Banknote Conveyance Reversal for Reliable Jam Clearance
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Solution Overview
Problem
Existing banknote handling apparatuses struggle to reliably detect and resolve jams in conveyance sections between adjacent sensors, leading to potential loss of banknotes due to undetected residual banknotes.
Innovation Solution
A banknote handling apparatus equipped with upstream and downstream sensors and a controller that reverses and forwards the conveyance path to confirm the resolution of jams by detecting banknotes at specific intervals, ensuring reliable detection of jam clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sensor-based jam detection is used, then the system is simple and fast, but it cannot reliably detect jams in conveyance sections between adjacent sensors
Solution Approach 1:
Instead of only detecting jams by sensing the presence of banknotes, the system inverts the approach by actively driving the conveyance path in reverse direction to attempt to move stuck banknotes and confirm jam resolution. This reverse driving action transforms the passive detection limitation into an active verification mechanism.
Solution Approach 2:
The system performs preliminary reverse driving action before terminating processing. By driving the conveyance path in reverse direction first, the system attempts to clear potential jams before making a final determination, ensuring that banknotes are not lost due to undetected residual jams in sensor gaps.
2Productivity
If the system terminates processing when sensors indicate no banknote presence, then processing is efficient, but banknotes may be lost due to undetected residual jams
Solution Approach 1:
Before terminating processing, the system performs a preliminary reverse driving action to ensure no banknotes are left in the conveyance path. This preliminary verification step prevents banknote loss while maintaining processing efficiency by avoiding unnecessary full-cycle operations.
Solution Approach 2:
The system uses feedback from sensors during reverse driving to determine whether banknotes are still present in the conveyance path. If sensors detect banknotes during reverse driving, the system continues driving; if not, it terminates processing, ensuring no banknotes are lost.
3Reliability
If reverse driving is performed to confirm jam resolution, then banknote loss is prevented, but processing time increases
Solution Approach 1:
The system performs a partial reverse driving action only for the duration needed to verify jam resolution, rather than completing a full conveyance cycle. This partial action is sufficient to confirm whether banknotes are still present while minimizing additional processing time.
Solution Approach 2:
The system uses real-time sensor feedback during reverse driving to determine when to stop. If sensors detect that banknotes have been successfully moved or the conveyance path is clear, the system terminates the reverse driving action early, reducing processing time while ensuring reliability.
Data Source
AI summary
A paper sheet handling apparatus includes an upstream sensor and a downstream sensor arranged on an upstream side and a downstream side of the conveyance path respectively, and detect the paper sheet, and a controller that controls the drive mechanism based on detection results of the upstream sensor and the downstream sensor. In a case where the upstream sensor detects the paper sheet conveyed and then the paper sheet is not detected by the downstream sensor, the controller controls the drive mechanism to drive the conveyance path in a reverse direction opposite to the conveyance direction and to drive the conveyance path in the conveyance direction after the upstream sensor detects the paper sheet again, and the controller determines that a conveyance abnormality, which has occurred in a conveyance section between the upstream sensor and the downstream sensor, has been resolved when the downstream sensor detects the paper sheet.