Abstract: A twin unit has two drafting devices for drafting fiber strands and is applicable in a spinning machine. The twin unit includes a common housing for the two drivable drafting devices, whereby the housing is detachably mounted in a machine frame. The drafting devices include a number of drivable bottom rollers and are arranged essentially mirror-symmetrical to one another. Each bottom roller has an area which drafts the fiber strand and is characterized in that the bottom roller has two bearing points. The two bearing points of each bottom roller are arranged one on either side of the area which drafts the fiber strand. In one variation, at least two opposite bottom rollers may form a bottom roller pair, in which the bearing points facing to the plane of symmetry of the twin unit are taken up in a joint bearing take-up. In addition, a top roller in the form of a twin pressure roller may be assigned to a bottom roller pair.

Abstract: An arrangement for producing a spun thread from a staple sliver including a drafting unit and an air jet aggregate arranged downstream thereof. A vortex chamber with an air evacuation channel is located in the air jet aggregate. A cleaning channel is arranged to the delivery roller pair of the drafting unit, which cleaning channel is connected, together with the air evacuation channel to a joint vacuum source. The cleaning channel runs preferably into the air evacuation channel in the inside of the air jet aggregate. The cleaning channel is preferably aligned against the pressure roller of the delivery roller pair. Further suction openings can be additionally arranged to the bottom rollers of the drafting unit, which suction openings are also connected to the joint vacuum source.

Abstract: A spindle-shaped component for an air jet spinning arrangement is described. The component includes a base body and an attached tip, as well as a yarn withdrawal channel which extends through the base body and the tip, the first part of the yarn withdrawal channel being an entry opening in the tip. The spindle-shaped component also has an injection channel which runs into the yarn withdrawal channel, the injection channel being directed in the direction of the entry opening of the yarn withdrawal channel. The injection channel is formed by a surface area of the base body and a surface area of the tip.

Abstract: A process and an arrangement for re-starting a previously interrupted spinning process in a spinning arrangement is provided. The arrangement includes a drafting unit which can be shut down and also an airjet unit including a vacuum chamber. For the purpose of removing an initially inhomogeneous fiber stream, a staple fiber strand, delivered by the re-operating drafting unit, is temporarily suctioned as waste via a deflecting device after it has left the drafting unit. Only then, when a homogeneous fiber stream has formed, is the staple fiber strand joined with a thread which is transported through the airjet unit. The inhomogeneous fiber stream is removed with the aid of the low pressure in the vacuum chamber.

Abstract: An airjet spinning arrangement includes a fiber feed channel and a thread withdrawal channel arranged downstream therefrom, which thread withdrawal channel is movable away from the fiber feed channel. An injector channel runs into the thread withdrawal channel, which injector channel is connectable to a compressed air source. The injector channel is arranged in a piston-like component, which piston-like component is movable away from the fiber feed channel by the compressed air fed to the injector channel.

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

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: An arrangement for producing a spun thread comprises a drafting unit having a delivery roller pair and an airjet assembly arranged downstream thereof. In the latter, a vortex chamber with an air evacuation channel is provided. Furthermore, at least one cleaning channel is provided, which is arranged with a suction opening to the delivery roller pair. This cleaning channel is connected by means of a mouthpiece to the air evacuation channel. Furthermore a compressed air opening of an injector channel is located in the area of the mouthpiece, said injector channel increasing the low pressure of the air evacuation channel when required.

Abstract: A supporting disc for a supporting disc bearing of open-end spinning rotors has a disc-like base body, on whose outer circumference a tire-like covering is applied. On a front side of the supporting disc facing the operator's side of the spinning aggregate, a cylinder-shaped permanent magnet for non-contact speed monitoring is arranged at a distance from the axis of the supporting disc. For the purpose of the correction of mass imbalances, the permanent magnet is inserted into a through bore hole, which is filled out by the permanent magnet only up to a gradation of diameters which serves as a stopping surface. As the permanent magnet is arranged in the transition area between the base body and the tire-like covering, the part of the through bore hole not filled out by the permanent magnet can be filled out by the covering.

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: An exchangeable reinforcing element for pressure rollers of drafting units of spinning machines. The reinforcing element comprises a thin reinforcing tube and a flexible roller covering securely affixed thereto which can be slid onto the pressure roller base body. The reinforcing element is cut from a long tube body to the required effective width. The roller covering is turned down at both ends in such a way that the reinforcing tube projects laterally over the roller covering.

Abstract: A twin unit has two drafting devices for drafting fiber strands and is applicable in a spinning machine. The twin unit includes a common housing for the two drivable drafting devices, whereby the housing is detachably mounted in a machine frame. The drafting devices include a number of drivable bottom rollers and are arranged essentially mirror-symmetrical to one another. Each bottom roller has an area which drafts the fiber strand and is characterized in that the bottom roller has two bearing points. The two bearing points of each bottom roller are arranged one on either side of the area which drafts the fiber strand. In one variation, at least two opposite bottom rollers may form a bottom roller pair, in which the bearing points facing to the plane of symmetry of the twin unit are taken up in a joint bearing take-up. In addition, a top roller in the form of a twin pressure roller may be assigned to a bottom roller pair.

Abstract: A holding device for a twin pressure roller of a drafting unit includes a number of bottom rollers. The twin pressure roller includes a stationary axle and two rotatably supported upper rollers. The holding device includes at least one positioning element assigned to the axle of the twin pressure roller and at least one force transmission element, wherein the positioning element is arranged in the area of the center of the axle of the twin pressure roller and thus permits the twin pressure roller to move in a pendulum fashion around the center. The holding device, together with the twin pressure roller may be lifted from the bottom roller. At least one catch bearing for approximate positioning during placement on the bottom rollers is assigned to the twin pressure roller. It may further be provided that the force transmission element is arranged separately from the positioning element and that the catch bearing is integrated into the force transmission element.

Abstract: An arrangement for producing a spun thread from a staple fiber strand includes a drafting unit and an airjet unit arranged downstream thereof. A vortex chamber including an air evacuation channel is located in the airjet unit. A cleaning channel having a suction opening is arranged to the delivery roller pair of the drafting unit. The air evacuation channel is designed, at least in its primary section, as a ring channel around a stationary spindle-shaped component. The cleaning channel merges with the air evacuation channel, preferably in the inside of the airjet unit, and both are jointly connected to a common vacuum source. The cleaning channel only merges with the air evacuation channel downstream of the ring channel in airstream direction. The cleaning channel can also include a ring-shaped area, which is arranged around the spindle-shaped component.

Abstract: In a texturing system with a texturing nozzle and a first drum connected thereto and a further drum, a thread is guided on the outlet side of a texturing nozzle at the circumference of a drum in the form of a strip by friction and at least in part in positive manner, so that the longitudinal speed of the strip at the circumference of the drum corresponds with the circumferential speed of the drum in the area of the guide, whereby, by means of a pressure difference in an air guidance system, the effect is achieved by pressing the strip onto the surface of the drum. 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 transferred onto a second drum, on which the strip is cooled, extended if appropriate, and passed on to further guide or conveying rollers, respectively.

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: An arrangement for producing a spun thread from a staple sliver including a drafting unit and an air jet aggregate arranged downstream thereof. A vortex chamber with an air evacuation channel is located in the air jet aggregate. A cleaning channel is arranged to the delivery roller pair of the drafting unit, which cleaning channel is connected, together with the air evacuation channel to a joint vacuum source. The cleaning channel runs preferably into the air evacuation channel in the inside of the air jet aggregate. The cleaning channel is preferably aligned against the pressure roller of the delivery roller pair. Further suction openings can be additionally arranged to the bottom rollers of the drafting unit, which suction openings are also connected to the joint vacuum source.

Abstract: An arrangement for manufacturing a spun thread from a staple fiber mass includes a feed channel having an outlet opening for feeding the fiber mass, and a yarn withdrawal channel having an inlet opening. In order to generate a rotating current around the entry opening of the yarn withdrawal channel, a vortex chamber is provided with compressed air nozzles. An air evacuation duct surrounds, essentially ring-like, a stationary, spindle-shaped component which forms the yarn withdrawal channel. The feed channel extends in a meandering manner and includes fiber guiding surfaces, which are designed in the form of deflecting edges, between which the staple fiber mass is without support.

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 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.