Tape Direction Detection in Banknote Circulation Devices
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Solution Overview
Problem
In circulation-type banknote storing devices, manual rotation to remove jams can lead to incorrect winding direction of tapes on the drum, causing further jams or device failure due to insufficient tape remaining, as operators may continue rotating without noticing the tape has been fully fed.
Innovation Solution
A paper sheet circulation device with a travelling-direction mark on the tape and a detection system to determine the tape's direction, ensuring proper winding by identifying the correct rotation direction based on the tape's travel pattern and drum rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual rotation is performed to remove jams, then jam removal is achieved, but incorrect winding direction occurs causing device failure
Solution Approach 1:
The system uses a sensor to detect the position of marks on the tape and provides feedback signals to the control unit. This feedback mechanism enables the system to automatically adjust the drum rotation direction based on the detected tape end position, preventing incorrect winding direction after manual jam removal operations.
Solution Approach 2:
The system automatically determines the tape end position and controls the drum rotation direction without requiring operator intervention. The control unit self-adjusts the winding direction based on sensor detection, eliminating the risk of human error in manual operations.
2Productivity
If drum rotation continues without monitoring tape remaining, then jam removal is completed, but tape is fully fed causing reverse winding
Solution Approach 1:
The system performs preliminary detection of the tape end position using marks on the tape before the tape is fully fed. By detecting the mark position in advance, the system can prepare to stop or reverse the drum rotation, preventing reverse winding from occurring.
Solution Approach 2:
The sensor continuously monitors the tape position by detecting marks, providing real-time feedback to the control unit. This enables the system to respond immediately when the tape approaches its limit, preventing over-rotation and reverse winding.
3Device complexity
If tape end detection is not implemented, then device structure remains simple, but incorrect winding direction causes device failure
Solution Approach 1:
The system uses optical marks (light-shielding regions) on the tape that can be detected by optical sensors. These marks create detectable changes in light transmission, enabling reliable tape end detection without complex mechanical or electronic systems.
Solution Approach 2:
The marks on the tape serve as intermediaries between the physical tape and the detection system. These simple optical markers enable the sensor to detect tape position and the control unit to determine winding direction without requiring direct complex interaction between the sensor and tape material.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents device failures by accurately determining the tape's winding direction, preventing reverse winding and ensuring smooth operation by automatically correcting the rotation direction when necessary.
Implementation Method 1
a mark detection sensor that detects the travelling-direction mark and outputs a detection signal
Data Source
AI summary
To prevent a failure or the like caused by winding of a tape in a reverse direction to a proper direction, a paper sheet circulation device includes a travelling-direction mark having a pattern that is formed along a travelling-direction of a detection tape and indicates the difference of the travelling-direction of the tape, and a sensor module that detects the travelling-direction mark and outputs a detection signal. The paper sheet circulation device determines a travelling-direction of the tape from a pattern signal in accordance with the travelling-direction of the tape acquired on the basis of a temporal change of the detection signal, and determines a winding direction of the tape on a drum from the travelling-direction of the tape and a rotation direction of the drum.