Method and apparatus for discriminating different coins in free

Details Method and apparatus for discriminating different coins in free Method and apparatus for discriminating different coins in free

1998-10-19

2000-08-08

Olszewski, Robert P.

Check-actuated control mechanisms

Including means to test validity of check

By testing material composition

32420717, 324239, G07D 508, G01N 2772

Patent

active

060987774

ABSTRACT:
A method and apparatus for identifying a coin in free fall employs a coin sensor that has a pair of drive coils for generating a horizontally elongated magnetic field across a free-fall path of the coin. The drive coils are driven by a square wave, and ringing waveforms induced in a pair of sensor coils disposed on the two sides of the free-fall path are measured when the coin passes through the magnetic field. A digitized signature is derived from the measured ringing waveforms and compared to a set of pre-stored reference signatures to find a match. A diverter mechanism directs the coin to an accept path when a match is found and to a reject path when a match is not found.

REFERENCES:
patent: 5056644 (1991-10-01), Parker
patent: 5078252 (1992-01-01), Furuya et al.
patent: 5131518 (1992-07-01), Shimizu

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