An Ultrasonic Double-Sheet Detection System for Collators

[+] Author and Article Information
M. Shiraishi

Ibaraki University

Y. Fujinuma, T. Ishikawa

Ibaraki Prefectural, Industrial Technology Center

K. Ishige, H. Doki

Bunshow Dou Seiki Co. Ltd., Ibaraki, Japan

J. Eng. Ind 114(4), 489-493 (Nov 01, 1992) (5 pages) doi:10.1115/1.2900702 History: Received June 01, 1991; Online April 08, 2008


A new ultrasonic method of detecting double sheets in collators has been developed that overcomes several shortcomings of conventional detection techniques. An air curtain efficiently reduces the ultrasonic detector’s vulnerability to ambient temperature fluctuations. The accuracy of detection is enhanced by utilizing the low-level component of the received ultrasonic signal. A gain adjustment technique is introduced which enables detection for a wide range of paper stocks using a single threshold level.

Copyright © 1992 by The American Society of Mechanical Engineers
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