Abstract: An OE friction spinning device having a fiber loosening device and device for forming a spinning wedge, improvement includes a fiber conducting channel having a wall, a device for generating a transporting air current in the fiber conducting channel for carrying fibers from the fiber loosening device to the spinning wedge, the wall having at least two openings formed therein being spaced from each other along the transporting air current for the passage of guiding air forming at least one guiding air stream parallel to the transporting air current in the fiber conducting channel.

Abstract: Fibers delivered in a freely floating state in a fiber transport passage are to be laid in a predetermined disposition on a friction spinning element, such as a friction spinning drum or disc. For this purpose, an opening region of the fiber transport passage is provided with a converging portion in which the airstream is supplementarily accelerated relative to a preceding acceleration. This supplementary acceleration serves to assist in bringing the fibers into the predetermined disposition on the friction spinning drum. The friction spinning device comprises an opening roller which is rotatably supported in a housing. The housing is connected to the fiber transport passage. The opening of the fiber transport passage extends close to a cylindrical surface of the friction spinning drum. The fibers leaving the opening are transported on the friction spinning drum towards a yarn formation position where they are twisted into a yarn which is withdrawn in a selectable withdrawal direction by withdrawal rollers.

Abstract: An arrangement for open-end friction spinning having rollers that are rotatably arranged next to one another in fixed relation is provided wherein the fiber feeding duct assigned to the wedge-shaped gap is also mounted stationarily. As a result, inaccuracies are avoided in adjustment of the mouth of the fiber feeding duct with respect to the wedge-shaped gap. For cleaning of the fiber feeding duct and the wedge-shaped gap, it is provided that the fiber feeding duct is connected to a compressed-air supplying pipe so that a jet of compressed air is blown through the fiber feeding duct into the wedge-shaped gap.

Abstract: Yarn having properties approaching that of ring spun yarn is produced by vacuum spinning, including directly from sliver. The elongated hollow shaft of the vacuum spinning apparatus has a vacuum reservoir, or interior chamber, that is generally in the shape of a right circular cone, and the interior passageway of the shaft from the first end thereof to the interior chamber can have the form of a right circular cone frustum. The perforations operatively connected to the interior chamber have a generally wedge-shape. The perforations and the passageway sections between the first end of the shaft and the perforations are dimensioned so that they allow sufficient air flow to achieve optimum fiber wrapping action.

Abstract: A method and an apparatus for production of yarn by friction spinning is disclosed. The friction spinning method employs a perforated friction spinning drum towards which a fibre feed passage projects. An opening roller, known from the open-end rotor spinning process, feeds separated fibres into the fibre feed passage, which fibres are taken up by a transport air flow in the fibre feed passage. This transport air flow is produced by the perforated friction spinning drum which is subjected to underpressure. Fibres leaving an opening of the fibre feed passage are laid in an inclined disposition on the perforated friction spinning drum and transported in this disposition towards a yarn end forming at a yarn formation position. The spun yarn is withdrawn by a withdrawal roller pair. Advantageously, a second friction spinning drum is provided parallel to the first perforated friction spinning drum to cause the fibre twisting-in process to take place in a more accurately defined manner.

Abstract: A spinning machine having a plurality of adjacently arranged spinning units is provided. Each spinning unit is developed as a construction unit along with at least one part of its related driving mechanism. The construction unit is respectively removable as a whole from the machine frame. The machine frame includes devices which require no high degree of precision in alignment with respect to the individual spinning units. These devices include, for example, air channels and cable channels and furthermore driving shafts with driving elements for slowly running drive mechanisms.

Abstract: A twisting member of a ringless spinning apparatus comprises a cylindrical ousing with blades on its peripheral side surface. Secured on the blades is a first disc with an eccentric passage extending therethrough for the advancement of fibres, this disc acting as one gripping element of a device for gripping the fibres. The other gripping element is in the form of a second disc with an axial passage which is coaxially mounted on one end of a spring-biased sleeve in a position facing the first disc with the eccentrically extending passage and defining a gap with this first disc. The sleeve is coaxially accommodated in the housing.

Abstract: In the case of an open-end friction spinning machine having a plurality of spinning units that are arranged next to one another and having a movable servicing apparatus carrying out a piecing process, it is provided that approximately in the extension of the yarn formation zone facing away from the withdrawal device, a twist blocking device is provided for receiving a yarn end that is returned beyond the feeding point. The device for the yarn withdrawal is switched on when the yarn end is in the yarn formation zone of the friction elements so that the yarn end is opened up into a fiberbeard that is suitable for piecing while being held by the twist blocking device.

Abstract: In a friction spinning process, a method is provided for preventing build up of dust and fly etc. inside a friction spinning machine (1) which method comprises the steps of introducing into the machine a flow of filtered air at a pressure just sufficient to substantially prevent the ingress of unfiltered air during spinning. The invention also provides apparatus for performing the method described, which apparatus comprises filter means (19), pressurizing means (20), ducting (22, 23) adapted to permit the outflow of clean pressurized air into the inside of the machine (1) adjacent the or each spinning head (3) at a pressure sufficient to substantially prevent the ingress of unfiltered air during spinning.

Abstract: An open-end friction spinning machine having a plurality of spinning units, each having two rollers that are arranged next to one another and form a wedge-shaped yarn-forming gap is provided with a yarn guard for sensing yarn breakage in each spinning unit. In response to yarn breakage sensed by an individual yarn guard of a spinning unit, a wind-up spool is lifted off its driving roller and the rollers are stopped. Preferably, a control element is provided for lifting-off of the wind-up spool, and at the same time triggering the stoppage of the rollers and/or switching-off of a suction device arranged adjacent the wedge-shaped yarn-forming gap.

Abstract: In order to make the start-up of spinning easier and to obtain a spinning triangular zone which is easily accessible and easily observed, the feeding in of fibers is provided at a rear triangular zone 35 whereas the twisted spun yarn 6 is withdrawn from the other triangular zone 36 in parallel to the plane 34 of the closest distance between the two spinning members 1, 2. The fibers have to pass a narrow section, since the triangular zone 36 is disposed oppositely to the triangular zone 35 versus the line of adjacency of the two spinning members. Suction openings 3' 4' of the suction provisions 3, 4 are directed toward that triangular zone 36 from which the spun yarn is withdrawn. The fiber input location 5' of the fiber feed provision 5 is directed toward the surface of that spinning member 1 whose surface 32 moves in the direction of the first triangular zone 35.

Abstract: In the case of a friction spinning machine having at least one spinning unit containing two friction rollers that are arranged next to one another to form a wedge-shaped yarn forming gap serving as the yarn forming zone, it is provided that in the area located opposite the yarn forming point the friction rollers are covered by a housing side and that by means of periodically switchable means, an air flow is produced between the housing side and the rollers.

Abstract: A device for open-end friction spinning having two adjacently arranged rollers forming a yarn forming wedge-shaped gap therebetween is provided with a suction channel having an effect extending essentially in the direction of the wedge-shaped gap. This suction channel serves for drawing in a yarn end for a piecing operation. It is furthermore provided that this suction channel is selectively connectible to an air pressure source in order to provide a blast of air against the rollers in the region of the wedge-shaped gap. The blast of air serves to clean the rollers and remove debris prior to a piecing operation.

Abstract: A method and apparatus for the cleaning of a spinning unit of an open-end friction spinning machine is disclosed for spinning units of the type containing two rollers arranged next to one another, drivable in the same rotational direction and forming a wedge-shaped yarn forming gap. It is provided according to the invention that a device for carrying out the cleaning is applied to the area of the wedge-shaped gap and that, during the cleaning, the yarn and fiber holding forces directed to the wedge-shaped gap during the spinning operation are eliminated or at least reduced. Preferred disclosed embodiments reduce the yarn and fiber holding forces during cleaning by reducing or interrupting the suction forces and by stopping or reversing the rotation of at least one of the friction rollers.

Abstract: An open-end friction spinning machine is disclosed which has a plurality of adjacently arranged spinning units, each spinning unit including two adjacently arranged friction rollers driven in the same rotational direction and forming a wedge-shaped yarn forming gap therebetween. At least the friction roller rotating out of the wedge-shaped gap exhibits a closed cover surface. To assure consistent predetermined yarn characteristics, friction roller conditioning devices are disclosed for conditioning the friction surfaces of the friction rollers with closed cover surfaces.

Abstract: In the case of a device for open-end friction spinning having two friction rollers that are arranged next to one another to form a wedge-shaped gap and are drivable in the same rotational direction, an arrangement is provided for the feeding and opening of a sliver which contains an opening roller from which a fiber feeding duct leads to the wedge-shaped gap. A compressed air duct that is led past the opening roller is connected to the fiber feeding duct for supporting the fiber transport. A dirt discharge opening assigned to the circumference of the opening roller is arranged at a distance to the compressed air duct in such a way that the effect of the excess pressure does not reach back into the area of the dirt discharge opening.

Abstract: An open-end friction spinning machine is disclosed which has a large number of spinning units arranged next to one another, each containing two friction rollers arranged next to one another to form a wedge-shaped yarn forming gap. By means of a joint drive the friction rollers are driven in the same rotational direction. A servicing apparatus is provided which in each case can be applied to a spinning unit, said servicing apparatus having an auxiliary drive for the friction rollers, said auxiliary drive containing an auxiliary drive element that can be applied simultaneously to the shell surfaces of both rollers.

Abstract: In the case of an arrangement for open-end friction spinning having two friction rollers that are arranged next to one another to form a wedge-shaped yarn forming gap, the frictional effect is reduced in the area of the yarn tip of the forming yarn. As a result, it is avoided that the yarn tip moves through the wedge-shaped gap. It is also ensured that a fiber transport takes place into this area of the wedge-shaped gap where the yarn tip is formed. This fiber transport is caused by an air current generated by an additional suction device, acting as an extension of the yarn tip.

Abstract: A friction spinning frame including a pair of twisting rollers disposed substantially in parallel and driven in the same direction to each other at a small gap therebetween to form a yarn forming zone of a valley shaped profile on upper surfaces of the twisting rollers along the gap. At least one of the twisting rollers is a perforated hollow roller including an outer shell having a plurality of perforations on the entire outer surface thereof and a suction device for providing a suction force through the perforations, whereby staple fibers are twisted to form a yarn while being sucked and held on the yarn forming zone.

Abstract: For the stopping and starting of an open-end friction spinning unit or of a spinning machine consisting of a plurality of such open-end friction spinning units, it is provided that the switching-off of the drives takes place in such a controlled manner that the yarn end forming by means of the switching-off of the fiber supply remains in the sphere of action of an auxiliary suction device. As a result, the restarting and the connected piecing are facilitated since the yarn end, in a controlled manner, remains inside the spinning unit and does not have to be returned by additional means. The yarn end is sucked into an auxiliary suction device and is preferably clamped in at least during the stoppage of the spinning unit or of the machine.

Abstract: A spinning device for manufacturing a twisted thread at least partially formed of spinning fibers, includes a perforated drum rotating about a given axis of rotation, a suction device disposed in the drum, the suction device having at least one suction opening formed therein extended substantially parallel to the given axis of rotation, a device disposed outside the drum opposite the suction opening for forming a wedge-shaped area for spinning fibers, a device for conducting flying spinning fibers into the wedge-shaped area, and a device for pulling out a spun thread substantially parallel to the given axis of rotation, the forming device including a shell carrier rotating about a longitudinal axis and a flexible shell disposed on the shell carrier.

Abstract: Apparatus for making a yarn comprises two juxtaposed, closely spaced apart suction drums, which rotate in the same sense, and a fiber-guiding duct, which protrudes into the triangular space between the suction drums and serves to supply single fibers. In order to ensure a uniform tying of the single fibers into the yarn as it is formed, the length of the outlet opening of the fiber-guiding duct exceeds the average length of the longest fibers to be processed. Besides, the distance from the outlet opening of the fiber-guiding duct to the common diametral plane of the suction drums is such that the arc length of the periphery of each suction drum from the point which is nearest to said outlet opening to said common diametral plane is not in excess of 0.5 radians.

Abstract: For the piecing of a yarn of a spinning unit of an open-end friction spinning machine, it is provided that a yarn an brought into the wedge-shaped gap is pieced, while forming a yarn piecing, which, before a renewed winding-up of the yarn, is cut out and is replaced by a yarn connection connecting the new yarn with the yarn leading to the spool. The formation of the yarn piecing takes place at a production speed that is reduced as compared to the normal spinning operational speed, said production speed being brought to the operational value only after the making of the yarn connection. It is also provided that the yarn spun during the formation of the yarn connection is taken up by a yarn storage device, which is emptied more rapidly because of the fact that the wind-up speed as compared to the withdrawal speed has a larger speed difference than the operational wind-up speed has with respect to the operational withdrawal speed.

Abstract: An apparatus and method for producing a spun yarn having true twist comprising extracting staple fibers from a bundle of staple fibers; and collecting the extracted staple fibers on the periphery of a spinning rotor; and recontacting the extracted fibers with the bundle of staple fibers to form a combined untwisted yarn; and twisting the combined untwisted yarn to produce a twisted yarn; and withdrawing the twisted yarn from the spinning rotor.

Abstract: An open end friction spinning machine is provided which exhibits a plurality of adjacently arranged spinning units, each spinning unit including two adjacently arranged rollers forming a wedge-shaped gap. Yarn formation takes place inside the wedge-shaped gap with the assistance of a friction effect of the rollers. This friction effect is dependent on the one hand on the outer surface structure of the rollers and on the other hand on the strength of the suction effect of a suction device creating a suction air stream in the wedge-shaped gap. It is provided that the outer surface structure of the rollers is examined so that a portion of the friction effect dependent upon the outer surface of the rollers can be determined. In order to maintain the entire friction effect in a predetermined range, the suction effect of the suction device can be adjusted corresponding to the measured value of the friction effect due to the outer surface of the rollers.

Abstract: An open-end friction spinning machine is provided having two adjacently arranged rollers that are drivable in the same rotational direction and form a wedge-shaped gap serving as a yarn formation zone. A fiber feeding device forms a scatter zone in which fibers scattered over a limited area of the axial length of the rollers are fed to the wedge-shaped gap. In the scatter zone, the rollers have sections with surfaces resulting in different frictional effects. Additionally, the sections of the two rollers that are opposite one another have different frictional effects. This difference in frictional effects between oppositely disposed roller sections can be used to create forces which either maintain forming yarn in the wedge-shaped gap during a yarn forming operation, or displace formed yarn from the wedge-shaped gap after a yarn forming operation.

Abstract: A method for piecing on a thread in friction spinning machines, having at least one friction surface with a perforated wall defining a spinning wedge at the wall includes moving the friction surface, eliminating the movement of transport air through the perforated wall of the friction surface, supplying fibers to the spinning wedge, sucking away the fibers, subsequently moving a thread to be pieced on into the spinning wedge, resuming suction of transport air through the perforated wall of the friction surface, ending suction of the fibers, and continuously withdrawing the thread from the spinning wedge, and a device for carrying out the method.

Abstract: An arrangement is disclosed for open-end friction spinning with two adjacently arranged friction rollers driven in the same rotational direction and forming a wedge-shaped yarn forming gap. The wedge-shaped gap is at least partially accessible for purposes of maintenance. A fiber inlet and opening device is provided which contains a fiber feed channel leading to the wedge-shaped gap. The fiber feed channel includes at least two component parts divided by a partitioning line extending in the feed channel longitudinal direction wherein one of the component parts is moveable with respect to the other portions of the channel for exposing the wedge-shaped gap at least in the fiber supply opening area of the fiber feed channel.

Abstract: An arrangement is disclosed for open-end friction spinning with two adjacently arranged friction rollers driven in the same rotational direction and forming a wedge shaped yarn forming gap. An inlet and opening device is provided for feeding single fibers to the wedge gap, and a yarn withdrawal device is provided for drawing off the yarn being produced in the longitudinal direction of the wedge gap. Between the inlet and opening device and the friction rollers a closed fiber feed channel is arranged which includes devices for reducing the flight speed of the fibers so that the optimum high speed operation of the opening device is facilitated while the fiber speed is subsequently reduced to optimize the yarn forming process.

Abstract: A spinning device for producing an at least partially twisted spun thread formed of spinning fibers, includes a perforated drum having a given axis of rotation about which the drum rotates in a given direction, a suction device disposed at least partially in the drum having at least one suction opening formed therein extended substantially parallel to the given axis of the drum, a device disposed opposite the at least one suction opening outside the drum for forming a wedge-shaped path for the spinning fibers, a device for conducting flying spinning fibers to the wedge-shaped path, and a device for withdrawing a spun thread substantially parallel to the axis of the drum, the wedge-shaped path forming device including an endless transport belt moving in a direction opposite the given direction at a distance from the drum during spinning.

Abstract: Apparatus for making a yarn comprises a device which succeeds a drawing frame and serves to twist a drawn roving and to wind covering fibers around the drawn roving, and means for supplying the covering fibers. In order to ensure that the covering fibers can be uniformly wound around the roving in a structurally simple apparatus, two spaced apart, coaxial twisting members are provided as well as a ring, which is disposed between and coaxial to the twisting members and serves to supply the covering fibers. Air is sucked from a portion of the periphery of the ring, which can be driven to rotate in the same sense as the twisting members but at a different surface speed. The line of yarn formation extends on the receiving twisting member and the ring to the delivering twisting member along a helix, which has a hand in the sense of rotation of the twisting members.

Abstract: A friction spinning apparatus, includes oppositely-disposed, rotationally-symmetrical friction elements rotating in the same direction, the friction elements having perforated casings defining a line of closest mutual approach between the casings and two wedge-shaped regions adjacent the line of closest mutual approach, stationery suction devices disposed in the casings, the suction devices having suction apertures directed toward the perforated casings, a fiber feeding device for feeding spinning fibers along a yarn withdrawing direction, and a yarn withdrawing device for withdrawing yarn, each of the casings including a yarn formation zone receiving the spinning fibers at substantially the furthest upstream portion of the casings in the yarn withdrawing direction for continuously forming yarn, a curved transition zone downstream of the yarn formation zone, and a yarn consolidation zone downstream of the transition zone, the yarn consolidation zone being separate from and having a longitudinal axis disposed

Abstract: In an open-end friction spinning machine having a plurality of spinning units, each containing two friction rollers that are arranged next to one another, form a wedge-shaped gap and are drivable in the same rotational direction by means of a belt drive, a common belt drive is employed. Each spinning unit is equipped with an automatic disengaging device for disengaging the belt drive of that unit. This disengaging device contains at least one spring-loaded tension pulley holding the belt drive in the driving position. The operational position of the tension pulley is secured by means of a locking device, and the tension pulley is automatically disengaged from the drive belt when the locking device is opened.

Abstract: An open-end friction spinning arrangement is disclosed with two adjacently arranged rollers driven in the same rotational direction and forming a wedge-shaped yarn forming gap with their cover surfaces. It is provided that the cover surfaces of at least one of the rollers is designed such that it includes different axial zones in the area of the yarn formation region and in the yarn withdrawal direction, in which different radial forces and/or different rotational speeds act upon the yarn being produced.

Abstract: A method and apparatus for open-end friction spinning is disclosed having two adjacently arranged friction rollers, driven in the same rotational direction and forming a wedge-shaped gap therebetween. A suction device effective in the area of the gap as well as a fiber feed channel leading to the gap and a yarn withdrawal device for drawing off the produced yarn in the direction of the gap are also provided. It is further provided that the mouth of the fiber channel extending at a tangential angle to the gap is widened in the area of the gap in that the channel wall facing the same is formed with a rounded curve. By these measures the fiber deposition in the gap is improved by modifying the fiber transport air stream path to deposit the fibers in a straightened and parallel manner in the gap.

Abstract: A process and apparatus for piecing a yarn at a spinning unit of an open-end friction spinning machine is disclosed. Before the return of the yarn end, the wedge-shaped yarn forming gap is exposed by moving away a lid-type component containing at least one part of the fiber feeding channel, after which the yarn end is introduced into the mouth of the fiber feeding channel of this lid-type component, and subsequently, the lid-type component is returned to its position covering the wedge-shaped gap. Subsequently, the actual yarn piecing process is carried out by switching on the yarn withdrawal device and the yarn feeding device as well as by the transfer of the end of the yarn end to the wedge-shaped gap.

Abstract: An open-end friction spinning machine is disclosed having a plurality of spinning units which each include adjacently arranged rollers driven in the same rotational direction and forming an accessible wedge-shaped yarn forming gap. A fiber inlet and opening device is provided for opening fiber material to be spun. A fiber feed channel connects to the inlet and opening device and has its fiber feed outlet opening to the yarn forming gap. The yarn withdrawal device draws off the produced yarn in the longitudinal direction of the yarn forming gap. Each spinning unit is provided with a channel carrier removable for the exposure of the yarn forming gap, which channel carrier forms at least one portion of the fiber feed channel containing the fiber feed outlet opening of the same. The channel carrier is adjusted in its operational position by means of centering means with respect to both the inlet and opening device and the bearing housing for the friction rollers.

Abstract: A fiber feed arrangement for an open-end friction spinning machines is disclosed. The fiber distribution zone in the wedge-shaped yarn forming gap formed by the friction rollers is configured in its size and/or its location relative to the friction rollers in dependence on the fiber length being processed and/or the desired yarn characteristic. In preferred embodiments the distribution zone is adjustable by means of at least one separate movable feed channel component in the area of the feed channel opening to the friction rollers.

Abstract: A process and apparatus is disclosed for improving the start-spinning of yarn on an open end friction spinning machine. To facilitate an exact alignment of the return yarn end to be pieced up with newly supplied incoming fibers, the respective spinning units are provided with a moveable cover part which in the open position exposes the yarn forming wedge slot between the friction rollers. Devices are provided for returning the yarn end and holding the same at a slight spacing from the friction rollers at the wedge slot and for sequentially timing the yarn draw off during start spinning with the activation of the fiber feed and the suction air flow related thereto.

Abstract: An open end friction spinning machine is described with a plurality of spinning units which respectively each include two similarly driven, adjacently arranged, friction rollers forming a wedge slot for forming yarn, an inlet and opening device for guiding in individual fibers to the wedge slot, a fiber feed channel connecting the inlet and opening device with the wedge slot, a withdrawal device for withdrawing the formed yarn in the direction of the wedge slot and a suction device to hold the formed and forming yarn in the wedge slot. To facilitate improved start spinning yarn connections, each spinning unit is provided in the region of the ends of the rollers opposite the withdrawal device with a guide element which securely holds the return guided yarn end portion in the region of the fiber feed opening of the fiber feed channel prior to the actual start spinning process.

Abstract: Method of preparing fibers fed from a fiber-loosening device into a wedge-shaped spinning zone of a friction spinning machine having friction elements moveable relative to one another, which includes feeding a fiber-laden carrier-air flow having a component directed parallel to the wedge-shaped spinning zone tangentially to one of the friction elements at a location outside the wedge-shaped spinning zone and in a direction opposite the direction of movement of the one friction element, simultaneously exerting holding forces on the fibers and flinging the fibers against the moving surface of the one friction element so that the fibers are stretched out and held fast thereon, conveying the fibers in held-fast condition thereof into the wedge-shaped spinning zone, rolling the fibers therein and integrating the fibers into a yearn, and drawing-off the thus-formed yarn.

Abstract: A spinning device for producing a twisted thread formed at least partially of spinning fibers, includes a flow generator having an air inlet and an air outlet, at least one rotating perforated drum having a given axis, a suction device disposed in the drum, the suction device having at least one suction opening disposed substantially parallel to the given axis and connected to the air inlet of the flow generator, another drum disposed outside the first-mentioned drum opposite the suction opening for forming a spinning wedge from flying fibers, a fiber loosening device for loosening fibers and conducting an air transport current, a fiber conduction channel for conducting the flying fibers and the air transport current from the fiber loosening device to the spinning wedge, means communicating with the fiber conduction channel for increasing the air transport current flowing through the fiber conduction channel, and an air conduction line connected from the air outlet of the flow generator to the air current inc

Abstract: A friction spinning machine having a plurality of friction spinning units, each of the spinning units including two rotatable parts forming a spinning wedge, and two whorls each being connected to a respective one of the rotatable parts, includes a device for driving the rotatable parts, the driving device including a common endless belt wound around both of the whorls, a drive roller around which the endless belt is wound for transmitting the belt drive, a tangential belt guided along the length of the friction spinning machine, and a device for engaging and disengaging frictional contact between the tangential belt and the endless belt or belt roller.

Abstract: A method of starting the operation of a friction spinning unit having friction surfaces displaceable in opposite directions and forming a spinning wedge, the spinning unit further having a fiber infeeding device, a thread take-up device for drawing a thread longitudinally through the spinning wedge, and at least one suction device acting upon the spinning wedge, at least one of the friction surfaces being formed by a sieve drum, the suction device having a suction nozzle acting upon the spinning wedge by sucking air through the wall of the sieve drum includes:(a) stopping the fiber infeed, and stopping the displacement of the friction surfaces;(b) stopping the flow of suction air from the spinning wedge through the wall of the sieve drum into the suction nozzle;(c) introducing into the spinning wedge through the wall of the sieve drum a suction air flow in a direction opposing the direction in which the thread is being drawn, and guiding the air flow out of the suction nozzle through the wall of the sieve dru

Abstract: Method for starting the operation of a friction spinning machine, including friction surfaces movable in opposing directions for forming a spinning wedge, a device for supplying fiber to the spinning wedge, a thread withdrawal device, at least one suction device acting on the spinning wedge during the spinning operation, a suction tube disposed at an end of the machine opposite the thread withdrawal device, and a suction air source connectible to the suction device and to the suction tube, which includes:stopping the fiber supply and the motion of the friction surfaces;disconnecting the suction device from the suction source;supplying suction air from the suction source through the suction tube at the spinning wedge for inserting a thread into the spinning wedge;keeping the thread in a tensioned condition in vicinity of the spinning wedge;operating the suction device with a given suction power;moving the friction surfaces around the thread with a given speed to remove the twist of the thread at a given locati

Abstract: A method of starting the operation of a friction spinning unit having friction surfaces displaceable in opposite directions and forming a spinning wedge, the spinning unit further having a fiber infeeding device, a thread take-up device for drawing a thread longitudinally through the spinning wedge, and at least one suction device acting upon the spinning wedge, at least one of the friction surfaces being formed by a sieve drum, the suction device having a suction nozzle acting upon the spinning wedge by sucking air through the wall of the sieve drum, by means of an automatic thread joining device, includes:(a) laying a thread into the spinning wedge;(b) initiating the infeed of spinning fibers into the spinning wedge;(c) connecting the friction surfaces with a thread-joining drive arrangement, and moving the friction surfaces in opposite directions with increasing speed;(d) continuously withdrawing the thread from the spinning wedge, and conducting it to a waste collector;(e) interrupting the travelling thre

Abstract: Open end friction spinning apparatus is provided in which there are one or more spinning units with respectively two adjacently arranged rollers, rotating in the same direction, and disposed to form a wedge shaped gap therebetween for accepting fibers and spinning them into a thread of yarn. A housing is provided for each spinning unit, which housing includes a stationary housing part carrying bearing devices for the rollers and a hingedly mounted cover type housing part connected at a pivot axle. The cover type housing part carries at least a part of a feeding channel for feeding fibers to the rollers to be spun.

Abstract: A method for starting the operation of a friction spinning machine, including friction surfaces movable in opposing directions for forming a spinning wedge; the friction surfaces being movable in a spinning direction during a spinning operation, a device for supplying fiber to the spinning wedge, at least one suction device acting on the spinning wedge, a suction tube supplied with suction air, and a thread withdrawal device includes:stopping the fiber supply and the motion of the friction surfaces;stopping the suction;moving the suction tube through the spinning wedge in a given direction for sucking in thread and fiber remains;subsequently sucking a thread through the suction tube; moving the suction tube out of the spinning wedge in a direction opposite said given direction depositing the thread in the spinning wedge;resuming the suction at least as late as the step of moving the suction tube out of the spinning wedge;moving the friction surfaces in a direction opposite the spinning direction removing the

Abstract: A yarn joined to a previously spun yarn is spun in friction spinning apparatus which comprises two juxtaposed, closely spaced apart twisting members, which define a triangular space, from which air is sucked. Singled stable fibers supplied to said triangular space are twisted together by said twisting members to form a yarn, which is withdrawn by a withdrawing device. A joint-forming portion of a previously spun yarn is provided in said triangular space in the region in which said fibers are supplied to said space, and said yarn is withdrawn while fibers are supplied to said triangular space so as to contact said joint-forming portion.

Abstract: Apparatus is disclosed for adjustably supporting the friction rollers for an open-end friction spinning unit having two friction rollers that are arranged next to one another and form a wedge-shaped yarn forming gap. The rollers are mounted by means of bearings on non-rotating axles. In the area of the end faces of the friction rollers the non-rotating axles are held by means of holding devices, the spacing of which can be adjusted. Four holding devices arranged in pairs are provided for the axles, where at least between the holding devices of one pair, an adjusting screw is mounted extending transversely to the wedge-shaped gap, by means of which the spacing of said holding devices and thus the size of the wedge-shaped gap, can be adjusted.