Post Processing Apparatus Curl Correction Control
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Solution Overview
Problem
Existing post processing apparatuses face challenges in accurately performing post processing on curled sheets, leading to degraded placement suitability due to complex device structures or reduced productivity from dedicated decurler mechanisms or tray movement limitations.
Innovation Solution
A post processing apparatus with a simple structure that includes a first placement unit, post processing unit, discharging unit, and control unit, which controls the post processing and discharge of sheets with curl corrections by prioritizing the discharge of convexly curled sheets first, allowing for efficient processing without a dedicated decurler mechanism and maintaining productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated decurler mechanism is used to correct curl of sheets, then placement suitability is improved, but device complexity increases
Solution Approach 1:
The patent removes the dedicated decurler mechanism from the system and replaces it with a control-based approach. The control unit detects curl states and selectively discharges sheets to the placement tray, extracting the decurling function from hardware and implementing it through intelligent control logic.
Solution Approach 2:
The system uses the sheets themselves as the decurling medium. By discharging convexly curled sheets first to the placement tray, the sheets' own curvature properties are utilized to press against and correct concavely curled sheets, making the system self-correcting without external mechanical intervention.
2Reliability
If the placement tray is moved close to the top plate to correct curl, then placement suitability is improved, but productivity deteriorates
Solution Approach 1:
The control unit performs preliminary detection of sheet curl states before discharge. By identifying which sheets are convexly curled and which are concavely curled in advance, the system can plan the discharge sequence to optimize both placement suitability and processing efficiency.
Solution Approach 2:
The system dynamically adjusts the discharge sequence based on real-time detection of sheet curl states. The control unit selectively discharges sheets based on their curvature properties, creating a dynamic processing approach that adapts to varying sheet conditions without requiring physical tray movement.
Data Source
AI summary
A post processing apparatus is attachable to an image forming apparatus. In a state in which a concavely curled recording material is placed on a second placement unit, when a plurality of the recording materials which are convexly curled are discharged to the second placement unit, a control unit causes a post processing unit to perform specified post processing on at least one recording material of the plurality of recording materials, causes a discharging unit to discharge the at least one recording material to the second placement unit, and after the discharge, causes the post processing unit to perform the specified post processing on the recording material or the recording materials of the plurality of recording materials other than the at least one recording material.