| 摘要 |
A yarn is wound onto a generally conical yarn package using a cam cylinder to traverse the yarn back and forth between the ends of the package. A first sensor is used to determine the rotational position of an element which is rotating synchronously with the package. The position of the yarn lengthwise of the package is determined using a second sensor. A correction factor is obtained for determining an instantaneous yarn feeding speed from an average yarn speed value obtained from the peripheral speed of the rotating element. The improved yarn speed determination enables on-line spectrograms to be provided on yarns handled in these machines. Also, there is considerably greater accuracy when measuring lengths of yarn defects.
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