Multiple sheet detecting apparatus

Details Multiple sheet detecting apparatus Multiple sheet detecting apparatus

1975-09-22

1978-01-03

Miller, Jr., Stanley D.

Sheet feeding or delivering

Delivering

Rotary conveyor

328133, 271263, 340259, B65H 712, G08C 2700, G08B 2100

Patent

active

040669696

ABSTRACT:
A multiple sheet detecting apparatus is disclosed which includes an ultrasonic transducer responsive to a time varying electrical signal to produce a time varying ultrasonic 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 impinged upon sheet(s) for producing a second time varying signal. Comparison means are then provided which compare the phase relationship between the time varying electrical signals and produce an indication when such phase relationship indicates a multiple sheet feed condition has occurred.

REFERENCES:
patent: 3075053 (1963-01-01), McDonough et al.
patent: 3603680 (1971-07-01), Barton
patent: 3778051 (1973-12-01), Allen et al.
patent: 3833816 (1974-09-01), Emura et al.
patent: 3851323 (1974-11-01), Eltgen

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