EP3889327B1 - Spinneret of an air spinning machine - Google Patents

Description

The present invention relates to a workstation of an air-jet spinning machine with a spinneret, the spinneret having a swirl element, the swirl element having a base body and a fiber guide element, and wherein the base body and/or the fiber guide element has a fiber guide channel with an inlet opening and an outlet opening for a fiber structure , wherein the fiber guide channel is designed to guide the fiber structure in a transport direction from the inlet opening to the outlet opening during a spinning process, wherein the fiber guide channel is designed to guide a yarn against the transport direction via the inlet opening out of the spinneret as part of a piecing process, and wherein the The workplace has a buffer to pick up the yarn.

Generic spinnerets with corresponding twist elements are known in the prior art and are used to produce a yarn from an elongated fiber structure with the aid of a vortex air flow generated by air nozzles within a vortex chamber of the spinneret. The outer fibers of the fiber structure are wound around the inner fibers (core fibers) in the area of the inlet opening of the usually spindle-shaped yarn-forming element, so that the result is a yarn which is finally drawn off from the vortex chamber via the discharge channel of the yarn-forming element and with the help of a winding device can be wound onto a tube.

If there is an interruption in the fiber structure feed during yarn production, a yarn break between the spinneret and the winding device or a deliberate interruption of the spinning process because the yarn produced by the spinneret does not meet the specifications, a spinning process is necessary after the interruption.

In this context, it is known that the yarn end, which is located within the spinneret, between the spinneret and the winding device or the yarn spool held there or on the surface of the yarn spool after the yarn production has been interrupted, is returned through the spinneret in the opposite direction to the actual transport direction. The end of the yarn is transported, for example, by an air flow generated within the exhaust duct through the exhaust duct and finally through the inlet opening of the fiber guide element of the spinneret into an area between the spinneret and the drafting system upstream of the spinneret.

In the area between the spinneret and the drafting system, the yarn end is then detected by an operator, a service robot or a device fixed at the workstation and prepared for the subsequent overlap with the fiber structure. Because of the limited installation space between the spinneret and the drafting system, the yarn end is usually deflected essentially perpendicular to the transport direction.

A spinning machine with a corresponding twist device is from the DE 697 07 197 T2 known. The disadvantage of this is that there is an increased risk of yarn damage due to the vertical deflection of the yarn on the twisting device. Furthermore, an increased space requirement between the drafting system and the twisting device is necessary for the deflection of the yarn from the twisting device. Other spinnerets, swirl devices and work stations are, for example, in the EP 3 243 941 A1 , the DE 102 58 719 A1 or the JP H03 89178 U shown.

The object of the present invention is therefore to create a workstation for an air-jet spinning machine which reduces the risk of yarn damage during the spinning process.

The task is solved by a workstation of an air-jet spinning machine with the features of the independent patent claim.

What is proposed is a workstation of an air-jet spinning machine with a spinneret, the spinneret having a swirl element, the swirl element having a base body and a fiber guide element, and wherein the base body and/or the fiber guide element has a fiber guide channel with an inlet opening and an outlet opening for a fiber structure. The fiber guide channel is designed to guide the fiber structure in a transport direction from the inlet opening to the outlet opening during a spinning process. Furthermore, the fiber guide channel is designed to guide a yarn out of the spinneret counter to the transport direction via the inlet opening as part of a spinning process. As part of the spinning process, a yarn is at least temporarily guided out of the spinneret via the inlet opening against the direction of transport. The spinning process here refers to the regular operation of the air-jet spinning machine, i.e. the production of a yarn from the fiber structure using the spinneret. The piecing process, on the other hand, refers to the operation for re-spinning the yarn after an interruption in the spinning process. The workstation also has a buffer for picking up the yarn.

According to the invention, it is now provided that the base body and / or the fiber guide element has at least one curvature at the inlet opening, the intermediate store being designed to gently deflect the yarn in a storage direction via the at least one curvature as part of the spinning process.

Curvature can generally be understood as a curvature of the surface. Using such a curvature, an edge created by two surfaces at an angle to one another can be smoothed. The gentle deflection of the yarn along the curvature has the advantage of reducing the friction between the yarn and the twist element. This also minimizes the risk of yarn damage. In addition, due to the curvature, a constant contact of the yarn on the twist element can be achieved during deflection. This leads to the yarn requiring less space when redirecting.

It is advantageous if the at least one curvature is a curve, in particular with a radius of 0.5 mm to 10 mm. A curve is usually the gentlest way to deflect a yarn, as it involves the least amount of friction and therefore a very low risk of yarn damage.

It is also advantageous if the at least one curvature has a curvature angle of 60° to 180°, advantageously 90° to 120°. The angle of curvature is the angle formed by two straight lines, each of which leads from the center to one of the end points of the curvature. The larger the curvature angle, the longer the curvature and the further the yarn can be deflected.

It is also extremely advantageous if the fiber guide channel has a fiber guide contour with a fiber guide surface and an inlet ramp, as well as a boundary contour opposite the fiber guide contour, the curvature being arranged on the fiber guide surface, the inlet ramp and/or the boundary contour. If the guide contour advantageously has the guide surface for guiding the fiber structure and the inlet ramp for preventing a sliver jam upon entry, the guide surface and the inlet ramp are preferably connected to one another via an inlet edge. It is advantageous here if, when the yarn is deflected in the direction of the fiber guide contour, the at least one curvature is arranged on the leading edge, i.e. between the guide surface and the inlet ramp. If the yarn is deflected in the direction of the boundary contour, the curvature is advantageously arranged on the boundary contour.

It is also advantageous if the fiber guide channel is arranged laterally offset from a longitudinal axis of the spinneret, the contour of the fiber guide channel lying on the outside with respect to the longitudinal axis having the curvature. The longitudinal axis of the spinneret is the axis in which the Yarn is withdrawn from the spinneret. If the base body of the swirl element is rotationally symmetrical, the longitudinal axis of the spinneret is advantageously also the axis of rotation of the swirl element. The external contour can be either the fiber guide contour or the boundary contour of the fiber guide channel. Due to the offset arrangement of the fiber guide channel and the arrangement of the curvature on the external contour, the deflection always takes place in such a way that an unnecessary reversal of direction of the yarn is avoided. This results in particularly gentle guidance of the yarn.

It is also advantageous if the fiber guide element and/or the base body has a fiber guide sleeve at the inlet opening, the curvature being at least partially arranged on or in the area of the fiber guide sleeve.

The fiber guide sleeve can be connected to the fiber guide element and/or the base body in a fixed or detachable manner. This allows the position of the curvature and thus the deflection to be changed. Likewise, the angle of curvature and/or the radius of the curve can be increased by the fiber guide sleeve. This also has the advantage that the fiber guide sleeve and thus the curvature can be removed if necessary.

There are also advantages if the fiber guide sleeve completely encloses the inlet opening of the fiber guide channel. This makes it easier to attach the fiber guide sleeve to the fiber guide element and/or to the base body. In addition, a shift in the curvature can be achieved.

It is also advantageous if the base body and/or the fiber guide element and/or the fiber guide sleeve has a guide groove at the inlet opening, with the curvature being arranged on the guide groove.

The guide groove guides the yarn through the curvature when it is deflected. This prevents the yarn from sliding away from the curvature, particularly laterally. In addition, the guide groove has the advantage that the deflection can be moved in position, in particular closer to the outlet opening of the swirl element.

There are also advantages if the guide groove is V-shaped and opens in the opposite direction to the transport direction. The V-shaped design makes it easier to insert the yarn into the guide groove. In addition, the V-shaped guide groove can be designed in such a way that the yarn is braked by means of contact friction during the piecing process. In this way, the yarn tension can be increased additionally or alternatively.

It is also advantageous if the base body and/or the fiber guide element has a braking section for braking the yarn during the piecing process, the braking section preferably being arranged in the area of the curvature and/or adjacent thereto. A braking section is to be understood as a section in the base body and/or in the fiber guide element, which brakes the yarn through contact friction as part of the spinning process. As part of the piecing process, the yarn is often loaded with a piecing tension by external means, in particular by a drafting system upstream of the twist element, in order to ensure easier piecing. The braking section can increase the piecing tension in addition to or as an alternative to the external means and thereby simplify the piecing process.

It is also advantageous if the braking section is designed in a meandering shape, in particular as a meandering valley at the curvature. A meandering design is understood to mean a series of at least two arches. If the yarn runs within the meandering braking section as part of the piecing process, the yarn undergoes multiple changes of direction during its course. As a meander-shaped valley on the Curvature means a meandering depression at the curvature. This depression can additionally have a valley base radius, which is preferably larger than the yarn radius and in which the yarn runs when deflected. The yarn can be gently deflected using the curvature and gently braked using the meandering braking section, thereby increasing the piecing tension.

The intermediate storage is advantageously a suction unit, which can be delivered to the workstation or is an integral part of it and with the help of which the yarn end can be sucked in in the area of the outlet opening of the swirl element. To prepare the end of the yarn, the intermediate store can additionally have means for preparing the yarn ends.

It is also advantageous if the transport direction forms a deflection angle with the storage direction, with the curvature angle being greater than or equal to the deflection angle. This ensures that the yarn always rests on the curve during the deflection and thus a gentle deflection occurs.

In addition, it is advantageous if the meandering shape of the braking section extends in such a way that the yarn is deflected obliquely to the storage direction within the braking section during the piecing process and is thus braked.

Figur 1

eine schematische Seitenansicht einer Arbeitsstelle einer Luftspinnmaschine während des Spinnvorgangs,

Figur 2

eine schematische Seitenansicht einer Arbeitsstelle einer Luftspinnmaschine ähnlich Figur 1 während des Anspinnvorgangs,

Figur 3a

eine schematische Seitenansicht einer geschnittenen Spinndüse gemäß einem Ausführungsbeispiel,

Figur 3b

eine schematische Seitenansicht einer geschnittenen Spinndüse gemäß einem alternativen Ausführungsbeispiel,

Figur 4a

eine schematische Seitenansicht eines geschnittenen Drallelements gemäß einem weiteren Ausführungsbeispiel,

Figur 4b

eine schematische Vorderansicht des Drallelements gemäß dem Ausführungsbeispiel der Figur 4a,

Figur 5

eine schematische Seitenansicht eines geschnittenen Drallelements gemäß einem weiteren Ausführungsbeispiel, und

Figur 6

einen Schnitt VI des Drallelements aus Figur 4b.

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

Figure 1

a schematic side view of a workstation of an air-jet spinning machine during the spinning process,

Figure 2

a schematic side view of a workstation similar to an air-jet spinning machine Figure 1 during the piecing process,

Figure 3a

a schematic side view of a cut spinneret according to an exemplary embodiment,

Figure 3b

a schematic side view of a cut spinneret according to an alternative embodiment,

Figure 4a

a schematic side view of a sectioned swirl element according to a further exemplary embodiment,

Figure 4b

a schematic front view of the swirl element according to the exemplary embodiment of Figure 4a ,

Figure 5

a schematic side view of a sectioned swirl element according to a further exemplary embodiment, and

Figure 6

a section VI of the swirl element Figure 4b .

Figure 1 shows a schematic side view of a workstation 1 of an air-jet spinning machine during the spinning process, the air-jet spinning machine generally comprising several workstations 1 arranged one behind the other perpendicular to the plane of the drawing and preferably constructed in the same way.

Job 1 has in the in Figure 1 example shown above Drafting system 2, which is supplied in a transport direction T with a fiber structure 3, for example in the form of a doubled stretch band presented in a spinning can, not shown. Furthermore, the work station 1 shown has a spinneret 4 spaced from the drafting system 2 with a swirl element 5. The swirl element 5 has a base body 6 and a fiber guide element 7, wherein the base body 6 and/or the fiber guide element 7 has a fiber guide channel 8 with an inlet opening 9 and an outlet opening 10 for the fiber structure 3. The spinneret 4 is shown in section.

Within a vortex chamber 11, the fiber structure 3 or at least part of the fibers of the fiber structure 3 is provided with a twist in a known manner to produce a yarn 12. The rotation is created by a targeted air flow in the area of the tip of a yarn forming element 13, the air flow being generated by air nozzles 14 which preferably open tangentially into the swirl chamber 11.

The work station 1 shown further comprises a take-off device 15 formed by, for example, a pair of take-off rollers and a winding device 17 which is connected downstream of the take-off roller pair and has a replaceable spool 16. The winding device 17 ultimately serves to wind up the yarn 12 emerging from the spinneret 4 in the transport direction T, which is the Vortex chamber 11 leaves via a discharge channel 18 running within the yarn forming element 13.

In addition, the air-jet spinning machine has a yarn monitoring unit 19, which monitors defined parameters of the yarn 12 (e.g. the yarn thickness, the yarn strength or other parameters representative of the quality of the yarn 12).

If there is an interruption in the fiber structure feed during yarn production, a yarn tear occurs between the spinneret 4 and the Winding device 17 or a desired interruption of the spinning process because the yarn 12 produced by the spinneret 4 does not correspond to the specifications, a spinning process is necessary after the interruption. The interruption occurs by reducing the conveying speeds of the drafting system 2, the take-off device 15 and/or the winding device 17. The reduction does not have to take place simultaneously or continuously. In any case, however, the respective conveying speeds should be throttled in such a way that the stable spinning process collapses when the conveying speeds fall below defined limit values and thus, from a certain point in time, no more yarn 12 is produced from the fiber structure 3. At this point in time there is finally an interruption in yarn production, during which the yarn 12 detaches from the fiber structure 3 without separate force.

The ultimate goal is for a yarn end 20 (see Figure 2 ) after the interruption in an area between the take-off device 15 and the spinneret 4 and is guided from here against the transport direction T through the take-off channel 18 and the fiber guide channel 8 out of the inlet opening 9. It is precisely this point in time during the piecing process of the in Figure 1 The exemplary embodiment shown in the spinning process is in Figure 2 shown.

In the following descriptions of the exemplary embodiments shown in the figures, the same reference numerals are used for features that are identical and/or at least comparable in their design and/or mode of operation compared to the preceding exemplary embodiments. Unless these are explained again in detail, their design and/or mode of operation corresponds to the design and mode of operation of the features already described above.

A buffer 21 arranged at the workstation 1 picks up the yarn end 20 at the inlet opening 9 and deflects the yarn 12 in a storage direction S. Picking up and redirecting is advantageously carried out using negative pressure. To prepare the yarn end 20, the buffer 21 can have means for yarn end preparation. The storage direction S can, as shown in the present exemplary embodiment, run transversely to an axis of rotation D of one of the rollers of the drafting system 2. In the exemplary embodiment shown, the axis of rotation D therefore runs perpendicular to the plane of the sheet. Alternatively, the storage direction S can run parallel or in the direction of the axis of rotation D of one of the rollers of the drafting system 2.

In order to make the deflection as gentle as possible, the spinneret 4 has a swirl element 5, with the help of which the friction between the twist element 5 and the yarn 12 is reduced and there is therefore a very low risk of yarn damage. In the present exemplary embodiment, the base body 6 and the fiber guide element 7 have a curvature 22, in particular a curve with a radius between 0.5 mm and 10 mm, for gently deflecting the yarn 12. This curvature 22 can be arranged in the base body 6, in the fiber guide element 7 or, as shown here, across the base body 6 and in the fiber guide element 7.

The at least one curvature 22 is arranged on the twist element 5 in such a way that the yarn 12 runs over the at least one curvature 22 when it is picked up and deflected in the storage direction S. If the storage direction S, as shown here, runs transversely to the axis of rotation D, the curvature 22 is arranged transversely to the axis of rotation D on the swirl element 5. Alternatively, if the storage direction S runs in the direction of the axis of rotation D, the curvature 22 is arranged on the swirl element 5 in the direction of the axis of rotation D.

The spinning process can then be completed by introducing the yarn end 20 together with the fiber structure 3 into the spinneret 4 and superimposing it in a controlled manner.

Alternatively, it is of course possible to have the deflection and/or the yarn end preparation preceding the piecing process carried out not by the spinning station's own buffer 21, but by an operator manually or by a service robot with a buffer 21, which moves back and forth along a large number of work stations 1 patrolled here.

Figure 3a shows a schematic side view of a sectioned spinneret 4 according to an exemplary embodiment. In contrast to the Figures 1 and 2 For better clarity, only the spinneret 4 and not the entire workstation 1 is shown here. The spinneret 4 from the Figures 1 and 2 However, the exemplary embodiment can be used Figure 3a be replaced. For a clearer representation, the yarn 12 is only indicated as it progresses during the piecing process.

To help with the spinning process, as in Figure 1 shown, to prevent a possible sliver jam, the fiber guide channel 8 has a fiber guide contour 24, advantageously an inlet ramp and an adjoining fiber guide surface. The inlet ramp and the fiber guide surface are connected to one another via an inlet edge 27. The curvature 22 is arranged on the boundary contour 25 of the fiber guide channel 8 opposite the fiber guide contour 24. The curvature 22 extends in contrast to that in the Figures 1 and 2 shown embodiment only in the fiber guide element 7. As an alternative to the embodiment shown here, it is possible that the curvature 22 extends over the base body 6 and / or the fiber guide element 7.

Advantageously, as in the exemplary embodiment shown, the fiber guide channel 8 is arranged laterally offset from a longitudinal axis L of the spinneret 4, with the contour of the spinneret lying on the outside relative to the longitudinal axis L Fiber guide channel 8, which here is the boundary contour 25, has the curvature 22.

In Figure 3b is a schematic side view of a sectioned spinneret 4 shown according to an alternative embodiment. In contrast to the previous exemplary embodiments Figures 1 , 2 and 3a shows the storage directions S in the opposite direction. In addition, two curvatures 22 are arranged here on the fiber guide contour 24, with one of the curvatures 22 being arranged on the leading edge 27. The fiber guide contour 24 is the inner contour of the fiber guide channel 8 relative to the longitudinal axis L. The two curvatures 22 are each designed as a curve with a radius of 0.5 mm to 10 mm. As an alternative to the exemplary embodiment shown here, it is possible for the curvature 22 to be arranged at the inlet opening 9 and/or at the inlet edge 27. Likewise, the exemplary embodiment shown here can be used at the workplace 1 according to Figures 1 and 2 be arranged.

Figure 4a shows a schematic side view of a sectioned swirl element 5 according to a further exemplary embodiment. The Figure 4b shows a schematic front view of the swirl element 5 according to the exemplary embodiment Figure 4a . In contrast to the Figures 1 , 2 , 3a and 3b is in the Figures 4a and 4b For better clarity, only the swirl element 5 and not as in the Figures 1 and 2 the entire workplace 1 or in the Figures 3a and 3b the spinneret 4 is shown. The swirl element 5 from the Figures 1 , 2 , 3a and 3b However, the exemplary embodiment can be used Figures 4a and 4b be replaced. For a clearer representation, the yarn 12 is only indicated as it progresses during the piecing process.

Similar to the exemplary embodiment Figures 1 and 2 the base body 6 and the fiber guide element 7 of the swirl element 5 have an overarching curvature 22. As already described above, the curvature 22 can also be arranged in the base body 6 and/or in the fiber guide element 7. The curvature 22 has a curvature angle K in the range from 60° to 180°, advantageously from 90° to 120°. The curvature angle K is the angle that two straight lines, each of which lead from the center to one of the end points of the curvature 22, span. The larger the curvature angle K, the longer the curvature 22 and the further the yarn 12 can be deflected. This curvature angle K should advantageously, as shown here, be larger than a deflection angle U, which spans between the transport direction T and the storage direction S. As a result, the yarn 12 can always rest on the curvature 22 during the deflection and thus a gentle deflection can take place.

In order to avoid lateral sliding of the yarn 12, a guide groove 23 is arranged at the inlet opening 9 of the swirl element 5. The guide groove 23 can advantageously be V-shaped. The V-shaped design makes it easier to insert the yarn 12 into the guide groove 23 during the piecing process. This guide groove 23 has the additional advantage that the curvature 22 can be moved closer to the outlet opening 10 of the fiber guide channel 8 in the transport direction T. Is the spinneret 4 in a workstation 1, as in the Figures 1 and 2 shown, arranged, the distance from the yarn 12 deflected in the storage direction S to the drafting system 2 can be increased by such a guide groove 23.

In Figure 5 a schematic side view of a sectioned swirl element 5 is shown according to a further exemplary embodiment. Similar to the Figures 4a and 4b For reasons of clarity, only the swirl element 5 is shown here. The swirl element 5 from the Figures 1 , 2 , 3a and 3b However, the exemplary embodiment can be used Figure 5 be replaced. For a clearer representation, the yarn 12 is only indicated as it progresses during the piecing process.

In contrast to the previous figures, the exemplary embodiment in Figure 5 a fiber guide sleeve 26. The fiber guide sleeve 26 is arranged on the fiber guide element 7 and/or on the base body 6 and completely encloses the inlet opening 9 of the fiber guide channel 8. The fiber guide sleeve 26 can be connected to the fiber guide element 7 and/or the base body 6 in a fixed or detachable manner. The curvature 22 is here only arranged on the fiber guide sleeve 26. The curvature 22 has the curvature angle K, which in the present exemplary embodiment, in particular due to the fiber guide sleeve 26, is in the higher range of 60° to 180°. Due to the fiber guide sleeve 26, the curvature 22 can be moved closer to the outlet opening 10 of the fiber guide channel 8 in the transport direction T. By relocating the curvature 22 in this way, the deflection can be designed in such a way that the yarn 12, as shown here, has a very large deflection angle U.

As an alternative to the exemplary embodiment shown here, it is possible for the curvature 22 to extend over the base body 6 and/or the fiber guide element 7. Furthermore, a guide groove 23 similar to the exemplary embodiment could be provided on the fiber guide sleeve 26, on the base body 6 and/or on the fiber guide element 7 Figures 4a and 4b to be available.

Figure 6 shows a section VI of the swirl element 5 Figure 4b . It therefore shows a view from below in the transport direction T of the swirl element 5. In contrast to the Figures 1 , 2 , 3a and 3b is in Figure 6 as well as in the Figures 4a and 4b For better clarity, only the swirl element 5 is shown. The swirl element 5 from the Figures 1 , 2 , 3a and 3b However, the exemplary embodiment can be used Figures 4a, 4b and 6 be replaced. In contrast to the Figures 4a and 4b the yarn 12 is shown as a solid line as part of the piecing process. The yarn 12 is thus at the time shown, as in the Figure 4a shown, deflected in storage direction S.

As in the exemplary embodiment Figures 4a and 4b shown, the guide groove 23 is also V-shaped in FIG. The curvature 22 is arranged at the bottom of the guide groove 23. In contrast to the previous exemplary embodiments, the base body 6 and the fiber guide element 7 have a braking section 28 in the area of the curvature 22. The braking section 28 is introduced into the curvature 22 as a meander-shaped valley. The meandering arcs of the braking section 28 run obliquely to the storage direction S as shown here. As a result, the yarn 12 within the braking section 28 can be deflected obliquely to the storage direction S and braked by means of contact friction on the meandering arcs.

As an alternative to the exemplary embodiment shown here, it is possible for the braking section 28 to extend over the base body 6 and/or the fiber guide element 7 and/or the fiber guide sleeve 26, which is in Figure 5 is shown extends. Furthermore, the braking section 28 could be arranged on the V-shaped guide groove 23, so that the yarn 12 rests on the flanks of the guide groove 23 when it is deflected.

Reference symbol list

1

place of work

2

Drafting system

3

Fiber bandage

4

Spinneret

5

Swirl element

6

Basic body

7

Fiber guide element

8th

Fiber guide channel

9

Entry opening

10

Exit opening

11

Vortex chamber

12

yarn

13

Yarn forming element

14

Air nozzle

15

Trigger device

16

Kitchen sink

17

Winding device

18

Exhaust channel

19

Yarn monitoring unit

20

end of yarn

21

Cache

22

curvature

23

Guide groove

24

Fiber guide contour

25

Boundary contour

26

Fiber guide sleeve

27

leading edge

28

Braking section

T

Transport direction

S

Storage direction

K

Curvature clamping angle

U

deflection angle

L

Longitudinal axis

D

Axis of rotation

Claims (14)

1. A workstation (1) of an air-jet spinning machine having a spinning nozzle (4), wherein the spinning nozzle (4) comprises a twist element (5),

   - wherein the twist element (5) comprises a base body (6) and a fiber guide element (7), and

   - wherein the base body (6) and/or the fiber guide element (7) comprise a fiber guide channel (8) having an inlet opening (9) and an outlet opening (10) for a fiber strand (3),

   - wherein the fiber guide channel (8) being implemented for guiding the fiber strand (3) in a transport direction (T) from the inlet opening (9) to the outlet opening (10) during a spinning process, and

   - the fiber guide channel (8) being implemented for guiding a yarn (12) opposite the transport direction (T) through the inlet opening (9) out of the spinning nozzle (4) during a piecing process,

   - the workstation (1) having an intermediate storage (21) being implemented for picking up the yarn (12),

   characterized in that
   the base body (6) and/or the fiber guide element (7) comprises at least one curve (22) at the inlet opening (9), wherein the intermediate storage (21) being implemented for gently deflecting the yarn (12) during the piecing process in a storage direction (S) via the at least one curve (22).
2. The workstation (1) according to the preceding claim, characterized in that the at least one curve (22) is a rounding, particularly having a radius from 0.5 mm to 10 mm.
3. The workstation (1) according to any one of the preceding claims, characterized in that the at least one curve (22) comprises a curve angle (K) from 60° to 180°, advantageously from 90° to 120°, wherein two straights, each leading from the center point to one of the end points of the curve (22), span the curve angle (K).
4. The workstation (1) according to any one of the preceding claims, characterized in that the fiber guide channel (8) comprises a fiber guide contour (24) having a fiber guide surface and an inlet ramp and a bounding contour (25) opposite the fiber guide contour (24), wherein the curve (22) is disposed at the fiber guide surface, the inlet ramp, and/or the bounding contour (25).
5. The workstation (1) according to claim 4, characterized in that the fiber guide channel (8) is laterally offset from a longitudinal axis (L) of the spinning nozzle (4), wherein the outer contour (24, 25) of the fiber guide channel (8) relative to the longitudinal axis (L) comprises the curve (22).
6. The workstation (1) according to any one of the preceding claims, characterized in that the fiber guide element (7) and/or the base body (6) comprises a fiber guide sleeve (26) at the inlet opening (9), wherein the curve (22) is disposed at least partially at the fiber guide sleeve (26).
7. The workstation (1) according to claim 6, characterized in that the fiber guide sleeve (26) completely encloses the inlet opening (9) of the fiber guide channel (8).
8. The workstation (1) according to any one of the claims 6 or 7, characterized in that the fiber guide sleeve (26) comprises a guide groove (23) at the inlet opening (9), wherein the curve (22) is disposed in the region of the guide groove (23).
9. The workstation (1) according to any one of the preceding claims, characterized in that the base body (6) and/or the fiber guide element (7) comprises a guide groove (23) at the inlet opening (9), wherein the curve (22) is disposed in the region of the guide groove (23).
10. The workstation (1) according to any one of the claims 8 or 9, characterized in that the guide groove (23) is implemented as a V-shape opening opposite the transport direction (T).
11. The workstation (1) according to any one of the preceding claims, characterized in that the base body (6) and/or the fiber guide element (7) comprises a braking segment (28) for braking the yarn (12) during the piecing process by contact friction, wherein the braking segment (28) is preferably disposed in the region of the curve (22) and/or connected thereto.
12. The workstation (1) according to claim 11, characterized in that the braking segment (28) is implemented having a meandering shape, particularly as a meandering valley on the curve (22).
13. The workstation (1) according to claim 3, characterized in that the transport direction (T) and the storage direction (S) span an angle of deflection (U), wherein the curve angle (K) is greater than or equal to the angle of deflection (U).
14. The workstation (1) according to claim 12, characterized in that the meandering shape of the braking segment (28) extends such that the yarn (12) is deflected at an angle to the storage direction (S) within the braking segment (28) during the piecing process and is thus braked.

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