Roller Shutter Torque Synchronization via Inner Shaft Coupling
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Solution Overview
Problem
Roller shutters experience uneven retraction due to uneven torque distribution and lack of rigidity, leading to increased manufacturing costs and operational difficulties, especially in longer rollers.
Innovation Solution
The implementation of a rotation synchronizer mechanism that includes an outer tube, inner shaft, and rotation synchronizers to ensure even torque distribution across the roller length, enhancing rigidity without significant weight or cost increases, using a rotation power source and shaft extenders to synchronize rotations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power device is attached to one end of the roller to provide torque, then the roller can be operated, but the torque cannot be evenly conveyed across the entire length of the roller causing uneven retraction
Solution Approach 1:
The roller is divided into multiple segments along its length, with multiple power devices distributed at different positions instead of a single power device at one end. This segmentation allows torque to be applied at multiple points simultaneously, ensuring even torque distribution and uniform screen retraction across the entire roller length.
2Strength
If the thickness of the roller tube is increased to compensate for deforming, then the rigidity is improved, but the manufacturing cost and weight increase significantly
Solution Approach 1:
The patent introduces support structures that provide upward counterbalancing forces to offset the downward force of gravity on the screen. These support structures are distributed along the roller length and provide mechanical support to counteract the weight, allowing the use of thinner, lighter roller tubes while maintaining rigidity and preventing deformation.
3Reliability
If multiple power devices are distributed along the roller, then the torque distribution is improved, but the device complexity increases
Solution Approach 1:
The patent designs the power devices to be identical or substantially similar units that can be interchangeably installed at different positions along the roller. Each power device performs the same function of providing torque to the roller shaft. This multi-functionality approach simplifies the overall system design, as the same standardized component is used repeatedly, reducing design complexity despite having multiple devices.
Data Source
AI summary
An apparatus for ensuring evenness and smoothness in the operations of a roller shutter or window blind is provided. The apparatus synchronizes the torque applied across the length of the roller. The apparatus also enhances the rigidity of the roller tube without significantly increasing the cost and the weight of the roller shutter. The apparatus may include an outer tube, a rotation power source, an inner shaft, and a rotation synchronizer. The inner shaft is disposed within the outer tube. The rotation synchronizer is installed at the inner shaft to rotationally couple the inner shaft with the outer tube. A rotation power source is installed at one end of the outer tube or the inner shaft to provide power to rotate the inner shaft and the outer tube. The outer tube may be for winding the screen of a roller shutter, or a lifting or tilting cord of a horizontal blind.