EP1907612B1 - Joining method on a jet spinner machine spinning device and jet spinning machine - Google Patents

Abstract

The invention relates to a joining method on a jet spinning machine, comprising at least one spinning device (5), in which a thread is formed by means of a spinning jet device which generates an injection flow in cooperation with a hollow spinning cone, whereby an auxiliary thread (30) is used for joining thereto. The auxiliary thread (30) is subsequently discarded and the newly spun thread (26) spliced to the end of the upper thread (38). The spinning device (5) is provided with a first clamping device (48) for the temporary clamping of the upper thread (38) and a second clamping device (52) for the temporary clamping of the auxiliary thread (30). The jet spinning machine can be provided with an operating carriage (10) running along the spinning posts (2).

Description

The invention relates to a piecing method on an air spinning machine according to the preamble of claim 1 and to a spinning device and an air spinning machine for carrying out the piecing process.

Air-jet spinning machines usually comprise spinning devices to which a drafting device feeds a fiber ribbon drawn to a fiber bundle. The sliver passes through a spinneret, in which it is acted upon by vortex air streams and thereby provided with a real wire or a real twist. Downstream of the spinneret, a hollow spinning cone is positioned, through which the sliver is withdrawn as a thread from an outlet opening and then wound up on a take-up spool as an upper thread.

The DE 3611050 A1 describes a spinning unit which is intended to produce bobbins serving as feed bobbins. On the feed bobbins essentially untwisted thread components are wound up. For piecing two auxiliary threads are each deducted from an auxiliary coil. The ends of the auxiliary threads are transferred by means of thread clamps an extraction and then inserted from the thread clamps in a trained as a pair of rollers take-off device, then in the false twisting device and finally from the side in the pair of output rollers of a drafting system. The activated false twisting device acts on the auxiliary threads with a false twist. The auxiliary threads transport the false twist counter to the thread running direction up to the exit rollers of the Drafting system. For piecing a fiber strand is fed to the current auxiliary threads of the drafting system. The auxiliary threads and their respective supplied fiber strand is now issued together from the false twisting device of the output rollers of the drafting system to the false twist device a false twist. The spinning unit of the DE 3611050 A1 is not suitable for producing a spun yarn with true twist. An insertion of the auxiliary threads according to the disclosure of DE 3611050 A1 From the side, it is not possible to use air-spinning devices that work with twist-jam and a hollow spinning cone.

In the EP 1 072 702 A2 As the state of the art, an air-spinning machine is described in which the end of the upper thread is transported by means of a transfer arm into the vicinity of the outlet opening of the spinning cone called a spindle at the start or at yarn breakage. From there, the upper thread runs from the direction of the thread feed side from opposite direction through the spinning cone and the spinneret and is sucked into a suction element. The fiber bundle on the delivery side, which emerges from the drafting system, is also sucked into the suction element and engulfed with the upper thread. The two entangled threads are then sucked into the spinneret for bonding. In this method, the upper thread must be advanced from the spinning device to the suction element in the opposite direction to the spinning operation. During this preparation phase for the thread connection often occur errors that interfere with the formation of a thread connection or even prevent. Another disadvantage is that the thread section, which contains the connection between upper thread and fiber bundles, is clearly noticeably thicker than the rest of the thread. Such a thick spot is in the final product, for example, a fabric, disturbing and represents a quality defect. In addition to the disadvantage that the thread connection process often unsuccessful, the length of the thread section forming the piecemeal is hardly controllable. Approximately equal lengths of the piecer are not guaranteed.

To overcome these problems, the EP 1 072 702 A2 a spinning device for an alternative piecing process. This spinning device has a spinning cone with spinnerets near the tip and with an axially extending spun yarn passage through which the spun yarn is withdrawn. The spun yarn channel widens stepwise towards its yarn outlet side. These piecing nozzles serve to generate vortex air streams in the spinning cone by means of supplied compressed air, by means of which a negative pressure is generated at the tip of the spinning cone. If both the customary spinning nozzles and the piecing nozzles arranged downstream of the spinning nozzles in the spinning cone are subjected to compressed air, the fiber bundle supplied by a drafting device is first subjected to a rotational flow and conveyed to the mouth of the spinning thread channel at the tip of the spinning cone. Due to the negative pressure generated there by the activated piecing nozzles, the fiber bundle is sucked into the spun yarn channel, is acted on passing the piecing nozzles with a rotational flow which is opposite to the spinnerets and transported by the outflowing compressed air to the yarn exit end of the spinning cone. The piecing nozzles briefly impart a false twist to the fiber bundle during piecing. After the thread has reached the take-off rolls arranged downstream of the spinning cone and is clamped there, the piecing nozzles are deactivated, and then a normal thread is spun with real wire. The yarn portion which has been spun with false-twist is cut off and the end of the newly-spun yarn is connected to the end of the upper thread drawn off from the package by a splicer.

So that the tip of the fiber bundle can be sucked into the spinning cone during piecing, the bore diameter of the mouth of the spun yarn channel must have a minimum size, which is for example 1 mm in diameter. The limitation of the bore diameter leads to significant limitations in influencing the yarn character.

It is an object of the invention to eliminate the aforementioned disadvantages.

This object is achieved by the method according to claim 1 and by a spinning device according to claim 10 and an air-jet spinning machine according to claim 13.

The invention allows a simple threading of a piecing thread and reduces the number of failed Anspinnversuchen. The yarn character can be better influenced. If a splice connection is selected, only a virtually yarn-like splice connection remains in the finished yarn, which does not lead to a reduction in the quality of the finished product.

If the auxiliary thread differs in its properties from the rest of the thread, the auxiliary thread can be selected so that a better threading is achieved with it. Particularly suitable is an auxiliary thread that is stiffer and / or smoother than the rest of the thread. It may also be advantageous if the auxiliary thread is firmer or finer than the rest of the thread.

Compared with the method of inserting the end of an upper thread into the spinning device in the direction opposite to the spinning direction normal to the spinning operation before being spun, the use of an auxiliary thread enables a marked improvement in threading. In particular, then an improvement is observed when, instead of just a fiber bundle, in the Spinning normal thread running direction to introduce the spinning device before spinning, an auxiliary thread is used.

In order to minimize the occurrence of burring errors, the introduction of the auxiliary thread into the spinning device takes place in two stages. In this case, in a first stage, the introduction of the auxiliary thread in the sliver channel is made in front of the spinneret device by means of injector flow and in a second stage, the introduction of the auxiliary thread into the spinning cone by applying the spinning cone with negative pressure. Temporarily for the introduction of the auxiliary thread, the spinneret and the spinning cone so far apart positioned so that the auxiliary thread between the spinneret and the spinning cone can be detected manually. This allows threading to be performed essentially manually in a simple manner. But it is also possible to automate the handling, at least partially.

If, during piecing, a piecing speed is set which is lower than the speed during normal spinning operation, the risk of problems with the piecing process can be reduced.

A splicing of the thread ends can be suitably prepared if the spinning device has a first clamping device for temporary clamping of the upper thread and a second clamping device for temporary clamping of the auxiliary thread.

Preferably, the second clamping device is a transport means for conveying the auxiliary thread and then following rewoven thread. The spinning device preferably has the following components:

A storage means for storing the auxiliary thread and the rewoven thread, a separating means for separating the auxiliary thread from the thread and a splicing means for connecting the newly spun thread with the upper thread.

These components can be arranged stationarily at the spinning station of the air spinning machine. Alternatively, in the case of a large number of spinning stations on the air-spinning machine, these components can be arranged exclusively on at least one operating carriage which can be moved along the spinning devices of the air-spinning machine. As a result, the structural complexity of the air-spinning machine can be reduced.

Advantageously, at least one clamping device for temporary clamping of the auxiliary thread on the operating carriage is arranged.

The invention will be explained in more detail with reference to FIGS.

Fig. 1

eine vereinfachte Ansicht einer Luftspinnmaschine,

Fig. 2

eine Spinnvorrichtung einer Luftspinnmaschine mit vorgeordnetem Streckwerk, teilweise im Schnitt und vereinfacht, in gegenüber Figur 1 vergrößerter Darstellung,

Fig. 3

eine geteilte Spinnvorrichtung in Einfädelposition,

Fig. 4

die Spinnvorrichtung der Figur 3 mit eingefädeltem Hilfsfaden,

Fig. 5

eine Prinzipdarstellung einer Spinnstelle mit Bedienwagen in Seitenansicht, vor dem Spleißvorgang,

Fig. 6

die Spinnstelle der Figur 5 nach dem Spleißvorgang,

Fig. 7

die Spinnstelle der Figur 5 in normalem Spinnbetrieb,

Fig. 8

eine Prinzipdarstellung einer Spinnstelle in Seitenansicht mit Spleißeinrichtung und Fadenspeicher in normalem Spinnbetrieb,

Fig. 9

die Spinnstelle der Figur 8 vor dem Spleißvorgang während des Anspinnvorgangs,

Fig.10

die Spinnstelle der Figur 8 während des Spleißvorgangs.

Show it:

Fig. 1

a simplified view of an air-spinning machine,

Fig. 2

a spinning device of an air spinning machine with upstream drafting, partially in section and simplified, in relation to FIG. 1 enlarged view,

Fig. 3

a split spinning device in threading position,

Fig. 4

the spinning device of the FIG. 3 with threaded auxiliary thread,

Fig. 5

a schematic diagram of a spinning station with operating carriage in side view, before the splicing process,

Fig. 6

the spinning station of FIG. 5 after splicing,

Fig. 7

the spinning station of FIG. 5 in normal spinning operation,

Fig. 8

a schematic representation of a spinning unit in side view with splicing device and yarn store in normal spinning operation,

Fig. 9

the spinning station of FIG. 8 before the splicing process during the piecing process,

Figure 10

the spinning station of FIG. 8 during the splicing process.

In the FIG. 1 shown air-jet spinning machine 1 has a plurality of in-line juxtaposed spinning stations 2. Each spinning station 2 comprises a sliver source 3, which may be formed, for example, as a spinning can, a drafting unit 4, a spinning device 5, a take-off roller pair 6, a yarn cleaner 7, a yarn laying device 8 and a package formed as a cheese 9 package. An operating carriage 10 is guided along the spinning stations 2, on rails 11, 12, movable. At one end of the air-spinning machine, a drive unit 13 is arranged.

FIG. 2 shows a drafting system with subsequent spinning device 5 and the passage of the fibers. The fiber sliver 14 drawn off from the sliver source 3 is drawn in by the upper and lower roller pair 15, 15A, which are arranged as input rollers, and is connected to the upper and lower roller pairs 16, 16A; 17, 17A; 18, 18A stretched. In a first component of the spinning device 5 is a tweezer-like twisting device 53rd and a spinnerette device 19 is arranged. The nozzles 20, 21 are connected via the line 22 to a compressed air source 23. The air flowing out of the nozzles 20, 21 generates a rotational flow, with which the stretched sliver 24 is acted upon. The second component of the spinning device 5 carries a hollow spinning cone 25. The thread 26 formed in cooperation of spinneret device 19 and spinning cone 25 is withdrawn from the spinning device 5 through the hollow spinning cone 25. The air chamber 27 surrounding the spinning cone 25 is connected by means of the line 28 to a vacuum source 29.

Further details of the spinning process by means of such spinning devices are for example the DE 199 26 492 A1 removable.

For piecing an auxiliary thread 30 is used. For this purpose, the first and the second component of the spinning device 5, which are slidably mounted on a guide, not shown, moved so far that a manually assisted threading of the auxiliary thread 30 is possible. As in FIG. 3 4, the free end of the auxiliary thread 30 is pulled off the auxiliary thread bobbin 31, guided by a cutter 37 and positioned near the junction 32 of the sliver channel 33. Then, the spinneret 19 is acted on the line 22 for a short time with compressed air from the compressed air source 23. The air flowing from the nozzles 20, 21 generates a negative pressure in the sliver channel 33, through which the free end of the auxiliary thread 30 is threaded into the sliver channel 33 and transported further in the vicinity of the junction 34 of the spinning cone 25. By means of a flexible line 35 connected to the vacuum source 29, negative pressure is applied to the outlet 36 of the spinning cone 25 and the auxiliary thread 30 is drawn through the spinning cone 25 into the line 35. This condition is in FIG. 4 shown. Subsequently, the first and the second part back in their in FIG. 2 shifted starting position shifted.

The positioning of the first and the second component and the auxiliary thread 30 takes place manually in the embodiment. An automatic or semi-automatic positioning is possible using appropriate components.

FIG. 5 shows a first phase of piecing operation at a spinning station 2 using a trolley 10. The operating carriage 10 is positioned at the spinning station 2, to be spun to the. The upper thread 38 is withdrawn from the cheese 9, wherein the upper thread 38 passes through the thread laying device 8 and the yarn cleaner 7 and is inserted into the splicing device 39. The free end of the upper thread 38 is clamped in a first clamping device 40. The auxiliary thread 30 is passed through the pair of delivery rollers 6, 6A and further manually through the conveyor roller pair 41, 41A and inserted into the splicing device 39. The end of the auxiliary thread 30 is clamped in a second clamping device 42.

The second clamping device 42 is now released, the vacuum 43 applied with negative pressure and the conveyor rollers 41, 41A set in rotation. Of the roller pair of the drafting system 4 formed from upper roller 18 and lower roller 18A sliver 24 is conveyed to the junction 32 of the sliver channel 33 and the spinning device 5 is activated. The sucked fibers of the sliver 24 are connected in the spinning device 5 on the current auxiliary thread 30. After a short time, the auxiliary thread 30 is severed by means of the cutting device 37 and the thread 26 is now formed only from the supplied sliver 24. When the auxiliary thread 30 including the portion to which the fibers of the sliver 24 are tied is taken up by the suction 43, the thread 26 in the Clamping device 42 clamped. The thread section containing the auxiliary thread 30 is separated at the clamping device 42 and sucked off by means of the suction device 43. Subsequently, the splicing device 39 is actuated. During the splicing process, the yarn 26 continuously spun by the spinning device 5 is taken up by the yarn store 44 and stored. Further explanations of spinning devices on air spinning machines contains, for example, the DE 38 24 850 A1 ,

After the splicing operation is completed, the friction roller 45 is applied to the cheese 9 as in FIG. 6 shown. The cross-wound bobbin 9 is rotated by means of the driven friction roller 45 and winds up the upper thread 38. The upper thread 38 is wound up a little faster than it is supplied by the spinning device 5 until the thread store 44 is emptied again.

Now, the thread 26 is released from the operating carriage 10, the friction roller 45 is pivoted away from the cheese 9 and recorded the normal spinning operation, as in FIG. 7 shown. The operating carriage 10 moves to the next spinning station 2, from which it is requested for a piecing process.

FIG. 8 shows an alternative embodiment of the spinning station 2 in the spinning operation. The spinning unit 2 shown here comprises a sliver source 3, a drafting unit 4, a spinning device 5, a pair of take-off rollers 6, 6A, a yarn cleaner 7, a yarn laying device 8 and a cross-wound bobbin 9 as a package. In the FIG. 8 Spinning station 2 also comprises an auxiliary thread spool 31A, a cutting device 46, a splicing device 47, a first clamping device 48 for the upper thread 38, a splitting device 47 associated cutting device 49, a pivotally mounted suction tube 50 and a yarn store 51. For piecing after a Bobbin change or a thread break, the auxiliary thread 30 is subtracted from the auxiliary thread bobbin 31 A, guided by the cutter 46 and in the spinning device 5 after the above with reference to the FIGS. 2 to 4 Threaded method described and then passed manually through the pair of withdrawal rollers 6, 6A.

The upper thread 38 is subtracted from the cheese 9, inserted into the clamping device 48 and clamped there. The suction tube 50 is pivoted from its initial position to the position shown in dashed lines. At the free end of the suction tube 50 carries a clamping device 52. At the pivot axis 53 of the suction tube 50 opens a line, not shown, with which the suction tube 50 is temporarily connectable to the vacuum source 29. The free end of the auxiliary thread 30 is sucked by applying negative pressure in the suction tube 50 and clamped by the clamping device 52. The suction tube 50 pivots back to the starting position. The auxiliary thread 30 is inserted into the splicing device 47 and into the cutting device 49. The clamping device 52 is opened, the piecing process started and the supplied from the drafting 4 fibers of the sliver 24 is connected to the auxiliary thread 30. This phase is in FIG. 9 shown. After a short time, the auxiliary thread 30 is severed by the cutter 46. When the severed end of the auxiliary thread 30 has passed the clamping device 52, the clamping device 52 is activated. For this purpose, a period of time between cutting through the auxiliary thread 30 and activating the clamping device 52 can be specified, which is sufficiently large to safely completely suck the thread section with the auxiliary thread 30 into the suction tube 50. The thread section containing the auxiliary thread 30 is separated by means of the cutting device 49 and sucked by means of the suction tube 50. The splicing device 47 carries a Splicing operation for connecting upper thread 38 and the thread 26 through. The thread 26 contains no auxiliary thread 30 more. The yarn 26 spun during the splicing operation is sucked into the yarn store 51, as in FIG FIG. 10 shown.

After completion of the splicing process, the upper thread 38 is released by the splicing device 47 and the cross-wound bobbin 9 is rotated by a drive, not shown, for winding up the upper thread 38 in the direction of the arrow. The upper thread 38 is first wound with a slightly higher thread speed, as the thread 26 is supplied by the spinning device 5 until the thread store 51 is emptied again. Now the normal spinning operation is recorded, as in FIG. 8 is shown.

Claims (14)

1. Piecing method on a spinning device of a jet spinning machine (1),

   - wherein a sliver (14) drawn to yarn thickness is supplied by a drawing frame (4) to the spinning device (5), between an input-side mechanical twist retaining mechanism (53) and a spinning cone (25), a rotational flow is produced by a spinning nozzle device, which collects fibres forming free fibre ends and winds them producing a true twist around fibres which do not take part in the rotation and are already incorporated, and the thread (26) thus formed from the sliver (14) is drawn through the hollow spinning cone (25),

   characterised in that for piecing, an auxiliary thread (30) is used, which is firstly threaded by its free end into the spinning device (5) and drawn through the spinning cone (25),

   - wherein piecing then takes place on the continuous auxiliary thread (30) not taking part in the torsion, in that the fibres of the fibre band (14) are fed onto the auxiliary thread (30) and wound around it, and

   - wherein the auxiliary thread (30) being subjected to the withdrawal is guided off and after passing the auxiliary thread end, the newly spun thread (26), which is free of auxiliary thread, is separated and connected to the end of the upper thread (38) by a knot or a splice.
2. Piecing method according to claim 1, characterised in that the auxiliary thread (30) differs from the remaining thread (26) with regard to its properties.
3. Piecing method according to claim 2, characterised in that the auxiliary thread (30) is stiffer than the remaining thread (26).
4. Piecing method according to claim 2 or 3, characterised in that the auxiliary thread (30) is smoother than the remaining thread (26).
5. Piecing method according to any one of claims 1 to 4, characterised in that the auxiliary thread (30) is introduced into the spinning device (5) counter to the normal thread running direction during the spinning operation, before piecing takes place.
6. Piecing method according to any one of claims 1 to 4, characterised in that the auxiliary thread (30) is introduced into the spinning device (5) in the normal thread running direction during spinning operation, before piecing takes place.
7. Piecing method according to claim 6, characterised in that the auxiliary thread (30) is introduced into the spinning device (5) in two stages.
8. Piecing method according to claim 7, characterised in that, in a first stage, the auxiliary thread (30) is introduced into the sliver channel (33) prior to the spinning nozzle device (19) by means of the injector flow, and in a second stage, the auxiliary thread (30) is introduced into the spinning cone (25) by means of acting on the spinning cone (25) by means of reduced pressure and in that the spinning nozzle device (19) and the spinning cone (25) are temporarily positioned for the introduction of the auxiliary thread (30) so far apart from one another that the auxiliary thread (30) can be manually grasped between the spinning nozzle device (19) and the spinning cone (25).
9. Piecing method according to any one of claims 1 to 8, characterised in that during piecing, a piecing speed is adjusted, which is less than the speed during normal spinning operation.
10. Spinning device on a jet spinning machine for carrying out the piecing method according to claim 1, which comprises a spinning nozzle device (19) for producing an injector flow and a spinning cone (25) for thread formation,
    characterised in that
    a first clamping device (40, 48) for the temporary clamping of the upper thread and a second clamping device (42, 52) for the temporary clamping of the auxiliary thread (30) are associated with the spinning device (5).
11. Spinning device according to claim 10, characterised in that the second clamping device (52) is configured as a transporting means for conveying the auxiliary thread (30) and the newly spun thread (36) which then follows.
12. Spinning device according to claim 10 or 11, characterised in that at least one storage mechanism for storing the auxiliary thread (30) and the newly spun thread (26), a separating device for separating the auxiliary thread (30) from the thread (26) and a splicing mechanism (47) for connecting the newly spun thread (26) to the upper thread (38) are associated with the spinning device (5).
13. Jet spinning machine with spinning stations arranged next to one another in a row for carrying out the piecing method according to claim 1,
    characterised in that
    a storage mechanism for storing the auxiliary thread (30) and the newly spun thread (26), a separating mechanism for separating the auxiliary thread (30) from the thread (26) and a splicing mechanism (39) for connecting the newly spun thread (26) to the upper thread (38) are arranged only on at least one operating carriage (10) which can be displaced along the spinning stations (2).
14. Jet spinning machine according to claim 13, characterised in that at least one clamping mechanism (42) for the temporary clamping of the auxiliary thread (30) is arranged on the operating carriage (10).

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