Sheet Punching Unit Position Control for Width Deviation
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Solution Overview
Problem
Existing sheet processing apparatuses face challenges in efficiently punching sheets due to alignment issues and size variations, leading to reduced processing speed and potential interference between the punching unit and the sheet, especially when sheets deviate in width during conveyance.
Innovation Solution
A sheet processing apparatus equipped with a conveyance unit, a punching unit, a movement unit, and a detection unit that compares the detected conveyance position with a reference position to determine if an avoidance process is necessary, allowing the punching unit to move away from the sheet to prevent interference, ensuring accurate punching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the punching unit is positioned in advance based on preset sheet size, then punching accuracy is improved, but sheet interference occurs when sheets deviate in width
Solution Approach 1:
The punching unit moves to a predetermined position in advance based on the detected sheet width, preparing for accurate punching before the sheet arrives. This preliminary positioning action enables the system to achieve punching accuracy while avoiding interference by adjusting the position based on actual sheet dimensions detected beforehand.
Solution Approach 2:
The punching unit's position is dynamically adjusted based on the detected sheet width. Rather than being fixed at a preset position, the punching unit moves to an optimized position that adapts to the actual sheet dimensions, thereby maintaining punching accuracy while preventing interference with sheets of varying widths.
2Productivity
If sheets are conveyed one at a time, then apparatus size is reduced and processing speed is maintained, but alignment mechanisms are eliminated requiring alternative positioning solutions
Solution Approach 1:
The patent replaces mechanical alignment mechanisms with an optical detection system. A detection unit measures the sheet width and position, and this information is used to control the punching unit's position electronically, eliminating the need for complex mechanical alignment devices while maintaining high processing speed.
3Speed
If the punching unit stands by at a predetermined position, then punching readiness is improved, but contact with deviated sheets occurs causing conveyance stoppage
Solution Approach 1:
The system continuously detects the sheet width and position, and uses this feedback information to adjust the punching unit's position. This closed-loop control ensures the punching unit is ready to punch accurately while avoiding contact with sheets that deviate from the standard position, thereby maintaining both punching readiness and conveyance continuity.
Data Source
AI summary
A sheet processing apparatus includes: a punching unit configured to punch a sheet conveyed; a movement unit configured to cause the punching unit to move in a direction intersecting with a conveyance direction of the sheet; a detection unit configured to detect a first conveyance position which is a position in a width direction orthogonal to the conveyance direction of the sheet; and a control unit configured to obtain size information of the sheet, determine, based on the size information, a second conveyance position in the width direction when the sheet is conveyed, and by comparing the first conveyance position and the second conveyance position, control whether or not to execute an avoidance process that causes the punching unit to move away from the sheet.