Coin Validator Curved Guide Wall Stability
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Solution Overview
Problem
Conventional coin validation methods face issues with coin instability during transport, leading to variations in electromagnetic coupling and increased jamming risks, and require multiple sensors for reliable validation, limiting throughput.
Innovation Solution
A coin validator with a motor-driven rotor mechanism and an inclined coin chute with a radially outer curved guide wall, combined with a validation sensor module using electromagnetic and acoustic sensors, and a processor for Fast Fourier Transform analysis, ensures stable coin transport and efficient validation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coins are transported by rolling edgewise down an inclined sensing track, then the coin can be validated through electromagnetic coupling, but the coin becomes unstable and wobbles leading to variations in electromagnetic coupling
Solution Approach 1:
The patent employs a curved guide wall in the coin transport path that forces the coin to follow a curved trajectory. This curvature constraint stabilizes the coin's orientation during transport, preventing wobble and ensuring consistent electromagnetic coupling with the sensing coils. The curved path geometry is specifically designed to maintain the coin in a stable rolling motion rather than allowing it to tumble or wobble.
2Measurement precision
If the sensor region passageway is narrowed to reduce coin wobble, then electromagnetic coupling stability improves, but the likelihood of coins becoming jammed increases
Solution Approach 1:
The curved guide wall creates a controlled curvature in the coin's transport path that stabilizes the coin without requiring an excessively narrow passageway. This curvature-based stabilization method allows for a more generous passageway width compared to straight-line transport, thereby reducing jamming risks while maintaining electromagnetic coupling stability.
3Measurement precision
If discrete frequency analysis is used to detect various coin properties, then validation accuracy improves, but the number of sensor coils required increases
Solution Approach 1:
The patent employs a small number of sensing coils that are excited with multi-frequency signals. These same coils perform multiple detection functions by analyzing the coin's electromagnetic response across different frequencies. The system uses discrete frequency analysis on the output from a limited number of coils to extract multiple coin properties (material, size, orientation), making the sensing system multi-functional rather than requiring separate coils for each measurement.
4Measurement precision
If multiple sensor coils are used for discrete frequency analysis, then coin validation accuracy improves, but the speed of operation is limited
Solution Approach 1:
The system uses periodic multi-frequency excitation signals applied to the sensing coils. By using periodic signals at multiple discrete frequencies and analyzing the periodic response, the system can efficiently extract multiple coin properties in a single pass through the sensing region. This periodic multi-frequency approach allows accurate validation without requiring multiple sequential measurements, thereby maintaining high validation speed.
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 stabilizes coin transport, reduces jamming, and enhances validation efficiency by maintaining a fixed coin path and using multi-sensory analysis for accurate coin authentication and rejection.
Implementation Method 1
a radially outer curved guide wall, such that in operation a coin exiting the coin outlet gate and traversing the coin transport path is subjected to a centripetal acceleration that constrains the coin to follow and abut the contour of the radially outer curved guide wall
Implementation Method 2
undesirable coin-to-coin variations in the electromagnetic coupling between the sensing coils and the coin under test
Implementation Method 3
the coin diverter sensor comprises a light transmitter element adjacent to a corresponding light receiver element, both the light transmitter element and the light receiver element being disposed opposite a light-return arrangement
Data Source
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AI summary
A coin validator apparatus (4) includes an inclined coin chute (9) interconnecting the coin outlet gate (8) with a coin rejection outlet (11) via a validation sensor module (13) and a coin diverter mechanism, the coin chute (9) defining a coin transport path and including a radially outer curved guide wall (9a), such that in operation a coin (22, 22') exiting the coin outlet gate (8) and traversing the coin transport path is subjected to a centripetal acceleration that constrains the coin to follow and abut the contour of the radially outer curved guide wall between the coin outlet gate and a coin diverter sensor (18) disposed downstream in the coin transport path.