Method of and apparatus for assessing coins

Details Method of and apparatus for assessing coins Method of and apparatus for assessing coins

1981-06-18

1984-03-13

Rolla, Joseph J.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

73163, G07F 302

Patent

active

044361963

ABSTRACT:
The invention relates to a coin validator for use in a micro-processor controlled call coin box telephone instrument. The validator comprises first and second coil sets driven by square wave interrogation pulses. The arrangement of the coils is such that when a coin is in the coin-runway of the call coin box, one coil pair is used to interrogate the coin in the runway while the other coil pair provides environmental conditions apertaining to the runway. The information generated by both coil sets is combined thereby compensating for environmental changes and drift. Information pertaining to the relative response times of the secondary coils is then used to determine coin validity.

REFERENCES:
patent: 3599771 (1971-08-01), Hinterstocker
patent: 3682286 (1972-08-01), Prumm
patent: 3797307 (1974-03-01), Johnston
patent: 3901368 (1975-08-01), Klinger
patent: 3962627 (1976-06-01), Ptacek et al.
patent: 4254857 (1981-03-01), Levasseur et al.
patent: 4326621 (1982-04-01), Davies
patent: 4349095 (1982-09-01), Lewis

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