Check-actuated control mechanisms – Including means to test validity of check – By testing material composition
Patent
1992-04-14
1993-05-25
Huppert, Michael S.
Check-actuated control mechanisms
Including means to test validity of check
By testing material composition
194334, 194335, G07D 508
Patent
active
052131904
ABSTRACT:
A method of testing a coin in a coin testing mechanism, comprising subjecting a coin inserted into the mechanism to an oscillating field generated by an inductor, measuring the reactance and the loss of the inductor when the coin is in the field, and determining whether the direction in the impedance plane of a displacement line, representing the displacement of a coin-present point which is defined by the measurements, relative to a coin-absent point representing the inductor reactance and loss in the absence of a coin, corresponds to a reference direction in the impedance plane. The reactance and loss measurements may be taken by a phase discrimination method. Techniques are disclosed for compensating for phase error in the phase discrimination, for measuring the direction of the displacement line relative to a different axis in order to avoid measurement errors being a consequence of any phase discrimination phase error, for applying offsets to achieve advantages in signal handling, for making the measurements thickness-sensitive, and using the change in reactance as an additional coin acceptance criterion. Some of these refinements are usable independently of the phase discrimination method. Apparatus for carrying out the methods is also disclosed.
REFERENCES:
patent: 3749220 (1973-07-01), Tabiichi et al.
patent: 4409543 (1983-10-01), Sugihara
patent: 4460080 (1984-07-01), Howard
patent: 4946019 (1990-08-01), Yamashita
patent: 5048662 (1991-09-01), Yamashita et al.
Hagemaier, "Fundamentals of Eddy Current Testing", Chaps. 8-10, USA 1990.
Bailey John W.
Chittleborough Michael
Furneaux David M.
Ralph Alan
Sagady Cary
Hienz William M.
Huppert Michael S.
Mars Incorporate
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