EP2980286A1 - Roller stretching assembly of a workstation of a textile machine that processes staple fibres and textile machine using the same - Google Patents

Abstract

The invention relates to a roller draw assembly (1) of a workstation of a staple fiber processing textile machine, in particular a spinning machine, a roving machine or a knitting machine, for warping at least one strand-like staple fiber band (3) entering the roller draw assembly (1) in a transport direction (T). wherein the roller draw assembly (1) has at least one draft zone delimited by an inlet side roller arrangement (6) and an outlet side (7) roller arrangement, the inlet side roller arrangement (6) comprising an inlet roller (8) and an inlet counter roller (9) cooperating therewith. and the outgoing-side roller arrangement (7) comprises an outlet roller (10) and an outlet counter-roller (11) cooperating therewith, and wherein the roller-stretching arrangement (1) comprises an endless belt (12) which separates the inlet roller (8) and one of the inlet roller (8 ) in the transport direction (T) spaced Riemchenführ (19) wraps around and thereby guided. According to the invention, the endless belt (12) is assigned at least one fixedly fixed fiber guiding element (13) which is elastic at least in sections, wherein the fiber guiding element (13) controls the staple fiber bond (3) during operation of the roller stretching device (1) against one between the Entry roller (8) and the Riemchenführung (19) extending portion of the Endlosriemchens (12) presses and this at least partially adapts to the contour of the Endlosriemchens (12).

Description

The present invention relates to a Walzenstreckanordnung a job of a staple fiber-processing textile machine, in particular a spinning machine, a roving producing machine or a knitting machine for warping at least one incoming in a direction of transport in the roll drawstring stranded staple fiber composite, wherein the Walzenstreckanordnung has at least one draft zone, which from a an inlet side roller assembly and an outlet side roller assembly is limited, wherein the inlet side roller assembly includes an inlet roller and a co-operating therewith counter roller and the outlet side roller assembly an outlet roller and a cooperating with this outlet counter roll, and wherein the Walzenstreckanordnung comprises an endless belt comprising the inlet roller and one of the Inlet roller wraps around in the transport direction spaced strap guide and is guided by it.

In addition, a staple fiber-processing textile machine, in particular in the form of a spinning machine, a roving-producing machine or a knitting machine, is proposed.

A generic Walzenstreckanordnung is from the DE 103 21 893 A1 known and has, for example, a driven and stationarily mounted inlet counter-roller and a driven and stationary mounted counter-outlet roller. The inlet counter-roller is delivered to a moving and loaded inlet roller, so that the incoming staple fiber bond between the inlet roller and the inlet counter-roller is guided by clamping, wherein the staple fiber dressing and the inlet roller is entrained by means of frictional engagement by rotation of the inlet counter-roller. Likewise is the Outlet counter roll delivered a movable and loaded discharge roll, so that the leaking staple fiber bond between the discharge roll and the outlet counter roll is also guided by clamping, the staple fiber strand and the discharge roll is taken by means of frictional engagement of the rotating discharge roll. The distortion of the staple fiber composite is now effected by the outfeed counter-roller being driven at a significantly higher peripheral speed than the entry counter-roller, so that the fibers in the said delay zone are moved relative to one another, namely pulled apart in a transport direction.

In order to prevent individual fibers from being released from the staple fiber bond in the drafting zone, which is more critical the finer the staple fiber bandage, a lower fiber guiding apron and an upper fiber guiding apron delivered thereto are provided which is pressed against the lower fiber guiding apron Staple fiber strand between two Faserführungsriemchen is performed. The lower Faserführungsriemchen surrounds the inlet counter-roller and is thereby driven frictionally. Similarly, the upper Faserführungsriemchen circulates the inlet roller and is also driven frictionally.

A disadvantage of this known solution is the fact that the individual Faserführungsriemchen are subject to constant wear and have different production tolerances, which may affect the uniformity of the stretched in the Walzenstreckanordnung staple fiber Association. In addition, for the movement of Faserführungsriemchen a certain amount of energy required, which is not negligible over the life of a corresponding arrangement. Finally, the replacement of corresponding Faserführungsriemchen is always associated with a corresponding amount of time, which also has a negative effect on the overall productivity of the corresponding textile machine.

The object of the present invention is a generic roller stretching arrangement and to propose a staple fiber processing textile machine comprising these, which differ in a positive manner from the known prior art.

The object is achieved by a roller draw assembly and a staple fiber-processing textile machine with the features of the independent claims.

According to the invention, the roller stretching arrangement is characterized by the fact that the endless belt, which surrounds the inlet roller and the abovementioned belt guide which follows the inlet roller in the transport direction (and thus that in the transport direction) DE 103 21 893 A1 at least one fixed fixed fiber guide element is assigned. In other words, it is provided that instead of the known in the prior art lower Faserführungsriemchens a fiber guide element is used, which does not have to be actively set in motion. Thus, already the energy can be saved, which is necessary in the prior art for driving the lower Faserführungsriemchens. In addition, it is provided that the fiber guide element is at least partially elastic, wherein the fiber guide element presses the staple fiber strand during operation of the roller draw against a running between the inlet roller and the Riemchenführung section of Endlosriemchens and here at least partially adapts to the contour of the Endlosriemchens.

The term "elastic" is understood in the context of the invention, the property of the fiber guiding element that deforms under load and after decreasing the load without permanent deformation returns to its initial state (the deformation is in this case preferably in the range of a few millimeters or even less than a millimeter ). This makes it possible that the distance between the Endlosriemchen and this associated fiber guide element to the thickness of between can adapt to both sections guided staple fiber association. If a thick part passes the region between the fiber guiding element and the endless belt, then the fiber guiding element is pressed away from the endless belt slightly. If the thick spot has passed the said area, then the fiber guide element approaches the Endlosriemchen again. As a result, there is always a reliable and uniform guidance of the staple fiber strand.

Incidentally, the fiber guiding element should, moreover, be designed to be elastic in a direction perpendicular to the direction of transport.

Furthermore, in the context of the present invention, a "strand-shaped staple fiber composite" is understood to mean an elongate structure of individual fibers whose length is substantially less than their thickness. The strand-like staple fiber bandage may in particular be a sliver produced on a carding machine, combing machine or track and substantially untwisted, which is processed on a flyer equipped with a roller drawing arrangement to form a roving provided with a protective rotation. Likewise, the strand-like staple fiber bandage may be a roving provided with a protective rotation, which is processed on a spinning machine equipped with a roll drawing arrangement, for example on a ring spinning machine, into a finished twisted yarn.

The roll drawing arrangement according to the invention is suitable for spinning preparation machines, such as roving producing machines, for spinning machines, such as ring spinning machines, or for knitting machines, especially if they have a plurality of jobs, where each a roving or a yarn is produced or processed. It is also conceivable that the Walzenstreckanordnung be fed to a job multiple staple fiber associations, which are warped together.

Furthermore, a delay zone is understood to mean the region between the nip lines of two adjacent pairs of rolls (input roll and input counter roll or output roll and output counter roll) in which a staple fiber strand is warped. An input counter roll or an output counter roll is preferably a fixedly mounted and driven roller and an input roller or an output roller a movably mounted and pressed against the input counter roll or output counter roll roller. An endless belt is an endless structure which revolves around the inlet roller and the belt guide in such a way that, viewed in the transport direction, it bears against the staple fiber structure at least over a substantial part of the drafting zone and moves correspondingly to the staple fiber belt. Of course, the roll stretching arrangement may comprise further rolls and / or straps, so that the invention can also be implemented in roll drawing arrangements comprising a plurality of zones of distortion.

The Riemchenführung can be formed by a parallel to the axis of rotation of said rollers extending rod-shaped element, which is looped by the Endlosriemchen over part of its circumference.

It is particularly advantageous if the fiber guide element is arched at least partially convexly in the direction of Endlosriemchens, since the Endlosriemchen in the fiber guide element opposite area for driving usually usually one, based on the fiber guide element, concave shape takes (the strand of the Endlosriemchens opposite the fiber guide element is in usually driven by the corresponding inlet roller in the direction of the belt guide "pushing"). Fiber guide element and Endlosriemchen form in this case a curved fiber guide channel, whose cross-section is substantially constant, thus ensuring a reliable guidance of the staple fiber composite. Of course, it is conceivable that only certain portions of the fiber guiding element have a convex shape. For example it would be conceivable that the fiber guide element in its the output roller and output counter-roller facing end region has a slightly concave shaped relative to the Endlosriemchen, to allow the smoothest possible transition of the staple fiber composite from the fiber guide element in the clamping region of the output roller and output counter roll. In particular, it is also advantageous if viewed in the transport direction, the fiber guide element extends beyond the Riemchenführung out and ends shortly before the aforementioned clamping area. The staple fiber strand is thereby guided as long as possible, so that false distortions can be minimized.

Furthermore, it is advantageous if the section of the fiber guiding element which is in contact with the staple fiber structure during operation of the roll stretching arrangement has a spatial extent in the transport direction, the amount of which corresponds to at least 50%, preferably at least 70%, of the distance between the axes of rotation of the inlet roll and the outlet roll , The contact area between the fiber guiding element and the staple fiber strand is in this case particularly long (as viewed in the transporting direction), so that reliable guidance of the staple fiber strand is ensured. Incidentally, the width of the fiber guiding element running perpendicularly to said spatial extent and parallel to the axes of rotation of said rollers should be between 2 cm and 6 cm, at least in the region assigned to the endless belt.

It is also advantageous if the fiber guiding element rests with a bias on the Endlosriemchen or between the fiber guide element and the Endlosriemchen guided staple fiber bond. In other words, it is advantageous if the fiber guide element has a shape that ensures that it already rests against the opposite section of the endless belt before the roll drawing assembly is fed to a staple fiber strand or before the roll drawing assembly is completely closed and loaded (the infeed roll and the outlet roll can usually be lifted from the corresponding counter rollers to increase the accessibility of the respective rollers for maintenance purposes or to relieve the rollers when not operating the Walzenstreckanordnung). The staple fiber strand is guided in this case from the entry into the Walzenstreckanordnung under a certain clamping force, regardless of its thickness.

It is also advantageous if the fiber guide element has a resiliently formed portion. The fiber guiding element in this case is not elastic as a whole, such as a rubber element. On the contrary, at least the region of the fiber guiding element which is in contact with the staple fiber structure during operation of the roll drawing arrangement consists of a material which is rigid or hard (for example metal). The elasticity of the fiber guiding element in this case arises from its flat shape, which allows bending in the direction of the endless belt and in the direction opposite thereto.

For example, it is advantageous if at least the resiliently formed portion of the fiber guiding element is formed by a leaf spring. It is also conceivable to manufacture the entire fiber guide element from one or more leaf springs, wherein a part of the leaf spring (s) may be bent, and this area in the function of the said holding section on a support of the roll drawing arrangement or a staple fiber processing textile machine having the roll drawing arrangement can be fixed.

In particular, it brings advantages when the fiber guiding element has at least in sections, and preferably in the region in which it is in contact with the staple fiber structure during operation of the roll drawing assembly, a perpendicular to the axes of rotation of said rolls thickness, the amount between 0.05 mm and 1.0 mm, preferably between 0.05 mm and 0.7 mm. Corresponding values allow one flexible and also high-frequency movement of the corresponding section relative to Endlosriemchen and the associated adjustment of the distance between the fiber guide element and Endlosriemchen and still guarantee a long service life of the fiber guide element. Of course, it is also conceivable in this context that the thickness of the fiber guiding element varies in the transport direction, for example continuously increasing or decreasing in the direction mentioned.

The width of the fiber guiding element running parallel to the axes of rotation preferably has an amount between 10 mm and 70 mm, preferably an amount between 15 mm and 50 mm.

It is also extremely advantageous if the fiber guiding element consists at least partially of metal, ceramic and / or plastic, in particular Teflon, polyamide, and / or polyethylene. Such materials are wear-resistant, stable and can be formed with low friction, so that they are particularly well suited for a fiber guide element.

Preferably, the fiber guiding element comprises at least portions of a material whose modulus of elasticity has an amount between 100,000 N / mm ² and 300,000 N / mm ² , preferably between 140,000 N / mm ² and 240,000 N / mm ² . Preferably, the entire fiber guide element consists of a material with a corresponding modulus of elasticity.

It is likewise advantageous if the fiber guiding element has a friction-reducing coating, it being possible for the coating to comprise one or more layers. As a result, it is also possible to use for the main body of the fiber guiding element materials which in themselves have high coefficients of friction but other advantageous properties, such as, for example, simple machinability. For example, the fiber guiding element may have a basic body made of metal (for example in the form of a flat leaf spring), at least on the end of the endless strap facing side have a graphite coating or a PTFE coating.

Particular advantages arise when the fiber guiding element comprises a holding section, via which it is fastened, preferably detachably, to a carrier of the roller stretching arrangement. By "releasable" is meant that the fiber guiding element can be attached and removed from the carrier without damaging the carrier or the fiber guiding element and without the need for a tool. As a result, the replacement of worn fiber guide elements is possible without much effort.

It is also advantageous if the holding portion of the fiber guide element by means of a magnet and / or by positive engagement, for example by means of a clip connection, is secured to the carrier. Likewise, it is conceivable that the fiber guiding element is fastened to the carrier by means of a screw fastening, a snap fastening or a clamp fastening. In any case, the said fastening solutions allow a quick replacement of a corresponding fiber guide element, without the need for special tool would be used.

Furthermore, it is advantageous if the fiber guiding element is supported by at least two supports spaced apart in the transporting direction, wherein it is preferably provided that a region of the fiber guiding element extending between the two supports is designed to be elastically deformable in a direction perpendicular to the transporting direction. For example, it is conceivable that the fiber guide element in the region of a first support is fixed and rigidly fixed and in the region of a second support only rests on this and thus can oscillate freely in a certain range. The second support is in this case preferably positioned in the transport direction after the first support. In particular, it is advantageous, the first support in the region of the inlet roller and the inlet counter roll and the second support in the region of the outlet roller and the outlet counter-roller, wherein the intermediate portion of the fiber guide element opposite the Endlosriemchen and can conform to the contour of its contour or the thickness of the staple fiber composite.

It is also advantageous if at least one of the supports is elastic and formed, for example, by a leaf spring element. For example, it would be conceivable for the abovementioned abutment to be fastened over a first region to a carrier of the roller draw assembly or to a staple fiber-processing textile machine comprising the latter and to contact the fiber guide element via a second, preferably freely movable, region. The fiber guide element is supported in this case by two supports, wherein one of the supports is designed to be elastic in the direction of the endless belt. As a result, one obtains a support of the fiber guide element, which can give in particular at large thick points of the continuous staple fiber association in addition.

According to an advantageous development of the invention, it is provided that a first sliding friction coefficient occurring between the endless belt and the staple fiber structure is greater than a second sliding friction coefficient occurring between the fiber guiding element and the staple fiber structure. In this way, it can be ensured that the friction between the staple fiber strand and the Endlosriemchen substantially in the area of static friction, while the friction between the staple fiber strand and the fiber guide element substantially in the field of sliding friction takes place, so that the staple fiber strand evenly with the speed of Endlosriemchens is transported. In this way, in particular, it can be achieved that the individual fibers are transported in the stretched state. This ultimately benefits the quality of the warped staple fiber composite. In addition, due to the relatively smooth fiber guide element, the resulting friction between Endlosriemchen and fiber guiding element in the area adjacent to the staple fiber strand can be reduced. This lowers the energy consumption of the staple fiber processing textile machine having the roll drawing arrangement as well as the wear, in particular of the endless loop. In addition, it can be effected so that the Endlosriemchen when it is pushed over the fiber guide element, not corrugated.

According to an advantageous development of the invention, it is provided that said first sliding friction coefficient is at least 120%, preferably at least 150%, particularly preferably at least 180%, of said second sliding friction coefficient. If the stated minimum values are met, the aforementioned advantages can be achieved particularly well.

According to an advantageous embodiment of the invention, it is provided that the fiber guide element is at least partially antistatic and / or electrically grounded. As a result, adhesion of the endless belt and / or the staple fiber bandage to the fiber guiding element can be prevented by electrostatic forces. Antistatic properties can z. B. can be achieved by the fiber guide element is made of an electrically conductive material. But it is also possible that the fiber guide element has a conductive coating.

Furthermore, it is advantageous if the fiber guide element in the transport direction protrudes a little way beyond the discharge side seen in the transport direction bearing (ie the support, which is placed closer to the outlet side roller assembly) and this ends in the vicinity of the outlet counter roll, so that a in the transport direction of the said support downstream fiber guide section is present. This guide section, on the one hand, effects an outlet-side guidance of the staple fiber dressing so that it passes uniformly into the outlet-side roller arrangement. On the other hand, it is advantageous if said guide section only a few millimeters or even just a few tenths of a millimeter in front of the adjacent outlet counter roll ends. In this case, the gap between the fiber guiding element and the outlet counter-roller rotating during operation of the roller stretching arrangement is so small that entrained air, which is necessarily entrained by the rotating outlet counter-roller, does not or only to a small extent in the region between the outlet roller and the outlet counter-roller and thus into reach the area of the staple fiber composite. Rather, the entrained air escapes to both sides of the fiber guide element. A negative influence on the structure of the staple fiber composite is thus reduced or even completely excluded.

Finally, the invention relates to a staple fiber-processing textile machine, in particular in the form of a spinning machine, a roving producing machine or a knitting machine, which is provided according to the invention that it has one or more Walzenstreckanordnungen according to previous or subsequent description, wherein the respective features individually or in any combination can be realized, as far as no technical contradictions arise and as long as the fiber guide element is at least partially elastic.

Figur 1

eine Seitenansicht einer erfindungsgemäßen Walzenstreckanordnung ohne eingelegten Stapelfaserverband,

Figur 2

eine perspektivische Ansicht der in den restlichen Figuren gezeigten Ausführungsform eines erfindungsgemäßen Faserführungselements,

Figur 3

die Ausführung gemäß Figur 1 im Betrieb der Walzenstreckanordnung, und

Figur 4

eine alternative Ausführungsform einer erfindungsgemäßen Walzenstreckanordnung.

Further advantages of the invention are described in the following exemplary embodiments. It show, each schematically:

FIG. 1

a side view of a Walzenstreckanordnung invention without inserted staple fiber strand,

FIG. 2

a perspective view of the embodiment of a fiber guide element according to the invention shown in the remaining figures,

FIG. 3

the execution according to FIG. 1 during operation of the roller draw assembly, and

FIG. 4

an alternative embodiment of a roller stretching device according to the invention.

FIG. 1 shows a side view of a roll stretching device 1 according to the invention in the idle state (ie without inserted staple fiber strand 3). In the embodiment shown, the roll stretching arrangement 1 has an inlet-side roll arrangement 6, which during operation of the roll stretching arrangement 1 is first passed through by the supplied staple fiber structure 3 and which comprises an inlet roll 8 and an inlet counter roll 9 assigned thereto. Similarly, an outlet-side roller assembly 7 is provided, which correspondingly comprises an outlet roller 10 and an outlet counter-roller 11 (the rollers of the respective roller assemblies 6, 7, which are rotatably mounted about respective axis of rotation 4 and are driven and loaded in a known and therefore unspecified manner, Of course, at this stage, they can already abut one another by a corresponding pressure load).

In addition, the roller draw assembly 1 comprises an endless belt 12, as known in the art. The Endlosriemchen 12 wraps in the case shown the inlet roller 8 and a, for example, perpendicular to the plane and rod-shaped, Riemchenführung 19 which can be rigidly or fixed fixed itself (conceivable is also a parallel to the plane movable storage and a corresponding pressure load, which holds the strap guide 19 in the position shown, for example via a support, not shown).

According to the invention, it is now provided that the endless belt 12 is assigned a fiber guiding element 13 which is at least partially elastic (for the definition of the term "elastic" is based on the above Description referenced).

The fiber guide element 13 may be present for example as a leaf spring 15, wherein a possible embodiment in FIG. 2 is shown (on the representation of in FIG. 2 shown reference numerals in the other figures was omitted for reasons of clarity). As FIG. 1 in synopsis with FIG. 2 can be seen, the fiber guiding element 13 preferably comprises a holding portion 16, via which it is on a corresponding carrier 17 of the roll stretching 1 and a roller stretching 1 having staple fiber processing textile machine, preferably releasably attached.

In addition, the fiber guide element 13 has a resilient portion 14, which preferably already with a certain bias on the Endlosriemchen 12 is present before a staple fiber strand 3 is introduced into the Walzenstreckanordnung 1 (see FIG. 1 ). In particular, it is advantageous in this case if the fiber guiding element 13 is supported in the direction away from the endless belt 12 by two supports 5 which are spaced apart from one another in the transporting direction T and the contour of the fiber guiding element 13 in one between the two Auflagern 5 lying area of the contour of the Endlosriemchens 12 adapts.

Now, if a staple fiber strand 3 reaches the area of the fiber guiding element 13 (see FIG FIG. 3 ), this can be pushed by its elasticity a little way from the Endlosriemchen 12 (where it deforms correspondingly elastic). This finally ensures that the staple fiber strand 3 is guided on both sides by the circumferential Endlosriemchen 12 and the fiber guide element 13, wherein the distance between Endlosriemchen 12 and fiber guide element 13 by its elasticity in the direction of FIG. 1 can be adjusted continuously (as a precautionary measure at this point with reference to the Figures 3 and 4 pointed out that the Endlosriemchen 12 and the fiber guide element 13 during the passage of the staple fiber strand 3 of course directly abut this. The distances between the staple fiber strand 3 and the endless belt 12 or the staple fiber strand 3 and the fiber guiding element 13 shown in the abovementioned figures are merely for better graphic representability and distinctness of the individual sections).

Furthermore, the figures show that it is advantageous if the fiber guide element 13 protrudes in the transport direction T a piece far beyond the seen in the transport direction T outlet side support 5 and this ends in the vicinity of the outlet counter roll 11, so that in the transport direction T said support 5 downstream and elastically deformable fiber guide section 20 is present. With regard to the advantages in this regard, reference is made to the above description.

In order to enable the said movement of the fiber guiding element 13 or its elastic region at the desired frequency, it has proven useful to contact the fiber guiding element 13 or at least the part of the fiber guiding element 13 which is in contact with the staple fiber strand 3 during operation with the roll drawing device 1 to manufacture from a spring steel sheet that has a thickness D (see FIG. 2 ) of less than one millimeter.

Finally shows FIG. 4 a further possible embodiment of the support of a fiber guide element 13 according to the invention while the fiber guide element 13 in the FIGS. 1 and 3 is supported by two rigid supports 5, the seen in the transport direction T outlet side support 5 in FIG. 4 elastic. For example, the arrangement of a leaf spring element fastened to the carrier 17 is conceivable. As a result, in the region of this support 5, a moveable support of the fiber guiding element 13 is obtained, so that this is at larger thicknesses of the Stapelfaserverbands 3 can continue to rebound.

Finally shows FIG. 4 a possible fixation of the fiber guide element 13 on said carrier 17. Thus, it is possible to realize the fixation next to or alternatively to the shown positive fastening in the region of the holding portion 16 shown with the aid of one or more magnets 18, wherein the or the magnets 18 part the fiber guiding element 13 and / or the carrier 17 may be.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are also possible as any combination of the features described, even if they are shown and described in different parts of the description or the claims or in different embodiments.

LIST OF REFERENCE NUMBERS

1

Roll stretching arrangement

2

Leaf spring element

3

Staple fiber strand

4

axis of rotation

5

In stock

6

inlet side roller arrangement

7

outlet side roller assembly

8th

inlet roller

9

Inlet counter roll

10

outlet roll

11

Discontinued counter roll

12

Endlosriemchen

13

Fiber guide element

14

resilient trained portion of the fiber guiding element

15

leaf spring

16

Holding portion of the fiber guiding element

17

Carrier of the roller draw assembly

18

magnet

19

apron guide

20

Fiber guide section

D

Thickness of fiber guide surface

T

transport direction

Claims (15)

Roller stretching arrangement (1) of a workstation of a staple fiber-processing textile machine, in particular a spinning machine, a roving machine or a knitting machine, for warping at least one strand-shaped staple fiber band (3) entering the roller drawing arrangement (1) in a transport direction (T); - wherein the roller draw assembly (1) has at least one draft zone which is delimited by an inlet-side roller arrangement (6) and an outlet-side (7) roller arrangement, - Wherein the inlet side roller assembly (6) comprises an inlet roller (8) and an inlet counter roll (9) cooperating therewith and the outlet side roller arrangement (7) comprises an outlet roller (10) and an outlet counter roller (11) cooperating therewith - wherein the roll drawing assembly (1) comprises an endless belt (12) which wraps around the infeed roller (8) and a belt guide (19) spaced from the infeed roller (8) in the transporting direction (T), characterized. - That the Endlosriemchen (12) at least one fixedly fixed fiber guide element (13) is associated, which is at least partially elastic, wherein the fiber guide element (13) the staple fiber dressing (3) during operation of the roller draw assembly (1) against a between the inlet roller (8 ) and the Riemchenführung (19) extending portion of the Endlosriemchens (12) presses and this at least partially adapts to the contour of the Endlosriemchens (12). Roller stretching arrangement (1) according to the preceding claim, characterized in that the fiber guiding element (13) is arched at least in sections convexly in the direction of the endless belt (12). Roller stretching arrangement (1) according to the preceding claim, characterized in that the fiber guiding element (13) has, at least in sections, a thickness (D) whose magnitude is between 0.05 mm and 1.0 mm, preferably between 0.05 mm and 0.7 mm, lies. Roller stretching arrangement (1) according to one of the preceding claims, characterized in that in the transport direction (T) the portion of the fiber guiding element (13) which is in contact with the staple fiber structure (3) during operation of the roll drawing arrangement (1) has a spatial extent whose amount is at least 50%, preferably at least 70%, of the distance between the axes of rotation (4) of the inlet roller (8) and the outlet roller (10). Roll stretching assembly (1) according to one of the preceding claims, characterized in that the fiber guide element (13) with a bias voltage to the Endlosriemchen (12) or the between the fiber guide element (13) and the Endlosriemchen (12) guided staple fiber strand (3). Roll stretching assembly (1) according to one of the preceding claims, characterized in that the fiber guide element (13) has a resiliently formed section (14). Roll stretching assembly (1) according to the preceding claim, characterized in that at least the resiliently designed Section (14) of the fiber guide element (13) by a leaf spring (15) is formed. Roller stretching arrangement (1) according to one of the preceding claims, characterized in that the fiber guiding element (13) consists at least partially of metal, ceramic and / or plastic, in particular Teflon, polyamide, and / or polyethylene. Roller stretching arrangement (1) according to one of the preceding claims, characterized in that the fiber guiding element (13) has a friction-reducing coating. Roller stretching arrangement (1) according to one of the preceding claims, characterized in that the fiber guide element (13) comprises a holding portion (16) via which it, preferably releasably, on a support (17) of the roll drawing assembly (1) is attached. Roller stretching arrangement (1) according to the preceding claim, characterized in that the holding portion (16) of the fiber guiding element (13) by means of a magnet (18) and / or by positive engagement, for example by means of a clip connection, on the carrier (17) is attached. Roller stretching arrangement (1) according to one of the preceding claims, characterized in that the fiber guide element (13) via at least two in the transport direction (T) spaced supports (5) is supported, wherein between the two supports (5) extending portion of the fiber guiding element ( 13) is formed in a direction perpendicular to the transport direction (T) extending direction elastically deformable. Roll stretching assembly (1) according to the preceding claim, characterized in that at least one of the supports (5) designed to be elastic and, for example, by a leaf spring element (2) is formed. Roller stretching arrangement (1) according to claim 12 or 13, characterized in that the fiber guide element (13) protrudes in the transport direction (T) a little way beyond the outlet (5) seen in the transport direction (T) and in this case in the vicinity of the outlet counter roll (11 ) ends, so that in the transport direction (T) of said support (5) downstream fiber guide section (20) is present. A staple fiber processing textile machine, in particular in the form of a spinning machine, a roving machine or a knitting machine, characterized in that it comprises at least one roller draw assembly (1) according to one of the preceding claims.

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