Compensation Spring with Variable Turn Spacing for Screen Drive Systems
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Solution Overview
Problem
Conventional drive systems for roll-up screens face high electrical power consumption due to substantial forces required to wind up the screen, and existing compensation springs are unstable and noisy, especially when housed in limited spaces.
Innovation Solution
A drive system with a compensation spring featuring a combination of contiguous and non-contiguous turns, where the non-contiguous turns have a greater spacing, allowing for better torque absorption and reduced noise without additional parts, and enabling the spring to be housed in compact spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a compensation spring is used to reduce power consumption, then electrical power consumption is reduced, but the spring becomes unstable and noisy when housed in limited spaces
Solution Approach 1:
The compensation spring is divided into two distinct series of turns: a first series with first spacing and a second series with greater spacing. This segmentation allows different regions of the spring to serve different functions - the first series provides compact winding for limited space while the second series provides stability and reduces noise, resolving the contradiction between power consumption reduction and spring stability.
Solution Approach 2:
Different portions of the spring have different turn spacings tailored to their specific functional requirements. The first series of turns has tighter spacing for compactness, while the second series has greater spacing for stability and noise reduction. This local differentiation allows the spring to simultaneously achieve compact housing and stable operation.
2Volume of moving object
If the compensation spring is stretched to provide space for completely wound configuration, then sufficient space is provided, but the spring becomes unstable and noisy
Solution Approach 1:
The spring is segmented into two series of turns with different spacing characteristics. The first series can be tightly wound to fit compact spaces, while the second series maintains greater spacing to prevent instability and noise. This segmentation allows the spring to achieve both compact configuration and stable operation without requiring excessive stretching.
Solution Approach 2:
The spring design incorporates changes in the spacing parameter between turns across different series. By varying the spacing from the first series to the second series, the spring can accommodate compact spaces while maintaining stability, eliminating the need to over-stretch the spring for adequate space.
3Volume of moving object
If the compensation spring is housed in limited spaces, then compactness is achieved, but the spring generates noise and is unstable
Solution Approach 1:
The compensation spring is divided into two series of turns with different spacing characteristics. The first series provides compact winding for limited housing space, while the second series with greater spacing reduces noise and instability. This segmentation enables the spring to fit compactly without generating excessive noise.
Solution Approach 2:
Different regions of the spring have different turn spacings optimized for their local functions. The tighter spacing in the first series accommodates limited housing space, while the greater spacing in the second series reduces noise and vibration, allowing compact housing without harmful noise generation.
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 design reduces noise and instability issues while maintaining compactness, allowing for efficient power usage and improved performance by effectively managing the spring's deformation and torque within the drive system.
Implementation Method 1
use springs referred to as 'compensation' springs so as to at least partially compensate for the variable torque created by the shutter-apron
Implementation Method 2
The weight of this screen exerts on the drive system a variable torque, in particular as a function of the position of this screen
Implementation Method 3
During at least part of the lowering of the screen, the spring is placed under stress. The accumulated energy is then released during at least part of the phase of retracting of the screen
Data Source
AI summary
Disclosed is a drive system for driving a screen, that includes an actuator designed to drive in rotation a winding shaft associated with the screen, and a compensation spring. The compensation spring includes a first series of tums having a first spacing; and at least one second series of turns having a second spacing, with a value that is greater than the value of the first spacing.