Check-actuated control mechanisms – Including noncontacting – relatively movable parts connected...
Patent
1981-08-21
1984-07-17
Rolla, Joseph J.
Check-actuated control mechanisms
Including noncontacting, relatively movable parts connected...
133 8R, 194100A, G07F 302
Patent
active
044600038
ABSTRACT:
A coin presence sensing apparatus comprises one or more ringing electronic oscillator circuits at least some of which include an inductor having a dumbbell shaped core adjacent a coin passageway. A pulse generating circuit is provided to selectively pulse each oscillator circuit. After the oscillator is pulsed, it begins to oscillate. Coin proximity during the time the oscillating circuit oscillates is determined by comparing the output of the oscillating circuit with the output of an oscillating circuit having a reference inductor isolated from coins.
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Barnes Elwood E.
Flack Thomas L.
Mars Inc.
Rolla Joseph J.
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