Coin-validating arrangement

Details Coin-validating arrangement Coin-validating arrangement

1980-04-22

1981-09-01

Rolla, Joseph J.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

194102, G07F 302

Patent

active

042867045

ABSTRACT:
A coin-validating arrangement including a coin guide path and a sensing coil disposed adjacent said path, the coil being part of a tuned circuit coupled into a negative feedback path of an amplifier whereby to produce a phase shift sufficient to result in positive feedback and oscillation in said amplifier in the absence of a correct coin at the region of said path adjacent said coil, the tuned circuit being so arranged that on passage of a correct coin past said region the oscillation is quenched or reduced in amplitude, a circuit being provided for detecting the quenching or amplitude reduction of said oscillation, and a threshold detector provided for responding to said detecting circuit and opening an acceptance gate for the said correct coin.

REFERENCES:
patent: 3481443 (1969-12-01), Meloni
patent: 3977508 (1976-08-01), Baumberger
patent: 4128158 (1978-12-01), Dautremont

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