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.

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

Spring Lift Mechanism System Overview

The R38L Spring Lift Mechanism is a mechanical cordless lifting system installed inside aluminum roller tubes.
It replaces traditional cords or chains while improving safety, stability, and user experience.

The complete system consists of:

• Spring Box – Core energy storage unit
• Brake – Anti-drop holding component
• Shaft – Structural carrier for multiple Spring Boxes
• Circlip – Fixing component between Spring Box and Brake
• Pin – Locking pin used during pre-winding

Spring Lift Mechanism Installation Overview

Step 1: Spring Box and Shaft Assembly

Install the required number of Spring Boxes onto the Shaft in sequence
and secure each unit using the appropriate Circlip.

Step 2: Brake Installation

Mount the Brake at the end of the Shaft to complete the assembly.

Step 3: Pre-Winding

Pre-wind the Spring Lift Mechanism by three turns and lock it using the Pin.

Step 4: Tube Installation and Testing

Insert the assembled system into the aluminum roller tube
and test lifting smoothness.

Step 5: Activation

Remove the Pin to activate the Spring Lift Mechanism after final testing.

Spring Lift Mechanism Core: Spring Box

At the core of the R38L Spring Lift Mechanism is the Spring Box.
Each Spring Box contains a precision-engineered 301 stainless steel constant force spring.

The spring strip is wound in a rolled form, similar to roller shade fabric,
allowing the spring to deliver a stable lifting force throughout the entire travel range.

The Spring Box housing is manufactured from POM engineering plastic,
selected for low friction, dimensional stability, and quiet operation.

Brake Function in the Spring Lift Mechanism

The Brake plays a critical safety role in the Spring Lift Mechanism.
Its primary function is not lifting, but holding.

By preventing sudden downward movement, the Brake ensures controlled operation,
especially for large and heavy roller shades.

Spring Lift Mechanism Assembly Structure

The R38L Spring Lift Mechanism is assembled linearly along the Shaft:

1. The Shaft acts as the structural base
2. Spring Boxes are installed sequentially
3. Each Spring Box is secured using a Circlip
4. The Brake is installed last to complete the system

Before insertion into the roller tube, the system must be pre-wound by three turns.
A Pin is used to lock the spring during installation.

After final installation and smoothness testing, the Pin is removed to activate the system.

Configurable Load Capacity for Heavy Roller Shades

The R38L Spring Lift Mechanism is designed for large and heavy roller shade systems.
A single Shaft can support up to five Spring Boxes.

The required spring configuration depends on:

• Total fabric weight
• Bottom rail weight
• Total shade drop

After weighing the fabric and bottom rail, the appropriate Spring Box model
and quantity are selected using the official selection chart.

Spring Lift Mechanism Selection Chart

Correct spring selection is essential for stable performance and long-term durability.
Please measure the combined weight of the fabric and bottom rail before selecting the configuration.

Final configurations should be validated through prototype testing.

Application Scenarios for the R38L Spring Lift Mechanism

The R38L Spring Lift Mechanism is designed for roller shade systems
where standard spring solutions reach their performance limits.
It is especially suitable for the following application scenarios:

Large-Width Roller Shades

For wide roller shades, fabric weight and bottom rail leverage increase significantly.
The R38L system supports multiple Spring Boxes on a single Shaft,
allowing OEMs to distribute lifting force evenly across the width.

Heavy Fabric Roller Shades

Roller shades made with blackout fabrics, textured materials,
or laminated fabrics place higher demands on lifting and holding stability.
The R38L Spring Lift Mechanism provides controlled lift combined with reliable braking.

Commercial and Project-Based Roller Shades

In hotels, offices, and public buildings,
roller shades are often larger, heavier, and used more frequently.
The R38L system is designed to handle these higher load and durability requirements.

Premium Cordless Roller Shade Product Lines

For manufacturers developing high-end cordless roller shades,
the R38L Spring Lift Mechanism offers a scalable and engineered solution
that balances smooth operation with long-term reliability.

FAQ – R38L Spring Lift Mechanism

Q1: What type of shades is the R38L Spring Lift Mechanism designed for?

The R38L Spring Lift Mechanism is designed for cordless roller shades,
particularly large and heavy fabric systems.

Q2: Why does the R38L system support multiple Spring Boxes?

Multiple Spring Boxes allow precise force matching for wide and heavy shades
instead of relying on a single oversized spring.

Q3: How do I select the correct Spring Box model?

Selection is based on fabric weight, bottom rail weight, and shade drop,
using the official selection chart.

Q4: What does the spring thickness code indicate?

Spring thickness determines lifting force.
Thicker springs provide higher force but shorter maximum travel.

Q5: Why do thinner springs support longer shade drops?

Thinner springs allow more winding turns within the same Spring Box,
resulting in longer usable travel.

Q6: What is the purpose of the Brake?

The Brake prevents sudden downward movement and provides holding stability.

Q7: Why is pre-winding required?

Pre-winding stores initial energy in the system and ensures proper operation after installation.

Q8: What happens if the spring configuration is incorrect?

Improper configuration may cause drifting, rebound, or heavy operation.

Q9: Is the R38L compatible with motorized systems?

The R38L is designed for manual cordless operation.
Hybrid systems require separate evaluation.

Q10: Who is the target customer for the R38L system?

The R38L Spring Lift Mechanism is supplied exclusively to OEM window covering manufacturers.