Screen Roller Narrowing Prevents Thickening Creasing
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Solution Overview
Problem
Existing screen devices with continuous lateral thickenings for wind resistance face issues with creasing, wrinkling, and flapping when wound onto a screen roller, and tensioning systems either fail to prevent these issues or compromise wind resistance and insect screening functionality.
Innovation Solution
A screen device with a screen roller featuring continuous flexible thickenings guided by screen guides and a tensioning system, where the screen roller end pieces have a narrowing with a specific drop width and height, and a convexly curved outer surface to prevent wrinkling and flapping, combined with a tensioning system using a reel, reversing wheel, and spring system for unwinding direction tensioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous flexible thickenings are provided on lateral sides of screen to prevent flapping and improve wind resistance, then wind resistance and security are improved, but the thickenings cause creasing and wrinkling when wound onto screen roller
Solution Approach 1:
The narrowing on the screen roller end piece is divided into multiple segments: a first narrowing portion with a first slope angle, a second narrowing portion with a second slope angle, and an optional third narrowing portion. This segmentation allows each portion to perform a specific function - the first portion guides the thickening, the second portion prevents folding, and the third portion (if present) provides additional guidance, collectively resolving the contradiction between maintaining thickening integrity and preventing creasing.
Solution Approach 2:
Different portions of the narrowing have different geometric properties (slope angles, widths) tailored to specific local requirements. The first narrowing portion has a gentler slope for guiding the thickening smoothly, while the second narrowing portion has a steeper slope for preventing folding. This local differentiation of geometric quality allows the structure to simultaneously achieve guidance and crease prevention.
2Stability of the object's composition
If thickenings extend beyond ends of screen roller to prevent piling up, then winding issues are prevented, but screen creases and wrinkles at abrupt transition
Solution Approach 1:
The narrowing portions are designed with curved surfaces rather than sharp edges. The first narrowing portion has a curved surface that gradually guides the thickening onto the roller, and the second narrowing portion has a curved surface that smoothly transitions the thickening. This curvature eliminates abrupt transitions that cause wrinkling while maintaining the thickening's position stability during winding.
3Reliability
If tensioning system is added to prevent wrinkling and flapping, then screen stability is improved, but thickening folding occurs when winding
Solution Approach 1:
The narrowing structure is designed in advance to counteract the folding tendency of the thickening. The first narrowing portion with its specific slope angle creates a guiding effect that prevents the thickening from folding before the tensioning system even engages. This preliminary anti-action works in conjunction with the tensioning system to eliminate folding without compromising screen stability.
4Shape
If discontinuous thickenings are used to reduce winding problems, then folding is reduced, but wind resistance and insect screening functionality are compromised
Solution Approach 1:
The continuous thickening is maintained throughout the screen, and the narrowing structure is designed in advance to handle the thickening properly during winding. The first and second narrowing portions create a guided path that prevents folding of the continuous thickening, allowing the screen to maintain both continuous coverage for wind resistance and insect screening, and fold-free winding.
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 solution effectively prevents creasing and flapping of the screen during winding and unwinding while maintaining wind resistance and insect screening functionality, ensuring the screen remains securely attached to the guides without excessive thickness or creasing.
Implementation Method 1
a tensioning system for tensioning the screen (1) in the unwinding direction... comprising a reel (7) for tensioning the screen (1) in the unwinding direction by means of a reversing wheel (8) and a spring system (9)
Data Source
Figure 1~3
AI summary
The invention relates to a screen (1) which can be wound onto and unwound from a screen roller using a maximum of N rotations, in which flexible thickenings (3) with a thickness d are guided in screen guides during the winding and unwinding movement, in which creasing of the screen (1) and folding over of the thickenings (3) during winding and unwinding is prevented: - by screen roller end pieces (4) provided with a narrowing (5) with a drop (6), having a drop width b and drop height h, in which the partial drop width bl, in which the drop height is 75% of h, is at least 5 mm and at most 350,18N+0,7d and with diameters which decrease with respect to the diameter ø of the screen roller, - and by tensioning the screen (1) in the unwinding direction by using a tensioning system.