Post-Processing Device Paper Jam Retry Timing
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Solution Overview
Problem
In image forming systems, paper jams during post-processing can lead to increased user burden and reduced productivity, as retrying conveyance without proper suspension can cause further jams and complicate processing.
Innovation Solution
A post-processing device with a conveyance unit, detection unit, and retrial judgment unit that predicts when it is safe to retry conveyance, ensuring the beginning sheet of a new set is not ejected until the previous jammed sheet is fully cleared, thereby preventing additional jams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conveyance is always retried without suspension of the system, then the processing burden on users is reduced and productivity is improved, but another paper jam occurs because the beginning sheet contacts the sheet stack under retrial
Solution Approach 1:
The system performs preliminary timing prediction to determine whether retrial is feasible before executing the retrial operation. The retrial judgment unit calculates the first time (when the beginning sheet will arrive at the storage tray) and the second time (when ejection of the jammed sheet stack will be complete), and only permits retrial if the first time is no earlier than the second time, preventing the beginning sheet from contacting the jammed sheet stack
Solution Approach 2:
The system uses feedback from the detection unit that detects paper jams during conveyance processing, and feeds this information to the retrial judgment unit which predicts timing and determines whether to permit retrial. This closed-loop feedback mechanism ensures that retrial operations are made based on real-time system state and predicted timing, preventing secondary jams
2Reliability
If the system is halted when a paper jam is detected, then the paper jam can be properly addressed, but processing burden increases and productivity deteriorates due to manual intervention required
Solution Approach 1:
The system performs self-service by automatically detecting paper jams through the detection unit, predicting timing through the retrial judgment unit, and autonomously deciding whether to retry conveyance through the retrial control unit. This eliminates the need for manual intervention and system halts, allowing the system to handle paper jams independently and maintain productivity
Data Source
AI summary
A post-processing device receives sheets ejected one by one from an image forming device, stores, in a storage tray, a number of sheets included in one set on which post processing is to be performed at a post-processing position at once, performs conveyance processing of one stored set of a sheet stack to the post-processing position, ejects the sheet stack to an ejection unit, detects a paper jam of the sheet stack during conveyance processing, when detecting the paper jam, predicts a first time when a beginning sheet of a subsequent ejected set arrives at the storage tray and a second time when the sheet stack with the paper jam is completely ejected in case of retrying conveyance processing, judges that retrial of conveyance processing is possible when the first time is no earlier than the second time, and when judging that the retrial is possible, retries conveyance processing.