Abstract: For an aerostatic bearing (6) of an open-end spinning rotor, in which the bearing material consists of a wearable material, a wear indicator (9) is provided on the bearing plate (601) of the axial bearing (6) so that the state of wear of the axial bearing (6) can be checked by simple optical inspection. The wear indicator (9) can be integrated into the running surface (610) and be made e.g. in the form of a blind bore (91), so that the presence of the bore indicates that the wear lies still within the admissible limits.

Abstract: For an opener roller for an open-end spinning device provided with a basic body by which it is connected to a supported shaft for rotatable support, it is proposed that the clothing be attached to the basic body via a clothing holder, whereby fasteners are used. For the fixed allocation of the clothing holder to the basic body it is provided that the attachment of the clothing holder by means of the fasteners be effected from the side of the opener roller which is facing the shaft bearing. The face of the opener roller away from the shaft covers the shaft, so that this face of the opener roller is also an even surface.

Abstract: An aerostatic axial bearing (6) of an open-end spinning machine in which the bearing plate (601) of the axial bearing (6) is made of a permeable material, has a bearing plate (601) provided with one or several air channels (605), the task of which is to convey the air closer to the bearing gap (630) before it goes through the permeable bearing plate material. Thereby, the utilization of an additional choke can be avoided. Furthermore the mechanical properties of the holder bearing plate (601) are improved.

Abstract: An open-end spinning device with a spinning rotor is supported by a shaft in a bearing arrangement. An axially rearwardly directed force is exerted on the rotor shaft in operation of the spinning device. The end of the rotor shaft bears against an aerostatic bearing which includes a bearing surface oppositely facing the end of the rotor shaft made of a carbon material. The rotor shaft has a bearing surface defined on the end thereof opposite the aerostatic bearing which is made at least in part of a carbide material.

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 yarn draw-off device for use with a spinning machine includes a pressure roller and a rotatably driven draw-off shaft. The pressure roller is in contact with the draw-off shaft and is rotatably driven by the shaft. An adjustable mounting device is provided for the pressure roller. The pressure roller is rotatably mounted on the mounting device. The mounting device is selectively movable relative to the draw-off shaft so as to vary the contact pressure between the pressure roller and the draw-off shaft.

Abstract: In the recess of a housing (4) of an open-end spinning device containing a driven opener roller (40), an insertion piece (32) is provided which contains the first channel part (30) of a fiber feeding channel. The insertion piece (32) is installed in housing (4) by an elastic retaining element in such a manner as to be replaceable. The retaining element may be part of a catch and be formed for this purpose by a ring or pot-like insert (43) which lines the interior of the housing (4) containing the opener roller (40) and which has technologically necessary openings (430, 432, 431) in its circumferential wall. The edges of the lateral walls of the first channel part (30) towards the ring or pot-shaped insert are adapted to the curvature of the insert (43). These lateral walls extend, relative to a perpendicular dropped from the center of the insert (43) on the longitudinal axis of the insertion piece (32), up to the side of the perpendicular (323) away from the spinning element (10).

Abstract: The spinning rotor of an open-end spinning device is supported by means of a rotor shaft in the nip of at least one pair of supporting disks and can be driven by means of a tangential belt. A change-over device with a pressure roller is provided to press the tangential belt against the rotor shaft and a rotor brake which can be brought into action alternatively is provided. The change-over device is connected to a control lever which can be controlled as a function of the position of an actuator connected to a spinning station cover. The control lever is provided with an actuating arm. By opening the spinning station cover completely, a sufficient clearance can be produced between the actuator and the control lever so that the rotor brake can be deactivated through action exerted on the actuating arm of the control lever by means of the change-over lever on the one hand without allowing on the other hand the pressure roller to be yet actuated.

Abstract: To attach spinning rotors to their rotor shaft, the rotor shaft is provided with a stop against which the collar for the seating of the spinning rotor bears. The stop can be made in one piece with the rotor shaft, and be in the form of a micro-stop against which the collar bears in an axial direction.

Abstract: An open-end spinning machine having a spinning rotor attached to a shaft is provided wherein the shaft of the spinning rotor is driven by driving means. The shaft of the spinning rotor is held in the nips of pairs of rearward and forward supporting disks. During spinning operations, an axial force is generated in the axial direction of the free end of the rotor shaft. The open-end spinning device further comprises a radial support surrounding at least a portion of the circumference of the rotor shaft and disposed at least in part in the area between the free end of the shaft and the area of the shaft acted upon by the rearward pair of disks.

Abstract: An open-end spinning machine having a spinning rotor attached to a shaft is provided wherein the shaft of the spinning rotor is driven by a driving device. The shaft of the spinning rotor is held in the nips of pairs of rearward and forward supporting disks. During spinning operations, an axial force is generated in the axial direction of the free end of the rotor shaft. The open-end spinning device further comprises a radial support surrounding at least a portion of the circumference of the rotor shaft and disposed at least in part in the area between the free end of the shaft and the area of the shaft acted upon by the rearward pair of disks.

Abstract: An open-end spinning machine with a machine frame with at least one section. The latter is provided for each longitudinal machine side with a rigid structural unit which consists of several longitudinal structural elements and two end walls. Intermediate walls are provided at least between two adjoining pairs of spinning stations. These intermediate walls are rigidly connected to the longitudinal structural elements as are the intermediate walls, whereby the groups of technological spinning elements, including the parts of drive units and the winding mechanisms are attached to longitudinal structural elements and/or to the intermediate walls. The end walls of the two structural units are connected to each other in pairs.

Abstract: A bearing setup is provided for the supporting disks of an open-end spinning machine, the supporting disks being supportively fixed on the ends of a shaft extending through a bearing sleeve of a supporting disk bearing. The bearing setup includes a fastening system configured with the bearing sleeve so that the supporting disk bearing can be readily and easily removed from the pillow block of the spinning machine without disassembly of the pillow block from the machine frame. The fastening system may include a threaded bore defined in the axial sleeve for engagement with a threaded screw member extending through the pillow block.

Abstract: A process and apparatus for the control of a yarn storage mechanism on a spinning mill machine is proposed. When yarns are wound up it may occur, e.g. in forming conical bobbins, that more yarn is delivered than is wound up. The yarn which is briefly in excess is here taken up in form of a yarn loop by a compensator arm which intervenes transversely in the course of the yarn and is mounted so as to be capable of swivelling. According to the invention it is proposed that the compensator arm be subjected to the force of a spring which acts upon it increasingly as the yarn loop decreases, and in that the force of an additional elastic element acts upon the compensator arm as further excursion occurs.

Abstract: A process for responding to a malfunction at an open-end spinning station of an open-end spinning machine which requires piecing of the yarn at the spinning station. The process is for use in open-end spinning machines having a travelling service unit which travels alongside adjacently dispose spinning stations for servicing the spinning stations. The process includes summoning the traveling service unit to the malfunctioning spinning station and attempting piecing at the spinning station with the service unit for at least 2 attempts. Before each of the piecing attempts, the spinning rotor of the station is cleaned of fiber and debris before each of the piecing attempts.

Abstract: In an open-end spinning machine is provided with a plurality of spinning stations installed next to each other. Each station having a spinning element part of a drive unit, and an opener unit contained in several assemblies. A plurality of longitudinal structure elements are provided to which the assemblies of the spinning device are attached. The longitudinal structural elements are interconnected by transversal bracing. The transversal bracing may be an intermediate wall.

Abstract: A yarn is fed at a piecing speed to the fiber collection surface of a spinning rotor. It is there combined with the fibers of a fiber ring and is then drawn off from the spinning rotor in the form of a continuous yarn while fibers newly fed into the spinning rotor continue to be incorporated in the yarn. The rotor speed is changed, immediately after piecing, from the piecing speed to a rotational speed which is lower than the piecing speed. The rotor speed is then increased to the production speed. In this manner, optimal conditions are achieved with respect to propagation of twist and draw-off of the piecing joint. To carry out this process, elements are provided for the reduction of the rotor speed from piecing speed to a lower value, for renewed acceleration of the rotor speed after a desired minimum value has been reached of after the passage of a predetermined period of time, as well as elements to tie the accelerating rotor speed to the desired production speed.

Abstract: A yarn is fed at a piecing speed to the fiber collection surface of a spinning rotor. It is there combined with the fibers of a fiber ring and is then drawn off from the spinning rotor in the form of a continuous yarn while fibers newly fed into the spinning rotor continue to be incorporated in the yarn. The rotor speed is changed, immediately after piecing, from the piecing speed to a rotational speed which is lower than the piecing speed. The rotor speed is then increased to the production speed. In this manner, optimal conditions are achieved with respect to propagation of twist and draw-off of the piecing joint. To carry out this process, mechanisms are provided for the reduction of the rotor speed from piecing speed to a lower value, for renewed acceleration of the rotor speed after a desired minimum value has been reached after the passage of a predetermined period of time, as well as mechanisms to tie the accelerating rotor speed to the desired production speed.

Abstract: A yarn draw-off pipe for drawing off a yarn from an open-end spinning device. The draw-off pipe is equipped with first and second pipe sections, which are connected to each other through a connecting piece. The connecting piece contains a chamber and is provided with a deflection surface extending into the chamber. The latter is part of an insert. The connecting piece is provided with an insertion opening for this insert on its side towards the spinning element, when assembled, the insert is secured axially between the front end of the insertion opening and the first pipe section or, alternatively, between the two pipe sections. The insert is made of a ceramic material and, with its end towards the spinning device, projects radially beyond the outside diameter of the first pipe section. The area of the guide left free by the insert is filled with a plastic material.

Abstract: A device for the control of an open-end spinning element, including a pivoted control lever (4) is provided which is capable of assuming three different working positions. In a production position the control lever brings a first drive, running at production speed, into driving contact in the operation of the open-end spinning element. In a braking position the control lever brings a brake to act upon the spinning element. The control lever in a piecing position brings a second drive which runs at a lower speed than the first drive into driving contact with the open-end spinning element. At least the positions determining the production and the piecing position of the control lever are provided with a common control element, capable of being moved back and forth in the direction of movement of the free end of the control lever between at least two switching positions.