Method and apparatus for measuring the diameter of coins

Details Method and apparatus for measuring the diameter of coins Method and apparatus for measuring the diameter of coins

2006-09-12

2006-09-12

Crawford, Gene O. (Department: 3653)

Check-actuated control mechanisms

Including means to test validity of check

By testing material composition

C194S303000, C194S320000, C194S334000

Reexamination Certificate

active

07104384

ABSTRACT:
A method for measuring the diameter of coins in coin validators, comprising the steps below:The coins traverse an electromagnetic field which is formed such as to partially hide the field, at least also by their upper area.The field is generated between at least one transmitter coil and a receiver coil.The transmitter coil is periodically acted on by a short transmission pulse the duration of which is small as compared to the time of coin passage.The maximal attenuation values are determined for different times of the transmission pulse.The attenuation values measured are extrapolated into time 0.The measured value determined by extrapolation is compared to a predetermined acceptance band or a predetermined characteristic line for coin diameters for comparison to a stored setting.

REFERENCES:
patent: 4998610 (1991-03-01), Said et al.
patent: 6173826 (2001-01-01), Furneaux
patent: 6766892 (2004-07-01), Martin et al.
patent: 197 26 449 (1999-01-01), None
patent: 89/01209 (1989-02-01), None

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