Sheet Edge Detection Timing Control for High-Speed Punching
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Solution Overview
Problem
Existing sheet processing apparatuses face limitations in increasing conveying speed due to delayed detection of sheet edges, particularly with smaller sheet sizes, which hampers performance and productivity.
Innovation Solution
A sheet processing apparatus with multiple detectors and a controller that adjusts the starting movement of edge detectors based on sheet size and conveying speed, selecting the most downstream detector for accurate edge detection, allowing for timely punching process execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conveying speed is increased to improve processing performance, then productivity is improved, but the time for the edge detector to reach the detection position becomes insufficient
Solution Approach 1:
The edge detector starts moving in the width direction before the trailing edge sensor detects the leading edge of the sheet. The controller calculates the optimal start timing based on sheet size and conveying speed, allowing the detector to be in position when the sheet arrives, thus eliminating detection delays while maintaining high conveying speeds
Solution Approach 2:
The system dynamically adjusts the edge detector's movement timing and position based on real-time parameters including sheet size and conveying speed. The controller modifies the detector's behavior adaptively, transitioning from a static fixed-timing system to a dynamic responsive system that optimizes detection for each sheet
2Adaptability or versatility
If the sheet size in the width direction becomes smaller, then adaptability is improved, but the movement distance from standby position to lateral edge increases
Solution Approach 1:
The edge detector begins moving in the width direction in advance based on predicted sheet parameters. For smaller sheets, the controller calculates the extended movement distance required and initiates motion earlier, ensuring the detector reaches the lateral edge position regardless of sheet size
Solution Approach 2:
The system changes the movement parameters of the edge detector based on sheet size. For smaller sheets with longer required movement distances, the controller adjusts the start timing and duration of the detector's movement to ensure adequate travel time to reach the lateral edge detection position
Data Source
AI summary
A sheet processing apparatus includes a first detector configured to detect a leading edge of a sheet conveyed in a conveying direction, a second detector provided on a downstream side of the first detector in the sheet conveying direction to detect the leading edge of the sheet conveyed, a punching portion, in the downstream side of the first detector in the sheet conveying direction, to move in a sheet width direction crossing the sheet conveying direction and perform a punching process for the sheet, an edge detector configured to move in the width direction together with the punching portion and detect the edge of the sheet conveyed in the width direction, and a controller, on the basis of at least either of information of a conveying speed of the sheet and a sheet length in the conveying direction, when the edge detector starts movement in the width direction after the first or second detector detects the leading edge of the sheet, to judge whether the edge detector can detect the edge of the sheet or not, as a result of the judgment, selecting the detector positioned on the most downstream side in the conveying direction among the first and second detectors which can be used, and when the selected first or second detector detects the leading edge of the sheet conveyed, permitting the edge detector to start movement to detect the edge of the sheet in the width direction.