Sheet Folding Apparatus Push Member Timing Control
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Solution Overview
Problem
Existing sheet folding apparatuses face issues with positional accuracy and irregularities in folding due to vertical gaps and sliding of sheets, particularly with thin and soft papers, leading to variations in folded dimensions and impaired appearance.
Innovation Solution
A sheet folding apparatus comprising a folding roller pair, a conveyance roller, a push member, and a control section that synchronizes the operation of the conveyance roller and push member to maintain sheet alignment and prevent sagging, ensuring precise folding by controlling the push member's movement while conveying the sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the push member is moved from the retreat position to the push position, then the sheet is pushed to the predetermined position for folding, but a vertical gap arises between the push member and the upper guide plate, causing the sheet to droop downward and shift position
Solution Approach 1:
The control section starts moving the push member from the retreat position toward the push position before the sheet reaches the upper guide plate, and completes the movement by the time the sheet contacts the upper guide plate. This preliminary timing action ensures the push member is in the correct position to support the sheet without creating a vertical gap that would cause drooping or positional shifts during the folding process.
Solution Approach 2:
The control section monitors the position of the sheet and adjusts the push member's movement timing accordingly. By using feedback from sheet position detection, the system dynamically coordinates the push member's movement to maintain proper support, preventing the sheet from drooping or shifting while ensuring accurate folding position.
2Manufacturing precision
If the push member moves while the sheet is being conveyed, then the sheet can be pushed to the correct position, but the sheet and push member may slide or displace relative to each other depending on sheet characteristics
Solution Approach 1:
The control section initiates the push member's movement in advance, before the sheet requires pushing, and completes the movement synchronously with the sheet's conveyance. This preliminary timing ensures that the push member and sheet move in coordinated fashion, minimizing relative displacement and sliding that would otherwise occur due to differences in sheet characteristics such as surface smoothness and rigidity.
Solution Approach 2:
The control section adjusts the timing parameters of the push member's movement based on sheet conveyance characteristics. By dynamically changing the movement timing parameters, the system adapts to different sheet characteristics and maintains stable relative positioning between the push member and sheet throughout the pushing process, ensuring consistent fold positions.
3Manufacturing precision
If the push member is positioned close to the draw-in port to push the sheet, then folding accuracy is improved, but the upstream side part of the sheet droops downward due to the vertical gap
Solution Approach 1:
The control section times the push member's movement to complete before the sheet reaches the upper guide plate, ensuring the push member is positioned close to the draw-in port for accurate folding while avoiding the creation of a vertical gap that would cause the sheet to droop. This preliminary timing action maintains both folding accuracy and sheet stability during conveyance.
Data Source
AI summary
In a sheet folding apparatus for folding a sheet, a sheet is pushed at a predetermined position thereof by a push member while the sheet is being conveyed by a conveyance roller. The predetermined position of the sheet is guided to the nip section of a folding roller pair. Then, the sheet is nipped at the predetermined position thereof and folded by the folding roller pair.