WO2020165044A1

WO2020165044A1 - Spinneret for an air jet spinning machine and method for opening such a spinneret

Info

Publication number: WO2020165044A1
Application number: PCT/EP2020/053146
Authority: WO
Inventors: Alexander Fuchs; Simon-Moritz Funke; Gernot Schaeffler; Gerd Stahlecker
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2019-02-11
Filing date: 2020-02-07
Publication date: 2020-08-20
Also published as: CN113439134A; DE102019103271A1

Abstract

The invention relates to a spinneret (1) for an air jet spinning machine. The spinneret (1) is designed to produce a yarn (2) from a sliver (3) supplied to the spinneret (1) in a spinning operation, wherein the spinneret (1) comprises a housing (4) with an inlet opening (5) via which the sliver (3) can be introduced into the spinneret (1) during a spinning operation, and the spinneret (1) comprises an inner vortex chamber (6). The spinneret (1) has a yarn forming element (7) which protrudes into the vortex chamber (6), said yarn forming element comprising an inlet (8) arranged within the vortex chamber (6) for the yarn (2) formed in the vortex chamber (6) from the sliver (3), a drawing channel (9) which adjoins the inlet (8), and an outlet (10) which forms the end of the drawing channel (9) and via which the yarn (2) can be drawn out of the spinneret (1) during a spinning operation. The invention is characterized in that the spinneret (1) is designed to be separable into at least two spinneret sections (12) along a separating surface (11), said extraction channel (9) lying in the separating surface (11) and being delimited by both spinneret sections (12) during a spinning operation.

Description

Spinneret for an air-jet spinning machine and a method for opening such a

The present invention relates to a spinneret for an air-jet spinning machine, the spinneret being designed to produce a yarn from a fiber structure fed to the spinneret in a spinning operation, the spinneret comprising a housing with an inlet opening through which the fiber structure enters the spinning nozzle in the spinning operation is insertable, wherein the spinning nozzle comprises an internal vortex chamber, the spinneret having a yarn-forming element protruding into the vortex chamber, which has an inlet for the yarn formed from the fiber structure in the vortex chamber, a discharge duct which is connected to the inlet and one of the end of the draw-off channel comprises the outlet via which the yarn can be drawn off from the spinneret during the spinning operation.

The invention also relates to a yarn forming element for a spinneret ei ner air-jet spinning machine, the yarn forming element comprising an inlet for a yarn, a take-off channel adjoining the inlet and an outlet which forms the end of the take-off channel and via which the yarn can be pulled out of the yarn forming element.

Furthermore, a spinning station of an air-jet spinning machine with a spinning nozzle is described.

Finally, a method for opening a spinneret of an air-jet spinning machine with a take-off channel for a yarn produced with the aid of the spinneret from a fiber structure and a method for piecing a spinning nozzle of an air-jet spinning machine are the subject of the present invention. Generic spinnerets are used to produce a yarn from an elongated fiber structure with the aid of a vortex air flow generated by corresponding air nozzles in within the 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 of the usually spindle-shaped yarn formation element, so that the result is a yarn that is finally drawn off the swirl chamber via the take-off channel of the yarn formation element and with the help of a Spooling device can be wound onto a tube.

In order to be able to clean the inside of the spinneret, in particular the yarn forming element, manually or with the help of automatic handling devices after a stop in yarn production, there are already proposals to design the housing of the spinneret surrounding the swirl chamber in more parts. The individual housing sections are mounted so that they can move relative to one another, so that the housing can be opened by moving one or more housing sections. After opening, the interior of the spinneret is accessible and can be freed from deposits (avivage, honeydew, etc.).

Various opening mechanisms are already known (see, for example, EP 2 573 220 A2 or DE 10 2015 100 825 A1).

It is also known to thread a previously spun yarn through the take-off channel and then through the inlet opening of the housing against the direction of transport of the yarn prevailing during yarn production and to combine it with a fiber structure supplied by a drafting device in front of the spinneret, seen in the transport direction. The spinning operation is then resumed, the fiber composite entering the spinneret and the vortex generated within the vortex chamber being exposed to airflow. In order to simplify the mentioned return of the yarn through the relatively thin take-off channel and the inlet opening of the housing, it has already been proposed to equip the yarn formation element with an injection nozzle through which air can be introduced into the take-off channel against said transport direction during the return of the yarn. This creates an air flow which sucks the yarn end into the take-off channel and moves it towards the inlet opening of the housing.

The object of the present invention is to propose a spinneret of an air-jet spinning machine, a yarn formation element for a spinneret, a spinning station with a corresponding spinneret and a method for opening or spinning a spinneret that are useful both in terms of cleaning the interior of the spinneret or the take-off channel as well as with regard to the piecing process described, in which the yarn was previously guided through the spinneret against the transport direction, differ positively from the prior art.

The object is achieved by a spinneret of an air-jet spinning machine, a yarn formation element for a spinneret, a spinning station with a corre sponding spinneret and a method for opening or piecing a spinneret with the features of the independent claims.

The spinning nozzle according to the invention has a housing with an inlet opening via which a fiber structure can be introduced into the spinning nozzle in a predetermined transport direction during the spinning operation. Furthermore, the spinning nozzle comprises an internal swirl chamber and a yarn forming element ra lowing into the swirl chamber. The yarn forming element has an inlet arranged inside the swirl chamber for the yarn formed in the swirl chamber from the fiber structure, a draw-off channel adjoining the inlet and an outlet that forms the end of the draw-off channel, via which the yarn can be drawn out of the spinning nozzle during spinning. In order to simplify the return of a yarn end during a piecing process through the spinneret and also the cleaning of the same, it is proposed according to the invention that the spinneret be designed to be divisible into two spinneret sections along a separating surface, the draw-off channel being in the separating surface and the spinning operation of both spinning nozzle sections is limited.

The spinneret can therefore be divided into at least two sections outside of the spinning operation, the division along a parting surface that runs through the draw-off channel during the spinning operation. The separating surface here runs through a longitudinal axis of the exhaust duct, which extends in the aforementioned transport direction. The exhaust duct preferably has an axis of symmetry which lies in the separating surface.

If the spinneret is now divided by moving at least two sections of the same apart, the draw-off channel is also opened along its longitudinal axis and is accessible from the outside after the division. On the one hand, this enables the exhaust duct to be cleaned. Likewise, a yarn end can simply be inserted into the take-off channel or one of several take-off channel sections after dividing the spinneret. If the spinneret is then closed again, i.e. If the individual spinneret sections are reunited to form a spinneret, the yarn section is inevitably located within the draw-off duct and therefore no longer has to be threaded through it during the piecing process.

As a result, the invention particularly provides that the spinneret has a parting surface which runs through the spinning nozzle when the spinneret is in spinning operation, ie when the spinneret is not split, the withdrawal channel lying completely in the parting surface. The separating surface is preferably flat. Alternatively, the spinneret can also be arched interface be divisible. Finally, it is conceivable that the separating surface has a plurality of sections that are offset or inclined to one another.

For example, the spinneret could be divisible in a ratio of 1/3 to 2/3 or 1/4 to 3/4. The spinneret can also be divisible into more than two, for example three or four, spinneret sections. In other words: the term divisible does not necessarily mean that the spinneret can be divided into only two spinneret sections or into spinneret sections of the same size.

In any case, it is preferred if the separating surface runs between two planes which are parallel to one another and are of flat design, the distance between the two planes being between 0.1 mm and 5 mm.

Furthermore, it should be pointed out that the term divisible does not necessarily mean that the spinneret can be separated into two spinneret sections. Rather, there can also be more than two spinneret sections which together form the spinneret in the spinning operation.

It should also be pointed out that the individual spinneret sections preferably each comprise part of the yarn-forming element and part of the housing.

It also has advantages if the draw-off channel can be separated by dividing the spinneret along the separating surface into two at least partially channel-shaped draw-off channel sections. In addition or as an alternative to this, the extraction channel can have a rotationally symmetrical inner surface, although this is not absolutely necessary. If the spinneret is divided along the parting surface, the exhaust duct is also completely divided into two exhaust duct sections, which in turn have the shape of a channel. The separating surface preferably represents a plane of symmetry of the flue.

It is also advantageous if the spinneret sections can be pivoted relative to one another via a pivot axis of the spinneret. The pivot axis is preferably parallel to the longitudinal axis of the flue. In particular, it is advantageous if the pivot axis lies in the separating surface or runs parallel to it.

The pivot axis is formed, for example, by a joint. The joint in turn comprises individual joint sections, each joint section being connected to one of the spinneret sections, in particular to the individual sections of the housing. The hinge sections can in turn be connected to one another via a hinge pin and can thereby be moved relative to one another.

It is also conceivable that the spinneret sections can be displaced relative to one another via a curved or linear guide of the spinneret. For example, the individual housing sections could each have a guided section that interacts with the guide. It is also conceivable that the guide is rigidly connected to one of the housing sections, the further housing section or sections being movable relative to the guide.

Furthermore, it is advantageous if at least one of the two spinneret sections has a seal which is located between the two spinneret sections during the spinning operation of the spinneret and at least partially seals the vortex chamber to the outside. The seal can be present, for example, as a sealing cord, which preferably runs in a groove in a housing section. The one in the closed state of the spinneret Further housing section resting on the sealing cord can be flat in the area of the seal or can also have a groove.

The respective seal, of which there can also be several, preferably extends from a first end face of the spinneret, which comprises the inlet opening, to a second end face of the spinneret, which comprises the outlet of the yarn forming element. The outlet of the yarn-forming element also preferably forms the spinneret outlet via which the yarn leaves the spinneret. In particular, there should be at least two seals in the case of two housing sections, both seals being able to lie in the separating surface when the spinneret is closed. In addition, the swirl chamber and thus also the yarn forming element should be located in a cross section along the separating surface between the two seals, so that it is sealed off from the outside.

It also brings advantages if the yarn-forming element is designed to be divisible into two sections along the separating surface, each section being part of a respective spinneret section. The parting surface not only divides the take-off channel, but the entire Garnbildungsele element. The separating surface preferably divides the yarn-forming element into two axially symmetrical sections, the axis of symmetry being formed by the longitudinal axis of the take-off channel.

In particular, it is advantageous if the two sections of the Garnbil formation element are identical, since this reduces the manufacturing costs of the Garnbil element.

It is also extremely advantageous if the two sections of the yarn formation element are arranged offset from one another in the spinning operation with respect to the separating surface such that one or more steps are present in the area of an outer surface of the yarn formation element. In addition, should (n) the step (s) can be designed to be sloping in a predetermined direction of rotation of a vortex air flow introduced into the vortex chamber during the spinning operation via air nozzles of the spinning nozzle. For example, it would be conceivable that the yarn-forming element is formed by the above-mentioned two sections, with both sections having a common connecting plane which in turn is congruent with the parting surface.

If the fibers are now moved over the outer surface of the yarn formation element in the production of the yarn from the fiber structure in the area of the inlet of the yarn formation element, the steps ensure that the fibers of the fiber structure do not get between the two sections of the yarn formation element or the bumper edge caught between the two sections. Rather, they slide over the steps that are formed sloping in the direction of movement of the fibers.

As an alternative or in addition to this, it can furthermore be advantageous if corresponding steps are also present in the region of an inner surface of the yarn forming element that borders the draw-off duct inwardly. Here, too, the steps should be designed to be sloping in the direction of rotation of the yarn moving through the take-off channel in order to avoid the fibers getting caught between the sections of the yarn-forming element.

In other words, it is advantageous if steps are present both in the area of the outer surface of the yarn forming element, preferably in the area of its inlet, and also in the area of the inner surface of the yarn forming element, which are formed by mutual overlapping of the two sections of the yarn forming element are. The steps are designed in relation to a longitudinal axis of the haul-off channel in such a way that the radial distance between the longitudinal axis of the haul-off channel and the outer surface of the yarn-forming element is reduced in a predetermined circumferential direction of the yarn-forming element in the region of the parting line. In the same Chen circumferential direction should increase the radial distance between the named longitudinal axis and the inner surface of the flue in the area of the separation surface.

It is particularly advantageous if the inlet opening of the spinneret is formed by a fiber guide element, the fiber guide element being designed to be divisible into two individual sections along the separation surface. In the non-split state of the spinneret, the individual sections form a channel section through which the fibers are guided perpendicular to their transport direction when they enter the spinneret. In order to be able to easily guide a yarn through the spinneret during a piecing process against the transport direction, the aforementioned divisibility of the fiber guide element is advantageous. If the spinneret is divided, the two individual sections of the fiber guide element also move apart, so that a returned yarn can be inserted between the two individual sections. If the spinneret is then closed again, the yarn automatically runs through the inlet opening of the spinneret, i.e. it is surrounded on all sides by the fiber guide element. Each individual section should be part of a spinneret section.

Furthermore, it is advantageous if the housing is designed to be divisible into two housing sections along the separating surface, each housing section being part of a respective spinneret section. The housing includes the outer surface of the spinneret that is visible from the outside and delimits the swirl chamber on the inside. In addition, a section of the yarn-forming element and an individual section of the fiber guide element should each be connected to a housing section. The connection can take place here, for example, via a form fit or a force fit.

It is also conceivable that one or more sections of the Garnbildungsele element, one or more housing sections or one or more individual sections of the fiber guide element has one or more magnets that hold the corresponding components in the spinning position aneinan.

It is also advantageous if the fiber guide element has a guide section for guiding the fiber structure entering the spinneret, the guide section being part of one of the two spinning nozzle sections and being cut by the separating surface during the spinning operation. The guide section is preferably a surface which laterally deflects the fiber structure entering the spinneret relative to the transport direction. This creates a twist stop which prevents the twist of the fiber structure generated inside the spinneret by the fluidizing air flow from being propagated outside the spinneret, counter to the transport direction. In order to prevent the fibers of the fiber structure from getting caught on a contact surface of the two individual sections of the fiber guide element, it is advantageous if the guide section is formed entirely by one of the individual sections. The individual sections of the fiber guiding element are therefore preferably neither identical nor symmetrical with respect to the separating surface.

It is also advantageous if at least one of the two spinneret sections has at least one centering element, with the help of which it is ensured that the two spinneret sections assume a defined relative position to one another during spinning. The centering element can be, for example, a bulge that is part of a spinning nozzle section and, in spinning operation, interacts with a recess in the second spinning nozzle section, which also acts as a centering element. In particular, it is advantageous if both spinneret sections each Weil have one or more centering elements, half of the centering elements being designed as centering cones and the second half of the centering elements as indentations into which the centering cones engage in spinning operation. Additionally or alternatively, it can also be advantageous if at least one of the sections of the yarn-forming element and / or at least one of the individual sections of the fiber guiding element has one or more centering elements. Preferably, both sections of the yarn formation element and / or both individual sections of the fiber guiding element each have one or more centering elements.

The present invention further comprises a yarn formation element for a spinneret of an air-jet spinning machine, the yarn formation element comprising an inlet for a yarn, a withdrawal channel adjoining the inlet and an outlet which forms the end of the withdrawal channel and via which the yarn can be withdrawn from the yarn formation element. The Garnbil formation element is characterized in that it is designed to be divisible into two sections along a separating surface, the withdrawal channel being located in the separating surface. The two sections are preferably identical or are axially symmetrical with respect to a longitudinal axis of the exhaust duct. It is also advantageous if the yarn-forming element has one or more of the features described above or below.

In any case it is envisaged that the interface extends through the entire flue, i. extends from the inlet to the end thereof and thus to the outlet of the yarn forming element. This ensures that the take-off channel sections are completely exposed when the yarn-forming element is divided into its individual sections and are therefore accessible from the outside.

In addition, a spinning station of an air-jet spinning machine is proposed. The spinning station preferably comprises a drafting device known from the prior art with a plurality of drafting device rollers which are each rotatable about an axis of rotation. With the help of the drafting system, a guided fiber structure stretched and thus evened out before the fiber structure is introduced into the spinneret. The actual yarn production takes place in the spinneret, in that the fiber structure is subjected to a vortex air flow within the vortex chamber of the spinneret. Here through the outer fibers of the fiber composite are looped around an inner lying lowing fiber core. The yarn produced in this way is finally withdrawn from the spinning nozzle via the withdrawal channel of the yarn forming element and then played onto a sleeve of a winding section of the spinning station.

The spinneret has the separating surface described so far or below, so that the spinneret can be divided into two spinneret sections which can be moved apart by dividing or pivoted relative to one another. The spinneret also has one or more of the features disclosed above and / or below.

It is advantageous if at least one axis of rotation lies in the separating surface of the spinneret or runs parallel to the separating surface. Alternatively, it is also conceivable that at least one of the axes of rotation is oriented at right angles or at an angle to the trend plane.

Furthermore, it is advantageous if the spinneret has a pivot axis or a guide described above, a first spinneret section being rigidly fixed to a holding section of the spinning station and the second spinneret section pivotable relative to the first spinneret section with the help of the pivot axis and / or the guide and / or is displaceable. The rigidly fixed spinneret section thus always has a fixed, predetermined position in space both in the spinning position and after the division of the two spinneret sections. This ensures that the spinning nozzle as a whole always has a known spatial orientation in the spinning position, so that reproducible yarn production is ensured. Finally, the present invention relates to a method for opening a spinning nozzle of an air-jet spinning machine with a take-off channel for a yarn produced from a fiber structure with the aid of the spinning nozzle. In particular, the spinneret is designed as described above or below. According to the invention it is provided that the spinneret is divided into two spinneret sections along the already described parting surface, the discharge channel being located in the parting surface.

The spinneret is preferably opened by pivoting a spinneret section relative to a second spinneret section rigidly fixed to a holding section of the spinning station or by moving it away from the second spinneret section on a straight or curved guide path. Alternatively, it is also possible that the spinneret is integrated into the spinning station and attached to a holding structure in such a way that when the spinneret is opened, both spinneret sections are pivoted or moved relative to the holding structure.

In particular, when opening the spinneret, both two housing sections of the spinneret and two sections of the yarn forming element and two individual sections of the fiber guide element of the spinneret should be moved relative to one another.

By opening the spinneret, ie by dividing and separating the two spinneret sections, the interior of the spinneret is accessible for cleaning purposes. It is also possible in a simple manner to insert a yarn into one of the two take-off channel sections as part of a piecing process, so that a complex threading process of the yarn through the take-off channel known from the prior art is dispensed with. Finally, the present invention comprises a method for piecing a spinning nozzle of an air-jet spinning machine, the spinning nozzle preferably being designed according to the previous or following description.

If the yarn production is interrupted, a yarn end is created on the spool-side (i.e. a yarn end of the yarn that has already been wound onto a tube to form a spool). In a subsequent piecing process, this yarn end must be brought into contact again with the fiber structure supplied by the drafting system in order to be able to resume the spinning process.

For this purpose, it was previously necessary to thread the end of the yarn through the take-off channel and then through the inlet opening of the spinneret, counter to the direction of transport prevailing in the spinning operation. However, this Fädelvor gang is technically complex and not always reliably feasible.

In order to counter this disadvantage, it is now proposed according to the invention that the spinneret is divided into two spinneret sections along a separating surface after the interruption of a spinning operation. The parting surface here runs both through the yarn forming element and through the take-off channel as well as through the inlet opening of the spinneret. In particular, the flue duct lies completely in the separating surface.

The yarn coming from the yarn bobbin is then inserted between the two spinneret sections, the yarn preferably being in contact only with sections of one of the two spinneret sections after it has been introduced. In particular, the yarn should be inserted in such a way that it runs within a draw-off channel section before the spinneret sections are closed. The two spinneret sections are then brought together again, the yarn after being brought together extending through an inlet opening into a swirl chamber of the spinneret and from there through an outlet duct of the yarn forming element of the spinneret. Finally, the yarn end protruding from the inlet opening is brought into contact with a fiber composite.

The spinning operation is then resumed, the previously stopped drafting system being activated again and the yarn protruding from the spinneret via the outlet of the yarn-forming element being rewound onto the tube.

In the prior art, it has been customary up to now for a yarn end to be threaded through the take-off channel and the inlet opening of the spinneret against the transport direction when the spinneret is closed. In contrast to this, the present invention now provides that the spinneret is first opened by moving two spinneret sections relative to one another in such a way that the vent is divided into two vent sections, both vent sections being accessible from the outside after the spinneret has been opened .

Likewise, the section of the spinneret which comprises the inlet opening of the spinning nozzle is divided into two sections when the spinneret is opened. In particular, two sections of a fiber guide element forming the inlet opening are moved apart. Subsequently, a yarn end is placed between the two spinneret sections and the spinneret sections are then moved towards one another or connected to one another again. As a result, the spinneret resumes its closed shape and position, which it had before the spinneret was opened. The spinning operation can then be resumed. It is also advantageous if at least one of the spinneret sections when brought together has a movement component which runs parallel to the parting surface. The two spinneret sections are therefore preferably not moved towards one another in a linear movement when the spinneret is closed. Rather, it is advantageous if at least one spinning nozzle section is moved on a curved path or by a pivoting movement.

In particular, it has proven to be advantageous if a spinneret section is pivoted to a second spinneret section, the pivot axis extending outside the parting surface.

Further advantages of the invention are described in the following Ausführungsbei play. They show, each schematically:

FIG. 1 selected sections of a spinning station of an air-jet spinning machine,

Figure 2 is a plan view of a spinneret according to the invention,

Figure 3 is a front view of a further embodiment of an inven

proper spinneret with different positions of the left housing section,

FIG. 4 shows a spinneret section of a spinning nozzle according to the invention,

Figure 5 is a perspective of a housing of an inventive

Spinneret with fiber guide element in closed (Figure 5a) and open (Figure 5b) position, FIG. 6 shows two sections of a yarn formation element according to the invention,

Figure 7a is a plan view of a yarn formation element according to the invention,

FIG. 7b shows a side view of a yarn forming element according to the invention, and

Figure 8 is a plan view of a further yarn formation element according to the invention.

Figure 1 shows selected sections of a spinning station of an air-jet spinning machine.

The spinning station comprises a drafting device 27 with several drafting device rollers 29, which are each driven about an axis of rotation 28 (the drive is not shown). As a result of different speeds of the drafting device rollers 29, there is a distortion and thus an equalization of a fiber strand 3 passing through the drafting device 27.

After passing through the drafting system 27, the fiber structure 3 is introduced into a spinneret 1 via an inlet opening 5, in which the fiber structure 3 is subjected to a vortex air flow. As a result, the outer fibers of the fiber bandage 3 are looped around the inner core fibers of the fiber bandage 3, so that a yarn 2 is created with a real twist. The yarn 2 finally leaves the spinneret 1 via the outlet 10 of a yarn-forming element 7 arranged within the spinneret 1 and can then be played onto a tube so that a bobbin 31 is produced. If a yarn break or any other interruption in yarn production occurs during the spinning operation, the yarn 2 detaches from the fiber structure 3, so that a yarn end is created. In a subsequent spinning process, this end of the yarn must be brought into contact with the fiber structure 3 so that it can then be re-introduced into the spinneret 1 together with the fiber structure 3.

In this case, it has hitherto been customary for the end of the yarn, starting from the yarn bobbin 31, to thread through the spinning nozzle 1 and between the spinning nozzle 1 and the drafting device 27 and / or the prevailing transport direction during the spinning operation (transport direction: from left to right in FIG. to be superimposed with the fiber structure 3 within the drafting system 27. However, this is technically quite complex and error-prone.

The present invention therefore proposes an alternative possibility which makes the mentioned threading process superfluous.

As can be seen from FIG. 2, the spinneret 1 according to the invention now comprises at least two spinneret sections 12 which, during the spinning operation, bear against one another along a separating surface 11.

The spinneret 1 is now made divisible along the parting surface 11, i. E. both spinneret sections 12 are movable relative to one another.

FIG. 2 shows a solution in which the two spinneret sections 12 are connected to a guide 15 via a guided section 32 each. The two spinneret sections 12 can be moved apart along the guide 15 in the direction of the two arrows shown. This opens the spinneret 1. The separating surface 11 runs both through the inlet opening 5 of the spinneret 1 and its outlet opening, which is formed by an outlet 10 of the yarn formation element 7, which will be explained in more detail below. As an alternative to the solution shown, it would of course also be conceivable that a spinneret section 12 is rigidly connected to the guide 15 or a holding section 30 of the spinning station, so that only one of the two spinneret sections 12 is movably supported. In any case, the two spinneret sections 12 can be moved relative to one another, whereby the spinneret 1 can be opened in a simple manner. After opening the spinneret 1, the yarn 2 can finally be inserted between the two spinning nozzle sections 12. If the two spinneret sections 12 are finally brought together again, the yarn 2 extends through the spinneret 1 without a threading process being necessary for this.

FIG. 3 shows an alternative possibility. Here, too, the spinneret 1 has a separating surface 11 which runs through the inlet opening 5 of the spinneret 1 and also the outlet 10 of the yarn forming element 7. In contrast to FIG. 2, the two spinneret sections 12 are connected via a joint 33, so that the two spinneret sections 12 can be pivoted relative to one another about a pivot axis 14. In this case, too, it would be conceivable that one of the two spinneret sections 12 is rigidly connected to a holding section 30, so that only the second spinneret section 12 is pivotably mounted.

Moreover, the figures shown so far also show that the spinneret 1 in principle has a housing 4, the housing 4 comprising at least two housing sections 24, each of which can be moved relative to one another as part of a spinneret section 12.

One of two spinneret sections 12 is now shown in FIG. The spinneret section 12 basically comprises a housing section 24 as well as an individual section 23 of a fiber guide element 22, which is likewise designed to be divisible, and which guides the one entering the spinneret 1 Fiber bandage 3 is used. At the same time, the fiber guide element 22 forms the inlet opening 5 of the spinneret 1.

Furthermore, FIG. 4 shows that one half of the swirl chamber 6 is arranged within the spinneret section 12, in which half of the air introduced via air nozzles 21 of the spinneret 1 during the spinning operation generates a swirl air flow. This vortex air flow causes the desired Umschlin supply of the core fibers of the imported fiber composite 3 by the same outer lying fibers. The yarn 2 thus formed enters the withdrawal channel 9 via an inlet 8 of the yarn formation element 7 or is only formed in the area of the inlet and is finally withdrawn from the spinneret 1 via the outlet 10 of the yarn formation element 7.

The spinneret section 12 shown naturally comprises only one draw-off channel section 13, since the separating surface 11 runs through the draw-off channel 9 and also divides it into two sections. By dividing the spinneret 1, an inner surface 19 of the draw-off channel becomes accessible from the outside.

The same applies to the yarn forming element 7, which can also be divided into two sections 17 along the separating surface 11. The spinneret section 12 according to FIG. 4 thus also contains only a section of the yarn forming element 7.

In principle, the spinneret section 12 shown in FIG. 4 thus forms one half of the spinneret 1, the spinneret section 12 not only including a section 17 of the yarn forming element 7 but also an individual section 23 of the fiber guiding element 22.

Both spinneret sections 12 of a spinneret 1, only one of which is shown in FIG. 4, are of essentially identical design. In order to ensure that the vortex chamber 6 is sealed to the outside during operation of the undeteil th spinneret 1, at least one of the two spinneret sections 12 has one or more seals 16. In the example shown, there are two seals 16, which can be formed, for example, by a sealing cord. If both spinning nozzle sections 12 are now moved towards each other again after splitting and are brought into contact along the separating surface 11, the device 16 ensures that no air escapes laterally to the outside between the two housing sections 24.

Finally, FIG. 4 shows that the spinneret 1 preferably has a suction opening 34 via which air, which is introduced via the air nozzles 21, can be discharged during operation of the spinneret 1. Preferably, the suction opening 34 is part of exclusively a spinneret section 12 and lies outside the separating surface 11, so that no seal is necessary here.

Figures 5a (closed spinneret 1) and 5b (open spinneret 1) now show a further advantageous feature of a spinneret 1 according to the invention, only the two housing sections 24 and the individual sections 23 of the fiber guide element 22 being shown.

The separating surface 11 extends through the fiber guide element 22. However, this has a guide section 25 for the fiber structure 3, which is formed in one piece. This has the advantage that the fibers of the fiber structure 3 cannot get caught or get caught in a parting line of the guide section 25 when the fiber structure 3 is drawn into the spinneret 1 during the spinning operation.

FIG. 6 shows the two sections 17 of a yarn forming element 7, which form the yarn forming element 7 after being brought together.

To ensure that the mutual alignment of both sections 17 During the spinning operation always complies with the specifications, both sections 17 have several centering elements 26, with part of the Zentrierele elements 26 being formed as protruding centering cones and another part as recesses protruding into the sections 17 of the yarn forming element 7. If the two sections 17 of the yarn forming element 7 are joined together, the centering cones engage in the depressions and cause a correct mutual alignment of the two sections of the yarn forming element 7 (for reasons of clarity, only some of the centering elements 26 are provided with a reference number).

A further advantageous embodiment of a yarn formation element 7 according to the invention is shown in FIGS. 7a (top view) and 7b (side view).

As already mentioned, the outer fibers of the fiber composite 3 are looped around the inner core fibers during yarn production. Here, the outer fibers move in the direction of the arrow shown in FIG. 7a in a circular motion around the outer surface 18 of the yarn forming element 7. At the same time, there is contact between the outer fibers and the inner surface 19 of the take-off duct 9.

If the take-off channel 9 now consists of two take-off channels 13, as provided, which rest against one another during the spinning operation, there is a risk that fibers will become entangled in the contact area between the two sections 17.

In order to counter this risk, it is advantageous if the two sections 17 of the yarn forming element 7 overlap in such a way that steps 20 arise at least in the area of the inlet 8. The steps 20 are designed in such a way that the fibers of the fiber structure 3 or of the yarn 2 exist during the movement along the outer surface 18 of the Garnbildungsele element 7 or the inner surface 19 of the take-off channel 9 are guided over falling steps 20. So to a certain extent, levels 20 have a spoiler effect and prevent the fibers from getting caught or arrested in the area of the separating surface 11.

Finally, FIG. 8 shows a further possible feature of a yarn-forming element 7 according to the invention. As can be seen from the comparison of the cited figure with FIG. 7a, steps 20 are also present in the embodiment shown in FIG. 8 in order to prevent damage to the fibers passing through. In addition, however, the two sections 17 of the yarn forming element 7 engage one another (see the dashed lines).

In this case, the separating surface 11 is not flat, but comprises three sections running parallel to one another.

The interlocking can be designed such that corresponding step sections are also formed in the area immediately surrounding the inlet 8 of the yarn forming element 7.

The present invention is not restricted to the illustrated and described exemplary embodiments. Modifications within the scope of the claims are just as possible as any combination of the features described, even if they are presented and described in different parts of the description or the claims or in different exemplary embodiments, provided that there is no contradiction to the teaching of the independent claims arises.

Reference list

Spinneret

yarn

Fiber bandage

casing

Inlet opening

Vortex chamber

Yarn forming element

Inlet of the yarn forming element

Exhaust duct

Outlet of the yarn forming element

Parting surface

Spinneret section

Flue section

Swivel axis

guide

poetry

Section of the yarn forming element

Outer surface of the yarn formation element Inner surface of the take-off channel

step

Air nozzle

Fiber guide element

Individual section of the fiber guide element housing section

Guide section of the fiber guide element centering element

Drafting system

Axis of rotation

Drafting roller Holding section thread spool guided section joint

Suction opening

Claims

Patent claims

1. Spinning nozzle (1) for an air-jet spinning machine, the spinning nozzle (1) being designed to produce a yarn (2) from a fiber structure (3) fed to the spinning nozzle (1) in a spinning operation, the spinning nozzle (1) having a housing ( 4) with an inlet opening (5) through which the fiber structure (3) can be introduced into the spinning nozzle (1) during spinning operation, the spinning nozzle (1) comprising an internal vortex chamber (6), the spinning nozzle (1) being a in the swirl chamber (6) protruding yarn forming element (7), which has an inlet (8) arranged within the swirl chamber (6) for the yarn (2) formed from the fiber structure (3) in the swirl chamber (6) the inlet (8) adjoining draw-off channel (9) and an outlet (10) which forms the end of the draw-off channel (9) and via which the yarn (2) can be drawn off from the spinning nozzle (1) during spinning, characterized in that,

that the spinneret (1) is designed to be divisible into at least two spinneret sections (12) along a separating surface (11), the outlet duct (9) being located in the separating surface (11) and being delimited by both spinneret sections (12) during spinning.

2. Spinneret (1) according to the preceding claim, characterized in that the discharge channel (9) can be separated by dividing the spinneret (1) along the separating surface (11) into two at least partially channel-shaped discharge channel sections (13).

3. spinneret (1) according to one of the preceding claims,

characterized in that the spinneret sections (12) can be pivoted relative to one another via a pivot axis (14) of the spinneret (1) and / or can be displaced relative to one another via a curved or linear guide (15) of the spinneret (1).

4. spinneret (1) according to one of the preceding claims, characterized in that at least one of the two spinneret sections (12) has a seal (16) which is in the spinning operation of the spinneret (1) between the two spinneret sections (12) and the swirl chamber (6) seals off at least in sections towards the outside.

5. spinneret (1) according to one of the preceding claims,

characterized in that the yarn-forming element (7) is designed to be divisible into two sections (17) along the separating surface (11), where each section (17) is part of a respective spinneret section (12).

6. spinneret (1) according to one of the preceding claims,

characterized in that the two sections (17) of the Garnbil formation element (7) are identical.

7. spinneret (1) according to one of the preceding claims,

characterized in that the two sections (17) of the Garnbil formation element (7) are arranged offset from one another in the spinning operation with respect to the separating surface (11) that in the area of an outer surface (18) of the yarn formation element (7) and / or in the area one or more steps (20) are present in an inner surface (19) delimiting the draw-off duct (9) inwardly, the step (s) in a predetermined direction of rotation one in the swirl chamber (6) in spinning operation via air nozzles (21) of the spinneret (1) introduced vortex air flow is or are sloping.

8. spinneret (1) according to one of the preceding claims,

characterized in that the inlet opening (5) of the spinneret (1) is formed by a fiber guide element (22), the fiber Guide element (22) along the separating surface (11) is designed to be divisible into two Einzelab sections (23), each individual section (23) being part of a respective spinneret section (12).

9. spinneret (1) according to one of the preceding claims,

characterized in that the housing (4) along the Trennflä surface (11) is designed to be divisible into two housing sections (24), each housing section (24) being part of a respective spinning nozzle section (12).

10. spinneret (1) according to one of the preceding claims,

characterized in that the fiber guide element (22) has a guide section (25) for guiding (15) the fiber strand (3) entering the spinneret (1), the guide section (25) being part of one of the two spinneret sections (12) and is cut from the parting surface (11) in the spinning operation.

11. spinneret (1) according to one of the preceding claims,

characterized in that at least one of the two spinneret sections (12) and / or at least one of the sections (17) of the yarn forming element (7) and / or at least one of the individual sections (23) of the fiber guide element (22) has at least one centering element (26) ), with the help of which it is ensured that the respective components assume a defined relative position to one another in the spinning operation.

12. Yarn-forming element (7) for a spinneret (1) of an air-jet spinning machine, the yarn-forming element (7) having an inlet (8) for a yarn (2), a discharge duct adjoining the inlet (8)

(9) and an outlet which forms the end of the exhaust duct (9)

(10) comprises over which the yarn (2) from the yarn forming element (7) is removable, characterized in that the Garnbildungsele element (7) is designed to be divisible into two sections (17) along a separating surface (11), the withdrawal channel (9) being in the separating surface (11).

13. Spinning station of an air-jet spinning machine with a spinning nozzle (1), characterized in that the spinning nozzle (1) is designed according to one of the preceding claims.

14. Spinning station according to the preceding claim, characterized in that the spinning station comprises a drafting system (27) with several drafting rollers (29) which are each rotatable about an axis of rotation (28), with at least one axis of rotation (28) in the separating surface ( 11) the spinneret (1) lies or runs parallel or at right angles to the separating surface (11).

15. Spinning station according to claim 12 or 13, characterized in that the spinning nozzle (1) is formed according to one of claims 3 to 11, wherein a first spinning nozzle section (12a) is rigidly fixed to a holding section (30) of the spinning station and the second Spinneret section (12b) can be pivoted and / or displaced relative to the first spinneret section (12a) with the aid of the pivot axis (14) and / or the guide (15).

16. A method for opening a spinning nozzle (1) of an air-jet spinning machine with a take-off channel (9) for a yarn (2) produced from a fiber structure (3) with the aid of the spinning nozzle (1), characterized in that the spinning nozzle (1) is divided into two spinneret sections (12) along a separating surface (11), the discharge duct (9) being located in the separating surface (11).

17. A method for piecing a spinning nozzle (1) of an air-jet spinning machine, characterized in that the spinning nozzle (1) is divided into two spinning nozzle sections (12) along a separating surface (11) after the interruption of a spinning operation, and a yarn (2 ) is introduced between the two spinneret sections (12) so that the spinneret sections (12) are then brought together again, the yarn (2) after being brought together via an inlet opening (5) into a swirl chamber (6) of the spinneret (1 ) and from there through a take-off channel (9) so that the yarn end protruding from the inlet opening (5) is brought into contact with a fiber structure (3), and that the spinning operation is then resumed.

18. The method according to the preceding claim, characterized in that at least one of the spinneret sections (12) when brought together has a movement component which runs parallel to the separating surface (11).