Abstract: A MEMS device comprising a flexible membrane that is free to move in response to pressure differences generated by sound waves. A first electrode mechanically coupled to the flexible membrane, and together form a first capacitive plate. A second electrode mechanically coupled to a generally rigid structural layer or back-plate, which together form a second capacitive plate. A back-volume is provided below the membrane. A first cavity located directly below the membrane. Interposed between the first and second electrodes is a second cavity. A plurality of bleed holes connected the first cavity and the second cavity. Acoustic holes are arranged in the back-plate so as to allow free movement of air molecules, such that the sound waves can enter the second cavity. The first and second cavities in association with the back-volume allow the membrane to move in response to the sound waves entering via the acoustic holes in the back-plate.

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: 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: 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 exchangeable insert is proposed as auxiliary equipment for a housing of a disintegrating apparatus of an open-end spinning apparatus. The insert is adaptable, so that the disintegrator roll housing can be made to conform to various spinning conditions. In a partial zone, in accord with this proposition, the insert replaces a circumferential wall of the disintegrator roll housing, wherein the insert extends itself into to a zone of a contamination separation opening of the disintegrator roll housing. Its extension in the axial direction is so chosen, that it, at least partially, forms a portion of the circumferential wall of the disintegrator in the area of the contamination separation opening.

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.

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: A spinning rotor for an open-end spinning frame has a coating of a non-ferrous metal with hard material granules embedded therein, which is applied to the surface of the base material (12), in particular a nickel layer with diamond granules, wherein the coating is comprised of at least two layers (7, 10) containing hard material granules, and an intermediate layer (9) free of hard material granules between the layers (7, 10) containing hard material granules. In case of a separation in places of the wear protection layer, such as can be caused by a scraper in the course of cleaning the spinning rotor, wear protection and spinning properties at the damaged places of the spinning rotor are preserved. As a result, it is possible to prevent a considerable shortening of the service life of the spinning rotor.

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: A spinning rotor for use at high speeds in open-end spinning machines has a rotor cup having an annular wall portion defining a rotor opening, a bottom wall portion merging with the annular wall portion, and a mounting hub extending exteriorly from the bottom wall portion. A rotor shaft is affixed to the mounting hub coaxially with the rotor cup. The merger of the bottom and annular wall portions of the rotor cup defines a maximum exterior diameter of the rotor and an interior rotor groove. The annular wall portion, the bottom wall portion and the mounting hub are of different cross-sectional thicknesses with the cross-sectional thickness of the bottom wall portion increasing from the rotor groove to the mounting hub. The wall thickness is less than 1.

Abstract: A spinning rotor (1) with a spinning cup (2) has an interior surface coated with a nickel dispersion layer (6) of an essentially even layer thickness having a concentration of hard material grains (7) embedded therein which is clearly less at the surface of the fiber slide face (9) than in the rotor groove. The coating is produced by bathing the spinning cup in a nickel dispersion bath during the final stage of which the concentration of the hard material grains in the bath is reduced at least in the bathing area, while the spinning cup is moved in this bath and rotated around its longitudinal axis while maintaining the spinning cup in a spatial orientation relative to the bath wherein an imaginary plane passing through the rotor groove is at least approximately perpendicular to the surface of the nickel dispersion bath.

Abstract: In the case of a rotor cup for an open-end spinning aggregate comprising a rough-surfaced fiber collecting groove and a smooth fiber sliding surface it is provided that hard particles are rolled into the fiber collecting groove. The fiber collecting groove is preferably provided with a soft nickel plating before the particles are rolled in, after which the nickel plating is then hardened.

Abstract: The present invention relates to a spinning device, e.g. an open-end spinning rotor (1) with a fiber guiding surface which is provided with a nickel-diamond coating (3) consisting of at least one inner bearing layer (30) and an outer working layer (31). The diamond grains (40) imbedded in the inner bearing layer (30), with a size between 3.5 .mu.m and 5 .mu.m, are larger than the diamond grains (41) imbedded in the outer working layer (31). The inner bearing layer (30) and working layer (31) are interlaced. In manufacture the fiber guiding surface to be provided with a wear-resistant nickel-diamond coating (3) is subjected to at least two coating procedures, whereby in the first coating procedure the bearing surface (30) is produced with larger diamond grains (40) and in the second coating procedure the working layer (31) is provided with diamond grains (41) which are smaller than the diamond grains imbedded in the bearing layer (30).

Abstract: In the case of a rotor cup for open-end spinning aggregates, a smooth fiber sliding surface and a rough-surfaced fiber collecting groove are provided. By means of two separate plating processes, the fiber collecting groove is provided with a nickel-diamond plating and the fiber sliding surface is provided with a purely nickel plating.

Abstract: For an opener roller for an open-end spinning device provided with a basic body by which it is connected to a supported shaft for rotatable support, it is proposed that the clothing be attached to the basic body via a clothing holder, whereby fasteners are used. For the fixed allocation of the clothing holder to the basic body it is provided that the attachment of the clothing holder by means of the fasteners be effected from the side of the opener roller which is facing the shaft bearing. The face of the opener roller away from the shaft covers the shaft, so that this face of the opener roller is also an even surface.

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 open end spinning method includes the step of providing a spinning chamber with an annular slip wall. A sliver of fiber material is placed onto the annular slip wall that widens continuously in the direction of sliver introduction into the spinning chamber. The angle of the annular slip wall to a rotational axis of the spinning chamber is between 8.degree. and 12.degree.. A yarn is formed from the fiber material in the yarn formation zone which is located within the portion of the annular slip wall upstream of a widest diameter of the annular slip wall viewed in the direction of sliver introduction. The fiber material is removed as a yarn from the spinning chamber through a yarn removal channel, extending along the rotational axis of the spinning chamber, in the direction opposite the direction of sliver introduction.

Abstract: A rotor for an open-end spinning machine. A spinning portion of a bottomed cylindrical body has a hollow portion where twisted yarn is formed by a continuous twisting operation while gathering short fiber groups in the maximum diameter portion of the spinning chamber. A rotary shaft is joined to the spinning portion. The spinning portion is made of a silicon nitride sintered body which includes no less than 60% silicon nitride grain having an aspect ratio not less than 3, and an average grain size of from 0.1 to 10 .mu.m. The rotor is hardly damaged at a high speed rotation of 100,000 r.p.m. or more, and the yarn strength and the yarn quality are not reduced even after an extended use of the rotor for a long time.

Abstract: An open end spinning rotor wherein the fiber guiding inner surface consists of a wear resistant surface layer of iron boride. The fiber guiding inner surface comprises a fiber sliding surface adjacent to a fiber collecting groove. The fiber collecting groove has a greater frictional resistance than the fiber sliding surface relative to the spinning fibers. This is achieved by means of a special structured surface of the fiber collecting groove. The structure surface of the fiber collecting groove can be created by a roughening of the boronized surface layer by means of a laser for instance, or alternatively, the structure can be created before the boron treatment by mechanical means such as roll pressing.

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: 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: 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: 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: 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 fiber or yarn contacted element of a textile machine, such as a rotor of an open-end spinning machine or the like, has, at the fiber or yarn coating surface, a body portion of steel, a boronized layer formed on the body portion, an alpha-iron layer formed on the boronized layer and a nickel coating layer. A process for producing a fiber or yarn contacted element of a textile machine includes boronizing a steel body portion to form a boronized surface thereon, heating the steel body portion in an atmosphere including nitrogen to methanol to produce an alpha-iron layer, quenching and heating the steel body portion and applying a nickel coating thereto.

Abstract: A process is provided for producing an open-end spinning rotor assembly. A boron treatment material is applied only to the fiber collecting groove area of the rotor of the spinning rotor assembly. Subsequently, a spinning enhancement material is applied over the boron treated fiber collecting groove and over a sliding wall area of the rotor. An assembly treated with boron treatment material and spinning enhancement material is also provided.

Abstract: The chiplessly formed open end spinning rotor (1) has, in the region of its collecting groove (11), a surface which has not been contacted by shaping tools. To produce it, a pot (3) is first made by stretching and stamping of flat material. This is then secured in its radial position independently of shaping tools. The peripheral wall of the pot (3), in the region between the later collecting groove (11) and the open edge of the pot (3), is upset inward by any optional kind of plastic deformation and the region later to be the collecting groove (11) by unsupported plastic deformation ["against air"].

Abstract: At least the collecting groove surface of a chiplessly formed, open-end spinning rotor is not contacted with shaping tools as the groove is formed. Such collecting groove may have a surface including a number of smooth, uniformly distributed islets formed thereon during initial production of an intermediate product pot. To produce the rotor, a pot is first made by stretching and stamping flat material. The pot is then subjected to plastic deformation, such as roll pressing, to affect a peripheral wall of the pot to form the collecting groove between such peripheral wall and a bottom of the pot. Such plastic deformation may further optionally be accomplished without interior support of the walls thus formed, with the result that such undistributed slip walls also have smooth, uniformly distributed islets thereon.

Abstract: A spinning rotor for an OE spinning machine includes a rotor body having a fiber sliding surface formed thereon and having a fiber collection groove formed therein defining another surface, at least one of the surfaces having a multiplicity of erosion craters formed therein, and a method for producing the spinning rotor.

Abstract: In an open-end spinning rotor comprising two separately-formed rotor parts subsequently connected to one another, a parting gap between the two rotor parts opens into the fiber-collecting groove and is formed at least partially as a weld seam connecting the two rotor parts. At least part of the fiber-collecting groove may be formed by an insert ring to increase the wear-resistance of the groove. The ring, adjoining a sliding wall of the upper rotor part, is clamped between the two rotor parts and thereby radially inwards limits the parting gap inwards. To produce one of the present open-end spinning rotors, during welding the two rotor parts are so arranged relative to the welding location and rotated past the latter that the weld seam forms on the outside of the spinning rotor and does not project into the fiber-collecting groove.

Abstract: A spinning rotor of an open-end spinning machine, includes a steel body having a sliding surface formed thereon and a collection groove formed therein for spinning fibers, a surface layer disposed at least on the interior of the body formed of at least one material from the group consisting of iron carbide, iron boride, iron silicide and iron nitride, the interior surface layer including a portion coming in contact with the spinning fibers, and an additional coating disposed on the portion being formed of non-ferrous metal having granules of a hard substance embedded therein.

Abstract: A spinning rotor for an open-end spinning device and a method of making same is disclosed. A spinning rotor arrangement includes a shaft carrying a rotor including a sliding wall starting at one open face side of the rotor and diversing conically outward of the rotor axes. A fiber collecting groove is connected to the sliding surface and forms the greatest inner diameter portion of the rotor. The surfaces of the fiber collecting groove are hardened by a plastic deformation process.

Abstract: An improved spinning rotor for an open-end spinning frame is disclosed herein, according to which the rotor is made of steel, and selected portions of its interior peripheral surfaces, including the fiber-collecting groove thereof, which is formed along the maximum-diameter region within the spinning chamber, are heat-treated by a focused laser beam or focused electron beam to harden the same. Due to the nature of laser beams, only those areas which require surface hardening are heat-treated without heating the entire rotor body, so that no strain or distortion is developed in the rotor during the heat treatment process. As a result, the rotor is heat-treated to provide excellent wear-resisting properties and exceptional stability in operation at an extremely high speed for an extended period of service.

Abstract: Spinning rotor for an open-end spinning machine including a rotational body having a hollow interior, the body being formed of steel and having thereon a surface layer formed of at least one of the compounds iron carbide, iron boride, iron silicide and iron nitride at least at locations of the hollow interior thereof at which the spinning rotor comes into contact with spinning fibers being spun into a thread, the steel body with the surface layer thereon being tempered and having increased ductility at high elastic limits, and a method of manufacturing a spinning rotor.

Abstract: Open-end spinning device, including a rotor housing, a spinning rotor being disposed in the rotor housing and having an inner surface, a housing cover having a fiber feeding channel formed therein, a thread delivery orifice being at least partly disposed in the cover and having a hard and wear-resistant material surface at thread deflection locations, and a surface layer of wear-resistant material disposed on the inner surface of the spinning rotor, the surface layer having areas of different wearability distributed therein.

Abstract: Open-end spinning device, including a rotor housing, a spinning rotor disposed in the rotor housing, a housing cover having a fiber feeding channel formed therein being in communication with the rotor, a thread delivery channel disposed in the cover, and a thread delivery orifice being at least partly disposed in the cover and being in communication with the thread delivery channel and rotor, the orifice having a hard and wear-resistant surface layer at thread deflection locations, the surface layer having areas of different wearability distributed therein.

Abstract: An open-end spinning rotor (2) consisting of a basic member (8) and a rotor member (9). The basic member is carried by a bearing and drive element (81, 82, 83) and comprises a substantially radial supporting surface (80) with a centering surface (31) at its outer edge, with which a centering surface (40) of the rotor member (9) co-operates. A connecting element (5) which affords a detachable connection between basic member (8) and rotor member (9) is disposed separately from the centering surfaces (31, 40).

Abstract: A spinning rotor for use at high speeds in open-end spinning machines has a rotor cup having an annular wall portion defining a rotor opening, a bottom wall portion merging with the annular wall portion, and a mounting hub extending exteriorly from the bottom wall portion. A rotor shaft is affixed to the mounting hub coaxially with the rotor cup. The merger of the bottom and annular wall portions of the rotor cup defines a maximum exterior diameter of the rotor and an interior rotor groove. The annular wall portion, the bottom wall portion and the mounting hub are of different cross-sectional thicknesses with the cross-sectional thickness of the bottom wall portion increasing from the rotor groove to the mounting hub. The wall thickness is less than 1.