Punching Member Preliminary Movement for Sheet Processing
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Solution Overview
Problem
Existing sheet processing systems face challenges in performing successive punching operations on sheets with short intervals, especially when the punching positions of preceding and succeeding sheets are displaced or skewed, leading to inefficiencies in punching device movement and productivity.
Innovation Solution
A sheet processing apparatus with a controller that executes preliminary movement of the punching member in the sheet width direction before the end portion of the succeeding sheet reaches a detection position, allowing for precise alignment and efficient punching, even when the distance between punching positions exceeds a threshold, thereby improving productivity and reducing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the punching device waits for the succeeding sheet to reach the detection position before moving, then the punching position accuracy is improved, but the productivity deteriorates due to increased sheet interval
Solution Approach 1:
The punching device performs preliminary movement to a preliminary punching position before the succeeding sheet reaches the detection position. This advance action allows the device to be ready for punching earlier, reducing the sheet interval and improving productivity while maintaining punching accuracy through subsequent position adjustment based on detected sheet position
2Manufacturing precision
If the punching device moves to the exact punching position after sheet detection, then the punching position accuracy is improved, but the productivity deteriorates when sheet interval is short
Solution Approach 1:
The punching device moves to a preliminary punching position in advance before the sheet reaches the detection position. This preliminary action reduces the time needed for position adjustment after detection, allowing the device to minimize movement distance and time when the sheet arrives, thereby reducing time loss while maintaining punching accuracy
Solution Approach 2:
The punching device uses a two-stage movement system: first moving to a preliminary position, then adjusting to the final punching position based on detected sheet position. This dynamic approach allows the device to adapt its movement strategy based on timing and position requirements, optimizing both speed and accuracy
3Productivity
If the punching device performs preliminary movement early, then the productivity is improved by reducing sheet interval, but the punching position accuracy may deteriorate
Solution Approach 1:
The punching device moves to a preliminary punching position in advance, but maintains the capability to adjust to the final punching position after sheet detection. This two-stage approach ensures productivity improvement through early positioning while preserving accuracy through subsequent adjustment based on actual sheet position
Solution Approach 2:
The system uses sheet position detection to provide feedback that adjusts the punching device's final position. After preliminary movement, the detected sheet position information is used to calculate the required adjustment, ensuring the punching device reaches the exact punching position and maintains accuracy despite the preliminary movement
Data Source
AI summary
A sheet processing apparatus includes a sheet conveyance portion, a punching member, a punching member moving portion, a position detection portion, and a controller. In a case of performing a punching process on a preceding sheet and a succeeding sheet successively conveyed to a predetermined position, the controller is configured to execute preliminary movement after the punching process on the preceding sheet is finished and before an end portion position of the succeeding sheet in a sheet width direction that coincides with a first punching position of the succeeding sheet in a conveyance direction reaches the position detection portion. The first punching position is a position where the punching process is first performed on the succeeding sheet.