Sheet Folding Apparatus Speed Differential Control
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Solution Overview
Problem
Existing sheet folding apparatuses often cause displacement of the folded sheet during transfer between rollers, particularly when performing successive trough or crest folding, which affects the accuracy and quality of the folding process.
Innovation Solution
The apparatus includes a conveying roller pair and first and second folding roller pairs arranged with a predetermined gap, where the sheet conveying speed or amount differs between the conveying roller pair and the folding roller pairs, ensuring that the folded sheet is guided and folded without displacement by maintaining a consistent tension state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sheet conveying speed of the conveying roller pair is made equal to the sheet conveying speed of the folding roller pairs, then the sheet transfer is smooth, but displacement of the folded sheet occurs during transfer between rollers
Solution Approach 1:
The patent applies dynamics by making the conveying roller pair and folding roller pairs operate at different speeds during the transfer process. The conveying roller pair operates faster to maintain tension and prevent displacement, while the folding roller pairs operate at their required speed for proper folding. This dynamic speed differentiation resolves the contradiction between transfer stability and folding accuracy.
2Reliability
If the conveying roller pair operates faster than the folding roller pairs, then sheet displacement is prevented, but excessive tension may cause sheet damage
Solution Approach 1:
The patent applies parameter changes by carefully controlling the speed differential between the conveying roller pair and folding roller pairs. The conveying roller pair operates at a higher speed to maintain proper tension and prevent displacement, but the speed difference is optimized to avoid excessive tension that could damage the sheet. This parameter optimization resolves the contradiction between preventing displacement and avoiding sheet damage.
Data Source
AI summary
A sheet folding apparatus including a conveying roller pair, first and second folding roller pairs, and a control unit. The control unit controls the apparatus such that a sheet conveying speed or a sheet conveying amount of the conveying roller pair is different from a sheet conveying speed or a sheet conveying amount of the first folding roller pair or the second folding roller pair when the folded part of the folded sheet is guided between the first folding roller pair and the second folding roller pair.