An Ultrasonic Double-Sheet Detection System for Collators Available to Purchase

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.