Banknote Handling Device Transparent Part Detection
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Solution Overview
Problem
Existing banknote handling devices face challenges in accurately detecting the end of polymer banknotes with transparent parts, leading to erroneous detection and handling issues, especially when the transparent part is not at the end of the banknote or when the banknote's condition changes due to wear or design variations.
Innovation Solution
A paper sheet handling device equipped with a mechanical detection sensor featuring a pair of rolling bodies that detect the displacement of the paper sheet, allowing for accurate detection of the end regardless of transparent parts, combined with an optical detection sensor to correct and confirm the detection results, ensuring precise handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transmissive optical banknote detection sensor is used to detect banknotes, then the detection process is simple and fast, but erroneous detection occurs when transparent parts are present on the banknote
Solution Approach 1:
The patent divides the detection task into two segments: a mechanical detection sensor (pair of rolling bodies) detects the physical presence and end position of the banknote, while an optical detection sensor detects light transmission characteristics. By segmenting the detection functions, the system achieves both fast optical detection and accurate mechanical verification, resolving the contradiction between detection speed and accuracy when transparent parts are present.
Solution Approach 2:
The mechanical detection sensor acts as an intermediary between the optical detection sensor and the control unit. When the optical sensor detects potential banknote presence, the mechanical sensor verifies the actual physical presence, especially important when transparent parts might cause false optical readings. This intermediary verification mechanism eliminates erroneous detection while maintaining fast optical screening.
2Measurement precision
If multiple optical detection sensors are arranged to detect transparent parts, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The patent extracts the function of detecting physical presence from the optical detection system and assigns it to a separate mechanical detection sensor (pair of rolling bodies). This extraction simplifies the overall system by removing the need for complex multi-sensor optical arrangements, while still achieving accurate detection of both banknote presence and transparent parts through the combination of mechanical and optical sensors.
3Measurement precision
If the optical axis of the detection sensor is inclined to detect transparent parts, then transparent part detection is enabled, but light reception amount decreases
Solution Approach 1:
The patent replaces the optical inclination method with a mechanical detection system (pair of rolling bodies) that physically contacts the banknote to detect its presence and end position. This mechanical substitution eliminates the need to incline the optical axis, maintaining optimal light reception efficiency while still enabling accurate detection of transparent parts through the mechanical sensor's physical interaction with the banknote.
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 enables accurate detection of the end of paper sheets with transparent parts, preventing erroneous handling and adapting to various banknote conditions, thus improving the reliability of banknote handling processes.
Implementation Method 1
a detection unit detecting a displacement of the rolling body when the paper sheet passes between the pair of rolling bodies facing each other in order to detect the end of the paper sheet
Implementation Method 2
an optical detection sensor that detects the paper sheet based on light transmitted through or blocked by the paper sheet
Data Source
AI summary
A paper sheet handling device (a banknote handling device) includes a paper sheet detection device (a tracking sensor) configured to detect a paper sheet, and a handling unit performing handling related to the paper sheet based on the time when the paper sheet detection device detects an end of the paper sheet. The paper sheet detection device includes a pair of rolling bodies (rollers) facing each other, disposed on a transport path transporting the paper sheet, and configured so that the paper sheet passes therebetween, and a detection unit detecting displacement of the rolling bodies when the paper sheet passes between the pair of rolling bodies to detect the paper sheet.