EP4015681A1 - Spinning station with a cleaning nozzle and method for cleaning a yarn forming element - Google Patents

Abstract

The invention relates to a spinning position of an air-jet spinning machine and a method for cleaning a yarn-forming element of an air-jet spinning nozzle. In order to provide a spinning position of an air-jet spinning machine and a method for cleaning a yarn-forming element of an air-jet spinning nozzle of the air-jet spinning machine, which enable long and trouble-free operation with consistent quality and strength of the yarn produced, it is provided that the spinning position is an air-jet spinning nozzle with a yarn-forming element arranged within a turbulence chamber for Manufacturing a yarn from a sliver fed to the air-spinning nozzle, wherein the air-spinning nozzle can be converted from a closed state for yarn formation into an open state in which the yarn-forming element can be cleaned. In addition, at least one cleaning nozzle for cleaning the yarn-forming element is arranged at the spinning station when the air-spinning nozzle is open, the cleaning nozzle being designed, in particular positioned and/or aligned or positionable and/or alignable, in such a way that at least when the air-spinning nozzle is open, the yarn-forming element passes through the cleaning nozzle can be charged with a cleaning medium.

Description

The invention relates to a spinning position of an air-jet spinning machine and a method for cleaning a yarn-forming element of an air-jet spinning nozzle.

In general, during air spinning, a drafting sliver is drawn in a defined manner according to the yarn count to be achieved by means of a multi-roller drafting system and then fed to an air spinning nozzle. Inside a turbulence chamber of the air spinning nozzle, the outer fibers of the sliver are wound around an internal fiber core by means of a turbulent air flow generated by air nozzles in the area of an inlet opening of a yarn-forming element of the air spinning nozzle, resulting in an air-yarn-specific yarn structure of a parallel yarn core and twisted fibers lying at a certain angle, whereby the wrapping fibers are crucial for the desired strength of the yarn.

In principle, the air spinning process can be carried out with fibers made of different materials, whereby both natural fibers, such as cotton and/or animal wool, and synthetic fibers, such as polyester, and mixtures of natural and synthetic fibers can be used. In practice, when polymer fibers, in particular fibers made of polyester (PES), are spun in practice, polymer residues, polyester fiber fragments and/or finishing agents are often deposited on a surface of a spinning cone of the yarn-forming element. However, such deposits significantly disrupt the air-jet spinning process and significantly reduce the spinning result and thus the yarn quality. In particular, yarn breakages can occur during the spinning process due to the increased friction between the surfaces of the air spinning nozzle and the fibers. In addition, the air nozzles and other components of the air spinning nozzle can become clogged with deposits, so that the yarn obtained has a lower yarn strength and yarn quality.

The invention is therefore based on the object of providing a spinning position of an air-jet spinning machine and a method for cleaning a yarn-forming element of an air-jet spinning nozzle which enable particularly long and trouble-free operation with consistent quality and strength of the yarn produced.

The object is achieved according to the invention by a spinning position of an air-jet spinning machine according to claim 1 and a method for cleaning a yarn-forming element of an air-jet spinning nozzle according to claim 7. Advantageous developments of the invention are specified in the dependent claims.

The spinning position of an air-jet spinning machine according to the invention has an air-spinning nozzle with a yarn-forming element arranged within a turbulence chamber for producing a yarn from a fiber sliver fed to the air-spinning nozzle, wherein the air-spinning nozzle can be converted from a closed state for yarn formation into an open state in which the yarn-forming element can be cleaned. In addition, at least one cleaning nozzle for cleaning the yarn-forming element when the air spinning nozzle is open is assigned to the spinning station or is arranged on the spinning station, with the cleaning nozzle being designed, in particular positioned and/or aligned or positionable and/or alignable in such a way that at least in the open State of the air spinning nozzle, the yarn formation element can be acted upon by the cleaning nozzle with a cleaning medium.

In the method according to the invention for cleaning a yarn-forming element of an air spinning nozzle, the air-spinning nozzle having a whirl chamber is first opened to make the yarn-forming element arranged in the whirl chamber accessible, then and/or at the same time the yarn-forming element and/or a cleaning nozzle is moved into a cleaning position and finally the yarn-forming element with at least one cleaning medium applied.

The inventors have recognized that regular cleaning of the yarn-forming element enables long and trouble-free operation with consistent quality and strength of the yarn produced, with such cleaning being possible in a particularly simple manner and without a disruptive effect on the other components of the air-jet spinning machine if the Air spinneret is in an open position, for example in the course of a spinning interruption after a thread breakage or a planned cut of the yarn. The invention advantageously allows an increase in strength and greater cleanliness spun yarns.

An air spinneret is first understood to be any spinneret which, by means of at least one air stream, swirls fibers, in particular twisted fibers, around an internal fiber core to form a thread or yarn. The process of yarn formation takes place in the area of a turbulence chamber of the air spinning nozzle, in which at least one yarn-forming element is arranged. The air-jet spinning nozzle is surrounded by a spinning station, each spinning station serving to produce a yarn from a sliver fed to the air-jet spinning nozzle. The air spinning nozzle has an inlet for the sliver, the internal whirl chamber, one or more yarn forming or spinning elements arranged at least in sections in the whirl chamber, and an outlet for the yarn produced inside the whirl chamber. In addition, the air spinning nozzle preferably has a plurality of air nozzles opening into the turbulence chamber, which are particularly preferably in fluid communication with at least one air supply line, wherein during spinning operation of the spinning station, in which the yarn is produced by means of the air spinning nozzle, compressed air provided by the air supply line via the air nozzles in flows into the vortex chamber to generate a vortex air flow within the vortex chamber for air-spinning the supplied sliver into a yarn.

A yarn or a thread within the meaning of the invention is a fiber structure in which at least some of the fibers are wound around an internal fiber core. A yarn can also be a roving or a roving for further processing, for example by means of a ring spinning machine. The sliver and thus the yarn produced from it is preferably formed at least partially, particularly preferably completely, from synthetic fibers or man-made fibers, for example from polyester or from polyethersulfone.

The sliver is basically the fibrous material fed to the air spinning process, which is preferably provided as a coherent sliver or composite of fibers to be spun. All the fibers can be formed from the same material or the sliver can contain fibers that are chemically different from one another. In principle, however, the fibers in the sliver are not yet spun together.

The Garnbildungselement can be both an independent component, as well as a section of a Be a structural unit or a functional unit that is directly involved in the air spinning process. The yarn formation element can be formed in one piece or in several pieces. The yarn-forming element preferably has a spinning cone or part of a spinning cone, and the yarn-forming element very particularly preferably forms the spinning cone. During the air-spinning process, the yarn-forming element comes into direct contact, at least in sections, with the fibers to be spun to produce the yarn and with the spun yarn.

According to the invention, the air spinning nozzle can be switched from a closed state of the air spinning nozzle, in which the turbulence chamber is preferably formed by the air spinning nozzle and the yarn-forming element arranged in the turbulence chamber is surrounded by the turbulence chamber, to an open state in which the turbulence chamber is preferably opposite to the outer environment of the air spinning nozzle is opened and the yarn forming element is exposed for cleaning, for which purpose preferably at least a first component of the air spinning nozzle, which more preferably comprises the yarn forming element, can be moved relative to a further component of the air spinning nozzle. The first and the second component of the air spinning nozzle have, in particular, wall sections which at least partially delimit the turbulence chamber in the closed state of the air spinning nozzle. The first component of the air spinning nozzle, which particularly preferably comprises the yarn-forming element, is particularly preferably moved, in particular shifted and/or pivoted, relative to the second component of the air spinning nozzle, which is preferably arranged stationary at the spinning station. The closed state of the air spinning nozzle is intended for yarn formation, while in the open state of the air spinning nozzle the yarn forming element is at least partially and particularly preferably completely accessible for cleaning.

The opening of the air spinning nozzle and the movement of the yarn-forming element and/or preferably the cleaning nozzle can take place either completely one after the other or at least partially at the same time. It is also conceivable that when the air spinning nozzle is opened, the yarn-forming element is moved into a cleaning position at the same time or immediately thereafter, in which case a movement of the cleaning nozzle into a cleaning position is not necessary, but is preferably also possible.

In principle, the cleaning position is that position of the yarn-forming element and/or the cleaning nozzle in which the yarn-forming element is cleaned by at least one cleaning medium by means of the cleaning nozzle. The cleaning position of the cleaning nozzle is preferably outside of the vortex chamber and/or opposite a surface of the yarn-forming element. The cleaning position is provided for operating the cleaning nozzle, with the cleaning nozzle preferably being operated exclusively in the cleaning position. In the cleaning position, no further component of the air spinning nozzle, the spinning position and/or the air spinning machine is preferably arranged in an impingement path between an outer surface of the yarn-forming element and the at least one cleaning nozzle, particularly preferably all cleaning nozzles.

In principle, the cleaning by means of the cleaning nozzle can take place in any manner, with the method for cleaning preferably comprising a defined cleaning cycle, which in particular is made up of a number of cleaning steps. In this context, cleaning preferably means removing dirt from the yarn-forming element, in particular deposits of fibers, finishes and/or polymers. The dirt is particularly preferably removed from the outer surface of the yarn-forming element and/or at least part of a thread withdrawal channel inside the yarn-forming element.

In order to enable the yarn-forming element to be cleaned, a cleaning nozzle for dispensing a cleaning medium and for feeding the cleaning medium to the yarn-forming element is provided according to the invention. For this purpose, the cleaning nozzle is arranged at the spinning station and/or directed towards the spinning station. At least one cleaning nozzle is preferably assigned to two spinning positions, more preferably to a single spinning position. For this purpose, the cleaning nozzle can preferably be arranged in the area of two adjacent spinning stations in such a way that the cleaning nozzle can apply a cleaning medium to the respective yarn-forming element of these two spinning stations. More preferably, a cleaning nozzle is arranged at each spinning station. Furthermore, the cleaning nozzle is preferably a nozzle for cleaning the yarn-forming element by means of a liquid and/or a gas. Accordingly, the cleaning medium can be either a gas or a liquid. In addition, any mixtures of gases and liquids, in particular aerosols, foams and/or emulsions, are also conceivable as the cleaning medium.

Although sufficient cleaning of the yarn-forming element can be achieved by means of a single cleaning nozzle, more than one cleaning nozzle can also be arranged in the area of a yarn-forming element, with preferably several cleaning nozzles in the cleaning position directed at different surface sections of the yarn-forming element and/or from different directions at the yarn-forming element or are adjustable. The cleaning nozzle is also preferably formed in order to apply the cleaning medium to at least one surface section of the yarn-forming element by means of atomizer technology. The cleaning nozzle particularly preferably has a liquid atomizer, and the cleaning nozzle is very particularly preferably designed as a liquid atomizer.

According to the invention, the cleaning nozzle is designed, in particular positioned and/or aligned or positionable and/or alignable, in such a way that the yarn-forming element can be acted upon by the cleaning medium in the cleaning position. The application of cleaning medium is understood to mean that a cleaning medium is guided onto at least a part or a section of the surface of the yarn-forming element.

The supply of at least one cleaning medium to the cleaning nozzle preferably takes place via at least one cleaning medium line, which can be formed both as a pure liquid line and as a pure gas line or alternatively as a mixed line. Furthermore, in particular, the supply of gases and liquids as a cleaning medium can take place via different lines or lines that are separate from one another. An activation and/or dosing unit is preferably arranged in the supply direction of the at least one cleaning medium and especially for each individual cleaning medium in front of the cleaning nozzle, which is particularly preferably formed as a valve and/or as an adjustable throttle in order to regulate the quantity or the flow of the Being able to regulate the cleaning medium supplied to the yarn formation element in a defined manner.

In a preferred embodiment of the spinning position, at least one cleaning nozzle is arranged outside the turbulence chamber and/or stationary on or in the area of the spinning position, whereby a particularly simple structure can be achieved and the air spinning process is not disturbed by the cleaning nozzle. In addition, there can be no impairment of the Spinning results come through the cleaning medium inside the vortex chamber.

It is also preferred that, alternatively or additionally, at least one, in particular one further, cleaning nozzle can be moved outside the vortex chamber and/or by means of a pivoting device between a rest position and a cleaning position for cleaning the yarn-forming element, thereby enabling the spinning position to operate particularly smoothly. The movement between the rest position and the cleaning position is preferably a displacement, in particular an extension, and/or a folding over or pivoting. In particular, an advantageous embodiment of the spinning station with several cleaning nozzles is conceivable, with all cleaning nozzles preferably being stationary or movable or preferably at least one stationary cleaning nozzle and at least one movable cleaning nozzle for cleaning a yarn-forming element.

In an advantageous further development of the spinning position, the cleaning nozzle can be positioned and aligned, in particular by means of the pivoting device, in such a way that the yarn-forming element in the cleaning position can be exposed to the cleaning medium frontally and/or laterally, at least over part of the surface, as a result of which cleaning of the yarn-forming element is achieved in a particularly simple manner can be. In this case, frontally means in particular in a direction along a yarn withdrawal channel and/or in the direction of a tip of the yarn-forming element. Laterally means in particular from one side orthogonal to a yarn withdrawal channel arranged centrally in the yarn formation element and/or aligned towards a part of a preferably conical side surface of the yarn formation element.

Particularly preferred is an advantageous development of the spinning station in which the cleaning nozzle can be rotated at least in sections, preferably completely around the yarn-forming element, in particular by means of the pivoting device, in order to be able to apply the cleaning medium to the entire surface of the yarn-forming element, in particular a spinning cone surface, during rotation . The cleaning nozzle can be rotated perpendicularly to a central longitudinal axis or a yarn draw-off channel of the yarn-forming element, or at a constant or variable angle, with rotation along a circular path or along a section of a circle being preferred becomes.

A preferred embodiment of the method for cleaning a yarn-forming element provides that the cleaning nozzle for cleaning the yarn-forming element is moved by means of a pivoting device from a rest position to a cleaning position and/or from the cleaning position to the rest position after cleaning. In principle, this movement into the cleaning position can take place at any time. It is conceivable that the yarn-forming element is moved into the cleaning position by initiating the process of opening the air spinning nozzle, during the opening of the air spinning nozzle and/or after the opening of the air spinning nozzle. However, it is preferable for the yarn-forming element to be moved into the cleaning position in such a way that the cleaning nozzle is in the cleaning position before or at the end of the opening process, as a result of which particularly time-efficient cleaning is possible.

In principle, the cleaning can take place at any time and be repeated as often as you like. A preferred embodiment of the method for cleaning a yarn-forming element provides that a yarn-forming element is cleaned in the course of a spinning interruption, for example after at least one or each thread breakage, after at least one or each cut of the yarn, during removal of a take-up package wound up by means of the air-spun yarn and/or or during a change of a sliver can from which the sliver is fed to the spinning station. Cleaning after a thread breakage makes it possible, in particular, for contamination as a possible reason for a thread breakage to be eliminated before the air-jet spinning process is resumed. Cleaning after the yarn has been cut, while the take-up bobbin is being removed or a new empty tube is being inserted in the winding device and during a sliver can change ensures consistently high yarn quality and strength, as does cleaning after a yarn breakage. Alternatively or additionally, cleaning can also be carried out periodically with defined identical or mutually different interval sections, in particular based on the operating time of the spinning position, the number of thread breaks, the number of cuts of the yarn, the number of take-up bobbins removed or the number of empty tubes used, the number of Spinning can changes, generally the number of spinning interruptions or spinning stops, are carried out in order to ensure regular cleaning ensure or avoid longer periods without being able to clean. Furthermore, as an alternative or in addition, cleaning can take place before the spinning station is put into operation after a defined downtime and/or before the spinning station is shut down in preparation for a defined downtime. This also ensures that when the spinning process is resumed, these disruptive deposits in the air spinning nozzle are minimized or eliminated as far as possible.

A preferred embodiment of the method for cleaning a yarn-forming element provides that the yarn-forming element is cleaned by means of a cleaning liquid, in particular by means of an aqueous cleaning liquid, an aerosol, a foam, an emulsion or a gas as the cleaning medium. A suitable selection of the cleaning medium allows cleaning and, in particular, additional treatment of the surface of the yarn-forming element as required. For example, in addition to a cleaning effect, a defined layer with a defined effect can be applied to the surface of the yarn-forming element in particular by means of an aerosol, foam or an emulsion, which can have an advantageous effect on the spinning process. For example, the yarn-forming element can be provided with an anti-stick layer which at least reduces, at best prevents, adhesion of particles to the yarn-forming element for a certain period of time. As a result, cleaning cycles of the yarn-forming element can be lengthened.

The use of a cleaning liquid as well as an aerosol enables a particularly thorough and, above all, quick cleaning. A cleaning liquid is any liquid which has a liquid content of preferably at least 90%, particularly preferably at least 95% and very particularly preferably at least 98%. The liquid can particularly preferably be water. The cleaning medium can likewise preferably contain at least one cleaning and/or surface-active substance, in particular at least one surfactant.

Although in principle a one-step cleaning by means of the cleaning medium is conceivable, in a preferred embodiment of the method for cleaning a yarn-forming element, a cleaning liquid, an aerosol, a foam or an emulsion to remove deposits and subsequently, in a second cleaning step, a gas stream is directed onto the yarn-forming element in order to remove the moisture from the surface of the yarn-forming element and/or to dry it, with such preferred cleaning particularly preferably being carried out using the same cleaning nozzle can. In this case, cleaning by means of a gas flow can be carried out both by a continuous gas flow and by one or more gas blasts or pulses.

In addition, an advantageous embodiment of the method for cleaning a yarn-forming element is also conceivable, in which the yarn-forming element is cleaned first by means of a gas stream to remove loose particles from the surface, then by means of a cleaning liquid, an aerosol, a foam or an emulsion to loosen adhering particles and preferably finally again by means of a gas flow for the final cleaning and/or drying of the surface of the yarn-forming element. Alternatively, however, the second gas stream can also be dispensed with if necessary in order to keep the surface of the yarn-forming element moist and thereby achieve greater strength of the yarn produced by means of the yarn-forming element due to an increased force acting on the surface of the yarn-forming element.

According to a further aspect of the present invention, the spinning station can be included in a working station of the air-jet spinning machine. A work station is any position on the air-jet spinning machine at which an air-spun spun thread or yarn is produced by means of the spinning station from a fiber sliver fed to the spinning station and is wound up via a winding device downstream of the spinning station in the yarn path for winding a package, in particular a cross-wound bobbin . The sliver can be fed in via a central sliver store assigned to the air-jet spinning machine or via a sliver store assigned to the individual spinning station, such as a sliver can in particular, in which a defined quantity of sliver is stored so that it can be removed from the sliver can. The work station can have further sliver or thread treatment devices for the defined and needs-based treatment of the sliver or thread. The workplace can have sensors for monitoring the sliver feed and/or the sliver parameters as well as or alternatively for monitoring the yarn take-off, the yarn feed to the winding device, the yarn parameters, for cleaning up yarn defects and/or for piecing after a sliver or yarn break or after a sliver can change or a take-up package removal. Furthermore, sensors or other devices in the area of the drafting system can be assigned to the work station, by means of which the sliver can be defined and drawn as required and/or provided with additional fibers, in particular made of a different fiber material, a so-called core yarn.

Fig. 1

eine schematische, querschnittliche Ansicht einer ersten Ausführung einer Spinnstelle einer Luftspinnmaschine mit einer Luftspinndüse in einem geschlossenen Zustand zur Garnbildung,

Fig. 2

eine schematische, querschnittliche Ansicht der in Figur 1 dargestellten Spinnstelle mit einer Luftspinndüse in einem geöffneten Zustand zur Reinigung,

Fig. 3

eine schematische, querschnittliche Ansicht einer zweiten Ausführung einer Spinnstelle einer Luftspinnmaschine mit einer Luftspinndüse in einem geschlossenen Zustand zur Garnbildung, und

Fig. 4

eine schematische, querschnittliche Ansicht der in Figur 3 dargestellten Spinnstelle mit einer Luftspinndüse in einem geöffneten Zustand zur Reinigung.

Several exemplary embodiments of a spinning position according to the present invention are explained in more detail below with reference to the drawings. The same reference numbers are used for the same components. In the figures show:

1

a schematic, cross-sectional view of a first embodiment of a spinning position of an air-jet spinning machine with an air-spinning nozzle in a closed state for yarn formation,

2

a schematic, cross-sectional view of in figure 1 spinning station shown with an air spinning nozzle in an open state for cleaning,

3

a schematic, cross-sectional view of a second embodiment of a spinning station of an air-jet spinning machine with an air-spinning nozzle in a closed state for yarn formation, and

4

a schematic, cross-sectional view of in figure 3 spinning station shown with an air spinneret in an open state for cleaning.

A first in the figures 1 and 2 The illustrated embodiment of a spinning station 1 of an air-jet spinning machine has an air-spinning nozzle 2 in which a spinning cone is arranged as a yarn-forming element 4 within a turbulence chamber 3 . In order to be able to produce a yarn by air spinning using the spinning station 1, a sliver is first drafted using a multi-roller drafting system and the resulting stretched sliver is subsequently fed to the air spinning nozzle 2 via a sliver inlet 7 . According to this preferred exemplary embodiment, the sliver is, after introduction via the sliver inlet 7, about a sliver transport direction extending in a previously known manner in the direction of the yarn-forming element 4, approximately up to the outlet of the latter Needle 8 out. As an alternative to the needle 8, a well-known pair of tweezers can be arranged according to a further preferred embodiment. Inside the turbulence chamber 3 of the air spinning nozzle 2, the outer fibers of the sliver are wound around an internal fiber core by means of a turbulent air flow generated by air spinning nozzles 2 in the area of an inlet opening of the air spinning nozzle 2, so that an air-yarn-specific yarn structure of a parallel yarn core and winding fibers lying at a certain angle result, which are decisive for the desired strength of the yarn.

If a synthetic fiber material is used for air-spinning the yarn, over time individual, detached fibers, fiber residues and possibly auxiliary materials accumulate on the surface of the yarn-forming element 4, which can reduce the quality and strength of the spun yarn.

In order to prevent this, a stationary cleaning nozzle 5 is arranged outside the vortex chamber 3 in the area of the spinning position 1, whereby this does not influence the air spinning process in the closed air spinning nozzle 2 due to its arrangement (see Fig figure 1 ). However, if the air spinning nozzle 2 is opened, for example after a thread breaks or the spun yarn has been cut, the yarn forming element 4 is moved into a cleaning position when the air spinning nozzle 2 opens, in which an outlet opening of the stationary cleaning nozzle 5 is aligned with a side surface of the yarn forming element 4. so that the surface of the yarn-forming element 4 can be cleaned by means of the cleaning nozzle 5 (see figure 2 ).

According to this first embodiment, at least one aqueous cleaning liquid is atomized by means of the cleaning nozzle 5 and directed as a spray onto the yarn-forming element 4 so that the deposits adhering to the surface of the yarn-forming element 4 can be removed.

However, such a cleaning preferably takes place by means of a cleaning cycle that can be carried out once or repeated several times. A first possible cleaning cycle provides that first a cleaning liquid for removing deposits is sprayed onto the surface of the yarn-forming element 4 by means of the cleaning nozzle 5 and then also by means of the Cleaning nozzle 5, a compressed air pulse is directed onto the surface of the yarn-forming element 4 in order to remove the mixture of the cleaning liquid and the loosened adhesions and to dry the surface of the yarn-forming element 4. As an alternative to this, according to a further embodiment, instead of the cleaning liquid, a foam is applied via the cleaning nozzle 5 to the surface of the yarn-forming element 4, with the foam being mixed with a non-stick liquid. The yarn-forming element 4 with the anti-adhesion liquid applied thereto is dried by means of the subsequent pulse of compressed air.

In an alternative cleaning cycle, a pulse of compressed air is first directed at the surface of the yarn-forming element 4 in order to remove loose buildup. This is followed by cleaning using a cleaning medium such as the cleaning liquid in order to remove the buildup that has not been loosened by the compressed air. Finally, the mixture of the cleaning liquid and the loosened adhesions is preferably also removed and the surface of the yarn-forming element 4 is dried by means of renewed application of compressed air. The same cleaning nozzle 5 is preferably used for all cleaning steps.

A second, in the Figures 3 and 4 The illustrated embodiment of a spinning station 1 of an air-jet spinning machine differs significantly from the first embodiment in that instead of a stationary cleaning nozzle 5, two movable cleaning nozzles 5a, 5b are provided.

A first cleaning nozzle 5a is arranged to be linearly displaceable in the direction of a side surface of the yarn-forming element 4, this cleaning nozzle 5a also being linearly in a cleaning position is shifted and thus at least one cleaning medium, in particular a cleaning liquid, an aerosol, a foam, an emulsion or a gas, can be applied to the yarn-forming element 4 in the immediate vicinity of the surface of the yarn-forming element 4 .

In addition, this cleaning nozzle 5a can also at least partially surround the Yarn formation element 4 can be pivoted around so that a cleaning fluid can be applied along the circumference of the surface of the yarn formation element 4 .

The second cleaning nozzle 5b can be moved both linearly and by means of a pivoting device 6 (in figure 4 shown only schematically by an arrow) on the surface of the Garnbildungselements 4 pivotally arranged. The second cleaning nozzle 5b is already linearly displaced during the opening of the air spinning nozzle 2 and the associated positioning of the yarn-forming element 4 in a cleaning position. After the yarn-forming element 4 has reached the cleaning position, the cleaning nozzle 5b is then pivoted by means of the pivoting device 6 in the direction of the surface of the yarn-forming element 4, so that cleaning can take place by means of both cleaning nozzles 5a, 5b.

In the case of cleaning by means of a plurality of cleaning nozzles 5a, 5b, cleaning can be carried out with all cleaning nozzles 5 at the same time, or the cleaning nozzles 5a, 5b can be used for cleaning one after the other. In addition, it is also conceivable that both cleaning nozzles do not use the same cleaning medium at the same time or immediately one after the other, but instead a cleaning cycle that is independent of the other cleaning nozzles 5b, 5a can also be carried out using each cleaning nozzle 5a, 5b.

Reference List

1

spinning position

2

air spinneret

3

vortex chamber

4

yarn forming element

5

cleaning nozzle

6

swivel device

7

sliver input

8th

needle

Claims (15)

Spinning station (1) of an air-jet spinning machine, with - An air spinning nozzle (2) with a yarn forming element (4) arranged within a turbulence chamber (3) for producing a yarn from a fiber sliver fed to the air spinning nozzle (2), wherein - the air spinning nozzle (2) can be transferred from a closed state for yarn formation into an open state in which the yarn-forming element (4) can be cleaned, - A cleaning nozzle (5; 5a; 5b) for cleaning the yarn formation element (4) in the open state of the air spinning nozzle (2), wherein - The cleaning nozzle (5; 5a; 5b) is designed in such a way that at least in the open state of the air spinning nozzle (2) the yarn-forming element (4) can be acted upon by a cleaning medium. Spinning position (1) of an air-jet spinning machine according to Claim 1, characterized in that at least one cleaning nozzle (5; 5a; 5b) is arranged outside the turbulence chamber (3) and/or in a stationary manner. Spinning position (1) of an air-jet spinning machine according to Claim 1 or 2, characterized in that at least one cleaning nozzle (5a; 5b) outside the turbulence chamber (3) and/or by means of a pivoting device (6) at least between a rest position and a cleaning position for cleaning the yarn-forming element (4) is movable. Spinning position (1) of an air-jet spinning machine according to Claim 3, characterized in that the cleaning nozzle (5a; 5b) can be positioned and aligned by means of the pivoting device (6) in such a way that the yarn-forming element (4) in the cleaning position is frontal and/or lateral at least over part of the area can be acted upon by the cleaning medium. Spinning station (1) of an air-jet spinning machine according to Claim 3 or 4, characterized in that the cleaning nozzle (5a; 5b) can be swiveled by means of the pivoting device (6) is rotatable at least partially circumferentially around the yarn-forming element (4). Spinning station (1) according to one of Claims 3 to 5, characterized in that the cleaning nozzle (5a; 5b) can be moved in at least two mutually different directions relative to the yarn-forming element (4) by means of the pivoting device (6). A method for cleaning a yarn-forming element (4) of an air-spinning nozzle with the yarn-forming element (4) arranged within a turbulence chamber (3) for producing a yarn from a sliver fed to the air-spinning nozzle (2), wherein the air-spinning nozzle (2) changes from a closed state for yarn formation in can be converted into an open state, in which the yarn-forming element (4) can be cleaned, with the steps: - opening of the air spinning nozzle (2) to make accessible the yarn forming element (4) arranged in the vortex chamber (3), - moving the yarn-forming element (4) and/or a cleaning nozzle (5; 5a; 5b) into a cleaning position, and - Subjecting the yarn-forming element (4) to at least one cleaning medium. Method according to Claim 7, characterized in that the cleaning nozzle (5; 5a; 5b) for cleaning the yarn-forming element (4) is moved by means of a pivoting device (6) from a rest position into a cleaning position for cleaning the yarn-forming element (4). Method according to Claim 7 or 8, characterized in that the movement of the yarn-forming element (4) and/or the cleaning nozzle (5; 5a; 5b) into the cleaning position is accompanied by an initiation of the opening process of the air-spinning nozzle (2) during the opening of the air-spinning nozzle ( 2) and/or after opening the air spinning nozzle (2). Method according to at least one of claims 7 to 9, characterized in that the yarn-forming element (4) is moved in such a way that the cleaning nozzle (5; 5a; 5b) is in the cleaning position at the end of the opening process. Method according to at least one of Claims 7 to 10, characterized in that cleaning of the yarn-forming element (4) in the course of a spinning interruption, for example after at least one thread breakage, after at least one cut of the yarn, during removal of a take-up package wound up by means of the air-spun yarn and/or or during a sliver can change. Method according to at least one of Claims 7 to 11, characterized in that an aqueous cleaning liquid, an aerosol, a foam, an emulsion or a gas is used as the cleaning medium. Method according to at least one of Claims 7 to 12, characterized in that either cleaning by means of a cleaning liquid, an aerosol, a foam or an emulsion then follows the yarn-forming element (4) in a second cleaning step with a gas stream or cleaning by means of a gas stream subsequently in in the second cleaning step, the yarn-forming element (4) is subjected to a cleaning liquid, an aerosol, a foam or an emulsion via the cleaning nozzle (5). Method according to at least one of Claims 7 to 13, characterized in that the yarn-forming element (4) is cleaned initially by means of a first gas stream to remove loose particles from the yarn-forming element (4), subsequently by means of a cleaning liquid, an aerosol, a foam or an emulsion to loosen adhering particles and then by means of a second gas stream for final cleaning and drying of the yarn-forming element (4). Method according to one of Claims 13 or 14, characterized in that the cleaning by means of the cleaning liquid, the aerosol, the foam or the emulsion and by means of the gas stream or the first and/or second gas stream is carried out by means of the same cleaning nozzle (5; 5a; 5b) take place.

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