Device for the detection of sheet-like objects

Details Device for the detection of sheet-like objects Device for the detection of sheet-like objects

B - Operations, Transporting

65

H

349/31

B65H 7/04 (2006.01) B65H 7/12 (2006.01) G01P 13/00 (2006.01)

Patent

CA 1155538

A B S T R A C T Ultrasonic double-sheet detecting system in which the frequency of the ultrasonic source is tuned to the natural frequency of the total system in the circumstances as things are. When no sheet-like object is present in the detecting system this system is in a situation compar- able with proximities between microphone and loud speaker, and the frequency of the oscillator is tuned thereto. When a sheet-like object is present that situation is replaced by a comparator situation between the phases of the oscillator and of the ultrasonic signal receiver.

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