Blind Body Braking Mechanism Preventing Cord Tangling
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Solution Overview
Problem
In non-cord window blind assemblies, the transmission cord tends to become tangled when wound around the take-up wheel, leading to unsmooth movement and potential sticking, causing asymmetrical placement or incomplete extension/retraction of the blind body.
Innovation Solution
A blind body braking mechanism comprising a casing, winding mechanism, two take-up wheels, two one-way clutch units, and two guide rods, where the transmission cords are wound around one-way clutch wheels, creating friction for smooth extension and holding the blind body in position, and guide rods facilitate smooth winding to prevent tangling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the transmission cord is wound round the take-up wheel multiple turns to maintain tension, then the tension during movement is improved, but the cord becomes tangled and causes unsmooth movement
Solution Approach 1:
The patent introduces a guide wheel to segment the cord winding process. The guide wheel divides the cord path into controlled sections, ensuring each turn is properly guided and separated from others, preventing tangling while maintaining multiple wraps for tension.
Solution Approach 2:
The guide wheel acts as an intermediary component between the take-up wheel and the transmission cord. It mediates the cord's path around the take-up wheel, ensuring proper alignment and preventing direct contact that would cause tangling, while still allowing multiple wraps to maintain tension.
2Device complexity
If the guide wheel provides limited guiding effect to maintain simplicity, then the device complexity is reduced, but the cord tangling and interference increases
Solution Approach 1:
The guide wheel is designed to rotate dynamically as the take-up wheel operates. This rotational capability allows the guide wheel to adapt to the cord's movement and maintain proper guiding throughout the winding process, preventing tangling without requiring a complex fixed guiding structure.
Solution Approach 2:
The guide wheel introduces a spatial dimension to the cord path by creating a three-dimensional wrapping pattern around the take-up wheel. This dimensional approach separates the cord turns in space, preventing them from interfering with each other while maintaining the necessary guiding function.
3Force
If multiple turns of transmission cord are wound round the take-up wheel, then the tension is maintained, but the cord gets tangled and stuck
Solution Approach 1:
The guide wheel performs preliminary action by pre-establishing the correct cord path before the cord reaches the take-up wheel. By guiding the cord into proper alignment in advance, the guide wheel prevents tangling from occurring during the winding process, ensuring smooth operation throughout multiple wraps.
Solution Approach 2:
The guide wheel serves as an intermediary that facilitates smooth cord transfer to the take-up wheel. It reduces friction and prevents direct contact between adjacent cord turns, allowing multiple wraps to be formed without sticking or tangling, thereby maintaining actuation smoothness.
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 mechanism ensures smooth and precise positioning of the blind body with reduced tangling and interference, allowing for optimal actuation and maintaining the blind body's position effectively.
Implementation Method 1
the friction resistance created between the transmission cords and the respective one-way clutch wheels causes the respective one-way clutch wheels to rotate, enabling the blind body to be smoothly extended out
Implementation Method 2
each comprising a one-way clutch wheel
Implementation Method 3
the functioning of the guide rods enabling the transmission cords to be smoothly wound round the respective take-up wheels
Data Source
AI summary
A blind body braking mechanism used in a non-cord window blind assembly is disclosed to include two take-up wheels, two one-way clutch units respectively disposed adjacent to the two take-up wheels and respectively provide one clutch wheel, two guide rods respectively disposed at one lateral side relative to one respective take-up wheel in a parallel manner relative to the axis of the take-up wheels, and two transmission cords respectively extending over one respective guide rod and wound round one respective one-way clutch wheel with respective one end thereof fixedly connected to one respective one-way clutch wheel. Subject to the functioning of the guide rods, the transmission cords can be properly wound round the respective take-up wheels.