Yarn winding machine and yarn winding method

Abstract

The present invention provides a technique to prevent possible ribbon winding regardless of yarn type while inhibiting possible bulging. The winder 1 includes a contact roller 8 configured to come into contact with a package 4 during formation of the package 4, a traverse device 7 located upstream side of the contact roller 8 in the traveling direction of an elastic yarn 2, a free length varying means 9 for enabling the free length FL of the elastic yarn 2 located between the contact roller 8 and the traverse device 7 to be varied during formation of the package 4, and a control section 80 configured to control the free length varying means 9 in such a manner that the free length FL is increased during winding start of the package 4 and then reduced toward winding end.

Description

Technical field [0001] The invention relates to a yarn winding machine and a yarn winding method. Background technique [0002] As a technique for preventing so-called bulging when the yarn traversed by the traverse device is wound onto the winding bobbin by a touch roller to form a package, Patent Document 1 describes that the yarn is used in the initial stage of winding. A technology to increase the cross angle (winding angle) and relax the tension of the yarn layer at this initial stage. Moreover, in this Patent Document 1, it is also described that in order to achieve the purpose of avoiding winding overlap, the crossing angle is gradually reduced until the winding ends, so as to prevent the winding number from being less than one. [0003] [Patent Document 1] Japanese Patent Application Publication No. 9-71367 [0004] However, if the technique of Patent Document 1 mentioned above is adopted, there is no problem in the case where a relatively small degree of bulging occurs, an...

AI Technical Summary

Problems solved by technology

[0012] However, in the winding of yarns such as elastic yarns, since the winding tightening force is large, it is more difficult to figure 1 The convex edge shown in (a2) of (a) is more pronounced

And, if such a conspicuous convex edge also wants to be suppressed by the technology of the above-mentioned patent document 1, then as figure 2 As shown in (c1) in (c), the intersecting angle WA must be further increased anyway. As a result, the line of the intersecting angle WA crosses the two-dot chain line indicating the generation condition of the winding overlap, and the above-mentioned winding overlap occurs. When it is the winding diameter D corresponding to the intersection point indicated by the symbol X in the figure, such as figure 2 As shown in (c2) in (c), there are problems such as yarn skipping at the end surface of the package or the above-mentioned unwinding failure.

In this way, in the technique of the above-mentioned Patent Document 1, even if the bulge can be suppressed, depending on the type of yarn, it may be difficult to avoid the occurrence of overlapped windings.

Images