Sheet Processing Device Stitching Control for Staple-Free Bundles
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Solution Overview
Problem
Conventional image forming systems face inefficiencies in sheet processing due to the need to switch from temporary to permanent stitching units when the number of output sheets exceeds the allowable limit, leading to increased processing time and reduced productivity, especially when users do not want to use metallic staples.
Innovation Solution
A sheet processing device with a selecting unit that chooses between permanent and temporary stitching units based on the number of sheets to be stitched, allowing the temporary stitching unit to adjust the number of stitched areas, thereby optimizing processing time and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the temporary stitching unit is used for a large number of sheets, then resource saving and recycling efficiency are improved, but processing time increases significantly
Solution Approach 1:
The stitching process is segmented into multiple passes. The temporary stitching unit performs stitching in divided sections rather than attempting to stitch all sheets at once. This allows the system to handle large sheet bundles using the resource-efficient temporary stitching unit while maintaining acceptable processing times by working in segments.
2Loss of substance
If the temporary stitching unit is used, then metallic staples are saved and recycling efficiency is improved, but the allowable number of stitching-processed sheets is limited to about 5
Solution Approach 1:
The sheet bundle is divided into multiple groups that can be processed separately by the temporary stitching unit. Each group contains a manageable number of sheets (within the ~5 sheet limit), and the stitching operation is performed sequentially across all groups, enabling the temporary stitching unit to handle large total sheet bundles through divided processing.
Solution Approach 2:
The system dynamically adjusts the stitching strategy based on the total number of sheets. When the sheet count exceeds the temporary stitching unit's capacity, the system automatically switches to a multi-pass segmented stitching approach, allowing the temporary stitching unit to adaptively handle larger volumes without requiring metallic staples.
3Adaptability or versatility
If the permanent stitching unit is used when sheets exceed temporary stitching capacity, then the allowable number of stitching-processed sheets is increased, but metallic staples are consumed and user intent is violated
Solution Approach 1:
Instead of switching to the permanent stitching unit with metallic staples, the system segments the large sheet bundle into smaller groups and processes them sequentially using the temporary stitching unit. This maintains the user's preference for staple-free stitching while achieving the capability to handle large sheet volumes through divided processing.
4Reliability
If the temporary stitching unit stitches multiple areas of a sheet bundle, then stitching tightness is improved, but processing time increases from 4-10 seconds
Solution Approach 1:
The sheet bundle is divided into multiple groups, and the temporary stitching unit performs stitching operations on each group sequentially. By processing fewer sheets at a time in each pass, the system achieves adequate stitching tightness for each segment while reducing the overall processing time compared to attempting to stitch all sheets simultaneously or stitching multiple areas of every sheet.
Data Source
AI summary
A sheet processing device includes: a stacking unit configured to stack a plurality of sheets to obtain a sheet bundle; a stitched-sheet number acquiring unit configured to acquire a number of sheets in the sheet bundle, which is a target to be stitched; a permanent stitching unit configured to permanently stitch the sheet bundle; a temporary stitching unit configured to be capable of temporarily stitching a plurality of areas of the sheet bundle; a selecting unit configured to select any one of the permanent stitching unit and the temporary stitching unit to be used; and a stitching-process control unit configured to, when the temporary stitching unit is selected by the selecting unit, control the temporary stitching unit so as to change a number of areas that are stitched by the temporary stitching unit.