Coin sorting machine

Details Coin sorting machine Coin sorting machine

1978-06-20

1980-06-10

Spar, Robert J.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

194100A, 73163, G07D 500, G07F 302

Patent

active

042067758

ABSTRACT:
A coin sorting machine uses a plurality of impedance bridges each including an impedance element corresponding to a particular coin denomination and an element whose impedance is varied by the passage of a coin. The AC signal output from each bridge is compared to a reference level and the comparator output is then compared to a square wave having a period equal to that of the AC bridge excitation signal. When a bridge becomes balanced due to the passage of its particular coin, the comparator output will maintain one value for a time exceeding one period of the excitation signal and a coin can thereby be identified.

REFERENCES:
patent: 2992731 (1961-07-01), Edelman
patent: 3152677 (1964-10-01), Phillips
patent: 3278839 (1966-10-01), Wells et al.
patent: 3576244 (1971-04-01), Ptacek et al.
patent: 3653481 (1972-04-01), Boxall et al.
patent: 3869663 (1975-03-01), Tschierse

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