Method of, and device for, spinning-in yarn on an open-end spinning

Abstract

Method and apparatus for spinning-in yarn on an open end spinning machine following a yarn rupture, wherein the machine includes a plurality of operating units which wind yarn on respective bobbins and an attending device movable along the operating units to the unit at which a rupture occurred. Upon a yarn rupture, the winding of the bobbin is halted, and the bobbin is permitted to be unwound a metered length. A detecting nozzle detects the yarn end and sucks in the yarn end and moves away from the bobbin. A catching arm supports the yarn. A tension roller receives the yarn on it. The tension roller is located on a spinning head which is swingable from a position toward the bobbin to a position toward the rotor and the head is then movable to move the yarn on the roller toward the rotor. A clamp on the spinning head clamps the yarn and a trimmer trims the yarn to form the yarn end. An ancillary compensator at the spinning head deflects the yarn to compensate and then releases the yarn. The yarn end is sucked into the rotor where it is blended with the incoming fibers to reform the yarn which is then again wound on the bobbin.