EP3666942A1 - Condensing unit, pressure roller unit and drawing unit - Google Patents

Abstract

The invention relates to a compressor unit for two drafting systems (1) of a textile machine arranged next to one another, with a holder (24) on which a first and a second contact surface (12, 13) are arranged, which are operated on one during operation of the drafting system (1) Draft roller (5) can rest. A compression area (22) is arranged on each of the contact surfaces (12, 13) in order to be able to compact a fiber structure (17) which is guided longitudinally through the compression area (22), the first and second contact surfaces (12, 13) being transverse to the Compression areas (22) spaced apart and connected to a coupling element for a traversing device for traversing the compressor unit (11) transversely to the two compression areas (22). According to the invention, the compressor unit (11) has a third contact surface (14) for supporting the compressor unit (11) during operation of the drafting device (1) on the drafting device roller (5), the third contact surface (14) between the first and the second contact surface (12,13) and along the compression areas (22) is arranged offset. The invention further relates to a pressure roller unit (8) and a drafting system (1) for two drafting systems (1) of a textile machine arranged next to one another, the compressor unit (11) being designed as described above.

Description

The present invention relates to a compressor unit for two drafting systems of a textile machine arranged side by side with a holder, wherein a first and a second contact surface are arranged on the holder, which can rest on a drafting roller during operation of the drafting system, a compression area being arranged on each of the contact surfaces in order to be able to compress a fiber structure that is guided lengthwise through the compression region, the first and second contact surfaces being spaced apart from one another transversely to the compression regions and with a coupling element for a traversing device for traversing the compressor unit transversely to the two compression regions, and a pressure roller unit with a such a compressor unit and a drafting system with such a pressure roller unit.

From the EP 1 953 275 B1 a drafting system in a ring spinning machine for drawing a fiber structure is known. The drafting system comprises mechanical means for compressing the fiber structure warped in the drafting system, which have at least one guide surface, which is in each case arranged obliquely to a transport direction of the fiber structure. In addition, the drafting system has a traversing device which is coupled to compressor components which have the guide surfaces. The lifespan of the drafting rollers can be extended by means of the traversing device, since the fiber structure is displaced by the traversing device over the lateral surface of the drafting device rollers or the drafting device rollers. This prevents the fiber structure from being cut at one point on the drafting roller. However, it is disadvantageous if the traversing device is displaced relative to the compressor components during the open drafting system. In order to be able to reconnect the compressor components to the traversing device, play is provided at the connection point between the traversing device and the compressor components. The positioning and oscillation of the compressor components can only be done inaccurately.

From the EP 3 124 660 A1 a changeable compressor unit for a drafting system of a textile machine, in particular a ring spinning machine, is known. The compressor unit has at least one guide with a contact surface which bears against a drafting roller during operation of the drafting system. A fiber structure can be guided with the guide. The contact surface is advantageously curved and in particular concave, the contact surface being adapted to a lateral surface of the drafting roller. The guide has a compression area so that the fiber structure is compressed by the compression area. It can be moved in the axial direction of the drafting roller. The compressor unit is positioned on the drafting roller by means of two contact surfaces which are arranged one behind the other in the running direction of the fiber structure. The positioning of the compressor unit with respect to the drafting device is restricted by the two contact surfaces, in particular by the contact surface arranged in front of the first top roller. The first top roller must be arranged relatively far from the drafting system and the wrap of the second top roller through the thread is quite large.

The object of the present invention is therefore to provide a compressor unit, a pressure roller unit and a drafting system, in particular for a ring spinning machine, which enables the compressor unit to be positioned in a stable manner and a uniform and stable thread to be spun.

The object is achieved by a compressor unit, a pressure roller unit and a drafting system with the features of the independent claims.

The compressor unit according to the invention for two drafting systems of a textile machine, in particular a ring spinning machine, arranged side by side, has a holder on which a first and a second contact surface is arranged, which can rest on a drafting roller during operation of the drafting system. A compression area is arranged on each of the contact surfaces in order to be able to compact a fiber structure that is guided longitudinally through the compression area. The first and the second contact surface are spaced apart from one another transversely to the compression regions. A coupling element is arranged on the compressor unit for a traversing device for traversing the compressor unit transversely to the two compression regions.

According to the invention, the compressor unit has a third contact surface for supporting the compressor unit during operation of the drafting system on the drafting system roller. The third contact surface is arranged between the first and the second contact surface and offset longitudinally to the compression areas. This third contact surface allows the compressor unit to be supported very stably on the drafting roller without the support impeding a close positioning of the compressor unit and the pressure roller assembly on the other rollers of the drafting system. This close positioning of the compressor unit and the pressure roller unit on the rollers of the drafting system also means that the draw-off roller of the pressure roller unit can be positioned on the drafting roller with which it interacts so that there is only a slight wrap of the thread produced with the withdrawal roller gives. This low looping enables a very stable spinning, which on the one hand produces a uniform thread and on the other hand, above all, little thread breaks.

It is particularly advantageous if the third contact surface or the element which has the contact surface forms the coupling element for the traversing device. The contact surface thus guarantees on the one hand an exact positioning of the first and second contact surface in relation to the drafting roller and also has the effect that this exact positioning of the two contact surfaces is retained even when the compressor unit shifts. Tilting of the compressor unit in relation to the drafting machine roller is thus avoided and the guidance of the fiber structure in the compression area is thus also guaranteed during traversing without fibers being able to leave the compression area laterally.

If the third contact surface has flanks for making contact with the traversing device, then an exact displacement transverse to the running direction of the fiber structure or to the compression area is made possible. The traversing device thus has a defined engagement surface in order to be able to apply a lateral force to the third contact surface.

If the flanks of the third contact surface are chamfered, it is very easy to thread the contact surface into the traversing device. The contact surface is lifted together with the pressure roller unit to open the drafting system from the drafting system roller, while the traversing device remains in its original position. If the drafting system is closed, the pressure roller unit, together with the compressor unit, comes back onto the drafting roller. To enable the compressor unit to oscillate, the third contact surface is coupled to the oscillation device. This coupling is easier because of possible different positions of the traversing device and the compressor unit if the flanks of the third contact surface are beveled.

It when the third contact surface is arranged on the holder is particularly advantageous. This enables a stable design of the three contact surfaces. It has proven to be particularly advantageous if the holder with the three contact surfaces was injection molded from plastic or, in the case of a particularly durable design, the contact surfaces themselves were added to the holder from a wear-resistant material.

If, in an advantageous embodiment of the invention, a receiving element for receiving the compressor unit in a pressure roller assembly of the drafting systems is arranged on the holder, it can be ensured when the drafting system is opened that the compressor unit together with the pressure roller assembly is lifted off the drafting roller. The receiving element can also be used to provide, for example, a loading spring which presses the compressor unit firmly onto the drafting roller in order to allow the fiber assembly to be guided safely without individual fibers being able to slide out of the compression area laterally.

The first and the second contact surface preferably each have a curvature which essentially corresponds to a corrugated cylinder section of the drafting roller intended for them, and the third contact surface has a length which projects into this cylinder section in order to be supported on an unerrated cylinder section of the drafting roller To be able to, an exact contact of the first and second contact surface on the drafting roller is guaranteed without there being inadmissible gaps.

A pressure roller unit according to the invention for two drafting systems of a textile machine arranged side by side has a compressor unit, a base body and two roller twins, which consist of two pressure rollers and two take-off rollers and which are accommodated in the base body. The roller twins can be placed on a common drafting roller. The pressure roller unit has at least one means for fastening the compressor unit to the base body of the pressure roller unit. The compressor unit comprises a first and a second contact surface, which can rest on the drafting roller during operation of the drafting system. A compression area is arranged on each of the contact surfaces in order to be able to compact a fiber structure that is guided longitudinally through the compression area. The first and the second contact surface are transverse to the Compaction areas spaced apart and each arranged between the pressure roller and the take-off roller of the two twin rolls. The compressor unit is arranged movably on the base body of the pressure roller unit transversely to the two compression areas.

According to the invention, the compressor unit is designed as described above. For this purpose, the compressor unit has a third contact surface for supporting the compressor unit during operation of the drafting system on the drafting system roller. For this purpose, the third contact surface is arranged offset between the first and the second contact surface and along the compression regions. This arrangement of the third contact surface creates space to arrange the compressor unit rotated around the drafting roller in various positions, which can be very close to the other drafting rollers. Especially if the position is very close to the other drafting rollers, the fixed arrangement of the further thread course in the ring spinning machine means that there is only a small thread wrap of the output roller. This enables a more stable spinning with only a few thread breaks.

A drafting system according to the invention is equipped with a drafting roller at the outlet of the drafting system and with a pressure roller unit for two drafting systems of a textile machine, in particular a ring spinning machine, arranged next to one another. The pressure roller assembly comprises a base body and two roller twins, which consist of two pressure rollers and two take-off rollers and which are accommodated in the base body. The roller twins can be placed on the drafting roller. A compressor unit has a first and a second contact surface, which bear against the drafting roller during operation of the drafting system. A compression area is arranged on each of the contact surfaces in order to be able to compact a fiber structure that is guided longitudinally through the compression area. The first and the second contact surface are transverse to the compression areas spaced from each other and are each arranged between the pressure roller and the take-off roller. The drafting system has a traversing device. The compressor unit comprises a coupling element for connecting the compressor unit to the traversing device and for traversing the compressor unit transversely to the two compression regions.

According to the invention, the compressor unit is designed as described above. It has a third contact surface for supporting the compressor unit during operation of the drafting system on the drafting system roller. The third contact surface is arranged between the first and the second contact surface and offset longitudinally to the compression areas. This enables the compressor unit to be optimally positioned in the drafting system, and yet the compressor unit can be stored very stably on the drafting system roller, even if it is oscillated.

If, in an advantageous embodiment of the invention, the third contact surface forms the coupling element for the traversing device, stable, tilt-free traversing of the compressor unit on the drafting roller is possible. In addition, opening and closing the drafting system can be carried out quickly and easily.

If the third contact surface advantageously has flanks for contacting the traversing device, this also helps for a precise traversing of the compressor unit, since the flanks allow a very good introduction of force into the compressor unit.

It is particularly advantageous if the traversing device has a traversing tongue which surrounds the third contact surface as a fork or eyelet. The coupling between the compressor unit and the traversing tongue of the traversing device is in particular when the drafting system is opened and closed possible particularly quickly and reliably. By designing the traversing tongue as a fork or eyelet, a reliable coupling of the compressor unit to the traversing device is guaranteed at the same time.

In a particularly advantageous embodiment, the fork or eyelet has cheeks which interact with the flanks of the third contact surface. A flat contact can thus be established between the traversing tongue and the compressor unit, which ensures reliable traversing.

If, in a preferred embodiment of the invention, the flanks and / or the cheeks are bevelled, it is particularly easy to thread the third contact surface into the traversing device when the pressure roller unit is placed on the drafting roller. In particular, if the traversing device or the traversing tongue is changed in position during the open drafting system, the slanted flanks or cheeks can nevertheless be used for safe threading.

If the traversing tongue preferably has a contact surface for resting on the drafting roller, the position of the traversing tongue in the horizontal direction is determined by the drafting roller. When the traversing tongue is moved in the axial direction of the drafting roller, the traversing tongue is thus guided through the drafting roller. When the compressor unit is coupled to the traversing tongue, the third contact surface or the element of the compressor unit, which comprises the third contact surface, can hereby be inserted into the corresponding opening of the traversing tongue without the traversing tongue being able to deflect in the vertical direction.

It is particularly advantageous if the pressure roller forms a negative curtain for the drafting roller. This means that in a side view of the drafting system, the angle between a drafting system line and a line which runs through the center points of the drafting system roller and the pressure roller, is less than 90 °. Particularly good guidance of the fiber structure is thus achieved when entering a nip between the pressure roller and the drafting roller.

It is very particularly advantageous if the take-off roller is wrapped at an angle of less than 90 °, preferably less than 30 °, by a thread emerging from the drafting device. This significantly increases the spinning stability, since fewer thread breaks are to be expected.

Figur 1

einen Längsschnitt durch ein erfindungsgemäßes, geschlossenes Streckwerk,

Figur 2

einen Längsschnitt durch das Streckwerk aus Figur 1 in geöffneter Stellung,

Figur 3

eine Ansicht von unten auf eine erfindungsgemäße Verdichtereinheit,

Figur 4

eine Draufsicht auf Unterwalzen des erfindungsgemäßen Streckwerks und

Figur 5

eine geschnittene Vorderansicht auf das erfindungsgemäße Streckwerk.

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

Figure 1

2 shows a longitudinal section through a closed drafting system according to the invention,

Figure 2

a longitudinal section through the drafting system Figure 1 in the open position,

Figure 3

a bottom view of a compressor unit according to the invention,

Figure 4

a plan view of the lower rollers of the drafting system according to the invention and

Figure 5

a sectional front view of the drafting system according to the invention.

In the following description of the illustrated alternative exemplary embodiments, the same reference symbols are used for features which are identical in their design and / or mode of operation and / or at least comparable. Unless they are explained in detail again, their configuration and / or mode of operation corresponds to the configuration and mode of operation of the features already described above.

Figure 1 shows a longitudinal section through a closed drafting system 1 according to the invention. The drafting system 1 has a pair of input rollers 2, a pair of drafting system aprons 3 and output rollers 4. In the output rollers 4, a pressure roller 6 and a take-off roller 7 are arranged on a lower drafting roller 5. In the closed drafting system 1, a roller 2.2 of the input roller pair 2 shown above, an upper apron 3.2 and the pressure roller 6 and the take-off roller 7 rest on a lower roller 2.1, an apron 3.1 and the drafting roller 5.

The pressure roller 6 and the take-off roller 7 are arranged in a pressure roller unit 8. The pressure roller unit 8 comprises a base body 9 and a spring 10, which acts on a compressor unit 11. Upper roller 2.2, upper apron 3.2 and the pressure roller assembly 8 with the pressure roller 6 and the take-off roller 7 are fastened in a pressure arm of the drafting unit 1, not shown. The pressure roller 6 and the take-off roller 7 are each designed as twin rolls, i. That is, two adjacent drafting systems 1 can be operated via a pressure arm and that two of the rollers 6, 7 are connected to one another via a common axis.

The compressor unit 11 arranged in the pressure roller unit 8 has a first contact surface 12, a second contact surface 13 (not visible in this illustration) and a third contact surface 14. The first and the second contact surface 12, 13 are each located between the pressure roller 6 and the take-off roller 7. The third contact surface 14 is arranged between the axially spaced-apart pressure rollers 6 of the roller twin. The first, the second and the third contact surface 12, 13, 14 are supported on the drafting roller 5. They preferably have a curvature which essentially corresponds to the cylindrical shape of the drafting roller 5. With the spring 10, the compressor unit 11 with its contact surfaces 12, 13 and 14 pressed on the drafting roller 5. For this purpose, the spring 10 is rotatably connected to a receiving element 23 of the compressor unit 11.

The first, second and third contact surfaces 12, 13 and 14 are arranged on a holder 24 of the compressor unit 11. While the first and second contact surfaces 12, 13 are spaced apart from one another in the axial direction of the pressure roller 6 and the take-off roller 7, the third contact surface 14 is arranged in the axial direction essentially centrally between the two first and second contact surfaces 12, 13 and is located spaced in the circumferential direction of the drafting roller 5. As a result, the third contact surface 14 is able to provide precise support for the first and second contact surfaces 12, 13. The first and second contact surfaces 12, 13 are thus arranged in a very stable manner on the drafting roller 5 by the third contact surface 14. This means that they can be assigned to each other very precisely. The precise positioning of the first and second contact surfaces 12, 13 by the third contact surface 14 ensures that a fiber structure 17 can be guided reliably in the compressor unit 11 without fibers of the fiber structure 17 being able to escape laterally from the compressor unit 11.

A particular advantage of this support of the contact surfaces 12, 13 by the third contact surface 14 is that the pressure roller unit 8 can be arranged rotated around the drafting roller 5 in such a way that a negative curtain angle 20 of the pressure roller 6 with respect to the drafting roller 5 can be set. The negative curtain angle 20 means that the center of the pressure roller 12 is arranged in front of the center of the pressure roller 5 with respect to the running direction of the fiber structure 17. This also has the effect that a wrap angle 21 of the fiber structure 17 on the take-off roller 7 is small, ie less than 90 °, preferably less than 30 °. This small wrap angle 21 results in very stable spinning, since thread breaks can be significantly reduced as a result. Negative curtain angles 20 or the pressure roller unit 8 rotated in this way are possible because the support of the first and second contact surfaces 12, 13 does not take place between the pressure roller 6 and the apron 3.2, but laterally offset between the pressure rollers 6 of two adjacent drafting units 1.

The compressor unit 11 is coupled to a traversing tongue 15 of the traversing device. The traversing tongue 15 is also connected to a compressor 16, which guides the fiber structure 17 into the drafting device 1. The traversing tongue 15 is coupled to the compressor unit 11 with a fork 18 which surrounds the compressor unit 11 in the region of the third contact surface 14. The third contact surface 14 thus forms a coupling element for the traversing device. The coupling is designed such that the compressor unit 11 can slide out of the traversing tongue 15 or the fork 18 when the drafting device 1 is opened. If the drafting device 1 is closed again, the compressor unit 11 or the third contact surface 14 is inserted again into the fork 18 of the traversing tongue 15.

The traversing tongue 15 is able to move the compressor unit 11 back and forth in the same way when it is moved back and forth in the axial direction of the rollers. This traversing of the compressor unit 11 has the effect that the fiber structure 17 is clamped on the drafting roller 5 at different axial positions of the pressure roller 6 or take-off roller 7. The wear of the pressure roller 6 or take-off roller 7 is thereby reduced since the contact points can be changed continuously.

In order to be able to position the traversing tongue 15 in the radial direction of the drafting roller, the traversing tongue 15 or the fork 18 has a contact surface 19 with which it rests on the drafting roller 5. This contact surface 19 thus slides back and forth in the axial direction when the traversing tongue 15 axially traverses.

Figure 2 shows a longitudinal section through the drafting system 1 Figure 1 in the open position. The upper input roller 2.2, the upper apron 3.2 and the pressure roller assembly 8 with the pressure roller 6 and the take-off roller 7 are lifted off the lower roller 2.2, the apron 3.1 and the drafting roller 5. From this illustration, in particular, the coupling between the compressor unit 11 and the traversing tongue 15 can be seen. The compressor unit 11 is removed together with the pressure roller unit 8 from the coupling with the traversing tongue 15 or its fork 18. The third contact surface 14 is thus removed from the fork 18. The traversing tongue 15 and the fork 18 remain on the drafting roller 5 by means of the bearing surface 19. When the drafting device 1 is closed again, the compressor unit 11 is lowered again together with the other components, as a result of which the third contact surface 14 comes again into the fork 18, rests on the pressure roller 5 and can be guided laterally through the fork 18, as in FIG Figure 1 shown.

In Figure 3 a bottom view of a compressor unit 11 according to the invention is shown. The central component of the compressor unit 11 is the holder 24. The first, second and third contact surfaces 12, 13 and 14 are arranged at the respective ends of the holder 24. A compression region 22 is provided in each of the first and second contact surfaces 12, 13. The fiber structure 17 reaches this compression area 22 and is compressed therein. This compression area 22, together with the drafting roller 5, on which the first and second contact surfaces 12, 13 rest, forms a largely closed channel, which prevents individual phases of the fiber structure 17 from escaping laterally from the channel of the compression area 22.

About the receiving element 23 that in this embodiment is on the opposite side of the bracket 12, 13 and 14 of the bracket 24 is located, the compressor unit 11 is connected to the pressure roller unit 8 by means of the spring 10 (see Figure 1 and 2nd ).

The coupling between the traversing tongue 15 and the compressor unit 11 takes place via the bracket 24 or the shape of the bracket 24 in the region of the third contact surface 14. The fork 18 of the traversing tongue 15 encompasses the bracket 24 or the third contact surface 14 laterally. When the traversing tongue 15 moves transversely to the course of the fiber structure 17, the compressor unit 11 is laterally moved back and forth together with the traversing tongue 15. The contact points between the third contact surface 14 and the fork 18 of the traversing tongue 15 are cheeks 25 of the tongue 15 and flanks 33 of the third contact surface 14 or the holder 24. It is advantageous if there is little play between the cheeks 25 and the flanks 33 is to facilitate threading when coupling the compressor unit 11 to the traversing tongue 15. It is further provided in this embodiment that the cheeks 25 are bevelled for easier threading. Thus, even with a small lateral offset between the traversing tongue 15 and the compressor unit 11, it is possible for a coupling to take place when the drafting unit 1 is closed.

Figure 4 shows a top view of the lower rollers of the drafting system 1 according to the invention and the traversing device which comprises the traversing tongue 15 and a traversing rod 28. The illustration also shows two drafting systems 1 arranged parallel to one another. The traversing tongue 15 is arranged between the two drafting systems 1. The traversing tongue 15 is also attached to the traversing rod 28 and can be moved back and forth according to the double arrow direction C.

In contrast to the previous exemplary embodiment, the traversing tongue 15 now has an eyelet 29 instead of a fork 18. The contact surface 19 of the traversing tongue 15 can be made wider and more stable through the eyelet 29.

The representation of this Figure 4 also shows the structure of the drafting roller 5. This drafting roller 5 has cylinder sections which have corrugated areas 26 and smooth areas 27. The first and second contact surfaces 12, 13 rest on the corrugated areas 26 on the drafting roller 5. The third contact surface 14, on the other hand, is located between the two drafting systems 1 in the smooth region or cylinder section 27 of the drafting system roller 5 and is supported there.

In the corrugated area 26 of the drafting roller 5, a dashed line 30 shows a printing line 30 for the pressing roller 6 and a printing line 31 for the take-off roller 7. It can be seen from this that the pressure line 30 for the pressure roller 6 is offset in the direction of the lower aprons 3.1 with respect to a center line S of the drafting roller 5. A curtain V thus becomes negative. This is possible because the support for the first and second contact surfaces 12, 13 is not arranged between the apron 3.1 and the pressure roller 6, but offset laterally in the smooth area 27 of the drafting roller 5. This also causes the pressure line 31 of the extraction roller 7 to move closer to the center line S and thus has the effect that the wrap around the take-off roller 7 by the fiber structure 17 is only very slight.

In Figure 5 is a sectional front view of the drafting system 1 according to the invention. The cut is made through the first, second and third contact surfaces 12, 13 and 14. In the first and second contact surfaces 12, 13, the compression area 22 can be seen, which forms a channel through which the fiber structure 17 can be conveyed. The two contact surfaces 12 and 13 rest on the corrugated area 26 of the drafting roller 5. The third contact surface 14 can be seen between the two first and second contact surfaces 12 and 13. This third contact surface 14 lies in the smooth area 27 of the drafting roller 5. The bearing surface 19 of the traversing tongue 15 also lies in this area.

In this exemplary embodiment, both the cheeks 25 of the traversing tongue 15 and the flanks 33 of the third contact surface 14 are chamfered. This makes it very easy to thread the third contact surface 14 into the fork 18 or eyelet 29 of the traversing tongue 15, even if there is a certain offset between the traversing tongue 15 and the third contact surface 14.

The corrugated area 26 of the drafting roller 5 has a slightly larger diameter than the smooth area 27 of the drafting roller 5. In order nevertheless to obtain stable and continuous contact of the first and second contact surfaces 12, 13 with the pressure roller 6, there is a corresponding height offset h between the first and second contact surfaces 12, 13 and the third contact surface 14 are present. The third contact surface 14 or its holder 24 thus has a length that compensates for this difference in diameter of the drafting roller 5.

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 symbol list

1

Drafting system

2nd

Input roller pair

2.1

lower roller

2.2

Top roller

3rd

Drafting apron pair

3.1

bottom strap

3.2

top strap

4th

Exit rollers

5

Drafting roller

6

Pressure roller

7

Take-off roller

8th

Pressure roller unit

9

Basic body

10th

feather

11

Compressor unit

12

first contact surface

13

second contact surface

14

third contact surface

15

Traversing tongue

16

compressor

17th

Fiber dressing

18th

fork

19th

Contact surface

20th

negative curtain angle

21st

Wrap angle

22

Compression range

23

Receiving element

24th

bracket

25th

cheek

26

corrugated area

27th

smooth area

28

Traversing rod

29

eyelet

30th

Printing line printing roller

31

Print line take-off roller

32

axis

33

Flank

C.

Traversing movement

S

Center line

V

curtain

H

Height offset

Claims (15)

Compressor unit for two drafting systems (1) of a textile machine arranged side by side - With a bracket (24), - A first and a second contact surface (12, 13) are arranged on the holder (24), which can rest against a drafting roller (5) during operation of the drafting system (1), - A compression area (22) being arranged on each of the contact surfaces (12, 13) in order to be able to compress a fiber structure (17) guided lengthwise through the compression area (22), - The first and the second contact surface (12, 13) are spaced apart from one another transversely to the compression regions (22) and with a coupling element for a traversing device for traversing the compressor unit (11) transversely to the two compression regions (22), characterized by - That the compressor unit (11) has a third contact surface (14) for supporting the compressor unit (11) during operation of the drafting device (1) on the drafting device roller (5) and - The third contact surface (14) between the first and the second contact surface (12,13) and along the compression areas (22) is arranged offset. Compressor unit according to the preceding claim, characterized in that the third contact surface (14) forms the coupling element for the traversing device. Compressor unit according to one or more of the preceding claims, characterized in that the third contact surface (14) has flanks (33) for contacting the traversing device. Compressor unit according to one or more of the preceding claims, characterized in that the flanks (33) are chamfered for threading into the traversing device. Compressor unit according to one or more of the preceding claims, characterized in that the third contact surface (14) is arranged on the holder (24). Compressor unit according to one or more of the preceding claims, characterized in that a holding element (23) for holding the compressor unit (1) in a pressure roller unit (8) of the drafting units (1) is arranged on the holder (24). Compressor unit according to one or more of the preceding claims, characterized in that the first and the second contact surface (12, 13) each have a curvature which essentially corresponds to a corrugated cylinder section (26) of the drafting roller (5) intended for them, and third contact surface (14) has a length which projects into this cylinder section (26) in order to be able to be supported on an unerrated cylinder section (27) of the drafting roller (5). Pressure roller unit for two drafting systems (1) of a textile machine arranged side by side, - With a compressor unit (11), - With a base body (9) and - With two roller twins, which consist of two pressure rollers (6) and two take-off rollers (7) and which are accommodated in the base body (9), and the roller twins can be placed on a common drafting roller (5), - Wherein the pressure roller unit (8) at least one means for fastening the compressor unit (11) on the base body (9) of the pressure roller unit (8) and - The compressor unit (11) has a first and a second contact surface (12, 13) which can rest on the drafting roller (5) during operation of the drafting system (1), and - A compression area (22) is arranged on each of the two contact surfaces (12, 13) in order to be able to compact a fiber structure (17) guided lengthwise through the compression area (22), - The first and the second contact surface (12, 13) are spaced apart from one another transversely to the compression regions (22) and are each arranged between the pressure roller (6) and the take-off roller (7) of the two roller twins and - The compressor unit (11) is arranged to be movable transversely to the two compression areas (22) on the base body (9) of the pressure roller unit (8), characterized by - That the compressor unit (11) is designed according to the preceding claims, wherein - It has a third contact surface (14) for supporting the compressor unit (11) during operation of the drafting device (1) on the drafting device roller (5) and - The third contact surface (14) between the first and the second contact surface (12,13) and along the compression areas (22) is arranged offset. Drafting system with a drafting roller (5) at the outlet of the drafting system (1) and with a pressure roller unit (8) for two drafting units (1) of a textile machine arranged side by side, - The pressure roller assembly (8) has a base body (9) and two roller twins, which consist of two pressure rollers (6) and two take-off rollers (7) and which are accommodated in the base body (9) and the roller twins on the drafting roller (5) are attachable, - A compressor unit (11) has a first and a second contact surface (12, 13), which bear against the drafting roller (5) during operation of the drafting system (1) and - A compression area (22) is arranged on each of the two contact surfaces (12, 13) in order to be able to compact a fiber structure (17) guided lengthwise through the compression area (22), - The first and the second contact surface (12, 13) are spaced apart from one another transversely to the compression regions (22) and are each arranged between the pressure roller (6) and the take-off roller (7) and - The drafting device (1) has a traversing device and - The compressor unit (11) has a coupling element for the traversing device, for traversing the compressor unit (11) transversely to the two compression regions (22), characterized by - That the compressor unit (11) is designed according to the preceding claims, wherein - It has a third contact surface (14) for supporting the compressor unit (11) during operation of the drafting device (1) on the drafting device roller (5) and - The third contact surface (14) between the first and the second contact surface (12,13) and along the compression areas (22) is arranged offset. Drafting system according to the preceding claim, characterized in that the third contact surface (14) forms the coupling element for the traversing device. Drafting system according to one or more of the preceding claims, characterized in that the third contact surface (14) has flanks (33) for contacting the traversing device. Drafting system according to one or more of the preceding claims, characterized in that the traversing device has a traversing tongue (15) which engages around the third contact surface (14) as a fork (18) or eyelet (29) and / or a contact surface (19) for resting on it on the drafting roller (5). Drafting system according to one or more of the preceding claims, characterized in that the fork (18) or eyelet (29) has cheeks (25) which cooperate with the flanks (33) of the third contact surface (14) and the flanks (33) and / or the cheeks (25) are preferably chamfered for threading the third contact surface (14) into the traversing device when the pressure roller unit (8) is placed on the drafting roller (5). Drafting system according to one or more of the preceding claims, characterized in that the pressure roller (6) forms a negative curtain (V) to the drafting roller (5). Drafting system according to one or more of the preceding claims, characterized in that the take-off roller (7) is wrapped at an angle (21) of less than 90 °, preferably less than 30 °, by a fiber structure (17) emerging from the drafting system (1) .

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