Coin testing apparatus

Details Coin testing apparatus Coin testing apparatus

G - Physics

07

D

340/124.3

G07D 5/08 (2006.01) G01N 27/72 (2006.01) G07D 5/02 (2006.01)

Patent

CA 1142245

- 1 - ABSTRACT A coin testing apparatus 10 comprises a coin passage- way, a coin track 13 along which coins pass on their edges through the coin passageway and an inductor 16 adjacent the coin passageway. The inductor is connected in an oscillat- ing circuit 40 so that the inductor 16 produces an oscil- lating magnetic field in the coin passageway. Means 44 are provided for examining the maximum shift in the frequency of the oscillating circuit 41 when a coin passes the induc- tor and detecting whether the shift corresponds with the shift for an acceptable coin. The inductor 16 is oblong and has its major axis perpendicular to the track so that the arrangement is sensitive to variations in diameter over a large range of diameters.

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