Abstract: A frictional false twister is disclosed. The twister has a plurality of rotating friction plates located between the nip of the front rollers and the yarn guide. The friction plates are staggeringly arranged for rubbing a twisted yarn. The spinning direction of the twisted yarn is opposite to the rotating direction of the friction plates. Through the action of the frictional false twister, the twist of the yarn between the false twisting device to the front nip can be increased, shortening the twisting triangle height, and increasing the spinning strength. As the yarn and the outer surface of the friction plate make relative sliding and rubbing, the friction damping force correspondingly reduces the spinning tension in the twisting triangle.

Abstract: A spinning machine for spinning a strand of travelling wool fibers to form a yarn. The machine includes an exit nip, a rotatable spindle for drawing the fiber assembly from the nip while a twist is inserted into the fiber assembly to form a yarn, and a false twisting device, which in use is a travelling continuous belt. The belt has a pair of runs at least one of which is engaged by the twisted yarn as it is drawn past such that a surface surface(s) of the belt imparts a false twist into the yarn. The belt includes a core made from a first material and surrounded by an external portion which is made from a second material, both the core and external portion extending through the belt. Rigidity of the first material is substantially higher than that of the second material.

Abstract: A method and apparatus for imparting false twist to a short staple yarn delivered from a nip of a pair of front drafting rollers before ring spinning. Downstream of the nip, the twisted yarn is drawn sequentially across first and second runs of travelling endless belts, such that the yarn wraps about a first convex surface of the first run, then passes between the first and second runs, before wrapping about a second convex surface of the second run. Friction between each of the first and second convex surfaces and the yarn imparts the false twist in a common direction. Maintaining a differential between first and second linear speeds of the first and second runs, respectively, has been found to reduce yarn defects, particularly the nep count.

Abstract: Method and apparatus for reducing residual torque in singles ring yarns, achieved by imparting two separate false twisting points on the traveling strand of fibers (or yarn) after the strand exits from the spinning triangle with a proper ratio between the belt speed and the strand feeding speed. In addition to reducing the residual torque, this double false twist technique also reduces yarn hairiness to the same level as achieved by more expensive compact spinning devices, reduces yarn twist by more than 20% and significantly enhances yarn and fabric softness. Furthermore, by combining the double false twist technique with a compact spinning device, the numbers of neps, thick and thin places are significantly reduced to produce high-quality yarns and fine-count yarns.

Abstract: Two false-twist belts are each entrained about crowned pulleys. The belts are arranged so that their outer-facing surfaces cross one another with one belt pressed against the other. Yarn is passed between these false-twist belts and twisted. The bending rigidity in the lateral direction of the false-twist belts is set to a value in which the outer-facing surfaces of the false-twist belts are rounded into a convex curvature at the position where the belts are pressed against each other.

Abstract: According to the false-twist texturing method of the yarn including poly lactic acid fiber, the false-twisting device 8 is made to be a nip typed false-twisting device and the heating temperature by the first heater 5 is made to be lower than or equal to 130° C. The false-twist texturing method of the present invention is capable of eliminating the yarn breakage of the poly lactic acid fiber which is weak against the friction and the heat, due to the twisting by the false-twisting device and the heating by the first heater.

Abstract: Optical fiber is provided with a periodically reversing spin while the fiber is pulled through a melt zone. A cooled region of the fiber downstream from the melt zone passes between a pair of opposed elements. The opposed elements are moved so that surface regions engaging the fiber move in opposite lateral directions relative to one another, thus spinning the fiber about its axis. The lateral movement of the engaged surface portions is periodically reversed to reverse the spin direction. The opposed elements may include belts or rollers, which can be tilted to orientations oblique to the longitudinal direction of the fiber.

Abstract: By appropriately controlling a yarn tension of an upstream side from a false twist device, variations in yarn quality among packages can be eliminated. A false twist texturing unit 7 which imparts a yarn Y with a false twist, a first feed roller 4 arranged in the upstream side from the false twist texturing unit 7, and an upstream side yarn tension control device 30 which automatically adjusts the rotation speed of a first feed roller 4 such that the upstream side yarn tension T1 is maintained within a fixed range are provided. A downstream side yarn tension control device 35 which automatically adjusts the false twist device 7 such that downstream side yarn tension T2 is maintained within a fixed range is also provided. Additionally, a determining unit 45 which determines whether or not the yarn quality is satisfactory based on the detection result of an upstream side yarn tension detecting unit 24 and a downstream side yarn tension detection unit 35 is also provided.

Abstract: To enable malfunctions in the spindle drive motors of an individual-spindle-drive type textile machine in which each spindle has a rotating member (a false twisting member 5) for twisting yarn and a motor 15 for rotating the rotating member to be easily determined, a driver 30 for controlling the rotational speed of the motor 15 for each spindle and an alarm means 44 for notifying operators of a malfunction in the driver 30 are provided for each spindle.

Abstract: To provide a twisting apparatus in which one of a pair of twisting rollers t1 and t2 is a hollow rubber roller t1, while the other is a hard cylindrical roller t2 in which a rubber band t16 is installed. Twisting efficiency is improved compared to the conventional twisting roller both comprising hollow rubber rollers. Thus, by applying the present invention to a spinning apparatus for manufacturing spun yarn from a fiber set, the spinning speed of the spun yarn can be increased and the spinning range extended.

Abstract: To provide a tension control system in a false twist texturing machine for producing a doubled yarn wherein the target tension values or allowable ranges of filament yarns y1 and y2 prior to doubling can be individually set for each filament yarn and wherein based on the results of the detection of the tension of the filament yarn prior to doubling, each false twister T for the corresponding filament yarn is individually and independently controlled in such a way that the tension of each filament yarn has the set target tension value or falls within the set allowable tension range. A target tension value and an allowable tension range can be individually set for each filament yarn prior to doubling so as to accommodate the yarn's material, thickness, and structure, and the false twister can be individually and independently controlled based on the results of the detection of the tension of each filament yarn prior to doubling.

Abstract: A yarn false twisting device in which two motors 30, 40 are installed separately for each of the drive shafts 30a, 40a of each false twist application element, and each motor is controlled by a control unit C in accordance with changes in the yarn tension. The installation of separate motors for each drive shaft of each false twist application element has enabled the elimination of complex power transmission mechanisms such as an endless belt or idler, making the yarn false twisting device more compact. Furthermore, each motor is controlled so as to rotate in mutually synchronic fashion according to changes in the yarn tension, improving the overall quality of false twisted yarn.

Abstract: A false twister which nips a yarn-between crossed belts and impart twist and feed to the yarn includes a sensor for detecting an untwisting tension of the yarn portion located downstream of the belts and the untwisting tension detected by the sensor is controlled to a target value of an untwisting tension by adjusting a contact pressure between the belts or a running speed of the belts.

Abstract: Described is a new one-step process for the manufacture of twisted nylon yarn, which simultaneously spins, draws and false-twists a nylon yarn. The process operates with a spinning speed of more than 3000 m/min.

Abstract: Method and apparatus for high speed false twist texturing of yarns, which makes it possible to perform false twist texturing smoothly at a yarn speed of 1,000 m/min or higher. The number of false-twists inserted per meter of yarn is determined by Equation 1, while the yarn is false-twisted at a yarn speed satisfying Equation 2 and at a short yarn path length satisfying Equation 3: ##EQU1## wherein T is the number of false-twists inserted per meter of yarn, V is the yarn speed of false twist texturing (m/sec), L is the yarn path length from teed rollers to a false twister (m), and A is a cross sectional area of the yarn (m.sup.2), which is obtained by dividing the denier of the yarn by the density of the yarn. The false-twist texturing apparatus includes feed rollers feeding yarn to a false-twisting zone, a heating device bringing the yarn into direct contact with steam, a cooling device bringing the yarn into direct contact with water, a false twister and delivery rollers, in this order.

Abstract: A yarn false twister in which an endless belt an a first rotary member are disposed across each other to constitute a nip point at which a yarn is twisted, and a second rotary member, on which the yarn is wound after the nipping thereof so that the upstream and downstream portions of the wound yarn cross in contact with each other, is provided coaxially with the first rotary member so that the second rotary member can be rotated independently of the first rotary member.

Abstract: A method and apparatus for producing an optical multi-fiber cable element provided with a second sheathing by extruding a loose secondary sheathing around a fiber bundle and stretching the fibers a desired extra length with respect to the sheathing, the fibers being guided in such a manner that the position of the fibers varies continuously during stretching. To produce an untwisted cable element and avoid variation in the fiber length, the secondary sheathing together with its fiber bundle is twisted around its axis after the extrusion or the sheathing to vary the twisting position of the fiber bundle as the sheathing and fibers approach the stretching step.

Abstract: An operation starting method for a spinning machine of the type wherein a draft device, an air jetting nozzle and a false twisting device of the nip belt type are disposed in this order, constituted such that, in a condition of the false twisting device wherein belts are held in contact with each other at a nip point, when operation of the spinning machine is started, an air flow directed toward the false twisting device is produced on the air jetting nozzle side of the false twisting device while another air flow directed away from the false twisting device is produced on the opposite side of the false twisting device to the air jetting nozzle.

Abstract: A belt type false twisting device for a pneumatic spinning apparatus in which a fiber bundle is nipped between a pair of endless belts running in an intersecting relationship in mutually different directions to impart false twists to the fiber bundle. A pulley around which each of the endless belts extends is supported for rocking motion around a support shaft.

Abstract: A spinning apparatus comprising a drafting device, an air jet nozzle and a false twisting unit including a pair of endless belts lying in surface contact with each other at a yarn nip point, the drafting device, air jet nozzle, and false twisting unit being located in a path of yarn travel in the order named, the air jet nozzle and the false twisting unit being both movable away from the path of yarn travel, the air jet nozzle and the false twisting unit being movable to and away from each other.

Abstract: A process for producing coated, single twist glass yarns which comprises drawing a plurality of fibers formed from fibers of molten glass, applying to the fibers a sizing comprising a thermoplastic, thermosetting or photosetting composition, gathering the coated fibers into a yarn, imparting a continuous rotative twisting movement to the coated yarn and curing the coated yarn so as to polymerize and/or crosslink the sizing coating.

Abstract: Tows of fibers are wrapped around a mandrel or a central fiber core to form a cylindrical filter. At least one belt is located in position to make essentially linear contact with the cylindrical filter, and the at least one belt is driven so as to draw the tows of fiber onto and wrap the mandrel or the central fiber core and so as to move the cylindrical filter axially relative to the mandrel or with the central fiber core.

Abstract: The device according to the invention enables a false twist to be communicated to a fibrous material. The device includes two endless belts or aprons inclined with respect to each other and mounted on two pairs of rollers. According to the invention, the support rollers supporting the two aprons are mounted on the casing proper of the spindle via two support arms, one of the support arms of each pair being subjected to the action of pressure for ensuring tension of each apron and at least one of the other two support arms being mounted in articulated manner on the casing. Parallelism between the axes of the rollers is not able to be respected.

Abstract: The belt type false twister, in which a pair of pulleys with two travelling endless belts entrained thereabout are mounted fixedly, and in a position off the fiber nipping point of one endless belt there is disposed a roller for urging the said one endless belt toward the other endless belt, a linear travelling portion of the one endless belt being bent and allowed to come close to the other endless belt by the said roller to nip fibers between the closely adjacent belt portions.

Abstract: A false-twist spinning unit or apparatus comprises a first spinning disc, such as a top spinning disc and a second spinning disc, such as a bottom spinning disc rotating in opposite directions and arranged in staggered or offset relation at an inter-axis distance from one another such that friction rings thereof form a substantially rhomboid-like crossing surface. Disposed outside the friction rings are suction surfaces which engage the fibers of a sliver delivered from a nip line of an exit roll pair of a sliver feeder and convey such fibers to a yarn core line. The suction surfaces have suction apertures and sucked-off air is transported by suction nozzles coacting with the suction apertures. In operation, at the region of the nip line there is produced a false-twisted yarn core forming a spinning triangle.

Abstract: Method and apparatus for false twisting a yarn. The apparatus includes false twisting endless belts arranged to intersect each other at a nip point, a pivotally mounted arm having a yarn guide on one end thereof, a pivotally mounted bracket and adjustable cam means for maintaining the arm in separate adjusted positions wherein yarn guided by the yarn guide passes directly through the nip point of the endless belts to provide a predetermined number of false twists to the yarn and wherein the yarn is preliminarily false twisted with a twist number less than the predetermined twist number during initiation of false twisting. The method of the invention includes the steps moving the arm into a position wherein the yarn is engaged with the false twisting endless belts but not at the nip point or intersection thereof to impart initial or preliminary false twisting to the yarn and subsequently positioning the arm so that yarn guided thereby is passed through the nip point between the false twisting endless belts.

Abstract: A yarn twisting apparatus is disclosed wherein a single endless belt is entrained upon first and second roller means. At least one of the roller means is rotatably driven, so that the belt segments which extend between the roller means cross in opposing face-to-face relation at a location between the roller means and so as to define a twisting zone therebetween, and a running yarn is guided through the twisting zone so as to have twist imparted thereto. In a preferred embodiment, one of the roller means comprises a pair of individual rollers which are selectively movable to permit adjustment of their lateral separation, and which in turn permits adjustment of the crossing angle of the belt segments and thus the amount of twist imparted to the running yarn.

Abstract: An apparatus for manufacturing spun yarn comprising an air jet nozzle and a belt type twisting device, the nozzle having a fiber bundle outlet facing the twisting device and including a fiber bundle guide which is connected to the fiber bundle outlet and has a rear end located close to the intersection of the two belts defining the twisting device.

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: In a nip type false twisting apparatus for false twisting a yarn nipped between two endless belts intersecting each other and running in the opposite directions, the belt is formed of a relatively soft material which is selected to have resilient elasticity in a determined range and is used under the low contact pressure.

Abstract: Apparatus for twisting a running yarn in a textile machine comprises first and second pulleys mounted for rotation about parallel axes and an endless belt passing around their aligned peripheries so as to provide two runs each of which is twisted through 180.degree. and crosses the other run to form a nip region therewith through which the yarn is guided by yarn guides. One pulley, which may be of larger diameter than the other driven pulley, is mounted on a pivoted arm to tension the belt and/or allow for the use of differing sized belts or differing sized pulleys to alter the crossing angle of the belt and the twist level applied to the yarn.

Abstract: A method and apparatus is disclosed for producing a spun yarn composed of an inner substantially untwisted core having fibers spirally wrapped about the surface thereof. In a specifically illustrated embodiment, a yarn of staple fibers is advanced along a path of travel, while being laterally deflected by contact with each of three separate rotating discs, and so as to produce a rotating balloon which serves to open the yarn and loosen and separate fibers on the surface of the yarn. Subsequently, the advancing yarn is subjected to a false twisting operation, which serves to wrap the loosened fibers about the advancing yarn.

Abstract: A crossed belt false twist device for texturing yarn which includes two belts supported by pulleys to provide two free runs crossing at a crossing region which is nearer to one pulley in each case than to the other pulley. Longer belts can be used than heretofore known without sacrificing stability and control, thereby also reducing wear and allowing cooler running.

Abstract: A belt-operated false-twisting unit having two endless belts extending across each other and urged against each other at the intersection. The belts are drivable to run in opposite direction for nipping a yarn at the intersection to false-twist the yarn. The belts and yarn guides are set to form a parallelogrammatic region in the intersection of the belts, where the yarn is nipped and false twisted.

Abstract: A false-twist device of the type in which a pair of crossing belts engage and twist the yarn between them utilizes magnetic means to press the belts together and apply a uniform force to the yarn.

Abstract: A method and apparatus of false twisting a yarn is disclosed which utilizes a pair of endless belts mounted in crossing relation to define a twisting zone therebetween, and a pressure applying member for locally biasing at least one of the belts toward the other at the twisting zone. The yarn is advanced along a path of travel through the twisting zone, and the acute angle formed between each belt and the yarn path of travel is adjusted so as to generally correspond to the desired twist angle of the yarn in its twisted condition. Further, the speed of each belt is adjusted so as to optimize the yarn tension conditions both preceding and following the belts. To achieve an essentially slipless operation, the pressure exerted by the biasing means is adjustably controlled so that the torque exerted by the belts exceeds the natural restoring torque of the yarn.

Abstract: A yarn false twisting apparatus is disclosed which comprises two rotating twist imparting members, with a pressure applying member comprising a cylinder-piston assembly positioned to bias one member toward the other at the twisting zone. The apparatus includes an improved yarn thread-up capability which avoids breakage when the yarn is initially twisted, and which includes a pressurized air supply system for biasing the piston of the pressure applying member into operative contact with the adjacent twist imparting member, and control means for substantially reducing the pressure during yarn thread-up to thereby limit the nipping force applied to the yarn. In one embodiment, the air supply system includes a reservoir for cushioning the application of the pressure on the piston to thereby avoid the rapid application of a nipping force on the newly threaded yarn.

Abstract: A belt-type false twisting unit of the false twisting apparatus. First and second endless belts are running in directions opposite to each other to nip a yarn therebetween in the portion of intersection so that the yarn is false-twisted. A pressing roller is arranged to press a back surface of one of the belts in the portion of intersection.

Abstract: Method and apparatus to measure and adjust the tension applied to a yarn being false twisted in a belt type false twist mechanism. The fixed belt of a belt type false twister is removed and a tension measuring device is placed over the belt drive pulleys of the removed belt. The tension measuring device has a cam surface which bears against the other belt of the false twist system and automatically records the tension exerted against the cam surface by the other belt.

Abstract: An apparatus for false twisting a yarn is provided which comprises, in one embodiment, a pair of endless belts mounted for rotation to define a twisting zone between opposing friction surfaces thereof. A pressure applying member is mounted adjacent the back side of each belt for biasing the belts toward each other locally at the twisting zone so as to firmly engage the yarn passing through the twisting zone and while the friction surfaces remain in substantially non-contacting relationship with respect to each other. The pressure applying member preferably utilizes an air cushion between the member and back side of the belt to minimize friction. In another embodiment, the apparatus comprises an endless belt in association with a disc mounted for rotation about an axis disposed perpendicular to the runs of the belt, and in a further embodiment, the endless belt is associated with a roller mounted adjacent the runs of the belt.

Abstract: Apparatus including two endless aprons, one operating inside the other, the top strands thereof forming a contact zone therebetween. The aprons are angled with respect to each other preferably between 130 and 150 degrees. The yarn applied through the zone is twisted upstream of the zone with respect to a variably adjustable, insertion length stop. The yarn can be heat treated, if desired, upstream or downstream of the contact zone. Alternatively, two or more yarn strands also can be false-twisted in parallel paths through the zone and joined thereafter. By changing the length of insertion of one strand with respect to the other, alternated twist is provided to the combined yarn.

Abstract: A false-twisting system uses nipping type false-twisting apparatus designed to nip filament yarns between two intercrossing endless belts whose working surfaces are urged in the crossing region into engagement with each other.Monofilaments of a first multifilament yarn are wound fast round monofilaments of a second multi-filament yarn with combined S- and Z-twists to provide a crimped bundle of yarn closely resembling spun yarns.

Abstract: False twisting method and apparatus of nipping type for producing crimped filament yarns, comprising two flat endless belts supported, under tension, on two pairs of pulleys, respectively, so as to run in different directions relative to each other and having work surfaces of a relatively small friction coefficient and straightly extending regions defined between their mating supporting pulleys and crossing each other at a selected angle to provide a crossing zone, while being urged, with a desired pressure of contact, against each other at this crossing zone for positively nipping thereat a filament yarn to thereby twist this filament yarn, while urging this filament yarn to advance progressively from the crossing zone.

Abstract: An apparatus for setting and maintaining the nip pressure at a predetermined level in a false twister where two belts running in opposite directions are crossed in such a state that the surfaces of both the belts are contacted with each other and a yarn is nipped at this crossing point by the two belts to impart false twists to the yarn is disclosed. This nip pressure setting apparatus includes a device for compensating variations of the nip pressure where according to decrease of the nip pressure, at least one of pulleys supporting the belts is moved in a direction approaching to the opposite belt so as to increase the nip pressure and maintain it at a predetermined level.

Abstract: A false twisting apparatus comprising two endless belts crossing each other and running in opposite directions at the crossing point is disclosed, in which a yarn running through the crossing point is nipped by both the belts at the crossing point and is false-twisted by a frictional effect caused between the two belts. In this false twisting apparatus, the angle of crossing of the two endless belt is set in advance, and the apparatus may include means for detecting minute variations of this predetermined crossing angle and correcting such minute variations.