Multiple sheet detecting apparatus

Details Multiple sheet detecting apparatus Multiple sheet detecting apparatus

G - Physics

01

N

349/31

G01N 29/00 (2006.01) B65H 7/04 (2006.01) B65H 7/12 (2006.01) B65H 9/20 (2006.01) G01N 29/07 (2006.01) G01N 29/24 (2006.01)

Patent

CA 1069208

ABSTRACT OF THE DISCLOSURE A multiple sheet detecting apparatus is disclosed which includes an ultrasonic transducer responsive to a time varying electrical signal to produce a time varying ultra- sonic signal which impinges upon sheet(s) at a position along a predetermined path. A second ultrasonic transducer receives a portion of the ultrasonic wave which passes through such implinged upon sheet(s) for producing a second time varying signal. Comparison means are then provided which compare the phase relationships between the time varying electrical signals and produce an indication when such phase relationship indicates a multiple sheet feed condition has occurred.

258431

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