Printer Paper Jam Handling via Segmented Conveyance Control
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Solution Overview
Problem
Printers face significant user burden when paper jams occur, as many sheets remain inside the machine, requiring extensive manual removal.
Innovation Solution
A printer design incorporating a main conveyor, a circulation conveyor, and a controller that stops paper conveyance upstream of a jam and discharges sheets downstream, reducing the number of remaining sheets and narrowing their spread, thereby minimizing the effort required for paper jam release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the paper conveyance stops completely upon paper jam occurrence, then the paper jam can be detected and handled, but many sheets remain inside the machine requiring extensive manual removal
Solution Approach 1:
The paper conveyance system is divided into multiple independent conveyance paths: a main conveyance path and a circulation conveyance path. When a paper jam occurs, only the affected path is stopped while other paths continue operating. This segmentation allows the system to maintain partial functionality and reduces the number of sheets remaining in the machine, thereby reducing manual removal work.
Solution Approach 2:
The system dynamically adjusts the operation state of different conveyance paths based on real-time paper jam detection. Instead of a static stop-all-operations approach, the controller selectively stops only the affected conveyance path while keeping others active, optimizing both reliability and ease of operation.
2Productivity
If the circulation conveyer continues operating during paper jam on main conveyer, then productivity is maintained, but sheets may spread over longer distance
Solution Approach 1:
The circulation conveyer is segmented into multiple independent drive sections. When a paper jam is detected on the main conveyer, the controller stops only the necessary sections of the circulation conveyer while allowing other sections to continue operating. This selective stopping maintains productivity for non-affected sheets while limiting the spread range of remaining sheets to a manageable distance.
Solution Approach 2:
Instead of stopping the entire circulation conveyer, only the minimum necessary sections are stopped to handle the paper jam situation. This partial action approach maintains overall productivity while sufficiently limiting the spread of remaining sheets.
Data Source
AI summary
Upon occurrence of a paper jam on a main conveying route, a controller performs control of stopping paper conveyance at a section of the main conveying route upstream of a position of the paper jam in a conveying direction and discharging sheets at a section of the main conveying route downstream of the position of the paper jam in the conveying direction, and performs control of stopping paper conveyance at a circulation conveying route. Upon occurrence of a paper jam on the circulation conveying route, a controller performs control of stopping paper conveyance at a section of the circulation conveying route upstream of a position of the paper jam, and performs control of discharging sheets at a section of the circulation conveying route downstream of the position of the paper jam and at the main conveying route.