Abstract: A method for producing a rotor cup for an open-end spinning rotor includes forming separating structures on a front-side rim of the rotor cup for breaking up and preparing a yarn end for piecing. The separating structures are formed by a non-mechanical manufacturing method without contact between the front-side rim and a mechanical forming tool. A rotor cup formed in accordance with the method is also provided.

Abstract: An application system component is provided in the form of a changeable application member such as a nozzle or a bell cup. The application system component includes a transponder for storing component data, from which the component data is readable, and a wear detection device for monitoring of the application system component. The wear detection device includes a wear mark and an optical detector.

Abstract: In an open-end spinning rotor with a rotor cup, and with a rotor shaft, through which the spinning rotor is supported in a bearing, the rotor shaft and the rotor cup are detachably connected to each other through a coupling device. The coupling device includes a positive-locking connection for the transmission of the turning moment between the rotor cup and the rotor shaft, along with a magnetic device for the axial connection of the rotor shaft and the rotor cup. The rotor shaft features at least one projection with a one turning moment-transmitting area, which engages in a recess of the rotor cup with a turning moment-transmitting counter-area. A socket for a permanent magnet is arranged on the rotor cup.

Abstract: An open-end spinning rotor (1), comprising a rotor shaft (4), a rotor cup (2) and a coupling device (3) releasably connecting the rotor shaft (4) and rotor cup (2). The coupling device (3) has locking bodies (6), arranged in a holding element (5) and lock the rotor cup (2) and the rotor shaft (4) in the axial direction under centrifugal force during operation of the open-end spinning rotor (1). A resilient element (7) is associated with the locking bodies (6) and cooperates with the locking bodies (6) such that the locking bodies (6) also lock the rotor cup (2) to the rotor shaft (4) in the axial direction at a standstill. The holding element (5) is configured as a pin which is formed such that it produces a positive shaft-hub connection between the rotor shaft (4) and rotor cup (2) in conjunction with a correspondingly formed hub (8).

Abstract: A yarn comprising gel forming filaments or fibres particularly one used to make a woven or knitted wound dressing or other gelling fabric structure. The invention provides a yarn comprising a blend of from 30% to 100% by weight of gel-forming fibres and 0% to 70% by weight of textile fibres. Process for making the yarns are also described including those using rotor spinning.

Abstract: An open-end spinning device (1) with a spinning rotor (2) whose shaft end (11) is supported by an aerostatic axial bearing (10) with an air gap (18) located between a bearing plate (17) of the axial bearing (10) and the shaft end (11). The aerostatic axial bearing (10) comprises a bearing plate (17) and a throttle device (19) made from a porous graphite material placed before the bearing plate (17). The throttle device (19) is an stamped pressed, tablet-shaped molding with largely homogenous porosity. In a process for manufacturing an aerostatic axial bearing (10) for a spinning rotor (2) of an open-end spinning device (1), a throttle device (19) made from a porous graphite material is placed before the axial bearing (10). The throttle device (19) is stamped pressed in a press tool as a tablet-shaped molding.

Abstract: A system for activating a rotor drive (31) of an open-end rotor spinning machine (30), having an open-end rotor spinning machine (30) with a plurality of workstations (33), each having a rotor drive (31) with a control unit (4), which comprises at least one communication interface (18, 19) for connecting to a workstation control unit (35), and external means for substitute activation of the individual rotor drives (31) and for reading signals representing operating state data of the rotor drive from the individual control units (4) of the rotor drives (31) by means of at least one communication interface (18, 19) of the control units (4) for adjustment and checking purposes.

Abstract: The invention relates to a method for operating an open-end spinning device (1), comprising a spinning rotor (2) and an opening roller (12), which can be controlled so as to be driven individually independently of one another, wherein after an interruption in the spinning process takes place as a result of the detection of the absence of a thread, a piecing operation is initiated, comprising a piecing process, in which an upper thread passes through a fiber ring formed in the spinning rotor (2) and is connected to the latter, and a subsequent drawing-in accumulating process which serves to reduce a thin point in the thread following the piecer, wherein during the piercing operation, the opening roller (12) is temporarily driven at a piecing speed which is higher than the operating speed of the opening roller (12).

Abstract: Spinning rotor (1) for an open end rotor spinning machine comprising a rotor shaft (2), a rotor cup (3), which has an opening (4), an inner chamber (5), a rotor groove (6), a conically widening slide wall (7) extending from the opening (4) to the rotor groove (6) and a rotor base (9) arranged opposing the opening (4) and designed with a bore (8), through which the rotor shaft (2) extends at least partially. The rotor shaft (2) is connected by means of a connection element (10) to the rotor cup (3) and the rotor shaft (2) and rotor cup (3) comprise a common rotational axis (13). The rotor shaft (2) and the rotor cup (3) have connection means (11, 12), which are at least partially surrounded by the connection element (10) configured as a cast part, so a positive connection of the rotor shaft (2) to the rotor cup (3) can be achieved.

Abstract: Spinning rotor (1) for an open end rotor spinning machine comprising a rotor shaft (2), a rotor cup (3), which has an opening (4), an inner chamber (5), a rotor groove (6), a conically widening slide wall (7) extending from the opening (4) to the rotor groove (6) and a rotor base (9) arranged opposing the opening (4) and designed with a bore (8), through which the rotor shaft (2) extends at least partially. The rotor shaft (2) is connected by means of a connection element (10) to the rotor cup (3) and the rotor shaft (2) and rotor cup (3) comprise a common rotational axis (13). The rotor shaft (2) and the rotor cup (3) have connection means (11, 12), which are at least partially surrounded by the connection element (10) configured as a cast part, so a positive connection of the rotor shaft (2) to the rotor cup (3) can be achieved.

Abstract: A supporting disk for providing bearing support to a rotor of an open-end spinning machine includes a hub ring (1) and a supporting ring (2) that surrounds the hub ring (1) at least partially with radial clearance. The hub ring (1) and the supporting ring (2) each are made of a polymer material, and the hub ring (1), at least on its outer peripheral surface (3), has a metal coating (5) which is located at least partially in the gap (4) formed by the clearance, and which contiguously adjoins the inner circumferential surface (6) of the supporting ring (2), and extends axially up to at least one of the end faces (7, 8) of the supporting disk.

Abstract: A method for producing an effect yarn on an open-end rotor spinning machine, formed from an alternating line-up of yarn sections and effects consisting of pre-determined thickenings, wherein an effect is produced where the yarn is joined by means of a piecing end, in the piecing region of the yarn located downstream of the piecing end, following a break in the thread. The quality of the yarn produced in this way is improved such that unwanted deviations from the pre-determined repeat of pattern of the effect yarn, caused by piecing regions, are eliminated.

Abstract: Driving system for open-end spinning machines, in particular of open-end spinning rotors, in which the power necessary for the driving of said rotors is distributed between two electric motors situated at the head and tail-end of the spinning machine, with a common belt transmission, the rotation of the tail-end motor being subordinate to the rotation of the motor at the head.

Abstract: A rotor spinning machine of the type comprising a plurality of working stations and a bobbin supplying device extending along the machine, wherein at least two service units supplying the working stations with bobbins are supplied by the supply device and wherein the rotor spinning machine comprises a control device for controlling the service units. The control device is configured in such a way that it suppresses a subsequent bobbin request from the second service unit in the event of an existing bobbin request from the first service unit positioned downstream in relation to the transporting direction of the supply device, until the initially existing bobbin request has been fulfilled.

Abstract: An exchangeable adapter is provided for reducing the size of a trash removal opening of an opening roller housing in open-end spinning arrangements. The said adapter comprises two semi-spherical supporting surfaces at a distance to one another for positioning the adapter on corresponding rounded countersurfaces. The adapter comprises further a curved fiber guiding surface corresponding to the curve of an opening roller as well as a boundary wall for reducing the size of the trash removal opening arranged directly upstream of the fiber guiding surface. The adapter is made from profiled bars and cut to the required effective width. The fiber guiding surface can be provided with a recess which is connected with the external atmosphere and which permits the entry of air into the opening roller housing.

Abstract: Driving system for open-end spinning machines, in particular of open-end spinning rotors, in which the power necessary for the driving of said rotors is distributed between two electric motors situated at the head and tail-end of the spinning machine, with a common belt transmission, the rotation of the tail-end motor being subordinate to the rotation of the motor at the head.

Abstract: A rotor cup for an open-end spinning device comprises a supporting base body which is provided with an insert. The insert comprises the fiber guiding surfaces, namely a fiber sliding surface and a fiber collecting groove. The insert is centered radially in the base body and is supported axially with a stopping face at the base body and crimped therein.

Abstract: A channel plate for an open-end rotor spinning device for closing a rotor housing charged with underpressure in which a spinning rotor rotates, having a channel plate tower extending into the spinning rotor, in whose shell face the outlet opening of a fiber guide channel is arranged and in whose front side a yarn draw-off nozzle can be fixed. A concavely arched transition surface adjoins a cylindrical part of the shell face, and the channel plate tower has a diameter at the height of the rotor edge of the spinning rotor such that an annular gap of maximally 2 mm width between the spinning rotor and the channel plate tower results during spinning. At most one half of the outlet opening of the fiber guide channel is arranged in the area of the cylindrical shell face, and the remaining part in the arched transition surface. The wall area of the outlet opening remotest from the front side is at a distance to the center longitudinal axis of the channel plate at least 0.

Abstract: A spinning machine drafting device includes a pressure roller loaded against a lower roller such that a fiber structure is conveyed between the roller pair. The pressure roller has an outer circumferential layer disposed around an inner circumferential layer of different low friction material as compared to the outer layer. The outer layer is thinner than the inner layer and disposed around the inner layer so as to slide relative to the inner layer upon rotation of the pressure roller in operation of the drafting device.

Abstract: An open-end spinning unit, which comprises a spinning rotor 1 that rotates during the spinning operation at a high rotational speed in a closed rotor housing 2. The spinning rotor is rotated by an individual electric motor drive 18 and supported in a smoothly running bearing assembly. When the drive is disconnected and the rotor housing is properly closed by a cover element 8, the spinning rotor is biased and rotated by an airflow resulting from a vacuum prevailing in the rotor housing and the motor drive operates as a generator. At least one of the electric quantities Pv, Gv which develop during the generator operation of the drive 18 is monitored, and upon exceeding a threshold value which can only be attained when the cover element is properly closed, a signal S is generated and processed in a control unit 30 to cause the cover element 8 on the rotor housing 2 to be locked, and thereafter the drive 18 is connected to its electrical supply to rotate the rotor at high speed.

Abstract: A yarn withdrawal device for open-end spinning arrangements has a yarn withdrawal nozzle and a balloon-breaking insert which extends the axial channel of the yarn withdrawal nozzle. The yarn withdrawal nozzle has a curved contact surface for deflecting a yarn to be withdrawn and simultaneously rotating the yarn in a crank-like manner, which contact surface graduates from a front surface into the axial channel. The balloon-breaking insert has an inner wall which is provided with raised areas and/or recesses, with which the yarn comes into contact. The contact surface of the yarn withdrawal nozzle is a smooth steel surface. The raised areas and/or the recesses of the balloon breaking insert are such that a yarn hairiness in the range of 3 mm in length is achievable. In addition, values in relation to the spinning stability, tear resistance and evenness can be achieved which are usual in the case of a notched contact surface of standard yarn withdrawal nozzles without a balloon-breaking insert.

Abstract: A channel plate adapter 24 is provided for an open-end spinning arrangement 1 having a spinning rotor 3 which turns at a high number of revolutions inside a rotor housing 2 chargable with an underpressure. The channel plate adapter 24 is made of a plastic material, defines the orifice area of a fiber guide conduit and a center through-bore 26 for a yarn withdrawal nozzle 27, and is adapted to be exchangeably arranged in a receiver 22 of a fiber channel plate 10 for closing the rotor housing during a spinning operation. The channel plate adapter (24) has a unitary one-piece clip-on closure (37) at inlet area of the through-bore (26) for centering and fixing the yarn withdrawal nozzle (27) in place.

Abstract: An open-end spinning device comprises a spinning rotor (21) rotating in a rotor housing with a spinning insert (24) supported rotatably with respect to the spinning rotor (21) coaxially to the rotor axis (33). The spinning insert (24) can be caused to rotate as a function of the rotary motion of the spinning rotor (21) via a contactless entrainment of the spinning insert (24) by means of permanent magnets (32) attached to the spinning insert (24). In this manner a simple and reliable entrainment and an automatic adjusting of the rotational speed of the spinning insert (24) in the spinning rotor (21) are achieved.

Abstract: An open-end spinning device has a spinning rotor (2) with a rotor groove (25) at its greatest inside diameter in which fibers are collected. A yarn shank (27) extending from a yarn withdrawal nozzle to the rotor groove (25) is curved in the vicinity of the rotor groove (25) counter to the direction of rotor rotation during the spinning process forming a lagging tie-up zone whereat yarn formation takes place. A rotor insert (18) is rotatably supported within the spinning rotor coaxially to the rotor axis. The rotor insert (18) can be caused to rotate in a contactless manner by the rotation of the spinning rotor. The rotor insert (18) comprises a yarn guide conduit (20) that receives the yarn shank (27) to effect a retardation of the rotor insert (18) during normal spinning operation, which significantly improves the stability of the spinning process over known open-end spinning devices.

Abstract: A conduit plate adapter for use with an open-end spinning device, comprising a base body having a central passage bore extending therethrough and a yarn withdrawal nozzle mouth fixedly secured directly in the central passage bore. The conduit plate adapter of the present invention is removably inserted into a conduit plate.

Abstract: A yarn withdrawal nozzle for an open-end rotor spinning arrangement, having an inlet funnel and a coaxially arranged structure in the inlet funnel, as well as notches arranged in a spaced-apart manner that are positioned in the traveling direction of a yarn downstream of the coaxially arranged structure. The coaxially arranged structure is comprised of circularly-shaped beads or grooves of different diameters.

Abstract: A spinning device comprising a spinning box housing; a spinning rotor having a spinning cup on a rotor shaft; a cover element; a traveling belt acting tangentially on the rotor shaft; a rotor brake; a pivotable expander roller moveable within a maximum pivot angle via a pressure lever system connected to the brake gear of the rotor brake between an operative position when the spinning box is closed in an inoperative position wherein the expander roller is automatically lifted off the tangential belt and the rotor brake is applied to the rotor shaft when the spinning box is opened; a brake and locking lever having a locking recess in contact with an arresting roller arranged on the cover element; and an arrangement in the pressure lever system for absorbing shock-like forces acting on the expander roller and for preventing the forces from being transmitted to the brake and locking lever.

Abstract: A rotor shaft of an open-end spinning rotor is provided with a peg-like shaft end having a reduced diameter. The shaft end has a front-end supporting surface which can be arranged to a step bearing, said supporting surface being provided with a wear-resistant insert. The reduced diameter of the peg-like shaft end is at least 0.68 times the diameter of the rotor shaft. In addition, the reduced diameter of the shaft end measures at least 0.82 times the length of the peg-like shaft end.

Abstract: A channel plate adapter 24 is provided for an open-end spinning arrangement 1 having a spinning rotor 3 which turns at a high number of revolutions inside a rotor housing 2 chargable with an underpressure. The channel plate adapter 24 is made of a plastic material, defines the orifice area of a fiber guide conduit and a center through-bore 26 for a yarn withdrawal nozzle 27, and is adapted to be exchangeably arranged in a receiver 22 of a fiber channel plate 10 for closing the rotor housing during a spinning operation. The channel plate adapter (24) has a unitary one-piece clip-on closure (37) at inlet area of the through-bore (26) for centering and fixing the yarn withdrawal nozzle (27) in place.

Abstract: A supporting disk for supporting a rotor, in particular the rotor on an open-end spinning rotor, having a hub ring and a supporting ring situated on the outer circumference of the hub ring, made of a polymer material, and having a running surface for the rotor, wherein the supporting ring (1) has at least one lip-shaped projection (7) on at least one of its axial end faces (6).

Abstract: The invention concerns a cleaning apparatus for the cleaning of a spin rotor of a spinning station with a cleaning head which can be insertably presented to the spin rotor and on which cleaning head are placed at least two scraper elements. In accord with the invention, the at least two scraper elements are pneumatically extendable, wherein the position of the at least two scraper elements are so secured on the outer circumference of the cleaning head, that the sum of the contact forces which are exerted from the scraper element in a radial direction onto the rotor is zero, or practically zero.

Abstract: It is the object of the invention to propose a method for open-end rotor spinning, wherein the formation of cover yarn, in particular the so-called “belly bands”, is at least appreciably reduced. In accordance with the invention, the fiber flow exiting a fiber guide channel has a directional component in the direction of rotation of the rotor, while the yarn leg (3) extending, from the draw-off nozzle to the rotor groove, is curved opposite the direction of rotation of the rotor, at least near the rotor groove (1), during the spinning process. The creation of this direction of curvature of the yarn leg (3) takes place during the piecing process.

Abstract: A hard, wear-resistant ceramic surface is applied to spinning rotor cups in an electrolytic bath on which is imposed a shaped-wave electric current. A special electrode has been designed to facilitate application of the coating to the unique shape of a spinning rotor cup under the shaped wave conditions.

Abstract: In open-end spinning and in coordination with predetermined operating phases, a yarn suction pipe by means of which a yarn extending from a bobbin is to be received temporarily is brought successively into different operating planes. The yarn suction pipe is imparted a defined operational movement as a function of the operating planes occupied and in coordination with the current operating phase. The operating positions of the yarn suction pipe that can be moved into at least two operating planes are defined in such a manner that when the yarn suction pipe is in its operating position in a first operating plane, a yarn extending from the bobbin pressing on a winding roller to the yarn suction pipe crosses the traversing range of the yarn traversing guide. However, the yarn is outside the traversing range of this yarn traversing guide when the yarn suction pipe assumes its operating position in an additional operating plane.

Abstract: The present invention concerns a procedure for the reworking of a open-end spinning apparatus for a spin rotor, which is carried in the V-notch between support disks and is supported by a ball axial thrust bearing. Where the reworking is concerned, the bearing block of the open-end spinning apparatus is dismounted, the ball axial thrust bearing is removed from the bearing block and in accord with the invention, is replaced by an aerostatic bearing in the bearing block.

Abstract: A conduit plate adapter for use with an open-end spinning device, comprising a base body having a central passage bore extending therethrough and a yarn withdrawal nozzle mouth fixedly secured directly in the central passage bore. The conduit plate adapter of the present invention is removably inserted into a conduit plate.

Abstract: A method of spinning-in yarn on an operating unit of a rotor spinning machine includes steps of yarn preparation for spinning-in, steps of spinning rotor preparation for spinning-in, and final spinning-in steps. The final spinning-in steps include at least the beginning of the sliver supply to the singling-out device, leading of the fibers from the singling-out device away from the spinning rotor for a predetermined time interval, letting the spinning-in yarn end get into contact with the collecting groove of the spinning rotor, and starting of the yarn draw-off and winding. At least some final spinning-in steps are time synchronized in relation to the closing of the spinning unit thus obtaining optimum piecer quality repeatedly at all operating units of the machine.

Abstract: The invention relates to a rotor spinning machine comprising a plurality of operating units situated next to each other, each of which contains a spinning unit (1) with a singling-out device (5) having in its body a rotatably mounted combing roller (52) equipped on its circumferential surface with an operative coating (521) around which there is provided in the body (51) of the singling-out device a circumferential fibre channel (511) whose operative section extends in the sense of rotation of the combing roller (52) from the mouth of the sliver feeding device (4) to the supply channel (6) bringing the singled-out fibres into the rotor, said circumferential fibre channel (511) having provided therein the mouth of a closable auxiliary supply channel (514) for pressure air.

Abstract: A supporting disk for supporting a rotor, in particular the rotor in open-end spinning rotors, having a hub ring and a supporting ring positioned on the outer circumference of the hub ring, having a bearing surface for the rotor, the outer circumference of the hub ring and the inner circumference of the supporting ring being connected to each other with form locking; the supporting ring (3), in cross-section, being formed from a running part (4) provided with bearing surface (10) for the rotor and at least two anchor legs (7, 8) extending from running part (4) and directed radially inwardly as well as axially outwardly.

Abstract: An arrangement for an open-end rotor spinning comprises a spinning rotor which is radially supported with a rotatable shaft in a wedge-shaped gap of two supporting disc pairs and axially in a step bearing housing. The shaft can be pulled out from its support from the operator's side of the arrangement and inserted again into the support. For the purpose of cleaning the gap between the back supporting disc pair and the front face side of the step bearing housing, a tube is provided having an entry opening at the operator's side of the arrangement and leading to the area of the step bearing housing and aligned against the shaft with an opening.

Abstract: A spinning rotor of an open-end spinning device is slowed down for piecing to a low rotational piecing speed and is then accelerated to the operating speed. For this purpose, the spinning rotor or an element in driving connection with it is presented a drive transmission device from a service unit by means of which the spinning rotor can be switched from normal production speed to a reduced piecing speed and back. In this process, the drive transmission device can be driven either by a driving apparatus installed on the service unit or by a drive belt extending within spinning machine. The driving apparatus mounted on the service unit is connected to a control device for the control of the evolution of the rotational speed of the spinning rotor. The spinning rotor is driven according to a rotational speed course controlled by means of a program applied by the control device during the time when its rotational speed deviates from its operating speed.

Abstract: The invention concerns exchangeable machine components (20, 30, 40, 50) of a spinning machine in a spinning works, upon each, in accord with the invention, a corresponding identification recognition symbol (21, 31, 41, 51) is placed, in such a manner that said symbol is in a location of simple accessibility for reading. By means of sensors (22, 32, 42, 52) the identification recognition symbol (21, 31, 41, 51) is automatically detectable, and stored so that the configuration of a spinning station can be immediately called up. The configuration data are thus available for a monitoring and service system, such as, for instance, a remote diagnostic system.

Abstract: An open-end rotor spinning machine having at least two identical work stations, wherein each work station comprises an open-end spinning device for producing a yarn, a winding device with a creel, a yarn cross-winding device for producing a cheese, a vacuum-chargeable, pivotably seated suction nozzle having a yarn catch element arranged thereon, a device for preparing a yarn for piecing, and a stationary yarn guide device wherein the stationary yarn guide device and the yarn catch element are cooperatively arranged for retrieving the yarn from the cheese and transferring the yarn to the open-end spinning device.

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: A process and apparatus are provided for the manufacture of a composite fibrous strand comprising glass fibers. Glass fibers and an additive fibrous material (e.g., thermoplastic polymeric fibers) are each introduced separately into a substantially rotationally symmetric zone that is closed circumferentially except for a longitudinal introduction locale. The glass fibers and the fibers of the additive fibrous material are subjected to a vortex to form a homogeneous composite fibrous strand. Good admixture of the fibrous components is made possible thereby facilitating the ultimate production of composite articles wherein the glass fibers are disposed as reinforcement in a highly uniform manner. Such homogeneity and uniformity provides improved mechanical properties to the end user.

Abstract: Proposed is a support disk base (1) and a support disk for the bearing of a rotor of an open-end spinning apparatus, whereby on the outer circumference of the support disk base (1) a support ring (8) can be installed by force-fit. In accord with the invention, provided on the outer circumference of the support disk base (1) are grooves (3, 4, 5, 6, 7) running in the axial direction. Upon the operation of the support disk with the base (1), the said grooves (3, 4, 5, 6, 7) increase the holding power of a later circumferentially installed support ring against centrifugal forces. Further, a procedure for the manufacture of the basic form of a support disk is provided.

Abstract: For cleaning of a spinning rotor independently of the support of the spinning rotor, a rotary drive (4) is selectively movable into and out of contact with an outer rotor surface via entraining elements (7) for imparting rotary movement to the spinning rotor (1). The entraining elements (7) are arranged such that radial forces produced by the contact are mutually cancelled. The entraining elements (7) are advantageously attached directly to the electric rotor (9) of the rotary drive (4).

Abstract: An open-end spinning apparatus has a spin rotor (1) which, by means of its shaft (11) is supported by support plates (4), wherein as an abutment for the axially directed force on the spin rotor (1), an aerostatic axial bearing (6) is provided. The bearing surface (115) of the spin rotor (1) operates together with a bearing plate (63) of the axial bearing (6). The bearing surface (115) or the bearing plate (63) are comprised of a construction material of polyimide. Advantageously, the polyimide is combined with an additive, namely graphite, for instance.

Abstract: A method of spinning-in yarn on an operating unit of a rotor spinning machine which comprises steps of yarn preparation for spinning-in, steps of spinning rotor preparation for spinning-in, and final spinning-in steps, the steps of yarn preparation for spinning in comprising at least the detection of the yarn end on the bobbin or the preparation of auxiliary yarn when spinning-in on an empty tube, unwinding and metering a yarn length required for spinning-in, setting the yarn into its spinning-in path on the operating unit of the rotor spinning machine in which the yarn is outside the reach of the yarn distributor and not clamped between the rollers of the draw-off mechanism, creating a spinning-in yarn end and introducing it into the yarn delivery tube from the spinning rotor, the steps of the spinning rotor preparation for the spinning-in comprising at least the opening of the spinning unit to its cleaning position, cleaning of the stopped spinning rotor, closing of the spinning unit, and the final spinning

Abstract: An open-end spinning frame (1) having a spinning rotor (3), whose rotor shaft (4) is supported, free of axial thrust, in the bearing wedge of a support disk bearing arrangement (5) and is fixed in place by means of a magnetic axial bearing (18). The axial bearing (18) has a stationary magnetic bearing component (27) fixed on the bearing housing (26), and a rotating magnetic bearing component (44) arranged at the end of the rotor shaft and having at least two annular shoulders (46) defined by recesses (47) in the rotor shaft (4). The sharpness of the annular shoulders (46) is reduced in the area between their outer circumference (58) and the adjoining radial faces (50) of each annular shoulder, e.g., via curved or beveled surfaces in such area, and the base surfaces (49) of the recesses (47) are each connected via rounded sections (51) with the radial faces (50) of the adjoining annular shoulders (46).