Yarn movement information acquisition device and yarn winding machine

Abstract

A first yarn unevenness detecting sensor (43) detects thickness unevenness in travelling yarn and outputs a first yarn thickness unevenness signal. A second yarn unevenness detecting sensor (44) is arranged at a prescribed distance from the first yarn unevenness detecting sensor (43), and detects thickness unevenness in the yarn and outputs a second yarn thickness unevenness signal. A similarity degree evaluating section (65) determines a plurality of similarity degrees by performing a similarity degree evaluation processing. A weighting processing section executes a weighting processing on the plurality of the similarity degrees and determines a plurality of weighted similarity degrees. A travelling information acquiring section (67) calculates a time delay amount between the first yarn thickness unevenness signal and the second yarn thickness unevenness signal in accordance with the weighted similarity degree, and acquires travelling information of the yarn in accordance with the delay amount.

Description

technical field [0001] The present invention mainly relates to the configuration of a yarn movement information acquisition device for detecting the state of a moving yarn. Background technique [0002] In the yarn winding machine that winds the yarn, in order to control the winding, information about the moving state of the yarn may be required. Therefore, such a yarn winding machine includes a yarn movement information acquisition device for acquiring information (yarn movement information) related to the movement state of the yarn. As the above-mentioned moving state, for example, the moving speed of the yarn and the like are considered. [0003] Such a yarn movement information acquisition device is described in, for example, Japanese Patent Application Laid-Open No. 51-60551. The yarn length-yarn speed measuring device disclosed in Japanese Patent Application Laid-Open No. 51-60551 detects the hairiness and thickness unevenness of the moving yarn through two non-conta...

AI Technical Summary

Problems solved by technology

In other words, if the area is too wide, a sub-maximum is included in the area, and the risk of being locked in the sub-maximum (wrong maximum value) increases.

On the other hand, if the zone is too narrow, the main maximum may move outside the zone in case of sharp yarn speed changes

In this case, in the configuration of Japanese Patent Application Laid-Open No. 6-186242, the main maximum value cannot be locked.

[0007] However, in practice, it is difficult to properly select the range of the above-mentioned areas

Therefore, in the configuration of Japanese Patent Application Laid-Open No. 6-186242, it cannot be ruled out that the sub-maximum value (wrong maximum value) of the correlation function is locked.

As a result, the problem of accurately calculating the moving speed of the yarn cannot be solved.

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