Abstract: An axial bearing for a spinning rotor of an open-end spinning machine includes a static bearing component having axially polarized permanent magnet rings delimited on both sides by ferromagnetic pole disks arranged in a bearing housing, the static bearing component interacting with a dynamic bearing component formed by ferromagnetic webs arranged on a rotor shaft of the spinning rotor. Each pole disk includes a disk ring, a central opening, a vertical axis, and a horizontal axis. The disk ring includes an area of reduced ferromagnetic material on an inner circumference thereof at the vertical axis as compared to a remaining inner circumferential area of the disk ring.

Abstract: An axial bearing for a spinning rotor of an open-end spinning machine includes a static bearing component having axially polarized permanent magnet rings delimited on both sides by ferromagnetic pole disks arranged in a bearing housing, the static bearing component interacting with a dynamic bearing component formed by ferromagnetic webs arranged on a rotor shaft of the spinning rotor. Each pole disk includes a disk ring, a central opening, a vertical axis, and a horizontal axis. The disk ring includes an area of reduced ferromagnetic material on an inner circumference thereof at the vertical axis as compared to a remaining inner circumferential area of the disk ring.

Abstract: A method is provided for operating a textile machine, with a multiple number of adjacent work stations having a respective spinning unit with a spinning device and/or one winding device and handling elements for piecing a thread or for connecting two thread ends. If production is interrupted, a thread end on the bobbin side is provided to a defined receiving position at the work station. For piecing the thread or for connecting the thread ends, the thread end on the bobbin is cut to length by the work station work elements, received from the receiving position, prepared for piecing or for connecting and pieced up or connected. A thread end wound on the bobbin is sought out by means of a thread seeking device deliverable to multiple work stations of the textile machine, and the thread end is subsequently moved into the receiving position at the work station, from which it is received by the work station work element of the work station, in particular by a handling element of its own work station.

Abstract: With a method for operating a spinning machine (1), with a multiple number of work stations (2) arranged next to each other, each work station (2), as a work element (3, 28, 4, 10, 16, 17, 18), features at least one spinning unit (3) with a spinning device (28), one winding device (4) and handling elements (10, 16, 17, 18) of their own work station for spinning back in the thread (F). If the spinning process is interrupted, a thread end (6) on the coil side is provided in a defined receiving position (A) at the work station (2). For spinning back in a thread (F), the thread end (6) on the coil side is cut to length by work elements (3, 28, 4, 10, 16, 17, 18) of the work station (2), in particular the handling elements (10, 16, 17, 18) of their own work station, received from the receiving position (A), prepared for spinning back in and spun in.

Abstract: An air jet spinning machine for producing spun threads from staple fiber strands includes a number of spinning positions, to each of which compressed air nozzles are arranged for the purpose of generating the spinning twist. A joint compressed air regulator is connected upstream of the spinning positions, which regulator includes a pressure sensor and a regulating device. The compressed air regulator is set at a reference pressure, which corresponds to the unregulated static pressure prevailing when all spinning positions are in operation. In the case of a change in the static pressure, the compressed air regulator re-adjusts to the reference pressure.

Abstract: A process is provided for optimizing the production performance of a spinning machine. Each individual spinning position is separately monitored in relation to the number of end breaks and is adjusted to an optimal production speed. When this process is applied to an air jet spinning machine, the compressed air fed to the spinning positions is adjusted depending on the respective production speed.

Abstract: A process for preparing a piecing operation in an air jet spinning arrangement is described. The air jet spinning arrangement comprises a drafting device, whose main drafting zone is bordered on its entry side by an apron roller pair and on its exit side by a delivery roller pair. The apron roller pair is connected to a first drive, the delivery roller pair to a second drive. When the spinning process is interrupted, the delivery of a closed staple fiber strand is stopped in the main drafting zone and a new starting end of the staple fiber strand is created. This new starting end is to be pieced together with an end of a thread already spun. To create a new starting end of the staple fiber strand suitable for piecing, the apron roller pair and the delivery roller pair are each controlled separately when the spinning process is interrupted and are shut down one after the other, in such a way that in the main drafting zone a new starting end of the staple fiber strand is formed.

Abstract: A process and an arrangement for re-starting a previously interrupted spinning process in a spinning arrangement is provided. The arrangement includes a drafting unit which can be shut down and also an airjet unit including a vacuum chamber. For the purpose of removing an initially inhomogeneous fiber stream, a staple fiber strand, delivered by the re-operating drafting unit, is temporarily suctioned as waste via a deflecting device after it has left the drafting unit. Only then, when a homogeneous fiber stream has formed, is the staple fiber strand joined with a thread which is transported through the airjet unit. The inhomogeneous fiber stream is removed with the aid of the low pressure in the vacuum chamber.

Abstract: An air jet spinning machine for producing spun threads from staple fiber strands includes a number of spinning positions, to each of which compressed air nozzles are arranged for the purpose of generating the spinning twist. A joint compressed air regulator is connected upstream of the spinning positions, which regulator includes a pressure sensor and a regulating device. The compressed air regulator is set at a reference pressure, which corresponds to the unregulated static pressure prevailing when all spinning positions are in operation. In the case of a change in the static pressure, the compressed air regulator re-adjusts to the reference pressure.

Abstract: An airjet spinning arrangement includes a fiber feed channel, which runs into a vortex chamber, and a fiber withdrawal channel, which exits out of the vortex chamber. The fiber withdrawal channel is arranged in a spindle-shaped component, which can be moved away from the fiber feed channel by a moving device. In order to clean the area of the entry opening of the thread withdrawal channel, a cleaning channel is provided, which is directed against the spindle-shaped component and is connected to a pressurized air source. The cleaning channel runs into a ring channel, which surrounds the spindle-shaped component. A first exit opening of this ring channel is designed so that it forms a ring opening surrounding the spindle-shaped component and is directed against the spindle shaped component when the spindle-shaped component is moved away from the fiber feed channel.

Abstract: A process for preparing a piecing operation in an air jet spinning arrangement is described. The air jet spinning arrangement comprises a drafting device, whose main drafting zone is bordered on its entry side by an apron roller pair and on its exit side by a delivery roller pair. The apron roller pair is connected to a first drive, the delivery roller pair to a second drive. When the spinning process is interrupted, the delivery of a closed staple fibre strand is stopped in the main drafting zone and a new starting end of the staple fibre strand is created. This new starting end is to be pieced together with an end of a thread already spun. To create a new starting end of the staple fibre strand suitable for piecing, the apron roller pair and the delivery roller pair are each controlled separately when the spinning process is interrupted and are shut down one after the other, namely in such a way that in the main drafting zone a new starting end of the staple fibre strand is formed.

Abstract: A process is provided for optimizing the production performance of a spinning machine. Each individual spinning position is separately monitored in relation to the number of end breaks and is adjusted to an optimal production speed. When this process is applied to an air jet spinning machine, the compressed air fed to the spinning positions is adjusted depending on the respective production speed.

Abstract: A twin unit has two drafting devices for drafting fiber strands and is applicable in a spinning machine. The twin unit includes a common housing for the two drivable drafting devices, whereby the housing is detachably mounted in a machine frame. The drafting devices include a number of drivable bottom rollers and are arranged essentially mirror-symmetrical to one another. Each bottom roller has an area which drafts the fiber strand and is characterized in that the bottom roller has two bearing points. The two bearing points of each bottom roller are arranged one on either side of the area which drafts the fiber strand. In one variation, at least two opposite bottom rollers may form a bottom roller pair, in which the bearing points facing to the plane of symmetry of the twin unit are taken up in a joint bearing take-up. In addition, a top roller in the form of a twin pressure roller may be assigned to a bottom roller pair.

Abstract: A process and an arrangement for re-starting a previously interrupted spinning process in a spinning arrangement is provided. The arrangement includes a drafting unit which can be shut down and also an airjet unit including a vacuum chamber. For the purpose of removing an initially inhomogeneous fiber stream, a staple fiber strand, delivered by the re-operating drafting unit, is temporarily suctioned as waste via a deflecting device after it has left the drafting unit. Only then, when a homogeneous fiber stream has formed, is the staple fiber strand joined with a thread which is transported through the airjet unit. The inhomogeneous fiber stream is removed with the aid of the low pressure in the vacuum chamber.

Abstract: An airjet spinning arrangement includes a fiber feed channel and a thread withdrawal channel arranged downstream therefrom, which thread withdrawal channel is movable away from the fiber feed channel. An injector channel runs into the thread withdrawal channel, which injector channel is connectable to a compressed air source. The injector channel is arranged in a piston-like component, which piston-like component is movable away from the fiber feed channel by the compressed air fed to the injector channel.

Abstract: A process and an arrangement are described for a spinning arrangement comprising an airjet aggregate relating to the preparation for re-starting the spinning process after an interruption of the spinning process. An end of an already spun thread is hereby fed back through the airjet aggregate in the opposite direction to the operational direction of motion to a thread storer. The end of the thread is cut off in the thread storer as waste, by means of which a new thread end is created, which is prepared for the re-starting of the spinning process. The point of separation is prepared by means of blowing compressed air thereon, and the end to be discharged as waste is subsequently separated from the thread by means of pulling the thread apart. The thread storer is preferably designed as a suction tube, to which a nipping line for temporarily holding the thread, and a compressed air nozzle for blowing air the thread are assigned.

Abstract: An exchangeable reinforcing element for pressure rollers of drafting units of spinning machines. The reinforcing element comprises a thin reinforcing tube and a flexible roller covering securely affixed thereto which can be slid onto the pressure roller base body. The reinforcing element is cut from a long tube body to the required effective width. The roller covering is turned down at both ends in such a way that the reinforcing tube projects laterally over the roller covering.

Abstract: A holding device for a twin pressure roller of a drafting unit includes a number of bottom rollers. The twin pressure roller includes a stationary axle and two rotatably supported upper rollers. The holding device includes at least one positioning element assigned to the axle of the twin pressure roller and at least one force transmission element, wherein the positioning element is arranged in the area of the center of the axle of the twin pressure roller and thus permits the twin pressure roller to move in a pendulum fashion around the center. The holding device, together with the twin pressure roller may be lifted from the bottom roller. At least one catch bearing for approximate positioning during placement on the bottom rollers is assigned to the twin pressure roller. It may further be provided that the force transmission element is arranged separately from the positioning element and that the catch bearing is integrated into the force transmission element.

Abstract: A twin unit has two drafting devices for drafting fiber strands and is applicable in a spinning machine. The twin unit includes a common housing for the two drivable drafting devices, whereby the housing is detachably mounted in a machine frame. The drafting devices include a number of drivable bottom rollers and are arranged essentially mirror-symmetrical to one another. Each bottom roller has an area which drafts the fiber strand and is characterized in that the bottom roller has two bearing points. The two bearing points of each bottom roller are arranged one on either side of the area which drafts the fiber strand. In one variation, at least two opposite bottom rollers may form a bottom roller pair, in which the bearing points facing to the plane of symmetry of the twin unit are taken up in a joint bearing take-up. In addition, a top roller in the form of a twin pressure roller may be assigned to a bottom roller pair.