Dual Coin Sensor Arrangement for Misalignment Detection
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Solution Overview
Problem
Conventional coin processing machines often miscount coins that are not properly aligned with the guide surface, leading to incorrect value assignments, particularly for coins that are wet or oily and slightly misaligned.
Innovation Solution
The implementation of a secondary set of coin sensors spaced closer to the guide surface, which must simultaneously signal with the primary sensors to confirm the presence of a coin, preventing incorrect value assignments and allowing for the diversion of misaligned coins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single set of coin sensors is used to detect coins moving along the guide surface, then the device complexity is low and the operation is simple, but measurement precision deteriorates because misaligned coins cannot be distinguished from properly aligned coins
Solution Approach 1:
The single set of coin sensors is divided into two separate sets: a first set positioned at a first location and a second set positioned at a second location along the coin path. Each set independently detects coins, and the controller compares signals from both sets to distinguish misaligned coins from properly aligned coins, thereby improving measurement precision without requiring each individual sensor to be more complex
Solution Approach 2:
The solution adds a spatial dimension to coin detection by positioning sensor sets at different locations along the coin path. The first set detects coins at one position while the second set detects at another position, creating a multi-dimensional detection system that can identify misalignment based on positional differences in sensor activation patterns
2Measurement precision
If coin sensors are placed further from the guide surface to accommodate varying coin positions, then ease of operation improves, but measurement precision deteriorates because the sensors cannot accurately distinguish coin denomination for misaligned coins
Solution Approach 1:
The system performs preliminary detection using the first set of sensors before final confirmation by the second set. The controller uses signals from the first sensor set to identify potential coin presence and denomination, then verifies these detections with the second sensor set, ensuring accurate denomination identification while maintaining tolerance for minor misalignments through the verification process
Data Source
AI summary
A coin processing machine for processing coins of various diameters includes an elongate guide surface that guides coins moving along a coin path extending beside and along the guide surface, and sets of first and second coin sensors spaced along the path. Each first and second coin sensor is associated with a respective coin diameter. The coin sensor signals are transmitted to a controller that recognizes the value of a coin associated with a pair of first and second sensors only when both sensors signal the presence of a coin. If only the first sensor signals the presence of a coin, the controller may generate an output signal indicating the presence of a misaligned coin moving along the coin path.