Coin testing apparatus

专利名称：Coin testing apparatus发明人：Klaas P. Van Dort申请号：US06/134086申请日：19800326公开号：US04361218A公开日：19821130

摘要：A coin testing apparatus (10) comprises a coin passageway, 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 oscillating circuit (40) sothat the inductor (16) produces an oscillating magnetic field in the coin passageway. Thefrequency of the oscillating circuit is measured using a counter (41). A numberrepresentative of the idle frequency is stored in register (44). When a coin passes theinductor (16), the apparatus (10) detects whether the resulting frequency shift

corresponds to the shift for an acceptable coin by comparing the difference between thenumber stored in register (44) and the number stored in counter (41) with a numberpreviously stored in memory (48). The inductor (16) is oblong and has its major axisperpendicular to the track so that the arrangement is sensitive to variations in diameterover a large range of diameters.

申请人：MARS, INCORPORATED

代理机构：Davis, Hoxie, Faithful & Hapgood

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