Ultrasonic edge sensor for the detection of a web edge
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United States of America Patent
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Sep 8, 1998
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N/A
app pub date -
Jan 5, 1996
filing date -
Jan 13, 1995
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Abstract
An edge sensor working on ultrasonic principles is used to protect the edge of a travelling web and has a plurality of sensor units with adjacent or overlapping ultrasonic measurement fields between the transmitter and receiver of each unit. The units are switched so that only one unit serves to output a receiver signal when the edge crosses over into the respective measurement field.
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