During the winding process of friction transmission, the diameter of the cylinder gradually increases and the speed gradually decreases. If the speed of the yarn guide remains constant, at a certain period of time, when the spool rotates exactly an integer number of revolutions in one or several reciprocating cycles of the yarn guide, the yarn loops of the spool will overlap back and forth.
The rotational speed of the cylinder decreases continuously with the increase of its diameter But its transmission diameter increases very slowly, so the spool rotates almost at a constant speed within several reciprocating motions of the yarn guide, which means that the overlapping phenomenon will continue for a considerable period of time, resulting in dense raised stripes on the surface of the spool, causing poor contact between the spool and the rolling groove drum Not only does it cause excessive friction on some yarns, but it also causes the tube to bounce or move axially, resulting in spider webs or edge defects at both ends of the tube.
In overlapping bands The layers of yarn rings are tightly stacked together, making it easy for the yarn rings to embed into each other Increase the frictional resistance during warp and weft winding, causing yarn breakage and disorder. If the soft mesh tube used for dyeing is too tightly wound, it will hinder the penetration of the dye solution, resulting in uneven dyeing; The same applies to tubes that require chemical post-treatment or water washing.
For a winding machine driven by a spindle shaft, due to the requirement of constant spinning speed or tension, the winding speed must be maintained constant. Therefore, as the winding diameter gradually increases, the speed of the winding decreases accordingly, that is, the speed is inversely proportional to the diameter.
In this case, if a single acting guide wire performs a constant constant speed reciprocating motion, then when the winding diameter increases to a certain value The overlapping phenomenon of yarn loops can also occur when the number of loops wound onto the tube during a reciprocating guide wire is exactly an integer or very close to an integer loop.