Abstract: A spinning rotor (1) with a spinning cup (2) has an interior surface coated with a nickel dispersion layer (6) of an essentially even layer thickness having a concentration of hard material grains (7) embedded therein which is clearly less at the surface of the fiber slide face (9) than in the rotor groove. The coating is produced by bathing the spinning cup in a nickel dispersion bath during the final stage of which the concentration of the hard material grains in the bath is reduced at least in the bathing area, while the spinning cup is moved in this bath and rotated around its longitudinal axis while maintaining the spinning cup in a spatial orientation relative to the bath wherein an imaginary plane passing through the rotor groove is at least approximately perpendicular to the surface of the nickel dispersion bath.

Abstract: A central magazine (11) of a tube feeding device of a textile machine, for example an automatic cheese winder (1), has a central unit (50) with an integrated tube transfer device and an exchangeable tube storage unit (51) fixed in place on the central unit (50). The tube transfer device comprises a vertically displaceable gripper support (16) with at least one positively controllable tube gripper (17). The storage unit (51) has several storage columns (12 to 15) arranged next to each other, each having a number of feed shafts (22) arranged atop each other. The tube grippers (17) on the gripper support (16) take the tubes (8) from the feed shafts (22) and transfer them to a tube transport carriage (20) of a tube conveying device (10) extending over the length of the machine, which carriage can be displaced between a position above the respective storage columns (12 to 15) of the central magazine (11) and interim reservoirs (9) which are a part of the winding stations.

Abstract: An open-end spinning device (1) with a spinning rotor (3) whose spinning cup rotates at a high speed in a rotor housing (2) loaded by a vacuum and closed by a yarn guide plate. A fiber guide conduit (14), arranged between a sliver opening device (26) and the spinning cup, has a wall section with an elevated coefficient of friction comprised of conduit sections (29, 30) of different surface roughnesses. The wall of the entrance-side section (29) of the fiber guide conduit has a distinctly greater surface roughness (R.sub.t) than the wall of the exit-side section (30) of the fiber guide conduit.

Abstract: In order to improve the traveling and sliding properties of a yarn during its further processing, in particular for knitting, it is waxed during rewinding in cheese winding machines by passing it along a paraffin body. When the paraffin body is used up, the unwaxed yarn can cause yarn breaks or even needle breakages, which leads to production errors or lost production. At the winding stations, the drive of the friction drum is switched on and off at intervals to cause alternating acceleration phases with slippage between the friction drum and the bobbin and intervening slippage- free run-out phases to prevent pattern windings. The slippage is monitored over the course of the winding operation. If the slippage decreases in successive acceleration phases and remains at a low level, while the drive output of the friction drum remains unchanged, this is interpreted to indicate an outage of the paraffin application.

Abstract: In a method and apparatus for determining a variation in criteria, parameters and/or command values of an automatic piecing operation at an automatic piecing apparatus of an automatic spinner, a piecer and/or a length of thread in which the piecer is located is measured in accordance with criteria of diameter or diameter per unit of length and evaluated for improving the piecer, with at least one sensor disposed in a thread travel path, upon resumption of winding after a piecing operation in which a spun yarn is received. A piece of thread containing the piecer is scanned by measuring with the at least one sensor in terms of location of thick and/or thin places with respect to the piecer at defined measurement points, as further criteria of the piecing operation. The measured data are continuously input into event counters connected downstream of the at least one sensor.

Abstract: A yarn withdrawal nozzle (20) for an open-end rotor spinning device (1) has a yarn inlet zone (29) tapering in a funnel-like manner into a yarn withdrawal conduit (21), with the yarn inlet zone being formed with both a spiral structure (30) as well as additional notches (34) in the inlet area of the yarn withdrawal conduit (21). As viewed in the yarn withdrawal direction (A), the notches (34) are either arranged following the spiral structure (30) or at least partially in the area of the spiral structure (30).

Abstract: An open-end spinning device having a spinning rotor housed within a rotor housing which includes a yarn conduit plate for closing the front side of the rotor housing and a conduit plate adapter, defining a mouth area of a yarn conduit guide and including a yarn draw-off jet, which is removeably arranged in a receptacle of the yarn conduit plate and is easily and quickly replaced in connection with the replacement of a rotor, while providing a reliable and tight fastening of the conduit plate adapter in the open-end spinning device. The conduit plate adapter comprises an extension including fixing elements which can be secured by a fixing arrangement which is movably arranged for selectively abutting the fixing elements for fixing the conduit plate adapter within the receptacle of the yarn conduit plate.

Abstract: A tube feeding device for cheese-producing textile machines (1), has a tube magazine (11) arranged on the end of the machine, interim tube reservoirs (9) which are part of the winding stations, and a conveying device (10) for distributing the empty tubes (8) to the interim tube reservoirs of the winding stations. The conveying device (10) comprises a track (18) which horizontally extends over the length of the machine and has spaced windows (23), along which a control strip (19), which has correspondingly spaced windows (24), is displaceably seated, as well as a tube transport carriage (20), which can be displaced between the tube magazine (11) and the interim tube reservoirs (9). The tube transport carriage (20) has a magnetically actuable tube gripper device (21), which can be positively controlled by the axial displacement of the control strip (19).

Abstract: A cheese-producing textile machine 1 with a central control unit 37 and a plurality of winding stations 2 which are serviced by an autonomously operating service unit 23. The central control unit 37 of the textile machine 1 is connected via a machine bus 40 with individual winding station computers 39 as well as with a control device 38 of the service unit 23. Control programs A, B, C, D, etc. are stored in the control device 38 of the service unit 23, and are specially adapted to various respective structural configurations of the service unit 23. It is possible in a simple manner to activate the control programs A, B, C, D, etc. in correspondence to the particular prevailing structural configuration of the service unit 23 by means of appropriate software encoding via an input element 41 on the central control unit 23.

Abstract: In an open-end spinning machine (1) with a plurality of open-end spinning devices (3), each having a spinning rotor (15) whose rotor shaft (26) is seated in the bearing wedge of an axial thrust-free support disk bearing (27) and is positioned by a magnetic bearing (29), and a service unit (10), which automatically services the spinning devices, a sensor device (41) is provided on the service unit (10), which is connected to the control device (18) of the service unit (10) and checks an identification marker (34) applied to each spinning rotor (15). The control device (18) actuates a yarn piecing operation by the service unit only upon detection of an identification marker (34) identifying the spinning rotor (15) to be compatible with the associated spinning device.

Abstract: An open-end spinning device 1 with a bearing arrangement for supporting a spinning rotor 3, which is seated so it can rotate at high turning frequency and is electrically insulated in relation to the housing of the spinning device and of the bearing. The static charge being created on the spinning rotor 3 during the spinning process is diverted to a grounded component of the spinning device 1 by means of an electrical conducting mechanism. The electrical conducting mechanism 40 is arranged in the area of the axial bearing 18.

Abstract: In order that stray fibers do not settle in the rotor during the spinning start process at the spinning box of a rotor spinning machine, an openable air valve is provided for initially cleaned the rotor by delivering an air current into the rotor either by drawing ambient air through the valve as a consequence of the spinning vacuum or by blowing in compressed air through the valve. As an alternative to known spring-loaded ball valves pose the danger that the spring ceases to perform due to deposits of dust and fibers, the present invention provides a magnet arranged in association with the valve seat in the area of its valve opening to attract the ball, which consists of a magnetizable material, and thereby hold the ball in closed position.

Abstract: In a simplified method for preventing pattern windings in a winding process for producing random wound yarn packages at a winding station of a winding machine, either the circumferential speed of a yarn package or the traversing speed of a yarn guide is selected as a command variable and the other as a secondary variable. Then, in the winding process the winding roller of the winding station is accelerated and decelerated and the yarn guide is accelerated and decelerated so that each variable varies between respective predetermined maximum and minimum values.

Abstract: In the course of regulating an electronically commutated d.c. motor as the drive motor of a winding device of a textile machine, the resolution of known angular rotation sensing systems is insufficient to assure a jerk-free drive of the drum at low rpm. It is therefore proposed by the invention to introduce a so-called Luenberger observer into the regulating circuit for regulating the motor rpm in which the signals of the angular rotation sensing system for the commutation of the motor are generated.

Abstract: A rotor brake (8) for an open-end spinning rotor rotating at a high speed in a rotor housing with its rotor shaft (2) rotatably supported in the bearing nip (3) of a support-disk bearing (4). The rotor brake (8) comprises brake levers (9, 10) having a replaceable brake lining (16, 26) on their ends engagable against the rotor shaft (2). The brake linings (16, 26) are manufactured from a carbon-fiber composite material resistant to changes in temperature.

Abstract: An open-end spinning device comprises a spinning rotor rotating in a vacuum-loaded rotor housing which can be closed by a conduit plate having a receptacle receiving a replaceable conduit-plate adapter and a locking device, e.g., a bar spring, for spring-biasing the conduit-plate adapter into the receptacle. A blocking device comprising a hood-like cover is associated with the locking device for movement into an operating position only when the locking device is positioned in a locking position in which it reliably fixes the conduit-plate adapter.

Abstract: A mechanically operating debris removal device for an open-end spinning machine 1 comprises a guide conduit arranged below the spinning units and enclosing a debris conveyor belt. The guide conduit comprises a base and a cover, which may be pivotable or detachable relative to the base. During spinning operation, the base and the cover form an essentially closed belt guide conduit. Debris passage openings are formed in the cover with associated air and debris guide deflectors to communicate with debris exit openings in the sliver opening devices. The upper run of debris conveyor belt creates a slight suction flow in guide conduit and at the debris passage openings to prevent fine debris from settling in the area of the debris passage openings and in the area of debris exit openings of the sliver opening devices.

Abstract: An open-end spinning device has a spinning rotor (3) supported by its rotor shaft (4) in the bearing nip of a support-disk bearing (5) and positioned by a magnetic thrust bearing (18). The magnetic thrust bearing (18) comprises a stationary bearing component (41) with permanent-magnet rings (42, 43) which are enclosed by pole disks (44, 45, 46) and a replaceably arranged bearing component formed of ferromagnetic annular attachments (32, 33, 34) arranged on the rotor shaft (4) which rotate with the spinning rotor. The rotor shaft (4) comprises on one end a bearing area (35) with offset diameter and with at least three ferromagnetic annular elements (32, 33, 34) arranged at the spacing of the pole disks (44, 45, 46), with the ferromagnetic annular elements being optimized as regards their design and arrangement.

Abstract: In open-end rotor spinning devices, an axial engagement element, typically a ceramic pin, is inserted as a wear protector in a receptacle at the free end of the rotor shaft which is supported on a ball of an axial bearing. In order to receive the air displaced during the insertion of the axial engagement element, the free end of the shaft is formed with at least one radial bore connecting the receptacle with the ambient environment through which the air displaced during the insertion can escape.

Abstract: In open-end rotor spinning devices, an axial engagement element, typically a ceramic pin, is inserted as a wear protector in a receptacle at the free end of the rotor shaft which is supported on a ball of an axial bearing. In order to receive the air displaced during the insertion of the axial engagement element, the axial engagement element is formed with a bore in the end thereof facing inwardly within the receptacle.