Importance

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Abstract

Apparatus for accepting a U.S. bill or other paper currency having a portrait area printed with magnetic ink with spaced parallel lines in the background portions thereof. A pair of zones of predetermined length normally containing said portions and disposed a predetermined distance from an edge of the bill are first magnetized and then moved past a magnetic head to produce a train of pulses spaced by time intervals corresponding to the distance between the lines. For each scanning zone the number of such time intervals falling within a predetermined range is counted, and the bill is rejected unless the number of such time intervals counted is at least a predetermined minimum. In another aspect of the disclosure, an area of the bill normally containing nonmagnetic ink is scanned by a sensor that generates a pulse edge on traversing a magnetic bill portion, and the bill is rejected if a predetermined number of pulse edges are generated during the scanning of such area.

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First Claim