EP1664403A1

EP1664403A1 - Drawing frame-roving frame combination for the production of rove by means of a pneumatic spinning process

Info

Publication number: EP1664403A1
Application number: EP04738065A
Authority: EP
Inventors: Herbert Stalder; Christian Griesshammer
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2003-09-12
Filing date: 2004-07-06
Publication date: 2006-06-07
Anticipated expiration: 2024-07-06
Also published as: JP2007505226A; US7647760B2; EP1664403B1; WO2005026420A1; US20070144136A1

Abstract

The invention relates to a drawing frame-roving frame combination (35) in which several slivers (38) are first doubled and drawn, whereupon a rove (9) is produced therefrom, said processes taking place in the same machine. The rove (9) is produced by providing the sliver (3) with a twist, twisting being done with the aid of one or several air flows. For that purpose, the inventive device (35) comprises a drawing frame (36) and one or several twisting means (4) that are located downstream therefrom.

Description

Draw frame / roving machine combination for the production of roving using an air spinning process

The present invention relates to a draw frame spinning machine combination for doubling and stretching several slivers to form a draw frame and for the subsequent production of a roving from the draw frame, as well as a method for producing a roving according to the preamble of independent claim 11.

Such a combined device is unknown in textile technology. The two individual assemblies from which the device according to the invention is made are, however, partially - i.e. not in this form and not with the swirl distribution method according to the invention - common. The stretch as a textile machine for doubling and stretching several slivers into one stretch band is known as such. Roughing machines for the production of so-called rovings from one or more conveyor belts are also known as such, but not with the swirl imparting device according to the invention. The roving machines according to the present invention include, for example, the so-called flyer. The roving serves as a template for the actual spinning process, i. H. for spinning the fibers into a fiber yarn, for example on a ring spinning machine.

According to the state of the art, the slivers coming from the Vorwerk (carding machine) are first duplicated with the help of draw frames and at the same time stretched and then placed in cans. The resulting conveyor belt is then submitted to the roving machines (flyers) for further processing. In these roving machines, the draw frame is usually first drawn further in its own drafting system and then twisted slightly by means of an appropriate twist before the original sliver is wound onto a feed spool as roving. The resulting roving (also known as fiber sliver, flyer sliver or generally sliver) usually serves as a template for ring spinning machines. As mentioned, the roving machine usually has its own drafting system, usually a double apron drafting system. After being warped by the drafting machine of the roving machine, the roving is given a slight twist (so-called protective twist) so that the resulting sliver has a certain strength, does not disintegrate and can be wound on a spool. The rotation granted may only be so high that the cohesion of the roving is firm enough for winding and unwinding as well as the transport of the bobbins, so that, in particular, there is no misalignment (thin spots in the roving). In particular, the twist must be easily dissolvable or the roving must remain draftable so that the subsequent spinning process, e.g. B. can be accomplished in a ring spinning machine.

The so-called flyer, which produces the corresponding flyer fuse, is generally used as the pre-spinning machine. This pre-spinning machine is equipped with a drafting system and a spindle for winding the flyer sliver onto a solenoid by means of a wing to support the sliver against the centrifugal force caused by the spindle speeds. The flyer is an expensive machine in the entire spinning process, especially because of the complicated winding mechanism. In addition, the usual performance of a flyer is 20 - 25 meters of roving per minute. However, this low production cannot be increased with regard to the winding system with flyer wings, since a higher speed is limited by the centrifugal force which the wings and the roving spool have to endure.

It has therefore already been attempted by so-called direct spinning to bypass the prespinning machine by feeding a ring belt directly to the ring spinning machine as a template. The high distortion due to the so-called fiber bandage direct spinning, however, only achieves the result to a limited extent, which is achieved when a flyer slide is presented on the ring spinning machine. This is especially true when fine yarns with Nm 50 and finer are spun. In addition is the presentation of routes can be complex and complicated with the ring spinning machine.

One possibility of replacing the flyer is disclosed in EP 375 242 A2. It shows a machine for producing a roving from a fiber structure, which has a twist distribution means with a rotating rotor. The rotor has a continuous longitudinal bore on its axis of rotation, through which the fiber structure to be twisted is guided. At a certain height, the rotor has a plurality of rotationally symmetrically arranged bores going in the radial direction. These radial bores connect the longitudinal bore through which the fiber structure is guided with the outer surface of the rotor. This outer surface of the rotor is exposed to a vacuum or a strong negative pressure. If the fiber structure is now pulled through the longitudinal hole, individual free fiber ends are drawn from the surface of the fiber structure into these radial holes. In operation, the rotor turns while the fiber structure is pulled through the longitudinal hole. The fiber ends located in the radial bores are thereby wound around the moving core of the fiber structure, whereby the fiber structure or individual fibers thereof are given a rotation (real twist).

The device according to the cited document is relatively complex to manufacture and operate because of the mechanical elements (rotating rotor) and the vacuum technology.

For the production of yarns, it is known, for example from DE 32 37 989 C2, to warp a fiber sliver or a fiber structure in a drafting device and then to impart a twist to the warped fiber structure, the swirl being provided by air jets in two successive swirl chambers. The swirl in the first pneumatic swirl chamber takes place in the opposite direction to the subsequent swirl in the second pneumatic swirl chamber (the first swirl causes, for example, a left turn, while the subsequent one Swirl in the second swirl chamber causes a clockwise rotation). In this way, a yarn is produced according to the so-called false wire spinning process).

According to the patent specification CH 617465, a false wire nozzle is used to produce a staple fiber yarn (also a false wire spinning process).

When creating a yarn - in a spinning process - the individual fibers are spun or twisted to such an extent that the twisting is virtually irreversible and the yarn produced can no longer be warped. This hardening, created by the twisting, is also necessary for the yarn, because this is the only way to obtain the high tensile strength required. However, this means that the devices and spinning processes mentioned are not suitable for forming a roving. The roving has only one so-called protective twist, which must not hinder the further spinning process on the following machines (e.g. warping on the ring spinning machine), i. H. the roving must remain draftable. The devices shown in these two documents are therefore only suitable for the production of yarns and not of warpable roving.

The object of the present invention is to provide a roving machine and a method for producing a roving in which a process is shortened and the disadvantages of conventional roving machines mentioned above can be avoided. In particular, a roving is to be produced which has the properties of conventional flyers or rovings, this concerns in particular the warpability of the roving produced.

This object is solved by the features in independent claims 1, 2 and 11. By combining a draw frame with a pre-spinning machine with a swirl imparting means according to the invention, it is possible to eliminate the disadvantages of the prior art, ie in particular that the process is shortened and that a pre-spinning machine is created which allows a higher production output. Advantageous refinements and embodiments of the invention can be found in the dependent claims.

The invention, its inventive concept, and the mode of operation of the invention are explained below on the basis of exemplary embodiments illustrated in the figures. However, it should be expressly pointed out that the invention or the inventive concept is not limited to the embodiments shown in the examples.

FIG. 1 shows a draw frame / spinning machine combination 35 according to the invention. This machine can be schematically divided into two areas I and II. The first area I contains the route 36 with a drafting unit 37. The drafting unit 37 is preferably regulated. The slivers 38, which are removed from several cans 39, are duplicated in front of the draw frame 36 and stretched in the drafting unit 37. The resulting route belt 3 is then fed directly to area II of the route / roving machine combination according to the invention. In region II or at the spinning positions 1, a roving 9 is produced from the draw frame 3. For this purpose, the conveyor belt 3 passes through a swirl distribution means 4 and preferably one before

Twist distribution means 4 arranged drafting unit 2. The roving 9 is then wound up via a winding device 7.

The mode of operation of the swirl imparting means 4 is described in the following figures.

FIG. 1 a shows schematically a possible spinning station 1 (ie twist distribution point) of a draw frame / spinning machine combination (entire machine not shown) according to the invention. The figure shows only one of several possible embodiments for the swirl distribution means 4. The draw frame / spinning machine combination according to the invention can also be equipped with swirl distribution means which operate according to a different air spinning method. The embodiment of the spinning station 1 shown has a (also shown schematically) Drafting unit 2, which is supplied with a conveyor belt 3 (e.g. a doubled conveyor belt). The (stretched) stretch belt 3 then passes from the drafting unit 2 into the twist distribution means 4. In the twist distribution means 4, the stretch band 3 is twisted to a roving 9, ie at least partially a real twist is given to the stretch band (ie at least part of the fibers of the stretch band). In addition, FIG. 1 a shows a pair of draw-off rollers 8 with a clamping line 34 and a winding device 7 (also shown schematically) for the roving 9. The device according to the invention does not necessarily have to have a drafting device 2 or a pair of draw-off rollers 8, as is shown in FIG.

The swirl imparting means 4 shown in FIG. 1a works according to the so-called vortex process, a special air spinning process. The vortex air spinning process is known per se as a yarn spinning process. As already mentioned above, devices for yarn formation per se are unsuitable for the production of a warpable roving. Surprisingly and unexpectedly, tests with suitably modified air spinning devices have shown that certain air spinning processes are also suitable for the production of rovings. For this, however, the dimensions and the flow conditions of conventional yarn-air spinning devices have to be adapted. The twist distribution means according to the invention only have to give the conveyor belt a protective turn so that the sliver or roving formed thereby remains draftable. Conventional conventional air spinning devices rotate the conveyor belt in such a way that a yarn or a thread is formed which is twisted to such an extent that the rotation is irreversible and, in particular, is no longer deformable. By a correspondingly larger dimensioning of the air spinning devices, as well as an adaptation of the

Flow conditions and, above all, through suitably high delivery speeds, can also be used to produce warpable rovings or slips with air spinning devices. The most suitable conditions can best be determined experimentally. According to initial tests, air spinning devices for rovings preferably have one or more of the following properties: the diameter of the swirl or swirl chamber is preferably at least 5 mm (see swirl chamber 5 in the figures described below), preferably the delivery speed of the conveyor belt (from the outlet rollers of the drafting system) is at least 200 m / min, preferably the pressure of the air flow before it passes through the

Nozzle holes or nozzles flowing into the swirl chamber, at most 5 bar (see air flow 32, 16, 16.1, 16.2, or 20, and nozzle holes or nozzles 11 in the figures described below), preferably these air spinning devices impart a deep to the roving or the sliver Winding rotation, preferably the winding rotation or the rotation coefficient is less than 70.

The mode of operation of the device for forming a roving according to the invention is similar to the mode of operation of conventional air spinning processes for yarn formation. For this reason, the air spinning processes used for the device according to the invention are not dealt with in great detail here. In contrast to conventional air spinning devices, only a protective twist is given to the drawstring or roving in the devices and methods according to the invention. This protective twist is such that the roving remains draftable for the further processing. To form the roving, the drawstring is at least partially given a real twist, i.e. H. at least some, if not all, of the fibers of the conveyor belt are given a real twist (rotation) by means of an air flow. As already mentioned, this real twist or this rotation is only a protective rotation. The roving or sliver produced according to the invention therefore has the same properties as a sliver produced with a conventional flyer.

The statements just made naturally apply to all swirl imparting means according to the invention of this document, which are shown and explained below with the aid of further figures. These statements therefore apply not only to the swirl imparting means 4 in FIG. 1a, but also to those twist imparting means with the reference numerals 15, 17, 18 and 31. One of the possible twist-imparting means according to the invention for the formation of roving is the already mentioned object 4 from FIG. 1a, which, as already mentioned, works according to the so-called vortex air spinning process. For this purpose, the device 4 has a fiber guiding element 10 with which the conveyor belt 3 is delivered into the swirl chamber 5 of the swirl distribution means 4. In the vortex chamber 5, a fluid device (not shown in more detail) generates an air flow 32 or a vortex flow by means of one or more nozzle bores 11. The resulting vortex flow within the vortex chamber 5 causes individual free fiber ends 12 on the surface of the conveyor belt 3 around the inlet opening 13 of the roving formation element 6 and - captured by the rotating vortex flow in the vortex chamber - rotate around the core 14 of the conveyor belt. As a result, the conveyor belt 3 in the swirl chamber 5 is at least partially given a real swirl by means of an air flow 32. This means that at least a part of the route belt, ie individual fibers, is given a real twist or a real rotation around a core of largely parallel permanent fibers. The roving 9 thus created at the inlet mouth 13 is drawn off, for example, via a pair of draw-off rollers 8 and wound onto a winding device 7. For this purpose, the roving element 6 has a bore (see FIG. 1a). The winding device 7 in FIG. 1a is only shown schematically. For example, the winder can be a cross winder, a precision cross winder, a wild cross winder, a step precision winder or a parallel winder.

FIG. 2 shows the swirl distribution means 4 from FIG. 1a in another view. It can be seen particularly well in this figure how the drawstring 3 is guided through the fiber guide element 10 into the swirl chamber 5, where a swirling air flow generated by the nozzle bores 11 detects the free fiber ends 12 of the drawstring 3 and places it around the inlet mouth 13 of the roving formation element 6. The free fiber ends 12 lying around the inlet mouth 13 form a "sun" rotating around the core 14 of the route belt. The free fiber ends 12 thus twist around the core 14 of the route belt, whereby the conveyor belt 3 in the swirl chamber 5 at least partially receives a real twist (rotation) due to the air flow. The roving 9 thus created at the inlet mouth 13 is pulled through the roving formation element 6 (e.g. a spindle as shown here) (see arrow).

FIG. 3 shows a further twist distribution means 15 according to the invention. This works according to the so-called single-nozzle false-wire method and has no roving element. The swirl distribution means 15 (shown schematically) likewise has only one swirl chamber 5, in which an air flow 16 (swirl flow) is generated by means of one or more nozzle bores 11. By means of this air flow 16, the conveyor belt is at least partially given a real spin in the swirl chamber 5.

The real twist distribution (true rotation in the conveyor belt) is shown in FIG. 3a: inside the swirl chamber 5, the conveyor belt 3 is given a rotation by the air flow 16, i. H. at least some of the fibers of the conveyor belt 3 are twisted so that the fuse 9 is formed.

FIG. 3b shows a variant of the swirl distribution means according to FIG. 3a. The swirl distribution means 17 has two swirl chambers 5, each of which is not

Have roving element. The real twist is also given here by means of one or in this case two air flows 16.1 and 16.2. At least some of the fibers of the conveyor belt 3 receive a real twist (rotation). Here too, the roving 9 or the sliver is drawn off and wound up by a device (not shown). The swirl distribution means 17 preferably has a plurality of nozzle bores 11. The nozzle bores 11 serve to generate the air flows 16.1 and 16.2. The nozzle bores are aligned in such a way that the emerging air jets together and together produce the air flow 16.1 or 16.2. For this purpose, the entry angles of the nozzle bores 11 within the respective swirl chamber 5 are preferably the same. The air flows 16.1 and 16.2 are also rectified, ie the two air flows 16.1 and 16.2 despite separate vortex chambers - have the same direction of rotation (right or left rotating air flow).

FIG. 3c shows a variant of the swirl distribution means according to FIG. 3b. The swirl imparting means 40 differs from the preceding device in that the air flows 41 and 42 in the swirl chambers 5.1 and 5.2 are not directed in the opposite direction but in the opposite direction (i.e. one air flow 41 is clockwise - the other 42 is counter-clockwise). As a result, the conveyor belt 3 is given a twist according to the so-called false-wire method.

In all embodiments of the invention, the individual nozzles or nozzle bores are preferably arranged rotationally symmetrically to one another.

The swirl distribution means according to the invention preferably also have one or more swirl stowage elements. Swirl jam elements can have different shapes. A swirl congestion element can be designed, for example, as an edge, as a pin, as a twisted surface, as a cone or in the form of several steering means.

FIG. 4 shows a swirl imparting means 18 with a swirl accumulation element in the form of a pin 19. The remaining elements of FIG. 4 largely correspond to the embodiments already described and accordingly also have the same reference numerals. Pin 19 in FIG. 4 serves both as a twist accumulation element and as a false yarn core. Swirl jam elements are used to prevent rotation in the conveyor belt from propagating further back. In particular, this prevents any wrong rotation from occurring and thus at most no real twist is given to the conveyor belt. The use of swirl congestion elements for the devices and methods according to the invention is not absolutely necessary, but is recommended. In particular, this improves the real twist distribution by means of the air flow. A swirl jam element is not absolutely necessary, in particular, in those devices according to the invention in which the swirl is imparted using a false wire method. As shown in FIGS. 4a and 4b, a pin 19 prevents the rotation generated by the air flow from propagating further back towards the entrance of the fiber guiding element in the conveyor belt 3. This can be seen particularly well in FIGS. 4a, 4b and 4c: the air flow 20 around the mouth of the roving formation element (not shown) produces a twist or a twist within the stretch band 3. The presence of the pin 19 as a twist jam element prevents it that the rotation of the fibers is transferred to the conveyor belt 3, which lies on the fiber guide element 10 or 21 (see parallel untwisted fibers on the fiber guide elements 10 or 21 in the figures).

A twisted fiber guiding surface 21 can also serve as a swirl jam element. FIG. 4b shows a twisted fiber guide surface 21, which additionally has a pin 19. This makes the swirl function particularly effective. A twisted fiber guide surface 21 with a pin is also shown in FIG. 4c. The elements of FIG. 4c largely correspond to the elements of FIG. 4b with the difference that pin 19 of FIG. 4c is blunt.

FIG. 5 shows a fiber guide element 10 with a so-called twist-stop cone 24. The twist-stop cone 24 performs the function of the twist-stopping element. The mode of action is the same as for the pin: cone or pin also serve as so-called false yarn cores. The fibers or the drawstring lie in a spiral around the wrong yarn core, which prevents the rotation from propagating against the direction of withdrawal of the roving or drawstring.

Only a twisted fiber guide element 22 without a pin can also serve as a swirling element. This is shown, for example, in FIG. 6 (compare with FIG. 4c). A twisted fiber guiding surface is in itself sufficient as a swirl stowage element. The additional use of a pin is not absolutely necessary. Different views of a tortured fiber guide element without pin 22 are given in FIGS. 6a and 6b. Only one edge 33, which is not essential, can also serve as a swirl jam element must be preceded by a twisted fiber guide surface, so that a flat fiber guide surface can also suffice.

FIG. 7 shows further swirl congestion elements which could be used in the device according to the invention. The figure shows a fiber guide element 23 with several steering means. In addition to their function of steering the route belt 3, these steering means 26 also have the effect of a swirl stop. The figure clearly shows how the steering means 26 with a twist accumulation function work: the stretch belt 3 is pulled in the untwisted state in the direction of the roving formation element 6. At the mouth of the roving element 6, the free fiber ends 12 are twisted by the air flow 20 of the swirl chamber by real twist. The twisting of the free fiber ends 12 creates a torsional moment which tries to propagate against the draw-off direction (arrow) of the roving in the draw frame 3. Due to the presence of the steering means 26 with swirl function, this torsional moment or the rotation, which the

Would cause torsional moment in the conveyor belt, jammed or stopped. This means that no rotation propagates in the route band 3 (see illustration in FIG. 7: The route band 3 is not twisted). In this way, the stretch belt 3 is given a real twist (rotation) by means of the air flow 20, whereby the roving 9 is created.

Without the steering means 26 with a swirl jam function, the rotation would propagate into the stretch band 3, which would result in a so-called false rotation, which under certain circumstances prevents the stretch band or roving from rotating properly. A further illustration of the conditions just explained can be seen in FIG. 7a: Here, too, it is very easy to see how the route belt 3 remains undistorted thanks to the steering means 26.

FIGS. 8a and 8b show steering means with a swirl-stopping function of different shapes. FIG. 8c shows a view of the steering means 27 or 28 in the pull-off direction of the roving or the stretch belt. They are different

Shapes for the steering means with swirl function possible. The steering means 26, 27 and 28 shown represent only some of the possible forms. The roving machine according to the invention can preferably also have means which determine the width of the drawstring before it enters the twisting means. These means can be, for example, funnels or other forms of condensers. Such a means 29 is shown in FIG. 9: The figure shows a funnel 29, which restricts a conveyor belt 3 in its width and feeds it to a swirl-imparting means 31. Such a funnel 29 or other condenser can, for example, be arranged downstream of a pair of outlet rollers 30. The outlet roller pair 30 is shown in a top view. The reference numeral 34 indicates the clamping line of the outlet roller pair 30.

As described in the exemplary embodiments further above, the draw frame / spinning machine combination according to the invention for producing a roving from a draw frame has a special twist distribution means. The special twist distribution means of the device according to the invention twists a fiber sliver into a roving. For this purpose, the swirl distribution means according to the invention has a swirl chamber with a roving element contained therein. The roving element is preferably a spindle. In the swirl chamber of the swirl imparting means, according to the invention, a real swirl (rotation) is given to the conveyor belt at least partially (i.e. at least part of the fibers) by means of an air flow.

The roving machine according to the invention for producing a roving from a draw frame can also have a different design of a twist-imparting means: A further twist-imparting means, also according to the invention, has a swirl chamber without a roving formation element (e.g. spindle). However, this vortex chamber has means which allow an air flow to arise in the vortex chamber. This air flow gives the conveyor belt a real twist (rotation) at least in part (ie at least part of the fibers). This further embodiment of a swirl distribution means according to the invention can also have a plurality of swirl chambers with a corresponding number of means for forming an air flow (see, for example, FIG. 3b or 3c). In addition to the draw frame, the drafting machines according to the invention or the swirl distribution means according to the invention can also be preceded by a drafting device.

The swirl imparting means according to the invention preferably each have one or more swirl dam elements. These swirl congestion elements can be designed, for example, as an edge, as a pin, as a twisted surface, as a cone or as a plurality of steering means. The swirl imparting agents according to the invention can also have a combination of the swirl jam elements just mentioned, e.g. a twisted surface with a pin, or a cone with a pin, or an edge with a pin, or a twisted surface with a pin. The swirl imparting means according to the invention can have several of these swirl congestion elements or a combination thereof.

The swirl distribution means according to the invention preferably have a plurality of nozzles for generating the air flow, the nozzles being oriented such that their emerging air jets are directed in the same direction in order to jointly produce a rectified air flow within the same swirl chamber. This does not necessarily apply if there are several vortex chambers. If there are several vortex chambers, the air currents can be opposite

Have directions of rotation. The nozzle bores are preferably arranged rotationally symmetrically about the axis of the swirl chamber within a swirl chamber (the entry angles of the nozzle bores are therefore the same). If there are several vortex chambers, the nozzles can preferably be arranged such that the nozzles of a respective vortex chamber are arranged rotationally symmetrically, but each vortex chamber has a different entry angle for the respective nozzles. The air jets emerging in the respective swirl chambers can therefore not only have different directions of rotation - in the sense of a left or a right turn - but also have different “pitch angles”. A rotationally symmetrical arrangement of the nozzles is shown, for example, in FIG. 2. A rotationally symmetrically offset arrangement the nozzle is closed in FIG. 3b see (the nozzle bores 11 of the two vortex chambers are also arranged rotationally symmetrically as in FIG. 2).

The roving machines and twisting means according to the invention preferably have a means, in particular a funnel or an aerodynamic or mechanical condenser, which has the function of determining the width of the conveyor belt before it enters the twisting means.

The distance between the inlet opening of the roving element (e.g. spindle) and the last clamping line (e.g. the pair of outlet rollers) is preferably not greater than the longest fiber length contained in the drawstring or greater than the average staple fiber length of the drawstring.

The distance between the entrance of the swirl-imparting means and the last clamping line (e.g. the pair of outlet rollers of a drafting system) is preferably not greater than the longest fiber length contained in the conveyor belt.

A winding device is preferably assigned to the roving machine according to the invention. This winds up the roving emerging on the swirl imparting agent. The winding device is preferably a cross winder, a precision cross winder, a wild cross winder, a step precision winder or a parallel winder.

The yarn-forming element is preferably a spindle.

The invention also includes a method according to the invention for producing a roving from a draw frame. In this method according to the invention, a stretch belt is produced from a plurality of fiber strips by doubling and stretching, the stretch strip preferably subsequently stretching again and then at least partially (ie at least part of the fibers of the conveyor belt) is subjected to a twist (rotation). For this method according to the invention there are preferably a plurality of nozzles for generating the air flow. For this purpose, the nozzles are preferably arranged rotationally symmetrically about an axis or rotationally symmetrically offset about an axis (see explanations above and FIGS. 2 and 3b, 3c).

In the roving machine according to the invention, in particular flyer, discussed above, when using a swirl-imparting agent according to the invention or in the method according to the invention for producing a roving, the roving is only given a protective turn. I.e. the roving created by the air flow is draftable.

The invention is not restricted to the possibilities and embodiments explicitly mentioned. Rather, these variants are intended as suggestions for the person skilled in the art in order to implement the idea of the invention as cheaply as possible. Further advantageous applications and combinations can therefore easily be derived from the embodiments described and shown in the figures, which also reflect the inventive idea and are intended to be protected by this application. Some of the disclosed features of the invention have been described in combination in this specification and are claimed in combination in the following claims. However, it is also conceivable to claim individual features of the invention of this description, alone or in another combination, using the inventive concept. The applicant therefore expressly reserves the right to provide other combinations in application of the inventive concept. Legend:

1 spinning station of a roving machine

2 drafting system

3 track belt

4 swirl imparting agents

5, 5.1, 5.2 vortex chamber

6 roving element (spindle)

7 winding device

8 pair of take-off rollers

9 roving

10 fiber guide element

11 nozzle bores or nozzles

12 free fiber ends

13 inlet mouth

14 core

15 swirl imparting agents without roving elements

16, 16.1, 16.2: air flow

17 swirl distribution means with two swirl chambers

18 Swirl distribution means with swirl jam element

19 pin

20 air flow

21 twisted fiber guide element with pin

22 twisted fiber guide element without pin

23 fiber guiding element with several steering means

24 swirl stop cones

25 fiber guide element

26, 27, 28 steering device with swirl stop function

29 funnels

30 pair of outlet rollers

31 swirl imparting means

32 air flow Edge of the clamping line of the stretching and roving machine combination of the stretching unit, the fiber structure, the twist distribution means, the right-hand air flow, the left-hand air flow

Claims

claims

1. Draw frame spinning machine combination (35) for doubling and drawing several slivers (38) to form a draw strip (3) and for the subsequent production of a roving (9) from the draw strip (3), containing one or more, preferably regulated, draw frames (36), as well as one or more spinning stations (1), each with a swirl-distributing means (4) and preferably a drafting device (2) arranged in front of the swirl-distributing means (4), characterized in that the swirl-distributing means (4) has a swirl chamber (5 ) with a roving formation element (6) contained therein, the stretch belt (3) in the swirl chamber (5) being given a real twist or at least partially a real twist by means of an air flow (32).

2. Draw-pre-spinning machine combination (35) for doubling and stretching several slivers (38) to form a draw frame (3) and for the subsequent production of a roving (9) from the draw frame (3), containing one or more, preferably regulated, draw frames (36), as well as one or more spinning stations (1) arranged downstream thereof, each with a swirl imparting means (4) and preferably a drafting device (2) arranged in front of the swirl imparting means (4), characterized in that the swirl imparting means (15, 17) has one or more Has vortex chambers (5, 5.1, 5.2) without a roving element, the stretch belt (3) in the vortex chamber (s) (5, 5.1, 5.2) having a real twist or at least partially a real twist by means of one or more air flows (16, 16.1, 16.2, 41 , 42), preferably by a false wire method.

3. Draw frame spinning machine combination for producing a roving (9) according to claim 1 or 2, characterized in that the twist distribution means (4,18) at least one twist accumulation element (19,21, 22,26,27,28,33 ), the swirl element is preferred as an edge (33), as a pin (19), as a twisted surface (21, 22), as a cone (24), as a plurality of steering means (26, 27, 28), or as a combination of these elements.

4. Draw frame spinning machine combination for producing a roving (9) according to claim 1, 2 or 3, characterized in that the swirl distribution means (4, 17, 18) a plurality of nozzles (11) for generating the air flow (16, 16.1, 16.2, 20), the nozzles (11) being aligned such that the emerging air jets (32) are aligned in such a way that together they produce a rectified air flow (16.1, 16.2, 20) and swirl, the nozzles (11) are preferred arranged rotationally symmetrically or rotationally symmetrically offset.

5. Draw frame spinning machine combination for producing a roving (9) according to claim 2 or 3, characterized in that the swirl distribution means (4, 17, 18) has a first swirl chamber (5.1) and then at least one further swirl chamber (5.2) Each swirl chamber (5.1, 5.2) for swirling contains nozzles (11) for generating an air flow (16, 16.1, 16.2, 20), the nozzles (11) having at least one swirl chamber (5.2.) following the first swirl chamber (5.1) ) are aligned in such a way that they produce an air flow (42) which rotates in the opposite direction to the rotating air flow (41) of the first swirl chamber (5.1) and thus a swirl arrangement which is opposite to the swirl arrangement of the first swirl chamber (5.1).

6. Draw frame spinning machine combination for producing a roving (9) according to one of claims 1 to 5, characterized in that means (29), in particular funnels (29) or aerodynamic or mechanical condensers are provided, which are the width of the draw frame (3) determine before entering swirl imparting agent (4,15,17,18,31).

Draw frame spinning machine combination for producing a roving according to one of claims 1 or 3 to 6, characterized in that the distance between the inlet opening of the roving element (13) and the last clamping line (34) is not greater than the longest fiber length contained in the drawstring (3).

8. Draw frame spinning machine combination for producing a roving according to claim 2, 4 or 6, characterized in that the distance between the entrance of the twist distribution means (4, 15, 17, 18, 31) and the last clamping line (34) is not is greater than the longest fiber length contained in the stretch belt (3).

9. Draw frame / spinning machine combination according to one of the preceding claims, characterized in that the spinning unit (s) (1) of the prespinning machine is associated with a winding device (7) which detaches the material from the twist distribution means (4, 15, 17, 18, 31). emerging roving (9) winds up, preferably the winding device (7) is a cross winder, a precision cross winder, a wild cross winder, a step precision winder, or a parallel winder.

10. Draw frame spinning machine combination according to one of the preceding claims, characterized in that the yarn forming element (6) is a spindle.

11. A method for producing a roving (9) from slivers (38), in which a sliver (3) is produced from a plurality of slivers (38) by doubling and stretching, the stretching belt (3) preferably being stretched again afterwards and then At least partially undergoes a swirling, characterized in that the swirling takes place by means of one or more air flows (16, 16.1, 16.2, 20, 41, 42) in one or more swirl chambers (5, 5.1, 5.2).

12. A method for producing a roving (9) from fiber ribbons (38) according to claim 11, characterized in that a plurality of nozzles (11) for generating the air flow (16, 16.1, 16.2, 20) are present, the nozzles (11) so are arranged in such a way that the emerging air jets (32) are rectified in order to generate a rectified air flow (16, 16.1, 16.2, 20) together.

13. Draw frame spinning machine combination or method for producing a roving from fiber ribbons (38) according to one of the preceding claims, characterized in that the twist given to the roving (9) is a protective twist, as a result of which the roving (9) remains retractable.

14. Draw frame spinning machine combination or method for producing a roving (9) from fiber strips (38) according to one of the preceding claims, characterized in that the production of the roving (9) does not take place according to a false wire method.