EP3680372A1 - Drawing frame of a spinning machine - Google Patents

Abstract

The invention relates to a drafting system (1) of a spinning machine with pairs of rollers (2, 3, 4) between which at least one fiber composite (5) can be carried out and stretched, with a traversing device (6) which has a traversing element (7) and at least one Fiber guide (8), wherein the at least one fiber guide (8) can guide a fiber composite (5) assigned to the fiber guide (8), the traversing element (7) in a traversing movement (CB) relative to the pairs of rollers (2, 3, 4) is changeable in its axial direction (X) and the at least one fiber guide (8) is arranged on the traversing element (7), so that the at least one fiber composite (5) by means of the traversing movement (CB) of the fiber guide (5) assigned to the fiber composite (5) 8) can be oscillated, with a compacting device (9), by means of which the fiber composite (5), which is completely drawn by the pairs of rollers (2, 3, 4), can be compacted, and with at least one bearing in which at least the pairs of rollers (2, 3rd , 4), the traversing device (6) and / or the compression device (9) are mounted. According to the invention, the traversing device (6) is arranged for at least one bearing (23, 24) in such a way that the at least one fiber guide (8) by means of the traversing movement (CB) on the at least one bearing (23, 24) in the axial direction (X) relative to the Traversing element (7) is displaceable, so that the at least one fiber guide (8) can be aligned in the axial direction (X) with respect to the compression device (9).

Description

The present invention relates to a drafting system of a spinning machine with pairs of rollers, between which at least one fiber composite can be carried out and stretched, with a traversing device which comprises a traversing element and at least one fiber guide, wherein the at least one fiber guide can guide a fiber composite assigned to the fiber guide, the Traversing element in a traversing movement in relation to the roller pairs in the axial direction thereof, and wherein the at least one fiber guide is arranged on the traversing element, so that the at least one fiber composite can be traversed by means of the traversing movement of the fiber guide assigned to the fiber composite, with a compression device by means of which the drawn fiber composite can be compressed, and with at least one bearing in which at least the roller pairs, the traversing device and / or the compression device are mounted.

From the DE 10 2015 117 938 A1 a drafting system of a spinning machine is known. The drafting system comprises pairs of rollers in order to be able to stretch a fiber composite. In addition, the drafting system has a compression device, by means of which the fiber composite is compressed. Furthermore, the fiber composite is oscillated relative to the roller pairs by means of a traversing device. A drawback of such a drafting arrangement is that it is only possible to align fiber guides of the traversing device with respect to the compression device.

The object of the present invention is therefore to improve the prior art.

The object is achieved by a drafting system with the features of the independent claim.

A drafting system of a spinning machine with pairs of rollers between which at least one fiber composite can be carried out and stretched is proposed. With the help of the pairs of rollers, the fiber composite is warped, whereby it is homogenized. The pairs of rollers have an axial direction about which they can rotate. The axial direction of the roller pairs is preferably used as the reference direction in the drafting system.

Furthermore, the drafting system has a traversing device which comprises a traversing element and at least one fiber guide. The at least one fiber guide can guide a fiber composite assigned to the fiber guide. A fiber composite is therefore assigned to a fiber guide if there are several fiber guides and fiber composites.

In order to prevent the fiber composite from cutting into the roller pairs and thus to extend the durability of the roller pairs, the traversing element is oscillated in an axial movement relative to the roller pairs. The at least one fiber guide is arranged on the traversing element, so that with the aid of the at least one fiber guide, the fiber composite is also traversed in the axial direction with respect to the roller pairs. As a result, the roller pairs are not only worn in a small area, but are also loaded over a relatively wide area, corresponding to the traversing movement.

Likewise, the drafting system has a compression device, by means of which the fiber composite which is already warped by the pairs of rollers can be compressed. The fiber composite is thereby compacted so that it has a higher strength.

The drafting system also has at least one bearing in which at least the roller pairs are supported. Additionally or alternatively, the traversing device can also be mounted in the at least one bearing. In addition or alternatively, the compression device can also be stored in the at least one bearing. Parts of the units mentioned can also be stored in the at least one bearing.

According to the invention, the traversing device is arranged for storage in such a way that the at least one fiber guide can be displaced in the axial direction relative to the traversing element by means of the traversing movement on the at least one bearing, so that the at least one fiber guide can be aligned in the axial direction with respect to the compression device. For example, the at least one fiber guide can strike the bearing due to the traversing movement and can be moved on the bearing when the traversing movement has not yet ended. The fiber guide can then only move relative to the traversing element. The storage thus moves the fiber guide relative to the traversing element. The shifting takes place until the traversing movement is reversed and the fiber guide thereby moves away from the storage again. For example, the traversing device and / or the traversing element is arranged at a distance from the bearing in the axial direction, so that at least a part of the traversing device can strike the bearing due to the traversing movement.

The bearing advantageously serves as a spatial reference point, in particular in the axial direction, in the drafting system, since the bearing itself is immobile or is stationary. For storage, the fiber guide is aligned in the axial direction, as a result of which the fiber composite is also aligned in the axial direction in order to be able to process the fiber composite in an advantageous manner through the drafting system. As a result, the at least one fiber guide is aligned with the compression device in the axial direction, so that the fiber composite is also aligned with the compression device.

Alignment of the fiber guide and thus the fiber composite is of course necessary if the fiber guide is not, for example to the compression device, is aligned. For example, a heat-related expansion or contraction of the traversing element on which the at least one fiber guide is arranged can cause the at least one fiber guide to move in the axial direction, so that it is no longer aligned with the compression device. However, if the at least one fiber guide has shifted in the axial direction due to the expansion, it runs onto the at least one bearing due to the traversing movement and shifts with respect to the traversing element during the further traversing movement. This shift compensates for the error if the fiber guide in this example is not aligned or not aligned with the compression device.

It is advantageous if the at least one fiber guide is arranged on the traversing element in such a way that the at least one fiber guide can transmit the traversing movement to the assigned fiber composite and can be displaced in the axial direction for alignment when it runs onto the at least one bearing. The at least one fiber guide is so firmly arranged on the traversing element that it can transmit the traversing movement oriented in the axial direction to the at least one fiber composite. The at least one fiber guide is in particular not so loosely connected to the traversing element that the at least one fiber guide is displaced with respect to the traversing element by the at least one fiber composite. On the other hand, the at least one fiber guide is not so firmly connected to the traversing element that it cannot be moved relative to the traversing element when it runs onto the bearing and as a result of the traversing movement.

It is advantageous if the compression device has a suction pipe with at least one suction slit. A vacuum is applied to the intake manifold. If the fiber composite runs through a suction slit, the fiber composite is sucked in and is thereby compacted. The suction slot is also oriented obliquely to the running direction of the fiber composite, so that the fiber composite can run over a wide area over the suction slot. As a result, the fiber composite also runs over the suction slot when the fiber composite is changed. However, it is of course the case that the fiber composite is aligned with the suction slot, since it can otherwise happen that the fiber composite is at least temporarily arranged next to the suction slot during traversing. It is therefore advantageous if the at least one fiber guide is aligned with the suction slot.

It is advantageous if the suction pipe is fixed to the bearing at least in the axial direction. As a result, the suction pipe is in fixed relation to the at least one bearing, so that when the at least one fiber guide is aligned with the bearing, it is also automatically aligned with the suction pipe and the at least one suction slot. As a result, the at least one fiber guide can be aligned with the associated suction slot.

It is also advantageous if the drafting arrangement has several, in particular eight, fiber guides, each fiber guide being assigned a fiber composite, and that the suction tube preferably has a suction slot for each fiber composite. The number of fiber guides, fiber composites and suction slots is always the same. Each fiber guide guides a fiber composite that runs through a suction slot. Instead of the suction slit, any other compression unit, for example a compression funnel, can also be used. With the help of several fiber guides, several fiber composites can be processed at the same time. The drafting system is advantageously designed to be correspondingly wide. For example, the roller pairs have a corresponding length in order to be able to stretch eight fiber composites simultaneously, as here. The suction pipe can also have a corresponding length.

If the drafting system comprises a plurality of fiber guides, these are spaced apart from one another which corresponds to the spacing of the suction slots and / or other compression units from one another.

It is advantageous if the at least one fiber guide is arranged on a guide rail which is arranged on the traversing element. The at least one fiber guide is also arranged on the guide rail. The guide rail and the at least one fiber guide or the plurality of fiber guides can be mounted as a unit on the traversing element and removed as a unit. The traversing element and the guide rail can be oriented parallel to one another.

The at least one fiber guide and / or the guide rail is advantageously arranged on the traversing element with at least one coupling element. With the aid of the coupling element, the at least one fiber guide and / or the guide rail can also be spaced from the traversing element.

It is advantageous if a strength of the fastening of the at least one fiber guide to the guide rail and / or a strength of the fastening of the guide rail to the traversing element and / or a strength of the fastening of the at least one fiber guide to the traversing element can be set by means of an adjusting device. The adjusting device can be arranged on the at least one fiber guide, on the coupling element, on the guide rail and / or on the traversing element. The adjusting device can comprise, for example, a screw in a thread. By tightening the screw, for example, the strength of the fastening between the guide rail and traversing element can be increased. As a result, the guide rail with the at least one fiber guide arranged thereon can be moved more difficultly with respect to the traversing element. The strength of the attachment between the guide rail and traversing element must not be too strong, so that the guide rail can no longer be moved from the mounting on the traversing element to align the at least one fiber guide. However, the said strength of the attachment must not be too weak, because otherwise the at least one fiber guide can no longer transmit the traversing movement to the fiber composite. During operation or during an adjustment phase of the drafting system, however, the correct strength of the attachment can easily be found with the aid of the adjustment device.

It is advantageous if the at least one fiber guide is fixedly arranged on the guide rail and the guide rail can be displaced in the axial direction with respect to the traversing element. The at least one fiber guide then has a fixed spatial relationship with the guide rail. As a result, only the guide rail on the bearing has to be displaced in order to align the at least one fiber guide. This is particularly advantageous if several fiber guides are arranged on the guide rail, so that all fiber guides are aligned at the same time.

It is advantageous if the connection between the coupling element and the traversing element and / or the guide rail and / or the at least one fiber guide is designed as a slip clutch. The slip clutch is designed such that the fiber composite does not move the at least one fiber guide with respect to the traversing element during traversing. However, the at least one fiber guide can be displaced relative to the traversing element by the bearing.

It is advantageous if the coupling element is arranged on the traversing element and / or on the guide rail by means of at least one spring element. With the aid of the at least one spring element, the coupling element can be pressed onto the traversing element and / or onto the guide rail. The spring strength is preferably chosen so that the at least one fiber guide can be aligned with the bearing, but the fiber composite does not move the fiber guide in the axial direction during traversing.

It is advantageous if the traversing element can move in the axial direction with respect to the at least one bearing. The traversing element is mounted, for example, in its radial direction in the at least one bearing. However, the traversing element can move freely in the axial direction relative to the bearing. For example, the bearing has a floating bearing for the traversing element, in which the traversing element can move in the axial direction, but is supported in the radial direction.

The drafting system advantageously has a first bearing and a second bearing spaced apart from it in the axial direction. As a result, the parts of the drafting system are supported at two points so that they cannot twist. The roller pairs, the traversing device and / or the compression device, in particular the suction pipe, are preferably mounted between the two bearings. The two bearings thus limit the drafting system on both sides in the axial direction. The drafting system with the two bearings on the two sides spaced apart in the axial direction is a so-called bearing field or punching field, the two bearings being punched.

It is advantageous if the sum of a length of the guide rail and a length of a traversing stroke of the traversing movement corresponds to a bearing distance between the two mutually facing inner sides of the two bearings. The traversing stroke corresponds to the movement between two reversal points of the traversing movement. The length of the traversing stroke is the distance between the two reversal points of the traversing movement. As a result of the traversing movement, the guide rail alternately abuts both inner sides of the two bearings when the at least one fiber guide is aligned with the compression device. If, on the other hand, the at least one fiber guide is not aligned with the compression device, the guide rail on one of the two bearings moves against the traversing element until the at least one fiber guide is aligned again.

It is advantageous if, in a central position of the fiber composite to the associated suction slot, a first distance between a first end of the guide rail and the associated first bearing corresponds to half a traverse stroke. Additionally or alternatively, it is advantageous if, in the middle position of the fiber composite to the associated suction slot, a second distance between a second end of the guide rail for the associated second bearing corresponds to half a traverse stroke. In the middle position of the fiber composite, it runs exactly over the axial slot in the middle of the suction slot.

It is advantageous if a fork element with a recess oriented in the axial direction is arranged on the at least one bearing and that a pin is arranged on the end of the guide rail facing the fork element, which protrudes into the recess and can move in the recess during a traversing movement. As a result, the at least one fiber guide can be aligned more precisely with the compression device.

It is advantageous if the recess in the axial direction has a width that corresponds to the sum of the length of the traversing stroke of the traversing movement and a pin width of the pin in the axial direction. As a result, the two reversal points of the traversing movement can be placed exactly over the two inner sides of the recess. In the reversal points, the pin alternately abuts the two inner sides.

Figur 1

eine schematische Seitenansicht eines Streckwerks einer Spinnereimaschine,

Figur 2

eine schematische Draufsicht auf einen Ausschnitt eines Streckwerks mit zwei Faserverbünden,

Figur 3

eine schematische Draufsicht auf einen Ausschnitt eines Streckwerks mit zwei Faserverbünden und zwei Lagerungen,

Figur 4

eine schematische Ansicht eines Ausschnitts des Streckwerks mit einem Gabelelement an einer Lagerung und einem Zapfen an der Führungsschiene,

Figur 5a

ein Querschnitt durch das Changierelement mit daran gekoppelter Führungsschiene und

Figur 5b

ein Querschnitt durch das Changierelement mit daran gekoppelter Führungsschiene.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

Figure 1

1 shows a schematic side view of a drafting system of a spinning machine,

Figure 2

1 shows a schematic top view of a section of a drafting system with two fiber composites,

Figure 3

1 shows a schematic plan view of a section of a drafting system with two fiber composites and two bearings,

Figure 4

2 shows a schematic view of a section of the drafting system with a fork element on a bearing and a pin on the guide rail,

Figure 5a

a cross section through the traversing element with the guide rail coupled thereto and

Figure 5b

a cross section through the traversing element with the guide rail coupled thereto.

Figure 1 shows a schematic side view of a drafting system 1 of a spinning machine. The drafting system 1 comprises pairs of rollers 2, 3, 4, between which a fiber composite 5 is passed and by means of which the fiber composite 5 can be stretched. The roller pairs 2, 3, 4 are driven so that the fiber composite 5 is drawn through the drafting device 1 in a running direction LR. As a result of a speed difference between successive pairs of rollers 2, 3, 4 in the running direction LR, the fiber composite 5 is warped, as a result of which the fiber composite 5 is homogenized.

The drafting system 1 has a traversing device 6 in order to traverse the fiber composite 5 in an axial direction X, not shown here, of the roller pairs 2, 3, 4. The roller pairs 2, 3, 4 are thereby loaded over a wide area and cutting of the fiber composite 5 into the roller pairs 2, 3, 4 is prevented.

The traversing device 6 has a traversing element 7 (not shown here) (see the following figures) and at least one fiber guide 8. The at least one fiber guide 8 introduces the fiber composite 5 into the drafting device 1, so that it runs in between the roller pairs 2, 3, 4. The fiber composite 5 is also oscillated with the aid of the at least one fiber guide 8. The at least one fiber guide 8 is designed, for example, as a funnel, so that the fiber guide 8 can guide the fiber composite 5 in any transverse direction of the fiber composite 5.

In this exemplary embodiment, a compression device 9 is arranged downstream of the roller pairs 2, 3, 4 in the running direction LR of the fiber composite 5. With the help of the compression device 9, the fiber composite 5 is compressed so that it has a higher strength.

In this exemplary embodiment, the compression device 9 also has a suction pipe 10 with at least one suction slot 11. A suction pressure can be applied to the suction pipe 10, so that the fiber composite 5 is compressed when it is pulled over the at least one suction slot 11.

In the running direction LR of the fiber composite 5 after the compression device 9, a spinning unit 12 is arranged, which spins a yarn from the fiber composite 5, which is wound onto a spool 13. The spinning unit 12 is a spinning unit in the present exemplary embodiment, but can also be any other type of spinning unit.

According to the present exemplary embodiment, the drafting system 1 has a pair of straps which comprises an upper strap 14 and a lower strap 15. The upper strap 14 is also deflected by a deflection unit 16. The lower strap 15 is deflected by a deflecting table 17 and a deflecting rod 18. According to the present embodiment, the pair of straps is between the first pair of rollers 2 and the second Roller pair 3 arranged. Alternatively or additionally, the pair of straps can also be arranged between the second pair of rollers 3 and the third pair of rollers 4. Alternatively or additionally, the pair of straps can also be arranged in the running direction LR of the fiber composite 5 after the third pair of rollers 4.

Furthermore, the roller pairs 2, 3, 4 bottom rollers 2b, 3b, 4b are generally driven, so that the fiber composite 5 is drawn through the drafting device 1. The upper rollers 2a, 3a, 4a of the roller pairs 2, 3, 4 are not driven, and rotate with them in that they rest on or are pressed onto the lower rollers 2b, 3b, 4b.

The drafting system 1 also has a clamping roller 19 which presses the fiber composite 5 onto the suction pipe 10 shown in this exemplary embodiment.

In the present exemplary embodiment, the top strap 14 is arranged around the top roller 3a and the bottom strap 15 around the bottom roller 3b of the second pair of rollers 3.

The drafting system 1 also comprises a pressure arm 20, on which the upper rollers 2a, 3a, 4a and the pinch roller 19 are arranged in the present exemplary embodiment. The pressure arm 20 can be pivoted upward away from the lower rollers 2b, 3b, 4b with the rollers mentioned, for example in order to exchange components or to be able to insert the fiber composite 5 into the drafting device 1. If the component is replaced or the fiber composite 5 is inserted, the pressure warmer 20 can be swung down again so that the upper rollers 2a, 3a, 4a settle on the lower rollers 2b, 3b, 4b.

The same reference numerals are used for features which are identical in their design and / or mode of operation and / or at least comparable to those in the previous figures. If not are explained again in detail, their design and / or mode of operation corresponds to the design and mode of operation of the features already described above.

Figure 2 shows a schematic plan view of a section of a drafting device 1, with which, as shown here, at least two fiber composites 5a, 5b can be drawn. The drafting system 1 could, however, only warp a fiber composite 5.

The drafting system 1 of the present exemplary embodiment is also open. That is, the pressure arm 20 is pivoted away from the lower rollers 2b, 3b, 4b. Figure 2 thus shows a view of the lower rollers 2b, 3b, 4b, on which the fiber composites 5a, 5b rest.

The lower rollers 2b, 3b, 4b and preferably also the upper rollers 2a, 3a, 4a and the clamping roller 19 (not shown here) can extend in the axial direction X through the entire drafting arrangement 1. The drafting system 1 thus only has a single lower roller 2b, 3b, 4b, upper roller 2a, 3a, 4a and pinch roller 19. The drafting device 1 can also stretch several fiber composites 5 at the same time. The drafting device 1 can advantageously be designed in such a way that it essentially means that it has such a length in the axial direction X that it can be used to stretch eight fiber composites 5. There are of course also eight fiber guides 8, eight lower straps 15, eight upper straps 14, eight suction slots 11 and eight spinning units 12.

In the present exemplary embodiment, the traversing device 6 has a traversing element 7, on which the fiber guides 5a, 5b are arranged. The traversing element 7 can be moved by a drive, not shown here. The traversing element 7 executes the traversing movement CB, which is advantageously oriented parallel to the axial direction X of the roller pairs 2, 3, 4. The traversing movement CB is a back and forth movement. Through the Traversing movement CB of the fiber guides 8a, 8b, the associated fiber composite 5a, 5b is also changed, so that the fiber composite 5a, 5b runs over a wide area between the roller pairs 2, 3, 4. This prevents the fiber composites 5a, 5b from being cut into the rollers 2a, 2b, 3a, 3b, 4a, 4b of the roller pairs 2, 3, 4.

The oscillating movement CB also has a first reversal point 21 and a second reversal point 22. The distance between the two reversal points 21, 22 is a traversing stroke CH or the length of the traversing stroke CH. For the sake of clarity, only the reversal points 21, 22 and the traversing stroke CH on the fiber composite 5a are shown.

The fiber composites 5a, 5b oscillate back and forth between the two reversal points 21, 22.

The suction slots 11a, 11b each have a central position M, which runs through a center in the axial direction X of the suction slots 11a, 11b. The fiber composites 5a, 5b are optimally aligned with the assigned suction slots 11a, 11b if the reversal points 21, 22 have the same distances in the axial direction X to the central position M of the suction slots 11a, 11b. The fiber composites 5a, 5b then oscillate evenly, i.e. equally far on both sides, around the middle positions M. By optimally aligning the fiber composites 5a, 5b to the associated suction slots 11a, 11b, i.e. If the fiber composites 5a, 5b oscillate around the central position M of the suction slots 11a, 11b, it is ensured that the fiber composites 5a, 5b are always arranged above the suction slots 11a, 11b during the oscillation. In particular, the fiber composites 5a, 5b do not oscillate in an area next to the suction slots 11a, 11b.

Due to thermal expansion of the traversing element 7, however, the fiber guides 8a, 8b can shift in the axial direction, so that they are no longer optimal to the compression device 9, in particular to the suction slots 11a, 11b, are aligned. The fiber composites 5a, 5b no longer oscillate evenly around the central position of the suction slots 11a, 11b. In particular, one of the two reversal points 21, 22 can then lie in the axial direction X next to the suction slot 11a, 11b, which is of course disadvantageous since the fiber composites 5a, 5b are no longer compressed there.

Another disadvantage is that the fiber guides 8a, 8b have to be arranged relatively precisely in the axial direction X and this is only possible with difficulty during assembly.

Figure 3 shows a schematic plan view of a section of the drafting device 1 with two fiber composites 5a, 5b and in this exemplary embodiment two bearings 23, 24. The drafting device 1 can also have only a single bearing 23, 24.

The same reference numerals are used for features which are identical in their design and / or mode of operation and / or at least comparable to those in the previous figures. Unless these are explained again in detail, their design and / or mode of operation corresponds to the design and mode of operation of the features already described above. In addition, for the sake of simplicity, only the features that are important for understanding are provided with a reference symbol.

The traversing device 6 is arranged for at least one bearing 23, 24 such that the at least one fiber guide 8a, 8b can be displaced in the axial direction X relative to the traversing element 7 by means of the traversing movement CB on the at least one bearing 23, 24, so that the at least one fiber guide 8a, 8b can be aligned in the axial direction X with respect to the compression device 9. According to the present exemplary embodiment, the at least one fiber guide 8a, 8b is aligned with the assigned suction slots 11a, 11b. Advantageously, the fiber composites 5a, 5b always oscillate evenly around the central position M of the suction slots 11a, 11b. If the fiber composites 5a, 5b change evenly around the central position M of the suction slot 11a, 11b, the two reversal points 21, 22 are at the same distance from the central position M.

In the two bearings 23, 24 of the present exemplary embodiment, the lower rollers 2b, 3b, 4b are rotatably mounted. Additionally or alternatively, the suction pipe 10 of the compression device 6 is arranged on the bearings 23, 24. The suction slots 11a, 11b of the suction pipe 10 thus have a fixed spatial relationship with the bearings 23, 24. The bearings 23, 24 can thus serve as a reference point for the drafting system 1.

The two bearings 23, 24 each have a floating bearing 32, 33, in which the traversing element 7 can move freely in the axial direction X. However, it is guided in the floating bearings 32, 33 in a radial direction of the traversing element 7. The two floating bearings 32, 33 can be designed, for example, as bores in the bearings 23, 24. A frictional resistance between the traversing element 7 and the two floating bearings 32, 33 should not be too great, so that the traversing element 7 can be traversed with a small force, in particular tensile force.

The two bearings 23, 24 also have mutually facing inner sides 30, 31. The two inner sides 30, 31 of the two bearings 23, 24 also have a bearing spacing A from one another. The bearing distance A is thus the clear distance between the two bearings 23, 24.

According to the present exemplary embodiment, the traversing device 6 has a guide rail 25 on which the at least one fiber guide 5a, 5b is arranged.

The guide rail 25 also has a first end 28 and a second end 29. The first end 28 faces the first bearing 23 and the second end 29 of the second bearing 24.

The guide rail 25 is arranged on the traversing element 7 by means of at least one coupling element 26, 27. In the present exemplary embodiment, the guide rail 25 is arranged on the traversing element 7 with two coupling elements 26, 27. As a result, the guide rail 25 cannot inadvertently rotate relative to the traversing element 7.

According to the present exemplary embodiment, the fiber guides 8a, 8b are aligned with the suction slots 11a, 11b. The fiber guides 8a, 8b oscillate on both sides at equal intervals around the central position M of the suction slot 11a, 11b. This means that the two reversal points 21, 22 of the traversing movement CB each have the same distances from the center position M. As a result, the distance between the reversal points 21, 22 and the central position M is half a traverse stroke CH or its length.

The guide rail 25 has a length L in the axial direction X. The bearing distance A of the bearings 23, 24, the distance of the traversing stroke CH and the length L of the guide rail 25 are advantageously related to one another. It is advantageous if the sum of the length L of the guide rail 25 and the distance of the traversing stroke CH is equal to the bearing distance A of the bearings 23, 24.

If the above-mentioned relationship applies, the first end 28 of the guide rail 25 abuts the first inner side 30 of the first bearing 23 when the traversing movement CB and thus the fiber composite 5a, 5b is at the first reversal point 21. In contrast, the second end 29 of the guide rail 25 abuts the second inner side 31 of the second bearing 24 when the traversing movement CB and thus the fiber composite 5a, 5b is in the second reversal point 22.

There is a first distance A1 between the first end 28 of the guide rail 25 and the associated first inner side 30 of the first bearing 23 when the fiber guide 8a, 8b changes exactly around the central position M. The first distance A1 is half a traverse stroke CH or half the length or distance of the traverse stroke CH.

There is a second distance A2 between the second end 29 of the guide rail 25 and the assigned second inner side 31 of the second bearing 24 when the fiber guide 8a, 8b changes exactly around the central position M. The second distance A2 is half a traverse stroke CH or half the length or distance of the traverse stroke CH.

When the fiber guides 8a, 8b are aligned with the compression device 9, in particular with the suction slots 11a, 11b, the two distances A1 and A2 between the two ends 28, 29 of the guide rail 25 to the associated inner sides 30, 31 of the two respective bearings 23 , 24 the same size.

If, for example, the traversing element 7 expands or contracts due to thermal expansion, the fiber guides 8a, 8b shift in the axial direction X relative to the compression device 9. The fiber guides 8a, 8b thereby shift either in the direction of the first bearing 23 or the second bearing 24. One reversal point 21, 22 will be further away from the center position M than the other reversal point 21, 22. In the worst case, one of the two reversal points 21, 22 lies next to the suction slot 11a, 11b.

If, for example, the first distance A1 is smaller than the second distance A2, because the guide rail 25 moves in the direction due to the thermal expansion has moved the first bearing 23, the first end 28 of the guide rail 25 will abut against the inside 30 of the first bearing 23 by the traversing movement CB, the first reversal point 21 of the traversing movement CB not having been reached yet. After bumping, the traversing movement CB is carried out in the corresponding direction. However, an idea of the invention is that in this exemplary embodiment, the guide rail 25, when it is in contact with the first inner side 30 of the first bearing 23, is displaced in the axial direction X with respect to the traversing element 7. This shift continues until the traversing movement CB has reached the first reversal point 21 and moves away from the first bearing 23 again. The traversing movement CB moves the guide rail 25 towards the second bearing 24 until the traversing movement CB has reached the second reversal point 22. The second end 29 of the guide rail 25 will abut the second inside 31 of the second bearing 24. In addition, the guide rail 25 can align itself on the second inner side 31 if, after the second end 29 has hit the second inner side 31, the second reversal point 22 of the oscillating movement CB has not yet been reached.

Figure 4 shows a schematic section of an embodiment of the drafting system 1 with a fork element 34 on a bearing 24, here the second bearing 24, and a pin 36 on the guide rail 25.

The fork element 34 is arranged here on the inside 31 of the second bearing 24 and extends from there in the axial direction X. The fork element 34 also has a recess 35 oriented in the axial direction X, which is delimited by two stops 37, 38 in the axial direction X.

The guide rail 25 also has a pin 36 which projects into the recess 35 and is arranged in particular between the two stops 37, 38. In the present exemplary embodiment, the pin 36 is arranged on the second end 29 of the guide rail 25.

A width B of the recess 35 in the axial direction X advantageously corresponds to a sum of a pin width Z of the pin 36 in the axial direction X and the length of the traversing stroke CH. As a result, the pin 36 abuts the associated stops 37, 38 in the respective reversal points 21, 22 of the traversing movement CB when the fiber guide 8 is aligned with the suction slot 11. If, however, the fiber guide 8 is not aligned with the suction slot 11, the pin 36 abuts one of the two stops 37, 38, the associated reversal point 21, 22 not having been reached yet. After bumping against one of the stops 37, 38, the guide rail 25 is displaced relative to the traversing element 7 until the fiber guide 8 is again aligned with the suction slot 11.

Figure 5a shows a cross section through the traversing element 7 with the guide rail 25 coupled thereto. The guide rail 25 is thereby by means of a coupling element 26, 27 (cf. Figure 3 , 4th ) coupled to the traversing element 7. In this exemplary embodiment, the coupling element 26, 27 comprises a holder 39 which is arranged on the traversing element 7 by means of a screw 41. The holder 39 is thus firmly connected to the traversing element 7. The coupling element 26, 27 further comprises a spring element 40 which presses the guide rail 25 against the holder 39. The guide rail 25 is displaceable in the axial direction X relative to the holder 39.

However, the spring element 40 is of such a strength that the fiber guide 8 does not move the guide rail 25 with respect to the holder 39 and thus with respect to the traversing element 7 when the fiber composite 5 is traversed. On the other hand, the strength of the spring element 40 is dimensioned such that the guide rail 25 can be displaced on the at least one bearing 23, 24 in order to align the fiber guide 8 with the compression device 9. In the present exemplary embodiment, the spring element 40 presses the guide rail 25 against the holder 39 from the inside. The spring element 40 is arranged such that it presses the guide rail 25 away from the traversing element 7.

The spring element 40 can be designed, for example, as a leaf spring or as a coil spring. The spring element 40 can also be an elastic body.

The holder 39 or at least the surfaces on which the guide rail 25 rests on the holder 39 is preferably made of a wear-resistant plastic, so that the holder 39 is not worn when the guide rail 25 is moved.

Figure 5b shows an alternative embodiment of the coupling of the guide rail 25 to the traversing element 7. In the present embodiment, the spring element 40 is designed as a leaf spring and is fixedly arranged on the traversing element 7 by means of the screw 41. The spring element 40 here presses the guide rail 25 in the direction of the traversing element 7. A spacer 42 is arranged here between the guide rail 25 and traversing element 7.

The present invention is not limited to the exemplary embodiments shown and described. Modifications within the scope of the claims are possible as well as a combination of the features, even if these are shown and described in different exemplary embodiments.

Reference list

1

Drafting system

2nd

first pair of rollers

2a

Top roller

2 B

Bottom roller

3rd

second pair of rollers

3a

Top roller

3b

Bottom roller

4th

third pair of rollers

4a

Oder roll

4b

Bottom roller

5

Fiber composite

6

Traversing device

7

Traversing element

8th

Fiber guide

9

Compression device

10th

Intake manifold

11

Suction slot

12th

Spinning unit

13

Kitchen sink

14

Top strappy

15

Lower straps

16

Deflection unit

17th

Deflecting table

18th

Deflection bar

19th

Pinch roller

20

Pressure arm

21

first turning point

22

second turning point

23

first storage

24th

second storage

25th

Guide rail

26

first coupling element

27

second coupling element

28

first end

29

second end

30th

first inside

31

second inside

32

first floating bearing

33

second floating bearing

34

Fork element

35

Recess

36

Cones

37

first stop

38

second stop

39

holder

40

Spring element

41

screw

42

Spacer

LR

Running direction

CB

Traversing movement

X

Axial direction

CH

Traverse stroke

M

Middle position

A

Storage distance

A1

first distance

A2

second distance

L

length

B

width

Z.

Pin width

Claims (15)

Drafting system (1) of a spinning machine with pairs of rollers (2, 3, 4), between which at least one fiber composite (5) can be carried out and stretched,
with a traversing device (6) comprising a traversing element (7) and at least one fiber guide (8), the at least one fiber guide (8) being able to guide a fiber composite (5) assigned to the fiber guide (8), the traversing element (7) in a traversing movement (CB) with respect to the roller pairs (2, 3, 4) in their axial direction (X), and the at least one fiber guide (8) is arranged on the traversing element (7), so that the at least one fiber composite (5 ) can be changed by means of the traversing movement (CB) of the fiber guide (8) assigned to the fiber composite (5),
with a compacting device (9), by means of which the fiber composite (5) which has already been distorted by the pairs of rolls (2, 3, 4) can be compacted,
and with at least one bearing (23, 24); in which at least the roller pairs (2, 3, 4), the traversing device (6) and / or the compacting device (9) are mounted,
characterized,
that the traversing device (6) is arranged for at least one bearing (23, 24) in such a way that the at least one fiber guide (8) by means of the traversing movement (CB) on the at least one bearing (23, 24) in the axial direction (X) with respect to the Traversing element (7) is displaceable, so that the at least one fiber guide (8) can be aligned in the axial direction (X) with respect to the compression device (9). Drafting system according to the preceding claim, characterized in that the at least one fiber guide (8) on the traversing element (7) is arranged such that the at least one fiber guide (8) can transmit the traversing movement (CB) to the associated fiber composite (5) and can be displaced in the axial direction (X) for alignment when it comes into contact with the at least one bearing (23, 24) . Drafting system according to one of the preceding claims, characterized in that the compression device (9) has a suction pipe (10) with at least one suction slot (11), a fiber composite (5) being associated with the at least one suction slot (11) and by means of which the finished warped fiber composite (5) can be compressed, and / or
the suction pipe (10) is fixed to the bearing (23, 24) at least in the axial direction (X) and the at least one fiber guide (8) can be aligned with the associated suction slot (11). Draw frame according to one of the preceding claims, characterized in that the draw frame (1) has a plurality, in particular eight, fiber guides (8), a fiber composite (5) being associated with each fiber guide (8), and preferably with the suction pipe (10) each fiber composite (5) has a suction slot (11). Drawing system according to one of the preceding claims, characterized in that the at least one fiber guide (8) is arranged on a guide rail (25) which is arranged on the traversing element (7), and in that the traversing element (7) and the guide rail (25) are preferably oriented parallel to one another. Drawing system according to one of the preceding claims, characterized in that the at least one fiber guide (8) and / or the guide rail (25) is arranged on the traversing element (7) with at least one coupling element (26, 27) and in that the connection between the coupling element (26, 27) and the traversing element (7) and / or the guide rail (25) and / or the at least one fiber guide (8) is preferably designed as a slip clutch. Drafting system according to one of the preceding claims, characterized in that by means of an adjusting device a strength of the fastening of the at least one fiber guide (8) on the guide rail (25) and / or a strength of the fastening of the guide rail (25) on the traversing element (7) and / or a strength of the attachment of the at least one fiber guide (8) to the traversing element (7) can be set. Drafting system according to one of the preceding claims, characterized in that the at least one fiber guide (8) is fixedly arranged on the guide rail (25) and the guide rail (25) is displaceable in the axial direction (X) relative to the traversing element (7). Drafting system according to one of the preceding claims, characterized in that the coupling element (26, 27) is arranged on the traversing element (7) and / or on the guide rail (25) by means of at least one spring element (40). Drafting system according to one of the preceding claims, characterized in that the traversing element (7) can move in the axial direction (X) relative to the at least one bearing (23, 24). Drafting system according to one of the preceding claims, characterized in that the drafting system (1) has a first bearing (23) and a second bearing (24) spaced apart from it in the axial direction (X) and
that preferably between the two bearings (23, 24) the roller pairs (2, 3, 4), the traversing device (6) and / or the compacting device (9), in particular the suction pipe (10), are mounted. Drafting system according to one of the preceding claims, characterized in that the sum of a length (L) of the guide rail (25) and a length of a traversing stroke (CH) of the traversing movement (CB) a bearing distance (A) between mutually facing inner sides (30, 31 ) of the two bearings (23, 24) corresponds. Drafting system according to one of the preceding claims, characterized in that, in a central position (M) of the fiber composite (5) to the associated suction slot (11), a first distance (A1) between a first end (28) of the guide rail (25) and the associated first bearing (23) corresponds to half a traversing stroke (CH) and / or a second distance (A2) between a second end (29) of the guide rail (25) to the associated second bearing (24) corresponds to half a traversing stroke (CH). Drafting system according to one of the preceding claims, characterized in that a fork element (34) with a recess (35) oriented in the axial direction (X) is arranged on the at least one bearing (23, 24) and
that a pin (36) is arranged on the end (28, 29) of the guide rail (25) facing the fork element (34), which protrudes into the recess (35) and moves in the recess (35) during a traversing movement (CB) can. Drafting system according to one of the preceding claims, characterized in that the recess (35) in the axial direction (X) has a width (B) which is the sum of the length of the traversing stroke (CH) Traversing movement (CB) and a pin width (Z) of the pin (36) in the axial direction (X) corresponds.

Images