Pivoting Alignment Finger for Coin Processing Accuracy
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Solution Overview
Problem
Coin processing machines inaccurately count smaller-diameter coins that are wet or oily due to reduced friction between the belt and the coin, causing them to misalign with sensors and be misidentified as larger denominations.
Innovation Solution
A pivotable alignment finger is introduced downstream from the guide surface, which engages larger-diameter coins to allow them to pass through and then retracts, while engaging smaller-diameter coins to redirect them closer to the guide surface for accurate alignment with sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a belt drive is used to accelerate coins towards the sensor, then coin processing speed is improved, but wet or oily coins experience reduced friction causing misalignment and counting errors
Solution Approach 1:
A pivoting alignment finger is introduced as an intermediary element between the belt drive and the sensor. This finger provides a mechanical interface that ensures proper coin alignment regardless of friction conditions. The finger pivots to accommodate different coin sizes and orientations, acting as a mediator that transfers the coin from the belt-driven motion to the correct sensing position without relying on friction alone.
Solution Approach 2:
The alignment finger changes its angular parameter (pivoting angle) dynamically based on the coin characteristics. For wet or oily coins, the finger provides additional mechanical guidance that compensates for the reduced friction. The system adapts the alignment mechanism's parameters to maintain consistent coin-sensor alignment across varying coin conditions.
2Manufacturing precision
If the opening size is optimized for larger coins, then larger coin processing is improved, but smaller wet or oily coins may pass through without proper alignment
Solution Approach 1:
The alignment finger is designed to be dynamic rather than static. It pivots and adjusts its position based on the interacting coin's characteristics. This dynamic adjustment allows the same opening to reliably process both larger coins (which engage the finger at one position) and smaller wet or oily coins (which engage the finger at a different pivoted position), ensuring proper alignment for sensing in both cases.
Solution Approach 2:
The alignment finger serves multiple functions: it guides larger coins, redirects smaller coins, and provides friction compensation for wet or oily coins of any size. This multi-functional element allows the opening to maintain its optimized dimensions for larger coins while still ensuring reliable alignment and counting accuracy for all coin types, including problematic smaller wet or oily coins.
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 ensures reliable alignment and accurate counting of wet or oily coins by maintaining contact with the guide surface before reaching the sensors, preventing misidentification.
Implementation Method 1
reduced friction between the belt and the coin
Data Source
AI summary
A coin processing machine includes a first stationary finger and a second stationary finger spaced from the first stationary finger and defining a first opening between them to receive a stream of singulated coins. The first opening is larger than the largest diameter coin to be processed by the coin processing machine. A movable third finger is spaced from the first finger and defines a second opening downstream from the first opening. Larger-diameter coins move the third finger to permit the coins to move through the second opening and past the third finger. Smaller-diameter coins that pass through the first opening and engage the third finger are directed towards the first finger before reaching and passing through the second opening.