Coin discriminating apparatus

Details Coin discriminating apparatus Coin discriminating apparatus

1979-09-12

1982-09-14

Rolla, Joseph J.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

194 97R, 73163, G07F 302

Patent

active

043490956

ABSTRACT:
A coin discriminating apparatus comprises two coils on opposite sides of a path for coins, one coil being connected to a signal generator so as to give repetitive abrupt flux changes and a gating device being provided for short circuiting the other coil but removing the short circuit a predetermined time delay after each flux change. A circuit is responsive to the amplitude of a voltage pulse which is produced across said other coil in response to each removal of the short circuit to discriminate between coins. This apparatus may form the second test of a two-test coin discriminating apparatus, wherein the first test measures a phase displacement caused by the coin passing between another pair of coils and this measurement is used to set the time delay to one of selected values, according to the expected coin, so that the voltage pulse will be of a constant amplitude for valid coins.

REFERENCES:
patent: 3797307 (1974-03-01), Johnston
patent: 3966034 (1976-06-01), Heiman et al.
patent: 4091908 (1978-05-01), Hayashi et al.
patent: 4108296 (1978-08-01), Hayashi et al.
patent: 4249648 (1981-02-01), Meyer
patent: 4254857 (1981-03-01), Levasseur et al.

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