MULTIFUNCTIONAL NOZZLE FOR A SPINNING MACHINE

Abstract

TA multifunctional nozzle for a spinning machine used to produce at least real-twist yarn. The multifunctional nozzle comprises a nozzle channel open on one side in a nozzle housing and in which a vortex flow can be generated. A nozzle body which is shorter than the nozzle channel is provided with a through-channel for the passage of a thread or fibre band. An annular gap with a narrow point is formed within the nozzle channel. The annular gap tapering on both sides at the narrow point. The narrow point is arranged downstream of a fluid inlet which leads to the nozzle channel. A hollow body-type flow conducting body is provided between the annular gap and the open end of the nozzle channel for guiding the thread or fibre band together with a fluid, the annular gap being formed between the nozzle body and the nozzle housing and/or the flow conducting body.

Claims

1. A multifunctional nozzle for a spinning machine, comprising; a pressurisable nozzle housing with a nozzle channel which extends along a longitudinal axis direction of the pressurisable nozzle housing and is open on one side along the longitudinal axis direction; a fluid inlet for admitting a pressurised fluid into the nozzle channel to bring about a vortex flow within the nozzle channel; a nozzle body designed to be arranged in the nozzle channel or to be formed in the nozzle channel together with the pressurisable nozzle housing, wherein the nozzle body is shorter than the nozzle channel along the longitudinal axis direction and has a through-duct which extends along the longitudinal axis direction for guiding through a thread or a fibre band; an annular gap which extends in the nozzle channel along the longitudinal axis direction and has at least one narrow point towards which the annular gap tapers on both sides along the longitudinal axis direction, wherein the at least one narrow point is formed downstream of the fluid inlet along the longitudinal axis direction; a delimiting part designed to be formed or arranged in the nozzle channel in a manner closing the pressurisable nozzle housing on a side of the fluid inlet that faces away from the at least one narrow point, wherein the delimiting part has a further through-duct extending along the longitudinal axis direction for the thread or the fibre band for communicating with the through-duct of the nozzle body; and a hollow-body-like flow conducting body designed to guide the thread or the fibre band in a manner accompanied by fluid between the annular gap and an open end of the nozzle channel; wherein the annular gap is formed between the nozzle body and the pressurisable nozzle housing and/or the hollow-body-like flow conducting body.

2. The multifunctional nozzle according to claim 1, wherein the fluid inlet has at least two circumferentially distributed fluid inlet mouths which lead into the nozzle channel.

3. The multifunctional nozzle according to claim 1, wherein the delimiting part is formed by the nozzle body or bears the nozzle body.

4. The multifunctional nozzle according to claim 1, wherein the annular gap has a cross-sectional shape similar to a Laval nozzle along the longitudinal axis direction and/or the flow conducting body has a cross-sectional shape similar to a Laval nozzle along the longitudinal axis direction.

5. The multifunctional nozzle according to claim 1, wherein the nozzle body has a cross-sectional shape similar to a candle flame in a sectional plane running through a central longitudinal axis of the through-duct.

6. The multifunctional nozzle according to claim 1, wherein the flow conducting body is formed by a component that is separate from the pressurisable nozzle housing, said component having a fixed end which is coupled to the pressurisable nozzle housing at a spacing from the delimiting part and a free end which is formed on a side of the flow conducting body that faces away from the delimiting part.

7. The multifunctional nozzle according to claim 2, further including a fibre feed for feeding separated fibres, the fibre feed having a fibre inlet and a fibre duct which communicates therewith and is arranged downstream in a fibre transport direction, and a spinning chamber arranged downstream of the flow conducting body along the longitudinal axis direction, the flow conducting body and the fibre duct opening into the spinning chamber along the longitudinal axis direction, and the spinning chamber having a fibre outlet for discharging superfluous fibres, said fibre outlet being separate from the at least two circumferentially distributed fluid inlet mouths of the flow conducting body and of the fibre duct and being able to be coupled to a vacuum source.

8. The multifunctional nozzle according to claim 7, wherein the spinning chamber is formed by a spinning-chamber housing that is interchangeably coupled or able to be coupled to the pressurisable nozzle housing.

9. The multifunctional nozzle according to claim 8, wherein the pressurisable nozzle housing has a wall which delimits the fibre duct radially on an outside, protrudes beyond the flow conducting body towards the spinning chamber and comprises a coupling member for interchangeably coupling the spinning-chamber housing to the nozzle housing.

10. The multifunctional nozzle according to claim 7, wherein the spinning chamber has a cross-sectional shape similar to a Laval nozzle along a longitudinal axis thereof.

11. The multifunctional nozzle according to claim 7, wherein the spinning chamber along a longitudinal axis thereof has a cross-sectional shape similar to a rotor cup interior having an internal diameter along which the at least two circumferentially distributed fluid inlet mouths of the flow conducting body, of the fibre duct and of the fibre outlet are arranged for communicating with the spinning chamber.

12. An open-end spinning device for spinning a real-twist thread, comprising: a spinning device for spinning the real-twist thread out of fed-in separated fibres; wherein the spinning device comprises the multifunctional nozzle according to claim 7.

13. An open-end spinning method for producing a real-twist thread, comprising: providing the multifunctional nozzle according to claim 8 as a spinning device; admitting a pressurised fluid into the annular gap of the multifunctional nozzle through the fluid inlet in order to generate a vortex flow; applying a vacuum to the fibre outlet of the spinning-chamber housing; introducing a thread end of a thread, via the through-ducts of the delimiting part and of the nozzle body, as far as into the spinning chamber of the multifunctional nozzle; admitting separated fibres into the multifunctional nozzle through the fibre inlet and the fibre duct; and when a vacuum and a positive pressure are applied during the feed of the separated fibres, drawing the thread out of the multifunctional nozzle in an opposite direction to an insertion direction of the thread end by a thread take-up device at a defined take-off speed.

14. A workstation of a spinning machine for spinning a real-twist thread, the workstation comprising: a drafting system device for defined drawing of a fibre band fed to the drafting system device; a spinning device for producing the real-twist thread from the drawn fibre band fed by the drafting system device; a drivable spindle for bearing an empty tube in a manner rotatably entrained therewith, the drivable spindle along with the empty tube being rotatably borne by a spindle rail which is designed to execute a linear stroke movement back and forth along an axis of rotation of the drivable spindle or the empty tube while entraining the drivable spindle together with the empty tube; and a delimiting sleeve having a cavity in which the empty tube borne by the drivable spindle is at least partly received in an upward end position of the linear stroke movement; wherein the spinning device is formed by the multifunctional nozzle according to claim 1, the multifunctional nozzle being arranged between the drafting system device and the delimiting sleeve in a fibre band transport direction so as to transfer the produced real-twist thread into the cavity for winding a winding region of the empty tube during the linear stroke movement performed relative to the delimiting sleeve.

15. A drafting system device comprising: at least two roller pairs for defined drawing of a fibre band fed to the drafting system device, the at least two roller pairs being drivable at different rotational speeds from one another; and the multifunctional nozzle according to claim 1, the multifunctional nozzle being arranged in a fibre band travel path upstream, in a fibre band transport direction, of one of the at least two roller pairs.

16. The multifunctional nozzle according to claim 2, wherein the at least two circumferentially distributed fluid inlet mouths are arranged in an orthogonal plane with respect to the longitudinal axis direction and admit the pressurised fluid tangentially to the annular gap.

17. The multifunctional nozzle according to claim 6, wherein the flow conducting body is arranged coaxially with the pressurisable nozzle housing.

18. The multifunctional nozzle according to claim 6, wherein the free end has a smaller outer diameter than an outer diameter of the at least one narrow point.

Description

IN THE DRAWINGS

[0041] FIG. 1 is a schematic sectional view of a multifunctional nozzle according to a first embodiment example,

[0042] FIG. 2 is a schematic sectional view of a multifunctional nozzle according to a second embodiment example,

[0043] FIG. 3 is a schematic sectional view of the multifunctional nozzle according to one of the embodiment examples shown in FIG. 1 and FIG. 2 along section line A-A,

[0044] FIG. 4 is a schematic sectional view of an open-end spinning device comprising a multifunctional nozzle according to a third embodiment example,

[0045] FIG. 5 is a schematic sectional view of a spinning chamber according to an embodiment example for an open-end spinning device comprising a multifunctional nozzle according to a third embodiment example,

[0046] FIG. 6 is a schematic sectional view of a spinning device comprising a multifunctional nozzle shown in FIG. 2, and

[0047] FIG. 7 is a schematic sectional view of a drafting system device comprising a multifunctional nozzle shown in FIG. 1.

[0048] In the following description of embodiment examples, the same or similar reference signs are used for the elements shown in the various figures that have a similar action, in which case the descriptions of these elements are not repeated.

[0049] FIG. 1 is a schematic sectional view of a multifunctional nozzle 100 according to a first embodiment example. The multifunctional nozzle 100 comprises a nozzle housing 2 to which pressure can be applied and which comprises a nozzle channel 2A, which extends along the longitudinal axis direction A of the nozzle housing 2 and is open on one side along the longitudinal axis direction A. The nozzle housing 2 is a geometric hollow body, the cavity in which forms the nozzle channel 2A. According to this embodiment example, the nozzle housing 2 is made of a plastics-containing material and has a circular cross section orthogonally to its longitudinal axis direction A. The wall 2B of the nozzle housing 2 has a thickness and material composition that allow it to withstand a relatively long application of pressure by compressed air.

[0050] The nozzle housing 2 is formed having a compressed-air inlet 13 in the form of a fluid inlet for generating a vortex air flow in the nozzle channel 2A, the compressed-air inlet 13 extending in the nozzle channel 2A via the wall 2B having a fluid inlet mouth. The compressed-air inlet 13 is arranged inside a compressed-air chamber 17 of an antechamber housing 14 for the compressed-air feed. The antechamber housing 14 is arranged on the nozzle housing 2 and can be coupled to a compressed air source by means of a further compressed-air inlet 3. As shown in particular by FIG. 3 according to a preferred embodiment example, the antechamber housing 14 having the compressed-air chamber 17 extends annularly entirely around the nozzle housing 2 in order to be able to supply compressed air simultaneously to a plurality of compressed-air inlets 13 by means of the compressed-air chamber 17, which is likewise annular. Overall, according to this embodiment example, four compressed-air inlets 13 are formed on the nozzle housing 2 and are arranged in an evenly distributed manner circumferentially. Each of the four compressed-air inlets 13 has fluid inlet mouths, which are arranged, by their mouth axis C, in an orthogonal plane (FIG. 3, section line A-A) in relation to the longitudinal axis direction A in such a way that the compressed air can be admitted tangentially to the nozzle channel 2A. The tangentially oriented mouth axis C furthermore points in a direction facing the open end of the nozzle channel 2A while forming an angle of more than 0 and less than 90 with the orthogonal plane, thereby making it possible to generate an improved vortex air flow having reduced turbulence flows.

[0051] In the nozzle channel 2A, a nozzle body 1 is interchangeably inserted and has a through-duct 15, which extends along the longitudinal axis direction A, for guiding through a thread F or fibre band FB. The cross section of the through-duct 15 is suitably adapted, depending on the cross section of the thread F or fibre band FB being guided therethrough, to be able to guide the thread F or fibre band FB through the nozzle body 1. According to this embodiment example, the internal diameter of the through-duct 15 is adapted, in cross section, to the outer diameter of the thread F or fibre band FB being guided therethrough by being at least 3% and at most 25% larger in order to be able to ensure efficient and in particular unimpeded guidance of the thread F or fibre band FB.

[0052] The nozzle body 1 is shorter than the nozzle channel 2A along the longitudinal axis direction A, in which case the admitted compressed air can be guided in the nozzle housing 2 past a free end of the nozzle body 1 in order to be able to generate a suction flow in the through-duct 15.

[0053] At one end, the nozzle body 1 has a delimiting part 1A for arrangement in the nozzle channel 2A, in a manner closing the nozzle housing 2 axially on one side and thus delimiting the nozzle channel 2A axially on one side, in order to close the nozzle channel 2A remotely from the fluid inlet/compressed-air inlet 13. According to this embodiment example, the delimiting part 1A is formed in one piece with the nozzle body 1. The delimiting part 1A has a further through-duct 1B, extending along the longitudinal axis direction A, for the thread F or fibre band FB for communicating with the through-duct 15 of the nozzle body 1. The further through-duct 1B and the through-duct 15 are arranged coaxially along the longitudinal axis direction A and have the same cross-sectional shape.

[0054] According to an embodiment example that has not been shown, the delimiting part 1A can be configured as a separate component; in this case, the delimiting part can be arranged directly on the nozzle body 1 in such a way that the further through-duct 1B merges directly into the through-duct 15 and bears the nozzle body 1, in particular by means of an integral bond, frictional connection or interlocking.

[0055] Remotely from the delimiting part 1A, the nozzle body 1 forms an intermediate annular gap 18 together with the wall 2B of the nozzle housing 2 over the extension length of the nozzle body 1. The annular gap 18 extends in the nozzle channel 2A along the longitudinal axis direction A, having a first narrow point 19, towards which the annular gap 18 tapers on both sides along the longitudinal axis direction A and which is formed downstream of the compressed-air inlet 13 along the longitudinal axis direction A, and having a second narrow point 20 at the level of the free end of the nozzle body 1. According to this embodiment example, the annular gap 18 forms a nozzle up to the relevant first 19 and second narrow point 20, and a diffuser downstream of the first narrow point 19. In the region of the compressed-air inlet 13, a flow chamber 5 is thus formed in the annular gap 18, from which flow chamber a compressed-air flow propagates towards the first narrow point 19 once the compressed air has been admitted via the compressed-air inlet 13.

[0056] Downstream of the nozzle body 1 along the longitudinal axis direction A, there is a hollow-body-like flow conducting body 7 for guiding the thread F or fibre band FB, in a manner accompanied by fluid, between the annular gap 18 and the open end of the nozzle channel 2A, the flow conducting body 7 forming a rotation chamber 6 downstream of the nozzle body 1. In this embodiment example, the flow conducting body 7 is formed by the nozzle housing 2. FIG. 2 shows a multifunctional nozzle 200 according to a further embodiment example, which differs from the embodiment example described above in relation to FIG. 1 on account of the configuration of the flow conducting body 7. In the embodiment example shown in FIG. 2, the flow conducting body 7 is configured as a separate component that is coupled to the nozzle housing 2 in the nozzle channel 2A. For this purpose, a fixed end 7A is secured in the nozzle channel 2A on the inside of the wall 2B on the nozzle housing 2. The flow conducting body 7 extends from the fixed end 7A as far as to a free end 7B, which in the two embodiment examples simultaneously defines the open end of the nozzle channel 2A. According to both embodiment examples, the flow conducting body 7 is formed so as to be similar to a Laval nozzle in cross section along the longitudinal axis direction A.

[0057] By means of the multifunctional nozzle 100, 200 according to the above-described embodiment examples, a vortex air flow W can be generated once a pressurised fluid, in particular compressed air, has been admitted. Once the compressed air has been admitted via the compressed-air inlet 13, a flow circulating around the nozzle body 1 is generated in the flow chamber 5; due to the prevailing positive pressure and the delimiting part 1A, said flow is directed towards the first narrow point 19 in a manner circulating around the nozzle body 1. As per the principle of a nozzle, the vortex air flow W is accelerated past the first narrow point 19 and the second narrow point 20. At the free end of the nozzle body 1, the accelerated vortex air flow W generates a vacuum in the through-duct 15. By means of the vacuum, a suction flow is brought about in the through-duct 15 and is capable of introducing and pulling in a thread F or fibre band FB in the insertion direction B. The vortex air flow W passing by the second narrow point 20 and by the free end of the nozzle body 1 can rotate unimpeded within the free portion of the flow conducting body 7, said free portion being arranged downstream of the nozzle body 1 and defining the rotation chamber 6, and can propagate towards the open end of the nozzle channel 2A. In the process, the vortex air flow W is accelerated towards the open end of the nozzle channel 2A axially or, in other words, along the longitudinal axis direction A by the Laval nozzle-like cross-sectional shape of the flow conducting body 7.

[0058] In combination with the introduction of a thread F or fibre band FB, the thread F or fibre band FB introduced into the further through-duct 1B is sucked towards the rotation chamber 6 by means of the suction flow generated in the through-duct 15 and the further through-duct 1B when compressed air is fed in via the compressed-air inlet 13. At the same time, the guided thread F or the guided fibre band FB is set into a rotational motion about its longitudinal axis and about the axis of the insertion direction B or longitudinal axis direction A. The rotation about its own longitudinal axis is determined by a clamping point, located outside the multifunctional nozzle 100, 200 in the opposite direction to the longitudinal axis direction A, during the guidance of the thread or fibre band. For example, the thread F or fibre band FB can be clamped outside the multifunctional nozzle 100, 200 by means of a thread take-up device 12 or by means of a thread feed apparatus, as will be explained in more detail below on the basis of preferred embodiment examples.

[0059] Once the thread F or fibre band FB introduced into the multifunctional nozzle 100, 200 has left the nozzle body 1, it undergoes a rotation about the axis of the insertion direction B at a larger rotation diameter, which is limited by the internal diameter of the rotation chamber 6 or of the flow conducting body 7.

[0060] FIG. 4 is a schematic sectional view of an open-end spinning device 400 according to an embodiment example, comprising a multifunctional nozzle 300 according to a third embodiment example. In the multifunctional nozzle 300 according to the third embodiment example, the wall 2B of the nozzle housing 2 has, in addition to the multifunctional nozzle 200 according to the second embodiment example, an extension length along the longitudinal axis direction A that is such that the nozzle housing 2 protrudes beyond the free end 7B of the flow conducting body 7 along the longitudinal axis direction A. In addition, a fibre inlet 4 is formed in the wall 2B of the nozzle housing 2, downstream of the fixed end 7A of the flow conducting body 7 along the longitudinal axis direction A. The fibre inlet 4 opens in a space, which is formed between the flow conducting body 7 and the wall 2B of the nozzle housing 2 and defines a fibre duct 4A. The fibre inlet 4 can be coupled to a fibre feed apparatus, for example a fibre opening unit known from the rotor spinning machine field, in order to be able to feed opened or separated fibres FS to the multifunctional nozzle 300 via the fibre duct 4A.

[0061] An axial end of a spinning-chamber housing 8 is interchangeably linked to the nozzle housing end 2 by means of the wall 2B protruding beyond the flow conducting body 7 along the longitudinal axis direction A. In this preferred embodiment example, the coupling is implemented by means of an airtight press fit between the relevant mutually facing end faces of the nozzle housing 2 and the spinning-chamber housing 8; these can be detached and secured by being withdrawn and plugged along the longitudinal axis direction A in order to change the spinning-chamber housing 8. The spinning-chamber housing 8 has a cross-sectional shape similar to a Laval nozzle along the longitudinal axis direction A, the converging spinning-chamber housing segment downstream of the nozzle housing 2 along the longitudinal axis direction A forming a spinning chamber 9. In the diverging spinning-chamber housing segment, the spinning-chamber housing 8 comprises a fibre outlet 16 that can be connected to a vacuum source.

[0062] The open-end spinning device 400 comprises a thread take-up device 12, which is arranged along the thread travel path in order to take off, from the multifunctional nozzle 300, a thread F that has been air-spun by said multifunctional nozzle, in a controlled manner. In this embodiment example, the thread take-up device 12 is formed by means of a roller pair that can be driven in a defined manner. Alternatively, in an embodiment example that has not been shown, the thread take-up device 12 can be implemented, for example, by means of a winding device that is designed to wind up a take-up package, the winding up simultaneously bringing about the thread take-off. As a further alternative, the thread take-up device 12 can be implemented by a thread accumulator, by means of which a defined amount of thread can be stored. In particular, a thread accumulator of this kind favours continual spinning operation while a thread break is being remedied, for example by means of a thread splicing apparatus.

[0063] Using the open-end spinning device 400, an open-end spinning method can be carried out to generate a real twist yarn. For this purpose, in particular during a piecing process, a positive pressure first needs to be applied to the compressed-air inlet 3 to admit compressed air, and a vacuum needs to be applied to the fibre outlet 16. This can be done simultaneously or in a desired order. Next, a thread end of a thread F has to be presented to the multifunctional nozzle 300 at the further through-duct 1B or inserted into the further through-duct 1B in a defined manner. The applied positive pressure brings about a suction flow in the further through-duct 1B, via which the thread end can be reliably sucked into the further through-duct 1B or guided via the through-duct 15 of the nozzle body 1 as far as into the rotation chamber 6. The vortex air flow W generated by means of the positive pressure, in a manner favourably assisted by the vacuum, acts on the thread end introduced into the rotation chamber 6, as a result of which the thread end or the thread F is rotated and the thread end or the thread F is entrained along the longitudinal axis direction A. The fibre feed for feeding separated fibres FS is activated. The vacuum applied to the fibre inlet 4 or the applied suction flow brings about a feed of separated fibres FS from the fibre opening unit coupled to the fibre inlet 4. The separated fibres FS are rotationally entrained as far as into the spinning chamber 9 by the vortex air flow W at the end of the nozzle body 1. The thread end and the separated fibres FS can be fed either simultaneously or staggered in a desired order. The separated fibres FS can generally be fed continuously or in intervals, depending on requirements. As soon as the thread end and the fibres FS have arrived in the spinning chamber 9, accompanied by the vortex air flow W, the rotating separated fibres FS adhere to the thread end, which is likewise rotating, thereby producing a new air-spun thread section having a real twist without an internal untwisted core. Superfluous fibres FS are simultaneously carried away through the fibre outlet 16 by means of the applied vacuum. When a vacuum and a positive pressure are applied during the feed of the separated fibres FS, the thread F is drawn out of the multifunctional nozzle 300, in the opposite direction to the insertion direction B of the thread end, by means of the thread take-up device 12 at a take-off speed that allows separated fibres FS to constantly accumulate at the newly forming thread end in order to air-spin the thread F having a real twist.

[0064] FIG. 5 is a schematic sectional view of a spinning chamber 9 according to an embodiment example for an open-end spinning device 400 comprising a multifunctional nozzle 300 according to a third embodiment example. Transversely to the longitudinal axis direction A, the spinning chamber 9 has a cross-sectional shape similar to a rotor cup interior, having an internal diameter along which the mouths of the flow conducting body 7 of the fibre duct 4A and of the fibre outlet 16 are arranged for communicating with the spinning chamber 9. According to this embodiment example, the mouth of the flow conducting body 7 is arranged radially internally and coaxially with the spinning chamber 9 and has a circular cross section, the mouth of the fibre outlet 16 is arranged radially externally and has a cross section similar to an annular gap surrounding the mouth of the flow conducting body 7, and the mouth of the fibre duct 4A is arranged therebetween in the radial direction and has a cross section similar to an annular gap surrounding the mouth of the flow conducting body 7. The mode of action and operation of the spinning chamber 9 according to this preferred embodiment example is the same as in the above-described spinning chamber 9. Using a spinning chamber 9 of this kind, which is similar to a rotor cup interior in cross section, allows for a compact design and for the use of known and tried-and-tested rotor cup geometries.

[0065] FIG. 6 is a schematic sectional view of a spinning device 500 comprising a multifunctional nozzle 200 shown in FIG. 2. The spinning device 500 is associated with a fibre band feed 10, which, according to this embodiment example, is formed by an output roller pair of a drafting system device 600 for the defined drawing of the fibre band feed FB. The spinning device 500 comprises the multifunctional nozzle 200 according to the second embodiment example for receiving the drawn fibre band FB. A delimiting sleeve 11 is arranged downstream of the multifunctional nozzle 200 in an insertion direction B or feed direction of the fibre band FB, followed by a rotatably drivable spindle 21. The spindle 21 is configured to rotatably bear an empty tube 22, in particular so as to entrain it in a manner correlated with the direction of rotation of an vortex flow W generated in the multifunctional nozzle 200. The spindle 21 along with the empty tube 22 are together rotatably borne by a spindle rail (not shown). The spindle rail is configured to perform a linear stroke movement back and forth along the axis of rotation of the spindle 21 or of the empty tube 22, while entraining the spindle 21 together with the empty tube 22. For this purpose, the delimiting sleeve 11 comprises a cavity 11A, in which the empty tube 22 borne by the spindle 21 can be at least partly received in an upward end position of the stroke movement. The multifunctional nozzle 200 is connected to the delimiting sleeve 11 in such a way that the thread F generated by the multifunctional nozzle 200 can be seamlessly transferred from the nozzle channel 2A into the cavity 11A in order to enable winding of a defined winding region of the empty tube 22 during the stroke movement of the spindle rail, carried out relative to the delimiting sleeve 11, together with the rotation of the spindle 21 having the empty tube 22. The above-described construction is predominantly similar to a workstation of a ring spinning machine, apart from the fact that the multifunctional nozzle 200 having the delimiting sleeve 11 is used instead of a conventional ring traveller system. Replacing the ring traveller system favours the elimination of the physical limits imposed by that system, meaning that the thread F having a real twist can be generated at higher spinning speeds than in a conventional ring spinning machine, thus resulting in quicker winding of the empty tubes 22 and greater productivity.

[0066] FIG. 7 is a schematic sectional view of a drafting system device 600 comprising a multifunctional nozzle 100 shown in FIG. 1. The drafting system device 600 has a plurality of roller pairs 23, 24 in a fibre band transport direction, which corresponds to the longitudinal axis direction A of the multifunctional nozzle 100. As usual, each roller pair 23, 24 can be driven at a different rotational speed in order to draw, in a defined manner, the fibre band FB being transported by said roller pairs 23, 24. A corresponding drafting zone is thus formed between said roller pairs 23, 24. According to this embodiment example, the multifunctional nozzle 100 is arranged in the drafting zone between the two roller pairs 23, 24 to receive the fibre band FB from one roller pair 23 and forward it to the other roller pair 24. During operation of the drafting system device 600 and when a positive pressure is applied to the fluid inlet/compressed-air inlet 13, the fibre band FB guided through the multifunctional nozzle 100 undergoes a false spin, which increasingly strengthens in the fibre band transport direction as far as to a clamping region of the roller pair 24 arranged downstream of the multifunctional nozzle 100. The fibre band composite can be reliably compressed by means of the active twist, since any edge fibres sticking out can be readily bound into the fibre band composite and the fibre band composite undergoes efficient tapering or compacting in its width direction.

[0067] The embodiment examples described above and shown in the figures are only selected by way of example. Different embodiment examples can be combined with one another completely or with regard to individual features. An embodiment example can also be supplemented with features of a further embodiment example.

[0068] If an embodiment example has an and/or link between a first feature and a second feature, this should be understood to mean that the embodiment example according to one embodiment comprises both the first feature and the second feature and, according to a further embodiment, comprises either only the first feature or only the second feature.

TABLE-US-00001 List of reference signs 1 Nozzle body .sup.1A Delimiting part .sup.1B Further through-duct 2 Nozzle housing .sup.2A Nozzle channel .sup.2B Wall of the nozzle housing 3 Further compressed-air inlet 4 Fibre inlet .sup.4A Fibre duct 5 Flow chamber 6 Rotation chamber 7 Flow conducting body .sup.7A Fixed end of the flow conducting body .sup.7B Free end of the flow conducting body 8 Spinning-chamber housing 9 Spinning chamber 10 Fibre band feed 11 Delimiting sleeve .sup.11A Cavity in the delimiting sleeve 12 Thread take-up device 13 Compressed-air inlet 14 Antechamber housing 15 Through-duct 16 Fibre outlet 17 Compressed-air chamber 18 Annular gap 19 First narrow point 20 Second narrow point 21 Spindle 22 Empty tube 23, 24 Roller pair 100, 200, 300 Multifunctional nozzle 400 Open-end spinning device 500 Spinning device 600 Drafting system device A Longitudinal axis direction B Insertion direction of the thread or fibre band C Mouth axis F Thread FB Fibre band FS Fibre W Vortex air flow