Indexing apparatus using ultrasonic feedback

Details Indexing apparatus using ultrasonic feedback Indexing apparatus using ultrasonic feedback

1992-10-19

1993-08-31

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With time interval measuring means

335324, G03G 1500, G01S 1100

Patent

active

052415171

ABSTRACT:
The present invention is a method and apparatus for monitoring the linear displacement of a body using a pair of ultrasonic transducers, one for transmitting an ultrasonic signal and one for receiving the ultrasonic signal. For example, the present invention may be used for monitoring the position of a stapling device relative to a set of copy sheets. The position monitoring system senses the linear position of the stapling device by measuring the time delay required for the ultrasonic signal to propagate from the transmitting transducer, located on a stationary reference, and the receiving transducer, operatively attached to the movable stapling device. The time delay is determined as a function of both a partial signal period and an integral number of complete signal periods for the ultrasonic signal. Moreover, because the frequency of the ultrasonic signal may exceed the resolution of a microcontroller used to monitor the position, frequency dividers are used to reduce the signal frequencies to measurable levels without impacting the performance of the position monitoring system.

REFERENCES:
patent: 3657659 (1972-04-01), Johnson
patent: 3893064 (1975-07-01), Nishihara et al.
patent: 4247922 (1981-01-01), Jackson et al.
patent: 4506354 (1985-03-01), Hansen
patent: 4578674 (1986-03-01), Baker et al.
patent: 4713665 (1987-12-01), Phelan
patent: 4752917 (1988-06-01), Dechape
patent: 5097453 (1992-03-01), Kobayashi et al.

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