Abstract: A thread draw-off nozzle for an open-end rotor spinning device includes an entrance-side nozzle funnel and an exit-side nozzle bore adjoining the nozzle funnel. A plurality of notches are arranged in the nozzle funnel and extend essentially radial to the nozzle bore. Each notch has an inlet wall, a baffle wall, a radially outer notch inlet, and a radially inner notch outlet. Each notch further includes an essentially flat notch bottom arranged between the inlet wall and the baffle wall.

Abstract: A thread draw-off nozzle for an open-end rotor spinning device includes a front surface, a nozzle bore, and a funnel-shaped yarn deflection surface connecting the front surface and the nozzle bore. The front surface adjoins the yarn deflection surface. The front surface and the yarn deflection surface form an effective diameter (DW) of the thread draw-off nozzle. The effective diameter (DW) of the thread draw-off nozzle is less than 8 mm, and the yarn deflection surface comprises a radius of curvature (R) of less than 2.5 mm.

Abstract: A thread draw-off nozzle (1) for an open-end spinning device has a draw-off nozzle funnel (6) that contains a yarn deflection zone (3) for deflecting a yarn (5) produced during the yarn draw-off process. The draw-off nozzle funnel (6) has a two-part design, an external part (6a) containing a first area (3a) of the yarn deflection zone (3) and an internal part (6b) containing a second area (3b) of the yarn deflection zone (3). Both parts (6a, 6b) are made of different materials and/or have different coatings at least in the areas (3a, 3b) of the yarn deflection zone (3) or only one of the two parts (6a, 6b) has a coating.

Abstract: An open-end spinning system characterized by laying straightened fibers next to each other onto an endless member and moving these deposited fibers in a generally perpendicular direction to the fiber orientation into a twisting zone where they are twisted and compacted into a yarn.

Abstract: Yarn draw-off device for a textile machine producing cross-wound bobbins with a yarn draw-off roller that can be driven by a single motor and an associated pressure roller which is driven via frictional engagement, characterised in that the yarn draw-off roller (10) has a rotationally symmetrical basic member (15) with devices (33), which, during the rotation of the yarn draw-off roller (10) produce an air flow which cools the yarn draw-off roller drive (13).

Abstract: Yarn draw-off device for a textile machine producing cross-wound bobbins with a yarn draw-off roller that can be driven by a single motor and an associated pressure roller which is driven via frictional engagement, characterised in that the yarn draw-off roller (10) has a rotationally symmetrical basic member (15) with devices (33), which, during the rotation of the yarn draw-off roller (10) produce an air flow which cools the yarn draw-off roller drive (13).

Abstract: Described is a method for dissolving PPTA or copolymers thereof in sulfuric acid using a twin screw extruder having transporting, mixing, and kneading elements with an entering zone, an intermediate zone, a mixing zone, a negative transport zone, a degassing zone, and a pressure build-up zone.

Abstract: The invention relates to a receiving element for receiving an interchangeable yarn drawing nozzle that can be magnetically locked. According to the invention, the receiving element is configured as an adapter (26), which can be screwed into a central threaded bore (37) of a thread channel plate (12) in an open-ended rotor spinning device (1), the latter being designed to receive a conventional yarn drawing nozzle that is equipped with an external thread. The adapter (26) comprises centring bores (27) for receiving ferromagnetic centring lugs (28) of a yarn drawing nozzle (13) in addition to a continuous bore (33), whose internal diameter (d) is adapter to the external diameter (D) of the shaft (39) of the yarn drawing nozzle (13). The adapter is also equipped with permanent magnetic pins (30), which correspond with the ferromagnetic centring lugs (28) of the yarn drawing nozzle (13).

Abstract: A yarn withdrawal nozzle for an open-end rotor spinning arrangement is provided which includes a spiral-shaped surface in the yarn deflecting area which extends essentially over the entire yarn deflecting area and designed as a continuous spiral without interruptions. In addition thereto, the nozzle throat of the yarn withdrawal nozzle includes a further surface with structure downstream of the spiral-shaped surface, including rounded notches or curved humps. Both the spiral-shaped surface and the downstream structure are so designed that they are capable of transferring forces to the yarn without damaging same. The yarn withdrawal nozzle is moulded with a mould separation provided in an area downstream of the nozzle throat to facilitate assembly.

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 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: 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: 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: 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: 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.

Abstract: An Apparatus is described for the propagation of the rotary twisting of an open-end yarn from a yarn section in a thread guide to the entwinement point of an open-end spinning apparatus with a spinning element. A provision is made in the longitudinal extent of the thread guide for a thread contact surface, to which surface a vibration element is supplied. The thread contact surface possesses a polished surface and is part of an inlet element on the thread inlet end of the thread guide. The vibration element is connected to a control system, with the aid of which the frequency and/or the amplitude of the vibration generated by the vibration element can be made to match the current operational phase.

Abstract: For the formation of a thread withdrawal nozzle for an open-end spinning apparatus which possesses a spin rotor, a thread contact surface (32) of the nozzle is provided with projections (36), which projections close at an obtuse angle (&agr;) with the thread contact surface (32). Thereby, a satisfactory twist propagation is obtained to the fiber entwinement point, so that, in this manner, a softer thread can be produced. Advantageously, the thread is not roughened by this treatment.

Abstract: A draw-off nozzle in an open-end spinning machine is provided with grabbing notches, each of which has an entry wall on the entry side that is less steeply inclined than an impingement wall on the other side of the root of the notch. The notch wall can be straight, concave or convex, and preferably has a tangential transition to the lead-in wall, with an angle between the impingement wall and the perpendicular of between ten and thirty degrees and an angle between the entry-side wall of the notch and the perpendicular of between fifty and sixty degrees. Preferably an odd number of grabbing notches, with a notch positioning angle of thirty degrees to the perpendicular, are provided, uniformly disposed around the circumference of the lead-in funnel. The notch root itself may also be given a convex configuration.

Abstract: The invention concerns a thread guide tube with a passage for the guidance of a thread exiting the thread forming zone of a spinning machine. The tube possessing a first section which is proximal to the thread forming zone, and a second section which is remote from the thread forming zone. The thread guide tube has a separation so that the thread guide tube is separable and is comprised of at least two parts.

Abstract: A spinning rotor for open-end spinning machines and a method for balancing the spinning rotor in the course of a single clamping process by removing material from a cylindrical-shaped section of the collar (20) of the rotor cup (19) to form an identification mark (21) thereon sufficiently to offset an imbalance and equalize the mass of the rotor. The mark (21), which preferably consists of a combination of a graphic symbol (22) and lettering (23), is used for identification and information.

Abstract: For the propagation of the rotary twisting from a thread section (Gb) in a thread guide (2) into the entwinement point (E) of an open-end spinning apparatus with a spinning element (10) provision is made in the longitudinal extent of the thread guide (2) for a a thread contact surface (41), to which surface a vibration element (40, 40a, 40b, 40c, 40d) is supplied. The thread contact surface (41) possesses a polished surface and is part of an inlet element (21) on the thread inlet end of the thread guide (2). The vibration element (40, 40a, 40b, 40c, 40d) is connected to a control system (5), with the aid of which the frequency and/or the amplitude of the vibration generated by the vibration element (40, 40a, 40b, 40c, 40d) can be made to match the current operational phase and/or the current rotational speed of the spinning element (10) and/or the fiber material to be worked.

Abstract: In the case of an apparatus for open-end spinning, a fiber feed channel is arranged between an opening roller and a spinning rotor, which fiber feed channel tapers in a transport direction and which comprises a deflecting zone on its transport path. Immediately after the beginning of the deflecting zone, a bypass opening is provided, through which opening a part of the suction airflow transporting the fibers to the spinning rotor is drawn off. In the area of the opening roller, a bypass air inlet opening is provided additionally to support the suction airflow.

Abstract: A yarn withdrawal nozzle for an open-end rotor spinning apparatus comprises a short, funnel-shaped yarn deflecting surface, which begins at a plane front surface and graduates into a yarn withdrawal channel. The radius of curvature of the yarn deflecting surface measures a maximum of 3 mm. The front surface is formed as a tangential surface to the yarn deflecting surface, The small radius of curvature facilitates in particular the spinning of polyester yarns at a high rotor speed.

Abstract: An open-end spinning arrangement having a yarn withdrawal nozzle (10), by means of which the yarn is withdrawn form its transition zone within the spinning rotor and is rollingly and slidingly deflected while circulating in contact with the yarn withdrawal nozzle, additionally imparting a false twist. The yarn withdrawal nozzle has a depression (24), which is abruptly offset in the circulating direction of the yarn, by which the yarn loses contact with the yarn withdrawal nozzle (10) in the withdrawal direction of the yarn and over an angular area a of at least 10 degrees. Each time the rotating yarn tail sweeps over this depression, the false twist is completely interrupted and the actual twisting of the yarn at the yarn withdrawal nozzle (10) is cancelled.

Abstract: An open-end spinning device (1) with a forwardly-opening vacuum-loaded rotor housing (2), a high speed spinning rotor (3) rotating in the rotor housing and with a fiber conduit plate (4) for closing the rotor housing. The fiber conduit plate (4) has a replaceable conduit-plate adapter (10) forming the mouth area of a fiber guide conduit and a yarn withdrawal jet. The conduit plate adapter (10) is detachably fixed in a receptacle (7) of the fiber conduit plate (4) only in a frictionally connected manner by means of a magnetic coupling (15) which can be easily and rapidly detached when necessary yet is reliable and exact during operation and assembly.

Abstract: The present invention concerns a process and an apparatus, in particular a rotor cover (3) and a thread withdrawal tube (2), of an open-end spinning machine, for the pneumatic cleaning of the thread withdrawal tube (2) which has an irregular inner contour. In this arrangement, there opens into the zone of the irregular contour (24, 220) of the thread withdrawal tube (2) an air feed tube (6, 60) directed against the irregular interior contour (24, 200) into the inner space (25) of the thread withdrawal rube (2), through which a flow of air is conducted against the irregular inner contour (24, 220) of the thread withdrawal tube (2). The irregular inner contour (24) of the thread withdrawal tube (2) is formed by means of a disassembly point between two thread guiding elements (20, 21, 22, 23) arranged in sequence, the elements making up the complete thread withdrawal tube (2) or a twist element (220).

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 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 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: An adaptor is provided for an open-end rotor spinning arrangement, which adaptor is exchangeably arranged on a cover element of a spinning rotor and projects partly into the inside of the spinning rotor. The adaptor comprises the first section of a yarn withdrawal channel, as well as the end section of a fiber feed channel. On its side facing away from the spinning rotor, the adaptor has a bearing surface in the form of a plane ring surface, which by means of an axially effective fixing device is drawn against a take-up surface of the cover element. The circumferential surface of the adaptor is in the form of a cylindrical surface. A centering element, for fixing the adaptor on the take-up surface at an exact angle, is arranged at the fixing device, which centering element is disposed, in relation to the yarn withdrawal channel, almost diametrically opposite to the fixing device.

Abstract: An open-end spinning device with a forwardly open suctioned rotor housing, a high speed spinning rotor rotatably disposed in the rotor housing, and a fiber conduit plate for closing the forward opening in the rotor housing. The fiber conduit plate has an interchangeably disposed conduit plate adapter defining an opening from a fiber guide conduit into the rotor and a yarn take-off nozzle. The conduit plate adapter can be releasably fixed securely in place in a receptacle area of the fiber conduit plate by means of a central fastening arrangement comprising a threaded connection and a magnetic coupling between the fiber conduit plate and the conduit plate adapter.

Abstract: An inner rotor 5 has a recess 7 formed at a position corresponding to a navel 6 and the recess 7 has a taper surface 7a formed to the peripheral edge thereof. The end surface 6c of the navel 6 can be moved together with a support member 12 to an ordinary spinning position where it can be engaged with a thread Y drawn out through a thread guide and to a thread piecing position where it cannot be engaged therewith. When the thread is pieced, the navel 6 is disposed at the thread piecing position and after a seed thread is introduced into an outer rotor 2 from a thread drawing-out path 6b in the state that both the rotors 2, 5 are rotated, a fiber bundle in a fiber collecting portion 2a is drawn out together with the seed thread and a thread is spun without passing through the thread guide. Thereafter, the navel 6 is moved to the ordinary spinning position.

Abstract: A rotor type open-end spinning machine of a structure in which fibers moving slidingly on an inner wall surface of an outer rotor (2) are prevented from falling at a location where a fiber bundle is being stripped off from a fiber collecting/bundling section (7) while being twisted concurrently. An inner rotor (5) is disposed within the outer rotor (2) and positively driven independently of the latter. A delivery passage (20) is formed in the inner rotor (5) for guiding a fiber bundle (F) bundled in a fiber collecting/bundling groove (7) to a yarn withdrawing passage (14). An annular negative-pressure chamber (6) is formed radially outward of the fiber collecting/bundling groove (7) of the outer rotor (2) with air discharge holes (9) being provided for communicating the negative-pressure chamber (6) to the exterior of the outer rotor (2).

Abstract: Disclosed is a method for the coating of textile spinning machinery parts with a composite coating bearing finely divided lubricating particles dispersed within a hard metallic matrix. The lubricating particles are particulate matter capable of withstanding heat-treatment temperatures of at least 300.degree. C. without their degradation.

Abstract: A yarn being spun in a spinning station of a spinning machine is drawn off with an apparatus which includes a pair of rollers for clamping the spun yarn in a gap between the rollers and transporting the spun yarn. The rollers include a draw-off roller being driven continuously in a draw-off direction at a given circumferential speed and a switchable feed roller for contacting the draw-off roller and for being driven through friction by the draw-off roller when contacting the draw-off roller. A method for drawing off the spun yarn includes positioning the yarn to be drawn off between the rollers while the feed roller is not contacting the draw-off roller. The feed roller is driven with a fluid in a circumferential direction and accelerated to a circumferential speed being at most the given circumferential speed. The feed roller is then placed in contact with the draw-off roller.

Abstract: At least one circular ridge, which projects upwardly beyond the surface of the navel of the thread delivery device, is placed in the path of yarn being removed from the peripheral wall of the spinning chamber and delivered to the throat of the navel. The ridge has a height of at least 0.003" and is radially so located in proximity to the edge of the navel that the yarn being formed and lifted from the wall of the spinning chamber first engages the navel at the ridge.

Abstract: An open-end rotor spinning machine includes open-end spinning apparatuses each having a rotor housing, a spinning rotor revolving at high rpm in the rotor housing, and a yarn draw-off device extending into the spinning rotor. A cooling device includes a channel plate closing the rotor housing in an operating state. The channel plate has double walls defining a cooling chamber therebetween surrounding the yarn draw-off device. Connection sleeves connect the cooling chamber to a coolant loop.

Abstract: A spinning rotor for an open-end spinning device is proposed which is provided with a smooth surface at the critical locations in order to avoid deposits within the spinning rotor at its inner surface. The ring-shaped zone of the inner surface of the spinning rotor near its edge as well as the area of its bottom may for instance be made especially smooth by polishing.

Abstract: A yarn withdrawal navel for an open-end spinning apparatus is provided with a ferromagnetic locating surface. This is used for the purpose of coupling to a mounting, which has at least one permanent magnet. The yarn withdrawal navel and the mounting have abutment surfaces which are configured to vary the magnetic mounting effect on the navel as a function of the relative rotation position of the navel and the mounting.

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: An open-end spinning apparatus includes a rotor housing. A spinning rotor revolves in the rotor housing. A spinning insert is disposed coaxially to the rotor housing and is rotatably supported relative to the spinning rotor. The spinning insert has a yarn guide channel enabling entrainment of the spinning insert by a yarn during normal spinning operation. A coupling device fixes the spinning insert to the spinning rotor during a run-up of the rotor.

Abstract: In a method and device for manufacturing a twisted yarn a spindle rotor having a hollow spindle axle with inlet and outlet and a yarn guide channel extending radially outwardly from the outlet is provided. The yarn exiting the yarn guide channel forms a yarn balloon. A stream of dissolved fiber material is fed axially through the spindle rotor into the space delimited by the yarn balloon and is divided into two partial streams. Each partial stream is guided first radially outwardly, then upwardly substantially parallel to the hollow spindle axle to a predetermined level, and subsequently radially inwardly to a respective spinning device arranged within the space delimited by the yarn balloon. A fiber is spun in each of the spinning devices, withdrawn, and guided axially downwardly. The fibers together are fed into the inlet of the hollow spindle axle to form a yarn. The yarn is guided through the hollow spindle axle and the yarn guide channel from where it exits and forms the yarn balloon.

Abstract: In a method of manufacturing a twisted yarn a rotor is rotatably supported on a machine frame. A yarn guide channel extends radially within the rotor over at least a portion of its diameter. A centering eye for the twisted yarn is positioned on the extension of the rotor axis. A yarn guide tube is arranged so as to guide a yarn exiting from the yarn guide channel to the centering eye. A spinning device is rotatably supported on the rotor eccentrically relative to the rotor axis. A fiber strand is dissolved into dissolved fiber material and fed axially through the rotor and upwardly toward the spinning device where at least two spun fibers are produced. The spun fibers are downwardly guided toward the yarn guide channel so as to form a plied yarn. Along this path the spun fibers are subjected to a first twist to form a once twisted yarn by the rotation of the spinning device relative to the rotor.

Abstract: At least one circular ridge, which projects upwardly beyond the surface of the navel of the thread delivery device, is placed in the path of yarn being removed from the peripheral wall of the spinning chamber and delivered to the throat of the navel. The ridge has a height of at least. 003" and is radially so located in proximity to the edge of the navel that the yarn being formed and lifted from the wall of the spinning chamber first engages the navel at the ridge. The result of the engagement of the yarn with the ridge is that the twist is reduced and a higher break strength is achieved with a reduction in imperfections.

Abstract: At least one circular ridge, which projects upwardly beyond the surface of the navel of the thread delivery device, is placed in the path of yarn being removed from the peripheral wall of the spinning chamber and delivered to the throat of the navel. The ridge has a height of at least 0.003" and is radially so located in proximity to the edge of the navel that the yarn being formed and lifted from the wall of the spinning chamber first engages the navel at the ridge. The result of the engagement of the yarn with the ridge is that the twist is reduced and a higher break strength is achieved with a reduction in imperfections.