Direct-Drive Roller Blind Wire Tension Layout for Compact Z-Package
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Solution Overview
Problem
Existing direct driven roller blind assemblies require a springlike element within the pull beam, increasing the inner diameter and z-package, which counteracts the reduction achieved by eliminating the springlike assembly in the winding tube.
Innovation Solution
A roller blind assembly with a winding tube directly driven by a motor, incorporating wire pulleys, springlike elements, and tensioning wires that run along wire return elements, allowing the springlike element to be positioned outside the pull beam, thus reducing the required inner diameter and z-package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a springlike element is provided within the pull beam to maintain tension in tensioning wires, then synchronized movement of the pull beam with the winding tube is ensured, but the inner diameter of the pull beam and z-package increase
Solution Approach 1:
The springlike element is extracted from the interior of the pull beam and repositioned to the exterior. The tensioning wires extend from the winding tube through the pull beam to the springlike element positioned outside, eliminating the need for internal spring housing while maintaining the tensioning function and synchronized movement reliability.
2Volume of moving object
If the springlike element is positioned outside the pull beam, then the z-package is reduced, but the tensioning wire arrangement becomes more complex
Solution Approach 1:
The springlike element is repositioned from the longitudinal dimension (inside the pull beam) to the transverse dimension (outside the pull beam). This spatial reconfiguration reduces the z-package while the wire arrangement complexity is managed through structured routing guides and connection points.
3Force
If tensioning wires are connected via springlike element within the pull beam, then tension is maintained, but the required inner diameter of the pull beam increases
Solution Approach 1:
The springlike element is extracted from the pull beam interior and positioned externally. The tensioning wires maintain force transmission by extending from the winding tube through the pull beam to the externally positioned springlike element, preserving tension maintenance while reducing the pull beam's inner diameter requirement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution maintains synchronized movement of the pull beam with the winding tube while reducing the z-package, enabling a more compact design and efficient operation of the roller blind assembly.
Implementation Method 1
a springlike element having a wire return element arranged on each respective outer end and tensioning wires connected at first ends to one of the respective wire pulleys and connected at second ends to the operating beam. And wherein the tensioning wires run along the wire return elements of the springlike element such that the springlike element tensions the tensioning wires.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Roller blind assembly comprising a winding tube (22) configured to be directly driven by a motor (27), a rollo screen (20) and an operating beam (24) and a pair of parallel rollo guides (28) for guiding the rollo screen (20). The rollo screen (20) is movable along the rollo guides (28) between a closed position and an opened position by driving the winding tube (22). The assembly further including wire pulleys (25, 25') on opposite outer ends of the winding tube (22), a springlike element (31) having a pulley (33, 33') arranged on each respective outer end and tensioning wires (30, 30') connected at first ends to one of the respective wire pulleys (25, 25') and connected at second ends to the operating beam (24). And wherein the tensioning wires (30,30') run along the pulleys (33,33') of the springlike element (31) such that the springlike element (31) tensions the tensioning wires (30, 30').