Sheet Handling Apparatus Dynamic Detection Thresholds
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Solution Overview
Problem
Conventional sheet handling apparatuses fail to correctly detect the leading and trailing edges of polymer banknotes with window parts, leading to incorrect detection and potential misidentification due to the high transmittance of the window area, and also struggle with banknotes having faint printing colors.
Innovation Solution
The apparatus employs a second-type detection unit with adjustable output levels and threshold values, specifically configured to differentiate between ordinary and windowed banknotes by altering the sensor sensitivity and emission intensity, allowing accurate detection of banknote edges and types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photoelectric sensor uses a fixed detection threshold to detect banknotes, then ordinary banknotes can be detected reliably, but polymer banknotes with window parts cannot be detected correctly due to high light transmittance
Solution Approach 1:
The patent applies dynamics by making the detection threshold adjustable rather than fixed. The control unit dynamically changes the detection threshold based on the banknote type being processed. For polymer banknotes with window parts, a lower threshold is used to account for the high light transmittance, while for ordinary banknotes, a higher threshold is used. This dynamic adjustment resolves the contradiction between maintaining reliable detection for ordinary banknotes and adapting to the unique characteristics of polymer banknotes.
Solution Approach 2:
The patent applies parameter changes by modifying the detection threshold parameter according to the banknote type. The control unit receives information about the banknote type (ordinary or polymer with window parts) and accordingly adjusts the detection threshold parameter of the photoelectric sensor. This parameter change enables the sensor to correctly detect both types of banknotes despite their different optical properties.
2Adaptability or versatility
If the detection threshold is lowered to detect polymer banknotes with window parts, then windowed banknotes can be detected, but leading and trailing edges may not be detected correctly when the window part is close to the edge
Solution Approach 1:
The patent applies segmentation by dividing the detection process into two independent stages: first detecting the presence of the banknote body (including window parts) using a lower threshold, and then detecting the leading and trailing edges using a higher threshold. This segmentation allows the system to correctly identify edge positions even when the window part is close to the edge, because the edge detection is performed separately from the body detection and is not affected by the high transmittance of the window part.
Solution Approach 2:
The patent applies dynamics by using different detection thresholds for different detection purposes. The control unit switches between a lower detection threshold for identifying the presence of polymer banknotes with window parts and a higher detection threshold for accurately detecting leading and trailing edges. This dynamic threshold switching resolves the contradiction between detecting windowed banknotes and maintaining edge detection precision.
3Device complexity
If a single detection method is used for all banknotes, then the device complexity is low, but detection accuracy varies for different banknote types
Solution Approach 1:
The patent applies universality by making the photoelectric sensor system multi-functional. The same photoelectric sensor can detect both ordinary banknotes and polymer banknotes with window parts, as well as detect both the body presence and the leading/trailing edges of banknotes. The control unit provides intelligence to switch between different detection modes and thresholds, enabling one sensor to perform multiple detection functions accurately without requiring separate sensors for each banknote type.
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
This solution enables precise detection of banknotes regardless of their type, including polymer banknotes with window parts and those with faint printing, by adjusting the detection settings based on the banknote's characteristics, thereby improving the accuracy of edge detection and reducing errors.
Implementation Method 1
The photoelectric sensor comprises a light receiving unit and a light emitting unit, and the light receiving unit detects detection light emitted from the light emitting unit
Implementation Method 2
the light receiving unit detects detection light emitted from the light emitting unit. The photoelectric sensor detects a transported banknote on the transport path by detecting a change of the detecting light
Data Source
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AI summary
One object is to correctly detect a sheet depending on a characteristic of the sheet transported on a transport path. A sheet handling apparatus includes a transport unit that transports a sheet along a transport path, a detection unit that detects the sheet transported by the transport unit, and a control unit that changes a setting of the detection unit based on a type of the sheet transported by the transport unit.