Cam-Driven Switching Element for Roller Shutter Slat Indexing
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Solution Overview
Problem
Existing roller shutter systems with stackable slats face issues of compatibility with different types of slats, reliance on slat-activated switching mechanisms, and the presence of return parts like springs, leading to maintenance challenges and reliability problems.
Innovation Solution
A roller shutter system with a winding shaft and a receiving tray, featuring a rotating part with a cam-like geometry and a switching element that pivots independently of the slats, allowing for standard slat compatibility and operation without springs, using a needle to guide and orient slats into the tray.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If slat-activated switching mechanisms are used, then the slats can be guided into the receiving tray, but the system becomes dependent on specific slat types and requires maintenance of interacting components
Solution Approach 1:
Instead of having the slat activate the switching mechanism (slat-dependent), the invention inverts the relationship by having a cam-driven mechanism activate the switching element independently of the slat. The cam is rotated by the winding shaft, and this rotation actively pivots the switching element to guide the slat, reversing the causality and making the system slat-independent.
Solution Approach 2:
The switching element is designed with a universal function: it can guide any standard slat into the receiving tray regardless of the slat type. By decoupling the switching activation from the slat itself and using a cam-driven mechanism, the system achieves universality and can work with different slat types without requiring matched components.
2Stability of the object's composition
If return parts like springs are used in the switching mechanism, then the cam can be recalled to its initial position, but the system gains additional components that are sources of wear and failure
Solution Approach 1:
The invention extracts and eliminates the return spring from the mechanism. Instead of using a spring to recall the cam to its initial position, the system uses the continuous rotation of the winding shaft to drive the cam through its cycle. The cam's geometry and the switching element's design allow the system to function without the spring, removing a source of wear and failure.
Solution Approach 2:
The winding shaft's rotation serves dual purposes: it winds the shutter and simultaneously drives the cam to activate the switching element. The system uses its own operational motion (winding shaft rotation) to perform the switching function, eliminating the need for separate return mechanisms and reducing component count.
3Ease of operation
If blades interact with cams to cause tilting, then the slats can be oriented in the tray, but the switching reliability decreases over time due to loosening and shifting
Solution Approach 1:
The invention introduces a needle as an intermediary element between the switching element and the slat. Instead of the slat directly interacting with the cam or switching mechanism, the needle mediates the interaction by engaging with the slat's edge and guiding it into the tray. This intermediary reduces wear and improves reliability by providing a controlled, consistent interaction point.
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
This solution enhances reliability and reduces maintenance costs by allowing standard slats to be used across different systems, eliminating the need for slat-activated switching and spring-based mechanisms, resulting in improved operational efficiency and reduced maintenance complexity.
Implementation Method 1
The moving part has a geometry acting as a cam. It cooperates with the switching element so as to cause it to pivot alternately from a first position to a second position as a function of its angular positions
Implementation Method 2
The needle extends on either side of the switching element, forming two opposite edges adapted to guide the end of the blades
Data Source
Figure 1
Figure 2
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AI summary
The present invention relates to a roller shutter (1) comprising a receiving tray (20) adapted to hold the slats of the roller shutter (1), and including a guide element (60) fixed to each end of the roller shutter so as to be able to pivot. The roller shutter further includes a rotating movable part (50) attached to each end of the winding axle and cooperating with the guide element (60) so as to rotate it alternately from a first position to a second position depending on the angular positions of the movable part (50). The movable part (50) and the guide element (60) constitute a system for indexing the position of the slats in the receiving tray according to the angular position of the winding axle.