Coin detector system

Details Coin detector system Coin detector system

1982-06-14

1984-09-04

Bartuska, F. J.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

324236, G07D 508

Patent

active

044692137

ABSTRACT:
An electronically controlled coin tester which positions a sample coin in a magnetic field then passes a test coin through a similar magnetic field to create a null in a detector coil sensing the fields. The output of a square wave oscillator is differentiated to generate a spiked signal for exciting the magnetic field. The presence of the test coin is detected by sensing the quality of the null and test coin is accepted in response to the duration of the null. Preferably, a capacitor is charged in the absence of the test coin and discharged in the presence of the test coin and the test coin is accepted in response to the amount of energy stored in the capacitor at the time the null is produced. In addition, a pendulum damper is provided for engaging the test coin prior to its entry into the magnetic field and variably retarding the test coin in response to the coin size.

REFERENCES:
patent: 3059749 (1962-10-01), Zinke
patent: 3481443 (1969-12-01), Meloni
patent: 3599371 (1971-08-01), Hinterstocker
patent: 3741363 (1973-06-01), Hinterstocker
patent: 3796295 (1974-03-01), Montolivo et al.
patent: 3837454 (1974-09-01), Joeck
patent: 3870137 (1975-03-01), Fougere
patent: 4254857 (1981-03-01), Levasseur et al.

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