Abstract: An air jet aggregate for an air jet spinning apparatus for producing a spun thread from a staple fiber strand includes a vortex chamber and a number of fluid-feeding injector channels running into the vortex chamber. At least two injector channels are provided, which have differing angles of inclination in relation to a parallel to the axis of the spun thread. The at least two injector channels having differing angles of inclination are connectable to at least one pressurized air source. The injector channels with differing angles of inclination are, preferably, connectable to separately adjustable pressurized air sources.

Abstract: An air jet spinning machine for producing spun threads from staple fiber strands includes a number of spinning positions, to each of which compressed air nozzles are arranged for the purpose of generating the spinning twist. A joint compressed air regulator is connected upstream of the spinning positions, which regulator includes a pressure sensor and a regulating device. The compressed air regulator is set at a reference pressure, which corresponds to the unregulated static pressure prevailing when all spinning positions are in operation. In the case of a change in the static pressure, the compressed air regulator re-adjusts to the reference pressure.

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: 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: 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: So that stray fibers do not become attached to the rotor during a yam piecing process in the spinning box of a rotor spinning machine, the rotor may be cleaned by an air flow generated by drawing air into the rotor by the prevailing spinning vacuum or by blowing compressed air into the rotor through a closable opening in the rotor chamber. To avoid the danger that soiling of the closure of the opening will permit aspiration of secondary air and impair control of the air supply, the closure is formed as a slide member with a leading edge configured for cleaning the opening during closing movement.

Abstract: An open-end spinning rotor has a fiber collecting groove which is provided with fine roughenings. The fiber collecting groove includes additional profilings whose peak-to-valley height is at least five times the peak-to-valley height of the roughenings. This arrangement results in an improvement in yarn quality.

Abstract: An adaptor in the form of an exchangeable extension adapted to the dimensions of an open end spinning rotor and in use is detachably connected with a spinning rotor cover. The adaptor comprises the first part of a yarn withdrawal channel as well as the end area of a fiber feed channel. The end area of the fiber feed channel continues the connecting part of the fiber feed channel located outside of the adaptor with a partioning joint. The transition from the connecting piece to the end area of the fiber feed channel is buckle-free or bend free. The end area of the fiber feed channel located in the adaptor has a curved area, which is also buckle-free or bend free. This curved area corresponds to the rotational direction of the spinning rotor and also comprises a component in axial direction of the spinning rotor. The curved area preferably extends with a constant radius over the entire adaptor.

Abstract: An open-end spinning device has a spinning rotor defining a fiber collection groove between a rotor bottom and an open-end of the spinning rotor. The rotor further includes a wall extending from the fiber collection groove to the open end of generally less than 6.0 mm. A rotor cover has an extension reaching into the interior of the spinning rotor. The extension includes at least a portion of a fiber feeding channel for feeding a fiber and air mixture into the rotor. A feed surface is disposed essentially parallel to a plane through a fiber collection groove into the extension adjacent the fiber feeding channel so that fibers exiting the feeding channel are directed along the feed surface. The feed surface has a radial dimension so that an open radial distance of less than 4.0 mm exists between the feed surface and the wall or fiber collection groove which is directly radially opposite of the feed surface.

Abstract: In the case of a device for open-end rotor spinning with a spinning rotor, the spinning rotor is provided with a fiber collecting groove and a fiber sliding surface. The fiber sliding surface is provided with structured areas which are set in the opposite sense of rotation to the spinning rotor, viewed in the direction towards the fiber collecting groove. The mouth of a fiber feed duct is disposed facing the structured areas with a component in the sense of rotation of the spinning rotor. Due to the way they are arranged, the structured areas, which cross the path of the fibers, exert a propelling force on the fibers in the direction of the fiber collecting groove. The sliding of the fibers into the fiber collecting groove does not take place exclusively by means of the centrifugal forces anymore, so that in design the traditional angle of taper of the fiber sliding surface is not necessary.

Abstract: In the case of an open-end rotor spinning arrangement, in which the spinning rotor is arranged in a housing which is connected to a vacuum source, a fiber feeding duct is provided which extends from an opening roller to the area of a sliding surface which widens conically to form the fiber collecting surface of the spinning rotor. The smallest cross-section of the fiber feeding duct is situated at a distance from the mouth which is constructed as a slot, the height of which in the axial direction of the spinning rotor is much smaller than the ideal diameter of the smallest cross-section. The ideal diameter is defined as that diameter which corresponds to a circular area corresponding to the smallest cross-section.

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: To spin a yarn with an open-end rotor spinning device, the fibers are fed to a fiber guiding surface from which the fibers are deposited on the sliding wall of a spinning rotor after passing over a gap. At the same time, an air stream is guided through the gap into the interior of the spinning rotor and is then removed from the interior of the spinning rotor without passing through the gap again. To produce the air stream, a device for the production of a pressure drop which produces the air flow flowing into the interior of the spinning rotor is assigned to the gap (17).

Abstract: A rotor cover designed with a sealing surface interacting with a compressed-air connection, whereby the compressed-air connection is effected via a connecting piece located between the rotor cover and the appertaining mounting plate.

Abstract: In an arrangement for open-end rotor spinning having a fiber feeding duct leading from a feeding and opening device to a spinning rotor, it is provided that the fiber feeding duct, at a distance to its mouth, is provided with at least one bypass opening which has a smaller cross-section than the mouth of the fiber feeding duct and which is provided at a point of the fiber feeding duct which has a larger cross-section than the mouth.

Abstract: In an arrangement for open-end rotor spinning having an opening roller, a spinning rotor and a fiber feeding duct connecting the opening roller and the spinning rotor, it is provided that the fiber collecting groove has a diameter of maximally 33 mm, that the mouth of the fiber feeding duct amounts to maximally 20 mm.sup.2, that the fiber feeding duct, on the outside of the spinning rotor, is provided with a bypass opening, and in that the rotor is provided with ventilating bores.

Abstract: An open-end rotor spinning apparatus is provided which includes a spinning rotor element for spinning yarn. A yarn receiving surface is included with the spinning rotor element and is arranged around a spinning rotor element substantially circumferentially transverse to the axis through the spinning rotor element. A housing is provided for housing the spinning rotor element, and the housing element is connected to a vacuum source. A fiber feeding duct feeds fibers to the spinning rotor element. The fiber feeding duct includes a mouth area leading into the spinning rotor element and adjacent feeding duct. The mouth is oval shaped and has a cross-sectional width in the circumferential direction of the yarn receiving surface which is greater than the cross-sectional width in the axial direction of the spinning rotor element.

Abstract: The wall of the friction spinning element has bores or holes with a predeterminate bore diameter and a coating on their side facing a fiber feed duct, the coating extending over the bore edges into the bores. Each bore or hole thus formed has a diameter at the bore or hole entrance or inlet which is smaller than the bore diameter of the related bore or hole. Each bore or hole has a cross-sectional area of less than 0.283 mm.sup.2, but amounting to at least 0.07 mm.sup.2. In this way, the undesirable penetration of fibers or fiber parts into the bores or holes is prevented as far as possible when air flows through the bores or holes at the side of the coating, while retaining a hole form or configuration which is favorable from the standpoint of airflow and blockage of the bores or holes.

Abstract: An open-end rotor spinning apparatus is provided which includes a spinning rotor element for forming yarn including an open side. A cover element is provided for covering the open side of the spinning rotor element. A projection element is disposed at the cover element and projects into the side of the spinning rotor element. A fiber feeding duct is disposed in the projection element. A yarn withdrawal duct is also disposed in the projection element and provides a pathway for formed yarn being withdrawn from the spinning rotor element. A yarn withdrawal nozzle element projects from the yarn withdrawal duct element into the spinning rotor element open side. Holding elements are provided other than the yarn withdrawal duct element which hold the yarn withdrawal nozzle element on the projection element.

Abstract: In the manufacture of friction spinning drums, in order to be able to select the size of the holes or perforations, on the one hand, to oppose technological fiber loss and jamming of sucked in foreign particles and, on the other hand, to provide airflow advantages, it is proposed to manufacture the friction spinning drum from a thick-walled support and a thin-walled perforated body. As a result, holes or perforations having a sufficiently small cross-section to counteract the above-mentioned fiber loss can be formed in the thin-walled perforated body. On the other hand, holes or perforations having a large enough cross-section to prevent jamming of sucked in foreign particles or other contaminants can be provided in the thick-walled support.

Abstract: An open-end rotor spinning apparatus is provided which includes a spinning surface element. The spinning surface element is followed by a deflecting element having at least one false-twisting edge. A surface area is spaced opposite the deflecting element and includes a recessed area opposite the at least one false-twisting edge.

Abstract: In an open-end friction spinning process provisions are made for the fibers to be fed tangentially onto the surface of a hollow friction roller, at an angle to the longitudinal axis of said roller, whereby the fibers reach the spinning wedge in this position. In this manner, the fibers are arranged at a predetermined angle as they go from the fiber feeding channel to the spinning wedge and are brought into contact with the yarn end in this position which facilitates the joining process.

Abstract: The invention relates to an open-end rotor spinning unit and particularly solves the problem of the relationship between a fiber defining stud of a separator, a fiber supply duct and a yarn take-off duct passing through the separator and the stud.According to the invention, there is established a dimensional relationship of the defining stud to the mean staple length of fibers, and the orientation of the supply duct at an acute angle to the front wall of a cylindrical projection partially engaging into the spinning rotor.In inner section of the peripheral wall of the defining stud is curved in the direction of a natural fiber flow trajectory into the direction of the spinning rotor rotation while the outer section is either in contact with or radially set back from the cylindrical wall of the projection at a distance of up to 4 millimeters from the edge of the wall.

Abstract: The mask sleeve within the perforated roller of each spinning unit of a multi-position friction spinning apparatus is adjustable to move the suction slot of that roller between extreme positions in which an edge of the slot crosses from one side of the friction spinning nip to the other. Adjustment at each spinning unit is effected independently of the various other units of the machine by means of a rotary adjuster engaging a bifurcated end of a carrier which is itself adjustably fastened (by way of a clamp bolt) with respect to the masking cylinder. The adjuster and the carrier are outside the machine and allow adjustment of the positioning of the slot deep within the spinning unit for fine tuning purposes.

Abstract: An improved navel member positioned in the cover of the spinning rotor of an open-end spinning frame includes a barrel having a longitudinal passageway extending therethrough. The axis of the passageway is substantially coincident with the thread path as it exits the spinning rotor. A cylindrical insert is fixed in the barrel passageway and includes a longitudinal channel therethrough through which the thread actually passes. A plurality of spaced longitudinal grooves in the inside wall surrounding the longitudinal channel receive elongated ceramic rods partially embedded therein. The rods form a plurality of spaced obstructions around the periphery of the longitudinal channel. The periphery of yarn passing through the navel member intermittently engages and disengages the ceramic rods causing an improved roughening and bulking effect.

Abstract: The spinning device for open-end spinning contains a withdrawal nozzle with a substantially spiral-shaped bead or ridge as well as a twist blocking element or twist trap containing beads or ridges and provided in a thread withdrawal passage. The inclinations of the substantially spiral-shaped bead or ridge and of the beads or ridges in the withdrawal nozzle and in the withdrawal passage, respectively, substantially extend in the same direction or sense as the twist of the yarn. This device permits increasing the stability of the yarn, reducing the number of thread breakages and/or increasing the production rate. The yarn characteristics are less dependent upon the fiber material and the yarn type. In particular, the production of yarns with a soft handle is rendered possible at higher rotor speeds than heretofore possible.

Abstract: A fiber bundle produced by feeding combed fibers into a rotating rotor to accumulate the fibers over the inner circumference of the rotor is drawn out therefrom and is introduced into a false twisting unit, where the fiber bundle is false-twisted so that the twists are transmitted to a portion of the fiber bundle adjacent to the fibers accumulated over the inner surface of the rotor. A guide funnel having a guide surface extending near to the fiber accumulating surface is disposed within the rotor.

Abstract: The spinning device for open-end spinning comprises a withdrawal nozzle secured to a cover of a rotor housing for a spinning rotor and a nozzle body coacting with the withdrawal nozzle. The withdrawal nozzle and the nozzle body conjointly form a withdrawal passage or channel for the thread or the like produced by the spinning rotor. The cover is provided with a receiving socket which fixes the position of the nozzle body in radial direction, the nozzle body being inserted into the receiving socket. The nozzle body is pressed against the withdrawal nozzle by means of a manually-operable elastic device. The formation of the receiving socket permits insertion and removal of the nozzle body from the front side, that is from the service side of the spinning device. This provides the advantage of ready accessibility of the nozzle body and, in turn, thus affords easy replacement thereof. Replacement can be carried out without the use of tools.

Abstract: In order to be able to achieve, in yarn manufacture, the very high speeds required by the textile industry in open-end spinning devices, for the purpose of increasing production, and in order to achieve high operating reliability and a long life of the spinning devices, the rotor which rotates at high speeds and is subject to a variable imbalance and which is guided in gas-dynamic radial plain bearings is guided in a bearing carrier which is elastically pivotable in relation to the rigid bearing journal. At the same time, the bearing journal is connected, but so as to be elastically pivotable, to the bearing carrier via a bearing-body joint. A first gas-dynamic radial plain bearing, which is located in the region in the center of gravity of the rotor, is arranged on the bearing carrier, and a second gas-dynamic radial bearing is arranged at the opposite end of the bearing carrier.

Abstract: A fiber control apparatus in an open-end spinning frame is disclosed. According to the invention, in an open-end spinning unit having a fiber passage through which fibers opened by the combing roller are carried into the spinning chamber of the rotor, one or more nozzles are provided in the unit, each nozzle having an outlet opening located adjacent to the fiber outlet opening of the fiber passage so that one or more streams of jet air, emitted from the nozzle or nozzles, direct and guide the fibers introduced into the chamber toward the interior peripheral surface of the spinning chamber of the rotor, thus causing the fibers to reach said surface immediately without being slowed or bent by ambient air streams within the chamber. Consequently, formation of yarn having bent or randomly attached fibers is substantially prevented, whereby the strength and quality of the spun yarn is greatly improved.

Abstract: A single-step stable method of producing spun-twisted yarns. A twist point is located on the frictional surface of a take-off funnel of the spinning rotor. A strand material which forms a component of the final spun-twisted yarn product is exposed, between feed rollers and said twist point, to an appropriate combination of transport effects of a pneumatic field of force and a mechanical field of force. For this purpose, the tube, through which the strand material is supplied, is determined in dependence on the pneumatic conditions prevailing in the spinning rotor.

Abstract: A method of increasing the hairiness and bulkiness of a thread, in an open-end rotor spinning machine having a deflection ring disposed concentric to the axis of rotation of the rotor, includes forming a false twist in the thread with the deflection ring, continuously withdrawing the thread through the deflection ring substantially along the direction of the axis of rotation of the rotor, dissolving the false twist in the thread, forming a thread balloon with the thread, bringing the thread in contact with a multiplicity of separately disposed balloon disturbance elements, and changing the diameter of the thread balloon several times during each revolution of the thread balloon, and a device for carrying out the method.

Abstract: An open-end spinning unit is provided which has a spinning rotor open on one side and a bottom wall and an inner wall. A closing element covers the open side of the rotor and includes a fiber supply duct. To enhance the air conveyance of fibers to the inner wall, at least one suction opening is provided downstream of an outlet opening of the fiber supply duct in the closing element so that an airstream directed from the outlet opening toward the suction opening is generated in the same direction as the direction of rotation of the rotor. This invention is applicable not only to a forced-exhaustion type of unit but also to a self-exhaustion type of unit.

Abstract: A fiber control apparatus in an open end spinning frame, which is a spinning rotor provided with a structure capable of producing a rotary stream by which breaking or bending of fibers or formation of floating fibers in a spinning chamber of the rotor can be effectively controlled. This structure is mainly characterized by the arrangement of the exhaust vents formed in the spinning rotor.

Abstract: A rotor type open-end spinning unit in which in order to prevent blowing of air to the rear of an outlet of a fiber transporting channel formed in a spinning body and impingement of an air stream from the fiber transporting channel against the back face of a separator, the rear end of the outlet of the fiber transporting channel on the central side of a rotor is expanded forward of an imaginary line, connected between the rear end of the channel outlet furthest from the center of the rotor and the center of the rotor, and the angle .alpha. between the face of the fiber transporting channel confronting the combing roller and the plane intersecting the axis of the rotor at a right angle is made substantially equal to the taper angle .theta. of the back face of the separator.

Abstract: A method for manufacturing a thread, includes introducing fibers into a rotor having a fiber collecting groove, combining the fibers in the collecting groove into a fiber ring gradually converting into a thread, conducting the thread in a given travel direction through a pneumatic twisting device discharging a quantity of air, bringing the thread in contact with an air stream in the pneumatic twisting device which rotates around the longitudinal axis of the thread against the given travel direction of the thread, conducting fibers loosened from the thread back into the rotor with at least part of the quantity of air discharging from the pneumatic twisting device, drawing off the twisted thread leaving the pneumatic twisting device, and conducting the twisted thread to a thread collecting device, and a device for carrying out the method.

Abstract: A method and apparatus for spinning a modified fasciated yarn at a high production rate featuring a combination of open-end spinning and fasciated yarn spinning. A sliver is opened by a combing roller and deposited as a fiber layer on a fiber collecting surface of a drum rotor rotating at a high speed. Thereafter, the fiber layer is drawn off from the fiber collecting surface as a continuous fiber bundle by a central rotor rotating coaxially with the drum rotor at a faster speed. During the drawing-off operation, the fiber bundle is flattened to a ribbon form by making contact to a deflector and is subjected to a vortex within an air twisting nozzle mounted on the central rotor to form a resultant yarn. According to the present invention, high production rate can be obtained because a roller drafting system having aprons can be omitted.

Abstract: Improved yarn spinning-in process and apparatus in open-end rotor spinning units which raises the quality of the spun-in point in the yarn to a level comparable with the quality of the entire yarn length. The yarn open end is pieced on to high-quality fibers while low-grade fibers are separated from the high-quality fibers and do not participate in the spinning-in process.

Abstract: Apparatus for sealing a rotor housing of an open-end spinning machine is disclosed wherein the housing is under a reduced-pressure and includes a bore through which a rotor shaft of the spinning rotor extends. The apparatus includes a mounting carried by the rotor housing for floatingly mounting a sealing washer relative to the bore of the housing and a counter-surface carried adjacent the reduced-pressure side of the housing against which the sealing washer is abutted and maintained by the reduced pressure in the housing.