ATM Drum Rotation Restriction Mechanism for Tape Jam Prevention
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Solution Overview
Problem
In Automatic Teller Machines (ATMs), the temporary retention section's drum rotation can lead to reverse-winding issues when the tape is unwound beyond its fixed portion, causing tape jams and reliability concerns.
Innovation Solution
A medium processing device with a circular cylinder drum and a tape wrapped around it, featuring a rotation restriction mechanism that prevents reverse-winding by using a stopper section to restrict drum rotation when the tape is unwound to its fixed portion, ensuring the tape does not wrap back onto the drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drum rotates in the unwind direction to discharge banknotes, then the tape is unwound and banknotes are discharged, but reverse-winding occurs when the tape start end portion is exposed
Solution Approach 1:
The rotation restriction mechanism is activated in advance when the tape start end portion is exposed. The stopper section engages with the restriction section to prevent the drum from rotating further in the unwind direction, thereby preemptively stopping the reverse-winding process before it can occur
Solution Approach 2:
The rotation restriction mechanism acts as an intermediary between the drum rotation and the tape unwinding process. It monitors the tape start end portion exposure and intervenes by restricting drum rotation when necessary, serving as a mediator that prevents the harmful reverse-winding effect
2Ease of operation
If the drum rotates in the opposite direction after reverse-winding to wrap banknotes, then banknotes can be wrapped onto the drum, but tape jams result
Solution Approach 1:
The rotation restriction mechanism prevents the drum from rotating in the opposite direction after reverse-winding has occurred. By engaging the stopper section with the restriction section, it blocks any attempt to rotate the drum in the wrapping direction, thereby preemptively preventing tape jams before they can occur
3Productivity
If the tape is unwound completely to expose the fixing portion, then maximum banknotes can be discharged, but reverse-winding occurs and reliability decreases
Solution Approach 1:
The rotation restriction mechanism provides feedback control by monitoring the position of the tape start end portion. When the tape start end portion is exposed, the mechanism detects this state and automatically engages the stopper section to restrict drum rotation, preventing reverse-winding and maintaining operational reliability while allowing maximum discharge capacity
Data Source
AI summary
A medium processing device includes: a drum that has a circular cylinder shape and that rotates about a rotation shaft; a tape that, together with a medium, is wrapped onto a drum circumferential face, this being a circumferential face of the drum; a reel onto which the tape is pre-wound, and from which the tape is pulled out accompanying rotation of the drum; and a rotation restriction mechanism. The rotation restriction mechanism includes a restriction section that is obstructed from moving by the tape wrapped onto the drum circumferential face, and that moves when the drum rotates in an unwind direction to unwind the tape such that the tape comes away from the drum circumferential face to expose a wrapping location of the tape onto the drum circumferential face, and a stopper section that abuts the restriction section so as to restrict rotation of the drum in the unwind direction.