Compensation of winding tension


The traversing motion of the yarn depending on stroke and winding helix requires compensation of the winding tension for homogeneous package density. A thread guide is arranged to effect crosswise laying of the yarn in the package by means of its to-and-fro movement. A compensation bow (Fig. 32, a) and the yarn tension bar (Fig. 32, b) are needed to even out path-length variations which arise because the length of yarn between the take-off rollers and the right- or left-hand edge of the package is greater than the length between those rollers and the middle of the package. Pathlength compensation by means of compensation bow and yarn tension bar only is, however, adequate for winding cylindrical and conical packages with up to 2° taper.

Compensation bow and yarn tension bar no longer suffice for tension compensation when producing packages with a taper of 3°51’ or 4°20’.
A three-part differential winding cylinder is therefore used, for example, for the package drive (Fig. 33), with which the differences in speed from small to large package diameter are compensated via the wheel and disc differential gear.

Fig. 32 – Compensation of winding tension with compensation bar (a) and yarn tension bar (b)

Fig. 33 – Three-part winding cylinder with powered middle section (a), two powered side sections (b), wheel and disc differential gear (c) and friction coatings (d) for driving the package