US3601969A - Method and apparatus for performing an open-end spinning operation - Google Patents

Method and apparatus for performing an open-end spinning operation Download PDF

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Publication number
US3601969A
US3601969A US794019*A US3601969DA US3601969A US 3601969 A US3601969 A US 3601969A US 3601969D A US3601969D A US 3601969DA US 3601969 A US3601969 A US 3601969A
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United States
Prior art keywords
yarn
spinning
rotor
open
spinning rotor
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US794019*A
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English (en)
Inventor
Kozo Susami
Masaaki Tabata
Masakazu Hirota
Keiichi Minami
Teiryo Kojima
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Toray Industries Inc
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Toray Industries Inc
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Priority claimed from JP1194068A external-priority patent/JPS4835617B1/ja
Priority claimed from JP1587168A external-priority patent/JPS5336054B1/ja
Priority claimed from JP2002268A external-priority patent/JPS5137974B1/ja
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/48—Piecing arrangements; Control therefor
    • D01H4/50—Piecing arrangements; Control therefor for rotor spinning

Definitions

  • SHEET 8 OF 6 UPSTREAM LENGTH OF YARN in mm ID 2b 30 4b YARN COUNTS ('s) INVENTOR.
  • the present invention relates to a method for operating yarn of the open end spinning equipment and its apparatus, more particularly relates to a method and apparatus for piecing yarn and operating a yarn on a spinning equipment utilizing airflow and centrifugal force, at the time of yarn breakage and stopping or restarting of the equipment, respectively.
  • so-called open end spinning equipment omitting a ring and a traveller has become the focus of attention in textile engineering, particularly one of the equipment utilizing air stream and centrifugal force is well known.
  • a bundle of fibers supplied from a given supply source is shredded into individual fibers separated from each other while carrying them by a high speed air stream and the individual fibers are transferred to a spinning rotor rotating at a very high speed so as to be accumulated on a inside peripheral wall of the rotor.
  • a layer of fibers accumulated on the inside peripheral wall of the rotor is continuously stripped therefrom and taken out from a central aperture formed through a bottom of the rotor while being twisted.
  • the conventional open end spinning equipments are accompanied with many drawbacks to be solved for practical utilization thereof.
  • An object of the present invention is to provide a method and apparatus for automatically retrieving the broken end of the yarn with the accumulated fibersof the rotating rotor on the open end spinning equipment without producing any yarn defects.
  • Another object of the present invention is to provide an easy and efficient method and apparatus for stopping or restarting the spinning operation of the open end spinning equipment, without dropping an end of the producing yarn from the rotor and any particular operation for piecing the yarn end with accumulated fibers in the rotor.
  • FIG. I is a skeleton side view of an embodiment of the open end spinning equipment provided with an apparatus of the present invention
  • FIGS. 2A, 2B and 2C are skeleton side views illustrating the function of a pneumatic device for supporting a broken end of the yarn at the time of restarting the spinning operation of the open end spinning equipment shown in FIG. 1,
  • FIGS. 2D, 2E and 2F are skeleton side views of another pneumatic device having the same function as the device shown in FIG. 2A,
  • FIG. 26 is a skeleton side view of the device shown in FIG. 2F at a time restarting of the spinning operation
  • FIG. 3 is a skeleton side view of another embodiment of the open end spinning equipment provided with another apparatus of the present invention
  • FIG. 4 is a perspective view of a main operating portion of the apparatus shown in FIG. 3,
  • FIG. 5 is a front view showing the main operating portion of the apparatus shown in FIG. 3,
  • FIG. 6 is a skeleton side view of a still other embodiment of the open end spinning equipment provided with a still another apparatus of the present invention
  • FIG. 7 is a perspective view showing a device for shifting a yarn path into two directions alternatively
  • FIG. 8A is a schematic side view of a device for measuring an upstream length of yarn which can be inserted straight into the spinning rotor
  • FIG. 8B is an explanatory diagram showing the upstream length of yarn measured by the device shown in FIG. 8A in connection with the yarn count
  • FIGS. 8C, 8D are schematic side views of mechanical means for inserting a yarn end into a spinning rotor of the open end spinning equipment according to the method of the present invention
  • FIGS. 9, 10A and 10B are also schematic side views of another mechanical means for inserting a yarn end into a spinning rotor of the open end spinning equipment according to the method of the present invention.
  • a bundle of fibers supplied from a given supply source is once shredded into individual fibers separated from each other during their conveying from the given supply source to the rotor and the individual fibers are accumulated upon an inside peripheral wall of the spinning rotor in a stable condition by means of the centrifugal force due to high speed rotation of the rotor.
  • a bundle of fibers 2 is supplied successively and constantly through a pair of delivery rollers la and lb from a given supply source such as a drafting equipment into a fiber feeding device 3 in a finely oriented condition of the fiber arrangement in the bundle 2.
  • a fluid stream of compressed air is supplied from an external air supply source 4 into the feeding device 3 through an electromagnetically controlled valve 5 in such a manner as to create a negative pressure within the feeding device 3.
  • This compressed air is ejected onto the bundle of fibers 2 along a conveying direction of the bundle of fibers 2 through the feeding device 3.
  • the air stream of containing fibers is ejected onto the inside peripheral wall of the spinning rotor 8, fibers are separated from the air on account of a centrifugal force due to a high speed rotation of the rotor 8 and successively accumulated on the peripheral wall while rotating around a rotating axis of the rotor 8 in a condition of cohering on the peripheral wall of the rotor 8.
  • accumulated layer of the fibers is next lengthwisely and successively stripped from the peripheral wall, taken out from the rotor 8 through the delivery pipe 7 so as to produce a spinning yarn 9 and the yarn 9 is taken up onto a package 19 by a pair of takeup rollers 10a and 10b.
  • the rebundled bundle of fibers is imparted twists by rolling along its lengthwise axis in contact with an inside wall of the rotor 8.
  • a tension detecting means comprising a limit-switch 12 located in between the rotor 8 and the takeup rollers 10a and 10b.
  • the operation of the limit-switch 12 is so designed that it provides an output signal indicative of a defective spinning operation to stop the supply of the fibers in case the yarn tension is too small or nothing, while it starts the supply of the fibers in case the yarn tension exceeds a given value.
  • the feeding device 3 is connected to the external air supply source 4 of the compressed air by way of the electromagnetic valve 5.
  • Another terminal of the electromagnetic valve 5 is connected to the delivery pipe 7 by way of a compressed air supply box 11.
  • This electromagnetic valve 5 shifts the path of the fluid stream of compressed air flowing therethrough in either direction toward the feeding device 3 or the air supply box 11 in accordance with the signal of the limit-switch 12.
  • a fluid stream yarn tension is smaller than the given, compressed air is selectively supplied to the feeding device 3 or to the compressed air supply box 11, that is, the compressed air is supplied to the feeding device 3 in case the yarn tension reaches a given value while it is supplied to the supply box 11 in case the yarn tension is smaller than the given predetermined value or the yarn is broken.
  • a pneumatic suction nozzle 14 which is connected to a blower 15 by way of a duct 16 so as to always effect a' suction on the bundle of fibers 2. Therefore. in case supplyof the compressed air to the feeding device 3 is stopped on account of yarn breakage or stop of the equipment. the bundle of fibers 2 supplied through the delivery rollers la and'lb is sucked into the suction nozzle 14.
  • the takeup rollers 10a and 10b and a winding roller 20 are so designed as to rotate into similar direction and the length of their reverse rotation is set by a timer as desired.
  • the takeup rollers 10a, 10b and the winding roller 20 are reversely rotated for a predetermined degree prior to stopping of the supply of the compressed air into the delivery pipe 7 and finally stop the supply of the compressed air into the delivery pipe 7.
  • the reverse rotation of the rollers 10a, 10b and 20 the broken or separated end portion of the spinning yarn is inserted into the rotor 8.
  • a sufficient length of the end portion of the spinning yarn is placed within the rotor 8 and the mentioned upstream end of the broken yarn does not fall down out of rotor 8 even after the whole equipment is stopped.
  • supply of the fluid stream of compressed air into the supply box 11 is utilized for keeping the broken yarn and at a preferably position in the present embodiment, this can also be positively realized by utilizing a suitable mechanical means such as a pair of nip rollers or nip belts disposed adjacent to the outlet of the delivery pipe 7.
  • a suitable mechanical means such as a pair of nip rollers or nip belts disposed adjacent to the outlet of the delivery pipe 7.
  • the constructions and features of such mechanical means will be introduced in details in the later discussion.
  • the inserted yarn end is maintained at a position near the delivery pipe 7 within the rotor 8 and does not fall down further.
  • Restarting of the equipment can be carried out principally in a manner opposite to the above-mentioned. It the first place, supply of the compressed air into the delivery pipe 7 is revived. Next, the spinning yarn 9 is taken up slightly by the rollers 10a, 10b and 20 so as to lead the upstream portion of the yarn into the delivery pipe 7 for preventing the additional twists imparting to the upstream end of the yarn positioned within the rotor, the rotation of the rotor 8 is revived up to a normal rotating speed and the rollers 10a, 10b and 20 are rotated reversely after the rotation of the rotation 8 has reached a normal speed.
  • the revived yam tension is detected by the limit-switch 12 located just downstream of the outlet of the delivery pipe 7.
  • detected signal is transmitted to the valve 5, which effects the stop of the supply of the compressed air to the delivery pipe 7 and revival of the supply of the compressed air to the feeding device 3.
  • the supply of the fibers into the rotor 8 is revived and the rollers 10a, 10b and 20 again begin to take up the spinning yarn and all of the running condition of the equip ment becomes normal.
  • the broken yarn end is inserted or introduced back into the spinning rotor 9 by a fluid stream flowing toward the rotor 8 from the supply box Ill and is connected to a layer of fibers accumulated on the peripheral wall of the rotor 8. After completion of this connection, the yarn 9 is taken up by the takeup rollers 10a, 10b as usual and the automatic yarn retrieving is completed.
  • FIGS. 2A to 2C Further detailed mechanical function of the compressed air supply box I ll used in the equipment shown in FIG. 11 is shown in FIGS. 2A to 2C.
  • the rotor 8 In the condition shown in FIG. 2A, the rotor 8 is stopped or running at a speed not enough to bring about a normal spinning condition. That is, the rotor 8 is going to start or going ro increase its rotating speed in order to begin a normal spinning operation. There is neither the supply of fibers from the feeding pipe 6 to the rotor 9 nor positive introduction of the airstream from the feeding pipe 6 to the rotor 8.
  • the upstream end of the yarn 9 is maintained within the spinning rotor 9 being blown by the compressed airstream ejected from the supply box 1111 and there is no connection between the end of the yarn 9 and the peripheral wall of the rotor 8 at this moment. If the rotation of the rotor 9 is revived and further increased in this situation, no twists can be imparted to the yarn 9 in the rotor 9. This is because of the fact that impartation of twists to the yarn 9 can be realized only by the presence of a connection of the upstream yarn end with fibers accumulated upon the inside peripheral wall of the rotor 8. 80, during the period before the rotor 9 has a rotating speed enough to carry out a normal spinning operation, the upstream end of the yarn 9 is maintained in a condition shown in FIG. 2A.
  • FIG. 2B illustrates the condition of the yarn 9 and fibers in the rotor 8 at the moment when the rotating speed of the rotor 8 has become large enough to perform a normal spinning operation.
  • the yarn tension is increased and when the yarn tension reaches a predetermined value, the limit-switch l2 actuates to stop the supply of the compressed air from the supply box. 1 ll.
  • the supply of the air stream for conveying the airstream are revived and the airstream introduced into the rotor 8 blows the upstream end of the yarn 9 towards the peripheral wall of the rotor 8.
  • Contact of the end of the yarn 9 creates connection of the yarn 9 with the layer of fibers on the peripheral wall of the rotor 9 and this results in normal impartation of twists to theyam 9.
  • the rollers Ma, 1191) and 2t) begin to rotate so as to take up the spinning yarn 9 onto the package 19.
  • FIG. 2C an internal situation of the rotor 9 during thus revived normal spinning operation is shown.
  • an air suction tube Zll is disposed to an upper end of the rotor 9.
  • the suction tube 21 works to hold the upstream end of the yarn 9 by sucking it and the contact of the yarn 9 with the peripheral wall of the rotor ti is cancelled.
  • a combined operation of the compressed air supply box Ill and the air suction tube 21 is utilized for holding the yarn end.
  • a yarn end holding tube 22 is disposed to the bottom aperture of the rotor 8 and the holding tube 22 is connected to an air supply box ll 1.
  • FIG. 2G a normal spinning condition of the example shown in FIG. 2F is shown.
  • the rotating speed of the rotor 9 is supposed to be large enough to bring about the normal spinning operation and the spinning yarn 9 is apparently con nected with layer of fibers on the peripheral wall of the rotor 8.
  • the holding tube 22 is downstream receded from inside the rotor 9, so as to enable normal spinning operation, under this situation.
  • the compressed air is ejected only into a single direction from the supply box 11. However, it can be ejected into several directions too. It is further preferably to eject the compressed air in a manner to create a vortical air stream within the delivery pipe 7.
  • the air suction tube 211 is not necessarily required to be disposed to the rotor 9 coaxially therewith. Any type of mechanical arrangement can be employed in this connection so far as it can cancel the contact of the yarn 9 with the peripheral wall of the rotor 8 by its sucking operation. If the air suction tube 211 is arranged in such a manner that it creates a vortical air flow within the rotor 8, the result will be far better with the possibility of stable spinning condition.
  • FIGS. 3 and l Another embodiment of the method and apparatus of the present invention is shown in FIGS. 3 and l.
  • the pneumatic means of the foregoing embodiment for insertion of the yarn end into the rotor is accompanied with a mechanical means for carrying out the same.
  • the mechanical arrangements and operations of the spinning rotor 8 and its related parts of the equipment are supposed to be the same with those of the first embodiment shown in FIG. 1.
  • the limit-switch 12 having a tension detecting wire 13 is related to an electromagnetic valve 29 connected to a compressed air supply source (not shown).
  • a compressed air supply source not shown.
  • the limit-switch 112 effects the supply of the compressed air to a jet device 25.
  • This jet device 25 supplies compressed air into the rotor 9 so as to hold the broken yarn end at a certain position in the rotor 8 as already mentioned.
  • this supply of the compressed air by the jet device 25 may be brought about not only at the time of the stop of the equipment but also during normal running condition thereof.
  • a pair of nip rollers 26a, 26b are disposed in between the detecting wire 13 and the takeup rollers a, 10b. Rotating direction of the nip roller 26a, 26b is opposite to that of the takeup rollers 10a, 10b and, for this reason, their nip points of the yarn is positionally differed from each other.
  • a guide lever 27 operated by a solenoid 28 is located in between the nip rollers 26a, 26b and the takeup rollers 10a, 10b.
  • This guide lever 27 selectively defines the path of the yarn 9 through the rollers 26a, 26b, 10a and 10b in accordance with signals transmitted from the limitswitch 12.
  • the guide lever 27 entrust the yarn 9 to the nip by the takeup rollers 10a, 10b and the yarn 9 is positively taken up onto the package 119.
  • the yarn 9 is transferred from the nip by the takeup rollers 10a, 10b to the nip of the nip rollers 26a, 26b by the shifting operation of the guide lever 27 and the yarn is inserted upstream into the rotor 8 by the mentioned reverse rotation of the nip rollers 26a, 26b.
  • a solenoid 30 is disposed adjacent to the package 19 so as to selectively effect the taking-up operation of the yarn 9 onto the package 19 according to the signals transmitted from the limit-switch 12.
  • both of the nip rollers 26a, 26b and the takeup rollers 10a, 10b are supported at their one ends.
  • the driving mechanisms of, for example, the takeup roller 10b and the nip roller 26b is disposed independently form the other elements and they can be engaged with the other elements, for instance, by a clutch mechanism whenever desired.
  • the delivery rollers Ia, 1b of the supply source and the rotor 8 are actuated by pushing a starting switch of the equipment.
  • Restarting of the rotor 8 usually requires a relatively long time because the rotor is run in most cases at a rotating speed up to ten thousands of revolutions per minutes.
  • the upstream length of the yarn is too short to rotate by the rotation of the rotor 8 and such a lowspeed rotation of the upstream end of yarn does not provide the yarn tension sufficient to actuate the limit-switch 12. So, the supply of the compressed air into the fiber feeding device 3 is not yet actuated and the fiber feeding operation to the rotor 8 is not yet started.
  • the bundle of fibers 2 is still conducted into the blower through through the nozzle 14.
  • the upstream length of the spinning yarn 9 differs from spindle to spindle and varies depending upon the lengths of the broken yarn ends remaining in the respective spinning rotors 8. However this variation in the upstream length of the spinning yarn 9 can be compensated at the moment when the yarn tensions of the spindles reach a definite value.
  • the yarns 9 are taken out from the respective rotors 8 and taken up onto the respective packages 19 by the combined operation of the tension detecting wires 13, guide levers 27 and the takeup rollers 10a, 10b in order to complete the restarting operation of the equipment.
  • a normal spinning operation of the spindles can be started only when the difference in the yarn tensions among spindles becomes neglected.
  • the variation of the spinning condition among the spinning condition among the spindles can effectively be minimized by the application of the method and apparatus of the present invention resulting in a production of spinning yarns having desirable and favorable retrieved portions.
  • an effective production of a spinning yarn having desirable and preferable piecing portion can be. realized by reviving the running of the fiber supplying means and the yarn taking up means after the completion of the normal running of the spinning rotor.
  • the aforementioned restarting of the equipment is realized after broken yarn ends of the respective spindles are taken up to positions wherein no rotation of the yarn ends within the rotors is effected.
  • the magnet valve 29 stops the supply of the compressed to the feeding device 3 (this means the stop of the fiber supply) and the supply of the compressed air into the jet device is revived,
  • the guidelever 27 returns from the position d to the position :1 being controlled by the solenoid 28 and it transfers the yarn 9 from the nip by the nip rollers 26a, 26b to the nip by the takeup rollers 10a, 10b.
  • the winding roller 20 comes in contact with the package 19 to take up the yarn onto the package 19.
  • the broken point of the yarn is already connected with the layer of fibers accumulated on the peripheral wall of the rotor at this moment and the twisting operation of the yarn by the equipment can be carried out in a normal condition. Therefore, even at the time of the aforementioned accidental yarn breakage, retrieving of the yarn can be carried out instantly and automatically without any trouble.
  • FIG. 6 A still other embodiment of the method and apparatus of the present invention is shown in FIG. 6. All of the elements of the equipment but the following takeup mechanism and dancer arm are arranged in a manner same with that of the foregoing embodiments.
  • the braking magnetic clutch 31 operates to stop the taking-up operation when the limit-switch I2 opens the circuit. Simultaneously with this, the nip rollers 26a, 26b come into a position to carry the yarn 9 into the rotor 8 in a manner already explained.
  • the length of the yarn 9 to be carried into the rotor 8 is controlled by the counterclockwise turning of a dancer arm 33 pivotally supported by a bearing 32 secured to the frame of the equipment. Another end of the dancer arm 33 is engaged with a switch 34 in such a manner that the switch 3 1 is effected when the dancer arm 33 is turned more than a predetermined angle.
  • the switch 34 is usually maintained so as to connect P and Q terminals. However, excessive turning of the dancer am 33 cancels this connection and produces a new connection between R and Q terminals and this always keeps the guide wire 27 in a position to lead I the yarn 9 to the nip point by the takeup rollers a, 10b.
  • a nip roller 35 is rotated into a definite direction (into clockwise direction in case of the ar-' rangement in the drawing) and is accompanied with a pair of auxiliary rollers 36, 37 under a pressure contact.
  • the auxiliary rollers 36, 37 are peripherally covered with rubber layers. Sandwiching the rollers 35, 36, 37, a pair of yarn guide disks 38a, 390 are locatedialong the yarn path.
  • the guide disks are provided with respective cutoffs for guiding the yarn formed on their peripheries and are pivotally supported by shafts 38b, 39b.
  • Rotation of the guide disks 38a, 39a is actuated by a certain external driving source (not shown) related thereto.
  • a certain external driving source not shown
  • the passing yarn 9 can be selectively transferred from a nip by the rollers 35, 36 to a nip by the rollers 35, 37 and vice versa.
  • FIGS. 8A and 8B One of the examples is shown in FIGS. 8A and 8B.
  • FIG. 8A when the length of the yarn carried upward by the nip rollers 43a, 43b through the yarn guide 40 is short, the yarn is maintained in its attitude in a condition designated as 42a.
  • This limit length of the yarn maintained its straight condition is called as upstream length and is measured using a scale -lll disposed along the yarn path.
  • FIG. 8B relations between the upstream length and the count of the yarn are graphically shown with plots.
  • the specimen yarn is supposed to be manufactured on an open end spinning equipment shown in FIG. I. It is apparent that the finer the yarn, the shorter the upstream length of the yarn and that the upstream length of the yarn does not go below 10 mm. Therefore, in case no pneumatic means for carrying the yarn end into the rotor is employed in the system,the distance between the outlet terminal of the delivery pipe 7 and the nip point of the nip rollers 43a, 43b should preferably be smaller than 10 mm.
  • Internal diameter of the delivery pipe 7 should be so designed as to permit a smooth introduction and passing of the upstream yarn without formation of fluffs.
  • the outlet terminal of the delivery pipe should preferably be converged downwardly as shown in FIG. 8D.
  • Further preferable nipping effect on the yarn can be brought about by employing a pair of apron rollers 44a, 44b as shown in FIG. 9 or two pairs of nip rollers 45a, 45b, 46a, 46b as shown in FIGS. 10A and 108. Both of the modifications are suitable for straightly introducing the upstream yarn into the rotor 18 through the pipe 7 without any trouble.
  • the length of the delivery pipe 7 as short as possible and the internal diameter of the delivery pipe 7 as large as possible.
  • the method of the present embodiment is particularly appreciated when it is used for carrying the upstream yarn of a larger thickness into the rotor because of a large quantity of pneumatic consumption is generally required for carrying such a yarn.
  • the upper nip rollers 45a, 4511 are kept in a detached relation during the normal spinning operation while they are brought into a pressure contact so as to carry the yarn into the spinning rotor 8 when the yarn breakage is detected.
  • This shift in the mechanical relation is caused by signals transmitted from the limit-switch 12 in accordance with the detected yarn breakage.
  • the yarn is released from the nipping operation by the nip rollers 46a, 46b by the operation of the shifting means such as shown in FIGS. 3 and 4.
  • An open end spinning method comprising: providing a fiber bundle of individually separated fibers; conveying said fiber bundle to an open-ended spinning zone; spinning said fibers in said open-ended spinning zone into a spun yarn and delivering the spun yarn under tension therefrom; continuously detecting the tension of the spun yarn and providing an output signal whenever the tension falls below a predetermined value indicative of a defective spinning operation; and automatically terminating the delivery of said fiber bundle to said open-ended spinning zone followed by fluidly introducing a portion of the spun yarn back into said open-ended spinning zone both in response to said output signal.
  • a method according to claim 2 including stopping said spinning step prior to said introducing step.
  • An open end spinning method comprising: pneumatically transporting a fiber bundle of individually liberated fibers to an open-ended spinning rotor having a delivery pipe connected to its downstream end; rotating said open-ended spinning rotor at a given speed to effect spinning of said fiber bundle into a twisted yarn accompanied by delivery thereof through said delivery pipe; taking up in one direction said twisted yarn delivered from said delivery pipe under tension; continuously detecting the tension of said twisted yarn passing through said delivery pipe and providing an output signal whenever the tension falls below a predetermined value indicative of a yarn separation from said. fiber bundle; and introducing the training end of the separated yarn through said delivery pipe back into said open-ended spinning rotor in response to said output signal.
  • a method according to claim 4; wherein said introducing step comprises, in the following sequence, simultaneously stopping both the transporting of said fiber bundle and the taking-up of said twisted yarn, stopping rotation of said openended spinning rotor, and providing a fluid stream effective to carry said trailing yarn end through said delivery pipe into said open-ended spinning rotor when said taking-up step is reversed, and reversing the direction of operation of said taking-up step, whereby said trailing yarn end is carried back into said open-ended spinning rotor.
  • a method according to claim 5 comprising after said reversing step, again rotating said open-ended spinning rotor to reunite said trailing yarn end with said fiber bundle, rendering ineffective said fluid stream when the tension of the reunited yarn is greater than said predetermined value, and then restarting both the transporting of said fiber bundle and the taking-up of said twisted yarn.
  • a method according to claim 6, including maintaining said trailing yarn end in said spinning rotor by entraining same in said fluid stream without contacting an interior peripheral wall of said spinning rotor during an abnormal rotation of said spinning rotor and permitting said trailing yarn end to come into contact with fibers accumulated upon said interior peripheral wall of said spinning rotor when a normal rotation of said spinning rotor is reached.
  • an open-ended, rotationally driven, spinning rotor receptive during operation of a fiber bundle of individually liberated fibers to spin the fiber bundle into a spun yarn and having a delivery pipe connected thereto through which the spun yarn is'delivered; supply means for supplying a fiber bundle of individually liberated fibers to said open-ended spinning rotor; detecting means disposed downstream from said delivery pipe for continuously detecting the tension of the spun yarn and providing an output signal whenever the yarn tension decreases below a predetermined value indicative of a yarn separation; interrupting means for interrupting the supplying of said fiber bundle to said openended spinning rotor in response to said output signal; and introducing means for fluidly introducing an end portion of the separated yarn back through said delivery pipe into said openended spinning rotor in response to said output signal.
  • said supply means includes means for developing a first fluid stream entraining therein said fiber bundle; said introducing means comprises means for developing a second fluid stream flowing through said delivery pipe into said open-ended spinning rotor efTective to entrain therein said yarn end portion and introduce same back into said open-ended spinning rotor in response to said output signal.
  • interrupting means includes valve means operable in a first mode in the absence of said output signal to effect formation of said first fluid stream while preventing formation of said second fluid stream and a second mode in response to said output signal to eflect formation of said second fluid stream while preventing formation of said first fluid stream.
  • said introducing means further comprises mechanical means for mechanically carrying said yarn end portion in an upstream direction toward said rotor simultaneously with the flowing of said second fluid stream, said mechanical positive means being disposed at a position downstream of said second fluid stream.
  • said mechanical means is a pair of relatively movable nip rollers positioned in noncontact relationship during the normal spinning operation and movable into contact with each other in response to said output signal.
  • said mechanical means comprises two pairs of rollers disposed in succession at positions below said second fluid stream, one of said pairs of rollers always contact each other and are rotating toward a takeup direction while the other pair of rollers always contact each other and are rotating toward the upstream direction which is reverse to said takeup direction, a guide lever operative to alternatively lead said yam to nip points of said pairs of rollers in accordance with said output signal of said detecting means, thereby when said detecting means detects yarn tension below a definite value, said guide lever leads said yarn to a nip point said pair of rollers rotating toward upstream direction and vice versa.
  • said mechanical means further comprises means for changing the length of the spun yarn path of travel between said pairs of rollers and said taking-up means in response to said output signal.
  • said mechanical means comprises a rotating roller and a pair of auxiliary rollers contacting at symmetrical opposite positions of said rotating roller, means for alternatively leading said yarn to a nip point of one of said auxiliary rollers with said rotating roller or a nipt point of the other auxiliary rollers with said rotating roller in accordance with said output signal of said detecting means.
  • said mechanical means is a pair of nip rollers whose direction of rotation is reversed in accordance with an output signal of said detecting means.
  • a combination according to claim 12 including a yarn end holding tube slidably and coaxially disposed within said delivery pipe in such a manner that said yarn end holding tube projects into said spinning rotor during abnormal rotation of said spinning rotor while said tube recedes into said delivery pipe during normal rotation of said spinning rotor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US794019*A 1968-02-02 1969-01-27 Method and apparatus for performing an open-end spinning operation Expired - Lifetime US3601969A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP602568 1968-02-02
JP1194068A JPS4835617B1 (de) 1968-02-26 1968-02-26
JP1286668 1968-03-01
JP1587168A JPS5336054B1 (de) 1968-03-13 1968-03-13
JP2002268A JPS5137974B1 (de) 1968-03-29 1968-03-29

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US3601969A true US3601969A (en) 1971-08-31

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US (1) US3601969A (de)
CH (1) CH517840A (de)
DE (1) DE1905163A1 (de)
FR (1) FR2001263A1 (de)
GB (1) GB1247234A (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800521A (en) * 1971-03-24 1974-04-02 Vyzk Ustav Bavlnarsky Ringless spinning machine
US3942311A (en) * 1973-07-21 1976-03-09 Fritz Stahlecker Method and apparatus for start-spinning a thread on an open-end spinning machine
US3996731A (en) * 1975-02-06 1976-12-14 Rockford Manufacturing Company Apparatus for conveying and break spinning fibers
US4020622A (en) * 1975-07-03 1977-05-03 Rieter Machine Works, Ltd. Method and apparatus for a joint start-up and stopping of the spinning positions of an open-end spinning machine
US4020621A (en) * 1973-07-29 1977-05-03 Hironori Hirai Method of and apparatus for ending the broken yarn in an open-end spinning system
US4041685A (en) * 1973-11-16 1977-08-16 Zinser Textilmaschinen Gmbh Process and apparatus for reattachment of a thread in an open-end spinning machine
US4110960A (en) * 1973-10-11 1978-09-05 Hironori Hirai Method and apparatus for piecing-up the broken yarn in an open-end spinning system
US4221110A (en) * 1977-09-14 1980-09-09 Platt Saco Lowell Limited Yarn piecing device for open-end spinning machines
US4329839A (en) * 1980-04-14 1982-05-18 Vyzkumny Ustav Bavlnarsky Method of and apparatus for starting an open-end spinning machine
EP0127017A1 (de) * 1983-05-20 1984-12-05 Maschinenfabrik Rieter Ag Vorrichtung zur Fadenbruchbehebung in einer Offen-Ende-Spinnmaschine
US4641494A (en) * 1984-12-06 1987-02-10 W. Schlafhorst & Co. Device for feeding-in a thread end into a spinning nip of a friction spinning machine
US4676060A (en) * 1985-03-20 1987-06-30 Fritz Stahlecker Open-end spinning machine with a plurality of spinning units having a movable maintenance device
US4689945A (en) * 1983-05-20 1987-09-01 Rieter Machine Works, Ltd. Open-end yarn piecer
CN103060966A (zh) * 2012-12-19 2013-04-24 芜湖富春纺织有限公司 半自动转杯纺纱机

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE759650A (fr) * 1969-12-03 1971-04-30 Schubert & Salzer Maschinen Procede et dispositif pour la filature de rubans de fibres
DE2058604B2 (de) * 1970-11-28 1977-08-25 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Verfahren und vorrichtung zum stillsetzen und wiederanfahren einer offen- end-spinnvorrichtung
US4022011A (en) * 1974-02-13 1977-05-10 Hironori Hirai Yarn piecing method for open-end spinning machine
EP0093686B1 (de) * 1982-04-30 1986-01-29 Völker, Sigrid geb. Mayer Rollo mit an einer Wandöffnung od. dgl. spannbarem flexiblem Behang, insbesondere mit einem Fliegenschutzgewebe
JPS5959925A (ja) * 1982-09-28 1984-04-05 Toyoda Autom Loom Works Ltd 結束紡績装置における糸継方法
GB2234759A (en) * 1989-10-10 1991-02-13 Hollingsworth Piecing a rotor spinning head
DE10228027B4 (de) * 2002-06-24 2006-04-13 Bos Gmbh & Co. Kg Fensterrollo mit klapperfreier Führung

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US3354631A (en) * 1964-04-20 1967-11-28 Vyzk Ustav Bavlnarsky Method and apparatus for preventing interruption of a spinning process during breakage of the spun thread
US3462936A (en) * 1965-12-01 1969-08-26 Vyzk Ustav Bavlnarsky Stop motion for open end spinning machines
US3492804A (en) * 1966-09-03 1970-02-03 Schubert & Salzer Maschinen Sensor-actuated strand clamping and strand return mechanism for spinning apparatus

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Publication number Priority date Publication date Assignee Title
US3354631A (en) * 1964-04-20 1967-11-28 Vyzk Ustav Bavlnarsky Method and apparatus for preventing interruption of a spinning process during breakage of the spun thread
US3462936A (en) * 1965-12-01 1969-08-26 Vyzk Ustav Bavlnarsky Stop motion for open end spinning machines
US3492804A (en) * 1966-09-03 1970-02-03 Schubert & Salzer Maschinen Sensor-actuated strand clamping and strand return mechanism for spinning apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800521A (en) * 1971-03-24 1974-04-02 Vyzk Ustav Bavlnarsky Ringless spinning machine
US3942311A (en) * 1973-07-21 1976-03-09 Fritz Stahlecker Method and apparatus for start-spinning a thread on an open-end spinning machine
US4020621A (en) * 1973-07-29 1977-05-03 Hironori Hirai Method of and apparatus for ending the broken yarn in an open-end spinning system
US4110960A (en) * 1973-10-11 1978-09-05 Hironori Hirai Method and apparatus for piecing-up the broken yarn in an open-end spinning system
US4041685A (en) * 1973-11-16 1977-08-16 Zinser Textilmaschinen Gmbh Process and apparatus for reattachment of a thread in an open-end spinning machine
US3996731A (en) * 1975-02-06 1976-12-14 Rockford Manufacturing Company Apparatus for conveying and break spinning fibers
US4020622A (en) * 1975-07-03 1977-05-03 Rieter Machine Works, Ltd. Method and apparatus for a joint start-up and stopping of the spinning positions of an open-end spinning machine
US4221110A (en) * 1977-09-14 1980-09-09 Platt Saco Lowell Limited Yarn piecing device for open-end spinning machines
US4329839A (en) * 1980-04-14 1982-05-18 Vyzkumny Ustav Bavlnarsky Method of and apparatus for starting an open-end spinning machine
EP0127017A1 (de) * 1983-05-20 1984-12-05 Maschinenfabrik Rieter Ag Vorrichtung zur Fadenbruchbehebung in einer Offen-Ende-Spinnmaschine
US4689945A (en) * 1983-05-20 1987-09-01 Rieter Machine Works, Ltd. Open-end yarn piecer
US4641494A (en) * 1984-12-06 1987-02-10 W. Schlafhorst & Co. Device for feeding-in a thread end into a spinning nip of a friction spinning machine
US4676060A (en) * 1985-03-20 1987-06-30 Fritz Stahlecker Open-end spinning machine with a plurality of spinning units having a movable maintenance device
CN103060966A (zh) * 2012-12-19 2013-04-24 芜湖富春纺织有限公司 半自动转杯纺纱机

Also Published As

Publication number Publication date
CH517840A (de) 1972-01-15
FR2001263A1 (de) 1969-09-26
DE1905163A1 (de) 1969-09-18
GB1247234A (en) 1971-09-22

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