Sheet Processing Pressing Member Tilting to Eliminate Marks
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Solution Overview
Problem
Existing sheet processing apparatuses cause damage such as pressurized marks when reinforcing the folding line of center-folded booklets due to the restoration force and tilting of the roller shaft, which cannot be completely eliminated by tilting the roller relative to the folding line direction.
Innovation Solution
A sheet processing apparatus with a pressing member that moves in the folding line direction and pressurizes the downstream side of the sheet bundle, using an additional folding roller unit with a guiding mechanism to apply pressure without contacting the edges, thereby reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the roller is tilted with respect to the folding line direction to eliminate pressurized marks, then the effectiveness of eliminating bulge is improved, but the roller shaft line may tilt relative to the booklet surface causing edge pressurization and pressurized marks
Solution Approach 1:
The invention introduces a new dimension of control by independently tilting the roller shaft line relative to the folding line direction. Instead of only tilting the roller axis, the shaft line is tilted at a specific angle (e.g., 15-30 degrees) to the folding line, creating a dimensional change in the pressurization approach that allows the pressurizing force to be applied in an optimal direction that prevents both bulge and pressurized marks
Solution Approach 2:
The invention changes the angular parameter of the roller shaft line orientation. By adjusting the shaft line angle relative to the folding line direction within a specific range, the pressurization effect is optimized to eliminate bulge while avoiding edge pressurization. This parameter change allows dynamic adaptation to different booklet configurations
2Reliability
If the roller pressurizes the folding line portion while moving along the back of the booklet, then the additional folding work is performed, but the restoration force causes the folding line to bulge out and creates pressurized marks
Solution Approach 1:
The invention applies asymmetric pressurization by tilting the roller shaft line at a specific angle to the folding line direction. This creates an asymmetric distribution of pressurizing force where the downstream side experiences greater pressure than the upstream side, effectively counteracting the restoration force that causes bulging while preventing uniform pressurization that would create marks
Solution Approach 2:
The invention applies preliminary anti-action by positioning the roller to pressurize the folding line in a direction that counteracts the restoration force before the bulge can fully develop. The tilted shaft line configuration pre-establishes the optimal pressurization angle to prevent the harmful effect of bulging from occurring in the first place
Data Source
AI summary
The present invention is concerning to a sheet processing apparatus comprising: a pressing member configured to press a folding line portion of a sheet bundle being folded; and a moving unit configured to move the pressing member to a folding line direction of the sheet bundle, wherein the pressing member pressurizes a part of the sheet bundle corresponding to a downstream side of a conveyance direction of the sheet bundle.