Ultrasonic double feed detecting device

Details Ultrasonic double feed detecting device Ultrasonic double feed detecting device

2006-10-31

2006-10-31

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

C367S124000, C271S262000, C271S265040

Reexamination Certificate

active

07130245

ABSTRACT:
A double feed detecting apparatus provided with an ultrasonic transmitter installed on one side of a transport path for a sheet material for transmitting an ultrasonic toward the sheet material, an ultrasonic receiver installed on the other side of the transport path for the sheet material for receiving the ultrasonic transmitted by the ultrasonic transmitter and outputting a received ultrasonic signal, a first determining device for determining whether double feed or not in accordance with the amplitude of the received ultrasonic signal output by the ultrasonic receiver, and a second determining device for detecting a phase change in the received ultrasonic signal, and determining whether double feed or not on the basis of the detected phase change.

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Relevant portion of Search Report issued on Aug. 5, 2005 for counterpart application EP 04 00 2088.

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