Banknote Conveyance Detection Using Dual Position Sensors
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Solution Overview
Problem
Conventional banknote processing devices face unreliable detection results when attempting to determine if a banknote has been withdrawn, particularly due to the small size of foreign matters like strings or belts, which can lead to unnecessary losses.
Innovation Solution
A banknote processing device equipped with a banknote recognition mechanism, first and second position sensors, and a control mechanism that determines the conveyance status by detecting the banknote's presence at specific positions within predetermined times, ensuring reliable detection of banknote withdrawal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a light-emitting component and reflector are used to detect foreign matter on the banknote, then the detection of foreign matter is enabled, but the detection reliability deteriorates because the detected area is small and the light may not irradiate the foreign matter
Solution Approach 1:
The patent divides the detection function into two independent parts: the banknote recognition mechanism handles authenticity verification, while the position sensors handle conveyance status detection. This segmentation allows each component to optimize its specific function without interference, improving overall detection reliability.
Solution Approach 2:
The patent introduces position sensors as intermediary devices to detect the banknote's conveyance status. These sensors act as mediators between the banknote recognition mechanism and the control mechanism, providing reliable information about whether the banknote has been successfully conveyed without directly detecting foreign matter.
2Area of stationary object
If the distance between position sensors is large to cover more detection area, then the detection coverage is improved, but the response time deteriorates because the banknote may leave the detection zone
Solution Approach 1:
The patent applies local quality by positioning sensors at specific critical locations along the conveyance path rather than uniformly distributing them. The first position sensor is placed near the banknote recognition mechanism to detect successful recognition, while the second position sensor is placed downstream to detect abnormal withdrawal. This localized positioning optimizes both detection coverage and response time.
Solution Approach 2:
The patent implements preliminary action by setting predetermined time thresholds before actual detection occurs. The control mechanism compares the actual time elapsed between sensor detections against these pre-calculated thresholds to determine abnormal withdrawal, allowing for timely detection without requiring excessive sensor spacing.
3Device complexity
If only a single position sensor is used to detect banknote presence, then the device complexity is reduced, but the measurement precision deteriorates because the conveyance status cannot be accurately determined
Solution Approach 1:
The patent segments the detection function into multiple sensors positioned at different locations along the conveyance path. The first position sensor detects when the banknote enters the recognition zone, while the second position sensor detects when it leaves. This segmentation enables precise determination of conveyance status without requiring complex sensor arrays.
Solution Approach 2:
The patent implements feedback by continuously monitoring the time elapsed between the first and second position sensor detections and comparing it against predetermined time thresholds. This feedback mechanism allows the control mechanism to accurately determine whether the banknote has been successfully conveyed or abnormally withdrawn, improving measurement precision.
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
The solution significantly enhances the detection reliability of banknote withdrawal, preventing misjudgments and unnecessary losses by accurately tracking the banknote's movement through the system.
Implementation Method 1
a first position sensor, which is arranged on a banknote passage, downstream the banknote recognition mechanism, and is configured to detect whether the banknote reaches a first position in the banknote passage
Implementation Method 2
a second position sensor, which is arranged on the banknote passage, downstream the first position sensor, and is configured to detect whether the banknote reaches a second position in the banknote passage
Implementation Method 3
a banknote recognition mechanism, which is configured to detect the authenticity of a banknote
Data Source
AI summary
The disclosure provides a method for detecting the conveyance status of a banknote, comprising; detecting whether the banknote reaches a first position in a banknote passage within a first predetermined time; detecting whether the banknote reaches a second position in the banknote passage within a second predetermined time when it is determined that the banknote has reached the first position (S14); determining whether the status of the banknote at the first position is changed from Banknote Detected to Banknote Undetected when it is determined that the banknote is withdrawn when it is determined that the status of the banknote at the first position has changed from Banknote Detected to Banknote Undetected (S18). This application can increase the possibility of the banknote processing device in detecting whether the banknote is withdrawn. Meanwhile, the disclosure provides a device for processing a banknote.