Abstract: The rotor cover (2) of an open-end spinning machine possesses a projecting cover cap (3) with a side recess (4), which, on its end remote from the rotor cover is bordered by a collar (40). This possesses both in the partial zone of its circumferential area containing the collar (40), and in the remaining circumferential zone, essentially the same outer contour. The recess (4) begins, relative to the direction of rotation (f) of the spin rotor 1, between 30° and 130° after the discharge opening (50) of the fiber feed conduit (5) and ends at a section of the of the wall (51) protruding from the radial surface (20) of the rotor cover (2). The recess (4) extends to a radial surface (20) of the rotor cover (2) which radial surface (20) covers the open side of the spin rotor.

Abstract: The rotor cover (2) of an open-end spinning machine possesses a projecting cover cap (3) with a side recess (4), which, on its end remote from the rotor cover is bordered by a collar (40). This possesses both in the partial zone of its circumferential area containing the collar (40), and in the remaining circumferential zone, essentially the same outer contour. The recess (4) begins, relative to the direction of rotation (f) of the spin rotor 1, between 30° and 130° after the discharge opening (50) of the fiber feed conduit (5) and ends at a section of the of the wall (51) protruding from the radial surface (20) of the rotor cover (2). The recess (4) extends to a radial surface (20) of the rotor cover (2) which radial surface (20) covers the open side of the spin rotor.

Abstract: The present invention relates to a device for the control of an air stream in an open-end spinning device (6). The open-end spinning device (6) is equipped with an air channel (8) opening into the second housing compartment (600) of the open-end spinning device (6), which is connected via a valve (82) to a connection opening (83). An air channel (95) with a presentation end (950) located on a traveling service carriage (9) can be presented to this connection opening (83). This presentation end (950) is connected by means of a movable intermediate segment (951) to the air channel (95) and is capable of movement relative to same so that when the connection opening (83) is swiveled, it follows this movement without changing its position relative to the connection opening (83).

Abstract: The present invention relates to a device for the conveying of fibers from an opener roller (31) installed in a fixed opener roller housing (30) to the collection surface (43) of a spinning rotor (4) of an open-end spinning device (1). It is provided with a rotor lid mounted on a swivel pin which receives a fiber feeding channel (6). The fiber feeding channel (6) can be brought into contact with a first contact surface (62) surrounding its inlet opening (60) against a second contact surface (35) located on the opener roller housing. It extends until directly in front of the collection surface of the spinning rotor (4). A lid extension extends through an opening in the spinning rotor (4) into the spinning rotor. In the lid extension the fiber feeding channel (6) lets out into the spinning rotor (4). The contact surfaces are essentially tangential to the circumferential surface of the opener roller and parallel to the opening of the spinning rotor or are inclined towards the opening of the spinning rotor.

Abstract: With channels for the conveying of fibers, fiber slivers or yarns on spinning machines, problems are encountered in their manufacture. The channels must be made with a certain inside contour, where at the same time the quality of the surface inside the channel must be very good. The high surface quality is required in order to ensure trouble-free conveying. A channel is therefore proposed which is made as a tubular component, consisting of a metallic material and which has been produced by forming its interior by a medium under pressure. It is proposed for an open-end rotor spinning device to form the conveying channel separately from the other components of the lid of the rotor housing and to insert the channel into the lid. It is proposed in that case to use a channel according to the design shown above.

Abstract: A method and system for maintaining spinning machines having a plurality of spinning stations include automatically positioning a maintenance unit proximate to the spinning stations for removing spinning components from the spinning stations and replacing the removed spinning components with replacement spinning components. The maintenance unit is configured to remove the spinning component from the spinning station for servicing, to immediately replace the removed spinning component with a replacement spinning component which is carried by the maintenance unit, and to transfer the removed spinning component to a remote service station. The removed spinning component is serviced at the service station and is subsequently picked up by the maintenance unit for subsequent installation into another spinning station.

Abstract: A process for cleaning an open-end spinning rotor which has a fiber collection channel and an open edge, which is covered by a rotor cover. A first compressed-air stream is directed towards the fiber collection channel in a first cleaning phase. Then, in a second cleaning phase, the spacing between the open edge of the spinning rotor and the rotor cover is increased. In addition, a suction air flow leaving the spinning rotor over its open edge is produced. To carry out this process, there is associated with the rotor cover an opening apparatus which is connected, together with at least one blower channel to a common control apparatus.

Abstract: A device for the storage of a yarn of limited length spun on a spinning machine, comprising a suction pipe and a yarn storage chamber. The suction pipe is connected to a negative-pressure line and serves to seize the yarn by means of suction air. The yarn storage chamber is located between the negative pressure line and the suction pipe. The yarn can be aspirated into the yarn storage chamber and can be drawn off once more in the direction opposite to the direction of aspiration. The yarn storage chamber is located in a body which is rotatably mounted.In the process for the storing of the yarn, the yarn is seized by the stream of suction air and is sucked through the suction pipe into the yarn storage chamber. The yarn is accumulated against the screen surface of the yarn storage chamber until the stream of suction air in the suction pipe is weakened to a point where additional aspiration of more yarn is prevented.

Abstract: In order to piece to an open-end friction spinning device with two friction spinning elements driven in the same direction and forming a nip subjected to suction, fibers fed into such nip are twisted into a fiber bundle. The fiber bundle is partially conveyed out of the nip in a longitudinal direction, grasped there, and then transferred to a winding device. An auxiliary conveying device is provided to convey the fiber bundle from a thread forming zone adjacent the spinning element nip up to the draw-off side end of such friction spinning elements. A grabber is provided to grasp the fiber bundle as it leaves such nip of the friction spinning elements and to transfer the forming thread to a draw-off device.

Abstract: To piece up to a spinning station consisting of two friction spinning elements (101) driven in the same direction and forming a nip, a thread 30 is conveyed to the nip so that said thread 30 reaches the thread forming zone (104) with its free thread end first. Feeding of the fibers into the nip is controlled so that the thread end (300) comes into contact with the fibers simultaneously with its reaching the thread forming zone (104). The friction spinning elements (101) are covered by a cover (130) which incorporates a fiber feeding channel (24). The cover, in addition to the fiber feeding channel (24), is equipped with a thread insertion slit (14) extending essentially in the longitudinal direction of the friction spinning elements (101). The thread insertion slit (14) extends from the outside of the cover (130) up to its inside, and from the end on the draw-off side up to the outlet end (240) on the side away from the drawoff.

Abstract: When a thread is joined in an open-end spinning device, the thread is fed back into the open-end spinning device as a result of reverse rotation of a bobbin and a pair of auxiliary rollers. After the feedback has ended, the thread is released by the pair of auxiliary rollers and, until normal spinning draw-off is started, the thread is subjected to an auxiliary draw-off at a greater distance from the open-end spinning device than the normal spinning draw-off. This auxiliary draw-off can be carried out exclusively by means of the bobbin or also independently of it. An auxiliary draw-off device serves for generating this drawing force and is located at a greater distance from the open-end spinning device than the pair of draw-off rollers.

Abstract: To stop and restart and open-end spinning machine with a plurality of spinning devices, all the spinning devices are stopped together, while the vacuum is maintained. The thread end resulting from this interruption in the spinning process is then prepared successively at each spinning unit for joining and is fed to the spinning device in a thread-joining position, whereupon the vacuum is then cut off. When the open-end spinning machine is started, after the vacuum has first been applied, the threads are fed together, on all the spinning devices to the fiber-collecting surfaces of the spinning devices. The open-end spinning machine has a service device movable along the machine for preparing the threads to be joined and for feeding them to the individual spinning cells, as well as a central control device which has a stoppig device and a starting device for the open-end spinning machine. The stopping device is connected in control terms to a switch-on device and to a switch-off device for the service device.

Abstract: A thread-reserve winding is formed on a bobbin tube of a spinning machine in which the thread is drawn off continuously from the spinning machine by means of a pair of draw-off rollers and, to form the thread-reserve winding, is grasped and wound onto the bobbin tube. According to the invention, immediately after the thread has been grasped, the spinning tension is put into effect to wind on the thread-reserve winding and, after the thread-reserve winding has been applied, the thread is wound on under the normal winding-on tension. In this way, the thread is drawn off by the bobbin tube under a thread tension sufficient to ensure a taut winding.

Abstract: The yarn (31) is fed substantially tangentially from a feed station (30) to the feed end (101) of an accumulator roller (10) of a yarn accumulator (1), drivable by a rotary drive means (120). The yarn is dischargeable from an exit end (103) of this accumulator roller (10) counter to the action of a restraining element (14) through a yarn guide means (4) arranged in prolongation of the axis (122) of the accumulator roller. The restraining element (14) is of radially outwardly open construction and is formed by a yarn restraining ring drivable relative to the accumulator roller (10). The ring includes a radially outwardly open yarn restrainer (141). The yarn guide means (4) consists of two mutually separable yarn guide components (40, 41) and is constructed as a yarn conveyor which deflects the yarn (31) out of a prescribed yarn path (32) into a yarn path intersecting the path of the revolving yarn restrainer (141).

Abstract: In order to wind a newly joined thread onto a tube newly inserted on a spooling device on an open-end spinning mechanism, the newly joined thread, together with a thread portion containing a leader, is guided away before the start of the bobbin build-up. Thereupon, the thread portion containing the leader is severed from the thread, and subsequently, the thread supplied by the open-end spinning mechanism is transferred to the newly inserted tube. To exchange a full bobbin for a new tube, a thread break is produced, the open-end spinning mechanism is cleaned and the thread is thereupon joined anew. To carry out this process, there are, on an open-end spinning mechanism, provided with a thread-joining device and a spooling device, a thread-suction device (4), a thread feeder (42) transferring the thread (35) supplied to the thread-suction device (4) to a newly inserted tube, and a thread-severing device (41) assigned to the thread-suction device (4).

Abstract: A device and method for securing a reserve winding of thread on a tube supported on winding apparatus having a main thread guide and a thread delivery source wherein a reserve winding is formed from thread extending to a thread-holding device and thereafterwards severed with the free end of the reserve thread deflected toward the longitudinal center of the tube and covered with thread subsequently laid by the main thread guide.

Abstract: A device and method for securing a reserve winding of thread on a tube supported on winding apparatus having a main thread guide and a thread delivery source wherein a reserve winding is formed from thread extending to a thread-holding device and thereafterwards severed with the free end of the reserve thread deflected toward the longitudinal center of the tube and covered with thread subsequently laid by the main thread guide.

Abstract: A method and apparatus for picking up a yarn and transferring it to an empty pirn following exchange with a full bobbin on a yarn winding unit on which yarn is extended between a pair of yarn draw-off rolls and a yarn holding device includes a pair of auxiliary draw-off rolls intermediate the draw-off rolls and the yarn holding device for positively drawing yarn from the draw-off rolls to produce a forced conveyance zone therebetween in which the yarn is conveyed essentially without strain and a yarn grabber device for grasping the yarn in the forced-conveyance zone and drawing out the yarn far into the region of a yarn catching device carried on the pirn.