Rieter Ingolstadt Spinnereimaschinenbau Ag

Schubert & Salzer Maschinenfabrik Aktiengesellschaft

Karl Rupert

Erwin Braun

Ulrich Roediger

Anthony Ball

Walter Mayer

Hubert Lochbronner

Becker Rudolf

A process for piecing a broken yarn on an open-end spinning device in which the fiber feed to the fiber collection surface, and which has been interrupted during stoppage of the open-end spinning device. The fiber feed is switched back on and is immediately brought to full production speed. In this process the combed-out state of the fiber tuft at the point in time of when fiber feed is switched back on is ascertained. The point in time when yarn draw off is switched back on and the speed of it are adapted to when the feeding of fibers to the fiber collection surface becoming effective. The yarn is subjected to a multi-phase acceleration. The first phase of the draw-off acceleration is adapted to the incorporation of fibers into the back-fed yarn end. At least one additional phase of the draw-off acceleration serves to reach and/or to maintain the desired fiber mass. The control device to carry out the piecing process is connected to a device for the ascertainment of the combed-out state of the fiber tuft at the moment of piecing and the control device controls the yarn draw-off as a function of this ascertained combed-out state of the fiber tuft. At least two yarn accelerating devices are provided which can be selected by the control device.

Method and device for joining yarn in an open-end spinning means

In a device for the piecing of a yarn on an open-end spinning device, a yarn mover by means of which a yarn end is fed to a yarn draw-off pipe is provided. A first stop to determine the cutting position and a second stop to determine the yarn insertion position are assigned to the yarn mover. The first stop can be put out of action. In addition, a yarn length adjusting device is provided to determine the length of yarn to be fed back into the open-end spinning element. The cutting position and the yarn insertion position of the yarn mover are set for the smallest size fiber collection surface of the open-end spinning element that can be used. When larger fiber collection surfaces are used, the additional required length of yarn is readied by rotating the winding device backward.

Process and device to piece a yarn on an open-end spinning device

A device and process for piecing yarn on an open-end spinning device where a yarn is fed back either from the winding bobbin on which it had been wound previously, during the spinning process, or from a special piecing bobbin via a common back-feeding path to the spinning device. The piecing yarn, drawn off from the piecing bobbin, as well as the yarn drawn off from the winding bobbin is first subjected to the effect of a controllable draw-off action at the beginning of this common back-feeding path upon completion of the piecing process. The yarn, which continues to be delivered by the spinning device, is subjected to the effect of normal spinning draw-off only upon reaching the full draw-off speed and is transferred to an empty tube located in the winding device, whereby the excess yarn segment with the piecing joint is severed and removed when replacing the winding bobbin. A feeding device with a pair of auxiliary rollers is provided to feed the piecing yarn to a back-feeding device, whereby a roller of the pair of auxiliary rollers can be assigned to the bobbin lifted off from the winding roller as a drive roller and can be driven by means of a controllable drive.

Process and device for piecing yarn to an open-end spinning device

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Ingolstadt, Germany

Karl Rupert