EP3155151B1 - Spinneret for an air jet spinning machine and air jet spinning machine having a corresponding spinneret - Google Patents

Description

The present invention relates to a spinneret for an air spinning machine, which serves for the production of roving from a fiber structure, wherein the spinneret has an inlet opening for the entry of a fiber composite, wherein the spinneret has a vortex chamber of an at least partially limited vortex chamber, the inlet opening in a arranged in the installed state of the spinneret predetermined transport direction of the fiber assembly, wherein the spinneret has a spaced from the inlet opening in the transport direction opening through which a hollow spindle is inserted into the vortex chamber, wherein the spinneret has at least one spin air duct, via the air into the interior Whirl chamber can be introduced, wherein the spinning air duct extends between a spinning air inlet opening and a spinning air outlet opening and the spinning air inlet opening in the region of an outer side of the spinneret and the spinning air outlet The spinneret has at least one Anspinnluftkanal via which also air into the interior of the vortex chamber can be introduced, wherein the Anspinnluftkanal extends between a Anspinnluft inlet opening and a Anspinnluft outlet opening and the piecing air Inlet opening in the region of said outside of the spinneret and the Anspinnluft outlet opening in the region of said inner side of the Wirbelkammerwandung is arranged, and wherein the spinning air inlet opening and the Anspinnluft inlet opening are spaced apart in said transport direction.

In addition, an air spinning machine for producing roving from a fiber structure is described, wherein the air spinning machine comprises at least one spinning station with a spinneret, and wherein the spinning station is formed, one of the spinneret in a transport direction supplied fiber strand within a partially limited by the spinneret vortex chamber with the help to give a rotation to an air flow.

Roving is produced with the aid of roving machines, usually with the aid of stretch-pretreated (eg doubled) slivers, and serves as a template for the subsequent spinning process in which the individual fibers of the roving are spun into a fiber yarn, for example by means of a ring spinning machine , In order to give the roving a certain strength, it has been proven to stretch the submitted fiber structure during the production of the roving using a drafting system, which is usually part of the roving, and then to provide a protective rotation. Said strength is important to prevent ripping of the roving during winding on a spool or during the supply to the downstream spinning machine. However, the protective rotation granted may only be so strong that a cohesion of the individual fibers is ensured during the individual winding and unwinding operations as well as corresponding transport processes between the respective machine types. On the other hand, despite the protective rotation, it must be ensured that the roving can be further processed in a spinning machine - the roving must therefore continue to be delayable.

In order to produce a corresponding roving, so-called flyers are primarily used, but their delivery speed is limited due to centrifugal forces occurring. Therefore, there were already many suggestions to bypass the flyer or to replace it with an alternative machine type (see for example EP 0 375 242 A2 . DE 32 37 989 C2 ).

Among other things, it has already been proposed in this context to produce roving by means of air spinning machines, in which the protective rotation is generated by means of air currents. The basic principle here is to guide a fiber structure through a vortex chamber in which an air vortex is generated by means of spinning air nozzles. This finally causes a part of the outer fibers to be wound around the centrally extending fiber strand as so-called binding fibers, which in turn consists essentially of mutually parallel core fibers.

However, as with the spinning of yarn, it is also regularly necessary in the production of roving to spin the fiber strand supplied to the roving frame before the actual spinning process can be started. An appropriate piecing may be required, for example, when turning on the spinning machine or after a rip of the roving or fiber dressing, in which case the fiber strand is introduced into the swirling chamber where it is subjected to fluidized air flow to rotate the inserted initial section of the fiber strand and thereby starting the actual production of roving. However, the vortex air flow at this initial stage usually has a different characteristic than during regular spinning operation in which the vortex chamber is already passed by a continuous fiber strand (the fiber strand is made up of the fiber structure in the region of the inlet opening of the spinneret and within the vortex chamber the roving produced by the fiber structure and the vortex chamber leaving a vortex channel together).

It has therefore proven useful, in addition to the spinning air nozzles, which are used during the piecing process following spinning operation to provide additional Anspinnluftdüsen that also open tangentially into the swirl chamber, but have a relation to the Anspinndüsen changed orientation. During piecing, usually only (or in addition to the spinning air nozzles) the Anspinnluftdüsen be pressurized with compressed air, resulting in an optimized for the start of Vorgarnherstellung air flow within the vortex chamber.

However, since the spinning air nozzles and Anspinnluftdüsen must be able to be acted upon separately with compressed air, separate air supplies are required for the above types of air nozzles, all of which must be accommodated in the limited space of the spinneret.

The object of the present invention is to propose a spinneret and an air-spinning machine equipped therewith for the production of roving in which the individual flow sections for the spinning and piecing air are advantageously positioned and aligned.

JP S61 119725 discloses a pneumatically operated nozzle.

DE102007006674 discloses an air-spinning device for producing a thread by means of a circulating air flow. DE 102 51 727 A1 DE10351727 discloses a method and apparatus for making a flyer.

WO 2013/003962 A1 discloses a roving machine for producing a roving according to the preamble of claim 1.

The object is achieved by a spinneret and an air-jet spinning machine having the features of the independent patent claims.

According to the invention, the spinneret is characterized in that the at least one piecing air channel extends at least partially opposite to the transport direction, starting from its piecing air inlet opening, wherein the spinneret is the part of a corresponding air spinning machine which surrounds or forms the vortex chamber and the spinning air nozzles and Anspinnluftdüsen at least partially comprises (wherein the spinneret itself may be formed one or more parts). While it is always provided in known spinnerets to lead the Anspinnluft exclusively in the transport direction, the solution according to the invention has the advantage that the Anspinnluft inlet openings (over which the Anspinnluft enters the Anspinnluftkanal) seen in the transport direction after the spinning air inlet openings (on the the spinning air enters the spin air duct) can be placed.

The Anspinnluft outlet openings (over which the Anspinnluft enters the vortex chamber) can thus be placed in the transport direction approximately at the height of the spinning air outlet openings, yet both air channels (spinning air duct and Anspinnluftkanal) can be supplied by different sources of compressed air.

Generally, it should be noted at this point that in the following description usually only a spinning air duct and a Anspinnluftkanal are described. Of course, it is advantageous if the spinneret several Spinnluftkanäle and Anspinnluftkanäle several (with the respective associated inlet and outlet openings has), wherein the respective outlet openings should open tangentially into the vortex chamber. The features described with respect to the respective one spinning air channel or the one piecing air channel are therefore transferable to the remaining spinning air or piecing air channels of the corresponding spinneret.

In the context of the invention, it is extremely advantageous if the Anspinnluftkanal comprises a first channel section, which extends from the Anspinnluft inlet opening within the Wirbelkammerwandung at least partially opposite to the transport direction, wherein the Anspinnluftkanal beyond a second channel section includes, extending from the first channel portion in the direction of Anspinnluft-outlet opening. The Anspinnluftführung in this case is not continuous straight. Rather, the course of Anspinnluftkanals (which generally extends between the Anspinnluft inlet opening placed in the region of the outside and the Anspinnluft-outlet opening into the swirl chamber) within the Wirbelkammerwandung changes at least once. For example, it is conceivable that the first channel section, starting from the piecing air inlet opening, runs counter to the transport direction and parallel to a central axis of the spinneret. Within the vortex chamber wall, he finally goes over, for example via a kink, in the second channel section, which in turn extends in the direction of the vortex chamber.

Particular advantages arise when the first channel section (in a side view of the spinneret) encloses an angle with a central axis of the spinneret whose magnitude is 0 ° to 30 °, preferably 0 ° to 15 °, particularly preferably 0 ° to 10 °, is. While an angle of 0 ° means that the first channel section is parallel to the central axis of the spinneret, an angle greater than 0 ° results in the first channel section being inclined with respect to the central axis.

Furthermore, it is advantageous if the first channel section and / or the second channel section have a rectilinear central axis. In this case, the respective channel section can be made through a corresponding bore which is introduced into the vortex chamber wall. In addition, impairments of the respective air currents are avoided. The diameters of the respective channel sections are preferably the same size or deviate from each other by only a maximum of 20%.

It is also advantageous if the first channel section and / or the second channel section is formed by a bore introduced from the outside of the spinneret into the spinneret. Such a bore can be easily and especially, with respect to its orientation, very precisely introduced.

In this context, it is particularly advantageous if the first channel section and the second channel section through a from the outside of the spinneret in the spinneret introduced bore is formed, wherein the respective holes intersect within the Wirbelkammerwandung. The intersection of both holes represents in this case the transition from the first to the second channel section.

It is advantageous if the said holes are closed at least on one side in the region of the outside of the spinneret by an airtight seal. In this case, the Anspinnluftkanal can be formed by a plurality of bores, each extending from the outside into the vortex chamber, wherein at least one of the holes can completely penetrate the Wirbelkammerwandung, starting from the outside of the spinneret. By the corresponding sealing of individual bore sections in the region of the outside of the spinneret, finally, a channel system consisting of first and second channel section can be produced, which extends within the vortex chamber wall, was created exclusively by drilling and still allows a bent compressed air guide. Preferably, the first channel section is in this case formed by a first bore extending from an end face of the spinneret and extending in the transport direction, wherein the bore is subsequently sealed in the region of the end face by means of a seal (which is preferably glued in). The second channel portion is in this case vorzgusweise formed by a second bore which extends from an extending between the two end faces of the spinneret outside to the vortex chamber, both holes intersect within the Wirbelkammerwandung and sealed the second bore in the outer side is. If now the first hole drilled in the transport direction behind the second hole drilled from the outside, the result is the necessary Anspinnluft inlet opening, so the Anspinndruckluft finally on the Anspinnluft inlet opening and the adjoining first bore into the region of the second bore and from there, pour into the vortex chamber.

It is thus particularly advantageous if the second channel section branches off from the first channel section between a seal of the first channel section and the piecing air inlet opening. The two channel sections intersect in this case within the Wirbelkammerwandung, wherein the first channel section on the one hand via its Anspinnluft inlet opening can be supplied and is hermetically sealed on the other side by a seal. In this case, the second channel section extends from the piecing air outlet opening into the first channel section. The further course of the second channel section forming hole is finally closed between the first channel section and the outside of the spinneret with the aid of said seal, so that within the Wirbelkammerwandung a forced operation for the piecing air is present such that this exclusively from the Anspinnluft inlet opening the first channel portion and from there via the second channel portion and the Anspinnluft-outlet opening can flow into the vortex chamber.

It also brings advantages when the second channel section branches off at an angle α from the first channel section, wherein the amount of said angle is 40 ° to 80 °, preferably 45 ° to 75 °, particularly preferably 50 ° to 70 °. Such an angle causes an air flow, which does not have to be redirected again before entering the vortex chamber and thus promises a successful piecing without further intervention.

It has particular advantages when the Anspinnluft inlet opening is arranged in the transport direction after the spinning air outlet opening and / or after the piecing air outlet opening. It also brings advantages when the Anspinnluft inlet opening is arranged in the transport direction after the spinning air inlet opening. Contrary to the transport direction, the Anspinnluft inlet opening is thus placed in the first place, wherein the spinning air inlet opening can be located approximately at the height of the spinning air outlet opening and / or the Anspinnluft outlet opening.

Furthermore, it is advantageous if the spinning-air outlet opening and the piecing-air outlet opening are arranged in a common plane extending perpendicular to the transport direction or less than 3 mm, preferably less than 2 mm, particularly preferably less than 1 mm, viewed from one another in the transport direction are spaced. Nevertheless, the spin air duct and Anspinnluftkanal of separate Compressed air supplies are supplied, since the spinning air inlet opening and Anspinnlufteintrittsöffnung seen in the transport direction are spaced from each other.

It has particular advantages when the piecing air inlet opening and the piecing air outlet opening seen in the transport direction at least 4 mm, preferably at least 8 mm, more preferably at least 12 mm, and / or less than 30 mm, preferably less than 25 mm, especially preferably less than 20 mm, are spaced from each other. The said areas ensure that sufficient space is available between the respective inlet openings in order to be able to supply them with compressed air via separate compressed-air supplies without the spinneret having to assume such large dimensions here that it would be unsuitable for installation in an air-spinning machine.

The air-jet spinning machine according to the invention for the production of roving is finally distinguished by the fact that it comprises at least one spinning station with a spinneret, wherein the spinning station is formed, one of the spinneret in a transport direction supplied fiber strand within a partially limited by the spinneret vortex chamber by means of an air flow Rotation, and wherein the spinneret has the features according to the invention the previous or subsequent description. The features can be realized individually or in any combination, as long as it does not lead to contradictions.

In this context, it is advantageous if the spinneret has a plurality of spinning air ducts and a plurality of Anspinnluftkanäle spaced apart in the transport direction, wherein the spinning air inlet openings of the spinning air ducts and Anspinnluft inlet openings of Anspinnluftkanäle by sealing elements, preferably in the form of sealing rings, are separated. The spinning-air inlet openings and the piecing-air inlet openings are preferably arranged in the region of the outside of the spinneret, in particular on a surface section of the same between the end faces of the spinneret. Consequently, the corresponding compressed-air sources for the spinning and piecing air in the region of the outside of the spinneret also open into the respective air channels. By the sealing elements is finally ensured that between the spinning air ducts and Anspinnluftkanälen in the region of the outside of the spinneret no air exchange is possible. Both types of air ducts can thus be acted upon independently, preferably alternately, with compressed air, without there being any unwanted leakage air flows.

It is also extremely advantageous if the sealing elements are placed in the region of an outer side of the spinneret and preferably enclose them circumferentially. Preferably, the sealing elements are designed as annular sealing rubbers, wherein it is particularly advantageous if in each case a sealing element (seen in the transport direction) between the inlet opening of the spinneret and the spinning air inlet openings, between the spinning air inlet openings and the piecing air inlet openings and between the piecing air inlet openings and the opening of the spinneret over which the roving leaves the spinneret are arranged.

Finally, it is advantageous if the spinning station has a spinneret-receiving carrier element, wherein the carrier element has a spinning air inlet openings adjacent and in fluid communication therewith spinning air chamber, and wherein the carrier element adjacent to Anspinnluft inlet openings and in fluid communication Anspinnluftkammer having. The carrier element may, for example, have a bore into which the spinneret is inserted (the attachment of the spinneret in the carrier may, for example, be realized by means of screws). Furthermore, it is advantageous if the air chamber and the piecing air chamber are airtight separated from each other by means of the sealing elements mentioned in the previous section.

Figur 1

eine Seitenansicht einer Luftspinnmaschine,

Figur 2

eine Schnittdarstellung einer bekannten Spinndüse,

Figur 3

eine Schnittdarstellung einer erfindungsgemäßen Spinndüse,

Figur 4

eine Ansicht einer erfindungsgemäßen Spinndüse mit Blick gegen die Transportrichtung,

Figur 5

eine Schnittdarstellung einer weiteren erfindungsgemäßen Spinndüse,

Figur 6

die Ansicht gemäß Figur 5 mit abgedichtetem Anspinnluftkanal,

Figur 7

eine Schnittdarstellung der Spinndüse gemäß Figur 6, wobei die Spinndüse in einem Trägerelement der Luftspinnmaschine gehalten ist, und

Figur 8

eine weitere Schnittdarstellung der Anordnung gemäß Figur 7.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

FIG. 1

a side view of an air-spinning machine,

FIG. 2

a sectional view of a known spinneret,

FIG. 3

a sectional view of a spinneret according to the invention,

FIG. 4

a view of a spinneret according to the invention with a view towards the transport direction,

FIG. 5

a sectional view of another spinneret according to the invention,

FIG. 6

the view according to FIG. 5 with sealed Anspinnluftkanal,

FIG. 7

a sectional view of the spinneret according to FIG. 6 wherein the spinneret is held in a carrier element of the air-spinning machine, and

FIG. 8

a further sectional view of the arrangement according to FIG. 7 ,

FIG. 1 shows a schematic view of a section of an air-jet spinning machine according to the invention, which serves to produce roving 1. If required, the air-spinning machine can comprise a drafting system 25 with a plurality of corresponding drafting rollers 24, which are supplied with a fiber structure 2, for example in the form of a relined conveyor belt. Furthermore, the air spinning machine shown in principle comprises a spaced apart from the drafting 25 yarn-forming unit 33 with an internal and shown in the following figures spinneret 3 and a in FIG. 2 shown Garnbildungselement 8 in the form of a hollow spindle, wherein the spinneret 3 at least partially limits a vortex chamber 6. In the vortex chamber 6, the fiber structure 2 or at least a part of the fibers of the fiber composite 2 is provided with a protective rotation.

Likewise, the air-spinning machine may include a take-off unit 27 with preferably two take-off rollers 26 for the roving 1 (the take-off unit 27 is not absolutely necessary). Furthermore, one of the trigger unit 27 or the yarn-forming unit 33 downstream winding device 31 is present, which in turn should include at least one sleeve drive 30 and one associated with the sleeve drive 30 and in principle known (but not shown) sleeve receptacle, with the aid of which a sleeve 29 can be fixed and set into rotary motion via the sleeve drive 30 in order to be able to wind the roving 1, preferably supported by a traversing unit 28, onto the sleeve 29.

The air-jet spinning machine works according to a special air-spinning process. To form the roving 1, the fiber structure 2 is guided in a transport direction T via an inlet opening 4 shown in the following figures into the swirl chamber 6 of the spinneret 3 of the yarn-forming unit (wherein the spinneret 3 embodied according to the invention is inserted into the FIGS. 3 to 8 is shown in more detail). There it receives a protective rotation, ie at least part of the fibers of the fiber composite 2 is detected by an air flow, which is generated by appropriately placed spinning air channels 9. A part of the fibers is hereby pulled out of the fiber structure 2 at least a little bit and wound around the tip of a yarn formation element 8 projecting into the swirl chamber 6.

Finally, the fibers of the fiber composite 2 via an inlet opening 35 of the Garnbildungselements 8 (see FIG. 2 ) and disposed within the Garnbildungselements 8 and adjoining the inlet opening 35 exhaust duct 34 withdrawn from the vortex chamber 6. In this case, finally, the free fiber ends are drawn on a spiral path in the direction of the inlet opening 35 and loop as Umwindefasern to the centrally extending core fibers - resulting in the desired protective rotation having roving. 1

The roving 1 has by the only partial rotation of the fibers a delaying ability, which is essential for the further processing of the roving 1 in a subsequent spinning machine, such as a ring spinning machine. By contrast, conventional air-spinning devices impart to the fiber structure 2 such a strong rotation that the necessary distortion following the yarn production is no longer possible. This is also desirable in this case, since conventional air spinning machines are designed to produce a finished yarn, which should usually be characterized by a high strength.

FIG. 2 shows a spinneret 3 according to known prior art. As can be seen from this figure, the Garnbildungselement 8, which also in the case of using the in the FIGS. 3 to 8 spinneret 3 according to the invention would be present, against the transport direction T and through a corresponding opening 7 in the vortex chamber 6. Furthermore, all of the spinnerets 3 shown in the figures have a vortex chamber wall 5 which, for example and at least in sections, can have a circular cross-section. Finally, the vortex chamber wall 5 has an outer side 12 delimiting the spinneret 3 to the outside and an inner side 13 delimiting the vortex chamber 6 (whereby the vortex chamber wall 5 could generally also be designed in several parts). Finally, spinning air channels 9 are present, via which during the Vorgarnherstellung spinning air can be introduced into the vortex chamber 6, the spinning air channels 9 have a spinning air inlet opening 10 and an opening into the vortex chamber 6 spinning air outlet opening 11.

In contrast to the execution according to FIG. 2 own those in the FIGS. 3 to 8 shown, inventively designed spinnerets 3 now next to the spinning air ducts 9 more Anspinnluftkanäle 14, can be introduced through the during the aforementioned piecing compressed air into the vortex chamber 6 in order to produce a specially for piecing optimal Vorbelluftströmung within the vortex chamber 6.

How in this context of the synopsis of Figures 3 and 4 it can be seen, the Anspinnluftkanäle 14 extending from their Anspinnluft-inlet openings 15 at least partially opposite to the transport direction T ( FIG. 3 shows in principle a section along the line AA in FIG. 4 ). In this way, it is again possible to place the Anspinnluft-inlet openings 15 of Anspinnluftkanäle 14 in the transport direction T to the corresponding piecing air outlet openings 16 through which the Anspinnluftkanäle 14 open into the swirl chamber 6.

As it turned out FIG. 3 Moreover, the Anspinnluftkanäle 14 preferably comprise at least a first channel portion 17 and a second channel portion 18, the first channel portion 17, starting from the piecing air inlet opening 15 into the second channel section 18, which finally via the Anspinnluft-outlet opening 16 into the vortex chamber 6 opens.

Both channel sections 17, 18 in this case enclose an angle α, the amount of which is preferably in the range lying in the general description. In addition is it is advantageous if the first channel section 17 extends parallel to a central axis 32 of the spinneret 3, as also shown in FIG FIG. 3 is shown.

A possible constructive solution to bring the two channel sections 17, 18 by drilling in the Wirbelkammerwandung 5, shows a comparison of Figures 5 and 6 (which also show a section of a spinneret 3, wherein the section also passes through a line which in terms of their position of the line AA in FIG. 4 corresponds).

How FIG. 5 can be seen, the said channel sections 17, 18 can now be prepared by a respective bore, which intersect within the duct wall. To prevent over the Anspinnluft inlet opening 15 introduced piecing air (based on FIG. 5 ) exits upwardly or outwardly from the Anspinnluftkanal 14, it is provided, the individual channel sections 17, 18 as in FIG. 6 shown to close. For this purpose, appropriate seals 20 may be used, which consist for example of plastic and can be glued into said holes. The result is a Anspinnluftkanal 14, which allows despite the production by drilling an air deflection within the Wirbelkammerwandung 5. In this way, the Anspinnluft seen in the transport direction T can be introduced after the piecing air outlet openings 16 via the Anspinnluft-inlet openings 15 so that the Anspinnluft inlet openings 15 can be placed almost anywhere on the outer side 12 of the spinneret 3.

One to the Figures 5 and 6 alternative placement of Anspinnluft-inlet openings 15 shows FIG. 7 , As can be seen from this figure, the Anspinnluft-inlet openings 15 are not arranged in the region of an end face of the spinneret 3, but in the region of its running between the two end faces outside 12, wherein the Anspinnluft inlet openings 15 also by (preferably perpendicular to the central axis 32 of the spinneret 3 extending) holes are formed. Further is FIG. 7 It can be seen that the spinneret 3 is preferably held in a carrier element 21 of the air-spinning machine, which of course should have holding elements or fastening elements, not shown, in order to be able to fix the spinneret 3 (the illustration in FIG FIG. 7 is therefore only to be understood schematically). The carrier element 21 in turn has a Anspinnluftkammer 23, which may be formed, for example, as the spinneret 3 surrounding annular groove and which is not shown at location with a compressed air supply in combination to bring about the Anspinnluftkanäle 14 compressed air into the vortex chamber 6.

Finally shows FIG. 8 in principle, the execution according to FIG. 7 , In contrast to FIG. 7 However, the cut was made by the corresponding spinneret 3 not by a Anspinnluftkanal 14, but a spinning air channel 9. In particular, the cut was made along a line from the placement of the line BB in FIG. 4 corresponds (even if the execution according to FIG. 4 in some respects from the execution according to FIG. 8 differs). It should also be noted that the in FIG. 8 shown and explained in more detail below features also in the spinneret 3 according to FIG. 7 are present, even if these are in FIG. 7 for reasons of clarity are partly not shown.

Like now off FIG. 8 can be seen, of course, the spinneret 3 according to the invention a plurality of spinning air channels 9, over the during the piecing process following normal operation of the air spinning spinning air into the vortex chamber 6 can be introduced to produce a roving 1 from the supplied fiber structure 2.

The spinning air channels 9 can also be formed by bores, wherein these each, preferably inclined in the transport direction T, from a spinning air inlet opening 10 placed in the region of the outer side 12 of the spinneret 3 to a spinning air outlet opening 11 of the spinneret located in the region of the inner side 13 3 and communicate with a spinning air channel 9 in connection. This can also be designed as an annular groove and communicates with a separate source of air pressure.

In order to prevent an air exchange between the spinning air chamber 22 and the Anspinnluftkammer 23, it is finally advantageous if said air chambers 22, 23 in the transport direction T are separated by particular annular sealing elements 19, wherein additional sealing elements 19 may be present to the spinning air chamber 22 against the transport direction T and the Anspinnluftkammer 23 in To be able to seal the transport direction to the outside (without said sealing elements 19, compressed air between the spinneret 3 and the carrier element 21 could escape to the outside and thus cause an undesired pressure loss).

As a result, a spinneret 3 is obtained in which the spinning air outlet openings 11 and the piecing air outlet openings 16 lie approximately in one plane. Nevertheless, the spinning air and the piecing air can be introduced via separate air chambers (spinning air chamber 22, Anspinnluftkammer 23), which are seen in the transport direction T spaced from each other.

LIST OF REFERENCE NUMBERS

1

roving

2

fiber structure

3

spinneret

4

inlet port

5

Wirbelkammerwandung

6

swirl chamber

7

opening

8th

Garnbildungselement

9

Spinning air duct

10

Spinning air input port

11

Spinning air outlet opening

12

outside

13

inside

14

Anspinnluftkanal

15

Anspinnluft inlet opening

16

Anspinnluft outlet opening

17

first channel section of Anspinnluftkanals

18

second channel section of Anspinnluftkanals

19

sealing element

20

seal

21

support element

22

Spinning air chamber

23

Anspinnluftkammer

24

Drafting system roller

25

drafting system

26

off roll

27

off unit

28

Traversing device

29

shell

30

sleeve driving

31

spooling device

32

Center axis of the spinneret

33

yarn-forming unit

34

culvert

35

inlet opening

T

transport direction

α

Angle between the first channel portion and the second channel portion

Claims (15)

1. A spinning nozzle for an air-jet spinning machine that is used to produce rovings (1) from a fiber bundle (2),

   - wherein the spinning nozzle (3) has an inlet opening (4) for entry of the fiber bundle (2),

   - wherein the spinning nozzle (3) comprises a vortex chamber (6), which is at least partially delimited by a vortex chamber wall (5) and, in an installed state of the spinning nozzle (3), is arranged downstream of the inlet opening (4) in a predetermined transport direction (T) of the fiber bundle (2),

   - wherein the spinning nozzle (3) comprises an opening (7) that is spaced apart from the inlet opening (4) in the transport direction (T) and via which a yarn

   - forming element (8) can be inserted into the vortex chamber (6),

   - wherein the spinning nozzle (3) comprises at least one spinning air channel (9) via which air can be introduced into the interior of the vortex chamber (6), wherein the spinning air channel (9) extends between a spinning air inlet opening (10) and a spinning air outlet opening (11), and the spinning air inlet opening (10) is situated in the area of an outer side (12) of the spinning nozzle (3), and the spinning air outlet opening (11) is situated in the area of an inner side (13) of the vortex chamber wall (5) that delimits the vortex chamber (6), and the spinning air outlet opening (11) opens into the vortex chamber (6),

   - wherein the spinning nozzle (3) has at least one piecing air channel (14) via which air can also be introduced into the interior of the vortex chamber (6), wherein the piecing air channel (14) extends between a piecing air inlet opening (15) and a piecing air outlet opening (16), and the piecing air inlet opening (15) is situated in the area of the stated outer side (12) of the spinning nozzle (3), and the spinning air outlet opening (16) is situated in the area of the stated inner side (13) of the vortex chamber wall (5), and the piecing air outlet opening (16) opens into the vortex chamber (6), and

   - wherein the spinning air inlet opening (1 0) and the piecing air inlet opening (15) are spaced apart from one another in said transport direction (T),

   characterized in that
   the piecing air channel (14), starting from the piecing air inlet opening (15) thereof, extends at least partially counter to the transport direction (T).
2. The spinning nozzle according to the preceding claim, characterized in that the piecing air channel (14) includes a first channel section (17) which, starting from the piecing air inlet opening (15), extends within the vortex chamber wall (5) at least partially counter to the transport direction (T), and the piecing air channel (14) comprises a second channel section (18) which, starting from the first channel section (17), extends in the direction of the piecing air outlet opening (16).
3. The spinning nozzle according to the preceding claim, characterized in that the first channel section (17) together with a center axis (32) of the spinning nozzle (3) forms an angle of 0° to 30°, preferably 0° to 15°, particularly preferably 0° to 10°.
4. The spinning nozzle according to Claim 2 or 3, characterized in that the first channel section (17) and/or the second channel section (18) have/has a linearly extending center axis.
5. The spinning nozzle according to one of Claims 2 to 4, characterized in that the first channel section (17) and/or the second channel section (18) are/is formed by a borehole that is introduced into the spinning nozzle (3) from the outer side (12) of the spinning nozzle (3).
6. The spinning nozzle according to one of Claims 2 to 5, characterized in that the first channel section (17) and the second channel section (18) are each formed by a borehole that is introduced into the spinning nozzle (3) from the outer side (12) of the spinning nozzle (3), wherein the boreholes intersect within the vortex chamber wall (5).
7. The spinning nozzle according to Claim 5 or 6, characterized in that the boreholes are closed on at least one side in the area of the outer side (12) of the spinning nozzle (3) by an air-tight seal (20), wherein the second channel section (18) preferably branches off from the first channel section (17), between the air-tight seal (20) of the first channel section (17) and the piecing air inlet opening (15).
8. The spinning nozzle according to one of Claims 2 to 7, characterized in that the second channel section (18) branches off from the first channel section (17) at an angle α wherein said angle is between 40° and 80°, preferably between 45° and 75°, particularly preferably between 50° and 70°.
9. The spinning nozzle according to one of the preceding claims, characterized in that the piecing air inlet opening (15)) is situated downstream from the spinning air outlet opening (11) and/or the piecing air outlet opening (16), viewed in the transport direction (T), and/or the piecing air inlet opening (15) is situated downstream from the spinning air inlet opening (10), viewed in the transport direction (T).
10. The spinning nozzle according to one of the preceding claims, characterized in that the spinning air outlet opening (11) and the piecing air outlet opening (16) are situated in a shared plane that extends perpendicularly with respect to the transport direction (T), or are spaced apart from one another by less than 3 mm, preferably less than 2 mm, particularly preferably less than 1 mm, viewed in the transport direction (T).
11. The spinning nozzle according to one of the preceding claims, characterized in that the piecing air inlet opening (15) and the piecing air outlet opening (16) are spaced apart from one another by at least 4 mm, preferably at least 8 mm, particularly preferably at least 12 mm, and/or by less than 30 mm, preferably less than 25 mm, particularly preferably less than 20 mm, viewed in the transport direction (T).
12. An air spinning machine for producing rovings (1) from a fiber bundle (2),

    - wherein the air spinning machine includes at least one spinning station having a spinning nozzle (3) according to one of the preceding claims, and

    - wherein the spinning station is designed to provide a twist rotation to a fiber bundle (2), supplied to the spinning nozzle (3) in a transport direction (T), within the vortex chamber (6) that is partially delimited by the spinning nozzle (3), by use of an air stream.
13. The air spinning machine according to the preceding claim, characterized in that the spinning nozzle (3) has multiple spinning air ducts (9) and multiple piecing air ducts (14) spaced apart therefrom in the transport direction (T), wherein the spinning air inlet openings (10) of the spinning air ducts (9) and the piecing air intake openings (15) of the piecing air ducts (14) are separated from one another by sealing elements (19), preferably in the form of sealing rings.
14. The air spinning machine according to the preceding claim, characterized in that the sealing elements (19) are placed on an outer side (12) of the spinning nozzle (3) and preferably circumferentially enclose the spinning nozzle.
15. The air spinning machine according to Claim 13 or 14, characterized in that the spinning station has a carrier element (21) that accommodates the spinning nozzle (3), wherein the carrier element (21) has a spinning air chamber (22) that is adjacent to the spinning air inlet openings (10) and is in fluid connection with same, wherein the carrier element (21) has a piecing air chamber (23) that adjoins the piecing air intake openings (15) and is in fluid connection with same, and wherein the air chamber and the piecing air chamber are separated from one another in an airtight manner by use of the sealing elements (19) stated in Claims 13 or 14.

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