Method for checking coins and coin checking apparatus for the pe

Details Method for checking coins and coin checking apparatus for the pe Method for checking coins and coin checking apparatus for the pe

1976-09-20

1978-08-08

Reeves, Robert B.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

194 99, 324236, G07F 302

Patent

active

041051050

ABSTRACT:
A method of, and apparatus for, checking coins, wherein the coin to be checked is moved through a constantly regulated alternating-current field of a measuring coil. The influence of the coin upon the alternating-current field produces a regulation magnitude formed from the difference between a reference voltage and the rectified oscillator-measuring voltage. The regulation magnitude readjusts, by means of the oscillator circuit, the oscillator-measuring voltage at the measuring coil to a constant value. During coin checking the regulation magnitude is employed as the coin checking criterion in a manner such that it is possible to determine by means of an evaluation circuit whether this regulation magnitude has reached a value falling within an upper and lower boundary. The time-constant of the regulation circuit is chosen such that slow changes can be controlled, but the oscillator-measuring voltage is also maintained constant during relatively rapid passage of the coin through the measuring coil and there is obtained as high as possible amplitude of the regulation magnitude.

REFERENCES:
patent: 2660704 (1953-11-01), Harmon et al.
patent: 3506103 (1970-04-01), Kuckens et al.
patent: 3738468 (1973-06-01), Prumm
patent: 3741363 (1973-06-01), Hinterstocker
patent: 3768618 (1973-10-01), Collins
patent: 3870137 (1974-03-01), Fougere
patent: 3901368 (1975-08-01), Klinger

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