Direct-Drive Roller Blind Tensioning for a Smaller 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, featuring wire pulleys, springlike elements, and tensioning wires that run along wire return elements, allowing the springlike element to be positioned outside the pull beam, 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 the tensioning wires can maintain proper tension for synchronized movement, but the inner diameter of the pull beam increases and the z-package height increases
Solution Approach 1:
The springlike element is extracted from the interior of the pull beam and relocated to the exterior, specifically positioned above the winding tube. This removes the space-consuming component from the critical interior space of the pull beam, allowing for a reduced inner diameter and smaller z-package while maintaining the tensioning function.
Solution Approach 2:
The springlike element is repositioned from a horizontal arrangement within the pull beam to a vertical arrangement above the winding tube. This dimensional change allows the tensioning mechanism to occupy space in the vertical dimension rather than increasing the horizontal inner diameter requirements of the pull beam.
2Reliability
If the springlike element is positioned within the pull beam, then the tensioning wires can be properly tensioned, but the operating beam becomes thicker and the overall assembly height increases
Solution Approach 1:
The springlike element is extracted from the interior of the operating beam and repositioned externally above the winding tube. This eliminates the need for the operating beam to accommodate the springlike element within its structure, allowing for a thinner operating beam cross-section.
3Volume of moving object
If the inner diameter of the winding tube is reduced to achieve smaller z-package, then the overall assembly becomes more compact, but space for springlike assembly in the winding tube becomes insufficient
Solution Approach 1:
The springlike assembly is extracted from the winding tube structure entirely and repositioned above it. This allows the winding tube to have a smaller inner diameter without needing to accommodate the springlike assembly, achieving the compact z-package goal while maintaining all necessary functions.
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 ensures synchronized movement of the pull beam with the winding tube while minimizing the z-package, providing a more compact design and allowing for a thinner operating beam.
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
AI summary
A roller blind assembly includes a winding tube configured to be directly driven by a motor, a rollo screen configured to be wound up and off on the winding tube at one side and having an operating beam at an opposite side and including a pair of parallel rollo guides for guiding the rollo screen. The rollo screen is movable along the rollo guides between a closed position and an opened position by driving the winding tube. The assembly further includes wire pulleys on opposite outer ends of the winding tube, a springlike element having a pulley 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. The tensioning wires run along the pulleys of the springlike element such that the springlike element tensions the tensioning wires.