Coin checking method and apparatus employing wave train comparis

Details Coin checking method and apparatus employing wave train comparis Coin checking method and apparatus employing wave train comparis

1984-03-20

1986-03-11

Tollberg, Stanley H.

Check-actuated control mechanisms

Including means to test validity of check

By testing material composition

G07F 302

Patent

active

045749353

ABSTRACT:
A coin 12 to be checked is passed through a test coil 1 connected in parallel with a capacitor 2. A comparison coil 3 having an adjustable core 5 is also connected in parallel with a capacitor 4 and a direct current is passed through both coils in parallel from a rail 13 to an interrupter 14. The simultaneous interruption of the current through both coils produces between each coil and its capacitor a respective oscillatory discharge in the form of a decaying wave train and the characteristics and dimensions of the two coils and their capacitors are such that when a coin of the selected denomination passes through the test coil, the two wave trains are substantially identical. The two wave trains are compared by a comparator device 6 and a voltage comparator 7 generates a signal when the result of the comparison is below a predetermined datum, thus indicating that the coin is a genuine one.

REFERENCES:
patent: 3901368 (1975-08-01), Klinger

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