Booklet Pressing Unit for Accurate Cutting Alignment
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Solution Overview
Problem
Conventional sheet processing apparatuses face issues with deflection and misalignment during the cutting process of bound booklets, leading to inaccurate trimming due to surface sheet deflection and movement during pressing and cutting.
Innovation Solution
A sheet processing apparatus with a conveying unit, a processing unit, and a holding unit that includes guide units with adjustable gap distances to align and stabilize the booklet before cutting, ensuring accurate alignment and minimizing deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conveying unit rotates the booklet while it is abutted on the positioning stopper, then the cutting process can be performed, but deflection of the surface sheet occurs causing misalignment at the edge
Solution Approach 1:
The invention performs preliminary pressing of the booklet before the cutting process. The pressing unit presses the booklet in the conveying direction to suppress deflection of the surface sheet, ensuring accurate alignment is maintained during the subsequent cutting operation
Solution Approach 2:
The invention introduces a pressing unit as an intermediary component between the conveying unit and the cutting unit. This pressing unit applies pressure to the booklet to suppress deflection, acting as a mediator that prevents the surface sheet from deflecting during the cutting process
2Stability of the object's composition
If pressing force is applied to hold the booklet, then deflection is suppressed, but the booklet may move in the edge surface direction causing inclined cut surfaces
Solution Approach 1:
The invention applies pressing force locally at the spine side of the booklet rather than uniformly across the entire booklet. The pressing unit is positioned to apply pressure specifically at the spine side, suppressing deflection without causing unwanted movement in the edge surface direction
Solution Approach 2:
The invention replaces the conventional approach of applying pressure from the edge surface direction with a pressing mechanism that applies force from the spine side. This mechanical substitution of the pressing direction eliminates the problem of inclined cut surfaces while maintaining booklet stability
3Shape
If the booklet is pressed to flatten bulges, then the cutting surface becomes flat, but the booklet may move back and forth and be pressed in a displaced state
Solution Approach 1:
The invention performs preliminary pressing of the booklet before the cutting process to flatten bulges and suppress deflection. By pressing the booklet in advance while it is held by the holding members, the invention ensures both flatness and accurate positioning are maintained
Solution Approach 2:
The invention merges the functions of the holding members and pressing unit to work simultaneously. The holding members hold the booklet in the correct position while the pressing unit applies pressure to flatten bulges, combining positioning and flattening operations to prevent displacement during cutting
Data Source
AI summary
A sheet processing apparatus includes a conveying unit that conveys a booklet formed by folding a sheet bundle; a processing unit that performs a predetermined process on the booklet; a booklet holding unit that includes first and second holding members to hold the booklet and varies a gap distance between the first and second holding members depending on a state of processing the booklet while the sheet processing unit is performing the process on the booklet; and a pressing unit that presses and fixes the booklet while the processing unit is processing the booklet.