Pneumatic closure of ground yarn transportation into winding bobbin, and winding unit and automatic winder

Abstract

The invention relates to pneumatic closure of ground yarn transportation into winding bobbin, and a winding unit and an automatic winder. Specifically, the invention relates to a method for carrying out the final phase of the ground yarn feeding, i.e., for transporting a ground yarn (29) from an area which is near an empty tube of a winding bobbin (5) of a winding unit (1) of an automatic winder and where the ground yarn cannot be unceasingly and directly processed to an area where that the ground yarn (29) is connected with the empty tube of the winding bobbin (5) is achieved directly by an operator or an automatic device such as a service unit of the automatic winder. The method is characterized in that the final phase of the ground yarn feeding is achieved by the rotation of a friction roller (34) which can be brought in frictional engagement with the winding bobbin (5) or by the rotation of the winding bobbin (5) or by the rotation of these two elements. However, the invention also relates to a winding unit (1) of an automatic winder or an automatic winder having a winding unit (1), characterized in that a control of the winding unit (1) or the automatic winder is configured to carry out such a method.

Description

technical field [0001] The invention relates to a winding station for rewinding a spinning package of a relatively small package or in general an unwinding package into a winding package of a large package and to an automatic winder comprising the winding station, as well as to the winding station The yarn is conveyed from the unwinding bobbin to the final stage near the newly inserted empty bobbin of the winding bobbin, where the ground yarn can then be received to be fixed on the empty bobbin. Background technique [0002] In so-called batch changes, i.e. when changing the yarn type, not only must an empty bobbin be used for a new winding bobbin, but there is also no material from the previous winding in the vicinity of the empty bobbin due to the yarn change. The ground yarn of the process is available. Therefore, the ground yarn has to be fed there first from the new unwound package to be rewound. It is also called bottom yarn feeding. The necessity to do this may ari...

AI Technical Summary

Problems solved by technology

However, since the yarn guide channel must be sealed in this area for suction, i.e. closed, the ground yarn cannot be accessed there by the operator or the maintenance crew, but another conveying mechanism is required for the final stage of the ground yarn feeding

Images