EP3741888A1 - Condensing unit for a drafting device of a textile machine - Google Patents

Abstract

The invention relates to a compression unit for a drafting system of a textile machine, for compressing a fully drawn fiber structure (6), the compression unit (1) having at least one fiber structure guide (3, 4) and the fiber structure guide (3, 4) a guide surface (11a, 11b; 13a, 13b) for the fiber structure (6), in the longitudinal direction of which the fiber structure (6) can run, and a supporting surface (15, 16) arranged on the guide surface (11a, 11b; 13a, 13b) for supporting the Compaction unit (1) is provided on a drafting roller (2), the support surface (15, 16) of the fiber structure guide (3, 4) being made of a plastic, characterized in that the fiber structure guide (3, 4) on its support surface (15 , 16) has a wear edge (21) along the guide surface (11a, 11b; 13a, 13b).

Description

The present invention relates to a compression unit for a drafting system of a textile machine, for compression of a ready-drawn fiber structure, the compression unit having at least one fiber structure guide and the fiber structure guide having a guide surface for the fiber structure, in the longitudinal direction of which the fiber structure can run, and a support surface arranged on the guide surface is provided for the support of the compressor unit on a drafting roller, the support surface of the fiber structure guide is made of a plastic.

From the EP 2 314 743 A1 a pressure roller unit for a drafting system of a textile machine is known. The pressure roller unit has a base body and two non-touching pressure roller twins which are received in the base body. The printing roller unit also has a compression unit which is fastened to a holder. The compressor unit is arranged to be freely movable on the base body. Two wear-resistant components are attached to the compressor unit, which on the one hand serve for a suitable support of the compressor unit on a drafting device roller and on the other hand are intended for compressing a fiber strand supplied from a drafting device arranged in front of it.

With this mechanical compression, the compression is located on the output cylinder of the drafting system. During compaction, the fibers are guided in the compression channel. However, the fibers all move within the channel only when its edges lie snugly on the output cylinder or are at least only a small distance from the surface of the output cylinder. A distance such as half the diameter of the fibers to be compacted is still acceptable. If the distance increases, there is no guarantee that the fibers will still be within the Canal stay. However, this is the prerequisite for ensuring a safe compacting process. Since the diameter of a fiber is in the range from 0.05 to 0.03 mm, very precise manufacture of the compressor is required.

The EP 3 073 000 A1 discloses a compactor unit in which the first wear-resistant component does not sit directly on the drafting roller. As a result, it is not immediately necessary to adapt the wear-resistant component to the drafting device roller, which means that the entire compressor unit can be manufactured more cost-effectively. The contact surface for the drafting roller in the area of the first fiber structure guide is made of a less wear-resistant material. This less wear-resistant material, which can be plastic, for example, is able to adapt to the metal drafting roller through targeted wear. In this way, after a certain operating time, a very dense contact surface with respect to the drafting device roller is achieved. The second wear-resistant component, however, is made of steel or ceramic and must therefore be manufactured very precisely in order to enable an exact adaptation to the drafting roller. Due to the length of the compressor unit, which extends over two spinning stations or drafting units arranged next to one another, the accuracy requirement is particularly difficult to meet.

From the DE 10 2012 025 176 A1 a compressor for arrangement between the output pressure roller and delivery pressure roller of a drafting system for ring spinning machines, with at least one magnet for positioning the compressor on the delivery cylinder of the drafting system is known, the compressor being made of low-wear, injectable plastic. In this embodiment, only a single fiber structure guide is provided per spinning station.

The disadvantage of the known compressor units is that the wear-resistant components sit with their wear-resistant surfaces on the drafting roller. It is therefore required that a very precise manufacturing process the wear-resistant components must be made in order to ensure that the contact surface, which is usually curved according to the circumference of the drafting device roller, is flush with the drafting device roller. The contact surface may have to be adapted and adjusted to ensure that there is no inadmissibly large gap between the wear-resistant component and the drafting roller, into which fibers of the fiber structure could penetrate. This is very costly. If the support is made of a material that is subject to wear, there is a risk that the adaptation of the component to the drafting system roller is not yet optimal at the beginning of the use of the compression unit. Only after prolonged use of the compressor does it wear out to such an extent that it takes on the contour of the drafting device roller. Until then, only a significantly poorer spinning result is achieved, since the fibers are only very inadequately compacted. A bad yarn is spun accordingly. A compressor with a low wear resistance would adapt relatively quickly to the diameter of the output cylinder, but would also wear out after a short time. This would run counter to the requirement for a long life of a compressor.

The object of the present invention is thus to create a compactor unit which is inexpensive to manufacture, has a long service life and is also able to effect the compaction of a fiber structure located on a drafting roller and guided and compressed by the compactor unit as quickly as possible without errors .

The object is achieved by a compressor unit with the features of independent patent claim 1.

A compressor unit according to the invention is provided for a drafting system of a textile machine. It serves to compress a fully drawn fiber structure. The compressor unit comprises at least one fiber structure guide. The fiber structure guide has a compression channel in which the fiber structure is compressed. The compression device can also be arranged in the longitudinal direction of the fiber assembly and usually at a distance from one another, in addition to the compression channel, have a further fiber assembly guide in which the fiber assembly is deflected and / or centered in relation to the compression channel. It is also possible that one or more further fiber structure guides are provided parallel to this first and / or second fiber structure guide, which can be assigned to an adjacent drafting system.

The fiber structure guide has a guide surface for the fiber structure and a support surface, which is arranged on the guide surface, for the support of the compressor unit on a drafting system roller. The fiber structure can run in the longitudinal direction of the guide surface. The support surface of the fiber structure guide is made of a plastic. The plastic can have wear-resistant properties, as a result of which the compressor unit can be used on the drafting system for a long time without the guiding properties for the fibers or the seal with respect to the drafting system roller being impaired.

On the one hand to avoid that the production of the fiber structure guide has to be carried out very precisely in order to achieve a seal between the fiber structure guide and the drafting roller and, on the other hand, to avoid that it takes too long for the fiber structure guide to run in so far that it fits has adapted to the drafting roller and thus no more fibers are jammed between the fiber structure guide and the drafting roller or leave the guide, is according to the invention provided that the fiber structure guide has a wear edge on its support surface along the guide surface. The wear edge ensures that only the wear edge has to be adapted to the drafting device roller in order to achieve a tight fit of the compressor unit on the drafting device roller. The wear of this edge of the fiber structure guide provided for wear takes place much faster than if the entire subsequent support surface would have to be adapted. As soon as the wear edge has been adapted to the drafting system roller, a good seal is achieved so that no more fibers are trapped between the drafting system roller and the fiber structure guide or can leave the guide.

After the wear edge creates a seal, the contact surface of the compactor unit on the drafting roller is enlarged, which increases the wear life. This results in a long service life of the compressor unit, since the wear is significantly reduced compared to the initial phase. With the wear edge, the running-in time, in which the yarn may not have the desired quality, is reduced. The service life of the compressor unit will nevertheless be very long, since after the running-in period the wear and tear of the compressor unit progresses much more slowly than during the running-in period.

If, in an advantageous embodiment of the invention, the wear edge has a height of less than / equal to 0.2 mm, the wear edge will be adapted to the shape of the drafting unit roller after a short time and will seal the compressor unit against the drafting unit roller. The manufacturing inaccuracies can move in this area and there is nevertheless a very rapid adaptation to the actual shape.

The wear edge advantageously has an initial width of less than / equal to 2 mm. This width causes rapid wear of the wear edge during operation of the spinning station, and on the other hand is a Sufficient sealing is achieved if the wear edge is adapted to the drafting roller.

In a particularly advantageous embodiment of the invention, the wear edge drops, preferably gradually, from the guide surface of the fiber structure guide to the support surface. This means that the wear edge on the fiber structure guide, in particular on the compression channel, is formed higher than in the area of the subsequent support surface of the compression unit. The wear edge can accordingly be angular or, for example, in the form of a ramp or embankment, for example straight or curved. The angle of the ramp or embankment can be, for example, 1 ° to 20 °. The ramp or embankment can taper towards the fiber structure guide or end in a plateau with a width of, for example, up to 2 mm. Alternatively, it is also possible for the wear edge to be arcuate with a radius of preferably between 250 mm and 2500 mm. This gradual decrease of the wear edge towards the support surface has the effect that with increasing wear of the wear edge the width of the support surface increases and thus an increasingly improved sealing of the compressor unit against the drafting roller is achieved. This also has the effect that the wear takes place quickly at the beginning and thus a faster initial seal is effected. As the running time increases, the sealing surface becomes larger and the wear and tear of the compression unit is reduced, until the complete contact surface of the compression unit on the drafting roller is reached.

The support surface of the fiber structure guide is preferably made of a plastic that has sliding bearing properties. This has the effect that the overall wear on the compressor unit is very low. The compressor unit can thus be used for a long time. Due to the wear edge, however, at the beginning of use of the compressor unit, due to the initially small contact surface, a faster one Achieved initial wear, whereby the compression unit can adapt to the drafting system and achieve a seal. As soon as this initial wear and tear has been overcome, the service life of the compressor unit is very long due to the plastic used with sliding bearing properties and the wear is correspondingly low.

The compression unit preferably comprises a holder on which fiber structure guides for one and / or two drafting devices are arranged. The compression unit with the wear rim according to the invention can be designed in such a way that it has only the compression channel for a drafting device of a spinning station or the compression channel and a further fiber structure guide for this one drafting device or this one spinning station. The compression unit can also be designed so that it comprises two compression channels, which are provided for two parallel-arranged drafting units or spinning units, or for the two parallel-arranged drafting units or spinning units, it includes two compression channels and two further fiber structure guides.

In an advantageous embodiment of the invention, the fiber structure guides are arranged on the holder such that they are spaced apart from one another in the longitudinal direction and / or transverse direction of the fiber structure guides. In the longitudinal direction, i.e. H. in the running direction of the fiber structure, an output roller of the drafting system is often arranged between the two fiber structure guides. In the transverse direction, i.e. H. across the running direction of the fiber structure, the fiber structure guides cause two parallel fiber structures to be guided in two drafting units or two spinning stations.

The first fiber structure guide arranged first in the running direction of the fiber structure advantageously has at least one guide surface of a guide channel for the fiber structure and the second fiber structure guide arranged thereafter in the running direction of the fiber structure has at least one Guide surface of the compression channel for the fiber structure. The guide surface of the first fiber structure guide can also be provided so that it is used for the correct positioning of the compressor unit on the drafting system roller. Only in the event that the fiber structure to be guided has major deviations in its position, this guide surface would then come into effect in relation to the fiber structure. The first fiber structure guide can also have a wear-resistant guide element, which has no contact with the drafting device roller, but only has contact with the fiber structure for guiding the fiber structure.

In a particularly advantageous embodiment of the invention, the support surface for the support on the drafting device roller has a curvature, the radius of which essentially corresponds to the radius of the drafting device roller on which it is to rest. This also applies to the wear edge. The advantage here is that the wear edge, like the support surface, does not have to be manufactured exactly, since the shape of the drafting roller is adopted after a short time due to the targeted and intended wear, in particular of the wear edge.

In particular, it is advantageous at least with regard to the first fiber structure guide if it has a wear-resistant component made of steel or ceramic, in particular in the form of a pin, for guiding the fiber structure. This wear-resistant guide element preferably has no contact with the drafting device roller, as a result of which there is no wear of the guide element due to friction with the drafting device roller, possibly due to friction with the fibers of the fiber structure.

In order to enable a stabilized support of the compressor unit on the drafting device roller, it is preferably provided that a support elevation is arranged on the support surface and at a distance from the wear edge.

The raised support is also subject to wear and tear and therefore runs in at the beginning of the use of the compressor unit. Both the wear edge and the support elevation thus enable the compressor unit to be supported on the drafting roller in a stable manner at the beginning of the use of the compressor unit in spinning operation. In the course of using the compressor unit, the pad becomes more and more stable and dense due to increasing wear, without the compressor unit assuming an impermissible position.

In a preferred embodiment, the support elevation has an initial support area between 0.05 and 1 mm ² . As a result, the support increase is subject to rapid wear and tear and quickly adapts to the requirements for a correct position of the compressor unit.

Comparable to the wear edge, it is particularly advantageous if the support elevation slopes down towards the support surface, preferably gradually. The support elevation can also be designed in the form of a ramp with a point or a round or angular plateau. Alternatively, it is also possible, among other things, for it to be designed in the form of a spherical segment. The support surface of the support elevation thus increases with increasing wear, so that wear also takes place gradually more slowly.

The compressor unit preferably comprises at least one receptacle for a loading element for generating a bearing force on the bearing surfaces of the compressor unit. As a result, a defined contact force and thus the compacting unit resting tightly on the drafting roller can be generated.

In a preferred embodiment of the invention, the compressor unit has a wear indicator for the support surface of the fiber structure guide. This makes it easy for the operator of the spinning machine to determine whether the overall wear of the compressor unit exceeds a permissible level and can therefore replace the compressor unit in good time without the quality of the spinning result suffering.

Figur 1

eine Seitenansicht auf eine Verdichtereinheit an einer Streckwerkswalze,

Figur 2

eine Ansicht von unten auf eine Verdichtereinheit für zwei Faserverbände,

Figur 3a

einen Schnitt durch eine Faserverbandführung,

Figur 3b

einen Schnitt durch eine alternative Faserverbandführung,

Figur 4

eine Seitenansicht auf eine alternative Faserverbandführung und

Figur 5

eine Ansicht von vorne auf eine Verdichtereinheit für zwei Faserverbände.

Further advantages of the invention are described in the following exemplary embodiments. It shows:

Figure 1

a side view of a compactor unit on a drafting roller,

Figure 2

a view from below of a compression unit for two fiber structures,

Figure 3a

a section through a fiber structure guide,

Figure 3b

a section through an alternative fiber structure guide,

Figure 4

a side view of an alternative fiber structure guide and

Figure 5

a view from the front of a compression unit for two fiber structures.

In the following description of the alternative exemplary embodiments shown, the same reference numerals are used for features that are identical and / or at least comparable in their design and / or mode of operation in comparison to other exemplary embodiments of this application. If these are not explained again in detail, their design and / or mode of action corresponds to the design and mode of action of the features already described above.

Figure 1 shows a side view of a compression unit 1, which is arranged above a drafting device roller 2. The compressor unit 1 has a first Fiber structure guide 3 and a second fiber structure guide 4. Between the first fiber structure guide 3 and the second fiber structure guide 4 and after the second fiber structure guide 4 there is a pressure roller 5 which presses a fiber structure 6 onto the lower drafting device roller 2. The pressure rollers 5, which form the output rollers of the drafting system, are attached to a pressure arm 7 which presses both the pressure rollers 5 and the compression unit 1 onto the drafting system roller 2.

The first fiber structure guide 3 and the second fiber structure guide 4 are connected to one another by means of a holder 8. The two fiber structure guides 3 and 4 are arranged on the holder 8. You can move relative to the holder 8 or be fixed to this. A receptacle 9 is arranged on the holder 8, which cooperates with a loading element 10, which supports the compression unit 1 so as to be movable relative to the pressure arm 7 and thus causes the compression unit 1 to be pressed precisely and firmly onto the drafting roller 2.

In the first fiber structure guide 3 is a guide channel 11 with guide surfaces 11a and 11b (see Figure 2 ) arranged, which summarizes the fiber structure 6 slightly and presses it against the drafting roller 2. The second fiber structure guide 4 serves to compress the fiber structure 6 and accordingly has a compression channel 13 with guide surfaces 13a and 13b (see FIG Figure 2 ) on. In addition to the compression channel 13, the second fiber structure guide 4 has a support surface 15 which is designed essentially in accordance with the rounding of the drafting device roller 2 and should therefore lie snugly on the drafting device roller 2. The first fiber structure guide 3 also has a support surface 16 for resting on the drafting device roller 2. Both bearing surfaces 15 and 16 have a curvature with a radius r so that they can adapt to the corresponding radius of the drafting device roller 2.

The two fiber structure guides 3 and 4 can be made of plastic together with the holder 8 and preferably also the receptacle 9. They can be made in one piece with the holder 8 or be connected to it, for example, by means of an adhesive connection. It is also possible that they are movably connected to the holder so that they can adapt to the drafting device roller. The receptacle 9 is used to fasten the holder 8 to the loading element 10.

The plastic can be designed to slide particularly well. In particular, the bearing surfaces 15 and 16 of the fiber structure guide 3, 4 are preferably made of a plastic that has sliding bearing properties. These plastics, which are usually used for plain bearings, have particularly good wear resistance and a low sliding friction resistance in connection with steel from which the drafting device roller 2 is made. If the plastic contains a solid lubricant, a long service life is possible. If the plastic is resistant to an operating temperature of over 200 ° C., in particular at least 230 ° C., it can also be used under extreme conditions.

The side view shows the rounded conical shape of the fiber structure guide 3 and 4 in order to be able to cling to the pressure rollers 5. Even in the case of contact with the pressure rollers 5, it is advantageous if the fiber structure guides 3 and 4 are made of plastic material, because it reduces wear and friction losses. The support surface 15 or 16 is integrated in the compression unit 1 and is arched so that it can nestle against the drafting device roller 2.

In Figure 2 a view from below of a compression unit 1 for two fiber structures 6 is shown. The compressor unit 1 of the Figure 2 is designed as a double-sided component so that two fiber structures 6, which are spun at adjacent spinning stations, can be compressed by means of a holder 8 on which two compression units 1 are arranged. In the first fiber structure 3 with the guide channel 11 and the guide surface 11a and 11b in connection with the drafting roller 2, a first, slight compression of the fiber structure 6. After this first compression of the fiber structure 6, it enters the compression channel 13 of the second fiber structure guide 4 the already pre-compressed fiber structure 6 is pressed against at least one of the guide surfaces 13a and 13b of the compression channel 13 arranged at an angle to the running direction of the fiber structure 6 and is further compacted. This creates a particularly advantageous, dense fiber structure 6 which can then be spun.

The compressor unit 1 has a wear indicator 20 for the bearing surfaces 15 and 16 of the fiber structure guides 3 and 4. The wear indicator 20 is designed as a surface between the two fiber structure guides 3 and 4 in the area of the holder 8. If the bearing surfaces 15 and 16 are worn out after a long period of use in which they rest on the rotating drafting device roller 2, the compacting unit 1 is shortened in the radial direction of the drafting device roller 2. As a result, the radial distance between the bearing surfaces 15 and 16 and the wear indicator 20 is shortened or even used up entirely. In the extreme case, material is even removed from the wear indicator 20. This is the sign for an operator that the compressor unit 1 must be replaced, since the guidance of the fiber structure 6 can no longer be adequately guaranteed.

On the bearing surfaces 15 and 16, along the guide channels 11 and the guide surfaces 11a and 11b and the compression channels 13 with the guide surfaces 13a and 13b, wear edges 21 are arranged. The wear edges 21 protrude beyond the bearing surfaces 15 and 16, as can be seen from the following figures. When the compressor unit 1 is new, the wear edges 21 contact the drafting device roller 2. After they protrude over the bearing surfaces 15 and 16, they are first removed by the friction with the drafting device roller 2. This very quickly becomes a Continuous contact surface with the drafting system roller 2 is created so that fibers of the fiber structure 6 can no longer be pinched between the compression unit 1 and the drafting system roller 2 or can exit from the guide channel 11 or the compression channel 13 through a gap.

Furthermore, the representation of the Figure 2 it can be seen that 8 support elevations 22 are arranged on the holder. The support elevations 22 form a possibility that the compressor unit 1 can rest stably on the drafting device roller 2. The support elevations 22 are also intended to wear out. Accordingly, they only have a small deposit. For example, a conical design of the support elevations 22 will initially result in greater wear than in the further course of use of the compressor unit 1. It may also be sufficient that only a single support elevation 22 is arranged on the holder 8. Alternatively, the support elevation 22 can also be arranged on the support surface 15 and / or 16.

In Figure 3a a section through a first fiber structure guide 3 is shown. A pin 12 is arranged in this fiber structure guide 3. The pin 12 is inserted in a receptacle which is designed as a recess. It forms the upper side of the guide 11, which is open towards the support surface 16. The lateral guide surfaces 11a and 11b of the guide channel 11 are formed by the plastic material of the holder 8. The fiber structure 6 is guided in this region of the guide channel 11, shown here as a rectangle. Since higher frictional forces are to be expected on the upper side of the guide 11 due to the fiber structure 6, it is advantageous if the pin 12 is made of steel or ceramic in order to bring about a permanent, constant guidance of the fiber structure 6. This pin 12 can be particularly advantageous when particularly aggressive materials are to be spun.

At the edges of the guide surfaces 11a and 11b, there is an increase in relation to the support surface 16. This increase represents the wear edge 21. The wear edge 21 has a height H, which is preferably a maximum of 0.2 mm. A width B is preferably a maximum of 2 mm. In the direction of the support surface 16, the height H gradually decreases. The angle α of the bevel of the support surface 16, shown here as a ramp, can for example be in a range from 1 ° to 15 °. With increasing wear of the wear edge 21, the bearing surface on the wear edge 21 becomes larger and larger, as a result of which the speed of wear also decreases. This has the effect that, in the case of a new compressor unit 1, the wear on the wear edges 21 will be rapid and severe, as a result of which the compressor unit 1 will be quickly adapted and thus sealed to the drafting device roller 2.

Figure 3b shows a section through an alternative first fiber structure guide 3. This fiber structure guide 3 is constructed similarly to the embodiment according to FIG Figure 3a , but has no steel or ceramic pin 12. For normal applications with a less aggressive fiber material, this design is sufficient, especially when a plastic is used that is also used for slide bearings. The respective wear edge 21 is convex in this embodiment. A radius R in a range between 250 mm and 2500 mm is advantageous here. In this embodiment, too, the wear occurs at the beginning of the use of the compressor unit 1 and gradually decreases. The exact adaptation of the compression unit 1 to the drafting device roller 2 thus takes place very quickly, without causing permanent heavy wear on the compression unit 1.

The design of the Figures 3a and 3b can also be selected for the second fiber structure guide 4.

In Figure 4 an alternative embodiment of the compressor unit 1 is shown. In this embodiment, the compression unit 1 only comprises the second fiber structure guide 4 with a compression channel 13. In some compression spinning processes, such compression of the fiber structure 6 is sufficient. As in the other exemplary embodiments, the fiber structure guide 4 has an elevation in the form of a wear edge 21 opposite the support surface 15. Here, too, the wear edge 21 is first removed when the fiber structure guide 4 is used for the first time. A quick sealing of the fiber structure guide 4 with respect to the drafting roller 2 is achieved.

In Figure 5 a front view of a compression unit 1 for two fiber structures 6 is shown. The respective second fiber structure guide 4 of the two parallel drafting units can be seen. The compression channels 13 are open to the drafting roller 2. The compression unit 1 rests with the wear edges 21 and the support elevations 22 on the drafting system roller 2. The receptacle 9, with which the holder 8 can be fastened to the loading element 10, is arranged between the fiber structure guides 4. The holder 8 can also rest on the drafting device roller 2. A better support of the compressor unit 1 on the drafting device roller 2 is obtained if only the wear edges 21 and the support elevations 22 or, after running in, the bearing surfaces 15 and 16 rest on the drafting device roller 2. Due to increasing wear of the wear edges 21 and the support elevations 22, the surface with which the compressor unit 1 rests on the drafting device roller 2 becomes larger until the bearing surfaces 15 or 16 are largely in full contact with the drafting device roller 2. Further wear is then minimized since the largest possible contact surface with the drafting device roller 2 is present. The rapid wear of the wear edges 21 results in a very rapid sealing of the compression channel 13 with respect to the drafting device roller 2. If the contact surfaces 15 or 16 wear out, can be recognized from the reduced depth of the wear indicator 20 that the compressor unit 1 must be replaced.

The present invention is not restricted to the illustrated and described exemplary embodiments. Modifications within the scope of the claims are possible. For example, both guide channel 11 and compression channel 13 can be designed with only one guide surface 11a or 11b or 13a or 13b. It is expressly pointed out that a combination of the features, even if these are shown and described in different exemplary embodiments, are included within the scope of the applicable patent claims. The device is designed according to the preceding description, it being possible for the features mentioned to be present individually or in any combination.

List of reference symbols

1

Compressor unit

2

Drafting roller

3

first fiber structure guide

4th

second fiber structure guide

5

Pressure roller

6

Fiber bandage

7th

Low pressure

8th

holder

9

admission

10

Loading element

11

Guide channel

11a, 11b

Guide surface

12

pen

13

Compression channel

13a, 13b

Guide surface

15th

Support surface

16

Support surface

20th

Wear indicator

21st

Wear edge

22nd

Support increase

R.

radius

r

Radius of curvature

B.

width

H

height

α

Ramp angle

Claims (15)

Compaction unit for a drafting system of a textile machine, for compressing a ready-drawn fiber structure (6),
wherein the compression unit (1) has at least one fiber structure guide (3, 4),
and the fiber structure guide (3, 4) has a guide surface (11a, 11b; 13a, 13b) for the fiber structure (6), in the longitudinal direction of which the fiber structure (6) can run,
and a support surface (15, 16) arranged on the guide surface (11a, 11b; 13a, 13b) is provided for the support of the compactor unit (1) on a drafting system roller (2),
wherein the support surface (15, 16) of the fiber structure guide (3, 4) is made of a plastic,
characterized in that
the fiber structure guide (3, 4) has a wear edge (21) on its support surface (15, 16) along the guide surface (11a, 11b; 13a, 13b). Compressor unit according to the preceding claim, characterized in that the wear edge (21) has a height (H) <= 0.2 mm. Compressor unit according to one or more of the preceding claims, characterized in that the wear edge (21) has an initial width (B) <= 2 mm. Compressor unit according to one or more of the preceding claims, characterized in that the wear edge (21) of the Guide surface (11a, 11b; 13a, 13b) slopes down towards the support surface (15, 16), preferably gradually. Compressor unit according to one or more of the preceding claims, characterized in that the bearing surface (15, 16) of the fiber structure guide (3, 4) is made of a plastic which has sliding bearing properties. Compression unit according to one or more of the preceding claims, characterized in that the compression unit (1) has a holder (8) on which fiber structure guides (3, 4) for one and / or two drafting units are arranged. Compressor unit according to one or more of the preceding claims, characterized in that the fiber structure guides (3, 4) are arranged on the holder (8) in such a way that they are spaced from one another in the longitudinal direction and / or transverse direction of the fiber structure guides (3, 4). Compressor unit according to one or more of the preceding claims, characterized in that the first fiber structure guide (3) has at least one guide surface (11a, 11b) of a guide channel (11) and the second fiber structure guide (4) has at least one guide surface (13a, 13b) of a compression channel ( 13). Compressor unit according to one or more of the preceding claims, characterized in that the support surface (15, 16) for the support on the drafting device roller (2) has a curvature, the radius (r) of which essentially corresponds to the radius of the drafting device roller (2) who should rest it. Compressor unit according to one or more of the preceding claims, characterized in that at least one of the fiber structure guides (3, 4) has a wear-resistant component made of steel or ceramic, in particular a pin (12), for guiding the fiber structure (6). Compressor unit according to one or more of the preceding claims, characterized in that a support elevation (22) is arranged on the support surface (15, 16) and at a distance from the wear edge (21). Compressor unit according to one or more of the preceding claims, characterized in that the support elevation (22) has an initial area between 0.05 and 1 mm ² . Compressor unit according to one or more of the preceding claims, characterized in that the support elevation (22) slopes down towards the bearing surface (15, 16), preferably gradually. Compressor unit according to one or more of the preceding claims, characterized in that the compressor unit (1) has at least one receptacle (9) for a loading element for generating a bearing force on the bearing surfaces (15, 16). Compressor unit according to one or more of the preceding claims, characterized in that the compressor unit (1) has a wear indicator (20) for the support surface (15, 16) of the fiber structure guide (3, 4).

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