cordless spring system – Cordless Curtain Solution Provider | Dosron

L11 Cordless Spring System for Honeycomb Shades

Gianna — Tue, 20 Jan 2026 05:54:26 +0000

Quick Summary

The L11 Cordless Spring System offers a seamless, smooth, and safe window covering solution by eliminating external cords. This system is designed to be highly functional for Honeycomb Shades, ensuring ease of use, tangle-free operation, and enhanced safety. This product is ideal for enhancing the aesthetics and functionality of modern homes and commercial spaces.

Product Overview

The L11 Cordless Spring System for Honeycomb Shades is designed to provide an efficient and clean solution for window coverings without the need for external cords, reducing the risks associated with tangled cords and improving ease of use. The system is engineered with a constant-force spring housed in a durable POM (Polyoxymethylene) material spring box. It is designed to be installed in a simple manner, requiring minimal tools and setup. This system ensures a quiet, smooth operation that users can depend on for years.

Key Features:

Cordless operation – eliminating external cords to improve safety and aesthetics.
Effortless operation with smooth, stable opening and closing, ensuring a premium user experience.
POM spring box housing ensures long-lasting durability and reliability under frequent use.
Compatible with Honeycomb Shades, especially those with up to 84″ vertical drop, making it versatile for different window sizes.
Minimalist design that seamlessly integrates into modern and traditional interiors, ensuring aesthetic appeal in any room.
Available in a range of spring thicknesses to meet different performance requirements and shade sizes.
Highly customizable to ensure precise installation and optimal functionality in any space.

Product Specifications

Component	Description
L11 Spring Box	Core component with constant-force spring, housed in POM material (126 x 29 x 23.3 mm) providing smooth operation.
1” Cord Base	For stable attachment and support on the Honeycomb Shade frame, providing enhanced support during operation.
Buckle	To secure excess cord length after installation and prevent tangling, contributing to the system’s tangle-free functionality.
Supported Shade Length	Up to 84″ vertical drop, suitable for a wide range of window sizes.
Spring Thickness Options	0.08, 0.09, 0.10, 0.11, 0.12, 0.13 mm options available for different shade weights and sizes.
Material	High-strength POM (Polyoxymethylene) for durability and smooth performance, resistant to wear and tear.
Spring Type	Constant-force spring ensures smooth, even lifting and lowering over time, with no loss of tension or performance.

Installation Instructions

The installation of the L11 Cordless Spring System is designed to be quick and straightforward.

Step 1: Begin by drilling two small holes in the top rail of your Honeycomb Shade to securely attach the L11 Spring Box.
Step 2: Position the L11 Spring Box in the center of the top rail, ensuring it is aligned properly. Use screws to fasten it in place through the drilled holes.
Step 3: Install the 1” Cord Base at each end of the top rail. Secure the cord base using screws through the provided larger square holes.
Step 4: Thread the cord through the fixed bases. Ensure the cord is aligned and secure, leaving approximately 20 cm of extra cord at the end to prevent slack.
Step 5: Use the provided Buckle to tie off the excess cord and keep it in place.
Step 6: Attach the bottom rail by threading it into the fabric and securing it. Ensure the rail is firmly in place to prevent movement during operation.
Step 7: Finally, gently pull the bottom rail to test the system. Ensure the shades open and close smoothly and without resistance.

Real-World Applications

The L11 Cordless Spring System is designed for residential, commercial, and industrial use. It’s particularly beneficial in settings where safety, smooth operation, and aesthetic value are priorities.

Homes and Apartments

In modern homes, especially those with young children or pets, the absence of cords is crucial for safety. The **L11 Cordless Spring System** provides a tangle-free and child-safe environment, while maintaining a sleek, modern aesthetic that complements any décor. Its smooth operation enhances the user experience, allowing homeowners to operate their Honeycomb Shades with minimal effort and maximum efficiency.

Commercial Settings

For offices, hotels, and other commercial spaces, the L11 system offers a professional solution that enhances both functionality and safety. The system is easy to install and operate, requiring minimal maintenance over its lifecycle. This makes it ideal for high-traffic areas where efficiency and durability are key considerations.

Child-Safe Zones

Child-safe zones in homes, daycare centers, schools, and hospitals require the highest safety standards. The **cordless design** of the L11 system ensures that there are no dangerous cords hanging down, significantly reducing the risk of accidents. Parents and caregivers can rest assured knowing that the system meets the most stringent safety regulations.

Benefits of the L11 Cordless Spring System

The L11 Cordless Spring System for Honeycomb Shades provides numerous advantages that set it apart from other window treatment systems:

Tangle-Free Operation: With no external cords, this system prevents tangling and provides smooth, effortless operation.
Child-Safe Design: The absence of cords makes it safer for homes with children, reducing the risk of entanglement and strangulation.
Smooth and Reliable Operation: The constant-force spring ensures the shades open and close smoothly, with no jerky movements or uneven lifting.
Easy Installation: The system is designed for quick installation with minimal tools, making it ideal for DIY enthusiasts and professional installers alike.
Long-Lasting Durability: The POM housing of the spring box provides robust protection, ensuring long-term use without wear or failure.
Increased Aesthetic Appeal: The clean, minimalist design enhances the appearance of any room, complementing both modern and traditional décor styles.
Improved Safety and Functionality: Whether used in residential, commercial, or child-safe zones, the L11 system offers a balanced blend of safety, performance, and aesthetics.

Field Insight

The L11 Cordless Spring System for Honeycomb Shades is more than just a window covering solution; it represents a modern, efficient, and safer way to operate your window treatments. With its seamless, **cord-free** operation, **child-safe** design, and smooth lift system, it offers unparalleled functionality. This product is perfect for anyone looking to enhance their living or working space with a premium window treatment system.

Key Takeaways:

The L11 system is a great solution for child-safe, tangle-free, and smooth operation.
The system is compatible with various Honeycomb Shades and designed for a wide range of window sizes.
Its minimalist design and durable build make it suitable for residential and commercial applications alike.

38ZB Cordless Spring System for Zebra Shades

Gianna — Fri, 12 Dec 2025 09:07:23 +0000

Quick Summary

The DOSRON Cordless Spring System built around the 38ZB spring box is the zebra-specific module in the R38 cordless spring mechanism. With a POM housing and 301 stainless-steel constant-force spring, it is mounted in series on a shaft together with a brake and fixed by circlips, then inserted into a Ø38 mm aluminum tube. Two shaft options support up to 2 or 5 spring boxes per blind, so OEM brands can tune lift force to the zebra fabric and bottom rail weight while keeping a clean, cordless appearance.

Cordless Spring System Overview for 38ZB Zebra Blinds

The 38ZB spring box is a dedicated in-tube spring module for cordless zebra blinds using 38 mm aluminum tubes.
It belongs to the R38 Cordless Spring System family, where 38RB modules are optimized for roller blinds and
38ZB modules are optimized for zebra (day & night) fabrics. Within this Cordless Spring System, each 38ZB module combines a low-friction POM outer shell with an internal 301 stainless-steel spiral spring that provides near constant lifting force across the stroke.

Internal Architecture: Shaft, Spring Boxes, Brake and Circlips

Shaft – the “bamboo skewer” core: A precision R38 shaft runs through the center, but with a mechanical profile rather than a bamboo look. It defines the positions for each 38ZB spring box and the brake inside the Cordless Spring System.
38ZB spring boxes – the “hawthorns” on the stick: One or more 38ZB modules are threaded onto the shaft in series. Each module adds lifting capacity in the Cordless Spring System, just like adding another hawthorn on the skewer.
Brake – the tail piece of the skewer: The Brake is central to the shade’s safe and graceful operation. It ensures the shade descends at a steady, elegant pace, preventing rapid falls and guaranteeing reliable performance.
Circlips – the invisible stoppers: Once the spring boxes and brake are positioned, circlips are locked into the shaft grooves above and below the stack, fixing the positions and preventing movement during operation.
Aluminum tube – the outer shell: The fully assembled spring set (shaft + 38ZB modules + brake + circlips) is then pushed into a Ø38 mm aluminum tube like a plug, creating a compact, sealed cordless lift core for zebra blinds within the Cordless Spring System.

There are two shaft versions in the R38 system: one designed to hold up to 2 pcs of 38ZB spring boxes, and one that can hold up to 5 pcs. The actual number of spring boxes used is selected according to the zebra fabric weight and bottom rail mass for each blind size.

Key Features & Benefits of the Cordless Spring System

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

Engineered for Zebra Fabrics

Zebra-specific tuning: The 38ZB module is calibrated for the layered double fabric and typical weight distribution of zebra blinds, improving balance and hold at any position within the Cordless Spring System.
Modular lift capacity: By combining 1–5 38ZB spring boxes on a single shaft, OEMs can cover a wide range of blind widths and drops without redesigning the mechanism.
Consistent feel: The constant-force 301 stainless-steel spring delivers nearly uniform lift force, so the blind feels similar at the first pull and at full extension.

Quiet, Cordless Spring System User Experience

No external cords or chains: The R38 38ZB Cordless Spring System supports fully cordless zebra blinds, reducing entanglement risks and eliminating bead-chain rattling.
Low-friction POM housing: The POM shell provides self-lubricating contact surfaces, reducing internal friction and helping to keep the lift motion smooth and quiet.
Brake and damping integration: The R38 brake and controlled spring release help avoid “snap-up” behavior.

OEM-Friendly Platform

Standardized R38 platform: Share the same shaft, brake and circlip logic between 38RB and 38ZB variants; only the spring box type changes between roller and zebra programs in the Cordless Spring System.
Inventory simplification: Two shaft types (2-spring and 5-spring) plus a defined set of 38ZB modules allow you to cover most zebra blind SKUs with fewer mechanism SKUs.
Ready for automation and volume: The sealed module design and clear assembly steps are suitable for high-volume production lines and automated pressing equipment.

Application Scenarios

Premium living rooms and bedrooms: Smooth, quiet Cordless Spring System zebra blinds that match modern interior design.
Nursery and family spaces: No exposed cords; compliant, child-friendly hardware when paired with suitable headrails and components.
Offices and hospitality: Unified R38 platform for large projects that require consistent operation across many windows.
Smart-ready programs: The same R38 mechanical core can be combined with suitable tubular motors in hybrid designs, sharing the load and improving motor life.

Installation & Fabrication Notes for Cordless Spring System Zebra Blind Manufacturers

Step 1 – Confirm tube and blind specs: Use Ø38 mm tubes and calculate total load (fabric + bottom rail) for the target zebra blind size.
Step 2 – Select shaft type: Choose the 2-spring shaft for lighter, smaller blinds or the 5-spring shaft for wider, heavier blinds or denser fabrics.
Step 3 – Decide the number of 38ZB modules: Based on load charts and your key SKUs, configure the shaft with the appropriate number of 38ZB spring boxes to balance the blind without over-pulling.
Step 4 – Assemble the spring pack: Thread the 38ZB modules onto the shaft “in series”, add the R38 brake at the tail, then lock their positions using the specified circlip grooves.
Step 5 – Insert into the tube: Push the assembled spring shaft into the aluminum tube like a plug, mount the corresponding end caps, and integrate into your zebra blind headrail.
Step 6 – Pre-tension and test: Apply the recommended number of pre-tension turns, cycle the blind several times, and fine-tune pre-tension to achieve stable stop at any height.

FAQ

Q1: Can the 38ZB Cordless Spring System be used for roller blinds?
A1: No. The 38ZB spring box in the Cordless Spring System is tuned for zebra (day & night) fabrics. For roller blinds, DOSRON provides the matching 38RB spring box within the same R38 platform.

Q2: How do I decide how many 38ZB spring boxes to use?
A2: Selection is based on zebra fabric weight, bottom rail mass and blind size. The R38 Cordless Spring System offers shafts for up to 2 or 5 spring boxes; your final configuration should follow DOSRON’s load chart and your key SKUs.

Q3: Is the Cordless Spring System child-safe?
A3: The R38 Cordless Spring System eliminates external lift cords and chains at the user interface, helping brands design child-safe cordless zebra blinds. Final compliance still depends on the complete blind design and local regulations.

Q4: Can DOSRON customize the Cordless Spring System for my zebra blind range?
A4: Yes. DOSRON can adjust spring specification, pre-tension range and shaft configuration within the Cordless Spring System to match your target fabric weights, sizes and market requirements for OEM/ODM projects.

Q5: Can I combine the Cordless Spring System with a tubular motor?
A5: The 38ZB Cordless Spring System can be used in hybrid spring + motor architectures, where the spring shares the lifting load with a tubular motor to reduce torque demand and improve motor life.

Q6: What maintenance does the 38ZB Cordless Spring System require?
A6: The 38ZB spring box is a sealed POM module and normally does not require lubrication in use. Routine checks should focus on the overall blind: tube connection, end caps, brackets and correct pre-tension settings.

Field Insight

Separating 38RB for roller blinds and 38ZB for zebra blinds allows OEM brands to keep one R38 Cordless Spring System while still tuning the spring behavior to different fabrics. The shaft with multiple 38ZB spring boxes, a brake at the end and circlips fixing every position gives engineers a clear, modular way to scale from small residential blinds to wider project windows without redesigning the core mechanism. For factories, this means fewer SKUs and faster assembly; for end users, it means a zebra blind that feels consistently smooth, quiet and safely cordless.

L4 Cordless Spring System for Faux Wood Venetian Blinds

vc-admin — Thu, 16 Oct 2025 10:13:27 +0000

Quick Summary

L4 Cordless Spring System

The L4 spring box is an in-headrail lifting core for Faux Wood Venetian Blinds. Built around a POM engineering housing and a 301 stainless-steel spiral spring, the module works with low-backlash polymer gears to deliver a cordless façade, smooth lifting, stable hold at any height, low noise, and low maintenance. It fits common steel/aluminum headrails, supports both ladder tape and cord ladder routing, and suits both residential and light-commercial roll-outs or retrofits.

Materials Inside the Cordless Spring System

POM Housing — The Cordless Spring System Backbone

High stiffness & dimensional stability keep gear center distance and shaft coaxiality under load, limiting torque loss.
Wear & aging resistance supports high-frequency daily use without brittle failure under typical indoor humidity/temperature swings.
Low-friction surfaces interact gently with tapes and guides for a smoother feel.
Injection-molding friendly design enables ribs, snaps, and hole patterns in a single shot for consistent mass production.

301 Stainless-Steel Spiral Spring — The Cordless Spring System Power Core

High elastic limit for a near-linear restoring force within rated travel—well matched to faux-wood slat loads.
Low relaxation & corrosion resistance for stable performance in indoor ambient moisture.
Fatigue-optimized winding and heat-treat strategy for longer cycle life and steadier torque delivery.

Polymer Gear Train — The Cordless Spring System Transmission

Optimized tooth geometry and module to suppress mesh noise and boost efficiency.
Reinforced hub design strengthens shaft bores and reduces long-term wobble risk.
Dry-film lubrication path tolerates dust and avoids oil re-application.

How the Cordless Spring System Works

Energy Storage & Release in a Cordless Spring System

Lowering: Slat weight turns the gear train; the spiral spring winds tighter and stores energy.
Raising: The spring releases energy through the reduction gears to drive the take-up shaft, offsetting gravity for easier lift.

Hold-At-Any-Height Principle in a Cordless Spring System

Within the rated load, spring torque plus guided friction create a stable balance so the blind holds at any height.
Fine-tune with pre-tension turns to achieve stable mid-span behavior and controlled limits at both extremes.

Path Consistency in a Cordless Spring System

Equal path length on both sides maintains left-right synchronization and holding stability.
Compatible with ladder tapes and cord ladders, allowing low-cost retrofits in existing headrail families.

Compatibility & Scenarios

Window Type & Headrail Fit

Window type: Faux Wood Venetian (PVC or composites), compatible with ladder tape or cord ladder.
Headrail: Common rectangular steel/aluminum headrails; internal bay supports sliding-in of the cartridge and multi-point screw fastening.

Rooms & Projects

Residential: Living rooms, bedrooms, studies, kids’ rooms.
Light commercial: Hotels, serviced apartments, conference rooms, model units.
Retrofits: Upgrading from corded to cordless for an immediate visual and safety boost.

Key Benefits

Cordless safety & clean look for modern interiors.
Stable torque curve from the 301 stainless spiral spring—predictable, repeatable performance.
Low-noise transmission via optimized polymer gears and material damping.
Rigid POM chassis to suppress twist/deflection and protect torque integrity.
Low maintenance with sealed cavity and dry-film lubrication.
Fast installation thanks to universal hole patterns and modular interfaces.
Batch consistency supported by torque-curve sampling and critical-gap checks.

L4 Cordless Spring System Specifications

No	Loading capacity	Spring spec.		Resistor inside	System	Cords
No	KG	Part Number	Spring Thickness	Resistor inside	Set	Cords
1	0-1.99	L4	0.12	1	1	2
2	2.0-2.49	L4	0.14	1	1	2
3	2.5-2.99	L4	0.13	1.5	1	2
4	3.0-3.49	L4	0.14	1.5	1	2
5	3.5-3.99	L4	0.15	2	1	2

Durability Strategy of the Cordless Spring System

Lifetime tuned for high-frequency daily use.
In-process torque-curve sampling, assembly-gap verification, and headrail fit validation.

Why Choose a Cordless Spring System

Safer, cleaner front view: No exposed loops on the window face—reduced entanglement risk and a tidier aesthetic.
Retail-friendly: Cordless design aligns with modern channel safety preferences, helping listings pass compliance checks.
Minimal maintenance: Fully mechanical, passive solution—no batteries, no motors, no controllers to service.
Predictable user feel: A tuned spring torque curve and guided friction make operation easy and consistent.

Cordless Spring System Sizing Guide

Input Data

Width × Drop (mm)
Slat material/density (PVC or composite)/weight
Ladder tape or cord ladder configuration and count

Matching Targets

Low effort up-lift, stable hold, controlled lowering across typical service conditions.

Pre-Tension Strategy

Validate at mid-span hold;
For heavy/wide builds, choose a higher-torque variant or deploy dual modules in parallel.

Cordless Spring System Installation

Prepare & Insert

Confirm headrail bay dimensions and hole pattern; deburr and clean chips.
Slide the L4 cartridge into the designated bay; align the main screw holes.

Lock & Align

Tighten the two main screws; verify gear mesh and take-up shaft free play.
Ensure equal path length on both sides to avoid skew.

Pre-Tension & Test

Add pre-tension turns per recommendation; perform the mid-span hold test.
Fine-tune if needed, close end caps, and re-check all fasteners.

A pictorial installation guide and pre-tension reference sheet are available for standardized workshop operations.

Durability & User Feel

Noise Controls

Optimized tooth geometry + material damping to suppress high-frequency mesh noise.
Sealed cavity helps block dust ingress and foreign objects that can induce squeaks.

User Feel

Target feel: “light start, even travel, let-go hold.”
Friendly to night-time residential use and quiet conference environments.

OEM/ODM

Custom Options

Housing color/branding (laser/foil).
Multiple torque bands and reduction ratios.
Headrail interfaces/holes/guides tailored to your platform.
Full kit supply: cartridge, brackets, end caps, take-up shaft, fasteners, and documentation.

Engineering Collaboration

Provide torque–displacement curves, assembly guidance, and field-feedback loops.
Clear ramp-up path from pilot → pre-production → mass production.

Use Cases

Residential Upgrades

Converting corded to cordless yields an immediate surface refresh; tether-related service calls decline markedly.

Hotels & Multifamily Projects

Higher-torque options accommodate frequent cycling; the sealed cavity reduces maintenance intervals.

Channel Acceptance

Cordless aesthetics align with many markets’ safety preferences, improving product selection and shelf presentation.

FAQ

Q1:Does a Cordless Spring System Need an Extra Brake?

A1:Within rated load, spring torque + guided friction is enough for stable hold. For heavy/wide builds, choose a higher-torque setup or dual modules.

Q2:How Do I Choose a Torque Band for a Cordless Spring System?

A2:Provide width × drop, slat density, ladder configuration to receive spec + pre-tension guidance.

Q3:Can This Cordless Spring System Be Used on Other Shade Types?

A3:L4 is tuned for faux wood venetians. Use dedicated models for roller, honeycomb, or zebra for best results.

Q4:How Do We Think About Life and Warranty on a Cordless Spring System?

A4:Life depends on load match, installation accuracy, usage frequency, and environment. Start with a prototype road test; we’ll co-optimize from real data.

Q5:Can You Ship a Full Kit with the Cordless Spring System?

A5:Yes. We can supply cartridge, brackets, end caps, take-up shaft, fasteners, and manuals in one carton for line-ready assembly.

Field Insight — Cordless Spring System in Real Projects

The DOSRON Cordless Spring System for faux wood venetian blinds combines a POM engineering housing, 301 stainless-steel spiral spring, and low-backlash polymer gears to deliver smooth cordless lift and stable hold at any height. Beyond the hardware, DOSRON supports you as an engineering partner—helping you size the system correctly, tune pre-tension on site, and scale from prototypes to mass production with traceable quality control.

Engineering support: Sizing calculations, torque-band selection, and pre-tension reference sheets.
OEM/ODM ready: One-stop customization of interfaces, colors, branding, and kits to fit your headrail system.
Easy to start: Send width × drop, slat material/density/weight, and ladder configuration; we return torque band + pre-tension suggestions and can arrange samples.

Cordless Spring System for Roman Blinds

vc-admin — Thu, 16 Oct 2025 10:09:57 +0000

Quick Summary

This cordless Spring System for Roman blinds is built around a T1 Spring Box with a constant-force spring,
synchronized by a Fiber glass Hexagonal rod and managed via Cord Reel + Cord Bundle.
The result is smooth travel, immediate stop-at-any-height behavior, and clean cordless aesthetics for OEM Roman blind platforms.

Spring System Overview for Cordless Roman Blinds

This Spring System integrates four key components inside the headrail to keep the lift cords fully internal
while maintaining controlled, repeatable motion:

T1 Spring Box — constant-force spring module defining the system force band
Cord Reel — manages cord winding/unwinding as shade travel changes
Cord Bundle — secures cords at the bottom rail and allows tension adjustment
Fiber glass Hexagonal rod — mechanical coupling shaft that synchronizes rotation

A common layout uses one centrally mounted T1 Spring Box with Cord Reels on both sides.
The Fiber glass Hexagonal rod passes through all rotating parts, linking them into one coherent Spring System.

Spring System Installation & Cord Winding Demonstration

This video walks through the installation process of the Spring System used in cordless bamboo Roman blinds,
from headrail mounting to final cord routing.

The video focuses on three critical installation stages:

Mounting the T1 Spring Box at the center of the wooden headrail
Installing and aligning the Cord Reel and Fiber glass Hexagonal rod
Final cord routing through the bamboo slats and tension setting at the Cord Bundle

At the end of the video, the cord winding behavior on the Cord Reel is shown in detail,
helping OEM customers verify correct wrap direction, wrap count, and rotation synchronization during lift.

Spring System Configuration Overview

The following table outlines typical configuration elements of the Spring System.
Final selection depends on Roman blind size, material weight, and OEM design requirements.

Test base on 96″ 2.4M
2 cord reel without resistance			2 cord reel with full resistance		adjustable incremental bearing capacity range
Spring Spec.	Initiative Capacity/g	End Capacity/g	Initiative Capacity/g	End Capacity/g	Initially adjustable bearing capacity/g	End adjustable bearing capacity/g
0.09-16-3000	720	320	1220	150	720~1200	320~150
0.10-16-3000	870	480	1550	200	870~1550	480~200
0.11-16-3000	1070	580	1820	270	1070~1820	580~270
0.12-16-3000	1270	780	2270	370	1270~2270	780~370

Note: For wide or heavy Roman blinds, Spring System force matching should be validated through sample testing.

T1 Spring Box: The Force Source of the Spring System

The T1 Spring Box is the core of this Spring System. Inside it, a constant-force spring
provides stable lifting assistance across travel, reducing sensitivity to fabric stacking changes and minimizing position drift.

In practical terms, the T1-based Spring System is engineered to keep the user experience consistent:
smooth lift, predictable lowering, and reliable stop-at-any-height behavior.

Cord Management Inside the Spring System

Cord Reel + Cord Bundle: Controlled Winding and Tension

In this Spring System, lift cords are anchored inside the Cord Reel and wound around its spool.
The cords then route through the bamboo/fabric structure (slats or lift passages) and terminate at the bottom rail where the
Cord Bundle locks and fine-tunes cord tension.

When the blind is fully lowered, most of the cord length is extended through the shade body, leaving fewer wraps on the Cord Reel.
As the blind is raised, cord wraps increase on the Cord Reel, and the rotation is transferred through the Fiber glass Hexagonal rod.

Fiber glass Hexagonal rod: Rotation Synchronization

The Fiber glass Hexagonal rod ensures synchronized rotation across the entire Spring System.
This rigid coupling helps prevent phase drift, uneven winding, or left–right imbalance during travel—especially valuable for OEM builds
where repeatability matters.

How the Cordless Spring System Operates

This is an externally cordless Spring System: no exposed pull cords or chains. Users operate the Roman blind by
pulling the bottom rail up or down. Releasing the rail causes the Spring System to stop immediately, enabling
“pull-and-stop” positioning.

During motion, cord wrap count changes on the Cord Reel, and the Fiber glass Hexagonal rod rotates accordingly.
This rotation coordination keeps the system behavior smooth and predictable across the full stroke.

Applications of the Spring System

This Spring System is designed for OEM Roman blind programs requiring clean aesthetics, internal cord routing,
and controlled manual operation. Typical applications include:

Bamboo Roman blinds
Fabric Roman blinds
Residential cordless window coverings
OEM private-label Roman blind platforms

FAQ: Spring System for Cordless Roman Blinds

These FAQs focus on how a cordless Spring System behaves in real OEM production and field use—stability, repeatability,
and installation control.

Q1: What makes this Spring System different from traditional Roman blind mechanisms?

Traditional Roman blind setups often rely on variable cord friction or manual locking behavior. This cordless
Spring System is built around a T1 Spring Box with constant-force output, helping the lift feel
more consistent across the full travel, not only at mid-height.

Q2: Is the Spring System completely cordless?

Yes. This is an externally cordless Spring System with no exposed pull cords or chains. Lift cords are routed internally
through the shade body and managed by the Cord Reel and Cord Bundle.

Q3: How does the Spring System stop at any position?

The Spring System combines stable constant-force assistance with controlled cord winding. Users operate the blind by pulling
the bottom rail; releasing it allows the system to stabilize quickly for reliable pull-and-stop operation.

Q4: What role does the T1 Spring Box play in Spring System stability?

The T1 Spring Box defines the force band of the entire Spring System. If spring output is unstable, downstream cord
adjustments cannot fully correct the platform behavior. That’s why the spring box is the core decision point in Roman blind programs.

Q5: Why use a Fiber glass Hexagonal rod instead of a round shaft?

The Fiber glass Hexagonal rod provides positive mechanical engagement and synchronized rotation across components. In a
Spring System, this helps reduce phase drift, uneven winding, and left–right mismatch risk during repeated cycling.

Q6: Can cord tension be adjusted during installation?

Yes. The Cord Bundle at the bottom rail supports fine tension tuning to level the shade and compensate for small assembly or
material tolerances, without changing the internal Spring System architecture.

Q7: Is this Spring System suitable for bamboo Roman blinds?

Yes. This Spring System is suitable for bamboo Roman blinds and fabric Roman blinds, where internal cord routing, clean
appearance, and stable manual control are required.

Q8: Is this Spring System designed for OEM production?

Yes. The design emphasis is on repeatability and synchronized rotation, helping the Spring System behave consistently across
production batches and real-world use—key requirements for OEM private-label Roman blind platforms.

Q9: What components should OEMs verify first when debugging performance?

Start with the force source and synchronization: the T1 Spring Box (output consistency), the Cord Reel (winding
smoothness), and the Fiber glass Hexagonal rod (rotation coupling). Then verify internal cord routing and bottom rail
termination at the Cord Bundle.

Q10: What installation factors most affect Spring System repeatability?

Consistent center mounting of the T1 Spring Box, correct alignment of Cord Reels, and stable engagement of the
Fiber glass Hexagonal rod are the biggest drivers. Final tuning is typically handled at the Cord Bundle to ensure
balanced cord tension and level operation.

Field Insight

A cordless Roman blind “feeling smooth” is easy to demonstrate. A Spring System staying stable across full travel,
production variation, and long-term cycling is what protects your OEM platform in the field.

T1 Spring Box defines the force band; the rest of the Spring System must stay synchronized inside it.
Cord Reel wrap changes are normal—what matters is controlled rotation without drift or uneven winding.
Fiber glass Hexagonal rod acts as the mechanical “synchronizer” that reduces left–right mismatch risk.
Cord Bundle provides practical tension tuning at the bottom rail for cleaner leveling and repeatability.
A well-built Spring System is a platform decision, not a cosmetic feature—choose it like an engineer.