mechanism For Blinds is engineered specifically for roller shades and zebra blinds, giving manufacturers a compact Ø32 solution that fits narrow recesses and slim cassettes.

The cordless spring mechanism replaces external bead chains with an internal torque system that automatically balances the blind at any position. Users simply pull the bottom rail: the fabric glides up or down, then hovers quietly where released. This design improves child and pet safety, simplifies installation, and extends product lifetime compared with traditional corded systems.

Application Scenarios for the Cordless Spring Mechanism

The DOSRON Cordless Spring Mechanism in Ø32 format is ideal for residential and light-commercial shading projects where appearance, safety, and daily reliability are equally important.

Option 1: Home Applications

Bedrooms & Living Rooms: cordless operation keeps spaces clean and safe for children and pets while ensuring smooth, low-noise lifting.
Kitchens & Bathrooms: POM housing and stainless-steel components resist humidity and corrosion in high-moisture environments.

Option 2: Office & Light-Commercial Spaces

Offices & Meeting Rooms: quiet motion and stable hover reduce distraction during presentations and daily work.
Shops, Hotels & Public Areas: consistent alignment and long cycle life support intensive daily operation with minimal maintenance.

Maintenance and Installation Guide

Installation

Match the R32 cordless spring mechanism with the correct Ø32 tube and fabric weight according to the parameter table.
Insert the spring mechanism into the roller tube or zebra blind tube and fix the opposite idle end plug.
Mount the brackets inside the recess or cassette, then snap the tube-and-spring assembly into place.
Pull the blind fully down and up several times to verify smooth running and hover performance. Fine-tune pre-tension if needed.

Maintenance Tips

Avoid prolonged exposure to corrosive air or water spray on metal components.
Check the hover position periodically for extra-wide fabrics and adjust spring turns if the rail slowly drifts.
No lubrication is required — the POM housing provides self-lubricating guidance for the spiral spring.
Replace only with DOSRON R32 or approved spring cartridges to keep torque and safety performance consistent.

Technical Specifications of DOSRON Spring Mechanism

The R32 New Arrival Cordless Spring Mechanism For Blinds is a semi-automatic cordless spring mechanism designed for manual operation with Ø32 mm tubes. It uses a POM housing with zinc-alloy die castings and a 301 stainless steel spiral spring to generate stable torque for light to medium-weight roller shades and zebra blinds. The mechanism is built for built-in installation on inside mounts or cassette systems, and can be tailored via OEM / ODM torque tuning, adapters, and color options. All systems are designed and manufactured in Xiamen, China.

Ø32 Pipe System Parameters

Ø32 pipe system parameters
Series	Spring Model	Maximum Tension	Itinerary Reference
Roller Blinds C Series	32LB-07-250	250	96″-2400mm
	32LB-08-300	300	84″-2130mm
	32LB-09-400	400	72″-1830mm
	32LB-10-500	500	64″-1620mm
	32LB-11-600	600	54″-1370mm
Zebra Blinds D Series	32ZB-07-350	250	84″-2130mm
	32ZB-08-350	350	72″-1830mm
	32ZB-09-400	400	64″-1620mm

Engineering Principle Behind the Spring Mechanism

How the Cordless Spring Mechanism Works

The cordless spring mechanism relies on a controlled energy storage and release system driven by a stainless-steel spiral spring. When users pull the bottom rail of the roller shade or zebra blind, the spiral spring coils and uncoils to offset the weight of the fabric, creating a stable balancing force.

Unlike basic torsion springs that can lose tension quickly, DOSRON’s spiral geometry delivers a predictable torque curve across the full stroke. This allows the blind to stop at any point without drifting down or snapping up. The POM housing guides the spring and shaft with low friction, suppressing vibration and ensuring quiet, smooth movement over thousands of cycles.

Advantages of Mechanical Cordless System

Energy-Free Operation: no motors, batteries, or wiring — the cordless spring mechanism is 100% mechanical.
Stable Over Time: spiral spring and matched tube diameter maintain torque across 10,000+ cycles under normal use.
Low Maintenance: self-lubricating POM surfaces eliminate the need for grease in indoor environments.
Universal Adaptability: modular end caps and adapters support both roller and zebra blind headrails.

OEM / ODM Integration

DOSRON provides engineering customization services for global roller shade and zebra blind manufacturers, with deep expertise in cordless spring mechanisms.

Customized torque calibration matched to fabric weight, tube length, and bottom rail style.
Interface adaptation for different Ø32 tube profiles and cassette systems.
Modular housing mold development to align with your design language and production tooling.
Mass production under ISO-controlled assembly and 100% functional torque testing.

Each R32 spiral spring cartridge can be configured for specific torque ranges, fabric densities, and panel sizes so it drops into your existing blind families with minimal redesign.

Key Benefits of DOSRON Cordless Spring Mechanism

(Image placeholders – e.g. icons or lifestyle photos showing safety, smooth operation, durability.)

Improved Safety

The cordless spring mechanism eliminates external cords and bead chains, sharply reducing entanglement risks for children and pets. This design aligns with the latest U.S. and EU child-safety expectations for residential blinds.

Cost Efficiency

Compared with motorized systems, the fully mechanical R32 platform requires no battery pack, no charger, and no electronic controller. Hardware and assembly costs stay low while still delivering premium end-user experience.

Simplified Assembly

The modular design of the R32 spring cartridge allows installers to complete mounting in minutes: insert spring into the Ø32 tube, clip in the idle end, and snap the tube into brackets. This reduces labor, training complexity, and field errors.

Longevity and Reliability

All R32 components go through torque endurance testing and aging evaluations under ISO 9001 quality management. The 301 stainless-steel spring resists fatigue and corrosion, delivering stable torque output over years of daily operation.

Product Testing & Quality Control

(Image placeholders – life-cycle testing rigs, torque test benches, and inspection scenes.)

Lifecycle Testing

Each DOSRON cordless spring mechanism is tested for over 10,000 lift / lower cycles. Torque drift remains within a narrow window to ensure that hover performance and user feel stay consistent as the blind ages.

Material Verification

POM Plastic: evaluated for dimensional stability, impact strength, and wear resistance.
301 Stainless Steel Spiral Spring: tuned for elasticity retention and corrosion resistance in indoor environments.

International Certification

(Image placeholder – ISO and product certificates.)

GB/T 19001-2016 / ISO 9001:2015 Quality Management
GB/T 24001-2016 / ISO 14001:2015 Environmental Management
Support for customer-specific safety and performance certifications upon request

Why Choose DOSRON Spring Mechanism

Core Advantages of the Cordless Design

1. Cordless Spring Mechanism & Child-Safe Operation

The Cordless Spring Mechanism removes dangling cords and bead chains completely, supporting safer environments for homes, schools, and hospitality projects focused on family guests.

2. Smooth & Silent Performance

The optimized torque curve of the R32 cordless spring mechanism ensures smooth, low-noise movement that feels premium even on budget-conscious blind programs.

3. Long Life Cycle & Stable Torque

The stainless-steel spiral spring and matched POM housing maintain torque stability across repeated daily use, minimizing service calls and warranty claims.

4. Precision Materials

POM engineering plastic housing offers dimensional stability, low friction, and impact resistance.
301 stainless steel spring provides strong fatigue resistance and elastic recovery under continuous loading.

5. Customization Flexibility

DOSRON can customize torque levels, adapters, and colors so that the R32 system integrates seamlessly into existing roller shade and zebra blind lines without changing your visible design.

Field Insight

Why the DOSRON Cordless Spring Mechanism Leads the Market

True cordless design enhances child and pet safety while simplifying compliance work.
Durable POM housing and 301 stainless-steel spiral spring deliver long-term reliability.
Smooth, quiet motion upgrades the perceived value of roller shades and zebra blinds.
10,000+ cycle testing with controlled torque drift supports demanding OEM programs.
Flexible OEM / ODM services adapt the cordless spring mechanism to different tubes and headrails.
Energy-free, maintenance-friendly mechanical architecture reduces lifetime system costs.

Whether you are a blind manufacturer, wholesaler, or smart-home brand, DOSRON’s R32 New Arrival Cordless Spring Mechanism For Blinds offers a robust path to safer, quieter, and more competitive product lines.

FAQ — Everything About the Cordless Spring Mechanism

Q1: Are you a factory or a trading company?
We are the factory for motorized tubular motors and manual cordless spring components for roller shades, zebra blinds, cellular shades, Shangri-La blinds, and more.

Q2: How do you guarantee quality?
We implement strict quality control at every stage: IQC (Incoming Quality Control), PQC (Processing Quality Control), and OQC (Outgoing Quality Control).

Q3: Why should we buy from DOSRON instead of other suppliers?
Our R&D team continuously updates and iterates products to give customers unique market competitiveness. We have developed an integrated motorized + manual cordless roller shade system with a U.S. patent, and our products can be certified according to market needs. We also cooperate with many famous overseas brands such as DRAPER, ALDI, TARGET, Walmart, and NATIONAL GEOGRAPHIC, giving us rich experience in meeting strict quality requirements.

Q4: What shipping methods are available?
We can ship by sea, air, train, or truck. Common options include DHL, FedEx, UPS, door-to-door, DDU, and DDP services.

Q5: What kind of payment do you accept?
We accept T/T, L/C, Credit Card, MoneyGram, PayPal, Western Union, and other common methods.

Q6: How can I get samples?
We provide OEM and ODM services. You can share your detailed requirements with us, and we will prepare customized samples of the cordless spring mechanism for your testing.

38mm Quiet Smooth Cordless Spring Mechanism for Roller Blinds

vc-admin — Thu, 16 Oct 2025 10:14:08 +0000

Quick Summary

The DOSRON 38mm Quiet Smooth Cordless Spring Mechanism is engineered for office and commercial spaces demanding durability and silence. Made from high-strength aluminum with a precision-balanced spring mechanism, it delivers smooth lifting, stable torque, and low-noise performance — ensuring long-term reliability and a refined user experience.

Product Overview

Enhance your space with the DOSRON 38mm Quiet Smooth Cordless Spring Mechanism, designed for modern roller blind systems that prioritize safety, simplicity, and silence.
Its precision-engineered spring core ensures balanced torque and stable lifting, while the cordless structure complies with child safety standards and delivers effortless, quiet motion — ideal for both residential and commercial interiors.

Technical Specifications

Series	Spring Model	Maximum Tension	Itinerary Reference
Roller Blinds A Series	38RB-09-350	350	112″-2800mm
	38RB-10-500	500	102″-2600mm
	38RB-11-600	600	96″-2400mm
	38RB-12-700	700	96″-2400mm
Zebra Blinds B Series	38ZB-07-350	250	96″-2400mm
	38ZB-08-350	350	84″-2130mm
	38ZB-09-400	400	72″-1830mm
	38ZB-10-450	450	64″-1620mm
	38ZB-11-550	550	60″-1524mm
	38ZB-12-700	700	54″-1370mm

Each model is calibrated for torque consistency and optimized for specific fabric weights and window dimensions. All 38mm spring systems are tested for over 10,000 lift cycles to ensure smooth performance, durability, and precision stability.

Key Advantages & Features

Stable Torque Performance

Consistent tension output across different models ensures smooth, balanced operation with no sudden rebound or drag.

Whisper-Quiet Design

Low-friction polymer bearings and vibration-dampened structure keep operation noise below 40dB — suitable for quiet office and home use.

Durable Construction

The 301 stainless steel spring and POM housing provide excellent wear resistance and dimensional stability, guaranteeing long-term reliability.

Easy Installation

Compact 38mm modular design fits multiple blind types and minimizes assembly time for OEM and installers.

Maintenance and Installation Guide

Precision Spring Core

The spiral spring is fine-tuned for constant torque, allowing the blind to stay at any height without slipping or bouncing.

Friction-Optimized Housing

Engineered POM polymer casing reduces resistance during rotation and protects internal components from dust and deformation.

Silent Braking Control

The self-balancing damping mechanism absorbs start/stop impacts to ensure gentle, smooth operation.

Aluminum End Caps

Lightweight but rigid, anodized aluminum caps enhance structure stability and ensure perfect fit with roller tubes.

Durability & Safety Protections

Cycle Testing: Validated for over 10,000 operations under full load.
Thermal Stability: Materials tested to maintain elasticity from 0–40°C.
Safety Compliance: Cordless design conforms to CPSC 16 CFR 1260 and EN 13120 standards.
Corrosion Resistance: All metallic parts pass salt-spray testing to ensure longevity.

Applications

Roller Blinds
Zebra / Sheer Blinds
Honeycomb Blinds
Roman / Shangri-La Shades
Residential and Office Installations
OEM / ODM Blind Systems

OEM & ODM Services

DOSRON provides full OEM/ODM support including:

Private labeling and logo customization
Custom torque range and spring ratio design
Compatibility adjustments for various blind tubes
Engineering training and technical documentation

Field Performance Feedback

Field Insight: How DOSRON Redefines Quiet Precision in Cordless Spring Systems

The DOSRON 38mm Cordless Spring Mechanism represents a new standard in silent and stable window shade technology — integrating precision-engineered torque balance and noise-reduction mechanics for seamless operation.

Each system undergoes strict torque calibration and 10,000+ cycle testing to ensure every lift feels consistent, reliable, and quiet.
Built for modern architecture and child-safe environments, the design combines mechanical innovation with aesthetic minimalism.

Designed and assembled in Xiamen, China, each DOSRON system embodies our belief:
“Smart motion begins with precision — and endures with silence.”

FAQ

Q1: What is the MOQ?
Minimum order quantity is 100 pcs for standard models. Samples available for testing.

Q2: What is the warranty period?
All DOSRON spring mechanisms include a 5-year warranty for non-human defects.

Q3: Do you offer customization?
Yes. We provide OEM/ODM services including torque tuning, branding, and structure redesign.

Q4: What’s the average delivery time?
Production lead time is typically 20–25 working days for orders under 1,000 units.

Q5: How do I choose the right model?
Send your tube size, fabric weight, and desired lifting strength, and our engineers will recommend the most suitable spring model.

Customized Spring Loaded Motor Components For Cordless Shades

vc-admin — Thu, 16 Oct 2025 10:14:35 +0000

We are a manufacturer of manual roller blinds lifting system, we can accept different aluminum tube sizes to customize the system, you can get cheap and high quality roller blinds spring components at wholesale price from us with after-sale guarantee. A curtain system that installers like very much because it is easy to install and saves them a lot of time. This Cordless Spring Roller Shade Lifting System is suitable for all kinds of roller shades, zebra shades, Shangri-La shades.

Product Features:

1. Small and compact, space-saving.

2. Stable performance and long service life.

3. Wireless control ensures the safety of kids and pets during operation.

4. The device has an autonomous hovering function, which can keep it stable in any position chosen by the user.

5. Smooth feel during operation avoids any kickback or sliding problems.

6. Designed to achieve energy efficiency, it meets environmental standards and has a very low noise level during use.

Specification:

Product name	Cordless Manual Spring Roller Blinds
Material	POM+zinc alloy die-castings+301 stainless steel spring
Size	32mm
Installation Type	Built-in
Style	semi auto spring roller blind
Customized Service	Yes
Place of origin	Xiamen, China
Applicable curtain	roller shades, blinds, zebra blinds, honeycomb blinds, etc

Ø32pipe system parameters
Series	Spring Model	Maximum Tension	Itinerary reference
Roller Blinds C Series	32LB-07-250	250	96″-2400mm
	32LB-08-300	300	84″-2130mm
	32LB-09-400	400	72″-1830mm
	32LB-10-500	500	64″-1620mm
	32LB-11-600	600	54″-1370mm
Zebra Blinds D Series	32ZB-07-350	250	84″-2130mm
	32ZB-08-350	350	72″-1830mm
	32ZB-09-400	400	64″-1620mm

Company Profile:

Xiamen Dosron Technology Co., Ltd was founded in 2014, is located in the beautiful coastal city of Xiamen. It is a high-tech enterprise specializing in the research, development, manufacturing and sales of intelligent motors and control systems for windows. We have a team of 126 professionals dedicated to providing customers with innovative, efficient and reliable intelligent curtain lifting system solutions. Our main products include roller blinds motorized motor, cordless springs roller shades system, intelligent control switches and remote controls. These products, with their intelligent and IoT characteristics, meet the pursuit of convenience, safety and comfort in modern homes. Through continuous technological innovation and R&D investment, our products have been widely used in smart homes, commercial buildings and public facilities. Xiamen Dosron Technology Co., Ltd. has a wide range of customers, including curtain manufacturers, wholesalers and smart home brands. Our products and solutions have won recognition in domestic and foreign markets, and have established solid cooperative relationships with many well-known companies, including DRAPER, ALDI, Walmart, Target and National Geographic. We will promote the development of the smart home industry through continuous technological innovation and excellent customer service, and create a more intelligent and comfortable living experience for users. Friends from all walks of life are welcome to visit our company for guidance. We look forward to working with you to create a better future.

Certification:

FAQ:

1. Are you factory or trading company?

We are the factory of motorized tubular motor and manual cordless spring components for all kinds of roller shades, zebra blinds, cellular shades, Shangri-la blinds, etc.

2. How can you guarantee quality?

We have strict quality control for each step, IQC(Incoming Quality Control), PQC (Processing Quality Control) and OQC (Outcoming Quality Control).

3. Why should we buy from you not from other suppliers?

A. Our company has strong research and development capabilities, constantly updating and iterating our products to give our customers a unique market competitiveness in the market. We have developed a cordless roller shades system that is an integrated motorized and manual system and has received a U.S. Patent. This new product will help our customers to get more new customers and increase the repurchase rate of existing customers.

B. Our products can be certified according to the needs of customer’s market.

C. We have cooperated with many famous brands overseas, such as DRAPER, ALDI, TARGET, Walmart, NATIONAL GEOGRAPHIC. So we have the rich experience knowing how to make the products according to their strict quality request.

4. What kind of shipping way can you do?

We can deliver the goods by sea, air, train and truck. Normally are DHL, FedEx, UPS, door to door, DDU, DDP, etc.

5. What kind of payment do you accept?

We accept T/T, L/C, Credit Card, MoneyGram, PayPal, Western Union and so on.

6. How can I get samples?

We accept OEM and ODM services, you can discuss with us about your detailed requirements and we can make the sample for you accordingly.

R38 Customized Cordless Spring Systems for Zebra Blinds

vc-admin — Thu, 16 Oct 2025 10:14:21 +0000

Quick Summary

The DOSRON R38 Customized Cordless Spring Systems use a compact 38 mm cordless mechanism tailored for zebra fabrics. With POM engineering plastic guides and a 301 stainless-steel spiral spring, the system delivers stable torque, precise hovering, and low-noise motion. OEM/ODM options include customized torque curves, headrail interfaces, and mold variants—ideal for residential and light-commercial installations where stripe alignment and reliability matter.

Overview of the Cordless Spring Systems for Zebra Blinds

Redefining Smooth Control for Zebra Fabrics

The calibrated cordless spring mechanism balances fabric mass and tube inertia, achieving linear motion, crisp stop-points, and minimal drift. Lateral shift is reduced so zebra stripes remain parallel and visually clean.

Application Scenarios for the Cordless Zebra System

Option 1: Furniture application

Bedrooms & Living Rooms: quiet, cordless operation with precise hovering at any height.
Kitchens & Bathrooms: POM + stainless-steel components resist humidity and corrosion.

Option 2: Office & Light-Commercial

Meeting Rooms: low-noise lift avoids distraction; stripes stay aligned for clean visuals.
Hotels & Public Facilities: reliable balance and long service life for high-use areas.

Maintenance and Installation Guide

Installation

Insert the 38 mm spring mechanism into the headrail.
Align and lock end caps/adapters; ensure axial fit with the tube.
Mount the tube + fabric assembly; verify free rotation and even fabric tracking.
Test lift/hover/drop to confirm slip-free balance and stripe alignment.

Maintenance Tips

Avoid extreme humidity or corrosive vapors; keep the headrail interior clean.
Check balance periodically on wide/heavy zebra fabrics; re-tune as needed.
No lubrication required—POM surfaces provide self-lubrication.
Use DOSRON-certified components to maintain torque stability.

Technical Specifications of DOSRON Zebra Spring System

R38 Load-bearing Capacity of the R38 Zebra Blind Spring System

ITEM	Spring Spec.	Spring Force by Fabric Length										Top 40CM rebound force
ITEM	Spring Spec.	36″ (91.44)	36″ (91.44)	48″ (121.92)	54″ (137.16)	60″ (152.4)	64″ (162.56)	72″ (182.88)	84″ (213.36)	86″ (218.44)	96″ (243.84)	Top 40CM rebound force
1	0.07194000mm	154	175	200	213	225	234	251	276	280	301	50
2	0.08193500mm	212	236	264	279	293	303	322	350	—	—	75
3	0.09193500mm	272	300	333	350	367	378	400	—	—	—	100
4	0.10193500mm	331	362	400	418	437	449	—	—	—	—	125
5	0.11193000mm	436	470	509	529	549	—	—	—	—	—	175
6	0.12192600mm	570	616	671	698	—	—	—	—	—	—	225

Notes: Values are in g (grams). Fabric length refers to the single-layer length of the zebra blind. Select spring model and quantity according to the weight of the fabric and the bottom rail.

Engineering Principle Behind the Zebra Spring Mechanism

How the Cordless Spring Mechanism Works

A stainless-steel spiral spring stores/releases energy to offset fabric weight and tube inertia. Compared with generic torsion solutions, the spiral geometry provides linear torque with high stability, enabling hover-at-any-position and low-noise motion. The POM housing works as a precision guide, cutting friction and vibration for long-term consistency.

Advantages of the Mechanical Cordless System

Energy-free operation: no battery, wiring, or controller.
Stable over time: torque consistency maintained across 10,000+ cycles (typ.).
Low maintenance: self-lubricating POM surfaces; no grease required.
Universal adaptability: compact 38 mm module fits tight headrails and narrow recesses.

OEM / ODM Integration

DOSRON provides engineering customization for global zebra blind manufacturers.

Customized torque curves for specific fabrics/widths.
Interface adaptation for different headrails and mounting profiles.
Modular housing/mold options to meet regional design norms.
ISO-controlled assembly with outgoing torque checks.

Key Benefits of DOSRON Cordless Zebra Mechanism

Improved Safety

The cordless structure removes cords/bead chains, addressing modern child-safety expectations for residential spaces.

Cost Efficiency

A pure mechanical design means no battery, no wiring, no controller, cutting total system cost—effective for standardized SKUs.

Simplified Assembly

Modular design drops into common headrails; installers can complete integration quickly to reduce labor.

Longevity & Reliability

Torque endurance and material aging are checked under ISO routines. The 301 stainless spring resists fatigue for consistent balance over years of use.

Product Testing & Quality Control

Lifecycle Testing

Typical validation exceeds 10,000 lift/lower cycles with ±5% torque stability across travel.

Material Verification

POM housings tested for dimensional stability and impact strength.
301 stainless-steel spiral spring validated for elasticity retention and corrosion resistance.

International Certification

ISO 9001:2015 (quality) production routines
ISO 14001:2015 (environment) practice alignment

Why Choose DOSRON for Zebra Blinds

Core Advantages of the Cordless Design

1. Cordless & Child-Safe Operation

Eliminates hanging cords and bead chains, dramatically reducing entanglement risk in home and office scenarios.

2. Smooth & Silent Performance

An optimized torque-control spring ensures quiet, linear motion and clean stripe alignment.

3. Long Lifecycle & Stable Torque

Spiral spring architecture maintains torque within typical ±5% drift across validated cycles.

4. Precision Materials

POM housing for dimensional stability and wear resistance.
301 stainless-steel spring for fatigue and corrosion resistance.

5. Customization Flexibility

Torque, spring thickness, and interface options can be tuned to fabric weight and width targets—fully aligned with R38 Customized Manual Spring Systems specifications.

Field Insight

R38 Customized Cordless Spring Systems deliver cordless safety and premium stripe consistency.
POM + 301 stainless ensures long-term stability and low noise.
Consistent torque keeps stripes parallel and visuals premium.
10,000+ cycles typical endurance with reliable hovering.
OEM/ODM customization and ISO-based QC.
Energy-free mechanics with minimal maintenance.

FAQ — Everything About the Zebra Spring Mechanism

Q1: Will this 38 mm mechanism fit my zebra headrail?
Yes. The compact 38 mm module supports common headrail/tube formats and can be adapted for special profiles.

Q2: What is the expected service life?
Typical validation exceeds 10,000 cycles with stable torque and consistent hovering.

Q3: Can it be used in offices/hotels?
Absolutely. Low-noise operation and stable stripe alignment make it suitable for meeting rooms, hotels, and showrooms.

Q4: What makes it different from generic springs?
Calibrated spiral spring geometry, POM precision guides, and ISO-controlled QC deliver repeatable balance and low noise.

Q5: How does it support child safety?
The cordless design removes hanging cords/chains to minimize entanglement risks in residential settings.

R32/38 Series Cordless Spring Mechanism for Roller Blinds

vc-admin — Thu, 16 Oct 2025 10:11:03 +0000

Quick Summary

The R32/38 Series Cordless Spring Mechanism is engineered for roller blinds, available in Ø32 and Ø38 compact modules. It delivers hover-at-any-position, smooth/low-noise motion with no bounce or slide. The system is energy-free and child-safe, and supports OEM/ODM torque-curve tuning and headrail/interface adaptation.

Overview of the R Series Cordless Spring Mechanism for Roller Blinds (Ø32 & Ø38)

Redefining Smooth Control

The calibrated cordless spring balances fabric mass and tube inertia for linear motion, crisp stop-points, and zero drift. It eliminates bounce/slide during operation and maintains clean edges on roller blind fabrics.

Application Scenarios

Option 1: Residential

Bedrooms & Living Rooms: quiet, cordless operation with effortless hover at any height.
Kitchens & Bathrooms: compact structure fits narrow recesses; components selected for durability.

Option 2: Office & Light-Commercial

Meeting Rooms: low-noise lift avoids distraction; clean façade for presentations.
Hotels & Facilities: reliable balance and long service life in high-use environments.

Maintenance and Installation Guide

Installation

Insert the Ø32 / Ø38 spring module into the roller headrail/tube.
Align and lock end caps or adapters; verify axial fit.
Mount fabric assembly; check free rotation and even fabric tracking.
Test lift/hover/drop to confirm slip-free balance and alignment.

Maintenance Tips

Keep the headrail interior clean; avoid corrosive vapors.
On wide/heavy roller fabrics, verify balance periodically; re-tune if needed.
No lubrication required under normal indoor use.

Ø32 Pipe System Parameters — R Series (Roller Blinds)

Use the following Ø32 table for roller blind selection and quotation.

Series	Spring Model	Maximum Tension	Itinerary Reference
Roller Blinds C Series	32LB-07-250	250	96″–2400 mm
Roller Blinds C Series	32LB-08-300	300	84″–2130 mm
Roller Blinds C Series	32LB-09-400	400	72″–1830 mm
Roller Blinds C Series	32LB-10-500	500	64″–1620 mm
Roller Blinds C Series	32LB-11-600	600	54″–1370 mm

Notes: Final selection depends on fabric mass (g/m²), tube diameter, and bottom-rail weight.

Ø38 Pipe System Parameters — R Series (Roller Blinds)

Use the following Ø38 table as provided for roller blinds.

Series	Spring Model	Maximum Tension	Itinerary Reference
Roller Blinds A Series	38RB-09-350	350	112″–2800 mm
Roller Blinds A Series	38RB-10-500	500	102″–2600 mm
Roller Blinds A Series	38RB-11-600	600	96″–2400 mm
Roller Blinds A Series	38RB-12-700	700	96″–2400 mm

Notes: Match Maximum Tension & itinerary to fabric mass and bottom-rail data; add spring quantity if required.

Engineering Principle

How the Smart Cordless Spring Works

A variable-force spiral spring stores/releases energy to offset fabric weight and tube inertia. Compared with wire-type springs, the variable-force profile provides tunable torque across travel, enabling hover-at-any-position with low noise and reduced wear in roller blind applications.

Key Advantages for Roller Blinds

Safety & UX

Cordless, child-safe operation—no bead chains or hanging cords.
Smooth motion without bounce/slide; precise, repeatable hovering.

Efficiency & Reliability

Energy-free: no battery, wiring, or controller.
Compact: Ø32 & Ø38 modules fit tight roller headrails.
Designed for durability and minimal maintenance.

OEM / ODM Integration

Tuned torque curves for target roller fabric widths/masses.
Interface adaptation for different roller headrails and mounting profiles.
Modular housing/parts strategy for regional design norms.
Outgoing checks on torque stability and assembly accuracy.

Product Testing & Quality Control

Lifecycle & Stability

Validation focuses on repeated lift/lower cycles with tight torque stability across travel.

Component Verification

Spring characteristics verified for elasticity and fatigue resistance.
Housing and moving interfaces checked for dimensional stability and wear.

Why Choose DOSRON’s R Series for Roller Blinds

Core Advantages

1. Smart Cordless Operation

Removes chains/cords; hover-anywhere ease of use.

2. Smooth & Silent

Optimized torque curve minimizes noise and eliminates bounce/slide.

3. Long Service Life

Variable-force geometry and protected spring box reduce wear.

4. Compact Precision

Ø32 & Ø38 architectures fit narrow recess applications.

5. Customizable

Torque, interface, and module options for different roller fabrics and regions.

Field Insight

In live builds, Ø32 excels in narrow recess retrofits and light-to-medium fabrics, cutting install time thanks to smaller tubes.
Ø38 is the workhorse for wider/heavier shades, offering a larger torque envelope and more margin against drift on tall drops.
For consistent hand feel across a product line, many OEMs standardize bottom-rail mass and then tune the spring curve instead of altering hardware per SKU.
Most assembly issues trace to axial misfit or over-/under-tension. A quick mid-height hover test exposes both—if it creeps, add or remove pre-tension turns before final end-cap lock.
To minimize warranty returns, keep a simple selection rule on the shop floor: “choose by fabric mass + drop, then verify with a 30-second hover check.”

FAQ — R Series Smart Cordless Spring for Roller Blinds

Q1: Do Ø32 and Ø38 fit the same roller headrails?
They target different tube/headrail profiles; adapters are available for special profiles.

Q2: What user experience can I expect?
Smooth lift with no bounce or slide, plus hover-at-any-position stability.

Q3: Is it suitable for commercial roller applications?
Yes. Low-noise, durable balance, and compact structure suit offices, hotels, and public facilities.

Q4: How is it different from wire springs?
The variable-force profile offers tunable torque and better stability, improving longevity and reducing maintenance.

Q5: Does the system require power?
No. It is an energy-free mechanical solution—no battery, wiring, or controller.