Abstract: A grinding device for the flats of a card comprises elastically bendable elements which enter between the clothing points, brush over the side flanks of the points and thereby grind the points. Additional grinding elements are provided in order to treat the front sides of the clothing points. The ground-off material may be removed by a suction device.

Abstract: The application relates to a device for air spinning, i.e., for the manufacture of a spun yarn from a sliver. The device contains in particular a fiber guide element, a fiber conveying channel, and an eddy chamber housing attached to the fiber guide element. The eddy chamber housing contains in its turn a spindle with a yarn guide channel arranged at a distance interval from the fiber guide element. In addition, the eddy chamber housing contains a fluid device with at least one jet nozzle for the production of an eddy current about an inlet aperture mouth of the yarn guide channel. The fiber conveying channel exhibits a tunnel cladding, which is dimensioned in such a way that at the end of the fiber conveying channel a step to the eddy chamber housing is formed.

Abstract: The hollow interior of an open-end spinning rotor is defined by an inner contour, which comprises a fiber sliding surface and a fiber collecting groove. The front surface of the open-end spinning rotor may have an opening width of between 19 and 23 mm, the fiber sliding surface may have a tapering of a maximum of 10°, and while the diameter of the fiber collecting groove may measure less than 30 mm.

Abstract: A double-apron drafting unit for spinning machines has a delivery roller pair and an apron pair arranged upstream therefrom. The apron pair guides a fiber strand in the area of a delivery nipping line, with which it forms a wedge-shaped gap. Devices are provided for keeping air currents, which circulate with the delivery roller pair, away from the area of the delivery nipping line, which devices are located outside of the wedge-shaped gap point formed by the delivery nipping line and the apron pair. The devices are, however, located in direct proximity to the delivery roller pair and the apron pair.

Abstract: An open-end spinning rotor has its thinnest wall thickness in the area of its fiber collecting groove. The lateral wall of the open-end spinning rotor comprises an outer contour, which—in axial section—is at least partly convex-shaped. The wall thickness of the lateral wall is increased along a portion of its length by a curved widening contour.

Abstract: In a texturing system with a texturing nozzle and a first drum (22) connected thereto and a further drum (23), a thread is guided on the outlet side of a texturing nozzle (10) at the circumference of a drum (22) in the form of a strip (1?) by friction and at least in part in positive manner, so that the longitudinal speed of the strip (1) at the circumference of the drum (22) corresponds with the circumferential speed of the drum in the area of the guide (220), whereby, by means of a pressure difference in an air guidance system, the effect is achieved by pressing the strip (1?) onto the surface of the drum (22). Further, the thread is guided in relation to its conveying speed and packing density, by positive and friction guidance under the imposition of air, as far as an outlet point on the first drum, and is transfered onto a second drum (23), on which the strip is cooled, extended if appropriate, and passed on to further guide or conveying rollers (22?) respectively.

Abstract: The hollow interior of an open-end spinning rotor is defined by an inner contour, which comprises a fiber sliding surface and a fiber collecting groove. The front surface of the open-end spinning rotor may have an opening width of between 19 and 23 mm, the fiber sliding surface may have a tapering of a maximum of 10°, and while the diameter of the fiber collecting groove may measure less than 30 mm.

Abstract: The invention relates to a method for changing the winding-off direction of reels (W,W1) which are delivered in succession by a delivery station (1) in order to form a reel group (WG) in which the front faces of adjacent reels (W) are equally spaced (a) and the longitudinal axes (LA) of the reels (W) are in a line. In practice, it is sometimes necessary to arrange the preparation machine for producing a reel (W) in such a way in relation to the combing machine group being used that the reels that are delivered by the preparation machine have a different winding-off direction in the ejected winding-off direction to that necessary for the subsequent combing machine. It is therefore necessary to rotate the reels (e.g. 90° or 180°) while preserving the division of the reel group.

Abstract: The invention concerns a start of spinning or the method of piecing for spinning positions of air spinning frames, which, during a spinning process, produce a thread from a longitudinal fiber structure and which, for this, comprise a fineness influencing unit with parts drivable at the inlet side and part drivable at the outlet side with clamping points, a means for the air twist generation and a means for the thread take-off, whereby, after an interruption of the spinning process, the resumption of the production of the thread comprises the following steps. In particular, the method does provide for,that the start-up of the part of the drafting unit, driven at the outlet side, takes place with a subsequent time coordinated and delayed start-up of the part driven at the inlet side, in such a manner that the end portions of the torn longitudinal fiber structure and of the thread end overlap and pass, in overlapping condition, the clamping point of the part driven at the outlet side.

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 process is disclosed for a spinning arrangement for dealing with the correction of an end break. During operation, sliver-like fiber material fed to the spinning arrangement is opened to single fibers by means of an opening roller. The single fibers are then transferred in the form of a fiber veil to a suctioned collecting surface, which is driven in the direction of motion of the single fibers. During the transport of the fibers by means of the collecting surface, the fiber veil is condensed to a narrow fiber strand and the condensed fiber strand is spun to a yarn downstream of a nipping line by means of a twisting nozzle. When an end-break occurs, the material feed is interrupted and the fiber strand is suctioned in the area of the nipping line until the collecting surface is free from single fibers. A piecing operation subsequently takes place.

Abstract: The invention relates to a device for the production of a spun thread from a staple fiber strand by means of air spin method. The fiber guiding element according to the invention includes a fiber conveying channel with a fiber guiding surface, whereby the fiber guiding surface ends at a fiber presenting edge and leads the fibers of the staple strand in the form of an essentially flat arrangement lying next to each other. The fiber-guiding surface is configured in such a manner that it includes a diverting point which causes a deviation of the staple fiber strand, where the deviation is being provided in such a manner that the free fiber ends of the fibers within the staple fiber protrude from the staple fiber strand.

Abstract: A combing ring for an opening roller of an open-end spinning arrangement is provided with at least two surface coatings, one applied on top of the other. Of these two coatings, the bottom one is a wear-resistant, harder PVD coating, while the upper one is a less hard, but fiber-friendly coating having a maximum thickness of 5 ?m, preferably a chemical nickel coating. The bottom PVD coating comprises in a known way so-called droplets, whereby the thickness of the top coating is at least equal to the height of the droplets.

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 flat end head with a mounting section for the flat rod and at least one sliding surface for progressive movement on a sliding guide of a card is made of a polymer material. The polymer material may be fiber-reinforced. Further, the polymer material may include a solid lubricant. The sliding guide may also be made of a polymer material. An apparatus for replacing a flat end head on a flat rod is also provided.

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 support for a combing means for an opening roller comprises an opening roller combing means, which is designed as a saw-toothed helix having multiple thread grooves. The number of threads amounts to approximately between one twentieth and one thirthieth (expressed in millimeters) of the outer diameter of the opening means. In addition, the angle of inclination (expressed in degrees) of the helix amounts to between 0.5 and 0.7 times the number of threads. The angle of inclination of the helix should not exceed 2.5°.

Abstract: The invention relates to textile machines with several spinning places, whereby each spinning place comprises a can feeding means (2), a spinning unit (3) and winding up unit (4). The invention is based on the task to design the spinning places in such a manner, to minimize downtimes due to failures of machine components or during re-fitting. According to the invention such a spinning place is furnished with modular structured and exchangeable spinning units (3) and/or winding up units (4).

Abstract: An apparatus for producing yarn spun from a loose fibre array using a vortex flow includes a fibre supply duct having an outlet opening. A vortex chamber in communication with the outlet opening is also provided. A yarn take-off duct is present with an inlet opening in communication with the vortex chamber. The vortex chamber is also in communication with an exhaust duct. A wall that defines at least a portion of the vortex chamber is present and has an opening disposed therethrough allowing for communication between the exhaust duct and the vortex chamber.

Abstract: An apparatus and method for producing a core spun yarn by means of a fluid delivery device is provided. The apparatus substantially comprises a fiber and thread guide means using a fiber guide conduit with a fiber guide surface for guiding fibers and a thread guide for guiding at least one continuous yarn into an inlet orifice of a yarn guide conduit and a fluid delivery device for producing a swirl flow about the inlet orifice of the yarn guide conduit so that the at least one continuous yarn can be spun over by the fibers. The thread guide is either a groove which is associated with the fiber guide surface, a bore disposed below the fiber guide surface, an individual tube-like element, or a tube-like element that is combined with a groove or a bore. The thread guide is introduced in a fiber and thread guide means, with the axis of the groove, the bore or the tube-like element being in alignment with the axis of the yarn guide conduit.