CN112093587A

CN112093587A - Yarn connecting device for knotless connection of two yarn ends

Info

Publication number: CN112093587A
Application number: CN202010547143.XA
Authority: CN
Inventors: 亚历山大·马克思; T·R·亚当斯; K·洛伦茨; S·本特尔
Original assignee: Saurer Spinning Solutions & CoKg GmbH
Current assignee: Saurer Spinning Solutions & CoKg GmbH
Priority date: 2019-06-18
Filing date: 2020-06-16
Publication date: 2020-12-18
Anticipated expiration: 2040-06-16
Also published as: CN112093587B; JP2020203796A; DE102019116488A1

Abstract

The invention relates to a yarn connecting device for the knotless connection of two yarn ends, comprising a friction disk for applying a mechanical action to the yarn ends to be connected, which is mounted so as to be rotatable and displaceable relative to each other and is provided with a plurality of yarn severing means for respectively cutting the yarn. One of the friction disks is of multiple-part form and has an intermediate part, an inner ring and an outer ring, which are mounted so as to be axially displaceable, so that the other friction disks have at least an intermediate part and a ring, a first drive device for axially moving at least the intermediate part, the inner ring and/or the outer ring of the multiple-part friction disk is provided, a control device is associated with the first drive device, a second drive device for rotating the inner ring, the outer ring and/or the ring is provided, a control device is associated with the second drive device, a third drive device for operating the yarn breaking device is provided, a control device is associated with the third drive device, and the control devices of the drive devices can be connected to a central control unit by means of which the movement process of the drive device can be centrally set.

Description

Yarn connecting device for knotless connection of two yarn ends

Technical Field

The invention relates to a yarn connecting device and a textile machine for manufacturing winding bobbins, comprising the yarn connecting device.

Background

In the textile industry, yarn joining devices have long been known in the prior art and are described in a large number of patent applications. The yarn joining device produces almost the same yarn joining as the yarn by the swirling or rotation of the two yarn ends. Such a yarn connection is an important criterion for the quality of the yarn and should not only have a strength similar to that of the yarn, but also have an appearance as similar as possible to that of the yarn.

When a thread break occurs in the textile machine producing the wound bobbin during the process or when a defined cleaning cut is carried out at one of the stations of the textile machine due to a thread defect, the thread end of the broken thread is first withdrawn by means of a special air flow device in the region of the thread connecting or joining device. The suction nozzle then withdraws the so-called upper thread from the cross-wound bobbin and, if necessary, after removing the thread defects, inserts it into the thread connecting device. Correspondingly, a so-called doff, for example from a feed bobbin located in the unwinding position, is also inserted into the yarn connecting device by means of a nipper tube which can be subjected to underpressure.

The principle of mechanical splicing is that the upper and lower yarns are first untwisted (twisted open) and then twisted/twisted again by rotating them in opposite directions via friction discs, wherein after untwisting the yarn ends are shortened such that they overlap and engage each other only in a limited area.

EP0140412a1 discloses a yarn connecting device comprising two friction discs which can be driven towards each other for applying a mechanical action to two yarn ends. The yarn ends are first positioned between the friction discs, untwisted and torn (tear) at the beginning of the yarn joining process. In order to locally limit and bundle the yarn ends which are now in the form of brushes and no longer have a twist and in which the fibers are approximately parallel to one another, the yarn ends are bundled by means of a so-called reed and subsequently joined to one another, i.e. twisted together.

The yarn connecting device according to EP0140412a1 comprises two friction discs, each comprising an untwisting-twist ring assembly and a twist assembly. In addition, the yarn connecting device has an adjustable cam mechanism which activates untwisting and twisting separately from each other, and a spacer which at least temporarily holds the friction disk surfaces at a desired distance. In order to tear or rip the yarns, means are provided for gripping and tearing the respective yarns, including movable portions.

Since the movement and coordination of the operating mechanism in the thread connecting device is effected by a cam assembly driven by an electric motor or by a cam drive, the entire work required in the piecing cycle is limited to one complete revolution of the cam disk shaft. Such designs on the one hand require high construction costs and on the other hand are inflexible, such as for example with regard to various different yarn requirements or changes in some process parameters. Repetition of individual operations/jobs in one piecing cycle is excluded.

Disclosure of Invention

A first aspect of the invention therefore relates to a thread connecting device for the knotless connection of two thread ends, having friction discs for applying a mechanical action to the thread ends to be connected, which friction discs are mounted so as to be rotatable and displaceable relative to one another and are provided with a plurality of thread severing means for respectively severing the thread.

The friction discs are characterized in that one of the friction discs is of multi-piece construction and has an intermediate portion, an inner ring and an outer ring, which are axially movably mounted, and the other friction disk having at least an intermediate portion and a ring, first drive means being provided for axially moving at least the intermediate portion, the inner ring and/or the outer ring of the multi-piece friction disk, wherein the first drive device is associated with a control device, a second drive device for rotating the inner ring, the outer ring and/or the rings is provided, the second drive device is associated with a control device, a third drive device for operating the yarn breaking device is provided, the third drive device is associated with a control device, and the control devices of the drive device can be connected to a central control unit, by means of which the course of movement of the drive device can be centrally set.

If one of the friction disks is multi-part and the parts are mounted so as to be axially displaceable, untwisting of the thread ends and twisting/turning of the thread are reliably ensured. By means of the axially displaceable intermediate part of the friction disc, a secure clamping of the thread during tearing is also ensured. By designing the at least one friction disc in this way, the parts may be moved closer to or in contact with the second friction disc, either individually or at least partially in common. The second friction disk has at least an intermediate part and a ring, wherein the friction disk can be one-piece or multi-piece. It is also conceivable within the scope of the invention for the two friction disks to be designed in multiple parts and/or to be mounted so as to be axially displaceable.

A first drive device is provided, which positions the individual components of the multi-part friction disk at least in the axial direction. If the two friction discs are axially movably mounted, a first drive means may be used to drive the two friction discs. Depending on the process steps, the first drive means positions portions of the multi-piece friction disks individually or together such that the friction disks move toward each other or have a gap therebetween. At the beginning of the joining process, for example, the outer ring is moved closer to the ring, the intermediate part is moved axially at a later point in time so that it moves closer to the intermediate part of the other friction disk and temporarily releases the outer ring from contact with the ring. The inner and outer rings are moved axially together in order to finally twist the ends of the yarn around each other.

The second drive means of the yarn connecting device drives in rotation the inner and outer rings of the multi-piece friction disc and the ring of the second friction disc on the one hand. The two friction disks are usually driven toward one another when they have been moved toward one another by the first drive device and are therefore in effective engagement with one another. For untwisting the upper and lower yarns, the outer and ring are driven in opposite directions, while for twisting the yarn ends, the inner and outer ring and the ring are driven.

Finally, the yarn connecting device is provided with a third drive device which drives a plurality of, and usually two, yarn severing mechanisms. After the upper and lower yarns are freed from their twist, the middle portion clamps the two yarns and the yarn severing mechanism severs the two yarns. In this way, it is ensured that the two thread ends overlap only in a limited area, so that the fibers of the two thread ends can twist together without a thicker end than the remaining threads.

All three drives are assigned a control device, which is either part of the respective drive or can be arranged externally. In the simplest case, the control device is formed by a workstation computer, since it is usually present at each workstation. The control device can also be connected to a central control unit, so that the movement of the individual drives is controlled by the central control unit. In this case, it is conceivable within the scope of the invention that the central control unit can be integrated in the respective textile machine, be formed by a peripheral computer or the like associated with the textile machine, or also be formed by a mobile terminal such as a smartphone or a tablet computer.

By eliminating the cam mechanism and realizing three separate drives, which are formed, for example, by stepping motors, different yarn requirements and yarn properties can be taken into account. However, the yarn joining device according to the invention can also react flexibly to different events within one joining cycle. It is also possible to carry out a single process step or a repetition of a plurality of process steps in one piecing cycle. The variation of the individual process parameters can be carried out by the central control unit without manual intervention at the yarn joining device.

The yarn connecting device according to the invention with three drives that can be controlled independently of one another has the advantage that with the yarn connecting device thus formed, all types of yarn are prepared as intended and can subsequently be spliced almost as well as the yarn, wherein it is ensured that the yarn to be connected is always securely fixed during the entire splicing process.

Connecting the control device of the drive device to the central control unit also has the advantage that the individual drive devices of the various functional components of the yarn connecting device can be readjusted quickly and accurately by the central control unit as required, for example, when a batch change is to be carried out on the textile machine. That is, by smoothly optimizing the adjustment of the yarn connecting device, a spliced connection is easily established which not only has an almost identical appearance as the yarn, i.e. whose strength also substantially corresponds to the "normal" yarn.

In an advantageous embodiment, the axial spacing of the friction disks during the application of the thread can be set as desired by the first drive.

If the inner ring and/or the outer ring of the multi-part friction disk can be flexibly positioned as desired not only in the moving-in or non-moving-in sense, but also with respect to the axial distance, then distinct required profiles can be taken into account. The individual axial distances during the action on the yarn can be selected, for example, for a spun yarn or a roving yarn. The friction disk can be variably positioned or axially moved closer even during one piecing cycle. The first drive device can be controlled by the central control unit.

The angle of rotation of the friction disk or of the inner ring, outer ring and/or ring can preferably be set as desired by means of the second drive.

Friction discs are used only within a limited angular range, depending on the angular range over which the friction discs rotate relative to each other. By separate drive means, the rotatably mounted portions of the friction disc can be driven individually over a smaller or larger angular range as required. For example, if yarns with very high twist are processed, the angular range may be a greater value than when yarns with relatively low twist are processed. The second drive device can be controlled by the central control unit.

In a preferred design, these yarn severing mechanisms are designed as reversibly driven winding mechanisms (thread winders) with a slotted head.

When the upper yarn and the lower yarn are positioned between the friction disks, the yarn is guided for subsequent yarn cutting by a yarn feeding mechanism which ensures that the yarn end is normally inserted into the yarn connecting device and also by the yarn cutting mechanism. By means of such a thread breaking mechanism in the form of a winding mechanism, which is located in the thread running direction before and after the friction disc, the upper and lower threads occurring after untwisting can be reliably cut.

The upper thread is guided through the slot-shaped head of the lower winding mechanism and the lower thread is guided through the slot-shaped head of the upper winding mechanism. After the two threads have been untwisted, the upper thread and the lower thread are cut back by rotating the shaft-like winding means about their respective longitudinal axes and thereby winding the respective thread onto the winding means. In this way, it is ensured that the two thread ends overlap only in a limited region, so that the fibers of the two thread ends can twist with one another, but no thicker ends than the remaining threads occur. Since the upper yarn and the lower yarn are wound around the peripheral surfaces of the respective shaft members of the winding mechanism, the winding mechanism has almost unlimited acceptance and pre-stretching capabilities, so that the highly elastic yarn can be torn safely and reliably. After the yarn connection has been made, the winding mechanism is driven in reverse and thus releases two yarn remnants, which are then sucked and removed by the suction nozzle or the nipper tube.

A further advantage of the design of the thread severing device according to the invention as a winding device with a slotted head is that the upper thread and/or the lower thread can be subjected to a pre-tensioning force before the thread connection is formed, as a result of which the untwisting properties, the tensile strength properties and/or the thread connection to be formed are influenced.

To this end, the upper and/or lower yarn is wound at least to some extent onto the respective winding mechanism by rotating the winding mechanism after it is seated between the friction discs and is inserted into the head of the winding mechanism, and also before the friction discs or friction disc portions are moved towards each other. By means of the tensile force thus exerted on the respective yarn, the yarn processing and thus the joint connection to be formed can be influenced. When the upper and/or lower yarn with tension is located between the friction discs, at least a portion of the friction discs are moved closer to each other, the yarn is freed from its twist and is cut short in order to subsequently connect the ends of the yarn to each other.

The rotation of the winding mechanism can preferably be regulated by the third drive device.

Since not only the speed at which the winding mechanism rotates but also the number of revolutions performed by the winding mechanism can be adjusted by the central control unit, it is possible to treat distinct yarns individually with the winding mechanism as desired. The third drive device can be controlled by the central control unit.

The third drive is also used to check the tensile strength of the yarn after the yarn connection is complete. For this purpose, the yarn is fed to the winding mechanism together with the just formed yarn splice and drafted. The joint is now between the two winding mechanisms. By applying a defined motor current, the joint is subjected to a corresponding force. If the joint is subjected to the applied pulling force/force, the motor stop can be determined by the driver electronics of the end stage of the stepper motor and the information can be evaluated accordingly. According to this method, it is also conceivable to determine the maximum joint strength.

The yarn connecting device according to the invention can also respond flexibly to different requirements within one piecing cycle. Repetition of the tearing process in one piecing cycle can also be achieved. When, for example, the elastic thread is not torn at the first attempt, it is conceivable within the scope of the invention for the winding mechanism to be rotated again in order to wind more thread and thus perform a re-tearing process.

In a further preferred embodiment, the central control unit is a central control unit of a textile machine that produces wound bobbins.

The central control unit is present in almost every textile machine that produces a winding bobbin and is therefore suitable for functioning as a central control unit.

A second aspect of the invention therefore relates to a textile machine for producing wound bobbins, having a thread connecting device for the knotless connection of two thread ends.

The textile machine for producing wound bobbins is characterized in that at least one connecting device is formed according to one of the embodiments described above.

To this end, the advantages and effects described in connection therewith can be achieved. The textile machine with at least one yarn connecting device designed in this way can flexibly process very different yarns according to the needs, wherein the optimal process parameters can be selected, adjusted and realized. By controlling these drives by a central control unit, manual adjustment at the yarn joining device itself is dispensed with.

Drawings

Other features and advantages of the invention will be apparent from the following description of preferred embodiments of the invention, from the figures and drawings which show important details of the invention, and from the claims. These features can be implemented in a preferred embodiment of the present invention alone or in any combination of a plurality thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a side view of a workstation of a winding machine with a yarn connecting device;

FIG. 2 shows a schematic view of a yarn connecting device having a friction disc constructed in accordance with the present invention;

FIG. 3 shows a schematic view of the first drive arrangement in an installed position;

FIG. 4 shows a schematic view of the second drive arrangement in an installed position; and

fig. 5 shows a schematic view of the third drive in the mounted position.

List of reference numerals

Textile machine for producing wound bobbins

2 station

3 bobbin conveying system

4 cop supply section

5 memory segment

6 transverse conveying section

7 bobbin feedback section

8 conveying disc

9 spinning bobbin

10 yarn connecting device

11 casing

12 suction nozzle

13 first pivot axis

14 bobbin driving roller

15 Cross-wound bobbin

16 friction disk

17 intermediate part

18 inner ring

19 outer ring

20 second pivot axis

21 cross-wound bobbin conveying device

22 third pivot axis

23 Ring

24 winding device

25-clamp bobbin

26 gap

27 guide mechanism

28 bobbin creel

29 station computer

30 yarn conveying mechanism

31 upper yarn

32 run yarn

33 yarn breaking mechanism

34 first driving device

35 sector gear

36 coupling rod

37 lifting transmission mechanism

38 second coupling rod

39 second drive device

40 driving mechanism

41 coupling shaft

42 third drive device

43 drive mechanism

44 winding mechanism

45 head

46 bus

47 Central control Unit

Detailed Description

Fig. 1 shows a schematic representation of a textile machine for producing wound bobbins, in the exemplary embodiment a winding machine, generally designated by reference numeral 1, in a front view.

Such a winding machine 1 usually has a plurality of identical stations 2 between its end frames (not shown), at which spinning bobbins 9, for example produced on a ring spinning machine, are rewound into large cross-wound bobbins 15 as is known and therefore not described in detail.

After the production, the cross-wound bobbins 15 are transferred by means of an automatically operating service unit, preferably a (not shown) cross-wound bobbin changer, to a cross-wound bobbin conveyor 21 along the machine length and are conveyed to a bobbin loading station or the like located on the machine end side.

Such a winding machine 1 usually also has a logistics device in the form of a bobbin transport system 3 in which the spinning bobbins 9 or empty bobbins circulate in a vertical orientation on a conveyor plate 8. Fig. 1 shows only the cop supply section 4, the storage section 5, which can be driven in the forward and reverse direction, the cross feed section 6 leading to the working position 2 and the bobbin return section 7 of the bobbin transport system 3.

Furthermore, such a winding machine 1 is generally provided (not shown) with a central control unit 47, which is connected via a machine bus 46 not only to the station computers 29 of the several stations 2, but also to the control of the service units.

AS already indicated, the supplied spinning bobbin 9 is rewound in the unwinding position AS (the unwinding position is located in the region of the transverse transport section 6 at the station 2) to form a large cross-wound bobbin 15.

These stations 2 are known for this purpose and are therefore provided with different mechanisms, only shown, which ensure the proper functioning of the stations. Such as a suction nozzle 12 for actuating an upper thread 31, which can rotate in a limited manner about a first pivot axis 13, a gripper tube 25 for actuating a lower thread 32, which can rotate about a second pivot axis 20, and a thread connecting device 10, into which the upper thread 31 and the lower thread 32 are inserted in order to carry out a thread connecting process.

Such a station 2 is generally also provided with other mechanisms, not shown in detail, such as a yarn tensioner, a clearer, a waxing device, a yarn breaking device, a yarn tension sensor and a doffing sensor.

The winding of the cross-wound bobbin 15 takes place on a winding device 24. Such a winding device 24 is provided in particular with a creel 28 which is mounted movably about the third pivot axis 22 and has a mechanism for rotatably holding the cross-wound bobbins. During the winding process, the cross-wound bobbin 15, which is mounted freely rotatably in the bobbin creel 28, rests with its surface against the bobbin drive roller 14 and is carried along by it frictionally.

The yarn connecting device 10 has three separate

reversible drives

34, 39 and 42.

The first drive 34, the second drive 39 and the third drive 42, which are preferably designed in the form of stepping motors, are controlled as required by a station computer 29, which is connected, for example, via a bus 37 to a central control unit 38, such as, for example, a central control unit of the textile machine 1.

That is, in this embodiment, the regulating parameters of all the

drive devices

34, 39 and 42 can be jointly regulated by a central control unit of the textile machine 1.

Fig. 2 shows the yarn connecting device 10 with the housing 11 in a schematic view, so that one of the friction disks 16, the region between the friction disks 16 and the regions above and below the friction disks 16 can be seen.

For connecting the two thread ends, i.e. for connecting the upper thread 31 and the lower thread 32, the upper thread 31 is positioned between the friction disks 16 by means of the suction nozzle 12 and the lower thread 32 by means of the clamping tube 25. For this purpose, the thread is guided by the thread delivery mechanism 30 to ensure that the thread end is properly inserted into the thread connecting device 10 and by the thread cutting mechanism 33 to subsequently cut the thread.

In the simplest design of the yarn connecting device 10, only parts of the multi-piece friction disc 16 are mounted axially displaceable, while the other friction discs 16 are mounted fixedly. In principle, however, the two friction disks 16 can also be mounted so as to be axially displaceable. In this embodiment, the intermediate portion 17, the inner ring 18, and the outer ring 19 of the multi-piece friction disc 16 are individually axially movable.

After the upper 31 and lower 32 yarns are positioned between the friction discs 16, the outer ring 19 is moved closer to the ring 23 of the opposite friction disc 16 so that the yarns are directly between the friction discs 16. The two friction discs 16 are driven in opposite rotational directions to untwist or shed the upper yarn 31 and the lower yarn 32.

Next, the movable intermediate portion 17 is moved closer to the intermediate portion 17 of the opposing friction disk 16 to sandwich the upper yarn 31 and the lower yarn 32. Temporarily releasing the outer ring 19 from contact with the ring 23, during which the yarn breaking mechanism 33 tears or cuts the upper yarn 31 and the lower yarn 32. The residual yarn located in the yarn breaking mechanism 33 is sucked and removed by the suction nozzle 12 and the nipper bobbin 25. The thread ends of the upper thread 31 and the lower thread 32 remain between the friction discs 16, which are freed from their twist and thus form a brush-like thread end, respectively, in which the individual fibers are located.

After truncation, both the inner ring 18 and the outer ring 19 are moved axially and are moved closer to the opposing friction disc 16 having its middle portion 17 and ring 23. The two friction disks 16 have a plurality of recesses 26, into which guide means 27 can be inserted. The guide means 27 serve to keep the approximately parallel fiber orientation after the yarn twist has been eliminated and the upper yarn 31 and the lower yarn 32 have been cut short, and the brush-like yarn ends are centered or bundled so that the yarn end fibers can be twisted with one another by renewed counter-rotation of the friction disc 16.

Before the friction disc 16 is driven again in opposite rotational directions to twist the thread ends or twists of the upper 31 and lower 32 yarns, the intermediate portion 17 is moved axially out of contact with the opposite intermediate portion 17.

Fig. 3 shows a schematic view of the first drive means in the mounted position.

The first drive 34 is connected to a coupling rod 36 via a Segment gear 35(Segment wheel). The coupling rod 36 is also connected to and drives the rotation of the lifting gear 37. The lifting gear 37 rotates and the axial positioning of the friction discs 16 or parts of the friction discs 16 is achieved by abutment against the lifting cam.

If the two friction discs 16 are mounted axially movably, only the second coupling rod 38 is shown in fig. 2, which axially positions the second friction discs via a further (not shown) lifting cam mechanism. For the sake of overview, fig. 3 shows only the second coupling rod 38, to which other lifting cam drives (not shown) can be connected.

That is, the intermediate portion 17, the inner ring 18, the outer ring 19 of the multi-piece friction disc 16 and/or the intermediate portion 17 and the ring 23 of the other friction disc 16 are moved in a prescribed axial direction by the first drive means 34.

The yarn connecting device 10 according to the invention also has a second drive 39, which is shown schematically in fig. 4 in the mounted position.

The second drive means 39 drives the friction disc 16 or the ring 23 via a transmission 40. The opposite second friction disk or inner ring 18 and the outer ring 19 are driven in opposite directions by a coupling shaft 41, by means of which a further transmission gear, not shown, can be driven by the second drive means 39.

Fig. 5 shows a schematic view of the winding mechanism 44 of the present invention in an installed position.

The drive 42 for the winding means 44 drives the winding means 44 via a gear 43, which each have a slot head 45 into which one

yarn

31, 32 to be joined can be inserted.

That is, in order to form a yarn connection, the upper yarn 31 and the lower yarn 32, which are oriented parallel to each other, are seated between the friction discs 16 of the yarn connecting device 10 and are simultaneously separately inserted into the head 45 of the winding mechanism 44.

Subsequently, the first drive device 34 is put into operation, and the outer ring 19 of the multi-piece friction disc 16 is axially moved via the lift cam transmission 37, so that the outer ring 19 moves closer to the ring 23 of the opposite friction disc 16.

In a next step, the outer ring 19 and the ring 23 are rotated in opposite directions by the second drive 39 and the transmission 40, while the upper yarn 31 and the lower yarn 32 are untwisted, so that they are substantially freed from their yarn twist.

In order to clamp the upper thread 31 and the lower thread 32, the multi-piece friction disc 16 is moved closer to the intermediate portion 17 of the opposite friction disc 16 by the first drive means 34 of the intermediate portion 17.

The outer ring 19 is temporarily freed from contact with the ring 23 by means of the first drive 34, and the thread severing mechanism 44, here in the form of a winding mechanism, is driven in rotation by the third drive 42 and thus severs the upper thread 31 and the lower thread 32. The winding mechanism 44 is then switched to reverse rotation and the torn thread end is transferred to the suction nozzle 12 or the nipper tube 25 where the thread end is removed.

To cut back the upper yarn 31 or the lower yarn 32, the winding mechanisms 44 are driven so that the upper yarn 31 and the lower yarn 32 are wound onto the corresponding winding mechanisms 44, respectively. Since the upper yarn 31 and the lower yarn 32 are untwisted at this point and clamped by the intermediate portion 17 of the friction disc 16, the upper yarn 31 and the lower yarn 32 tear, by the fibers which are almost parallel to each other and side by side sliding apart without twisting.

Then, the winding mechanism 44 is switched to reverse rotation immediately or after the completion of the yarn junction formation, and the torn ends of the upper yarn 31 and the lower yarn 32 are transferred to the suction nozzle 12 or the nipper bobbin 25 from which the ends are removed.

After the truncation, both the inner ring 18 and the outer ring 19 of the multi-piece friction disc 16 are moved axially by the first drive means 34 and are moved closer to the opposite friction disc 16 having its middle portion 17 and ring 23. The two friction disks 16 have a plurality of recesses 26, into which guide means 27 can be inserted. The guide means 27 serve to keep the approximately parallel fiber orientation obtained after the yarn untwisting and the shortening of the upper yarn 31 and the lower yarn 32 and the brush-like yarn ends centered or bundled so that the yarn end fibers can be twisted with one another by a renewed counter-rotation of the friction disc 16.

The first drive means 34 causes the intermediate portion 17 of the multi-piece friction disc 16 to be moved axially out of contact with the opposing intermediate portion 17 before the friction disc 16 is in turn driven in a relative rotational direction by the second drive means 35 to twist the ends of the upper yarn 31 and the lower yarn 32 or twist.

Finally, the inner ring 18 and the outer ring 19 of the multi-piece friction disk 16 and the ring 23 of the opposite friction disk 16 are then rotated in opposite directions by means of the second drive 39, so that the yarn approximately acquires its initial yarn twist again.

The friction disc 16 is then opened by means of the first drive means 34 and the yarn is released. The winding operation may then continue.

Claims

1. A yarn connecting device (10) for the knotless connection of two yarn ends, the yarn connecting device (10) having friction discs (16) for applying a mechanical action to the yarn ends to be connected, the friction discs (16) being mounted so as to be rotatable relative to one another and movable towards one another and being provided with yarn severing means (33) for severing the yarn, respectively, characterized in that one of the friction discs (16) is of multi-part construction and has an intermediate part (17), an inner ring (18) and an outer ring (19), the intermediate part (17), the inner ring (18) and the outer ring (19) being mounted so as to be axially movable, so that the other friction disc (16) has at least one intermediate part (17) and one ring (23), the yarn connecting device being provided with at least the intermediate part (17) and at least one ring (23) for the friction disc (16) of multi-part construction, A first drive device (34) for axially moving the inner ring (18) and/or the outer ring (19) closer together, wherein a control device is associated with the first drive device (34), wherein the yarn connecting device is provided with a second drive device (39) for rotating the inner ring (18), the outer ring (19) and/or the ring (23), wherein a control device is associated with the second drive device (39), wherein a third drive device (42) for operating the yarn breaking device (33) is provided, wherein a control device is associated with the third drive device (42), and wherein the control devices of the first drive device (34), the second drive device (39) and the third drive device (42) can be connected to a central control unit via which the first drive device (34) and the third drive device (42) can be centrally set, -the movement of the second drive means (39) and the third drive means (42).

2. Yarn connecting device (10) according to claim 1, characterised in that the size of the axial distance between the friction discs (16) during the application of the yarn can be adjusted as specified by the first drive means (34).

3. Yarn connecting device (16) according to claim 1, characterised in that the rotational angle of the friction disc (16) or the inner ring (18), the outer ring (19) and/or the ring (23) can be adjusted as specified by the second drive means (39).

4. Yarn connecting device (10) according to claim 1, characterised in that the yarn severing device (33) is designed as a reversibly drivable winding device (44) with a slotted head (45).

5. Yarn connecting device (10) according to claim 4, characterised in that the rotation of the winding mechanism (44) can be regulated as desired by means of the third drive (42).

6. Yarn connecting device (10) according to claim 1, characterised in that the central control unit is a central control unit (47) of a textile machine (1) which produces wound bobbins.

7. Textile machine for producing wound bobbins, having a yarn connecting device (10) for the knotless connection of two yarn ends, characterized in that at least one yarn connecting device (10) is formed according to claim 6.