EP0986659A1

EP0986659A1 - Method and spinning machine for the production of core yarn

Info

Publication number: EP0986659A1
Application number: EP99944134A
Authority: EP
Inventors: Friedrich Dinkelmann; Andreas Olbrich
Original assignee: Zinser Textilmaschinen GmbH
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 1998-04-03
Filing date: 1999-03-31
Publication date: 2000-03-22
Anticipated expiration: 2019-03-31
Also published as: WO1999051801A1; EP0986659B1; CN1263572A; DE19815054C1; JP2002500709A; DE19815054C5; DE59903302D1; US6318060B1

Abstract

A method and device for the production of core yarn (63), whereby a core yarn (12) is brought to a fibre slubbing (8) which has been refined in a drafting system before said slubbing is reinforced by twisting. The core yarn (12) is embedded in covering fibres. The fibre slubbing is compressed in a compacting device (22) after the core yarn (12) has been brought to the slubbing and before twisting occurs.

Description

Process and spinning machine for producing core yarn

The invention relates to a method for producing core yarn, in which a core thread, which is embedded in sheath fibers, is fed to a fiber slub refined in a drafting system before it is solidified by imparting rotation. The invention further relates to a spinning machine for producing core yarn with a drafting system that delivers at least one fiber sliver, with a device for feeding core thread and with a device for rotating and winding the core yarn.

The production of core yarn or core yarn is characterized in that when the yarn is formed, in particular when it is stretched to the intended fineness and solidified by twisting, a core thread is inserted into the fiber sliver and covered with sheath fibers, so that the core thread is in the best case is no longer visible. The core thread essentially contributes to the strength and elongation of the yarn produced, while the sheath fibers primarily determine the handle and the appearance of the yarn. An endless synthetic thread is therefore generally used as the core thread, while natural staple fibers such as cotton and / or wool are usually used as the sheath fibers.

In a core yarn, the core thread should therefore be embedded as completely as possible in the outer fibers that determine the outer appearance. In normal core yarn spinning, this takes place in that the core thread is fed to the fiber sliver that has diverged widely in the last, usually in the main drafting area, while the wrapping of the sheath fibers around the core thread by rotating the fiber structure between the initial pair of rollers and the organ giving the rotation, usually a ring spinning spindle. This embedding is often incomplete at some points along the yarn, which represents a loss in quality of the core yarn produced.

The object of the invention was to improve this embedding of the core thread in the sheath fibers. It achieves this through the features specified in the characterizing part of the main claim. With these features, the embedding of the core thread in the sheath fibers is additionally supported for screwing in by the compression and thus brings about an effective, less gaps and more uniform covering of the core thread through the length of the yarn by the sheath fibers.

The arrangement can be such that the fiber sliver delivered by the drafting device or, in the case of several fiber slubbing delivered by the drafting device, at least one of these fiber slubbing runs in before the exit of the main drafting zone or at the entrance to the compression zone, core thread and fiber sliver are compacted together and finally the core yarn is imparted by twisting is formed. The drafting system delivers several, in particular two, fiber slivers when producing false twists.

At the exit of a drafting device, a device for carrying out this method has a compression device which is under suction and which has a perforation track, that is to say a row of small suction openings running in the direction of the movement of the fiber sliver, to which the fibers of the fiber sliver are sucked. Compression devices in the form of rotating cylindrical rollers provided with a perforation track (DE 44 28 269 AI) or of circumferential, flexible straps provided with a perforation track (EP 0 635 590 A2) are known. A particularly effective embedding of the core thread is achieved if, according to the invention, it is fed as centrally as possible in front of the compression zone to the fiber sliver still lying there. This is particularly the case if the core thread is fed to the pair of output rollers of the drafting system on its inlet side.

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

The compression of a fiber sliver supplied by a drafting system offers the advantage that the fiber sliver can be fed together in a narrow manner to the twist zone, into which it is consolidated into a yarn. In this narrowly summarized fiber sliver, the rotation given to it by the rotating device jumps in up to close to the clamping line, i.e. the spinning triangle is very small. As a result, the loss of split-off edge fibers is minimal and the yarn produced has few protruding fibers, i.e. has little hairiness and the tight-fitting fibers effectively cover the core thread.

It has been shown that this advantageous effect of compression spinning can be increased even further by spinning without or without a balloon. Thread balloonless or reduced thread balloon spinning reduces the thread tension in the thread piece between the spindle tip and the pair of output rollers of the drafting systems and increases the twist density in this thread piece. Apparently, these effects support the effect caused by the compression of the fiber sliver.

This balloonless or thread balloon-reduced spinning can be achieved in particular by means of a spindle attachment on the spinning spindle of the ring spinning device in the form of a spinning finger or a spinning crown.

Rotating and winding up the fiber slub by means of a pot spinning device also takes place without a balloon and thereby reduces the thread tension in the thread piece between the pair of output rollers of the drafting system and the depositing point of the yarn in the spinning pot. This measure also leads to the advantages of balloonless spinning already mentioned.

Exemplary embodiments of the invention are shown in the figures of the drawing. The presentation is Siert largely schemati ^¬ and not to scale. 1 shows a first embodiment of the invention in

Cross section through the drafting system area and through the spindle row; Fig. 2 shows a second embodiment of the compression device in a representation as in Fig. 1, partly in section;

Fig. 3 is a view of the compression device of the

Fig. 1 partially cut; Fig. 4 to 7 from imple mentation forms of the invention in representation as in Fig. 1; Fig. 8 is an executive variant for the manufacture of

False thread in front view.

The spinning machine according to the invention has a drafting system 1 of common design with an input roller pair 2, a middle roller pair 3 and an output roller pair 4. The lower rollers 2 ', 3' and 4 'of these roller pairs are designed as steel rollers. det, which extend over the length of the drafting system area of the spinning machine and have reefing in the area of the workplaces. The top rollers 2 ", 3" and 4 "are designed as twin rollers, which are provided with elastic covering 5 and are mounted and spring-loaded on a support and loading arm 6 indicated in FIGS. 3 and 8 by means of a link (not shown). The rollers 2 'and 2 "of the middle roller pair 2 are equipped with straps 7, each of which is guided in strappy cages not shown, also mounted on the carrying and loading arm 6 or on the punch of the drafting device 1. The drafting system 1 delivers a ribbon-shaped, not yet consolidated fiber sliver 8 stretched to the final fineness. It is understood that the invention can also be implemented in connection with other types of drafting systems.

According to the invention, the drafting unit 1 is assigned a core thread delivery unit 9, which in the embodiments of FIGS. 1 to 3 and 5 to 8 has two unwinding rollers 10, which also extend over the length of the drafting unit area of the spinning machine. On the unwinding rollers 10 there is a core thread bobbin 11, from which a core thread 12 shown in dash-and-dot-dash lines in the drawing is guided to the input side of the output roller pair 4. The unwinding rollers 10 are driven in a manner not shown here via the gear of the spinning machine at the initial speed of the pair of delivery rollers 4. It is thereby achieved that the core thread 12 of the fiber sliver 8 delivered by the drafting unit 1 runs at the corresponding speed with its withdrawal speed from the main drafting zone between the roller pairs 3 and 4.

A core thread thread guide 13 is assigned to the core thread feed mechanism 9 and at least neutralizes the traversing movement of the core thread 12 running from the core thread spool 11. Since the ability of the compression devices described below to suck in the fiber sliver 8 or its fibers laterally is limited, the fiber sliver 8 can be yarn inlet hopper 14 of the drafting device 1 can not be changed or only to a small extent. So that the core thread 12 of the fiber sliver 8 always runs in the center, the core thread yarn guide 13 to the roving inlet funnel 14 of the drafting device 1 must be centered and this position must be maintained when the fiber sliver shifts. This can be done by mechanically coupling the roving inlet hopper 14 and the core thread yarn guide 13, which is indicated in FIG. 4 by a dash-dotted line of action 15.

However, it is also possible to use a core thread guide known per se, which is freely displaceable laterally and - entrained by the fiber sliver 8 running through the drafting device - centers the core thread 12 to the fiber sliver or tracks a moving fiber sliver.

Only the suction rotor of FIG. 7 can also summarize broadly changing fiber sliver 8, so that when it is used, both the fiber sliver by means of the common roving inlet funnel 14 at the inlet of the drafting device 1 and the core thread 12 by means of the core thread thread guide 13 - synchronized with the roving inlet hopper 14 - can vary widely.

As shown in FIG. 4, the core thread 12 can also be pulled off overhead from a fixed core thread cop 16. For this purpose, the core thread cop 16 is plugged onto a holding tube 17 and guided through this holding tube. Since in the embodiment of FIG. 4 the function of the pair of output rollers of the drafting device 1 is carried out by a suction roller 18 described later in connection with an associated upper roller 37, the core thread 12 is fed to this upper roller in this case and by the conveying action of this combination of rollers from the core thread cop 16 deducted.

As shown in Fig. 6, instead of the core thread guide 13, a core thread guide roller 20 with a central thread guide groove 21 may be provided. This core thread guide roller 20 can be mounted in the support and load arm 6 of the drafting system. Since it cannot be changed, it is not possible to change the fiber sliver 8 when it is used.

The drafting device 1 is followed by a compression device 22 for the fiber sliver 8 delivered by the drafting device 1. There are a whole series of advantageous embodiments for this compression device 22, some of which are shown in the figures of the drawing and described below.

In the embodiment of FIGS. 1 to 3, the compression device 22 has a suction roller 18, which is provided with a perforation 23 in the form of small suction openings 24 arranged in a line. The suction roll 18 is designed as a twin upper roll and is pressed onto two lower rolls 25 and 26 via a support and loading arm 6 indicated in FIG. 3. The lower roller 25 arranged upstream in the running direction of the fiber sliver 8 can be wrapped by a conveyor belt 27, which has the task of guiding the fiber sliver 8 between the pair of output rollers 4 and the suction roller 18.

Fig. 3 also shows the design of this suction roller 18. It is cup-shaped and together with its twin roller on an im. Support and load arm 6 mounted axis 19 mounted. A fixed suction chamber 28 projects into its interior through its open side. The suction chamber 28 is - also in the variants of the compression device 22 described below - connected as indicated in FIG. 1 via a pipe or hose line 29 to a suction source 32 comprising a motor 30 and a suction pump 31. The suction of this suction source 31 is limited by the suction chamber 28 formed by a shield 33 to a partial area of the perforation of the suction roller 18, to a compression zone 34. Only in this compression zone 34 is the suction chamber 28 open towards the perforation 23, so that only there the suction can act through the perforation on the outside of the suction roller 18.

The suction roll 18 is usually made of steel. In order to avoid metallic between their jacket and the generally also steel lower rollers 25 and 26, which would lead to wear, noise and sliding, either the suction roller 18 or the lower rollers 25, 26 are provided with an elastic covering 5 . In the alternative shown in FIGS. 1 and 3, the suction roller 18 is provided with the elastic covering 5, in the embodiment of FIG. 2 the lower rollers 25, 26.

FIG. 4 shows an embodiment in which a suction roll similar to that described above is used as the suction lower roll 35. It is designed as a tube provided with the perforation 23 and stored and driven in the punch of the drafting device 1. The suction chamber 28 is arranged in its interior, the suction effect of which is limited to the compression zone 34 by means of a screen 33. The suction lower roller 35 is assigned at least one upper roller 36, which serves as a rotation stop for the rotation initiated device - here in the form of a ring spinning device - initiated rotation. A further top roller 37 can be arranged at the beginning of the compression zone 34. This top roller 37 forms in this embodiment of the drafting system 1 in cooperation with the suction (bottom) roller 35, the pair of output rollers of the main drafting zone of the drafting system. The drafting unit 1 therefore has one pair of rollers less in this case than in the other design variants. The upper rollers 36 and 37 have elastic cover 5 and are mounted and loaded in the support and load arm 6 of the drafting system.

In the embodiment of FIG. 5, the compression device 22 has a suction strap 38 which is made of elastic plastic and wraps around an upper roller 39. This suction strap 38 has the perforation 23 in the center around its circumference

8th in the form of small suction openings 24 arranged in a line. Here, too, the stationary suction chamber 28 is separated within the suction strap 39 by means of the screen 33. It limits the suction effect to the compression zone 34, in which it opens against the inner circumference of the suction strap 38.

The upper roller 39 rests with the suction belt 38 on a driven lower roller 40 which, like the lower rollers of the drafting system, runs over the length of the stretching field region of the spinning machine and drives the upper roller and the suction belt.

In the embodiment of FIG. 6, the roller wrapped by a suction strap 41, which can be similar to the one described above, is arranged as a lower roller 42 below the run of the fiber sliver 8, that is to say the stretching field plane. It rests on a drive lower roller 43, which is designed as a steel roller which runs continuously over the stretching field region of the spinning machine and serves to drive the apron roller 42 and an upper roller 44 assigned to it and located above the patch panel level. As described above, a suction chamber 28 connected to the suction source 32 is also arranged within this suction strap 42. Both the suction belt lower roller 42 and the upper roller 44 are designed as twin rollers and are supported and loaded on the carrying and loading arm 6 of the drafting device 1. The top pressure roller 44 can have elastic covering 5 or - since it rests on the suction strap 41 made of elastic plastic, it can also have a steel jacket. The arrangement of a separate strappy twin bottom roller 42 offers the advantage that the suction strap 41 can be replaced more easily when worn.

7, the compacting device 22 can also have a disc-shaped suction rotor 45 which contains the perforation 24 on its circumference and which is arranged such that the plane containing the perforation lies approximately in the plane which the rollers of the pair of output rollers 4 of the drafting arrangement in whose clamping line is tangent. The interior of the suction rotor 45 again contains a suction chamber 28 delimiting a compression zone 34. The compression zone 34 extends from the output roller pair 4 by, for example, a quarter of the circumference of the suction rotor, at its end a pressure roller 46 is resiliently pressed onto the suction rotor 45. The suction rotor 45 is driven, for example, by means of an endless, circumferential tangential drive belt 49 which engages on its shaft 47 and is pressed onto it by means of pressure rollers 48. The suction rotor 45 is driven at a speed which gives its peripheral surface a speed corresponding to the delivery speed of the output roller pair 4.

The lower rollers 2 ', 3', 4 ', of the drafting unit 1 and the lower rollers 25, 26, 35, 40 and 43 of the different variants of the compacting device 22 are, as indicated by the dash-dotted line of action 50 shown in FIG shown gear or driven by means of individual drives in coordinated speed ratios.

In the embodiments of FIGS. 1, 2, 3, 5, 6 and 8, the lower rollers 25, 26, 40 and 42, from which the fiber sliver 8 runs into the area in which rotation is given, have a diameter , as he has generally proven to be useful in drafting systems for processing the respective staple fibers. For cotton, for example, this diameter is 29 mm to 33 mm.

1, 4 and 5, and 7 and 8, a common ring spinning device 51 with spindle bank 52, spinning spindle 53, ring bank 54, spinning ring 55, ring traveler 56 and thread guide 57 is arranged downstream of the compression device 22. 6 shows an embodiment in which a common pot spinning device 58 is arranged downstream of the compression device 22, with a spinning pot 60 mounted in a pot bank 59, in which

10 a spinning cake 62 is built up by means of a thread guide tube 61 moving up and down.

In operation, the drafting system 1 delivers a fiber sliver 8 from the output roller pair 4, which has a certain width due to the diameter of the incoming roving and the warping and into which the core thread 12 is inserted in the middle. By suction of one of the compression devices 22 described above, the fibers lying laterally in the fiber sliver 8 are sucked up to the narrow line of the suction openings 24 of the respective compression device, the fiber sliver 8 is thereby compressed and the core thread 12 is tightly coated by the fibers. In this compressed state, the fiber sliver 8 and the core thread 12 encased by it are delivered to the ring spinning device 51 or to the pot spinning device 58 at the clamping lines defined in the compression devices, and are twisted to give a core yarn 63 and twisted by the latter.

FIG. 4 shows the use of a ring spinning device 51 which operates without a thread balloon or with a reduced thread balloon. For this purpose, a so-called spinning finger 64 is arranged at the tip of the spinning spindle 53, which, in cooperation with the thread guide 57, catches the incoming core yarn 63, loops around the yarn tube 65 and feeds the ring traveler 56 without a thread balloon or with only a very small, reduced thread balloon . Instead of the spinning finger 64, an identically acting spinning crown which is known per se and therefore not shown and described here can also be used.

Finally, FIG. 8 shows the possibility of equipping the compression device 22 - in the example that of FIG. 5 - for the production of false twists. For this purpose, the suction strap 38 has a perforation 23 in the form of two rows of suction openings 24 which are spaced next to one another, by means of which two at the respective work station of two

11 Roving bobbins 67 running and stretched in the drafting unit 1 and fiber slivers 8, 8 'delivered side by side by the pair of output rollers 4 are still compressed separately. After these compressed fiber slivers have run off the lower roller 40 of the compacting device 22, the two fiber slabs converge at the union point 68 and are twisted and wound into a false twist 66 by a ring spinning device 51 or a pot spinning device 58.

When producing false twist 66, two fiber lunches 8, 8 'are combined. As a rule, it is sufficient to add a core thread to only one of the fiber slivers to produce core yarn false twists. Therefore, only one core thread bobbin 11 is shown in FIG. 8, the core thread 12 of which runs to the right fiber sliver 8 '.

It goes without saying that the described and illustrated variants of the components of the spinning machine according to the invention, such as the indispensable ones - drafting device 1, compression device 22, rotating and winding device 51 or 58 - and the optional ones - like balloonless means of spinning fingers 64 and means for producing false twist 66 - can also be realized in combinations other than those described and illustrated.

12 List of reference numbers

1 drafting system

2 input rollers

3 pair of center rollers

4 output roller pairs', 3 ', 4' bottom rollers ", 3", 4 "top rollers

5 Elastic cover

6 load and load arm

7 straps

8, 8 'fiber fuse

9 Core thread supply plant

10 rolling rollers

11 core thread spool

12 core thread

13 core thread guide

14 roving insertion funnels

15 line of action

16 core thread cops

17 holding tube

18 suction roller (Fig. 1 to 3)

19 top roller

20 core thread guide roller

21 thread guide groove

22 compression device

23 perforation

24 suction openings

25, 26 bottom rollers

27 slips

28 suction chamber

29 Pipe, hose line

30 engine

31 suction pump

32 suction source 33 shield

13 34 compression zone

35 suction roller (Fig. 4)

36, 37 top rollers

38 suction straps (Fig. 5)

39 top roller

40 lower roller

41 suction straps (Fig. 6)

42 lower roller

43 lower drive roller

10 44 top roller

45 suction rotor

46 pressure roller

47 wave

48 pressure rollers

15 49 Tangential drive belts

50 lines of action

51 ring spinning device

52 spindle bench

53 spinning spindle

20 54 ring bench

55 spinning ring

56 ring travelers

57 thread guide

58 Pot spinning device

25 59 pot bench

60 spinning pot

61 thread guide tube

62 spider cake

63 core yarn

30 64 spinning fingers

65 thread tube

66 false twists

67 roving bobbins 68 Unification point

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Claims

Process and spinning machine for producing core yarn patent claims

1. A process for producing core yarn, in which a fiber sliver refined in a drafting system is passed through

Issue of twist is solidified, a core thread is fed, which is embedded in sheath fibers, characterized in that the fiber sliver is subjected to a compression after feeding the core yarn and before giving the rotation.

2. Spinning machine for producing core yarn with a drafting system that delivers at least one fiber sliver and with a device for supplying core yarn to the fiber sliver, characterized in that the drafting device (1) has at least one fiber sliver (8, 8 ') at its outlet. ) Compressing, circumferential, with a perforation (23) provided, under suction, compression device (22).

3. Spinning machine according to claim 2, characterized in that the core thread (12) is guided to the compression device (22) in such a way that the fiber sliver (8, 8 ') runs towards its inlet side.

15

4. Spinning machine according to claim 2, characterized in that the core thread (12) is guided around a core thread guide roller (20) assigned to the compression device (22) such that it is on the inlet side of the compression device of the fiber sliver (8, 8 ' ) approaches.

5. Spinning machine according to claim 2, characterized in that the compression device (22) has a circumferential suction unit (18, 35, 38, 41, 45), which is arranged in the center around its circumference with a perforation (23) in the form of a line smaller Has suction openings (24) and in the interior of which is arranged a suction chamber (28) which is under suction and through which the effect of the suction is limited to a compression zone (34) of the suction unit which faces the fiber run.

6. Spinning machine according to claim 5, characterized in that the suction unit is designed as a suction upper roller (18) which rests on at least one driven lower roller (25, 26). (Fig. 1 to 3)

7. Spinning machine according to claim 5, characterized in that the suction unit is designed as a driven suction lower roller (35) on which at least one upper roller (36, 37) rests. (Fig. 4)

8. Spinning machine according to claim 5, characterized in that the suction unit is designed as a suction strap (38) which is guided around the top roller (39) of a pair of rollers (39, 40). (Fig. 5)

16

9. Spinning machine according to claim 5, characterized in that the suction unit is designed as a suction strap (41) which is guided around a lower roller (42) of a roller trio (41, 43, 44). (Fig. 6)

10. Spinning machine according to claim 5, characterized in that the suction unit is designed as a rotating suction rotor (45), the level of its perforation (23) is at least approximately in a plane which the rollers (4 ', 4 ") of the pair of output rollers (4) tangent in their clamping line. (Fig. 7)

11. Spinning machine according to claim 2, characterized in that the compression device (22) for producing false twine (66) is equipped with a double-track perforation (23) with two parallel rows of small suction openings (24). (Fig. 8)

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