Sonic web break detector

Details Sonic web break detector Sonic web break detector

1989-08-08

1991-08-06

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

340675, G01N 924, G08B 2100

Patent

active

050367064

ABSTRACT:
A web break detector which utilizes sonic signals to detect the occurrence of a break in a moving web in web handling machinery. A separate sonic transmitter and receiver transducer are utilized to provide improved speed of detection, and enhanced reliability. The dual transducer detector can also be placed closer to the web to enhance reliability and efficiency. Multiplexing is utilized to permit multiple detectors to be operated with reduced complexity and minimal mutual interference. The transmitting transducer is triggered to emit a sonic burst for a predetermined time period and at a predetermined rate. The receiving transducer is activated for a predetermined time duration beginning a predetermined delay period after the sonic burst is triggered and generates a detection signal in response to receiving the reflected burst. The absence of the detection signal causes generation of a control signal to stop the web handling machinery.

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