Coin Processing Plate Depressions for Wet Coin Jam Reduction
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Solution Overview
Problem
Conventional coin processing machines experience jams due to wet coins, particularly dimes, as moisture generates drag that prevents the drive member from moving them along the processing plate, leading to inefficiencies and machine stoppages.
Innovation Solution
A modified coin processing plate with closely spaced depressions on the support surface reduces the surface area in contact with coins, minimizing drag and preventing wet coins from stopping, with the depressions specifically designed to accommodate the smallest coin diameter, such as dimes, thereby reducing jam occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a flat coin support surface is used, then coins can slide smoothly along the coin path, but wet coins experience increased drag and become stationary causing jams
Solution Approach 1:
The flat coin support surface is segmented into multiple depressions distributed across the surface. Each depression is sized to accommodate the smallest coin diameter (dime), creating a patterned surface that reduces contact area between wet coins and the support surface, thereby reducing drag while maintaining coin guidance
Solution Approach 2:
The support surface is modified with localized depressions rather than changing the entire surface uniformly. The depressions are strategically positioned and sized to provide drag reduction specifically where coins contact the surface, while maintaining adequate support and guidance functionality
2Force
If the drive member applies force to move wet coins, then coins can be driven along the path, but the force is insufficient to overcome moisture-generated drag
Solution Approach 1:
The harmful effect of moisture creating drag is converted into a benefit by using the depressions to reduce the contact area between wet coins and the support surface. This minimizes the drag force from moisture while the drive member's force is sufficient to move the coins along the path
3Reliability
If depressions are added to the support surface, then drag on wet coins is reduced, but the plate complexity increases
Solution Approach 1:
The plate structure is segmented with simple, uniformly distributed depressions rather than complex features. Each depression is basic in shape and size, accommodating the smallest coin diameter, creating a relatively simple manufacturing process while achieving the drag reduction function
Solution Approach 2:
The support surface parameters are modified by adding depressions with specific dimensions matched to the smallest coin diameter. This parameter change (adding geometric features) achieves the functional improvement of reduced drag while maintaining manufacturing simplicity through standardized depression geometry
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 modified plate design significantly decreases the likelihood of wet coins stopping, effectively reducing jamming and maintaining machine operation by minimizing drag on coins, particularly dimes, which were the most likely to cause jams.
Implementation Method 1
A modified coin processing plate with closely spaced depressions on the support surface reduces the surface area in contact with coins, minimizing drag and preventing wet coins from stopping
Data Source
AI summary
A coin processing machine includes a coin support plate having a coin support surface defining a coin path extending from an intake location to a coin removal station. Depressions formed in the coin path reduce the likelihood of coins, particularly wet coins, from adhering to and stopping along the coin path.