Suspension Screen Sub Roll Anti-Curve Mechanism
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Solution Overview
Problem
Large size suspension type-screen devices with rolls having a larger longitudinal dimension and smaller lateral dimension tend to downwardly curve, leading to a bow shape, which results in a v-shaped wrinkle in the screen during pull-out, causing image distortion when projected upon.
Innovation Solution
Incorporating a sub roll rotatably supported on the casing, adjacent to the main roll, with a longitudinally curved axis that can move upwardly or downwardly to support the screen at the start of pull-out, thereby preventing the downward curve and wrinkle formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the roll has a larger longitudinal dimension and smaller lateral dimension, then the device complexity is reduced, but the roll downwardly curves to form a bow shape due to gravity load
Solution Approach 1:
A support rod is introduced as an intermediary element between the roll and the casing. The support rod extends from the center of the roll to the casing, providing mechanical support that prevents the roll from downwardly curving under gravity load, thus maintaining the roll's shape without increasing device complexity
Solution Approach 2:
The support rod is pre-installed in the casing before the roll is mounted. This preliminary action ensures that the structural support is already in place to counteract gravity loads, preventing the roll from curving during operation
2Ease of operation
If the roll downwardly curves to form a bow shape, then the screen is pulled out, but a v-shaped wrinkle occurs in the screen at the upper side portion
Solution Approach 1:
The support rod acts as a mediator that prevents the roll from curving downward. By maintaining the roll's straight shape, the support rod ensures that the screen is pulled out smoothly without forming v-shaped wrinkles at the upper side portion
Solution Approach 2:
The support rod provides preliminary anti-action by counteracting the gravity load on the roll before the screen is pulled out. This prevents the roll from curving and subsequently prevents the formation of wrinkles in the screen during the pull-out process
3Productivity
If the screen has a downward curve in bow shape, then the screen is pulled out completely, but image distortion occurs when projected on the v-shaped wrinkle portion
Solution Approach 1:
The support rod serves as an intermediary that maintains the roll's straight shape, ensuring the screen is pulled out in a straight configuration. This eliminates v-shaped wrinkles and prevents image distortion during projection, while still allowing complete screen pull-out
Solution Approach 2:
The support rod is installed in advance to prevent roll curvature before the screen is pulled out. This preliminary preventive action ensures that the screen maintains its shape throughout the pull-out process, resulting in clear image projection without distortion
Data Source
AI summary
The present invention relates to a suspension type-screen device. The suspension type-screen device of the present invention includes a main roll rotatably supported on a casing; and a screen configured to be pulled back onto the main roll upon a storing thereof and to be pulled out downwardly from the main roll upon an use thereof. In particular, the suspension type-screen device of the present invention further includes a sub roll, and the sub roll is configured to be capable of supporting the screen located at a portion where a pull-out from the main roll is started.