G - Physics – 01 – N
Patent
G - Physics
01
N
354/21
G01N 33/36 (2006.01) B65H 63/06 (2006.01) G01B 7/12 (2006.01)
Patent
CA 1134039
- 32 - ABSTRACT A method of cleaning yarns and evaluating yarn defects by means of digital technology is based on the fact that the physiological perception arising from observation of yarn defects, both cross-section as well as in length, is approximately proportional to the logarithm of the physical expansion of such yarn defects, and also of the fact that yarn defects are statistically rare events. Signals corresponding to the yarn cross section or diameter are represented and processed in the logarithmic measure. The signal analysis and the signal processing complexity required by this is constantly adapted to the present signal course and the physiologically based exactitude requirements. For this purpose, a tolerance range and a system of tolerance zones arranged in both the transverse dimension and the longitudinal dimension is defined about the yarn. Different analysis criteria are applicable for those zones. Such criteria is only analysed after the signal has directly exceeded or fallen short of at least one of the zone limits. The resulting need for signal processing capacity is distinguished by its short-lasting requirement peaks, which are small for most of the time. By subdividing the method into a rigidly clocked - 33 - data scanning process and into at least one signal processing process decoupled from this temporarily by a data buffer action, the requirement peaks are processed by one or more processors whose average processing capacity is considerably smaller than the peak requirement. This statistical load balance becomes even more favourable when similar partial process from several (statistically independent) channels by using a common processor.
346441
Kirby Eades Gale Baker
Zellweger Uster Ltd.
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