CN111979618B

CN111979618B - Compressor unit for a drafting device of a textile machine

Info

Publication number: CN111979618B
Application number: CN202010430845.XA
Authority: CN
Inventors: K·胡贝尔
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2019-05-22
Filing date: 2020-05-20
Publication date: 2023-04-11
Anticipated expiration: 2040-05-20
Also published as: CN111979618A; DE102019113676A1; EP3741888A1; EP3741888B1

Abstract

The invention relates to a compressor unit for a drafting device of a textile machine for compressing a fibre aggregate (6) which has been drawn, wherein the compressor unit (1) has at least one fibre aggregate guide (3, 4) and the fibre aggregate guide (3, 4) has a guide surface (11 a, 113a, 13 b) for the fibre aggregate (6), the fibre aggregate (6) being extendable in the longitudinal direction of the guide surface and bearing surfaces (15, 16) arranged on the guide surfaces (11 a, 113a, 13 b) being suitable for supporting the compressor unit (1) on a drafting device roller (2), wherein the bearing surfaces (15, 16) of the fibre aggregate guide (3, 4) are made of plastic, characterized in that the fibre aggregate guide (3, 4) has a wear edge (21) on its bearing surface (15, 16) along the guide surface (11 a, 13a, 13b.

Description

Compressor unit for a drafting device of a textile machine

Technical Field

The invention relates to a compressor unit for a drafting device of a textile machine for compressing a fibre aggregate that has been drawn, wherein the compressor unit has at least one fibre aggregate guide and the fibre aggregate guide has a guide surface for the fibre aggregate, the fibre aggregate being extendable in the longitudinal direction of the guide surface and, in the longitudinal direction of the guide surface, a bearing surface being provided for supporting the compressor unit on a drafting device roller, the bearing surface of the fibre aggregate guide being made of plastic.

Background

EP2314743A1 discloses a pressure roller group for a drafting device of a textile machine. The press roll set has a base body and two non-contact double press rolls accommodated in the base body. This set of rollers also has a compressor unit fixed to the support. This compressor unit is arranged on the base body in a freely movable manner. Two wear-resistant parts are fastened to the compressor unit, which on the one hand serve to support the compressor unit appropriately on the drafting device rollers and on the other hand serve to compress the fiber aggregate supplied by the drafting device arranged in front of it.

In the case of this mechanical compression, the compressor is located on the delivery cylinder of the drawing device. During the compacting, the fibers are guided in a compression channel. However, these fibers move in the channel only when the edge of the channel abuts the delivery cylinder without play or at least only a short distance from the surface of the delivery cylinder. In this case, a distance of, for example, about half the diameter of the fibers to be compacted is still acceptable. If the distance is increased, there is no guarantee that the fibres remain in the channels. This is a prerequisite for ensuring a safe compaction process. The diameter of the fibres is in the range of 0.05 to 0.03mm and therefore the compressor needs to be manufactured very accurately.

EP3073000A1 discloses a compressor unit in which the first wear part is not mounted directly on the drafting device rollers. Therefore, it is not necessary to directly match the wear-resistant member with the draft device roller, and the entire compressor unit can be manufactured at a lower cost. The support surface of the drafting device roller in the region of the first fibre assembly guide is made of a material with low abrasion resistance. In this case, the less wear-resistant material, which may be plastic, for example, can be adapted to the drafting device rollers made of metal by selective wear. This results in a very tight bearing surface against the drafting device rollers after a certain operating time. However, the second wear part is made of steel or ceramic, and therefore must be produced very precisely in order to be able to be adapted precisely to the drafting device rollers. The accuracy requirements are particularly difficult to follow due to the length of the compressor unit extending in the region of the two spinning positions or drawing frames arranged next to one another.

DE102012025176A1 discloses a compressor for arrangement between an output pressure roller and a supply pressure roller of a drafting device of a ring spinning machine, having at least one magnet for positioning the compressor on a supply cylinder of the drafting device, wherein the compressor is made of wear-resistant and sprayable plastic. In this embodiment, only a single fiber aggregate guide is provided per spinning position.

A disadvantage of the known compressor unit is that the wear-resistant part is mounted on the drafting device roller by means of its wear-resistant surface. These wear parts must therefore be produced very precisely in order to ensure that the bearing surfaces, which are usually curved in accordance with the periphery of the drawing frame rollers, are flush with the drawing frame rollers. This bearing surface must be adapted and adjusted as required in order to ensure that there is no excessively large gap between the wear part and the drafting device rollers, into which gap the fibers of the fiber aggregate may penetrate. This is very costly. If this support is made of a wear-resistant material, there is a risk that these components cannot be optimally matched to the drafting device rollers when the compressor unit is initially used. Only by using the compressor for a long time, the compressor wears out and thus assumes the contour of the drafting device rollers. Previously, only significantly poorer spinning results could be obtained, since the fibers were only very insufficiently compacted. Thus spinning poor yarns. The less wear resistant compressor will match the diameter of the delivery cylinder relatively quickly, but will also wear out after a short time. This is contrary to the requirement of extending the useful life of the compressor.

Disclosure of Invention

The object of the invention is therefore to provide a compressor unit which can be produced at low cost, has a long service life and is also capable of compressing a fibre aggregate which is located on the drafting device rollers and is guided and compressed by this compressor unit as quickly and as error-free as possible.

The solution of the invention to achieve the above object is a compressor unit having the features of independent claim 1.

The compressor unit of the invention is suitable for use in drafting devices of textile machines. The compressor unit is used for compressing the fiber assembly which is stretched. Wherein the compressor unit comprises at least one fiber aggregate guide. The fiber assembly guide has a compression channel in which the fiber assembly is compressed. The compression device can furthermore be arranged in the longitudinal direction of the fibre assembly and usually at a distance from one another, and in addition to the compression channel it can also have a further fibre assembly guide in which the fibre assembly is deflected and/or centred relative to the compression channel. Furthermore, one or more further fiber assembly guides, which can correspond to adjacent drafting devices, can be arranged parallel to this first and/or second fiber assembly guide.

The fiber aggregate guide has a guide surface for the fiber aggregate and a support surface arranged on the guide surface for supporting the compressor unit on the drafting device roller. The fiber assembly may extend in a longitudinal direction of the guide surface. The support surface of the fiber aggregate guide is made of plastic. This plastic can have wear-resistant properties in order to use the compressor unit on the drawing frame for a long time without impairing the guiding properties of the fibers or the sealing against the drawing frame rollers.

In order to avoid, on the one hand, having to produce the fibre aggregate guide very precisely in order to seal it against the drafting device rollers and, on the other hand, to avoid the need for too long a time until the fibre aggregate guide has worn into place to such an extent that the fibre aggregate guide matches the drafting device rollers and the fibres are no longer clamped between the fibre aggregate guide and the drafting device rollers or leave this guide, according to the invention this fibre aggregate guide has a frayed edge on its bearing surface along the guide surface. This wear edge ensures that it is only necessary to adapt this wear edge to the drafting device rollers in order to bring the compressor unit into close contact with the drafting device rollers. The fraying edge of the fiber aggregate guide wears substantially faster than if the entire subsequent bearing surface had to be matched. As soon as the worn edge matches the drafting device roller, a good seal is achieved, so that the fibers cannot be clamped between the drafting device roller and the fiber aggregate guide or leave this guide again.

After the wear edge has been sealed, the bearing surface of the compressor unit on the drafting device roller is increased, so that the wear life is extended. In this way a longer service life of the compressor unit is achieved, since the wear is significantly reduced compared to the initial phase. Thus, the break-in period, during which the yarn may not be of the desired quality, is shortened by means of this wear edge. The service life of the compressor unit will be very long, however, because after the break-in period the wear of the compressor unit is substantially slower than during the break-in period.

If in an advantageous embodiment of the invention the height of the worn edge is less than/equal to 0.2mm, the worn edge will after a short time match the shape of the drafting device rollers and thus seal the compressor unit against the drafting device rollers. Manufacturing tolerances may vary within this range but still match the actual shape very quickly.

The wear edge advantageously has an initial width of less than/equal to 2mm. This width causes the wear edge to wear away rapidly during operation in the spinning position, and on the other hand, if the wear edge is matched to the drafting device rollers, a sufficient seal is achieved.

In a particularly advantageous embodiment of the invention, the wear edge is preferably inclined gradually from the guide surface of the fiber aggregate guide towards the bearing surface. This means that the wear edge on the fiber aggregate guide, in particular on the compression channel, is higher than the wear edge in the region of the subsequent bearing surface of the compressor unit. The wear edge may thus be angular or, for example, in the form of a slope or bevel, for example constructed in a straight or curved manner. The angle of this ramp or bevel may be, for example, 1 ° to 20 °. This slope or bevel may taper towards the fiber aggregate guide or terminate in a platform with a width of, for example, no more than 2mm. Alternatively, the wear edge can also be designed in the form of an arc, the radius of which is preferably between 250mm and 2500 mm. The gradual inclination of the wear edge towards the bearing surface results in an increase in the width of the bearing surface as the wear of the wear edge increases, so that a gradually improved sealing of the compressor unit against the drawing-off roller is achieved. In addition, this can lead to rapid wear at the start, which in turn leads to a faster initial seal. As the operating time increases, the sealing surfaces become larger and the wear of the compressor unit becomes smaller until a complete bearing surface of the compressor unit on the drafting device rollers is achieved.

The bearing surface of the fibre assembly guide is preferably made of plastic with sliding bearing properties. In this way, the wear of the compressor unit as a whole is very small. Therefore, this compressor unit can be used for a long period of time. By means of this wear edge, a faster initial wear is still achieved on the basis of the initially smaller bearing surface when the compressor unit is initially used, so that the compressor unit can be adapted to the drawing frame and a seal is achieved. As soon as this initial wear is overcome, the service life of the compressor unit is very long, and the wear is correspondingly reduced, on the basis of the plastic used, which has the characteristics of a sliding bearing.

The compressor unit preferably comprises a support on which the fiber aggregate guide for one and/or two drawing frames is arranged. The compressor unit with the inventive wear edge can be constructed in such a way that it has only the compression channel of a drafting device for one spinning position or only this compression channel and a further fiber aggregate guide for this drafting device or this spinning position. However, the compressor unit can also be designed in such a way that it comprises two compression channels for two drafting devices or spinning positions arranged in parallel or two compression channels and two further fiber aggregate guides for two drafting devices or spinning positions arranged in parallel.

In an advantageous embodiment of the invention, the fibre assembly guides are arranged on the carrier in such a way that they are at a distance from each other in the longitudinal direction and/or the transverse direction of the fibre assembly guides. The take-off roller of the drafting device is usually arranged between two fiber aggregate guides in the longitudinal direction, i.e. in the direction of travel of the fiber aggregate. These fiber aggregate guides guide two fiber aggregates extending in parallel in the transverse direction, i.e. transversely to the direction of travel of the fiber aggregate, in two drafting devices or two spinning positions.

Advantageously, the first fiber aggregate guide arranged first in the direction of travel of the fiber aggregate has at least one guide surface for a guide channel of the fiber aggregate, and the second fiber aggregate guide arranged after this first fiber aggregate guide in the direction of travel of the fiber aggregate has at least one guide surface for a compression channel of the fiber aggregate. In this case, the guide surface of the first fiber aggregate guide can also be suitable for the purpose of positioning the compressor unit on the draft device rollers in a satisfactory manner. This guide surface acts on the fiber aggregate only in the case of a large deviation of the fiber aggregate to be guided in its position. In addition, the first fiber aggregate guide can also have a wear-resistant guide element which is not in contact with the drafting device rollers but only with the fiber aggregate for guiding the fiber aggregate.

In a particularly advantageous embodiment of the invention, the bearing surface for bearing on the drafting device roller has a curvature whose radius corresponds substantially to the radius of the drafting device roller against which the bearing surface is intended to bear. The same applies to the wear edge. In this case, it is advantageous that the worn edge does not have to be produced as precisely as the bearing surface, since the shape of the drafting device roller is already accepted after a short time due to the selective expected wear, in particular of the worn edge.

In particular at least in the case of the first fiber aggregate guide, it is advantageous if it has a wear-resistant part made of steel or ceramic, in particular in the form of a pin, for guiding the fiber aggregate. The wear-resistant guide element is preferably not in contact with the drafting device rollers, so that the guide element is not worn by friction with the drafting device rollers (optionally with the fibres of the fibre aggregate).

In order to be able to stably mount the compressor unit on the drafting device roller, a support projection is preferably arranged on the mounting surface at a distance from the wear edge. The support projection is also subject to wear, so that it runs in when the compressor unit is used. Thus, both the wear edge and the support projection can stably support the compressor unit on the draft device roller already at the beginning of the use of the compressor unit during the spinning operation. During use of the compressor unit, this bearing becomes increasingly stable and tight due to increased wear, without the compressor unit taking up an impermissible position.

In a preferred embodiment, the support protrusions have an initial support area of 0.05 to 1mm ² In the meantime. In this way, this support projection is quickly subject to wear and quickly matches the requirements for a compliant position of the compressor unit.

Like the wear edge, it is particularly advantageous if this support projection is preferably inclined gradually towards the bearing surface. In this case, the support projection can also be embodied in a ramp-like manner with a pointed end or with a rounded or angular platform. Alternatively, the support projection can also be embodied in the form of a truncated sphere. Therefore, the support area of the support projection increases as the wear increases, so that the wear also becomes gradually slow.

The compressor unit preferably comprises at least one receptacle for a load element for generating a bearing force on a bearing surface of the compressor unit. This produces a defined bearing force, so that the compressor unit is pressed tightly against the drafting device rollers.

In a preferred embodiment of the invention, the compressor unit has a wear indicator for the bearing surface of the fiber aggregate guide. In this way, the user of the spinning machine can simply determine whether the total wear of the compressor unit exceeds the permissible level, so that the compressor unit can be replaced in time without affecting the quality of the spinning result.

Drawings

Other advantages of the invention are seen in the examples below. Wherein:

figure 1 is a side view of a compressor unit located on the drafting device rollers,

figure 2 is a bottom view of a compressor unit for two fibre aggregates,

figure 3a is a cross-sectional view of a fiber aggregate guide,

figure 3b is a cross-sectional view of an alternative fiber assembly guide,

FIG. 4 is a side view of an alternative fiber assembly guide, an

Fig. 5 is a front view of a compressor unit for two fiber aggregates.

Detailed Description

In the following description of the illustrated alternative embodiments, the same reference numerals are used for features that are the same and/or at least similar in their technical solution and/or manner of action as compared to other embodiments of the present application. Unless specified again, the technical solutions and/or modes of action of the described embodiments are equivalent to the technical solutions and modes of action of the features described above.

Fig. 1 shows a side view of a compressor unit 1 arranged above a drafting device roller 2. The compressor unit 1 has a first fiber aggregate guide 3 and a second fiber aggregate guide 4. Between the first fiber aggregate guide 3 and the second fiber aggregate guide 4 and behind the second fiber aggregate guide 4, press rollers 5 are arranged, which press rollers 5 press the fiber aggregate 6 onto the lower drafting device roller 2. The pressure roller 5 forming the delivery roller of the drafting device is fixed on the pressure arm 7, and the pressure arm 7 presses the pressure roller 5 and the compressor unit 1 onto the drafting device roller 2.

The first fiber aggregate guide 3 and the second fiber aggregate guide 4 are connected to each other via a holder 8. The two fiber aggregate guides 3 and 4 are arranged on a support 8. The two fiber assembly guides can be moved relative to the holder 8 or fixed to the holder 8. On the support 8, a receptacle 9 is arranged, which receptacle 9 cooperates with a load element 10, which load element 10 supports the compressor unit 1 in a movable manner relative to the pressure arm 7 and thus presses the compressor unit 1 precisely and firmly onto the drafting device roller 2.

In the first fiber aggregate guide 3, a guide channel 11 with

guide surfaces

11a and 11b (see fig. 2) is arranged, which guide channel 11 simply brings together the fiber aggregate 6 and presses it onto the drafting device rollers 2. The second fiber aggregate guide 4 serves to compress the fiber aggregate 6 and thus has a compression channel 13 including guide surfaces 13a and 13b (see fig. 2). In addition to the compression channel 13, the second fiber assembly guide 4 has a bearing surface 15, which bearing surface 15 is designed essentially in a manner corresponding to the curvature of the draft device rollers 2 and is intended to rest on the draft device rollers 2 without play. The first fiber aggregate guide 3 further has a support surface 16 for supporting on the draft device roller 2. Both bearing

surfaces

15 and 16 have a curvature with a radius r, so that they can be adapted to the respective radius of the drafting device roller 2.

The two fibre assembly guides 3 and 4 can be made of plastic together with the holder 8 and preferably also the receptacle 9. The two fiber aggregate guides can be formed integrally with the carrier 8 or can be connected to the carrier 8, for example by means of an adhesive connection. The two fiber aggregate guides can also be movably connected to the support, so that the two fiber aggregate guides can be adapted to the drafting device rollers. The receptacle 9 serves to fix the carrier 8 to the load element 10.

The plastic can be embodied with particularly good sliding properties. In particular the bearing surfaces 15 and 16 of the fibre assembly guides 3, 4 are preferably made of plastic with sliding bearing properties. These plastics, which are usually used for plain bearings, have particularly good wear resistance and low sliding friction resistance together with the steel from which the drafting device rollers 2 are made. If this plastic contains a solid lubricant, a longer service life can be achieved. This plastic can also be used in extreme conditions if it is durable with respect to operating temperatures of more than 200 c, in particular at least 230 c.

The side view shows the rounded conical shape of the fibre aggregate guides 3 and 4 in order to be able to rest against the press roll 5. In the contact with the pressure roller 5, it is also advantageous if the fibre aggregate guides 3 and 4 are made of plastic, since this reduces wear and friction losses. The bearing

surface

15 or 16 is integrated into the compressor unit 1 and is curved in order to be able to rest against the drafting device roller 2.

Fig. 2 shows a bottom view of the compressor unit 1 for two fiber aggregates 6. The compressor unit 1 shown in fig. 2 is designed as a double-sided component in order to compress two fiber aggregates 6 spun at adjacent spinning positions by means of a carrier 8, on which two compressor units 1 are arranged. In the first fiber aggregate guide 3 having the guide passage 11 and the guide surfaces 11a and 11b, the fiber aggregate 6 is slightly compressed for the first time in conjunction with the draft device roller 2, and after the fiber aggregate 6 is compressed for the first time, the fiber aggregate 6 enters the compression passage 13 of the second fiber aggregate guide 4. In this compression channel, the pre-compressed fiber aggregate 6 is pressed against at least one of the guide surfaces 13a and 13b of the compression channel 13, which are arranged obliquely to the direction of travel of the fiber aggregate 6, and the fiber aggregate 6 is further compacted. This results in a particularly advantageous, dense fiber aggregate 6, which can then be spun.

The compressor unit 1 has wear indicators 20 for the bearing surfaces 15 and 16 of the fibre aggregate guides 3 and 4. The wear indicator 20 is embodied as a surface between the two fiber aggregate guides 3 and 4 in the region of the holder 8. When the bearing surfaces 15 and 16 wear out after a long period of use, which bear against the rotating drafting device rollers 2 during use, the compressor unit 1 is shortened in the radial direction of the drafting device rollers 2. This shortens or even completely consumes the radial distance between the bearing surfaces 15 and 16 and the wear indicator 20. In extreme cases, material may even be removed from the wear indicator 20. This is a sign for the user that the compressor unit 1 must be replaced, since the guiding of the fiber aggregate 6 is no longer sufficiently ensured.

On the bearing surfaces 15 and 16, a wear edge 21 is arranged along the guide channel 11 and the guide surfaces 11a and 11b and the compression channel 13 with the guide surfaces 13a and 13b. As shown in the figures, the wear edge 21 protrudes from the bearing surfaces 15 and 16. When the compressor unit 1 is in the new state, the worn edge 21 comes into contact with the draft device roller 2. After the wear edge 21 protrudes beyond the bearing surfaces 15 and 16, the wear edge 21 is first removed by friction with the drawing frame roller 2. This very quickly achieves a continuous contact surface with the drawing frame rollers 2, so that the fibers of the fiber aggregate 6 can no longer be clamped between the compressor unit 1 and the drawing frame rollers 2 or can escape through the gap from the guide channel 11 or the compression channel 13.

Furthermore, it can be seen in fig. 2 that a support projection 22 is arranged on the carrier 8. The support projections 22 form the possibility that the compressor unit 1 can be stably placed against the middle draft device roller 2. The support protrusions 22 are also adapted to wear. The support projection 22 therefore has only a small seat. The conical solution by means of, for example, the supporting projection 22 will first of all cause greater wear than during further use of the compressor unit 1. It may also be sufficient to arrange only a single support projection 22 on the holder 8. As an alternative, the supporting projections 22 can also be arranged on the bearing surfaces 15 and/or 16.

Fig. 3a shows a cross section of the first fiber aggregate guide 3. A pin 12 is disposed in the fiber aggregate guide 3. The pin 12 is inserted in a receptacle formed as a recess. The pin 12 forms the upper side of the guide 11 opening towards the support surface 16. The lateral guide surfaces 11a and 11b of the guide channel 11 are formed from the plastic material of the carrier 8. The fiber aggregate 6 is guided in the rectangular region of the guide channel 11. After a greater friction force can be expected on the upper side of the guide 11 due to the fiber aggregate 6, the pin element 12 is advantageously made of steel or ceramic in order to permanently and constantly guide the fiber aggregate 6. The pin element 12 can be advantageous in particular when spinning especially corrosive materials is to be carried out.

On the edges of the guide surfaces 11a and 11b, projections are provided opposite the support surface 16. This protrusion represents the wear edge 21. The wear edge 21 has a height H, which is preferably at most 0.2mm. The width B is preferably at most 2mm. The height H decreases in the direction of the bearing surface 16. The angle α of the inclined surface, here shown as a ramp, of the bearing surface 16 may be, for example, in the range from 1 ° to 15 °. As the wear of the wear edge 21 increases, the bearing surface on the wear edge 21 becomes larger and larger, so that the wear rate also decreases. In this way, the wear on the worn edge 21 is relatively rapid and severe for the new compressor unit 1, so that the compressor unit 1 is quickly adapted and sealed to the drafting device roller 2.

Fig. 3b shows a cross section of an alternative first fibre aggregate guide 3. The fiber aggregate guide 3 is of a construction similar to the embodiment shown in fig. 3a, but without the steel or ceramic pin 12. This embodiment is sufficient for normal use of less corrosive fibre materials, in particular when using plastics which are also used for sliding bearings. In this embodiment, each wear edge 21 is of spherical design. In this case, it is advantageous if the radius R is in the range between 250mm and 2500 mm. In this embodiment, wear also occurs at the beginning of use of the compressor unit 1 and this wear is gradually reduced. This very quickly brings about an exact adaptation of the compressor unit 1 to the drawing frame rollers 2 without causing the compressor unit 1 to wear out continuously and severely.

Similarly, the design shown in fig. 3a and 3b can be chosen for the second fiber aggregate guide 4.

Fig. 4 shows an alternative embodiment of the compressor unit 1. In this embodiment, the compressor unit 1 comprises only the second fiber aggregate guide 4 with the compression channel 13. In some compression spinning methods, such compression of the fiber assembly 6 is sufficient. As in the other embodiments, the fibre assembly guide 4 has a projection in the form of a wear edge 21 against the bearing surface 15. Here, also when the fibre assembly guide 4 is used for the first time, the worn edge 21 will be removed first. This achieves a quick sealing of the fibre assembly guide 4 against the drafting device rollers 2.

Fig. 5 shows a front view of the compressor unit 1 for two fiber aggregates 6. The second fiber aggregate guides 4 of the two parallel drafting devices can be seen. The compression channel 13 opens toward the draft device roller 2. The compressor unit 1 rests on the drafting device roller 2 by means of the wear edge 21 and the support projection 22. Between the fiber aggregate guides 4, receiving parts 9 are arranged, by means of which receiving parts 9 the holder 8 can be fixed to the load element 10. The support 8 can also rest against the drafting device roller 2. However, if only the wear edge 21 and the support projection 22 or (after running-in) the bearing surfaces 15 and 16 rest against the draft device roller 2, the compressor unit 1 can be better supported against the draft device roller 2. As a result of the increased wear of the wear edge 21 and the support projection 22, the surface of the compressor unit 1 which is intended to bear against the drafting device roller 2 becomes larger until the bearing surfaces 15 and 16 come into contact with the drafting device roller 2 as completely as possible. In this case, further wear is reduced, since the largest possible contact surface with the drafting device roller 2 is present. The rapid wear of the wear edge 21 causes a very rapid sealing of the compression channel 13 against the drawing frame rollers 2. If the bearing surfaces 15 and 16 are also worn, the compressor unit 1 must be replaced, as can be seen from the reduced depth of the wear indicator 20.

The invention is not limited to the embodiments shown and described. Modifications may be made slightly within the scope of the claims. Thus, for example, both the guide channel 11 and the compression channel 13 can be formed with only one

guide surface

11a or 11b or 13a or 13b. It is explicitly pointed out that combinations of the features shown and described in the different embodiments are also included in the scope of the present claims. The device is constructed in accordance with the foregoing description, wherein the features mentioned can be used individually or in any combination.

List of reference numerals

1 compressor unit

2 drafting device roller

3 first fiber aggregate guide

4 second fiber aggregate guide

5 compression roller

6 fiber aggregate

7 pressure arm

8 support

9 locus of containment

10 load element

11 guide channel

11a, 11b guide surface

12-pin piece

13 compression channel

13a, 13b guide surface

15 bearing surface

16 bearing surface

20 wear indicator

21 wear edge

22 support projection

Radius R

radius of curvature r

Width B

Height H

Angle of alpha bevel

Claims

1. A compressor unit for a drawing device of a textile machine for compressing a drawn fiber aggregate (6),

wherein the compressor unit (1) has at least one fiber aggregate guide (3, 4),

and the fibre aggregate guide (3, 4) has a guide surface (11 a, 113a, 13 b) for the fibre aggregate (6), which guide surface can be extended in the longitudinal direction of the fibre aggregate (6),

and bearing surfaces (15, 16) arranged on the guide surfaces (11 a, 11b, 13a, 13 b) are adapted to support the compressor unit (1) on drafting device rollers (2),

wherein the bearing surfaces (15, 16) of the fiber aggregate guide (3, 4) are made of plastic, and

the fiber aggregate guide (3, 4) has a wear edge (21) on its bearing surface (15, 16) along the guide surface (11 a, 113a, 13 b),

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

the bearing surfaces (15, 16) of the fibre aggregate guide (3, 4) are made of plastic with sliding bearing properties, and the wear edge (21) is gradually inclined from the guide surface (11 a, 113a, 13 b) towards the bearing surfaces (15, 16).

2. Compressor unit according to the preceding claim, in which the height (H) of the wear edge (21) is ≦ 0.2mm.

3. Compressor unit according to claim 1 or 2, in which the initial width (B) of the wear edge (21) is ≦ 2mm.

4. Compressor unit according to claim 1, characterized in that the compressor unit (1) has a holder (8) on which a fiber aggregate guide (3, 4) for one and/or two drafting devices is arranged.

5. Compressor unit according to claim 4, in which the fibre aggregate guides (3, 4) are arranged on the bracket (8) in such a way that they are at a distance from each other in the longitudinal direction and/or transverse direction of the fibre aggregate guides (3, 4).

6. Compressor unit according to claim 4, in which the first fibre aggregate guide (3) has at least one guide surface (11 a, 11 b) of the guide channel (11) and the second fibre aggregate guide (4) has at least one guide surface (13 a, 13 b) of the compression channel (13).

7. Compressor unit according to claim 1, characterised in that the bearing surfaces (15, 16) for bearing on the drafting device rollers (2) have a curvature whose radius (r) corresponds substantially to the radius of the drafting device rollers (2) against which they are to bear.

8. Compressor unit according to claim 4, in which at least one of the fibre aggregate guides (3, 4) has a wear-resistant part of steel or ceramic for guiding the fibre aggregate (6).

9. Compressor unit according to claim 8, in which the wear-resistant part is a pin (12).

10. Compressor unit according to claim 1, in which on the bearing surface (15, 16) a support projection (22) is arranged at a distance from the wear edge (21).

11. Compressor unit according to claim 10, in which the initial area of the support projection (22) is between 0.05 and 1mm ² In the meantime.

12. Compressor unit according to claim 10, in which the support projections (22) are inclined progressively towards the bearing surfaces (15, 16).

13. Compressor unit according to claim 1, in which the compressor unit (1) has at least one receptacle (9) for a load element for generating a bearing force on the bearing surface (15, 16).

14. Compressor unit according to claim 1, characterized in that the compressor unit (1) has a wear indicator (20) for the bearing surfaces (15, 16) of the fibre aggregate guide (3, 4).