Method of and apparatus for exchanging full bobbins for empty ones in

Abstract

Method of and apparatus for exchanging full bobbins for empty ones in textile machines, particularly open-end spinning machines with take-up and winding rollers for taking-off and winding yarn on a bobbin. An end of yarn severed between said take-up rollers and said winding rollers is introduced into the tube of an empty bobbin in three phases. In the first phase, a preparation step for gripping the yarn between the take-up rollers and the winding rollers takes place; in the second phase the delivery yarn is gripped and severed; and in the third phase the gripped yarn end is introduced into the interior of the bobbin tube at least over its entire length, and is simultaneously prevented from being untwisted at the tube edge. In one embodiment of the apparatus for carrying out the method of exchanging full bobbins for empty ones, the introduction of yarn into the tube interior is effected by a gripper with a revolving arm, one part of which, designed for passing, in the first phase, through the tube of an empty bobbin, is longer than the length of the tube. In another embodiment of the apparatus, the introduction of yarn into the tube interior is effected by a gripper with two reciprocatory arms, one of which is a yarn deflecting arm and the other of which is a yarn introducing arm.