A rotor spinning machine includes a plurality of work stations arranged side by side between two front-side ends along at least one longitudinal side of the machine. Each work station includes work elements for producing and winding a yarn, such as a feed device, an opening device, a spinning rotor, and a winding device. A suction device provides a negative spinning pressure at the work stations and includes a negative pressure source arranged at each of the two front-side ends of the rotor spinning machine. Each negative pressure source is connected to a separate negative pressure channel that extends in a longitudinal direction of the rotor spinning machine only over a part of a total number of the work stations. Each work station includes an individual drive for the spinning rotor.

A method, and associated textile machine winding station, are provided for handling a yarn end of a cross-wound bobbin at the winding station, wherein the cross-wound bobbin is held and driven in a bobbin holder. A thread is laid in a cross-wise manner on the cross-wound bobbin by means a traverse device. A suction nozzle having a movable suction mouth is subjected to negative pressure, and the suction mouth is moved relative to the suction nozzle such that a distance between the suction mouth and the cross-wound bobbin is changed in order to find the thread end on the cross-wound bobbin and to suck the thread end into the suction nozzle, or to stretch the thread end sucked into the suction nozzle between the suction mouth and the cross-wound bobbin. The stretched thread is moved to a unit of the textile machine for further processing.

A method, and associated textile machine winding station, are provided for handling a yarn end of a cross-wound bobbin at the winding station, wherein the cross-wound bobbin is held and driven in a bobbin holder. A thread is laid in a cross-wise manner on the cross-wound bobbin by means a traverse device. A suction nozzle having a movable suction mouth is subjected to negative pressure, and the suction mouth is moved relative to the suction nozzle such that a distance between the suction mouth and the cross-wound bobbin is changed in order to find the thread end on the cross-wound bobbin and to suck the thread end into the suction nozzle, or to stretch the thread end sucked into the suction nozzle between the suction mouth and the cross-wound bobbin. The stretched thread is moved to a unit of the textile machine for further processing.

A method for operating a textile machine with several identical workstations which each have a basic requirement for negative pressure for regular production operation and an additional requirement for negative pressure following an interruption to production at the workstation, and with a vacuum system with limited suction force to exert the negative pressure on the workstations. A minimum negative pressure (p.sub.min) is set and the number workstations simultaneously supplied with additional negative pressure is limited so that the minimum negative pressure (p.sub.min) is always met. In accordance with the invention, a sub-negative pressure (p.sub.sub) is specified which is below the minimum negative pressure (p.sub.min) and, if a specified event occurs, the number of workstations simultaneously supplied with additional negative pressure is temporarily limited so that the sub-negative pressure (p.sub.sub) is always met.

An open-end spinning machine having a plurality of workstations, each workstation has a spinning apparatus for producing a thread, a thread draw-off device for drawing off the thread from the spinning apparatus, a storage nozzle, a winding apparatus for producing a cross-wound bobbin, and a suction nozzle, to which negative pressure can be applied. The open-end spinning machine is equipped with at least one service unit, serving a plurality of the workstations and has an auxiliary-thread delivery device for delivering an auxiliary thread and an auxiliary-thread draw-off, which are used in a piecing process at a workstation to be served. The auxiliary-thread draw-off can be operated in such a way that the auxiliary-thread draw-off speed of the auxiliary-thread draw-off for drawing off the pieced auxiliary thread has a speed offset, which takes into account the thread draw-off speed of the thread draw-off device and at least one additional correction factor.

An open-end spinning machine having a plurality of workstations, each workstation has a spinning apparatus for producing a thread, a thread draw-off device for drawing off the thread from the spinning apparatus, a storage nozzle, a winding apparatus for producing a cross-wound bobbin, and a suction nozzle, to which negative pressure can be applied. The open-end spinning machine is equipped with at least one service unit, serving a plurality of the workstations and has an auxiliary-thread delivery device for delivering an auxiliary thread and an auxiliary-thread draw-off, which are used in a piecing process at a workstation to be served. The auxiliary-thread draw-off can be operated in such a way that the auxiliary-thread draw-off speed of the auxiliary-thread draw-off for drawing off the pieced auxiliary thread has a speed offset, which takes into account the thread draw-off speed of the thread draw-off device and at least one additional correction factor.

The invention relates to a method for obtaining environmentally-friendly, sustainable, and biodegradable yarns by subjecting the PLA (polylactic acid), which is used in many different sectors such as the food packaging industry, health and medical industry, construction industry, cosmetic industry, and textile industry, to a variety of procedure steps with the open-end method, and a new fabric to be used in the textile sector thanks to the weaving of the said yarns.

An open-end spinning device having a rotor housing (1) which can be acted upon by negative pressure and a spinning rotor (2), the rotor housing (1) is open towards the front and can be closed by a cover element, to the rear the rotor housing (1) has a rear wall (3) with a passage opening (4) for a rotor shaft (5) of the spinning rotor (2). In order to prevent the occurrence of thread coils inside the rotor housing (1) behind the spinning rotor, a narrow gap (6) of less than 2 mm is provided between the spinning rotor (2) and the rear wall (3) of the rotor housing (1) at the largest outer diameter of the spinning rotor (2) and the rear wall (3) of the rotor housing (1) is designed such that the area (7) behind the spinning rotor (2) is covered inside the rotor housing (1).

An open-end spinning device having a rotor housing (1) which can be acted upon by negative pressure and a spinning rotor (2), the rotor housing (1) is open towards the front and can be closed by a cover element, to the rear the rotor housing (1) has a rear wall (3) with a passage opening (4) for a rotor shaft (5) of the spinning rotor (2). In order to prevent the occurrence of thread coils inside the rotor housing (1) behind the spinning rotor, a narrow gap (6) of less than 2 mm is provided between the spinning rotor (2) and the rear wall (3) of the rotor housing (1) at the largest outer diameter of the spinning rotor (2) and the rear wall (3) of the rotor housing (1) is designed such that the area (7) behind the spinning rotor (2) is covered inside the rotor housing (1).

A work station of a textile machine includes a plurality of fiber-guiding work elements that are divided into at least two groups. A first work station part is defined at the work station on which a first group of the fiber-guiding work elements is arranged. A second work station part is defined at the work station on which a second group of the fiber-guiding work elements is arranged. The second work station part is arranged in a movable manner relative to the first work station part at the work station or is arranged in a removable manner at the work station. A pneumatic thread storage element is also provided for a work station of a textile machine for the temporary receiving of a thread, and includes a multi-part structure with a first thread storage section and a second thread storage section connected to one another at a separation point.