Screen Roller Motor Positioning for Compact Design
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Solution Overview
Problem
In motorized screen devices with lateral thickenings, the skewing of the bottom lath and creasing/folding over of thickenings occur due to uneven rolling and limited space, especially with longer screens, as the thickenings are restricted by the motor's dimensions in the rolled-up state.
Innovation Solution
The motor is positioned further into the screen roller, allowing the thickening to be closer to the screen roller axis than the motor's furthest point, enabling a more compact screen roller design and preventing skewing and creasing, with a screen roller end piece having a constriction and tapering design for improved guidance and fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor is positioned at the end of the screen roller, then the motor is easily accessible for installation and maintenance, but the thickening cannot come closer to the screen roller axis, causing skewing of the bottom lath and creasing of the screen
Solution Approach 1:
The motor is moved from the end position to an intermediate position along the screen roller axis, utilizing the longitudinal dimension of the screen roller to resolve the conflict between accessibility and rolling precision. This dimensional repositioning allows the thickening to approach the axis while maintaining motor access.
Solution Approach 2:
Instead of positioning the motor at the end for accessibility, the invention inverts the approach by placing the motor at an intermediate position, thereby prioritizing rolling precision while still maintaining reasonable accessibility for maintenance operations.
2Ease of operation
If the screen roller diameter is increased to accommodate the motor at the end, then the motor can be easily accessed, but the screen device becomes less compact and requires more space
Solution Approach 1:
The solution utilizes the longitudinal dimension of the screen roller to reposition the motor, avoiding the need to increase the radial dimension (diameter). This allows compact screen device design while maintaining motor accessibility at an intermediate position along the roller length.
3Reliability
If the thickening is made thicker to secure the screen in guides, then the screen is secured well against wind and flapping, but more space is required in the rolled-up state
Solution Approach 1:
The screen roller is designed with a constriction at the end that anticipates the position of the thickening in the rolled-up state. This preliminary geometric feature ensures that even thicker enhancements are properly guided and contained, preventing folding over while accommodating the necessary thickness for reliable screen security.
Data Source
AI summary
A screen device comprising: a screen roller (1), having a screen (2), which can be rolled up and unrolled hereon and which on at least one lateral side is provided with a thickening (6), a motor (7) for driving the screen roller (1), which motor, at that end of the screen roller (1) closest to the thickening (6), is disposed at least partially in the screen roller (1), wherein the motor (7) is fitted so far into the screen roller (1) that the thickening (6), in the rolled-up state of the screen (2), is positioned at least partially closer to the screen roller axis (A) than any point on that part of the motor (7) that is fitted in the screen roller (1), which point is situated the furthest from this screen roller axis (A).