Sheet Post-Processing Device Curl Suppression
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Solution Overview
Problem
Existing sheet post-processing devices face challenges in suppressing curl and pushing out of sheet bundles during discharge, while maintaining processing efficiency, especially when dealing with varying numbers of sheets in a bundle.
Innovation Solution
The device incorporates a discharge roller pair and a reciprocatable bundle discharge member, with a control system that adjusts the discharge method based on the number of sheets in the bundle, using the discharge roller pair for smaller bundles and the bundle discharge member for larger ones, and includes a lifting-lowering mechanism for the loading tray to manage curl and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the discharge roller pair is used to discharge sheet bundles, then processing efficiency is improved, but curl and pushing out of sheet bundles cannot be suppressed
Solution Approach 1:
The patent applies dynamics by making the discharge mechanism adaptable - using discharge rollers for small bundles and a bundle discharge member for large bundles. The system dynamically selects the appropriate discharge method based on bundle size, allowing both high-speed discharge for small bundles and reliable curl suppression for large bundles
2Reliability
If the bundle discharge member is used to discharge sheet bundles, then curl and pushing out are suppressed, but processing efficiency decreases
Solution Approach 1:
The system dynamically selects between two discharge methods based on bundle size. The bundle discharge member is used specifically for large bundles where curl suppression is critical, while the discharge rollers handle small bundles for high efficiency, optimizing overall system performance
3Manufacturing precision
If the loading tray is lifted above the reference position, then alignment and curl control are improved, but device complexity increases
Solution Approach 1:
The loading tray is preliminarily positioned (lifted) before the bundle discharge operation to prevent curl and ensure proper alignment during discharge. This preliminary positioning action ensures that when large bundles are discharged, they land correctly without curling or pushing out
Data Source
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AI summary
A sheet post-processing device (5) includes a processing tray (8), a post-processing mechanism (61, 62), a discharge roller pair (73), a bundle discharge member (81), a loading tray (11), a sheet holding member (14), a discharge drive portion (90), a tray lifting-lowering drive portion (113), a sheet holding drive portion (142), and a control portion (100). In a case where a number A of sheets included in a sheet bundle loaded on the processing tray (8) is smaller than a predetermined number A1, the control portion (100) discharges the sheet bundle onto the loading tray (11) by using the discharge roller pair (73), with the loading tray (11) arranged at a reference position. In a case where the number A of the sheets included in the sheet bundle is equal to or larger than the predetermined number A1, the control portion (100) discharges the sheet bundle onto the loading tray (11) by using the bundle discharge member (81), with the loading tray (11) having been lifted above the reference position.