Sheet Folding Pushing Member Asymmetry to Prevent Score Reversion
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Solution Overview
Problem
Existing sheet processing apparatuses face issues with back cracking when folding thick coated paper, as the scoring process can lead to score reversion, where the folding score is collapsed, rendering the scoring ineffective in preventing back cracking.
Innovation Solution
A sheet processing apparatus with a pushing member that adjusts its position relative to the folding score, ensuring the center of the abutting portion does not coincide with the center of the score, thereby shifting the force from bending to compressing, reducing score reversion and back cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the convex portion of the folding score is pushed into the roller nip by the pushing member to place it inside the folded sheet, then the scoring can prevent back cracking, but score reversion occurs where the convex portion is collapsed by the pushing member
Solution Approach 1:
The pushing member is designed with an asymmetric abutting portion where the center does not coincide with the center of the folding score. This asymmetric configuration shifts the pushing force distribution, allowing the convex portion of the score to be pushed into the roller nip without being collapsed, thereby preventing both back cracking and score reversion
Solution Approach 2:
The invention changes the positional parameter of the abutting portion center relative to the folding score center. By adjusting this positional relationship, the pushing force is optimally distributed to achieve the desired effect of placing the convex portion inside the folded sheet while maintaining score integrity
2Strength
If a scoring process is carried out to squeeze the folding line portion in advance to prevent back cracking, then back cracking can be prevented, but the convex portion of the score may be collapsed during folding
Solution Approach 1:
The asymmetric positioning of the abutting portion center relative to the score center creates a non-uniform force distribution during pushing. This asymmetric force application allows the convex portion to be guided into the folded sheet without being collapsed, maintaining both the strength benefit and structural stability
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
This configuration effectively reduces score reversion and back cracking by altering the force distribution during folding, ensuring a more stable and accurate folding process, especially with thick coated papers.
Implementation Method 1
a pushing member configured to push the sheet with an abutting portion of the pushing member in order to fold the sheet on the supporting portion
Data Source
AI summary
Disclosed is a sheet processing apparatus which includes: a supporting portion in which a sheet which has been conveyed is stacked; a pushing member configured to push the sheet with an abutting portion of the pushing member in order to fold the sheet supported on the supporting portion; and a setting portion configured to set a pushing position at which the pushing member pushes the sheet with a score to a position at which the sheet is to be folded at the score, wherein a center of the abutting portion does not coincides with a center of the score of the sheet.