CN111411428A

CN111411428A - Stretching device of spinning machine

Info

Publication number: CN111411428A
Application number: CN202010026889.6A
Authority: CN
Inventors: G·沙夫勒; G·斯塔莱克
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2019-01-11
Filing date: 2020-01-10
Publication date: 2020-07-14
Anticipated expiration: 2040-01-10
Also published as: EP3680372A1; EP3680372B1; DE102019100603A1; CN111411428B

Abstract

A drawing device (1) for spinning machines, comprising a pair of rollers (2,3,4) able to draw in between at least one composite fibre material (5), and an oscillating device (6) in turn comprising an oscillating element (7) able to oscillate in its axial direction (X) with respect to the pair of rollers, and at least one thread guide (8) which allows the oscillation of at least one composite fibre material by the oscillation of the thread guide; the stretching device also comprises a pressing device (9) and at least one bracket (23, 24). In the invention, the oscillating element is arranged on the at least one support in such a way that the at least one thread guide is moved in the axial direction (X) relative to the oscillating element by an oscillating movement on the at least one support, so that the at least one thread guide (8) is aligned in the axial direction (X) relative to the pressing device (9).

Description

Stretching device of spinning machine

Technical Field

The invention relates to a drawing device (Streckwerk) for a spinning machine, comprising a pair of rollers (Walzenpaare) through which at least one composite fibre material (FaserverBunnd) can be passed and drawn, an oscillation device (Changiervorticichung) comprising an oscillation element (Changierement) and at least one thread guide (Faserf ü hr), wherein the at least one thread guide can guide the composite fibre material distributed to the thread guide, the oscillation element can oscillate in the axial direction of the roller pair relative to the roller pair, the at least one thread guide is arranged on the oscillation element, so that the at least one composite fibre material oscillates by the oscillating movement of the thread guide distributed with the composite fibre material, a compacting device for compacting the composite fibre material drawn from the roller pair, and at least one holder for accommodating the pair of rollers, the oscillation device and/or the compacting device.

Background

DE 102015117938 a1 discloses a drawing device for a textile machine, which drawing device comprises a pair of rollers for drawing a composite fibre material. The drawing device also comprises a pressing device (Verdichtungseteinrichtung) for compressing the drawn composite fibre material. In addition, the composite fiber material and the roller pair move relatively through an oscillating device (Changiervorticichtung). A disadvantage of such a drawing device is that the positioning of the thread guides of the oscillating device relative to the hold-down device can be cumbersome.

Disclosure of Invention

It is an object of the present invention to improve upon the prior art. This object is achieved by a stretching device according to the independent claim.

Preferably, the drawing device for a spinning machine according to the invention comprises a roller pair, between which at least one composite fiber material can be guided out and drawn. The composite fibre material is drawn and homogenized by means of a pair of rollers. The roller pair has an axial direction about which it is rotatable. The axial direction of the roller pair is preferably the drawing direction of the drawing device.

In addition, the above-mentioned drawing device is also provided with an oscillating device comprising an oscillating element and at least one yarn guide. The at least one yarn guide may guide the composite fiber material assigned to the yarn guide. When there are multiple yarn guides and composite fiber material, one yarn guide dispenses one composite fiber material.

In order to prevent composite fibre material from cutting into the roller pair and thereby extend the service life of the roller pair, the oscillatory member is subjected to an oscillatory movement in its axial direction relative to the roller pair. At least one guide is mounted on the oscillating element, so that the composite fibre material is oscillated in the axial direction thereof with respect to the roller pair by means of the guide. Thus, the roller pair loses in this process not a region of concentrated small area, but rather a relatively large area associated with the oscillating motion.

Likewise, the drawing apparatus of the present invention is provided with a pressing device by which the composite fiber material drawn out from the rolls can be compressed. The composite fibre material is compacted so that it is stronger.

In addition, the stretching device is also provided with at least one bracket, and at least a roller pair is arranged on the bracket. In addition or as an alternative, the oscillation device can also be mounted on at least one support. In addition or as an alternative, the holding-down device can also be mounted on at least one of the supports. It is also possible to mount parts of the unit on a support.

According to the invention, the oscillating device is arranged on the carrier, and the at least one thread guide is axially displaced on the at least one carrier relative to the oscillating element with an oscillating movement. In this way, the at least one yarn guide can be aligned in the axial direction with respect to the hold-down device. For example, the at least one yarn guide may be urged to move on the carrier by an oscillating movement and on the carrier when the oscillating movement is not stopped. The yarn guide itself may simply move relative to the oscillating element. The carrier pushes the thread guide towards the oscillating element until the direction of the oscillating movement changes, the thread guide again being able to leave the carrier. For example, the oscillating device and/or the oscillating element are mounted on the support at intervals in the axial direction, so that at least a part of the oscillating device can be pushed to move on the support by the oscillating movement.

Since the support itself is immovable or fixed, the support is preferably used as a spatial reference point in the stretching device, in particular in the axial direction. For the holder, the yarn guides and thus also the composite fibre material are axially aligned, so that the drawing device can handle the composite fibre material in an advantageous manner. Thus, the at least one yarn guide is axially aligned relative to the hold-down device, thereby also aligning the composite fiber material with the hold-down device.

If the yarn guides are misaligned, for example misaligned with the hold-down device, the position of the yarn guides and thus of the composite fibre material must be corrected. For example, due to thermal expansion and contraction of the oscillating element, it is possible to cause the at least one yarn guide mounted on the oscillating element to move axially so that it is no longer aligned with the hold-down device. However, if the thermal expansion deformation causes the at least one yarn guide to move axially, this extends through the entire oscillating movement of the at least one carrier and, in the following oscillating movement, also moves relative to the oscillating element. In this case, the yarn guides are not aligned with the hold-down device and the displacement is wrong and needs to be calibrated.

This design is advantageous in that at least one guide is mounted on the oscillating element, which will transmit an oscillating movement to the composite fibre material dispensed, which can be axially displaced when it is stranded (autoflaufen) on at least one support for calibration. The at least one thread guide is therefore arranged on the oscillating element in such a way that an axial oscillating movement can be transmitted to the at least one composite fibre material. In one aspect, the at least one yarn guide is not loosely connected to the oscillating member such that the at least one yarn guide moves the composite fiber material through it toward the oscillating member; on the other hand, the at least one yarn guide is not firmly connected to the oscillating element, otherwise the composite fibre material cannot be moved towards the oscillating element by the oscillating movement when it is resting on the support.

This embodiment is advantageous in that the holding-down device is provided with a suction tube (Saugrohr) with at least one suction groove (saugrlitz). The interior of the pipette is evacuated. If the composite fiber material passes through the suction groove, the composite fiber material is sucked and compacted. In addition, the suction groove is inclined towards the running direction of the composite fiber material, so that the composite fiber material can be sucked into the suction groove in a wider area. Thus, when the composite fiber material oscillates, the composite fiber material is also sucked into the suction groove. Of course, the composite fibre material must be aligned with the suction slot, since the composite fibre material will at least occasionally be beside the suction slot during the oscillation. It is also advantageous if at least one thread guide is aligned with the suction slot.

This is advantageous in that the suction tube is at least axially fixed to the holder. In this way, the pipette remains fixed with respect to at least one of the racks, so that when at least one of the yarn guides is aligned with the rack, it is automatically also aligned with the pipette, and with at least one of the suction slots. Thus, at least one of the yarn guides can be aligned with its assigned suction slot.

This embodiment is advantageous if the drawing device has a plurality of, in particular eight, yarn guides, wherein a composite fibre material is assigned to each yarn guide and preferably a suction channel is assigned to each composite fibre material by the suction pipe. The number of yarn guides, the number of composite fibre materials and the number of suction slots are always the same. Each yarn guide leads out a composite fiber material which passes through the suction groove. The suction channel can also be replaced by other pressing elements, such as a pressing funnel. By means of a plurality of yarn guides, a plurality of composite fibre materials can be treated simultaneously. The advantages of such a stretching device are also substantially described before. For example, the length of the roller pair is designed so that eight composite fiber materials can be simultaneously stretched. Thus, the length of the straw is also a design consideration.

If the drawing device is equipped with a plurality of thread guides, their spacing from one another corresponds to the spacing between the suction slots and/or other pressing elements.

The guide rail and the at least one yarn guide (i.e. the plurality of yarn guides) may be mounted on the oscillating element as a unit and dismounted as a unit.

Preferably, the at least one thread guide and/or guide rail is arranged on the oscillating element by means of at least one connection (koppel element). By means of the connecting piece, the at least one thread guide and/or the guide rail can also be spaced apart from the oscillating element.

Such a design is advantageous in that by means of the adjusting device the fastening strength of the at least one thread guide on the guide rail can be adjusted and/or the fastening strength of the guide rail on the oscillating element can be adjusted and/or the fastening strength of the at least one thread guide on the oscillating element can be adjusted. The adjusting device can be arranged on the thread guide, on the connecting piece, on the guide rail and/or on the oscillating element. For example, the adjustment means may comprise a threaded screw, the tightening of which may improve the fastening strength between the guide rail and the oscillating element. In this way, the guide rail, provided with at least one yarn guide, is difficult to move with respect to the oscillating element. Here, too, the fastening strength between the guide rail and the oscillating element does not have to be too strong, as long as the guide rail does not displace from the holder on the oscillating element, in order to calibrate the yarn guide. However, the fastening strength described above should not be too weak, otherwise the yarn guide cannot transfer the oscillating movement to the composite fibre material. However, during operation or during the adjustment phase of the stretching device, a suitable fastening strength can easily be found by means of the adjusting device.

This embodiment is advantageous in that the at least one thread guide is fixedly arranged on the guide rail, and the guide rail is axially displaceable relative to the oscillating element. The spatial relationship between the at least one yarn carrier and the guide track is maintained fixed so that the guide track need only be moved on the carriage to align the at least one yarn carrier. This has the particular advantage that a plurality of yarn guides are provided on the guide rail, which allows all the yarn guides to be aligned simultaneously.

Such a design is advantageous in that the connection between the coupling piece and the oscillatory member and/or the guide rail and/or the thread guide is effected by a slip clutch (Rutschkupplung). The slip clutch is designed such that, during oscillation, the composite fibre material in the at least one thread guide is not displaced relative to the oscillating element. However, at least one of the yarn guides is displaced relative to the oscillating element by the carrier.

This embodiment is advantageous in that the connecting element is arranged on the oscillating element and/or the guide rail by means of at least one spring element. The connecting element can be pressed against the oscillating element and/or the guide rail by means of at least one spring element. Preferably, the spring strength is selected such that the yarn guides on the carrier are aligned but the composite fiber material of the yarn guides is not displaced in the axial direction upon oscillation.

For example, the oscillating element has a floating bearing (L oslager) for mounting the oscillating element, so that the oscillating element can move in the axial direction but cannot move in the radial direction.

Preferably, the stretching device is provided with a first bracket and a second bracket axially spaced therefrom. Thus, the components of the stretching device are arranged at two points so that they do not rotate. Preferably, a roller pair, an oscillating device and/or a pressing device, in particular a suction tube, is mounted between the two supports. The two brackets thus define the stretching device between the two faces in the axial direction. The space formed by the two opposite sides of the bracket is the mounting area or punching area (Stanzenfeld) of the stretching device.

The length of the guide rail and the length of the oscillation stroke of the oscillating movement correspond to the distance between the bearing centers of the two opposite inner faces of the two carriages (L agenabstand). The oscillation stroke corresponds to the movement of the oscillating movement between the two turning points.

Such a design is advantageous in that the first distance between the first end point of the guide rail and its corresponding first support at the middle of the suction slot where the composite fibre material is distributed is half the oscillation stroke. Additionally or alternatively, the second distance between the second end of the guide rail and the corresponding second support at the middle position of the suction slot to which the composite fibre material is distributed is also half of the oscillation stroke. The middle position of the composite fiber material is just the middle position of the axial outward movement of the suction groove.

This is advantageous if a fork element with an axial recess is mounted on at least one of the supports, and a plug is mounted at the end of the rail facing the fork element, which element projects into the recess and can be displaced therein during the oscillating operation. In this way, at least one yarn guide can be accurately aligned with the hold-down device.

Such a design is advantageous in that the width of the axial groove corresponds to the sum of the oscillation stroke length of the oscillatory movement and the plug width of the plug. Thus, the two turning points of the oscillating movement are the two inner sides of the groove. The plugs alternately hit two inner turning points.

The advantages of the invention will be further described below by means of specific embodiments.

Drawings

FIG. 1 is a side view of a drawing device of a spinning machine;

FIG. 2 is a top view of a drawing apparatus having two composite fiber materials;

FIG. 3 is a partial top view of a drawing apparatus having two composite fiber materials, with two brackets provided;

FIG. 4 is a schematic view of a stretching assembly having a fork member mounted on a carriage and a plug mounted on a rail;

FIG. 5a is a sectional view showing the oscillation element and the attached guide rail;

fig. 5b is a cross-sectional view of the oscillatory member showing the guide rail attached thereto.

Detailed Description

Fig. 1 shows a side view of a drawing device 1 of a spinning machine, the drawing device 1 includes roller pairs 2,3,4, a composite fiber material 5 passes through the middle of the roller pairs, the drawing device draws the composite fiber material 5, after the roller pairs 2,3,4 are operated, the composite fiber material 5 is drawn out by the drawing device 1 in an operation direction L R, the composite fiber material 5 is drawn and deformed due to a speed difference of the roller pairs 2,3,4 in an operation direction L R, thereby homogenizing the composite fiber material 5.

The drawing apparatus 1 is equipped with an oscillation device 6 which oscillates the composite fibre material 5 in the axial direction X of the roller pairs 2,3,4, not shown here. Thus, the working contact surfaces of the roller pairs 2,3,4 are widened, thereby avoiding the composite fiber material 5 from cutting into the roller pairs 2,3, 4.

The oscillation device 6 is provided with an oscillation element 7 (see below) not shown here and at least one thread guide 8. The yarn guide 8 feeds the composite fibre material 5 into the drawing device 1 so that it travels between the roller pairs 2,3, 4. By means of the at least one yarn guide 8, the composite fibre material 5 also starts an oscillating movement. For example, the yarn guide 8 may be a funnel, and the yarn guide 8 guides the composite fiber material 5 in a cross-sectional direction (cross-direction) of the composite fiber material 5.

In this embodiment, a hold-down device 9 is installed behind the roller pairs 2,3,4 in the direction L R of travel of the composite fiber material 5. the composite fiber material 5 is consolidated by the hold-down device 9 to provide it with greater strength.

In addition, in this embodiment, the pressing device 9 has a suction pipe 10, and the suction pipe 10 has at least one suction groove 11. The suction pipe 10 is evacuated, and when the composite fiber material 5 passes through the suction groove 11, it is sucked into the suction groove and is compressed.

In the direction of travel L R of the composite fibre material 5, downstream of the pressing device 9, a spinning unit 12 is arranged, which winds the yarn emerging from the composite fibre material 5 onto a package 13. in this embodiment, the spinning unit 12 is a rotating body, which may also be another type of spinning unit.

According to the present embodiment, the stretching apparatus 1 is provided with a pair of belts including an upper belt 14 and a lower belt 15. in addition, the upper belt 14 is turned by a turning unit 16. the lower belt 15 is turned by a turning table 17 and a turning lever 18. according to the present embodiment, a belt set is installed between the first roller pair 2 and the second roller pair 3. additionally or alternatively, the belt set may be installed behind the third roller set 4 in the traveling direction L R of the composite fiber material 5.

Further, generally, the

lower rollers

2b, 3b, 4b of the roller pairs 2,3,4 are driven so that the composite fiber material 5 is stretched by the stretching device 1. The

upper rollers

2a, 3a, 4a of the roller pairs 2,3,4 are not driven, are located above the

lower rollers

2b, 3b, 4b, rotate together with them and are pressed.

The stretching device 1 is also provided with a clamping roller 19 which in this embodiment presses the composite fibre material 5 against the suction tube 10 as shown.

In the present embodiment, the upper belt 14 is installed around the upper roller 3a of the second roller pair 3, and the lower belt 15 is installed around the lower roller 3b of the second roller pair 3.

The stretching unit 1 further comprises a pressure arm 20, on which the

upper rollers

2a, 3a, 4a and the clamping roller 19 are mounted in this embodiment. The pressure arm 20 can be pivoted upward with respect to the

lower rollers

2b, 3b, 4b for removing components or for introducing the composite fibre material 5 into the drawing device 1. If a component is replaced or a fibre composite material 5 is inserted, the pressure arm 20 can be pivoted downwards again, so that the

upper rollers

2a, 3a, 4a are fixed to the

lower rollers

2b, 3b, 4 b.

In the following description of the figures, parts of the same type and/or of the same function, even those of a comparable type and function, are given the same reference numerals as in the figures described above. If not specifically mentioned again in the following embodiment examples or in the figures, this means that the design and/or operation thereof corresponds to the design and/or operation features already described above in the other embodiment examples.

Fig. 2 shows a partial plan view of the drawing device 1, which can draw at least two

composite fibre materials

5a, 5b, as shown. However, the drawing device 1 can twist only one composite fiber material 5.

In addition, the stretching apparatus 1 of the present embodiment is opened. This means that the pressure arm 20 is swung down from the

lower rollers

2b, 3b, 4 b. Thus, fig. 2 illustrates a view onto the

lower rollers

2b, 3b, 4b, with the

composite fibre material

5a, 5b just above the lower rollers.

The

lower rollers

2b, 3b, 4b and preferably also the

upper rollers

2a, 3a, 4a described here and the clamping roller 19 can axially cover the entire stretching unit 1. The stretching device 1 therefore has only one

lower roller

2b, 3b, 4b,

upper roller

2a, 3a, 4a and clamping roller 19. The stretching apparatus 1 may also expand a plurality of composite fiber materials 5 at the same time. The design of such a drawing device 1 has the advantage that it means that the length in the axial direction X is so long that 8 composite fibre materials 5 can be drawn. Of course 8 yarn guides 8, 8 lower belts 15, 8 upper belts 14, 8 suction slots 11 and 8 spinning cylinders 12 are also required.

In the present embodiment, the oscillation device 6 is provided with an oscillation element 7 on which wire guides 8a, 8b are mounted. The oscillating element 7 may be driven by a driver not described here. The oscillation element 7 performs an oscillation movement CB which is advantageous in that it is parallel to the axial direction X of the

roller pair

2,3, 4. The oscillating motion CB is a back-and-forth motion. By oscillating the

composite fibre materials

5a, 5b dispensed by the yarn guides 8a, 8b together, the

composite fibre materials

5a, 5b are caused to travel in the middle of the roller pair over a relatively wide range, thereby avoiding the

composite fibre materials

5a, 5b cutting into the

rollers

2a, 2b, 3a, 3b, 4a, 4b of the roller pairs 2,3, 4.

The oscillating movement CB additionally has a first return point 21 and a second return point 22. The distance between the two

turning points

21, 22 is the oscillation stroke CH or the oscillation stroke length CH. For the sake of clarity, only the

turning points

21, 22 and the oscillation stroke CH on the composite fibre material 5a are shown in the figure. The

composite fibre material

5a, 5b oscillates back and forth between the two

turning points

21, 22.

The

suction slots

11a, 11b each have an intermediate point M which passes through the centre of the axial direction X of the

suction slots

11a, 11 b. When the

turning points

21, 22 are at equal distances in the axial direction X from the middle position M of the

suction slots

11a, 11b, the

composite fibre materials

5a, 5b and their assigned

suction slots

11a, 11b are optimally aligned. The

composite fibre material

5a, 5b is then oscillated evenly, i.e. kept at the same distance from both sides around the middle position M. The

composite fibre material

5a, 5b is thus optimally aligned with its assigned

suction slot

11a, 11b, i.e. if the

composite fibre material

5a, 5b oscillates about the middle position M of the

suction slot

11a, 11b, it is ensured that it is always in the

suction slot

11a, 11b during the oscillation of the

composite fibre material

5a, 5 b. In particular, the

composite fiber materials

5a, 5b do not oscillate in the areas beside the

suction grooves

11a, 11 b.

However, due to the thermal expansion of the oscillating element 7, the yarn guides 8a, 8b may move axially, so that these elements are no longer optimally aligned with the hold-down device 9 (in particular the

suction grooves

11a, 11 b). The

composite fiber materials

5a, 5b no longer oscillate uniformly at the intermediate position of the

suction grooves

11a, 11 b. In particular, one of the two

turning points

21, 22 may be located beside the

suction slot

11a, 11b in the axial direction X, which has the disadvantage that the

composite fibre material

5a, 5b is no longer compacted.

Another drawback is that the yarn guides 8a, 8b must be mounted relatively precisely in the axial direction X, which raises certain difficulties in assembly.

Fig. 3 shows a part of the stretching apparatus 1, in which there are two

composite fibre materials

5a, 5b and in this embodiment also two

supports

23, 24. The stretching apparatus 1 may be provided with only one of the

brackets

23, 24.

In the following description of the figures, parts of the same type and/or of the same function, even those of a comparable type and function, are given the same reference numerals as in the figures described above. If not specifically mentioned again in the following embodiment examples or in the figures, this means that the design and/or operation thereof corresponds to the design and/or operation features already described above in the other embodiment examples. Furthermore, for the sake of simplicity, only the labels important for understanding are given.

The oscillating device 6 is mounted on at least one

support

23,24, and at least one

thread guide

8a, 8b is movable on at least one

support

23,24 in the axial direction X relative to the oscillating element 7 by an oscillating movement CB, so that at least one

thread guide

8a, 8b can be aligned with the hold-down device 9 in the axial direction X. According to this embodiment, at least one

yarn guide

8a, 8b is aligned with the assigned

suction slot

11a, 11 b. This has the advantage that the

composite fibre material

5a, 5b oscillates uniformly all the way around the mid-point M of the

suction slot

11a, 11 b. If the

composite fibre material

5a, 5b oscillates uniformly around the middle position M of the

suction slot

11a, 11b, the two

turning points

21, 22 are at equal distances from the middle point M.

The

lower rollers

2b, 3b, 4b on the two

brackets

23,24 in this embodiment are rotatable. In addition or as an alternative, the suction tube 10 of the holding-down device 6 is mounted on the

supports

23, 24. The

suction grooves

11a, 11b of the suction pipe 10 are thus kept at a distance from the

holders

23, 24. The

brackets

23,24 can thus serve as reference points for the stretching device 1.

Both supports 23,24 each have a floating

bearing

32, 33, so that the oscillating element 7 can move freely in the axial direction X, but the oscillating element 7 is guided in the radial direction into the floating

bearings

32, 33. For example, the two floating

bearings

32, 33 may serve as holes in the

brackets

23, 24. The frictional resistance between the oscillatory member 7 and the two floating

bearings

32, 33 should not be so great that the oscillatory member 7 can oscillate with a slight force, in particular a tensile force.

In addition, the

inner sides

30, 31 of the two

brackets

23,24 are opposite. In addition, a certain distance a is maintained between the

inner sides

30, 31 of the two

brackets

23, 24. Thus, the bracket distance a is the distance between the two

brackets

23, 24.

According to this embodiment, the oscillating device 6 is provided with a guide rail 25 on which at least one

thread guide

5a, 5b is mounted.

In addition, the guide rail 25 has a first end point 28 and a second end point 29. The first end 28 faces the first bracket 23 and the second end 29 faces the second bracket 24.

The guide rail 25 is mounted on the oscillating element 7 by means of at least one

connection

26, 27. In this embodiment, the guide rail 25 is mounted on the oscillating element 7 by means of two

connections

26, 27. Thereby, the guide rail 25 does not rotate unnecessarily facing the oscillation element 7.

According to this embodiment, the thread guides 8a, 8b are aligned with the

suction slots

11a, 11 b. The thread guides 8a, 8b oscillate at equal distances around the middle position M of the

suction slots

11a, 11b to both sides. This means that the oscillating movement CB has the same distance of the two

turning points

21, 22 to the central position M. The distance between the

turning points

21, 22 to the intermediate position M is thus half the oscillation stroke CH or its length.

The length of the guide rail 25 in the axial direction X is L. the distance a of the

carriages

23,24 from the carriage, the distance of the oscillation stroke CH and the length L of the guide rail 25 all preferably have a relationship, which is advantageous in that the sum of the length L of the guide rail 25 and the length CH of the oscillation stroke is equal to the carriage distance a of the

carriages

23, 24.

If the above relationship applies, the first end point 28 of the guide rail 25 impinges on the first inner side 30 of the first support 23 during the oscillating movement CB and when the

composite fibre material

5a, 5b is located at the first turning point 21. Conversely, when the oscillating movement CB and the

composite fibre materials

5a, 5b are at the second turning point 22, the second end point 29 of the guide rail 25 then impinges on the second inner side 31 of the second holder 24.

If the yarn guides 8a, 8b oscillate exactly around the middle point M, there is a first distance a1 between the first end 28 of the guide rail 25 and the first inner side 30 of the first leg 23. The first distance a1 is half of the oscillation stroke CH or half of the path of the oscillation stroke CH.

If the yarn guides 8a, 8b oscillate exactly around the middle point M, the distance between the second end 29 of the guide rail 25 and the second inner side 31 of the second leg 24 is a distance a 2. The second distance a2 is half of the oscillation stroke CH or half of the path of the oscillation stroke CH.

If the thread guides 8a, 8b are aligned with the hold-down device 9, in particular the

suction grooves

11a, 11b, the two distances a1 and A2 of the two ends 28,29 of the guide rail 25 to the

inner sides

30, 31 designated by the two

brackets

23,24 are the same.

If, for example, the oscillating element 7 now expands or pulls together due to thermal expansion, the yarn guides 8a, 8b are displaced in the axial direction X relative to the hold-down device 9. The yarn guides 8a, 8b can be moved in the direction of the first carrier 23 or in the direction of the second carrier 24. One of the

turning points

21, 22 will leave the central position M. In the worst case, one of the two

turning points

21, 22 is displaced to the side of the

suction slots

11a, 11 b.

For example, if the first distance a1 is smaller than the second distance a2, the guide rail 25 is displaced toward the first bracket 23 due to thermal expansion, the first end point 28 of the guide rail 25 hits the first inner side 30 of the first bracket 23 by the oscillating movement CB, which has not yet reached the first turning point 21. The oscillation movement CB continues to travel in the corresponding direction after the impact. However, one inventive idea of the present invention is that in this embodiment, while the guide 25 is waiting on the first inner side 30 of the first support 23, the guide 25 is moved in the axial direction X towards the oscillating element 7, which movement takes place until the oscillating movement CB reaches the first turning point 21 and is moved away from the first support 23 again. By means of the oscillating movement CB, the guide rail 25 is moved towards the second carriage 24 until the oscillating movement CB reaches the second turning point 22. At this time, the second end point 29 of the guide rail 25 hits the second inner side 31 of the second bracket 24. Furthermore, the guide rail 25 may be aligned with the second inner side 31 if the second end point 29 after impacting the second inner side 31 has not yet reached the second turning point 22 of the oscillating movement CB.

Fig. 4 shows a further embodiment of the stretching assembly 1, in which the fork element 34 is mounted on the carriage 24, here the second carriage 24, and the spigot 36 is mounted on the guide 25.

The fork element 34 is mounted on the inner side 31 of the second bracket 24 and extends therefrom in the axial direction X. In addition, the fork element 34 has an axial groove 35, limited in the axial direction X by two

detent points

37, 38.

The guide rail 25 is furthermore provided with a plug 36 which projects into the recess 35 and is arranged in particular between two

detent points

37, 38. The plug 36 is in this embodiment mounted at the second end 29 of the rail 25.

Advantageously, the width B of the recess 35 in the axial direction X corresponds to the sum of the plug width 36 of the plug 36 in the axial direction X and the length of the oscillation stroke CH. Thus, if the thread guides 8 are aligned with the suction slots 11, the plugs 36 strike the stop points 37, 38 at the

turning points

21, 22 of the oscillating movement CB. On the other hand, if the yarn guide 8 is not aligned with the suction slot 11, neither of the plugs 36 reaches the

respective turning point

21, 22 when it hits the

braking point

37, 38. After striking the braking points 37, 38, the guide rail 25 continues to move towards the oscillating element 7 until the thread guides 8 are again aligned with the suction slots 11.

Fig. 5a shows a cross section of the oscillating element 7 with coupled guide rails 25. The guide rail 25 is connected to the oscillating element 7 by means of connections 26,27 (see fig. 3, 4). The connecting

pieces

26,27 comprise in this embodiment a handle 39, which is mounted to the oscillating element 7 by means of screws 41. Thus, the connection between the handle 39 and the oscillation element 7 is firm. The

connectors

26,27 also comprise a spring element 40 which allows the guide 25 to move axially X towards the handle 39.

However, the spring element 40 has a strength such that, when the composite fiber material 5 in the yarn guide 8 oscillates, the guide rail 25 is not displaced toward the handle 39 and is displaced toward the oscillating element 7. On the other hand, the spring element 40 should be of suitable strength such that the guide rail 25 can be moved on at least one of the

supports

23,24 in order to align the thread guide 8 with the holding-down device 9. The spring element 40 in this embodiment presses the guide rail 25 from the inside onto the handle 39. The spring element 40 is so constructed that the guide rail 25 is pressed away from the oscillating element 7.

For example, the spring element 40 may be a leaf spring or a coil spring. The spring element 40 may also be an elastomer.

The handle 39, or at least the surface thereof, is preferably made of a wear resistant plastic and the guide rail 25 is attached to the surface of the handle 39 so that the handle 39 does not wear when the guide rail 25 is moved.

Fig. 5b shows another embodiment of the connection of the guide rail 25 on the oscillating element 7. In the present embodiment, the spring element 40 is a leaf spring and is firmly mounted on the oscillating element 7 by means of a screw 41. The spring element 40 presses the guide rail 25 towards the oscillating element 7. Between the guide rail 25 and the oscillating element 7 a stop 42 is mounted.

The invention is not limited to the embodiments described above, variations and combinations within the scope of the claims are relevant to the invention, which also includes references not made to the embodiments described above or to the embodiments individually marked.

Reference numerals

1 stretching device

2 first roller set

2a upper roller

2b lower roller

3 second roller set

3a upper roller

3b lower roller

4 third roller set

4a upper roller

4b lower roller

5 composite fiber material

6 oscillating device

7 Oscillating element

8 thread guide

9 pressing device

10 suction pipe

11 suction groove

12 spinning unit

13 spinning tube

14 upper skin band

15 lower belt

16 steering unit

17 turn to platform

18 steering rod

19 clamping roller

20 pressure arm

21 first turning point

22 second turning point

23 first support

24 second support

25 guide rail

26 first connecting piece

27 second connecting piece

28 first end point

29 second end point

30 first inner side

31 second inner side

32 first floating bearing

33 second floating bearing

34 fork element

35 groove

36 embolism

37 first stop point

38 second stopping point

39 handle

40 spring element

41 screw rod

42 stop block

L R running direction

CB oscillatory motion

X axial direction

CH radial direction

M midpoint

Distance of A support

A1 first distance

A2 second distance

L length

Width B

Width of Z plug

Claims

1. Stretching device (1) for spinning machines comprising:

a pair of rollers (2,3,4) between which at least one composite fibre material (5) can be passed and stretched;

oscillation means (6) further comprising an oscillation element (7) and at least one yarn guide (8), wherein said at least one yarn guide (8) is capable of guiding the composite fiber material (5) assigned to the yarn guide (8), said oscillation element (7) being capable of oscillating in its axial direction (X) with respect to said pair of rollers (2,3,4) upon an oscillating movement; wherein the at least one yarn guide (8) is arranged on the oscillating element (7) such that the at least one composite fibre material (5) is oscillated by an oscillating movement of the yarn guide (8) to which the composite fibre material (5) is assigned;

a compacting device (9) by means of which the composite fibre material (5) drawn off from the roller pairs (2,3,4) is compacted; and

at least one support (23,24) on which at least the roller pairs (2,3,4), the oscillating element (6) and/or the pressing device (9) are mounted;

it is characterized in that the preparation method is characterized in that,

the oscillating element (6) is arranged on the at least one support (23,24) in such a way that the at least one thread guide (8) is moved in the axial direction (X) relative to the oscillating element (7) by an oscillating movement on the at least one support (23,24) in such a way that the at least one thread guide (8) is aligned in the axial direction (X) relative to the pressing device (9).

2. Drawing device as in claim 1, characterized in that said at least one yarn guide (8) is arranged on said oscillating element (7) in such a way that said at least one yarn guide (8) is able to transfer an oscillating movement to the composite fibrous material (5) it dispenses and to move axially on said at least one carriage (23,24) for alignment when at rest.

3. Drawing device according to one of the preceding claims, characterised in that the pressing device (9) comprises a suction pipe (10) with at least one suction slot (11), wherein the at least one suction slot (11) is assigned a composite fibre material (5) by means of which the drawn composite fibre material (5) is pressed, and/or that the suction pipe (10) is fixed to a holder (23,24) at least in the axial direction (X) and that the at least one thread guide (8) can be aligned with the assigned suction slot (11).

4. Drawing device as in one of the previous claims, characterized in that the drawing device (1) has a plurality of yarn guides (8), in particular 8, wherein each yarn guide (8) is assigned a composite fiber material (5); preferably, the suction pipe (10) is provided with a suction groove (11) for each composite fiber material (5).

5. Stretching apparatus as in any claim hereinbefore, wherein said at least one yarn guide (8) is arranged on a guide (25) in turn arranged on the oscillating element (7); preferably, said oscillating element (7) and said guide rail (25) are parallel to each other.

6. Stretching apparatus as in any claim hereinbefore, wherein said at least one yarn guide (8) and/or said guide (25) are arranged on the oscillating element (7) by means of at least one connection (26, 27).

7. Stretching apparatus as in any claim hereinbefore, wherein the fastening strength of said at least one yarn guide (8) on said guide rail (25), and/or the fastening strength of said guide rail (25) on said oscillating element (7), and/or the fastening strength of said at least one yarn guide (8) on said oscillating element (7) is adjusted by means of a mounting device.

8. Stretching apparatus as in any claim hereinbefore, wherein said at least one yarn guide (8) is fixedly arranged on said guide (25), said guide (25) being movable in the axial direction (X) with respect to said oscillating element (7).

9. Stretching apparatus as in any claim hereinbefore, wherein the connection between said connecting elements (26,27) and said oscillating element (7) and/or said guide rail (25) and/or said yarn guide (8) is achieved by means of a slip clutch.

10. Stretching apparatus as in any claim hereinbefore, wherein said connecting means (26,27) are provided on said oscillating element (7) and/or on said guide rail (25) by means of at least one spring element (40).

11. Stretching apparatus as in any claim hereinbefore, wherein said oscillating element (7) is itself movable in an axial direction (X) with respect to said at least one support (23, 24).

12. Stretching apparatus as in any claim hereinbefore, wherein said stretching apparatus (1) comprises a first support (23) and a second support (24) spaced apart in the axial direction (X); preferably, the roller pair (2,3,4), the oscillation device (6) and/or the pressing device (9), in particular the suction tube (10), are/is arranged between the two supports (23, 24).

13. Stretching apparatus as in any claim hereinbefore, wherein the sum of the length (L) of said guide (25) and the oscillation stroke length (CH) of the oscillating movement corresponds to the bearing centre distance (A) between the opposite inner sides of the two supports (23, 24).

14. Stretching apparatus as in any claim hereinbefore, wherein at the midpoint position (M) of the suction slot (11) to which the composite-fibre material (5) is assigned, the first distance (A1) between the first end point (28) of the guide (25) and its corresponding first support (23) is half of the oscillation stroke (CH) and/or the second distance (A2) between the second end point (29) of the guide (25) and its corresponding second support (24) is half of the oscillation stroke (CH).

15. Stretching apparatus as in any claim hereinbefore, wherein a fork element (34) with an axial (X) recess (35) is provided on said at least one support (23, 24); at the ends (28,29) of the guide rail (25) which the fork element (34) faces, a plug (36) is provided which projects into the recess (35) and can be displaced in the recess (35) during an oscillating movement.

16. Stretching apparatus as in any claim hereinbefore, wherein said groove (35) has an axial (X) width (B) corresponding to the sum of the length of the oscillation stroke (CH) of the oscillating movement and the axial (X) plug width (Z) of said plug (36).