Windable Screen Counterweight Layout for Torque-Balanced Winding
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Solution Overview
Problem
Existing movable screens with windable canvases face challenges in compensating for torque imbalances during winding, leading to potential unwinding issues when the motorized winding means is not activated, particularly when the canvas winds directly onto the motorized mechanism without lateral guiding means or a bottom box to contain the winding mechanism.
Innovation Solution
A motorized operating device that includes a winding tube with an actuator and a compensating mechanism using gravity or additional mass to counteract unwinding torque, allowing the canvas to wind directly on the motorized winding means without external frame contact, utilizing a lateral element and additional mass or a roller to balance torque, ensuring the canvas remains tensioned and prevents unwinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the canvas winds directly on the motorized winding means without lateral guiding means or bottom box, then the device complexity is reduced and the canvas configuration is simplified, but torque imbalance occurs causing unwinding when the motor is not activated
Solution Approach 1:
The patent applies the counterweight principle by introducing a compensating mass that generates a gravitational torque to balance the variable tilting torque produced by the canvas winding. The compensating mass is positioned on an extension of the winding tube axis, creating a counteracting moment that prevents unwinding when the motor is inactive. This directly addresses the torque imbalance problem while maintaining the simplified direct-winding structure.
2Ease of operation
If the canvas winds directly on the motorized winding means, then the operating device can be suspended solely by the canvas without frame contact, but variable tilting torque causes vibrations and wear on the mounting frame
Solution Approach 1:
The compensating mass creates a stabilizing gravitational torque that counteracts the variable tilting torque during canvas winding. This balance reduces dynamic imbalances, minimizing vibrations and wear on the frame mounting points while preserving the simplified suspended installation approach.
Solution Approach 2:
The compensating mass is positioned to create a gravitational potential that balances the torque variations throughout the winding range. By adjusting the mass position and magnitude, the system achieves torque equilibrium across different canvas positions, reducing harmful vibrations and wear.
3Device complexity
If no compensating mechanism is used, then the device structure remains simple, but the canvas may unwind when the motorized winding means is not activated
Solution Approach 1:
The compensating mass provides a passive gravitational counterbalance that prevents canvas unwinding without requiring active control mechanisms. This simple mass-based solution maintains structural simplicity while ensuring position stability throughout the motor's inactive periods.
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 allows for a compact, efficient, and aesthetically pleasing operation of the screen, reducing vibrations and noise transmission to the building structure, maintaining canvas tension without frame contact, and minimizing wear and tear on the canvas.
Implementation Method 1
The weight of the operating device creates a canvas unwinding torque
Implementation Method 2
The device includes a means for compensating the unwinding torque which acts exclusively by interaction with gravity and/or with the canvas
Implementation Method 3
The means for compensating the unwinding torque can act by the application of a force of the canvas on said means and/or by the application of the weight of a mass of said means
Data Source
AI summary
A motorized operating interior device for operating a movable interior screen with a windable canvas of a window covering device or of a projection screen device, the motorized operating interior device configured to be suspended by the canvas and including:a winding tube which is movable around a first axis and on which the canvas is adapted to be wound,an actuator which is disposed at least in part in the tube,a first element for fixing a first end of the canvas to the winding tube,the weight of the motorized operating interior device creating a canvas unwinding torque, wherein said operating device includes an compensating element for compensating for the unwinding torque and which acts exclusively by either interaction with gravity or with the canvas or both.