Method and device for the optical detection of foreign fibers and other impurities in a longitudinally traveling yarn
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United States of America Patent
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Jun 1, 2004
Grant Date -
Sep 20, 2001
app pub date -
Feb 26, 2001
filing date -
Feb 26, 2000
priority date (Note) -
Expired
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Abstract
Yarn impurities are detectable by a method and device wherein a first diameterdependent signal is obtained in a first measurement of a linearly traveling yarn, the intensity of the light for a second measurement is set as a function of the first signal to compensate for the effect of the yarn diameter on the light reflected by the yarn and then the second electrical signal can be directly evaluated for detecting yarn impurities. The invention improves the detection of impurities, for example in connection with spinning and bobbin winding machines.
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