Title: Apparatus for measuring thickness differences in record carriers, such as bank notes and the like

Abstract: The apparatus comprises a roll, having an elastic surface, mounted for rotation about a fixed axis with the elastic surface arranged to engage one surface of a record carrier. A piezoelectric transducer is mounted perpendicular to the axis of the roll and rigidly with respect to the roll, and a sensor is mounted quasi-rigidly, with respect to the transducer, between the roll and the transducer, the sensor being fixedly joined to the transducer. In the quiescent condition, without a record carrier being passed between the sensor and the roll, the distance from the roll surface to the sensor is smaller than the smallest paper thickness to be measured. The transducer is mounted in a holder having a spring member fixedly joining the sensor to the transducer. The sensor may include a sensing roll or may be designed as a sensing runner with a sharp edge, and an elastic damping plate connects the transducer to the sensor.

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Inventors: Mitzel, Wilhelm (Neukaeferloh, DT)

Application Number: 704482
Filing Date: 1976-07-12
Publication_date: 1978-01-17
Assignee: G.A.O. Gesellschaft fur Automation und Organisation m.b.H. (DT)
Primary Class(es): 33/501.03 73/159, 209/534, 209/603
Other Classes:
US Patent Ref:

1453438	May, 1923	Butterfield et al.	33/147.
2337064	Dec, 1943	Peters	209/88.
2632545	Mar, 1953	Schubert	209/88.
3763483	Oct, 1973	Urmenyi	33/147.
3796094	Mar, 1974	Cook et al.	73/94.
3899831	Aug, 1975	DeLeon	33/143.
3919779	Nov, 1975	Piggott	33/147.

Other Refs: 1,094,643

Dec, 1954	FR

Primary Examiner: Aegerter, Richard E.
Assistant Examiner: Stearns, Richard R.
Attorney: McGlew and Tuttle