DE2161642A1 - Open-end spinning machine - Google Patents

Description

Patent attorneys Dipl.-Ing. W. Scherrmann Dr.-ing. R. Rüger

73 Esslingen (Neckar), Faterlkstraße 9, PO Box 348 December 10, 1971 Telephone

Stuttgart (0711) 356539

Our reference: 35 ««

PA 7 η ski telegrams patent protection Eisllngennecksr

PLATT INTERNATIONAL LIMITED, Hartford Works, Oldham ; Lancashire / Great Britain

Open-end spinning machine

The invention relates to an open-end spinning machine with a spinning station at which the fibers form discrete fibers of a fiber collecting surface fed to a spinning rotor and withdrawn from yarn take-up means in the form of spun yarn, with a yarn cutting device, which consists of a yarn loop holding device, which holds the yarn in a loop between the spinning rotor and the yarn take-up means and from which the yarn is pulled away can be, such that it can follow a shorter path and the piecing of the yarn end in the collecting surface of the Spinning rotor is made possible, and consists of a device for generating the loop of yarn, which is a reciprocating Contains yarn gripper through which the yarn can be transferred to the shortened route.

In the known open-end spinning machines of the above-mentioned type, a reserve yarn loop is formed between the spinning rotor and the yarn take-up means and is available during the normal spinning process. In the event of a yarn breakage or a reduction in yarn tension or when the spinning process is restarted after the machine has been shut down, the reserve yarn loop is drawn together so that the yarn runs over a shorter path so that the tail end of the yarn returns and comes into contact and unification with the fibers of the fiber collection point of the spinning rotor is spun again, which is possible in the event of yarn breakage without interrupting the spinning process. * ■

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After the twine has been cut, the spare twine loop must be restored in order to prevent them from occurring in the event of any subsequent yarn breaks or reductions in yarn tension or a subsequent one Restarting the machine is available.

It has been found that the devices for producing spare yarn loops, the parts of yarn attachment devices form, insofar as they have previously become known in use for open-end spinning machines, work unsatisfactorily. task The invention is to provide a yarn tapping device of an open-end spinning machine which gives flawless results.

According to the invention, moves in an open-end spinning machine of the type mentioned at the beginning wanrtena a part of his back and forth moving forward from a retracted position in which he does not touch the yarn, in an effective position in which he grasps the yarn on the shorter path, it the yarn loop holding device feeds and hands it over to them, the yarn gripper only maintaining its effective position as long as it does Feeds yarn to the yarn loop holder while it is in Absence of yarn on the shorter route and after the yarn has been transferred to the yarn loop holding device in the retracted one Position returns.

The device for producing the yarn loop preferably contains a reciprocating slider which carries the yarn gripper attached to the slider between the retracted and the effective position is adjustable.

The open-end spinning machine, which has a plurality of spinning stations, expediently contains a sliding piece which is common to all spinning stations and which carries the yarn grippers assigned to each spinning station.

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In the drawing are two embodiments of the subject of the invention shown. Show it:

1 shows a Garnanstückvorrichtung an open-end spinning machine according to the invention in a front view,

FIG. 2 shows the device according to FIG. 1, partly in a horizontal plane Section and partly in plan view, with certain parts omitted for the sake of clarity,

3 shows the loop generating device forming part of the device according to FIGS. 1 and 2 on an enlarged scale, partly in a plan view and partly in a horizontal one Cut,

4 shows the device according to FIG. 3 in a section along the line IV-IV in FIG. 3,

FIG. 5 shows the device according to FIG. 3 in a view from the rear,

6 shows another embodiment of a yarn attachment device an open-end spinning machine according to the invention in a front view, with certain parts for the sake of clarity are omitted and

7 shows the device according to FIG. 6, partly in a plan view and partly in a horizontal cut.

As can be seen from FIGS. 1 and 2, the spun yarn becomes 1 from the fiber collecting surface of a spinning rotor (not shown) with the aid of delivery rollers 3 and 4 via a removal tube 2 deducted. Between the take-off tube 2 and the delivery rollers 3 and 4, the yarn touches the sensing arm 5 of the yarn tension sensing switch, the mode of operation of which is described below.

2 over 9 3? 7/0 9 1 8

<7on the delivery rollers 3 and 4, the spun yarn normally runs over the upper arm 6 of a fixed guide T ₁ around the hook portion 50 of a nose 8 and then around the lower arm 9 of the fixed guide 7, whereupon the yarn into one in the usual manner Winding is wound. The fact that a reserve loop is created around the nose 8 results in a longer yarn path, and the nose 8 forms the holder for the reserve loop. The fixed guide 7 and the nose 8 are expediently attached to a housing 10 which contains a device 11 for drawing together the reserve loop which is attached to the machine frame.

The device 11 for contracting the reserve loop contains an electromagnet 12, in the axis of which there is an actuating rod 13 is arranged, which is moved when the electromagnet 12 receives voltage. As can be seen from FIGS. 1 and 2, the actuating rod 13 extends outward from the left end of the electromagnet 12 and is bent at a right angle, so that it forms an arm 14 which passes through a slot 15 in the lower end of a lever 16 attached to his upper end is pivotably mounted with pins 17 and 18, which extend from him on both sides at a right angle. The pins 17 and 18 have conical free ends with which they are in correspondingly shaped seats of bearings 19 and 20 engage, which are attached to the housing 10 such that their spacing can be changed for accurate storage to ensure. On the pin 17, a block 21 is attached, which carries the lower end of a Garnablenk arm 22, which extends through a slot 23 of the housing 10 upwards. The Garnablenk arm 22 runs in front of the delivery roller 4 upwards and then downwards towards the clamping parts, which the rollers 3 and 4 form together, in such a way that a hook-shaped end 24 of the arm embraces the yarn 1.

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The operating rod 13 extends, * as shown in FIGS. 1 and 2, of the electromagnet 12 also to the right. An actuating arm 25 is attached to its right end. Between the Actuating arm 25 and the electromagnet 12, a compression spring 26 is arranged, which the actuating rod 13 to the right seeks to adjust, so that a stop 151 on the rod against the left end of the electromagnet 12 tries to apply is. The actuating arm 25 has a narrow slot through which the downward-facing extension of a tongue 27 passes, which overall has the shape of an angle lever which is pivotably mounted at 28 on the nose 8. As can be seen in FIG lets, the nose 8 has two lateral parts, between which the tongue 27 can be pivoted.

The reserve loop tightening device 11 operates when a decrease in tension occurs in the spun yarn. This is detected by the sensing arm 5, so that the switch sensing the yarn tension, the electromagnet 12 below. Tension sets. As a result, the actuator moves. The control rod 12 moves to the left (Figs. 1 and 2) with a force sufficient to overcome the bias of the spring 26. When the control rod 13 moves to the left, the arm 14 engaging the slot 15 pivots the lever 16 and the yarn deflecting arm 22 in the bearings 19 and 20 clockwise. The yarn 1 is therefore grasped by the hook-shaped end 24 of the yarn deflecting arm 22 and moved away from the nip between the delivery rollers 3 and 4, so that they immediately stop feeding the yarn through the At the same time, the actuating arm 25 of the actuating rod 13 moves to the left and pivots the tongue 27 in the clockwise direction can run back to come into contact with the fibers of Fasersammeifläche of the spinning rotor and connect with them in order to eliminate this way a yarn break. the elec The gnet 12 is only temporarily excited, and the spring 26 then returns the actuating rod 13 to its inoperative position. Here-

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at also the hook-shaped end 24 of the yarn deflecting arm 22 moves back, and the yarn returns to the nip between the delivery rollers 3 and 4, so that the delivery of spun Yarn starts again.

The contraction of the yarn loop can naturally also occur at the beginning of spinning are effected by energizing the electromagnet 12, whereby the yarn is pulled away from the nose 8, so that the Tail end of the yarn the fibers on the fiber collecting surface of the Spinning rotor can touch and unite with them.

The yarn now runs over a shortened yarn path and it is necessary to restore the reserve loop so that it is available again when the yarn tension is reduced or the spinning machine is later started after it has been shut down. This is brought about by a device for forming a new yarn loop, which is provided at each spinning station. This contains a thread gripper 136 which is arranged in a slot 30 of a slide rod 29 which is common to all spinning stations and extends over the length of the machine , running behind the device for drawing together the reserve loop. As can best be seen from FIGS. 3, 4 and 5, the thread gripper of each spinning station has a thread gripper arm 31 which is pivotably mounted in bearings 34 and 35 with pins 32 and 33 with conical ends. The thread gripping arm 31 has a thread gripping part 36 at one end and a counterweight 37 at its other end. A two-armed lever 140 is also mounted in the slot 30 of the slide rod 29 and has bearing journals 38 and 39 with conical ends which engage in bearings 40 and 41 which are arranged on opposite sides of the slot 30. One arm 42 of the two-armed lever 140 is bent in such a way that it engages in a slot 43 provided in the thread gripping arm 31, while the other arm 44 of the two-armed lever 140 extends outwardly beyond the circumference of the slide rod 29. One end of a tension spring 45 is attached to the arm 44, which endeavors to move the two-armed lever 140 against the clock; to pivot the pointer sense (Fig. 3). The other end of the train

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spring 45 is attached to a bolt 46 which is of a Screw 48 is held in a bore 47.

The device for generating the yarn loops has the following mode of operation: Moved in the illustrated embodiment the slide rod 29 continuously back and forth during the entire spinning process. When a yarn reserve loop from the nose has been pulled away and the slide rod 29 in the direction of arrow A (Fig. 2) performs a backward stroke, is located Thread gripper 136 as a result of the action of the spring 45 on the lever arm 44 in the retracted position, which is shown in FIGS 3 is indicated by dashed lines. When the yarn gripper 136 approaches the yarn 1, the lever arm 44 comes into contact with a stop 49, so that the two-armed lever 140 is with the pin 38 and 39 pivoted, whereby the force of the tension spring 145 overcomes, so that it finally assumes the position shown in Fig. 3 in solid lines. The pivoting of the arm 42 of the lever 140 has the effect, via the slot 43 in the yarn gripping arm 31, that the yarn gripping part 36 laterally out of the slide rod 29 steps out. The continued movement of the slide rod 29 in the direction of arrow A has the consequence that the protruding from it The yarn gripping part 36 passes between the guide arms 6 and 9, the yarn 1 running over the yarn gripping part 36. The slide rod 29 then reaches the end of its backward stroke after a further short path.

The slide rod 29 then begins its stroke producing the loop in the direction of arrow B (FIG. 2). When the yarn gripping part 36 passes between the guide arms 6 and 9, it grips the yarn 1 and takes it in the direction of the nose 8. Of the Lever arm 44 detaches itself from stop 49. However, the device is due to the tension of the yarn, which is sufficient to the To overcome force of the spring 45, held in place. The yarn 1 is therefore moved over the hook part 50 of the nose 8, until the slide rod 29 reaches the end of its stroke producing the loop. During the further backward stroke of the slide rod 29 the yarn is caught by the hook part 50 ″ which it

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retains and forms a reserve length of yarn which, upon a subsequent decrease in yarn tension, will cause it to contract is available.

As soon as the thread tension no longer acts on the thread looper, the thread looper returns under the action of the spring 45 in the withdrawn position. If therefore at this spinning station or at some other spinning station, the yarn tension should again decrease while the slide bar is moving is on its backward stroke, the thread gripper 36 does not hinder the complete contraction of the reserve loop of the Garnes on the shortened way. If the yarn is not completely pulled together in this way, it is naturally a flawless one Part of the thread is not possible.

When the thread gripper gets between the guide arms 6 and 9 and there is no yarn on the shortened path, d. i.e., when a yarn reserve loop has already been formed, it does this Spring 45 that the thread gripping part 36 is withdrawn into the slot 30 as soon as the lever arm 44 is released from the stop 49. Since the slide rod 29 in this case the thread gripper 36 in a position past the nose 8 in which he is outside the plane in which the yarn lies when the reserve loop is formed, the yarn gripper 36 hinders the yarn not with a possible contraction of the reserve loop.

It can be seen that the arrangement described above has the advantage that at no time during the reciprocation of the Yarn loops generating device of the thread gripper 36 reaches a position in which it when the reserve loop is drawn together could obstruct the yarn.

Although the slide rod 29 is preferably continuously moved back and forth during the spinning process, the arrangement can also be of this type be taken so that the movement of the slide rod is only initiated when a decrease in the tension of the spun Yarn is felt. Preferably, the slide rod 29 is given a greater speed during the backward stroke than

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during the loop formation stroke.

In the embodiment shown in FIGS. 6 and 7, the reserve loop of the yarn is formed in an area between the take-off tube 2 and the delivery rollers 3 and 4.

In Fig. 6, the spun yarn 1 is again with the aid of delivery rollers 3 and 4 withdrawn from the fiber collecting surface of a spinning rotor (not shown) via a removal tube 2. To Leaving the take-off tube 2, the spun yarn normally takes a path via an upper fixed guide during spinning 51, around a sheet part 52 and then over a lower one fixed guide 51 ·. The yarn then runs through the nip through which is formed by the delivery rollers 3 and 4 and is then wound up in the usual manner. During the Accordingly, during normal spinning, the yarn running around the hook portion 52 forms a reserve loop.

Referring to Fig. 7, the sheet portion 52 is at one end of a yarn holding arm 53, which represents part of a thread loop holder 54. The yarn holding arm 53 is at 55 on one The carrier is pivotably mounted and carries a counterweight 57 on its end facing away from the hook part 52 at 59 a two-armed lever 58 pivotally mounted, one arm 60 of which is bent in such a way that it fits into a slot 61 of the yarn holding arm 53 intervenes. The other arm 62 extends outward and has a function to be described below. On him engages one end of a tension spring 63, the other; End is connected to a regulating screw 64, with the help of which. the tension of the tension spring 63 can be changed. The spring 63 ι endeavors to reverse the two-armed lever 58 to the watch:

to pivot clockwise, with the result that the yarn holding: arm 53 is pivoted in the clockwise direction. During the normal spinning process, however, the tension in the yarn is sufficient to overcome the force of the spring 63, and the yarn holding arm 53 consequently remains in the position shown in FIG. If the thread tension is reduced or the thread breaks,

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- OK -

the two-armed lever 58 is pivoted counterclockwise under the action of the spring 63. The end of the arm 6O slides down in the slot 61 and pivot the arm 53 in the clockwise direction. The yarn is released from the hook part 52 so that its path is shortened and the tail end of the yarn can return to the fibers on the fiber collecting surface of the spinning rotor and to unite with them, so that the yarn breakage is eliminated in this way.

The yarn then takes a shortened path between the guides 51 and 51 ', whereupon, however, a reserve loop must be formed again, which can be pulled together when the yarn tension is subsequently reduced. This is effected by a thread gripper 136 which is arranged in a slot 30 of a slide rod 29 which is common to all spinning stations and which extends over the length of the machine. The thread gripper 136 has the same mode of operation as that which is contained in the exemplary embodiment according to FIGS. 1-4. When the thread gripper 136 approaches the yarn 1 in the direction of arrow A, it is in the retracted position, which is shown in Fig. 7 in solid lines, until the lever arm 44 runs against a stop 49, which has the consequence that the thread gripping part 36 laterally emerges from the slide rod 29 _: occurs. During the stroke producing the loop, the slide rod moves in the direction of arrow B in FIG. 7. Since the thread looper;

j 36 here between the fixed guides 51 and 51 'through; goes, it grips the yarn and takes it in the direction of the yarn holding arm 53. The lever arm 44 releases from the stop 49, however, the thread gripper is held in the operative position, since the thread tension is sufficient to overcome the force of the spring 45.

The thread loop holder 54 is here in the retracted position, which is indicated in FIG. 7 in dashed lines. However, the hook portion 52 of the yarn holding arm 53 must

- 11 -,

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return to a position in which it grips the yarn. This is caused by a switching element 65 that is attached to the back and forth going slide rod 29 is attached by touching the lever arm 62 and pivoting the lever 58 in the clockwise direction, which has the consequence that the yarn holding arm 53 is pivoted about the point 55 and the hook part 52 is for receiving the Yarn's effective position is reached. The yarn is passed lightly over the sheet portion 52 until the slide bar reaches the end of the die Yarn loop forming stroke reached. On the backward stroke of the slide rod 29 in the direction of arrow A, the yarn is from the sheet portion 52 is detected, and the tension in the thread is sufficient to hold the thread looper in the position shown in solid lines To hold position when the switching element 65 is released from the lever arm 62. In this way there is a reserve loop of the yarn Puckering available when the yarn tension in the following time decreases or the thread breaks. As soon as the thread gripping part 36 is no longer under the effect of the thread tension, the returns Yarn gripper 136 under the action of the spring 45 back into the retracted position, as shown in FIG. 7 in solid lines is shown.

In the embodiment described above, it is important

make sure the speed of the loop of yarn

generating stroke is only so great that the fineness of the yarn is not affected.

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2Ü9827 / 0918

Claims (1)

Claims 1. Open-end spinning machine with a spinning station at which the fibers form discrete fibers of a fiber saramel surface of a spinning rotor fed and in the form of spun yarn from yarn take-up means be removed with a yarn attachment device consisting of a yarn loop holding device that holds the yarn between the spinning rotor and the yarn take-up means in a loop 'and from which the yarn can be pulled away so that it can follow a shorter path and the piecing of the yarn end in the collecting area of the spinning rotor is made possible, and off a device for generating the yarn loop, which contains a reciprocating yarn gripper through which the Yarn can be transferred to the shortened path, characterized in that the yarn gripper (136) during a part its to-and-fro movement emerges from a withdrawn Position in which he does not touch the yarn, moves into an effective position in which he moves the yarn on the shorter path detected, it promotes to the yarn loop holding device (8 or 53) and transfers it to this, the yarn gripper (136) its only maintains effective position as long as it holds the yarn of the yarn loop holding device (8 or 53) feeds, while in the absence of yarn on the shorter path and after transferring the Yarn returns to the yarn loop holding device (8 or 53) in the retracted position. 2. Open-end spinning machine according to claim 1, characterized in that that the device for producing the yarn loop contains a reciprocating slide (29) which the yarn gripper (136) which is adjustable on the slide (29) between the retracted and the operative position. - 13 - 209827/0918 3. Open-end spinning machine according to claim 2, characterized in that a yarn gripper arm (31) of the yarn gripper (136) cooperates with a lever (140) in such a way that it holds the yarn gripper arm (31) in the retracted position in a first pivot position or allows this position to be taken while in a second pivoted position it holds the yarn gripping arm (31) in the operative position, with a fixed stop (49) against which the lever (140) during the relevant part of the reciprocating Movement of the yarn gripper (136) starts _f and: moves it from the first pivot position into the second pivot position. 4. Open-end spinning machine according to claim 3, characterized in that that the yarn gripping arm (31) by a spring (45) in the retracted Position is held, which acts on the lever (140). 5. Open-end spinning machine according to claim 4, characterized in that that the spring force ^ the arm 31 on the yarn gripper in the retracted Position acts, and the yarn tension, which is transferred to the Garngreifa £ m (31), have such a size that the yarn gripping arm (31) of the yarn during the movement in which he feeds the yarn to the yarn loop holding device (8, 53), is held in the operative position. 6. Open-end spinning machine according to one of claims 2 to 5, characterized in that the device for generating the yarn loop includes control means responsive to a condition in which the yarn has to be transferred on the shorter path and then the back and forth movement of the slide (29) let begin. 7. Open-end spinning machine according to one of claims 1 to 6, characterized in that the yarn loop holding device has a fixed twine holder (8) around which the twine loop wraps, and furthermore has a twine stripping tongue (27). - 14 209827/0918 3. Open-end spinning machine according to claim 7, characterized in that that the yarn loop holding device is assigned control means are that after a predetermined signal, the wiper tongue Press (27). '9. Open-end spinning machine according to claim 8 / characterized in, that the control means consist of an electromagnet (12) which acts on the Garnabstreifzunge (27) so that this grips the twine and strips it off the fixed twine holder (8) 10. Open-end spinning machine according to claim 8 or 9, characterized in that that the yarn loop holding device (8 or 53) is assigned a Garnablenkarm (22), which when responding to Control means (12) responding to the signal causing the loop to contract, moving the yarn out of the way through the nip the delivery rollers (3, 4) of the spinning machine passes through, deflects on a path in which it from the nip of the Delivery rollers (3, 4) is free. 11. Open-end spinning machine according to claim 8, 9 or 10, characterized in that the yarn loop holding device (8 or 53) a yarn tension sensor is assigned, which is responsive to a decrease in the yarn tension and the generation of the signal for The thread loop is pulled together. 12. Open-end spinning machine according to one of claims 1 to 6, characterized in that the yarn loop holding device (54) has a yarn holding arm (53) which between a position in which it holds the yarn loop and a position in which he releases the yarn, is pivotable, he in the latter Position is held by a spring (63), while the tension of the yarn from the yarn holding arm (53) in the Loop is held, is sufficient during the normal spinning process to the yarn holding arm (53) in the yarn holding position hold, while a predetermined decrease in the yarn tension the movement of the yarn holding arm (53) in the. Position allows in which he releases the yarn. 209827/0918 - 15 - 13. Open-end spinning machine according to claim l2, insofar as this assigned to one of claims 2 to 6, characterized / that the yarn loop holding device {54) is a switching element (65) is assigned / that sits on the slide (29) and the yarn holding arm (53) from the position in which it releases the yarn ■ in the position in which he holds the thread loop during that Part of the path of the slide (29) pivoted on which the yarn from the yarn gripper (31) to the yarn holding arm (53) is passed. 14. Open-end spinning machine according to claim 2, or one of the Claims 3 to 13, insofar as these are assigned to Claim 2, characterized in that the one having several spinning positions Open-end spinning machine contains a slider (29) which is common to all spinning stations and which is assigned to each spinning station Yarn gripper (136) carries. 209827/0918 Blank page