EP0947618B1 - Method for producing a yarn and spinning machine therefor - Google Patents

Description

The invention relates to a method for producing a yarn, in which a fiber sliver delivered by a drafting system first subjected to compression and then rotated and is wound up as well as a spinning machine, by means of which a such procedure is executable.

Compaction devices in the form of with a perforation track provided, rotating, cylindrical rollers (DE 44 26 249 A1) or of circumferential, with a perforation track Flexible straps (EP 0 635 590 A2) are known.

Drafting systems with several pairs of rollers and one Fiber bundling zone, which is connected to the pair of output rollers of the The drafting device is also in WO-A-9839505 described.

In these known devices, a perforated strap is guided around a suction shoe that can be pressurized and a lower delivery roller adjacent to the pair of output rollers.
The lower delivery roller is attached to a support body which is mounted to be movable about a pivot axis.
The lower delivery roller and thus also the apron are each acted upon by an additional drive roller, which is fixed on a machine-long drive shaft.

The compression of a fiber sliver delivered by a drafting system offers the advantage that the fiber sliver is summarized closely can be fed to the twist zone in which it becomes a yarn is solidified. Jumps into this tightly summarized fiber sliver the rotation given to it by the rotation device to close to the clamping line, i.e. the spinning triangle is very small. This has the consequence that the loss of splitting edge fibers is minimal and that the yarn produced has little protruding fibers has, i.e. has low hairiness.

The compaction devices described above are generally used in ring spinning machines.
As is known, on the spinning stations of such ring spinning machines, the drawn and compacted fiber sliver is given a rotation by means of a driven spinning spindle and the thread that is produced is wound onto a so-called spinning cop.
For this purpose, the spinning devices of such ring spinning machines also each have a ring traveler rotatably mounted on a spinning ring, which is carried along by the circulating thread and through which the fiber sliver is guided.

In addition to such ring spinning machines, pot spinning machines have also been known for a long time in the textile industry. As described, for example, in DE 195 23 938 A1, in a pot spinning device, the fiber sliver warped in a drafting device and spun into a thread under the action of a rotating spinning pot is guided into the interior of the spinning pot via an axially movably mounted thread guide, where it is referred to as a so-called yarn cake temporarily stored the inner wall of the spin pot.
The yarn cake is then rewound by inserting a wrapping tube into a spinning cop, which is further processed.

It has been shown that the beneficial effect of compression spinning by rotating and twisting according to the invention the fiber sliver further using a pot spinning device can be increased. A twisting and winding up of the fiber sliver using a pot spinning device is balloonless and reduced thereby the thread tension in the thread piece between the Deposit point of the yarn in the spinning pot and the pair of exit rollers of the drafting system in this thread piece in comparison with one Ring spinning device. Apparently this effect supports the Effect of compacting the fiber sliver.

The invention therefore provides that delivered by a drafting system First subject the fiber sliver to compression before being solidified and wound by giving rotation becomes.

The spinning machine according to the invention for performing this method accordingly has drafting systems with compression devices as well as pot spinning devices. The one at the exit of a Drafting device arranged compression devices can be used as rotating, rigid, hollow and internally under suction suction rollers with a perforation track on their circumference or as circumferential belts, preferably in the form of straps be trained. The perforation track under suction is in the direction of the movement of the fiber sliver Row of small suction openings to which the fibers of the fiber sliver are attached be sucked in.

The pot spinning devices can be of any known type his.

In addition to the production of simple yarn is also advantageous when manufacturing core yarn or / and from false twine. Accordingly can the device according to the invention also with devices for manufacturing by coregarn and / or false twine.

In a core yarn, the core thread should be as complete as possible the sheath fibers that determine the outer appearance of the yarn be embedded. Done in normal core yarn spinning this is because the core thread of the last one, as a rule in other words in the main warping area, the fiber sliver diverged widely is fed while laying the sheath fibers around the Core thread by rotating the fiber structure between the pair of output rollers and the organ giving the rotation, in all So usually a ring spinning spindle takes place. This embedding is done often incomplete in places along the yarn, which represents a loss in quality of the core yarn produced.

Embedding the Core thread in the sheath fibers additionally supported for screwing creating a more effective, less gapy one and covering the length of the yarn more evenly Core thread through the sheath fibers.

A particularly effective embedding of the core thread is then achieved if this according to the invention before the compression zone fiber sliver still lying there is fed as centrally as possible becomes. This is particularly the case if the core thread is the Output roller pair of the drafting system fed on its inlet side becomes.

In a modification of this embodiment, the core thread can also be direct be fed to the compression zone. One strappy having compression device, the core thread Drafting system fed from that side - from above or from below on which the strappy is arranged and around the Deflection edge on the inlet side of the apron. In the other case, the apron is in the area of its inlet side assigned a guide roller around which the core thread is guided. If the compacting device has a suction roller, can the core thread can also be fed to the circumference of this suction roller.

The arrangement can be such that each fiber sliver is one Core thread runs in or several core threads run in and out a core yarn is formed by twisting. It is however also possible, in particular two with at least one Core threads of doped fiber lunches converge before giving rotation and then only by giving rotation to produce a so-called false thread from two core yarns.

A false thread is a textile thread, at which is given two twists of untwisted fibers together. Here, the two fibers are wrapped around each other and given the fiber structure thus formed rotation. Real thread this false twist differs in that the two Components do not have their own rotation, but only by the looping around by turning them together in the end product are kept similarly separate from one another real thread is the case.

A false thread seems all the more similar to a real thread, the more clearly the two components can be seen in the false twine stay. By compacting, the fibers that make up each of the two fiber lunches, each to a compact fiber structure summarized that when merging far less into one Tilt together with the respective other fiber structure. The two fiber associations therefore remain more clearly apart separated and the false thread appears more like a real thread.

Fig. 1

eine erste Ausführungsform der Erfindung im Querschnitt durch den Streckwerksbereich und durch die Spindelreihe;

Fig. 2

eine Variante des Gegenstandes der Fig. 1 ausschnittsweise in gleicher Darstellung;

Fig. 3

eine Vorderansicht der Verdichtungsvorrichtung der Fig. 2 teilweise geschnitten;

Fig. 4

eine weitere Ausführungsform in Darstellung wie in Fig. 1;

Fig. 5

eine Vorderansicht der Vorrichtung der Fig. 4;

Fig. 6

eine weitere Ausführungsform in Darstellung wie in Fig. 1;

Fig. 7

die Vorderansicht des Gegenstandes der Fig. 6;

Fig. 8

eine weitere Ausführungsform in Darstellung wie in Fig. 1;

Fig. 9

die vereinfachte Vorderansicht des Gegenstandes der Fig. 8;

Fig. 10

eine Variante der Verdichtungsvorrichtung ausschnittsweise am Streckwerk, im Schnitt;

Fig. 11

eine weitere Ausführungsform in Darstellung wie in Fig. 1;

Fig. 12

die Draufsicht auf den Gegenstand der Fig. 10.

Exemplary embodiments of the invention are shown schematically in the figures of the drawing.
Show it

Fig. 1

a first embodiment of the invention in cross section through the drafting system area and through the spindle row;

Fig. 2

a variant of the object of Figure 1 in sections in the same representation.

Fig. 3

a front view of the compression device of Figure 2 partially cut.

Fig. 4

a further embodiment in representation as in Fig. 1;

Fig. 5

a front view of the device of Fig. 4;

Fig. 6

a further embodiment in representation as in Fig. 1;

Fig. 7

the front view of the object of Fig. 6;

Fig. 8

a further embodiment in representation as in Fig. 1;

Fig. 9

the simplified front view of the object of Fig. 8;

Fig. 10

a variant of the compression device in sections on the drafting system, in section;

Fig. 11

a further embodiment in representation as in Fig. 1;

Fig. 12

the top view of the subject of FIG. 10th

The spinning machine according to the invention has a drafting system 1 which is more common Design with an input roller pair 2, a middle roller pair 3 and a pair of output rollers 4. The bottom rollers 2 ', 3' and 4 'of these roller pairs are designed as steel rollers, which extend over the length of the drafting system area of the spinning machine extend and point in the area of work Fluting on. The top rollers 2 ", 3" and 4 "are as twin top rollers trained who provided with elastic covering 5 and by means of a handlebar, not shown, on one indicated in FIG Carrying and loading arm 6 are mounted and spring-loaded. The rollers 2 'and 2 "of the middle roller pair 2 are with straps 7 equipped, each in not shown, also on Support and load arm 6 or on the punch of the drafting system stored strappy cages are guided. This drafting system 1 delivers a stretched to the desired delicacy, but still unconsolidated fiber sliver 8.

It is understood that the invention also with other types of Drafting systems can be realized. Likewise, the drafting system 1 different compression devices 9 for the The fiber sliver delivered downstream of the drafting system.

In the embodiment of FIGS. 1 to 3 there is the compression device 9 from a suction roll 10 above the Path of the fiber sliver 8, i.e. above the stretching field level is arranged. It rests on two lower rollers 11 and 12, over the length of the drafting system area of the spinning machine run through and are driven.

To avoid that of the pair of output rollers 4 of the drafting system 1 to the suction roller 10 fiber sliver 8 running about when wanted Switch off or in the event of an unwanted collapse of the the suction roller acting suction train falls down or while walking by of a traveling wind blower through its blowing stream is, the lower roller 11 can be wrapped by a conveyor belt 13 be, which by means of known leadership means such For example, a deflection rail up to close to the clamping line of the pair of output rollers of the drafting system extends. Through the strap 13 the fiber sliver 8 is worn and supported and prevented from tearing off.

The sectional views of FIGS. 2 and 3 in different Directions show the formation of the suction roller 10. It is pot-shaped and has a perforation 14 in on its circumference Form of arranged in one line or in two lines (Fig. 3) small suction openings 15. She is with their twin roller on one in the support and load arm 6 Axis 16 mounted. One protrudes through its open side suction chamber 18 formed by a screen 17 into its interior. The suction chamber 18 is connected to a pipe 19 Suction source 20 connected to a motor 21 and a suction pump 22 may include. By means of the suction chamber 18, the suction of the Suction source 20 on a peripheral region of the suction roller 10 a compression zone 23 limited. The length of this compression zone 23 depends on the length of the. fibers to be compressed and is usually not less than for cotton about 15 mm.

The suction roll 10 is usually made of steel. To metallic Contact between her coat and the usually to avoid steel lower rollers 11 and 12, too Wear, noise, and glide would result in either Suction roll 10 or the lower rolls 11, 12 with elastic covering 5 Mistake. In the embodiment shown in Figs. 1 and 3 it is the suction roll 10 which is provided with the elastic covering 5 in the embodiment of FIG. 2, the lower rollers 11 and 12.

4 and 5 show an embodiment in which a suction roll 24, the rest of the structure of the suction roller 10 of FIG. 1st can correspond to 3, below the run of the fiber sliver 8, the stretching field level is arranged. She is assigned one Top roller 25, which acts as a rotation stop for the rotation issuing device initiated rotation. Inside the Suction roller 24 is again arranged a suction chamber 18 which Compression zone 23 limited. At the beginning of compression zone 23 a further top roller 26 can be arranged.

6 and 7 show a variant of the device of FIG. 5, on a separate pair of output rollers of the drafting system 1 is waived. The function of the pair of output rollers 4 of the drafting system as a pair of output rollers of the main drafting zone is here by the suction roller 24 and the other assigned to it Top roller 26 taken over.

In the embodiment of FIGS. 8 and 9 there is the compression device 9 from a suction belt 27, which is a top roller 28 loops, which are provided with elastic covering 5 can. This suction strap 27 has the center around its circumference Perforation 14 on. Inside the suction strap 27 is the suction chamber 18 arranged the suction on the compression zone 23 in which it opposes the inner scope of the Suction strap opens. The acts in this compression zone 23 Suction on the outside of the suction strap 27. The top roller 28 lies with the suction strap 27 wrapping around it on one driven lower roller 29, which is also over the length of the stretching field area of the spinning machine.

In the embodiment of FIG. 10, the compression device 9 also a suction strap 30 made of elastic plastic on the suction strap described above 8 can be the same, but here wraps around a lower roller 31. This lower roller 31 lies with its suction strap 30 on one Drive lower roller 32 on that than over the drawing area the spinning machine continuous steel roller is formed and serves to drive the lower roller 31. The one wrapped by the suction strap 30 Lower roller 31 is assigned an upper roller 33. The Suction straps 30 have the perforation 14 in shape around its circumference arranged suction openings 15. Within this Suction strap 30 is also one as described above arranged to a suction source 20 connected suction chamber 18. The suction belt lower roller 31 and the upper roller 33 are as Twin rollers trained. The top roller 33 can be elastic Cover 5 or - since they on the suction strap 30 rests on elastic plastic, including a steel jacket to have. The arrangement of a separate strappy twin bottom roller 31 is therefore chosen so that the suction strap 30 when worn can be exchanged more easily.

In all embodiments, the compression aggregates Suction roller 24 (Fig. 4, 5 and 6), suction strap 27 (Fig. 8) and Suction straps 30 (FIG. 10) associated with upper rollers 25, 26; 28 and 33 as well as the top rollers 2 ", 3" and 4 "of the drafting system 1 be held and loaded in its carrying and loading arm. Likewise, in all embodiments, the lower rollers 2 ', 3' and 4 'of the drafting unit 1 and those assigned to the compression units Lower rollers 11, 12; 29 and 32 or the lower rollers 4 and 5 or 6 and 7 by means of a dot-dash line in FIG Line of action 34 indicated gear in coordinated Speed ratios to be driven. The drive can too by means of individual drives, their mutual speed dependency is also represented by the line of action 34.

The compression device 9 can also according to FIGS. 11 and 12 a perforation 14 containing on its peripheral surface, have disc-shaped suction rotor 35 which is arranged so that the level of its perforation lies approximately in one level, which the output rollers 4 ', 4 "of the output roller pair 4 in whose clamping line is tangent. As a result of its disc-shaped design and by additional chamfers on its peripheral surface can the suction rotor 35 in the gusset between the rollers of the Output roller pair 4 and thus very close to the nip line be brought closer. The suction rotor 35 is in Fig. 12 in the Level his perforation 14 cut open so that the in his Internally arranged suction chamber connected to the pressure sink 20 18 becomes recognizable. The suction chamber 18 delimits in the suction rotor 35 a compression zone 23, which is close to the clamping line of the output roller pair 4 begins and for example by a quarter extends the circumference of the suction rotor. At the end of the compression zone 23 is a pressure roller 36 on the circumference of the suction rotor 35 resilient by means of a spring 38 engaging on its holding arm 37 pressed. The suction rotor 35 can by means of its shaft 39 a tangential belt 40 are driven. Through the hollow Shaft 39 can also pipe 19 into suction chamber 18 extend.

The compaction device 8 is a pot spinning device 41 downstream. This pot spinning device 41 has a spinning pot 42 on the one containing its drive and its bearing Pot bench 43 is stored. Protrudes into the spin pot 42 a thread guide tube 44, which does not have an arm 45 with a more thread guide shown is connected. The thread guide tube 44 is in the for the construction of the spider cake 46 in Spin pot 42 required, known and therefore not here Each described way moves up and down.

In operation, the drafting system 1 delivers from the output roller pair 4 a fiber sliver 8, which due to the diameter of the incoming Roving and the warping has a certain width. This fiber sliver 8 is due to the suction of the suction chamber 18 sucked into the respective suction unit and on this in the Compression zone 23 compressed. Here, the in the Fiber sliver 8 fibers lying on the side to the narrow line of the Perforation 14 sucked in and the fiber sliver thereby compressed. In this compacted state, it is attached to the pot spinning device 41 delivered and from this by rotation solidified and wound up.

In the case of the suction rotor 35 of Figs. 11 and 12 is beyond the advantage offered that the broad from the pair of output rollers 4th leaking fiber sliver 8 by the movement of the in this Already gets a summary in the direction of the rotating suction rotor, which then result from the compression in the compression zone 23 of the suction rotor is further increased. In the case of the suction rotor 35 the fiber sliver 8 can also be varied as usual, since this oscillation in the direction of the perforation 14 on the circumference of the suction rotor and therefore the fiber sliver in all traversing positions can be grasped by the perforation.

In addition to the production of simple yarn is also advantageous when manufacturing core yarn or / and from false twine. Accordingly can the device according to the invention also with devices for manufacturing by coregarn and / or false twine. Core yarn is a yarn in which one is preferred core thread consisting of an endless synthetic thread due to sheath fibers of finite length, usually cotton or / and Wool fibers, is covered. Under false twine is a Understood the thread, in which two fiber matches without their own twist rotated together. The two fibers are retained To a certain extent, the resulting thread is separated to a certain extent like a brain that the thread resembles a thread in appearance.

To produce core yarn, the spinning machine is equipped with a Core yarn device 47 equipped - as can be seen in Figure 8 - Consists of two rolling rollers 48, on which one Core thread spool 49 containing core thread 49 rests. From one the unwinding rollers 48 are the core thread 50 on the inlet side the top roller 4 "of the output roller pair 4 of the drafting system. The rolling rollers 48 are at one of the peripheral speeds of the output roller pair 4 corresponding peripheral speed driven.

It is thereby achieved that the core thread 49 of the fiber sliver 8 with their withdrawal speed from the main delay field between the roller pairs 3 and 4 corresponding speed. The core thread 49 also runs through a core thread guide 51, the traversing movement of the core thread 49 on the core thread spool 50 neutralized and that over an action line 52 thus connected to the roving inlet hopper 53 of the drafting system is that it is adjusted to this and if it changes, with this changes. This ensures that the core thread 49 of the fiber sliver 8 is always fed in the center. It therefore runs in the still wide running at this point Fuse 8 and is then in the subsequent compression zone 23 by moving closer together under the effect of the suction Sheath fibers of the fiber sliver are covered tightly and opaque and to core yarn 54.

It is understood that the core thread 49 of the fiber sliver 8 also on Start of the compression zone 23 could be supplied. He can then directly the suction roll 10 or 24 (Fig. 1 to 3 or 4 and 7), or the suction straps 27 or 30 (Fig. 8 and 9 or 10). In the case of the suction rotor 35 (FIGS. 11 and 12) the Core thread 49 are laterally fed to the suction rotor.

In Figure 7 is also on the compression device of Fig. 6 illustrated the possibility of producing the drafting system 1 Equip false thread. Here, the suction roll 24 has a Perforation 14 in the form of two spaced apart Rows of suction openings 15, by means of the two at the respective Work station in drafting system 1 separated, stretched in parallel and delivered side by side by the pair of output rollers 4 Fibrous webs 8, 8 'are still compressed separately. To These compressed fiber slivers 8, 8 'run off the suction roll 24 of the compression device 9 run the two fiber slits at union point 55 together and by the pot spinning device 41 rotated to form a false thread 56 and wound.

So that when one of the two breaks, the components of the Fake yarn 56 forming fiber yarns 8, 8 'the remaining A staking device can not keep the fiber sliver running as a single thread be provided if one of the two breaks Components also the other leads to breakage. This parking facility 57 consists of a trap 58 with a pair of pins 59, between which the false thread 56 passes. The trap 58 sits on a support 60 with a narrow stability range and can be pivoted about an axis 61 thereon. If one of the breaks both components of the false twist 56, shifts the remaining component laterally so far that the trap 58 is pivoted out of its stability range and after tilts down. The remaining component is the Pair of pins 59 looped and by preventing rotation propagation also led to breakage.

It goes without saying that at least one of the two is a false thread 56 also combined components with the device of FIG. 8 and 9 can be manufactured core yarns 54.

It is also understood that the described and illustrated Variants of the components of the spinning machine according to the invention like the indispensable - drafting device 1, compression device 9 and pot spinner 41 - and the optional ones - like core twine 47 and device for producing Scheinzwirn 56 - also in other than those described and shown Combinations can be realized.

LIST OF REFERENCE NUMBERS

1

drafting system

2

Pair of input rollers

3

Central roller pair

4

Roller pair

2 ', 3', 4 '

bottom rollers

2 ", 3", 4 "

top rollers

5

Elastic cover

6

Low load and load

7

Strappy

8, 8 '

roving

9

compacting device

10

suction roll

11, 12

bottom rollers

13

Transportriemchen

14

perforation

15

suction

16

axis

17

umbrella

18

suction chamber

19

Hose, pipe

20

suction source

21

engine

22

suction pump

23

compression zone

24

Suction roll (Fig. 4; 5)

25, 26

top roll

27

Suction straps (Fig. 8; 9)

28

top roll

29

bottom roll

30

suction belt

31

bottom roll

32

Drive lower roll

33

top roll

34

line of action

35

suction rotor

36

pressure roller

37

holding arm

38

feather

39

Suction rotor shaft

40

tangential

41

Pot spinning device

42

spinning pot

43

pot Bank

44

Yarn guiding pipe

45

poor

46

spinning cake

47

Coregarneinrichtung

48

unrolling rollers

49

core thread

50

Core bobbin

51

Core thread thread guide

52

line of action

53

Roving inlet funnel

54

core yarn

55

rallying point

56

false twist

57

shelf device

58

Cases

59

pair of pins

60

In stock

61

axis

Claims (6)

1. Method for producing a yarn, in which a roving delivered by a draw-frame initially undergoes compression and then by means of a balloonless pot-spinning device, is twisted and wound in a traveller with slight tensile stress between the point where the yarn runs off the draw-frame and the point where it is deposited in the spinning pot and without a tight deflection.
2. Spinning machine with draw-frames (1), which deliver at least one roving (8) on each pair (4) of output rollers and have pneumatic compressing devices (9) at their outlets in order to compress the at least one roving by means of a perforation (14) subjected to vacuum, and with pot-spinning devices (41) for twisting and winding the compressed rovings without a traveller and therefore with minimal tensile stress and without a tight deflection around a traveller.
3. Spinning machine according to claim 2, characterised in that the compressing devices (9) are constructed as suction belts (27, 30) comprising the perforation (14). (Figure 8 to 10)
4. Spinning machine according to claim 2, characterised in that the compressing devices (9) are constructed as suction rotors (35) comprising the perforation (14). (Figure 11; 12)
5. Spinning machine according to claim 2, characterised in that the spinning machine comprises a device (47) for producing core yarn (54). (Figure 8; 9)
6. Spinning machine according to claim 2, characterised in that the compressing devices (9) are equipped for the production of false twist (56). (Figure 3; 4 and 5; 7)

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