阅读说明：本技术 一种用于喷气纺纱机的纺纱喷嘴以及用于打开这种喷气纺纱机的方法 (Spinning nozzle for an air jet spinning machine and method for opening such an air jet spinning machine ) 是由 亚历山大·福斯 西蒙·莫里茨·芬克 G·沙夫勒 G·斯塔莱克 于 2020-02-07 设计创作，主要内容包括：本发明涉及一种用于喷气纺纱机的纺纱喷嘴(1),其中,所述纺纱喷嘴(1)被构造成在纺纱运行中由供应给所述纺纱喷嘴(1)的纤维束(3)制造纱线(2),其中,所述纺纱喷嘴(1)包括具有入口开口(5)的壳体(4),所述纤维束(3)在纺纱运行中能够经由所述入口开口被引入所述纺纱喷嘴(1)中,其中,所述纺纱喷嘴(1)包括位于内部的涡流室(6),其中,所述纺纱喷嘴(1)具有伸入到所述涡流室(6)中的纱线形成元件(7),所述纱线形成元件包括布置在所述涡流室(6)内的用于在所述涡流室(6)中由所述纤维束(3)形成的纱线(2)的入口(8),连接到所述入口(8)的抽出通道(9)以及形成所述抽出通道(9)的端部的出口(10),所述纱线(2)在纺纱运行中能够经由所述出口(10)从所述纺纱喷嘴(1)抽出,其中所述纺纱喷嘴(1)被构造成能够沿着分离面(11)分成至少两个纺纱喷嘴区段(12),其中所述抽出通道(9)位于所述分离面(11)中并且在纺纱运行中由两个纺纱喷嘴区段(12)限定。(The invention relates to a spinning nozzle (1) for an air jet spinning machine, wherein the spinning nozzle (1) is designed to produce a yarn (2) from a fiber strand (3) supplied to the spinning nozzle (1) during a spinning operation, wherein the spinning nozzle (1) comprises a housing (4) having an inlet opening (5) via which the fiber strand (3) can be introduced into the spinning nozzle (1) during the spinning operation, wherein the spinning nozzle (1) comprises an internal swirl chamber (6), wherein the spinning nozzle (1) has a yarn forming element (7) which projects into the swirl chamber (6) and comprises an inlet (8) arranged in the swirl chamber (6) for the yarn (2) formed from the fiber strand (3) in the swirl chamber (6), a withdrawal channel (9) connected to the inlet (8) and an outlet (10) forming an end of the withdrawal channel (9), via which outlet (10) the yarn (2) can be withdrawn from the spinning nozzle (1) in a spinning run, wherein the spinning nozzle (1) is configured to be separable into at least two spinning nozzle segments (12) along a parting plane (11), wherein the withdrawal channel (9) is located in the parting plane (11) and is defined by two spinning nozzle segments (12) in a spinning run.)

1. A spinning nozzle (1) for an air jet spinning machine, the spinning nozzle (1) being configured to produce a yarn (2) from a fiber strand (3) supplied to the spinning nozzle (1) in a spinning run, the spinning nozzle (1) comprising a housing (4) with an inlet opening (5) via which the fiber strand (3) can be introduced into the spinning nozzle (1) in a spinning run, the spinning nozzle (1) comprising an internal swirl chamber (6), the spinning nozzle (1) having a yarn forming element (7) projecting into the swirl chamber (6), the yarn forming element comprising an inlet (8) arranged within the swirl chamber (6) for a yarn (2) formed in the swirl chamber (6) by the fiber strand (3), a withdrawal channel (9) connected to the inlet (8) and an outlet (10) forming an end of the withdrawal channel (9), the yarn (2) can be drawn off from the spinning nozzle (1) via the outlet (10) in a spinning run, characterized in that the spinning nozzle (1) is configured to be separable along a parting plane (11) into at least two spinning nozzle segments (12), wherein the draw-off channel (9) is located in the parting plane (11) and is delimited by two spinning nozzle segments (12) in a spinning run.

2. Spinning nozzle (1) according to the preceding claim, characterized in that the extraction channel (9) can be separated by dividing the spinning nozzle (1) along the separation plane (11) into two extraction channel sections (13) formed at least partially as groove-like.

3. Spinning nozzle (1) according to any one of the preceding claims, characterized in that the spinning nozzle segments (12) are pivotable relative to each other via a pivot axis (14) of the spinning nozzle (1) and/or are movable relative to each other via a curved or linear guide (15) of the spinning nozzle (1).

4. Spinning nozzle (1) according to one of the preceding claims, characterised in that at least one of the two spinning nozzle segments (12) has a seal (16) which is located between the two spinning nozzle segments (12) during the spinning operation of the spinning nozzle (1) and seals the swirl chamber (6) at least partially outwards.

5. Spinning nozzle (1) according to one of the preceding claims, characterized in that the yarn forming element (7) is configured to be separable into two sections (17) along the separating plane (11), wherein each section (17) is an integral part of a spinning nozzle section (12), respectively.

6. Spinning nozzle (1) according to one of the preceding claims, characterized in that the two sections (17) of the yarn forming element (7) are identically constructed.

7. Spinning nozzle (1) according to one of the preceding claims, characterised in that in a spinning run the two segments (17) of the yarn forming element (7) are arranged offset from one another with respect to the separating surface (11) such that in the region of the outer surface (18) of the yarn forming element (7) and/or in the region of the inner surface (19) which inwardly delimits the extraction channel (9) one or more steps (20) are present, wherein the steps are configured in a descending manner in a predetermined direction of rotation of the whirling airflow which is introduced into the vortex chamber (6) via the air nozzle (21) of the spinning nozzle (1) in the spinning run.

8. Spinning nozzle (1) according to one of the preceding claims, characterized in that the inlet opening (5) of the spinning nozzle (1) is formed by a fiber guiding element (22), wherein the fiber guiding element (22) is configured to be separable into two individual sections (23) along the parting plane (11), wherein each individual section (23) is an integral part of a spinning nozzle section (12), respectively.

9. Spinning nozzle (1) according to one of the preceding claims, characterized in that the housing (4) is configured to be separable along the parting plane (11) into two housing sections (24), wherein each housing section (24) is an integral part of one spinning nozzle section (12) each.

10. Spinning nozzle (1) according to one of the preceding claims, characterized in that the fiber guiding element (22) has a guiding section (25) for guiding (15) the fiber bundle (3) entering the spinning nozzle (1), wherein the guiding section (25) is an integral part of one of the two spinning nozzle sections (12) and is cut off from the parting plane (11) during a spinning run.

11. Spinning nozzle (1) according to one of the preceding claims, characterized in that at least one of the two spinning nozzle segments (12) and/or at least one of the segments (17) of the yarn forming element (7) and/or at least one of the individual segments (23) of the fiber guiding element (22) has at least one centering element (26) by means of which it is ensured that the respective components occupy a defined relative position with respect to each other in a spinning run.

12. Yarn forming element (7) for a spinning nozzle (1) of an air jet spinning machine, wherein the yarn forming element (7) comprises an inlet (8) for a yarn (2), a withdrawal channel (9) connected to the inlet (8) and an outlet (10) forming the end of the withdrawal channel (9), through which outlet (10) the yarn (2) can be withdrawn from the yarn forming element (7), characterized in that the yarn forming element (7) is configured to be separable into two sections (17) along a separation plane (11), wherein the withdrawal channel (9) is located in the separation plane (11).

13. Spinning station for an air jet spinning machine having a spinning nozzle (1), characterized in that the spinning nozzle (1) is constructed according to any one of the preceding claims.

14. Spinning station according to the preceding claim, characterized in that it comprises a drafting device (27) with a plurality of drafting device rollers (29) which are each rotatable about a rotation axis (28), wherein at least one rotation axis (28) is located in the parting plane (11) of the spinning nozzle (1) or extends parallel or perpendicular to the parting plane (11).

15. Spinning station according to claim 12 or 13, characterized in that the spinning nozzle (1) is constructed according to any one of claims 3 to 11, wherein a first spinning nozzle section (12a) is rigidly fixed on a holding section (30) of the spinning station and the second spinning nozzle section (12b) is pivotable and/or movable relative to the first spinning nozzle section (12a) by means of the pivot axis (14) and/or the guide (15).

16. Method for opening a spinning nozzle (1) of an air jet spinning machine having a draw-off channel (9) for a yarn (2) produced from a fiber bundle (3) by means of the spinning nozzle (1), characterized in that the spinning nozzle (1) is divided into two spinning nozzle segments (12) along a parting plane (11), wherein the draw-off channel (9) is located in the parting plane (11).

17. A spinning method for a spinning nozzle (1) of an air jet spinning machine, characterized in that after an interruption of a spinning run, the spinning nozzle (1) is divided along a parting plane (11) into two spinning nozzle segments (12), then a yarn (2) is introduced between the two spinning nozzle segments (12), and then the spinning nozzle segments (12) are merged again, wherein after merging the yarn (2) extends through an inlet opening (5) into a swirl chamber (6) of the spinning nozzle (1) and from there through a withdrawal channel (9), the yarn end projecting from the inlet opening (5) is brought into contact with a fiber strand (3), and then the spinning run is started again.

18. Method according to the preceding claim, characterized in that at least one of the spinning nozzle segments (12) has a movement component which, when combined, extends parallel to the parting plane (11).

Technical Field

The invention relates to a spinning nozzle for an air jet spinning machine, wherein the spinning nozzle is designed to produce a yarn from a fiber strand supplied to the spinning nozzle during a spinning operation, wherein the spinning nozzle comprises a housing with an inlet opening, via which the fiber strand can be introduced into the spinning nozzle during the spinning operation, wherein the spinning nozzle has a yarn forming element which projects into the vortex chamber and comprises an inlet which is arranged in the vortex chamber for the yarn formed from the fiber strand in the vortex chamber, a discharge channel which is connected to the inlet, and an outlet which forms the end of the discharge channel, via which the yarn can be discharged from the spinning nozzle during the spinning operation.

The invention also relates to a yarn forming element for a spinning nozzle of an air jet spinning machine, wherein the yarn forming element comprises an inlet for a yarn, a withdrawal passage connected to the inlet and an outlet forming an end of the withdrawal passage, through which the yarn can be withdrawn from the yarn forming element.

Furthermore, a spinning station for an air jet spinning machine is described, which has a spinning nozzle.

Finally, the invention relates to a method for opening a spinning nozzle of an air jet spinning machine having a draw-off channel for a yarn produced from a fiber bundle by means of the spinning nozzle, and a spinning method for a spinning nozzle of an air jet spinning machine.

Background

Spinning nozzles of this type are used to produce yarns from an elongate fiber bundle by means of a swirling air flow generated by a corresponding air nozzle in a swirl chamber of the spinning nozzle. In this case, the outer fibers of the fiber bundles are wound around the inner fibers (core fibers) in the inlet region of the yarn forming element, which is usually in the form of a spindle, so that a yarn is produced which can be finally drawn off from the swirl chamber through the draw-off channel of the yarn forming element and wound onto the sleeve by means of a winding device.

In order to be able to clean the interior of the spinning nozzle, in particular the yarn forming element, manually or by means of an automatic handling device after the yarn production has stopped, it has already been proposed to design the housing of the spinning nozzle surrounding the swirl chamber in multiple parts. The individual housing sections are mounted so as to be movable relative to one another, so that the housing can be opened by moving one or more housing sections. After opening, the inner space of the spinning nozzle is accessible and deposits (viscose rayon softening, honeydew, etc.) can be removed.

Various opening mechanisms are already known (see for example EP 2573220 a2 or DE 102015100825 a 1).

It is also known to pass a previously spun yarn through the draw-off channel and then through the inlet opening of the housing, opposite to the transport direction of the yarn prevailing during yarn production, and to combine it with the fiber bundle provided by the drafting device before the spinning nozzle, viewed in the transport direction. Subsequently, the spinning run is started again, wherein the fiber bundle enters the spinning nozzle and is exposed to the vortex air flow generated in the vortex chamber.

In order to simplify said back-drawing of the yarn through the relatively thin draw-off channel and the inlet opening of the housing, it has been proposed that the yarn forming element is equipped with an injection nozzle through which air can be introduced into the draw-off channel against said conveying direction during the back-drawing of the yarn. An air flow is thereby generated which draws the yarn end into the draw-off channel and moves it in the direction of the inlet opening of the housing.

Disclosure of Invention

The object of the invention is to provide a spinning nozzle for an air jet spinning machine, a yarn forming element for a spinning nozzle, a spinning station with a corresponding spinning nozzle and an opening or spinning method for a spinning nozzle, which differ significantly from the prior art with regard to cleaning the interior of the spinning nozzle or of the extraction channel and with regard to the spinning process in which the yarn is guided past the spinning nozzle against the conveying direction.

This object is achieved by a spinning nozzle of an air jet spinning machine, a yarn forming element for a spinning nozzle, a spinning station with a corresponding spinning nozzle and an opening or spinning method for a spinning nozzle having the features of the independent claims.

The spinning nozzle according to the invention has a housing with an inlet opening, via which a fiber strand can be introduced into the spinning nozzle in a predetermined transport direction during a spinning operation. Furthermore, the spinning nozzle comprises an internal swirl chamber and a yarn forming element projecting into the swirl chamber. The yarn forming element comprises an inlet arranged in the vortex chamber for a yarn formed by the fiber strand in the vortex chamber, a draw-off channel connected to the inlet and an outlet forming an end of the draw-off channel, via which the yarn can be drawn off from the spinning nozzle during a spinning run.

In order to simplify the return of the yarn end through the spinning nozzle during the spinning process and the cleaning of the yarn end, it is proposed according to the invention that the spinning nozzle is designed such that it can be separated along a separating plane into two spinning nozzle segments, wherein the extraction channel is located in the separating plane and is delimited by the two spinning nozzle segments during the spinning operation.

The spinning nozzle can thus be divided into at least two sections outside the spinning run, wherein the division takes place along a parting plane which extends through the extraction channel during the spinning run. In this case, the separating plane extends through a longitudinal axis of the extraction channel extending in the conveying direction. Preferably, the extraction channel has an axis of symmetry lying in the parting plane.

If the spinning nozzle is now separated by separating at least two sections of the spinning nozzle from each other, the extraction channel is also open along its longitudinal axis and is accessible from the outside after separation. This enables cleaning of the extraction channel on the one hand. Likewise, the yarn end can be simply inserted into the extraction channel or one of the extraction channel sections after the spinning nozzle has been separated. If the spinning nozzle is subsequently closed again, i.e. the individual spinning nozzle segments are combined again into a spinning nozzle, the yarn segments inevitably lie in the extraction channel and therefore no longer need to pass through it during the spinning process.

The result of the invention is therefore to provide in particular that the spinning nozzle has a parting plane which extends through the spinning nozzle during the spinning operation of the spinning nozzle, i.e. without the spinning nozzle parting, wherein the extraction channel is located completely in the parting plane. Preferably, the separating surface is configured flat. Alternatively, the spinning nozzle can also be detachable with respect to the arched detaching surface. Finally, it is conceivable for the separating surface to have a plurality of segments which run offset or inclined to one another.

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

In any case, it is preferred that the separating plane extends between two planes which extend parallel to one another, wherein the distance between the two planes is between 0.1mm and 5 mm.

Furthermore, it is thus pointed out that the term "dividable" does not necessarily mean that the spinning nozzle can be divided into two spinning nozzle sections. Rather, more than two spinning nozzle segments can also be present, which together form a spinning nozzle during a spinning operation.

Furthermore, it should be noted that the individual spinning nozzle sections preferably comprise a part of the yarn forming element and a part of the housing, respectively.

It is also advantageous that the extraction channel can be divided by dividing the spinning nozzle along the parting plane into two extraction channel sections which are at least partially formed as grooves. Additionally or alternatively, the extraction channel may have a rotationally symmetrical inner surface, wherein this is not absolutely necessary.

If the spinning nozzle is divided along the separating plane, the extraction channel is also completely divided into two extraction channel sections, which in turn have the shape of a groove. Preferably, the parting plane is a plane of symmetry of the extraction channel.

It is also advantageous if the spinning nozzle segments are pivotable relative to one another via a pivot axis of the spinning nozzle. The pivot axis preferably extends parallel to the longitudinal axis of the extraction channel. It is particularly advantageous if the pivot axis is located in the parting plane or extends parallel to the parting plane.

The pivot axis is formed for example by a hinge. The articulation in turn comprises individual articulation sections, wherein each articulation section is connected with one of the spinning nozzle sections, in particular with a respective section of the housing. The hinge sections can in turn be connected to one another by hinge pins and can thus be moved relative to one another.

It is also conceivable that the spinning nozzle segments can be moved relative to one another by curved or linear guides of the spinning nozzle. For example, the individual housing sections can each have a guided section which interacts with a guide. It is also conceivable for the guide to be rigidly connected to one of the housing sections, wherein one or more further housing sections can be moved relative to the guide.

It is also advantageous if at least one of the two spinning nozzle segments has a seal which, during the spinning operation of the spinning nozzle, is located between the two spinning nozzle segments and at least partially seals the swirl chamber outwards. The seal can be present, for example, as a sealing line, which preferably extends in a groove of the housing section. The further housing section, which in the closed state of the spinning nozzle bears against the sealing strip, can be formed flat in the region of the seal or likewise have a groove.

Preferably, a respective seal (of which there may also be a plurality) extends from a first end side of the spinning nozzle comprising the inlet opening to a second end side of the spinning nozzle comprising the outlet of the yarn forming element. Furthermore, the outlet of the yarn forming element preferably forms a spinning nozzle outlet, via which the yarn leaves the spinning nozzle. In particular, in the case of two housing sections, at least two seals should be present, wherein the two seals can be located in the separating plane in the closed state of the spinning nozzle. Furthermore, the swirl chamber and thus the yarn forming element should be located between two seals in a cross section along the parting plane such that it seals outwards.

It is also advantageous if the yarn-forming element is configured such that it can be divided into two sections along the separating plane, wherein each section is a component of the spinning nozzle section. The separating surface thus divides not only the withdrawal passage but also the entire yarn-forming element. Preferably, the separating plane divides the yarn forming element into two axisymmetric sections, wherein the axis of symmetry should be formed by the longitudinal axis of the draw-off channel.

It is particularly advantageous if the two sections of the yarn forming element are of identical design, since this reduces the production costs of the yarn forming element.

It is also very advantageous if the two sections of the yarn forming element are arranged offset from one another in relation to the separating surface during the spinning operation, so that one or more steps are present in the region of the outer surface of the yarn forming element. Furthermore, the one or more steps should be designed in a descending manner in the predetermined direction of rotation of the whirling airflow which is introduced into the whirling chamber via the air nozzles of the spinning nozzles during the spinning operation.

If the fibers now move on the outer surface of the yarn forming element in the inlet region of the yarn forming element when the yarn is produced from the fiber bundle, it is ensured by the step that the fibers of the fiber bundle are not caught between the two sections of the yarn forming element or between the abutting edges between the two sections. More precisely, it slides on a step which is configured in a descending manner in the direction of movement of the fibre.

Alternatively or additionally, it may also be advantageous if a corresponding step is also present in the region of the inner surface of the yarn forming element which limits the withdrawal passage inwards. In this case, the step should also be configured obliquely in the direction of rotation of the thread which moves through the draw-off channel in order to avoid fibers being caught between the sections of the thread-forming element.

In other words, it is advantageous if a step is present both in the region of the outer surface of the yarn forming element, preferably in the region of its inlet, and in the region of the inner surface of the yarn forming element, said step being formed by the mutual overlapping of the two sections of the yarn forming element. The step is configured relative to the longitudinal axis of the withdrawal passage in such a way that the radial distance between the longitudinal axis of the withdrawal passage and the outer surface of the yarn-forming element decreases in the region of the separating side in the predetermined circumferential direction of the yarn-forming element. In the same circumferential direction, the radial distance between the longitudinal axis and the inner surface of the extraction channel in the region of the parting plane should increase.

It is particularly advantageous if the inlet opening of the spinning nozzle is formed by a fiber guiding element, wherein the fiber guiding element is configured to be separable into two individual sections along a parting plane. In the undivided state of the spinning nozzle, the two individual sections form a channel section through which the fibers are guided perpendicular to their transport direction when entering the spinning nozzle. In order to be able to guide the yarn through the spinning nozzle in a simple manner counter to the conveying direction during the spinning process, the separability of the fiber guiding element is advantageous. If the spinning nozzle is divided, the two individual sections of the fiber guiding element are also moved apart from one another, so that the guided-back yarn can be inserted between the two individual sections. If the spinning nozzle is subsequently closed again, the yarn automatically passes through the inlet opening of the spinning nozzle, i.e. the yarn is surrounded on all sides by the fiber guiding element. In this case, each individual segment is to be a component of the spinning nozzle segment.

It is also advantageous if the housing is configured such that it can be divided along a separating plane into two housing sections, wherein each housing section is a component of the spinning nozzle section. The housing comprises an outer surface of the spinning nozzle visible from the outside and inwardly defines a swirl chamber. Furthermore, in each case one section of the yarn forming element and a single section of the fiber guiding element should be connected to the housing section. The connection can be realized here, for example, by a form-fit connection or a force-fit connection.

It is also conceivable that one or more sections of the yarn-forming element, one or more housing sections or one or more individual sections of the fiber-guiding element have one or more magnets which hold the respective components to one another in the spinning position.

It is also advantageous if the fiber guiding element has a guiding section for guiding the fiber strand entering the spinning nozzle, wherein the guiding section is a component of one of the two spinning nozzle sections and is separated from the separating surface during the spinning operation. The guide section is preferably a surface which deflects the fiber strand entering the spinning nozzle laterally with respect to the transport direction. This produces a twist stop which prevents the swirling flow of the fiber strand, which is generated by the swirling air flow inside the spinning nozzle, from propagating against the transport direction to the outside of the spinning nozzle. In order to prevent the fibers of the fiber bundle from catching on the contact surfaces of the two individual sections of the fiber guiding element, it is advantageous if the guiding section is formed completely by one of the individual sections. The individual segments of the fiber guiding element are therefore preferably neither identical nor configured symmetrically with respect to the separating plane.

It is also advantageous if at least one of the two spinning nozzle sections has at least one centering element, by means of which it is ensured that the two spinning nozzle sections assume a defined relative position with respect to one another during the spinning operation. The centering element can be, for example, a projection which is part of the spinning nozzle section and which interacts with a recess of the second spinning nozzle section during the spinning operation, said recess also acting as a centering element. It is particularly advantageous if both spinning nozzle sections each have one or more centering elements, wherein one half of the centering elements is designed as a centering cone and the second half of the centering elements is designed as a recess, into which the centering cone engages during the spinning operation.

In addition or alternatively, it may also be advantageous for at least one section of the yarn forming element and/or at least one individual section of the fiber guiding element to have one or more centering elements. Preferably, the two sections of the yarn forming element and/or the two individual sections of the fiber guiding element each have one or more centering elements.

The invention furthermore comprises a yarn forming element for a spinning nozzle of an air jet spinning machine, wherein the yarn forming element comprises an inlet for the yarn, a withdrawal passage connected to the inlet and an outlet forming an end of the withdrawal passage, through which the yarn can be withdrawn from the yarn forming element. The thread-forming element is characterized in that it is configured to be separable into two sections along a separation plane, wherein the draw-off channel is located in the separation plane. Preferably, the two segments are identical or are configured axisymmetrically with respect to the longitudinal axis of the extraction channel. 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 provided that the separating surface extends through the entire withdrawal passage, i.e. from the inlet to the end thereof and thus to the outlet of the yarn-forming element. This ensures that the channel section of the cloth is completely exposed and thus externally accessible when the yarn-forming element is divided into its individual sections.

Furthermore, a spinning station for an air jet spinning machine is proposed. The spinning station preferably comprises a drafting device known from the prior art, which has a plurality of drafting device rollers, which are each rotatable about an axis of rotation. Before the fiber bundle is introduced into the spinning nozzle, the fiber bundle fed to the spinning nozzle is drawn by means of a drawing device and is thus homogenized. In the spinning nozzle, the actual yarn production is performed by applying a swirling air flow to the fiber bundle in a swirling chamber of the spinning nozzle. Thereby, the outer fibers of the fiber bundle are wound around the fiber core located inside. The yarn produced in this way is finally drawn off from the spinning nozzle via the draw-off channel of the yarn forming element and subsequently applied to the sleeve of the winding section of the spinning station.

The spinning nozzle has a separating surface described above or below, so that the spinning nozzle can be divided into two spinning nozzle sections, which can be separated from each other or pivoted relative to each other by separation. Furthermore, the spinning nozzle has one or more of the features described above or below.

Advantageously, the at least one axis of rotation is located in or extends parallel to the parting plane of the spinning nozzle. Alternatively, it is also conceivable for the at least one axis of rotation to be oriented at right angles or at an inclination to the trend plane.

It is also advantageous if the spinning nozzle has the above-mentioned pivot axis or guide, wherein the first spinning nozzle section is rigidly fixed on a holding section of the spinning station and the second spinning nozzle section is pivotable and/or movable relative to the first spinning nozzle section by means of the pivot axis and/or guide. The rigidly fixed spinning nozzle section therefore always has a fixed predetermined position in space both in the spinning position and after the separation of the two spinning nozzle 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 invention relates to a method for opening a spinning nozzle of an air jet spinning machine having a draw-off channel for a yarn produced from a fiber strand by means of the spinning nozzle. In particular, the spinning nozzle is constructed as described above or below. According to the invention, the spinning nozzle is divided into two spinning nozzle sections along the separating plane, wherein the drawing channel is located in the separating plane.

The opening of the spinning nozzle is preferably effected by pivoting or moving the spinning nozzle section away from the second spinning nozzle section on a straight or curved guide rail relative to the second spinning nozzle section which is rigidly fixed on the holding section of the spinning station. Alternatively, the spinning nozzle can also be integrated into the spinning station and fixed on the holding structure, so that when the spinning nozzle is opened, the two spinning nozzle sections are pivoted or moved relative to the holding structure.

In particular, when the spinning nozzle is open, not only the two housing sections of the spinning nozzle, but also the two sections of the yarn forming element and the two individual sections of the fiber guiding element of the spinning nozzle should be moved relative to each other.

By opening the spinning nozzle, i.e. by separating and removing the two spinning nozzle sections, the interior of the spinning nozzle is accessible for cleaning purposes. In a simple manner, the thread can likewise be inserted into one of the two withdrawal channel sections within the scope of the spinning process, so that the complex threading of the thread through the withdrawal channel known from the prior art is dispensed with.

Finally, the invention comprises a spinning method for a spinning nozzle of an air jet spinning machine, wherein the spinning nozzle is preferably constructed according to the above or the below.

If the yarn production is interrupted, a yarn end on the winding side (i.e. the yarn end which has already been wound onto the sleeve to form a yarn bobbin) is produced. In the subsequent spinning process, the yarn end must be brought into contact again with the fiber bundle supplied by the drafting device in order to be able to start the spinning process again.

For this purpose, it has hitherto been necessary to pass the yarn end through the extraction channel and subsequently through the inlet opening of the spinning nozzle against the transport direction prevailing during the spinning operation. However, this threading process is technically complicated and cannot always be performed reliably.

In order to overcome this disadvantage, it is proposed according to the invention that the spinning nozzle is divided into two spinning nozzle sections along a separating plane after the interruption of the spinning operation. The separating surface extends in this case through the yarn forming element and in this case through the extraction channel and the inlet opening of the spinning nozzle. In particular, the extraction channel is located entirely in the separating plane.

Subsequently, the yarn from the yarn bobbin is inserted between the two spinning nozzle sections, wherein the yarn after insertion preferably only comes into contact with one of the two spinning nozzle sections. In particular, the yarn should be inserted in such a way that it extends in the withdrawal channel section before the spinning nozzle section is closed.

Subsequently, the two spinning nozzle segments are recombined, wherein the yarn after the combination extends via the inlet opening into the swirl chamber of the spinning nozzle and from there extends through the withdrawal channel of the yarn forming element of the spinning nozzle. Finally, the yarn ends projecting from the inlet opening are brought into contact with the fiber bundle.

Subsequently, the spinning run is started again, wherein the previously stopped drafting device is activated again and the yarn protruding from the spinning nozzle beyond the outlet of the yarn forming element is wound onto the sleeve again.

In the prior art, it has therefore been customary to pass the yarn end through the extraction channel and the inlet opening of the spinning nozzle against the conveying direction with the spinning nozzle closed. In contrast, the invention now provides that the spinning nozzle is first opened as follows: the two spinning nozzle sections are moved relative to each other such that the extraction channel is divided into two extraction channel sections, wherein the two extraction channel sections are accessible from the outside after the spinning nozzle is opened.

Likewise, the spinning nozzle section comprising the inlet opening of the spinning nozzle is divided into two sections when the spinning nozzle is open. In particular, a separate movement of the two sections of the fiber guiding element forming the inlet opening is achieved here. Subsequently, the yarn end is placed between the two spinning nozzle sections, and then the two spinning nozzle sections are moved towards each other or connected to each other again. Thereby, the spinning nozzle again takes up the closed shape and position it had before the spinning nozzle was opened. The spinning run can then be restarted.

It is also advantageous if at least one of the spinning nozzle segments has a movement component which, when combined, extends parallel to the separating plane. Thus, when the spinning nozzle is closed, the two spinning nozzle segments preferably do not move towards each other in a linear movement. More precisely, 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 the spinning nozzle section is pivoted relative to the second spinning nozzle section, wherein the pivot axis extends outside the parting plane.

Drawings

Further advantages of the invention are described in the following examples. Schematically showing:

figure 1 selected sections of a spinning station of an air jet spinning machine,

figure 2 top view of a spinning nozzle according to the invention,

fig. 3 is a front view of another embodiment of a spinning nozzle according to the invention, with different positions of the left housing section,

figure 4 spinning nozzle section of a spinning nozzle according to the invention,

fig. 5a perspective view of the housing of the spinning nozzle according to the invention, with the fibre guiding element in the closed position (fig. 5a) and in the open position (fig. 5b),

figure 6 shows two sections of a yarn forming element according to the invention,

figure 7a is a top view of a yarn forming element according to the invention,

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

Figure 8 is a top view of another yarn forming member according to the present invention.

List of reference numerals

1 spinning nozzle

2 yarn

3 fiber bundle

4 casing

5 inlet opening

6 vortex chamber

7 yarn forming element

8 yarn forming element inlet

9 extraction channel

10 yarn forming element outlet

11 separating surface

12 spinning nozzle section

13 extraction channel section

14 pivot axis

15 guide piece

16 sealing element

17 yarn forming element section

18 yarn forming element outer surface

19 inner surface of the extraction passage

20 steps

21 air nozzle

22 fiber guide element

23 individual sections of a fiber guiding element

24 housing segment

25 guide section of a fiber guide element

26 centering element

27 draft device

28 axis of rotation

29 drafting device roller

30 holding section

31 yarn bobbin

32 guide section

33 hinge part

34 suction opening

Detailed Description

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

The spinning station comprises a drafting device 27, the drafting device 27 having a plurality of drafting device rollers 29, the drafting device rollers 29 being driven about a rotational axis 28 (drive device not shown). The drafting and thus the homogenization of the fiber bundle 3 passing through the drafting device 27 is achieved by different rotational speeds of the drafting device rollers 29.

After passing through the drafting device 27, the fiber bundle 3 is introduced into the spinning nozzle 1 via the inlet opening 5, in which spinning nozzle 1 the fiber bundle 3 is subjected to a swirling air flow. Thereby, the outer fibers of the fiber bundle 3 are wound around the core fibers of the fiber bundle 3 located inside, resulting in a yarn 2 with true twist. The yarn 2 finally leaves the spinning nozzle 1 via the outlet 10 of the yarn forming element 7 arranged in the spinning nozzle 1 and can then be applied to a sleeve, forming a yarn bobbin 31.

If a yarn break or other interruption of the yarn production now occurs in the spinning run, the yarn 2 separates from the fiber bundle 3, so that a yarn end is produced. During the subsequent spinning process, this yarn end must be brought into contact again with the fiber bundle 3 in order to be able to be subsequently reintroduced into the spinning nozzle 1 together with the fiber bundle 3.

It is common to this end that the yarn end, proceeding from the yarn bobbin 31, passes through the spinning nozzle 1 counter to the direction of transport (direction of transport: from left to right in fig. 1) prevailing during the spinning operation and overlaps the fiber bundle 3 between the spinning nozzle 1 and the drawing frame 27 or within the drawing frame 27. However, this is technically quite complex and error-prone.

The invention therefore proposes an alternative possibility which renders the abovementioned threading process superfluous.

As shown in fig. 2, the spinning nozzle 1 according to the invention now comprises at least two spinning nozzle segments 12, which during the spinning operation lie against one another along the separating surface 11.

The spinning nozzle 1 is now configured such that it can be separated along the separating plane 11, i.e. the two spinning nozzle segments 12 can be moved relative to each other.

Fig. 2 shows a solution in which two spinning nozzle segments 12 are each connected to a guide 15 by a guide segment 32. The two spinning nozzle segments 12 can be moved along the guide 15 separately from one another in the direction of the two illustrated arrows. Thereby opening the spinning nozzle 1. The separating surface 11 here extends not only through the inlet opening 5 of the spinning nozzle 1 but also through an outlet opening of the spinning nozzle 1, which is formed by an outlet 10 of the yarn forming element 7, which will be explained in more detail later.

As an alternative to the solution shown, it is of course also conceivable for the spinning nozzle section 12 to be rigidly connected to the guide 15 or the holding section 30 of the spinning station, so that only one of the two spinning nozzle sections 12 is mounted movably. In any case, the two spinning nozzle segments 12 can be moved relative to each other, whereby the spinning nozzle 1 can be opened in a simple manner. After opening the spinning nozzle 1, the yarn 2 can finally be inserted between the two spinning nozzle segments 12. If the two spinning nozzle sections 12 finally merge again, the thread 2 extends through the spinning nozzle 1 without a threading process being required for this purpose.

Fig. 3 shows an alternative possibility. Here, the spinning nozzle 1 also has a separating surface 11, the separating surface 11 extending through the inlet opening 5 of the spinning nozzle 1 and the outlet 10 of the yarn forming element 7. In contrast to fig. 2, the two spinning nozzle sections 12 are connected by a hinge 33, so that the two spinning nozzle sections 12 can pivot relative to one another about the pivot axis 14. In this case, it is also conceivable for one of the two spinning nozzle segments 12 to be rigidly connected to the holding segment 30, so that only the second spinning nozzle segment 12 is pivotably supported.

Furthermore, it can also be seen from the figures shown up to now that the spinning nozzle 1 basically has a housing 4, wherein the housing 4 comprises at least two housing sections 24, which are each movable relative to one another as part of the spinning nozzle section 12.

In fig. 4, one of the two spinning nozzle sections 12 is now shown. The spinning nozzle section 12 basically comprises a housing section 24 and a single section 23 of a fiber guiding element 22, which is also designed separately, for guiding the fiber bundle 3 entering the spinning nozzle 1. At the same time, the fiber guiding element 22 forms the inlet opening 5 of the spinning nozzle 1.

Fig. 4 furthermore shows that half of the swirl chamber 6 is arranged in the spinning nozzle section 12, in which swirl chamber a swirling air flow is generated by the air introduced via the air nozzles 21 of the spinning nozzle 1 during the spinning operation. This swirling air flow causes the core fibers of the introduced fiber bundle 3 to be desirably entangled by the fibers outside thereof. The yarn 2 thus formed enters the withdrawal channel 9 via the inlet 8 of the yarn forming element 7 or is formed only in the region of the inlet and finally exits the spinning nozzle 1 via the outlet 10 of the yarn forming element 7.

The illustrated spinning nozzle section 12 of course comprises only one extraction channel section 13, since the separating surface 11 extends through the extraction channel 9 and also divides the extraction channel into two sections. Thus, by separating the spinning nozzle 1, the inner surface 19 of the extraction channel is accessible from the outside.

The same applies to the thread-forming element 7, which can likewise be divided into two sections 17 along the separating plane 11. The spinning nozzle section 12 according to fig. 4 therefore also contains only one section of the yarn forming element 7.

In principle, therefore, the spinning nozzle segment 12 shown in fig. 4 forms half of the spinning nozzle 1, wherein the spinning nozzle segment 12 comprises, in addition to the segment 17 of the yarn forming element 7, a single segment 23 of the fiber guiding element 22.

The two spinning nozzle segments 12 (only one of which is shown in fig. 4) of the spinning nozzle 1 are of substantially identical design.

In order to ensure that the swirl chamber 6 is sealed off from the outside during operation of the undivided spinning nozzle 1, at least one of the two spinning nozzle segments 12 has one or more seals 16. In the example shown, there are two seals 16, which may be formed, for example, by seal lines. If the two spinning nozzle segments 12 now move toward one another again after separation and come into contact with one another along the separating surface 11, the seal 16 ensures that no air escapes laterally outward between the two housing segments 24.

Finally, fig. 4 shows that the spinning nozzle 1 preferably has a suction opening 34, via which air introduced via the air nozzle 21 can be discharged during operation of the spinning nozzle 1. Preferably, the suction opening 34 is only a constituent part of the spinning nozzle section 12 and is located outside the separating surface 11, so that no sealing is required here.

Fig. 5a (closed spinning nozzle 1) and 5b (open spinning nozzle 1) now show a further advantageous feature of the spinning nozzle 1 according to the invention, in which only two housing sections 24 of the fiber guiding element 22 and the individual sections 23 are shown.

Although the parting plane 11 extends through the fibre guide element 22. However, the fiber bundle has a guide section 25 for the fiber bundle 3, which is constructed in one piece. This has the advantage that the fibers of the fiber bundle 3 cannot become jammed or caught in the separating gap of the guide section 25 when the fiber bundle 3 is drawn into the spinning nozzle 1 during the spinning operation.

In fig. 6, two sections 17 of the yarn forming element 7 are shown, which sections 17, after being combined, form the yarn forming element 7. In order to ensure that the mutual orientation of the two sections 17 in the spinning operation always corresponds to the specification, the two sections 17 have a plurality of centering elements 26, wherein one part of the centering elements 26 is designed as a protruding centering cone and the other part is designed as a recess which projects into the section 17 of the yarn forming element 7. If the two sections 17 of the yarn forming element 7 are joined together, the centering cone engages into the recess and thereby brings about a correct mutual orientation of the two sections of the yarn forming element 7 (for the sake of clarity, only a part of the centering element 26 is provided with a reference numeral).

Fig. 7a (top view) and 7b (side view) show a further advantageous embodiment of the yarn-forming element 7 according to the invention.

As already mentioned, the outer fibers of the fiber bundle 3 are wound around the inner core fibers during yarn production. Here, the external fiber moves in a circumferential movement around the outer surface 18 of the yarn forming element 7 in the direction of the arrow shown in fig. 7 a. At the same time, contact occurs between the outer fibres and the inner surface 19 of the extraction channel 9.

If the extraction channel 9 now, as envisaged, consists of two extraction channel sections 13 which, during the spinning operation, abut against one another, there is a risk of fibres sticking 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 so that a step 20 is produced at least in the region of the inlet 8. In this case, the step 20 is configured such that the fibers of the fiber bundle 3 or the yarn 2 are present in movement along the outer surface 18 of the yarn forming element 7 or are guided by the descending step 20 to the inner surface 19 of the extraction channel 9. The step 20 thus has a turbulent flow effect to some extent and prevents the fibres from becoming stuck or sticking in the region of the parting plane 11.

Finally, fig. 8 shows another possible feature of the yarn forming element 7 according to the invention. As can be seen from a comparison of the figure with fig. 7a, there is also a step 20 in the embodiment shown in fig. 8 in order to prevent damage to the passing fibres. In addition, however, the two sections 17 of the yarn forming member 7 engage each other (see dashed lines). In this case, the separating surface 11 is therefore not of flat design, but comprises three sections which run parallel to one another.

In this case, the interlock may be configured such that a corresponding stepped section is also formed in the region directly surrounding the inlet 8 of the yarn forming element 7.

The invention is not limited to the embodiments shown and described. Variations within the scope of the claims are equally possible with any combination of the described features, even if they are shown and described in different parts of the description or the claims or in different embodiments, provided that they do not contradict the teaching of the independent claims.