Sheet Processing Apparatus Belt Projection Control
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Solution Overview
Problem
Conventional sheet processing apparatuses disarray the end part of stacked sheets during reverse rotation of the discharge roller, as the elastic finger lifts the rear end of the sheet, leading to improper stacking.
Innovation Solution
A sheet processing apparatus with a conveying portion, intermediate stacking portion, stopper, and pair of discharge rollers, where an endless belt with a varying outer peripheral surface projection is used to guide and stack sheets, ensuring the end part is held during normal rotation and not disarrayed during reverse rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the discharge roller rotates reversely to switchback the sheet on the intermediate processing tray, then the sheet can be repositioned, but the elastic finger lifts the rear end of the stacked sheet causing disarray
Solution Approach 1:
The harmful elastic finger is extracted and removed from the system. Instead of using an elastic finger that causes sheet disarray during reverse rotation, the patent employs a flat belt without protruding elements that contacts the sheet only during normal rotation for controlled discharge, eliminating the disarray problem while preserving repositioning capability
Solution Approach 2:
The patent inverts the approach by using a flat belt that rotates in the opposite direction during reverse operation. During normal rotation, the belt discharges sheets; during reverse rotation, the belt moves in the opposite direction without lifting sheet ends, thus preventing disarray while maintaining switchback functionality
2Manufacturing precision
If the elastic finger is used to hold the sheet during normal rotation, then the sheet end part can be held, but the sheet end part is disarrayed during reverse rotation
Solution Approach 1:
The harmful elastic finger is extracted and removed from the system. Instead of using an elastic finger that causes sheet disarray during reverse rotation, the patent employs a flat belt without protruding elements that contacts the sheet only during normal rotation for controlled discharge, eliminating the disarray problem while preserving positioning accuracy
Solution Approach 2:
The flat belt acts as an intermediary element between the discharge roller and the sheet. During normal rotation, it provides controlled contact for precise positioning; during reverse rotation, it withdraws contact to prevent harmful effects, thus mediating between positioning requirements and disarray prevention
Data Source
AI summary
In a conveying belt that is entrained about a pair of bundle discharge rollers along a stacking wall, on which an end part of a sheet stacked on a stack tray abuts, between the stack tray and an intermediate processing tray, a position of an outer peripheral surface is displaced such that a projection amount of the conveying belt from the stacking wall is large when the pair of discharge rollers discharges the sheet to the stacking portion, and such that the projection amount is small when the pair of discharge rollers moves the sheet toward a stopper of the intermediate stacking portion.