EP3464691B1 - Yarn forming element for a pre-spinning machine and pre-spinning machine equipped therewith - Google Patents

Yarn forming element for a pre-spinning machine and pre-spinning machine equipped therewith Download PDF

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Publication number
EP3464691B1
EP3464691B1 EP17723523.1A EP17723523A EP3464691B1 EP 3464691 B1 EP3464691 B1 EP 3464691B1 EP 17723523 A EP17723523 A EP 17723523A EP 3464691 B1 EP3464691 B1 EP 3464691B1
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EP
European Patent Office
Prior art keywords
yarn
forming element
truncated cone
roving
fiber structure
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Application number
EP17723523.1A
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German (de)
French (fr)
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EP3464691A1 (en
Inventor
Petr Haska
Christian Griesshammer
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP3464691A1 publication Critical patent/EP3464691A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
    • D01H1/11—Spinning by false-twisting
    • D01H1/115—Spinning by false-twisting using pneumatic means
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/70—Constructional features of drafting elements
    • D01H5/72—Fibre-condensing guides
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/92—Spinning or twisting arrangements for imparting transient twist, i.e. false twist

Definitions

  • the present invention relates to a yarn-forming element for a roving machine, with which roving can be produced from a fiber structure with the aid of compressed air, the yarn-forming element comprising an inlet opening for the fibers of the fiber structure, and the yarn-forming element having an outlet for the outlet of the roving machine during operation the fiber structure in the region of the inlet opening of the yarn formation element and has a discharge channel connecting the inlet opening and the outlet.
  • a roving machine for producing a roving from a fiber structure with at least one spinning station having a whirlpool chamber with an inlet opening for the fiber structure and a yarn-forming element extending at least partially into the whirlpool chamber, and the spinning station having air nozzles directed into the whirlpool chamber via which air can be introduced into the vortex chamber in a predetermined direction of rotation in order to impart a rotation in said direction of rotation to the fiber structure fed via the inlet opening in the region of an inlet opening of the yarn-forming element.
  • Roving machines with corresponding spinning positions are known in the prior art and are used to produce a roving from an elongated fiber structure.
  • the outer fibers of the fiber structure are wound around the inner core fibers with the help of a turbulent air flow generated by the air nozzles inside the turbulence chamber in the area of the inlet opening of the yarn-forming element and thus form the core fibers that are decisive for the desired strength of the yarn.
  • B. can be wound onto a sleeve.
  • a spinning position of an air jet spinning machine for spinning a fiber structure to produce a yarn is known.
  • the spinning position points a pair of delivery rollers and a spinneret, the spinneret having a yarn-forming element and a fiber-guiding element.
  • the fiber guide element has a beginning facing the pair of delivery rollers and an end facing away from the pair of delivery rollers.
  • the fiber structure is fed to the spinneret with the pair of delivery rollers and introduced into the spinneret through the fiber guide element, and then a yarn is formed from the fiber structure by the yarn-forming element.
  • the spinning station has a turbulence chamber with an inlet opening for the fiber structure and a yarn-forming element that extends at least partially into the turbulence chamber.
  • the term roving (other designation: Lunte) to understand a fiber structure, in which at least a part of the fibers around a inner core are wound.
  • This type of yarn is characterized by the fact that, despite having a certain strength that is sufficient to transport the yarn to a subsequent textile machine, it is still capable of being drawn.
  • the roving can thus using a default device, z. B. the drafting system, a textile machine processing the roving, for example a ring spinning machine, before it is finally spun into a conventional yarn.
  • a fiber guide element is usually arranged, via which the fiber strand is guided into the spinneret and finally into the area of the yarn-forming element, with the yarn-forming elements generally being elongated structures with a internal discharge duct find use.
  • the geometry of the yarn-forming element In addition to the geometry of the vortex chamber and the strength and alignment of the individual air flows formed by the air nozzles, the geometry of the yarn-forming element also plays a decisive role in the quality of the roving.
  • the object of the present invention is therefore to propose a yarn-forming element and a roving machine equipped with it, which enables the production of a roving of particularly high quality.
  • the yarn-forming element is characterized in that it comprises an end face surrounding the inlet orifice, which at least partially has the shape of a truncated cone, with the top surface of the truncated cone being arranged between the base of the truncated cone and the outlet of the yarn-forming element.
  • the top surface of the truncated cone is understood to be the flat and circular surface of the truncated cone with the smaller radius and the base surface is understood to be the flat and circular surface of the truncated cone with the larger radius.
  • a corresponding truncated cone is shown in Figure 3a .
  • the yarn-forming element thus has an end face that is at least partially conical or funnel-shaped, with the funnel or cone or the above-mentioned truncated cone tapering in the direction of the outlet of the yarn-forming element.
  • a shape is produced, for example, by countersinking.
  • the angle between a generatrix of the truncated cone and its cone axis has a magnitude that is less than 90° and greater than 70°.
  • the cone axis is the axis of rotation of the truncated cone.
  • the generating line is a line that lies on the lateral surface of the truncated cone and is in a plane with the axis of the cone runs. Also in this context Figure 3a referenced, showing a corresponding truncated cone.
  • the end face should therefore have the shape of a relatively flat truncated cone, the height of which should be only between 2% and 20% of the diameter of the base area. If a slub of the roving reaches the area of the end face, which is thicker than the inner diameter of the discharge channel, the slub area in the area of the end face of the yarn forming element or the frustoconical section gets caught and can thus be easily removed.
  • the frustoconical area of the end face should merge directly into the discharge channel, so that the diameter or the cross-sectional shape of the discharge channel in this area corresponds to the diameter or the shape of the top surface of the truncated cone.
  • the discharge channel has a longitudinal axis and the longitudinal axis and said cone axis run parallel or collinear to one another.
  • the discharge duct is preferably rotationally symmetrical, in which case the longitudinal axis would correspond to the axis of rotation of the discharge duct.
  • the stated mutual arrangement of the longitudinal axis and cone axis ensures that a plane resting on the end face of the yarn-forming element runs perpendicular to the longitudinal axis of the discharge channel, along which the roving moves in the direction of the outlet of the yarn-forming element.
  • the discharge channel has an inner diameter in a region adjoining the inlet opening or the truncated cone, the amount of which is 4 mm to 12 mm, preferably 6 mm to 8 mm. If the specified diameter limits are observed, a particularly advantageous air flow occurs in the area of the inlet opening of the yarn-forming element, which causes only part of the outer fiber ends to be caught and wrapped around the actual fiber core with the desired strength. On the other hand, if the diameter is less than 4 mm, one gradually arrives in the range of the conventional Air spinning is known and results in a relatively strong yarn that is only partially suitable as a roving.
  • the air pressure of the air supplied via the air nozzles must be significantly increased in order to ensure the necessary turbulent flow within the turbulence chamber, since part of the incoming air leaves the turbulence chamber via the inlet opening of the yarn-forming element without going to the contribute to vortex formation.
  • a particularly advantageous roving can only be produced if the diameter deviates significantly from the values known from conventional air-jet spinning, which are between 0.5 and a maximum of 2.0 mm the centrally arranged core fibers are looped (thus providing the roving with a protective twist), with the proportion and strength of the wrapping fibers being only so high that the desired drafting of the roving is still possible in the course of the subsequent spinning process on a subsequent spinning machine.
  • the yarn-forming element has a cylindrical wall with a cylindrical outer surface and a cylindrical inner surface delimiting the discharge channel in the area of the inlet opening, the inner surface and the outer surface running concentrically.
  • the yarn-forming element therefore has at least one cylindrical section with a constant wall thickness in the area adjoining the end face.
  • the entire end face of the yarn-forming element which connects the outer surface and the inner surface, has the shape of a truncated cone.
  • the section of the yarn-forming element that has the inlet opening thus preferably has three surface sections, namely a surface section formed by the outer surface of the yarn-forming element, a surface section formed by the inner surface adjoining the inlet opening (and at least partially delimiting the discharge channel), and a surface section formed by the end face. which has the shape of a truncated cone.
  • the transition area between the end face and the discharge channel and/or the transition between the end face and an outer surface of the yarn-forming element is not sharp-edged, but rounded.
  • the radius of the rounded portions which should have a ring shape in a plan view of the end face of the yarn-forming element, should be between 0.1 mm and 2.0 mm.
  • the yarn-forming element has a chamfer in the area of the end face, which also has the shape of a truncated cone.
  • the bevel should preferably merge into the outer surface of the yarn-forming element and be spaced apart from the discharge channel by a frustoconical area on the end face of the yarn-forming element.
  • the base of the truncated cone forming the bevel is arranged between the top surface of this truncated cone and the outlet of the yarn-forming element.
  • the chamfer should thus form a truncated cone which is inverted with respect to the truncated cone described in claim 1.
  • the base of the truncated cone adjoining the discharge channel corresponds to the top surface of the truncated cone formed by the chamfer.
  • the two truncated cones therefore advantageously merge directly into one another.
  • the bevel encloses an angle ⁇ with a longitudinal axis of the discharge channel, the amount of which is between 20° and 70°, preferably between 30° and 60°. Furthermore, in a longitudinal section of the yarn-forming element, the bevel should enclose an angle of between 70° and 90° with the further frustoconical region mentioned in claim 1. If the chamfer is arranged between the discharge channel and the further area of the end face of the yarn-forming element, which forms a truncated cone, the stated angle should be greater than 140° and smaller than 180°.
  • the end face has at least one second frustoconical region in addition to a first frustoconical region, the second frusto-conical region surrounding the first frusto-conical region in a plan view of the end face of the yarn-forming element.
  • the cylindrical end of the yarn-forming element which also includes the inlet opening, is first machined with a countersink in such a way that the area mentioned in claim 1, which has the shape of a truncated cone, is created and then the transition area is provided with an annular chamfer between the face of the yarn-forming element and the outer surface of the yarn-forming element.
  • the second frustoconical area directly adjoins the first frustoconical area, with both frustoconical areas preferably running concentrically to one another. It is conceivable in this context that the base of the first frustoconical area forms the top surface of the second frustoconical area. Furthermore, it is advantageous if the diameter of the top surface of the first frustoconical area is smaller than the top surface of the second frustoconical area.
  • the smallest angle between a generatrix of the first frustoconical area and a longitudinal axis of the discharge channel has a different, preferably smaller, amount (e.g. 50° to 80°) than the smallest angle between a generatrix of the second frustoconical region and said longitudinal axis of the flue (which should be greater than 70° and less than 90°).
  • the yarn-forming element according to the invention is characterized in that at least a part, e.g. B. an annular region of an end face of the yarn-forming element, preferably the entire end face thereof, is inclined inwardly in the direction of the discharge channel in a longitudinal section of the yarn-forming element.
  • the present invention relates to a roving machine for producing a roving from a fiber structure with at least one spinning station, the spinning station having a turbulence chamber with an inlet opening for the fiber structure and a yarn forming element extending at least partially into the vortex chamber.
  • the spinning station also includes air nozzles directed into the whirl chamber, via which air can be introduced into the whirl chamber in a predetermined direction of rotation, in order to impart a rotation in said direction of rotation to the fiber structure fed via the inlet opening in the region of an inlet opening of the yarn-forming element.
  • the yarn-forming element has an outlet for the outlet of the roving and a discharge channel connecting the inlet opening and the outlet, through which the roving passes before exiting via the outlet.
  • the yarn-forming element is designed according to the previous or following description, with the individual features being able to be implemented in any combination, provided that this does not result in any contradictions.
  • figure 1 shows a schematic view of a section of a roving machine.
  • the roving machine can have a drafting system with several, each around a rotary axis 23 rotatable drafting system rollers 21 (only two of the six drafting system rollers 21 are provided with a reference number), the drafting system being supplied with a fiber structure 1, for example in the form of a doubled draw frame sliver, during the spinning operation.
  • the roving frame shown comprises one or more spinning nozzles 22 arranged adjacent to one another, each with an internal turbulence chamber 15 (see FIG figure 2 ), in which the fiber structure 1 or at least some of the fibers of the fiber structure 1 is provided with a twist (the precise mode of operation of the spinneret 22 is described in more detail below).
  • the roving machine can comprise a take-off device 24 with a plurality of interacting take-off rollers 31 and a winding device 25 downstream of the take-off rollers 31, with the aid of which the spinneret 22 can be fed via an outlet 4 (which at the same time is the outlet 4 of the, for example, in figure 2 closer shown discharge channel 5 forms) leaving roving 2 can be wound onto a sleeve 32 to form a coil, in which case a traversing element 20 can be used.
  • the roving machine according to the invention does not necessarily have to have a drafting system, as is shown in figure 1 is shown.
  • the take-off rollers 31 are also not absolutely necessary.
  • the roving machine works according to an air spinning process.
  • the fiber strand 1 is guided into the turbulence chamber 15 of the spinneret 22 via an inlet opening 16, in which a so-called fiber guide element is preferably arranged (see also figure 2 ).
  • a so-called fiber guide element is preferably arranged (see also figure 2 ).
  • Some of the fibers are pulled out of the fiber structure 1 at least a little and wound around the tip of a yarn-forming element 17 protruding into the eddy chamber 15 .
  • the draw-off channel 5 should also have an inside diameter D, the amount of which is in the above-mentioned range.
  • the roving 2 produced is a yarn with a relatively small proportion of twisted fibers, or a yarn in which the twisted fibers are wrapped relatively loosely around the inner core, so that the Roving 2 remains draftable.
  • a subsequent textile machine e.g. a ring spinning machine
  • a drafting system in order to be able to be further processed into a conventional yarn that can be processed into a fabric, for example on a weaving machine.
  • the air nozzles 18 it should also be mentioned at this point, purely as a precaution, that they should generally be aligned in such a way that they jointly generate a rectified air flow with a uniform direction of rotation.
  • the individual air nozzles 18 are preferably arranged rotationally symmetrically to one another.
  • the inclination of the air nozzles 18 in relation to the longitudinal axis L of the discharge channel 5 can be selected within certain limits.
  • the air nozzles 18 could run perpendicular to the longitudinal axis L mentioned (see in figure 2 air nozzle 18 shown on the left).
  • the yarn-forming element 17 is characterized in that said end face, which is part of the wall 30 of the yarn-forming element 17, is inclined slightly inward.
  • the yarn-forming element 17 comprises an end face 6 surrounding the inlet opening 3, which has the shape of a truncated cone 27 at least in sections, with the top surface 7 of the truncated cone 27 being arranged between the base 8 of the truncated cone 27 and the outlet 4 of the yarn-forming element 17.
  • the top surface 7 is the circular surface with the smaller radius and the base surface 8 is the circular surface with the larger radius.
  • the lateral surface 29 is the surface that connects the base surface 8 to the top surface 7 .
  • the generatrices 28 are the lines that lie on the lateral surface 29 and run in a plane with the cone axis K, which in turn represents the axis of rotation of the truncated cone 27 .
  • the yarn-forming element 17 according to the invention has an end face 6 which, at least in sections, has the above-mentioned truncated cone shape, with the Figure 3b Angle ⁇ shown between the longitudinal axis L of the discharge channel 5 and any surface line 28 of the truncated cone 27 has an amount that is greater than 70 ° and less than 90 °. Said area thus forms a relatively flat cone, which also has only a slight funnel effect.
  • the frustoconical area preferably forms the entire end face 6 of the Yarn-forming element 17, which surrounds the inlet opening 3 and which connects the inner surface 19 of the yarn-forming element 17, which delimits the discharge channel 5, and an outer surface 10 of the same, which preferably runs concentrically with said inner surface 19 (at least in a first area adjoining the end face 6).
  • a corresponding version is in Figure 3b shown.
  • transition 11 between the end face 6 of the yarn-forming element 17 and the aforementioned outer surface 10 of the same is rounded ( Figures 4a and 4b ).
  • transition area 9 between the end face 6 of the yarn-forming element 17 and the discharge channel 5 can also be rounded ( Figure 4b ).
  • the Figures 5a and 5b show solutions in which the end face 6 of the yarn-forming element 17 comprises, in addition to the area mentioned having the shape of a truncated cone 27 , a further area which also has the shape of a truncated cone 27 .
  • the end face 6 therefore preferably comprises a first frustoconical area 13 and a second frustoconical area 14.
  • the angle ⁇ between a surface line 28 of the first frustoconical area 13 and the longitudinal axis L of the discharge channel 5 is greater than the angle ⁇ between a surface line 28 of the second frustoconical area 14 and the longitudinal axis L of the discharge channel 5 ( Figure 5b ).
  • the opposite design can also be advantageous, as shown in Figure 5a is shown.
  • the Figures 6a and 6b show that the end face 6 of the yarn-forming element 17 can also be partially formed by a chamfer 12, the angle ⁇ between a surface line 28 of the truncated cone 27, which is described by the chamfer 12, and the longitudinal axis L of the discharge channel 5 preferably in the already in the range mentioned in the general description.
  • the chamfer 12 forms the second frustoconical region 14 described above.
  • the shape of the outer surface 10 of the yarn-forming element 17 and/or the shape of the inner surface 19 of the yarn-forming element 17 may deviate from the shape of a cylinder and/or have gradations.
  • FIG 8 A detail of a cross section through another spinneret 22.
  • the spinneret 22 also includes one or more piecing air nozzles 33, via which (likewise) Compressed air can be introduced into the vortex chamber 15.
  • the spinning nozzle 22 has special piecing air nozzles 33 which are fed with compressed air exclusively or together with the air nozzles 18 during a piecing process.
  • the piecing process is the initial sequence of roving production, in which the fiber structure 1 is introduced into the previously empty eddy chamber 15 and twisted there to form a roving 2 .
  • the roving section thus formed is taken over by a corresponding take-off device 24 after leaving the take-off channel 5 and is brought into contact with a rotating sleeve 32 while the supply and twisting of the fiber structure 1 continues.
  • This is followed by normal operation of the spinneret 22 , in which further roving 2 is continuously produced from the supplied fiber structure 1 and drawn off from the spinneret 22 .
  • the piecing air nozzles 33 should be inclined relative to the longitudinal axis L of the offtake duct 5 in order to be able to generate an air flow that extends at least a little way into the offtake duct 5 (the angle between the longitudinal axis L and a central axis of the piecing air nozzles 33 or their direction vectors should therefore deviate from 90°). This ultimately prevents air from flowing through the discharge channel 5 in the direction of its inlet opening 3 counter to the direction of movement of the roving 2 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Description

Die vorliegende Erfindung betrifft ein Garnbildungselement für eine Vorspinnmaschine, mit der aus einem Faserverband mit Hilfe von Druckluft Vorgarn herstellbar ist, wobei das Garnbildungselement eine Einlassmündung für die Fasern des Faserverbands umfasst, und wobei das Garnbildungselement einen Auslass für den Austritt des beim Betrieb der Vorspinnmaschine aus dem Faserverband im Bereich der Einlassmündung des Garnbildungselements hergestellten Vorgarns und einen die Einlassöffnung und den Auslass verbindenden Abzugskanal aufweist.The present invention relates to a yarn-forming element for a roving machine, with which roving can be produced from a fiber structure with the aid of compressed air, the yarn-forming element comprising an inlet opening for the fibers of the fiber structure, and the yarn-forming element having an outlet for the outlet of the roving machine during operation the fiber structure in the region of the inlet opening of the yarn formation element and has a discharge channel connecting the inlet opening and the outlet.

Darüber hinaus wird eine Vorspinnmaschine zur Herstellung eines Vorgarns aus einem Faserverband mit wenigstens einer Spinnstelle vorgeschlagen, wobei die Spinnstelle eine Wirbelkammer mit einer Einlauföffnung für den Faserverband und ein sich zumindest teilweise in die Wirbelkammer erstreckendes Garnbildungselement aufweist, und wobei die Spinnstelle in die Wirbelkammer gerichtete Luftdüsen umfasst, über die Luft in einer vorgegebenen Drehrichtung in die Wirbelkammer einbringbar ist, um dem über die Einlauföffnung zugeführten Faserverband im Bereich einer Einlassmündung des Garnbildungselements eine Drehung in der genannten Drehrichtung zu erteilen.In addition, a roving machine for producing a roving from a fiber structure with at least one spinning station is proposed, the spinning station having a whirlpool chamber with an inlet opening for the fiber structure and a yarn-forming element extending at least partially into the whirlpool chamber, and the spinning station having air nozzles directed into the whirlpool chamber via which air can be introduced into the vortex chamber in a predetermined direction of rotation in order to impart a rotation in said direction of rotation to the fiber structure fed via the inlet opening in the region of an inlet opening of the yarn-forming element.

Vorspinnmaschinen mit entsprechenden Spinnstellen sind im Stand der Technik bekannt und dienen der Herstellung eines Vorgarns aus einem länglichen Faserverband. Die äußeren Fasern des Faserverbands werden hierbei mit Hilfe einer durch die Luftdüsen innerhalb der Wirbelkammer erzeugten Wirbelluftströmung im Bereich der Einlassmündung des Garnbildungselements um die innenliegenden Kernfasern gewunden und bilden hierdurch die für die gewünschte Festigkeit des Garns ausschlaggebenden Umwindefasern. Hierdurch entsteht ein Vorgarn mit einer echten Drehung, welches schließlich über einen Abzugskanal aus der Wirbelkammer abgeführt und z. B. auf eine Hülse aufgewickelt werden kann.Roving machines with corresponding spinning positions are known in the prior art and are used to produce a roving from an elongated fiber structure. The outer fibers of the fiber structure are wound around the inner core fibers with the help of a turbulent air flow generated by the air nozzles inside the turbulence chamber in the area of the inlet opening of the yarn-forming element and thus form the core fibers that are decisive for the desired strength of the yarn. This creates a roving with a real twist, which is finally discharged via a discharge channel from the vortex chamber and z. B. can be wound onto a sleeve.

Aus der EP2767624A1 ist eine Spinnstelle einer Luftdüsenspinnmaschine zum Verspinnen eines Faserverbandes zur Herstellung eines Garns bekannt. Die Spinnstelle weist ein Lieferwalzenpaar und eine Spinndüse auf, wobei die Spinndüse ein Garnbildungselement und ein Faserführungselement aufweist. Das Faserführungselement hat ein dem Lieferwalzenpaar zugewandten Anfang und ein dem Lieferwalzenpaar abgewandten Ende. Der Faserverband wird mit dem Lieferwalzenpaar der Spinndüse zugeführt und durch das Faserführungselement in die Spinndüse eingeführt und anschliessend wird durch das Garnbildungselement aus dem Faserverband ein Garn gebildet.From the EP2767624A1 a spinning position of an air jet spinning machine for spinning a fiber structure to produce a yarn is known. The spinning position points a pair of delivery rollers and a spinneret, the spinneret having a yarn-forming element and a fiber-guiding element. The fiber guide element has a beginning facing the pair of delivery rollers and an end facing away from the pair of delivery rollers. The fiber structure is fed to the spinneret with the pair of delivery rollers and introduced into the spinneret through the fiber guide element, and then a yarn is formed from the fiber structure by the yarn-forming element.

Aus der DE102012108613A1 ist eine Spinnstelle einer Vorspinnmaschine zur Herstellung eines Vorgarns aus einem Faserverband bekannt. Die Spinnstelle weist eine Wirbelkammer mit einer Einlauföffnung für den Faserverband und ein sich zumindest teilweise in die Wirbelkammer erstreckendes Garnbildungselement auf.From the DE102012108613A1 a spinning position of a roving machine for producing a roving from a fiber structure is known. The spinning station has a turbulence chamber with an inlet opening for the fiber structure and a yarn-forming element that extends at least partially into the turbulence chamber.

Generell ist im Sinne der Erfindung unter dem Begriff Vorgarn (andere Bezeichnung:
Lunte) ein Faserverband zu verstehen, bei dem zumindest ein Teil der Fasern um einen innenliegenden Kern gewunden sind. Diese Art Garn zeichnet sich dadurch aus, dass sie trotz einer gewissen Festigkeit, die ausreicht, um das Garn zu einer nachfolgenden Textilmaschine zu transportieren, noch immer verzugsfähig ist. Das Vorgarn kann also mit Hilfe einer Verzugseinrichtung, z. B. dem Streckwerk, einer das Vorgarn verarbeitenden Textilmaschine, beispielsweise einer Ringspinnmaschine, verzogen werden, bevor es endgültig zu einem herkömmlichen Garn versponnen wird.In general, within the meaning of the invention, the term roving (other designation:
Lunte) to understand a fiber structure, in which at least a part of the fibers around a inner core are wound. This type of yarn is characterized by the fact that, despite having a certain strength that is sufficient to transport the yarn to a subsequent textile machine, it is still capable of being drawn. The roving can thus using a default device, z. B. the drafting system, a textile machine processing the roving, for example a ring spinning machine, before it is finally spun into a conventional yarn.

Im Bereich des Einlasses der Spinndüse der Spinnstelle, in der die Vorgarnherstellung erfolgt, ist in der Regel ein Faserführungselement angeordnet, über welches der Faserverband in die Spinndüse und schließlich in den Bereich des Garnbildungselements geführt wird, wobei als Garnbildungselemente in der Regel längliche Gebilde mit einem innenliegenden Abzugskanal Verwendung finden.In the area of the inlet of the spinneret of the spinning station in which the roving is produced, a fiber guide element is usually arranged, via which the fiber strand is guided into the spinneret and finally into the area of the yarn-forming element, with the yarn-forming elements generally being elongated structures with a internal discharge duct find use.

Im Bereich der die Einlassmündung umgebenden Stirnseite des Garnbildungselements wird Druckluft über die Luftdüsen in die Wirbelkammer eingebracht, so dass sich letztendlich durch die entsprechende Ausrichtung der Luftdüsen die genannte rotierende Wirbelluftströmung ergibt. Dies führt dazu, dass aus dem das Faserführungselement verlassenden Faserverband einzelne außenliegende Fasern abgetrennt bzw. ein Stück weit aus dem Faserverband herausgezogen und über die Stirnseite des Garnbildungselements umgeschlagen werden. Im weiteren Verlauf rotieren diese Fasern auf der Oberfläche des Garnbildungselements. In der Folge werden durch die Vorwärtsbewegung der innenliegenden Kernfasern des Faserverbandes die rotierenden Fasern um die Kernfasern gewunden und dadurch das Vorgarn gebildet.In the area of the end face of the yarn-forming element surrounding the inlet opening, compressed air is introduced into the turbulence chamber via the air nozzles, so that ultimately the named rotating turbulence air flow results from the appropriate alignment of the air nozzles. As a result, individual outer fibers are separated from the fiber structure leaving the fiber guide element or are pulled out of the fiber structure a little and folded over the end face of the yarn-forming element. As they progress, these fibers rotate on the surface of the yarn-forming element. As a result, the rotating fibers are wound around the core fibers by the forward movement of the inner core fibers of the fiber structure, thereby forming the roving.

Für die Qualität des Vorgarns spielt nun neben der Geometrie der Wirbelkammer und der Stärke und Ausrichtung der einzelnen, durch die Luftdüsen gebildeten, Luftströmungen, auch die Geometrie des Garnbildungselements eine entscheidende Rolle.In addition to the geometry of the vortex chamber and the strength and alignment of the individual air flows formed by the air nozzles, the geometry of the yarn-forming element also plays a decisive role in the quality of the roving.

Aufgabe der vorliegenden Erfindung ist es daher, ein Garnbildungselement und eine damit ausgerüstete Vorgarnmaschine vorzuschlagen, die die Herstellung eines Vorgarns mit besonders hoher Qualität ermöglicht.The object of the present invention is therefore to propose a yarn-forming element and a roving machine equipped with it, which enables the production of a roving of particularly high quality.

Die Aufgabe wird gelöst durch ein Garnbildungselement sowie eine Vorspinnmaschine mit den Merkmalen des unabhängigen Patentanspruchs.The object is achieved by a yarn forming element and a roving machine with the features of the independent patent claim.

Erfindungsgemäß zeichnet sich das Garnbildungselement nun dadurch aus, dass es eine die Einlassmündung umgebende Stirnseite umfasst, die zumindest abschnittsweise die Form eines Kegelstumpfs aufweist, wobei die Deckfläche des Kegelstumpfs zwischen der Grundfläche des Kegelstumpfs und dem Auslass des Garnbildungselements angeordnet ist. Wie üblich, wird auch im Rahmen der vorliegenden Erfindung unter der Deckfläche des Kegelstumpfs diejenige ebene und kreisrunde Fläche des Kegelstumpfs mit dem kleineren Radius und unter der Grundfläche diejenige ebene und kreisrunde Fläche des Kegelstumpfs mit dem größeren Radius verstanden. Dargestellt ist ein entsprechender Kegelstumpf in Figur 3a.According to the invention, the yarn-forming element is characterized in that it comprises an end face surrounding the inlet orifice, which at least partially has the shape of a truncated cone, with the top surface of the truncated cone being arranged between the base of the truncated cone and the outlet of the yarn-forming element. As usual, within the scope of the present invention, the top surface of the truncated cone is understood to be the flat and circular surface of the truncated cone with the smaller radius and the base surface is understood to be the flat and circular surface of the truncated cone with the larger radius. A corresponding truncated cone is shown in Figure 3a .

Das Garnbildungselement besitzt also eine Stirnseite, die zumindest bereichsweise konus- bzw. trichterförmig ausgebildet ist, wobei sich der Trichter bzw. Konus bzw. der oben genannte Kegelstumpf in Richtung des Auslasses des Garnbildungselements verjüngt. Hergestellt wird eine derartige Form beispielsweise durch Senkbohren.The yarn-forming element thus has an end face that is at least partially conical or funnel-shaped, with the funnel or cone or the above-mentioned truncated cone tapering in the direction of the outlet of the yarn-forming element. Such a shape is produced, for example, by countersinking.

Durch die genannte Form des die Einlassmündung umgebenden Bereichs erhält man eine Stirnseite, die in einer Draufsicht den Abzugskanal ringförmig umgibt und die aufgrund der Trichterwirkung ein sanftes Einlaufen des Vorgarns in den Abzugskanal sicherstellt. Es hat sich gezeigt, dass die Bildung der oben genannten Umwindefasern hierdurch verbessert wird und die Qualität des Vorgarns, insbesondere dessen Gleichmäßigkeit, zunimmt.The stated shape of the area surrounding the inlet opening results in an end face which, in a top view, surrounds the discharge channel in a ring shape and which, due to the funnel effect, ensures that the roving enters the discharge channel gently. It has been shown that the formation of the above-mentioned twisted fibers is improved as a result and the quality of the roving, in particular its uniformity, increases.

Um nun zu verhindern, dass Dickstellen des Vorgarns (die z. B. durch Verunreinigungen des Faserverbands oder durch Bauchbinden des Vorgarns entstehen können) zu weit in den Abzugskanal gezogen werden, wird erfindungsgemäß vorgeschlagen, dass der Winkel zwischen einer Mantellinie des Kegelstumpfs und dessen Kegelachse einen Betrag aufweist, der kleiner als 90° und größer als 70° ist. Die Kegelachse ist hierbei die Rotationsachse des Kegelstumpfs. Bei der Mantellinie handelt es sich um eine Linie, die auf der Mantelfläche des Kegelstumpfs liegt und in einer Ebene mit der Kegelachse verläuft. Auch in diesem Zusammenhang wird auf Figur 3a verwiesen, die einen entsprechenden Kegelstumpf zeigt.In order to prevent slubs in the roving (which can be caused, for example, by contamination of the fiber structure or by bundling of the roving) being pulled too far into the discharge channel, it is proposed according to the invention that the angle between a generatrix of the truncated cone and its cone axis has a magnitude that is less than 90° and greater than 70°. The cone axis is the axis of rotation of the truncated cone. The generating line is a line that lies on the lateral surface of the truncated cone and is in a plane with the axis of the cone runs. Also in this context Figure 3a referenced, showing a corresponding truncated cone.

Mit anderen Worten sollte die Stirnseite also die Form eines relativ flachen Kegelstumpfs aufweisen, dessen Höhe lediglich zwischen 2 % und 20 % des Durchmessers der Grundfläche betragen sollte. Gelangt nun eine Dickstelle des Vorgarns in den Bereich der Stirnseite, die dicker ist als der Innendurchmesser des Abzugskanals, so bleibt die Dickstelle im Bereich der Stirnseite des Garnbildungselements bzw. des kegelstumpfförmigen Abschnitts hängen und kann somit leicht entfernt werden.In other words, the end face should therefore have the shape of a relatively flat truncated cone, the height of which should be only between 2% and 20% of the diameter of the base area. If a slub of the roving reaches the area of the end face, which is thicker than the inner diameter of the discharge channel, the slub area in the area of the end face of the yarn forming element or the frustoconical section gets caught and can thus be easily removed.

Im Übrigen sollte der kegelstumpfförmige Bereich der Stirnseite direkt in den Abzugskanal übergehen, so dass der Durchmesser bzw. die Querschnittsform des Abzugskanals in diesem Bereich dem Durchmesser bzw. der Form der Deckfläche des Kegelstumpfs entspricht.In addition, the frustoconical area of the end face should merge directly into the discharge channel, so that the diameter or the cross-sectional shape of the discharge channel in this area corresponds to the diameter or the shape of the top surface of the truncated cone.

Darüber hinaus bringt es Vorteile mit sich, wenn der Abzugskanal eine Längsachse aufweist und die Längsachse und die genannte Kegelachse parallel oder kolinear zueinander verlaufen. Der Abzugskanal ist vorzugsweise rotationssymmetrisch, wobei die Längsachse in diesem Fall der Rotationsachse des Abzugskanals entsprechen würde. Durch die genannte gegenseitige Anordnung von Längsachse und Kegelachse wird sichergestellt, dass eine auf der Stirnseite des Garnbildungselements aufliegende Ebene senkrecht zur Längsachse des Abzugskanals, entlang derer sich das Vorgarn in Richtung des Auslasses des Garnbildungselements bewegt, verläuft.In addition, there are advantages if the discharge channel has a longitudinal axis and the longitudinal axis and said cone axis run parallel or collinear to one another. The discharge duct is preferably rotationally symmetrical, in which case the longitudinal axis would correspond to the axis of rotation of the discharge duct. The stated mutual arrangement of the longitudinal axis and cone axis ensures that a plane resting on the end face of the yarn-forming element runs perpendicular to the longitudinal axis of the discharge channel, along which the roving moves in the direction of the outlet of the yarn-forming element.

Besondere Vorteile bringt es mit sich, wenn der Abzugskanal in einem sich an die Einlassmündung bzw. den Kegelstumpf anschließenden Bereich einen Innendurchmesser aufweist, dessen Betrag 4 mm bis 12 mm, vorzugsweise 6 mm bis 8 mm, beträgt. Bei Einhaltung der genannten Durchmessergrenzen entsteht eine besonders vorteilhafte Luftströmung im Bereich der Einlassmündung des Garnbildungselements, die bewirkt, dass lediglich ein Teil der äußeren Faserenden erfasst und mit der gewünschten Festigkeit um den eigentlichen Faserkern geschlungen werden. Liegt der Durchmesser hingegen unterhalb von 4 mm, so gelangt man allmählich in den Bereich, der vom herkömmlichen Luftspinnen bekannt ist und der in einem relativ festen Garn resultiert, das als Vorgarn nur bedingt geeignet ist. Wählt man hingegen einen Durchmesser von über 12 mm, so muss der Luftdruck der über die Luftdüsen zugeführten Luft signifikant erhöht werden, um die nötige Wirbelströmung innerhalb der Wirbelkammer sicherzustellen, da ein Teil der einströmenden Luft die Wirbelkammer über die Einlassmündung des Garnbildungselements verlässt, ohne zur Wirbelbildung beizutragen.There are particular advantages if the discharge channel has an inner diameter in a region adjoining the inlet opening or the truncated cone, the amount of which is 4 mm to 12 mm, preferably 6 mm to 8 mm. If the specified diameter limits are observed, a particularly advantageous air flow occurs in the area of the inlet opening of the yarn-forming element, which causes only part of the outer fiber ends to be caught and wrapped around the actual fiber core with the desired strength. On the other hand, if the diameter is less than 4 mm, one gradually arrives in the range of the conventional Air spinning is known and results in a relatively strong yarn that is only partially suitable as a roving. If, on the other hand, a diameter of more than 12 mm is selected, the air pressure of the air supplied via the air nozzles must be significantly increased in order to ensure the necessary turbulent flow within the turbulence chamber, since part of the incoming air leaves the turbulence chamber via the inlet opening of the yarn-forming element without going to the contribute to vortex formation.

Erst durch die signifikante Abweichung des Durchmessers von den vom herkömmlichen Luftspinnen bekannten Werten, die zwischen 0,5 und maximal 2,0 mm liegen, lässt sich jedoch ein besonders vorteilhaftes Vorgarn herstellen, das sich dadurch auszeichnet, dass ein Teil der Fasern als Umwindefasern um die mittig angeordneten Kernfasern geschlungen werden (und das Vorgarn damit mit einer Schutzdrehung versehen), wobei der Anteil und die Festigkeit der Umwindefasern nur so hoch ist, dass im Verlauf des anschließenden Spinnprozesses an einer nachfolgenden Spinnmaschine auch weiterhin der gewünschte Verzug des Vorgarns möglich ist.However, a particularly advantageous roving can only be produced if the diameter deviates significantly from the values known from conventional air-jet spinning, which are between 0.5 and a maximum of 2.0 mm the centrally arranged core fibers are looped (thus providing the roving with a protective twist), with the proportion and strength of the wrapping fibers being only so high that the desired drafting of the roving is still possible in the course of the subsequent spinning process on a subsequent spinning machine.

Ebenso ist es vorteilhaft, wenn das Garnbildungselement im Bereich der Einlassmündung eine zylindrische Wandung mit einer zylindrischen Außenfläche und einer zylindrischen, den Abzugskanal begrenzenden, Innenfläche aufweist, wobei die Innenfläche und die Außenfläche konzentrisch verlaufen. Das Garnbildungselement besitzt also in dem sich an die Stirnseite anschließenden Bereich zumindest einen zylindrischen Abschnitt mit konstanter Wanddicke.It is also advantageous if the yarn-forming element has a cylindrical wall with a cylindrical outer surface and a cylindrical inner surface delimiting the discharge channel in the area of the inlet opening, the inner surface and the outer surface running concentrically. The yarn-forming element therefore has at least one cylindrical section with a constant wall thickness in the area adjoining the end face.

Ebenso ist es von Vorteil, wenn die gesamte, die Außenfläche und die Innenfläche verbindende, Stirnseite des Garnbildungselements die Form eines Kegelstumpfs aufweist. Der die Einlassmündung aufweisende Abschnitt des Garnbildungselements besitzt somit vorzugsweise drei Flächenabschnitte, nämlich einen durch die Außenfläche des Garnbildungselements gebildeten Flächenabschnitt, einen durch die sich an die Einlassmündung anschließende (und den Abzugskanal zumindest teilweise begrenzenden) Innenfläche gebildeten Flächenabschnitt und einen durch die Stirnseite gebildeten Flächenabschnitt, der die Form eines Kegelstumpfs aufweist.It is also advantageous if the entire end face of the yarn-forming element, which connects the outer surface and the inner surface, has the shape of a truncated cone. The section of the yarn-forming element that has the inlet opening thus preferably has three surface sections, namely a surface section formed by the outer surface of the yarn-forming element, a surface section formed by the inner surface adjoining the inlet opening (and at least partially delimiting the discharge channel), and a surface section formed by the end face. which has the shape of a truncated cone.

Ebenso kann es Vorteile mit sich bringen, wenn der Übergangsbereich zwischen der Stirnseite und dem Abzugskanal und/oder der Übergang zwischen der Stirnseite und einer Außenfläche des Garnbildungselements nicht scharfkantig, sondern abgerundet ist. Der Radius der abgerundeten Abschnitte, die in einer Draufsicht auf die Stirnseite des Garnbildungselements eine Ringform aufweisen sollten, sollte zwischen 0,1 mm und 2,0 mm liegen. Hierdurch werden die Fasern des Faserverbands geringeren mechanischen Belastungen ausgesetzt als bei entsprechend scharfkantigen Übergängen.It can also bring advantages if the transition area between the end face and the discharge channel and/or the transition between the end face and an outer surface of the yarn-forming element is not sharp-edged, but rounded. The radius of the rounded portions, which should have a ring shape in a plan view of the end face of the yarn-forming element, should be between 0.1 mm and 2.0 mm. As a result, the fibers of the fiber structure are exposed to lower mechanical loads than in the case of correspondingly sharp-edged transitions.

Ebenso ist es vorteilhaft, wenn das Garnbildungselement im Bereich der Stirnseite eine Fase aufweist, welche ebenfalls die Form eines Kegelstumpfs aufweist. Die Fase sollte hierbei vorzugsweise in die Außenfläche des Garnbildungselements übergehen und durch einen kegelstumpfförmigen Bereich der Stirnseite des Garnbildungselements vom Abzugskanal beabstandet sein. Insbesondere ist es von Vorteil, wenn die Grundfläche des die Fase bildenden Kegelstumpfs zwischen der Deckfläche dieses Kegelstumpfs und dem Auslass des Garnbildungselements angeordnet ist. Die Fase sollte also einen Kegelstumpf bilden, der bezüglich des in Anspruch 1 beschriebenen Kegelstumpfs auf dem Kopf gestellt ist. Insbesondere ist es von Vorteil, wenn die Grundfläche des sich an den Abzugskanal anschließenden Kegelstumpfs der Deckfläche des durch die Fase gebildeten Kegelstumpfs entspricht. Beide Kegelstümpfe gehen also vorteilhafterweise direkt ineinander über.It is also advantageous if the yarn-forming element has a chamfer in the area of the end face, which also has the shape of a truncated cone. The bevel should preferably merge into the outer surface of the yarn-forming element and be spaced apart from the discharge channel by a frustoconical area on the end face of the yarn-forming element. In particular, it is advantageous if the base of the truncated cone forming the bevel is arranged between the top surface of this truncated cone and the outlet of the yarn-forming element. The chamfer should thus form a truncated cone which is inverted with respect to the truncated cone described in claim 1. In particular, it is advantageous if the base of the truncated cone adjoining the discharge channel corresponds to the top surface of the truncated cone formed by the chamfer. The two truncated cones therefore advantageously merge directly into one another.

Vorteilhaft ist es, wenn die Fase mit einer Längsachse des Abzugskanals einen Winkel β einschließt, dessen Betrag zwischen 20° und 70°, vorzugsweise zwischen 30° und 60°, liegt. Ferner sollte die Fase in einem Längsschnitt des Garnbildungselements mit dem weiteren, in Anspruch 1 genannten, kegelstumpfförmigen Bereich einen Winkel einschließen, der zwischen 70° und 90 liegt. Ist die Fase zwischen dem Abzugskanal und dem weiteren, einen Kegelstumpf bildenden, Bereich der Stirnseite des Garnbildungselements angeordnet, so sollte der genannte Winkel größer als 140° und kleiner als 180° sein.It is advantageous if the bevel encloses an angle β with a longitudinal axis of the discharge channel, the amount of which is between 20° and 70°, preferably between 30° and 60°. Furthermore, in a longitudinal section of the yarn-forming element, the bevel should enclose an angle of between 70° and 90° with the further frustoconical region mentioned in claim 1. If the chamfer is arranged between the discharge channel and the further area of the end face of the yarn-forming element, which forms a truncated cone, the stated angle should be greater than 140° and smaller than 180°.

Besondere Vorteile bringt es mit sich, wenn die Stirnseite neben einem ersten kegelstumpfförmigen Bereich zumindest einen zweiten kegelstumpfförmigen Bereich aufweist, wobei der zweite kegelstumpfförmige Bereich den ersten kegelstumpfförmigen Bereich in einer Draufsicht auf die Stirnseite des Garnbildungselements umgibt. Beispielsweise kann eine derartige Ausführungsform dadurch realisiert werden, dass das zylindrische Ende des Garnbildungselements, das auch die Einlassöffnung umfasst, zunächst mit einem Senkbohrer derart bearbeitet wird, dass der in Anspruch 1 genannte Bereich entsteht, der die Form eines Kegelstumpfs aufweist und dass anschließend der Übergangsbereich zwischen der Stirnseite des Garnbildungselements und der Außenfläche des Garnbildungselements mit einer ringförmigen Fase versehen wird.There are particular advantages if the end face has at least one second frustoconical region in addition to a first frustoconical region, the second frusto-conical region surrounding the first frusto-conical region in a plan view of the end face of the yarn-forming element. For example, such an embodiment can be realized in that the cylindrical end of the yarn-forming element, which also includes the inlet opening, is first machined with a countersink in such a way that the area mentioned in claim 1, which has the shape of a truncated cone, is created and then the transition area is provided with an annular chamfer between the face of the yarn-forming element and the outer surface of the yarn-forming element.

Besonders vorteilhaft ist es, wenn sich der zweite kegelstumpfförmige Bereich direkt an den ersten kegelstumpfförmigen Bereich anschließt, wobei beide kegelstumpfförmigen Bereiche vorzugsweise konzentrisch zueinander verlaufen. Denkbar ist in diesem Zusammenhang, dass die Grundfläche des ersten kegelstumpfförmigen Bereichs die Deckfläche des zweiten kegelstumpfförmigen Bereichs bildet. Ferner ist es von Vorteil, wenn der Durchmesser der Deckfläche des ersten kegelstumpfförmigen Bereichs kleiner ist als die Deckfläche des zweiten kegelstumpfförmigen Bereichs.It is particularly advantageous if the second frustoconical area directly adjoins the first frustoconical area, with both frustoconical areas preferably running concentrically to one another. It is conceivable in this context that the base of the first frustoconical area forms the top surface of the second frustoconical area. Furthermore, it is advantageous if the diameter of the top surface of the first frustoconical area is smaller than the top surface of the second frustoconical area.

Vorteilhaft ist es zudem, wenn der kleinste Winkel zwischen einer Mantellinie des ersten kegelstumpfförmigen Bereichs und einer Längsachse des Abzugskanals einen anderen, vorzugsweise einen kleineren, Betrag (z. B. 50° bis 80°) aufweist, als der kleinste Winkel zwischen einer Mantellinie des zweiten kegelstumpfförmigen Bereichs und der genannten Längsachse des Abzugskanals (der größer als 70° und kleiner als 90° sein sollte).It is also advantageous if the smallest angle between a generatrix of the first frustoconical area and a longitudinal axis of the discharge channel has a different, preferably smaller, amount (e.g. 50° to 80°) than the smallest angle between a generatrix of the second frustoconical region and said longitudinal axis of the flue (which should be greater than 70° and less than 90°).

In jedem Fall zeichnet sich das erfindungsgemäße Garnbildungselement dadurch aus, dass zumindest ein Teil, z. B. ein ringförmiger Bereich einer Stirnseite des Garnbildungselements, vorzugsweise dessen gesamte Stirnseite, in einem Längsschnitt des Garnbildungselements nach innen in Richtung des Abzugskanals geneigt ist.In any case, the yarn-forming element according to the invention is characterized in that at least a part, e.g. B. an annular region of an end face of the yarn-forming element, preferably the entire end face thereof, is inclined inwardly in the direction of the discharge channel in a longitudinal section of the yarn-forming element.

Schließlich betrifft die vorliegende Erfindung eine Vorspinnmaschine zur Herstellung eines Vorgarns aus einem Faserverband mit wenigstens einer Spinnstelle, wobei die Spinnstelle eine Wirbelkammer mit einer Einlauföffnung für den Faserverband und ein sich zumindest teilweise in die Wirbelkammer erstreckendes Garnbildungselement aufweist. Die Spinnstelle umfasst darüber hinaus in die Wirbelkammer gerichtete Luftdüsen, über die Luft in einer vorgegebenen Drehrichtung in die Wirbelkammer einbringbar ist, um dem über die Einlauföffnung zugeführten Faserverband im Bereich einer Einlassmündung des Garnbildungselements eine Drehung in der genannten Drehrichtung zu erteilen. Hierdurch ist aus dem Faserverband ein Vorgarn mit den bereits beschriebenen Eigenschaften herstellbar. Um das Vorgarn schließlich auf eine Hülse aufwinden zu können, besitzt das Garnbildungselement einen Auslass für den Austritt des Vorgarns und einen die Einlassöffnung und den Auslass verbindenden Abzugskanal, den das Vorgarn vor dem Austritt über den Auslass passiert.Finally, the present invention relates to a roving machine for producing a roving from a fiber structure with at least one spinning station, the spinning station having a turbulence chamber with an inlet opening for the fiber structure and a yarn forming element extending at least partially into the vortex chamber. The spinning station also includes air nozzles directed into the whirl chamber, via which air can be introduced into the whirl chamber in a predetermined direction of rotation, in order to impart a rotation in said direction of rotation to the fiber structure fed via the inlet opening in the region of an inlet opening of the yarn-forming element. As a result, a roving with the properties already described can be produced from the fiber structure. In order to finally be able to wind the roving onto a sleeve, the yarn-forming element has an outlet for the outlet of the roving and a discharge channel connecting the inlet opening and the outlet, through which the roving passes before exiting via the outlet.

Erfindungsgemäß ist nun vorgesehen, dass das Garnbildungselement gemäß bisheriger bzw. nachfolgender Beschreibung ausgebildet ist, wobei die einzelnen Merkmale in beliebiger Kombination verwirklicht sein können, sofern sich hieraus keine Widersprüche ergeben.According to the invention, it is now provided that the yarn-forming element is designed according to the previous or following description, with the individual features being able to be implemented in any combination, provided that this does not result in any contradictions.

Weitere Vorteile der Erfindung sind in den nachfolgenden Ausführungsbeispielen beschrieben. Es zeigen, jeweils schematisch:

Figur 1
eine Vorspinnmaschine in der Seitenansicht,
Figur 2
einen Ausschnitt einer bekannten Spinndüse einer Vorspinnmaschine,
Figur 3a
einen Kegelstumpf,
Figur 3b
einen Ausschnitt eines erfindungsgemäßen Garnbildungselements im Längsschnitt,
Figuren 4a bis 7b
einen Ausschnitt weiterer Ausführungsformen erfindungsgemäßer Garnbildungselemente im Längsschnitt, und
Figur 8
einen Ausschnitt einer weiteren Spinndüse einer Vorspinnmaschine.
Further advantages of the invention are described in the following exemplary embodiments. They show, each schematically:
figure 1
a roving machine in side view,
figure 2
a section of a known spinneret of a roving machine,
Figure 3a
a truncated cone,
Figure 3b
a section of a yarn formation element according to the invention in longitudinal section,
Figures 4a to 7b
a detail of further embodiments of yarn formation elements according to the invention in longitudinal section, and
figure 8
a section of another spinneret of a roving frame.

Figur 1 zeigt eine schematische Ansicht eines Ausschnitts einer Vorspinnmaschine. Die Vorspinnmaschine kann bei Bedarf ein Streckwerk mit mehreren, jeweils um eine Drehachse 23 drehbare, Streckwerkswalzen 21 umfassen (nur zwei der sechs Streckwerkswalzen 21 sind mit einem Bezugszeichen versehen), wobei das Streckwerk während des Spinnbetriebs mit einem Faserverband 1, beispielsweise in Form eines doublierten Streckenbands, beliefert wird. figure 1 shows a schematic view of a section of a roving machine. If required, the roving machine can have a drafting system with several, each around a rotary axis 23 rotatable drafting system rollers 21 (only two of the six drafting system rollers 21 are provided with a reference number), the drafting system being supplied with a fiber structure 1, for example in the form of a doubled draw frame sliver, during the spinning operation.

Ferner umfasst die gezeigte Vorspinnmaschine eine oder mehrere benachbart zueinander angeordneten Spinndüsen 22 mit jeweils einer innenliegenden Wirbelkammer 15 (siehe Figur 2), in welcher der Faserverband 1 bzw. mindestens ein Teil der Fasern des Faserverbands 1 mit einer Drehung versehen wird (die genaue Wirkungsweise der Spinndüse 22 wird im Folgenden noch näher beschrieben).Furthermore, the roving frame shown comprises one or more spinning nozzles 22 arranged adjacent to one another, each with an internal turbulence chamber 15 (see FIG figure 2 ), in which the fiber structure 1 or at least some of the fibers of the fiber structure 1 is provided with a twist (the precise mode of operation of the spinneret 22 is described in more detail below).

Darüber hinaus kann die Vorspinnmaschine eine Abzugseinrichtung 24 mit mehreren zusammenwirkenden Abzugswalzen 31 sowie eine den Abzugswalzen 31 nachgeschaltete Spulvorrichtung 25 umfassen, mit deren Hilfe das die Spinndüse 22 über einen Auslass 4 (der gleichzeitig den Auslass 4 des beispielsweise in Figur 2 näher gezeigten Abzugskanals 5 bildet) verlassende Vorgarn 2 auf eine Hülse 32 aufgespult werden kann, um eine Spule zu bilden, wobei hierbei ein Changierelement 20 zum Einsatz kommen kann. Die erfindungsgemäße Vorspinnmaschine muss nicht zwangsweise ein Streckwerk aufweisen, wie dies in Figur 1 dargestellt ist. Auch sind die Abzugswalzen 31 nicht zwingend notwendig.In addition, the roving machine can comprise a take-off device 24 with a plurality of interacting take-off rollers 31 and a winding device 25 downstream of the take-off rollers 31, with the aid of which the spinneret 22 can be fed via an outlet 4 (which at the same time is the outlet 4 of the, for example, in figure 2 closer shown discharge channel 5 forms) leaving roving 2 can be wound onto a sleeve 32 to form a coil, in which case a traversing element 20 can be used. The roving machine according to the invention does not necessarily have to have a drafting system, as is shown in figure 1 is shown. The take-off rollers 31 are also not absolutely necessary.

In jedem Fall arbeitet die erfindungsgemäße Vorspinnmaschine nach einem Luftspinnverfahren. Zur Bildung des Vorgarns 2 wird der Faserverband 1 über eine Einlauföffnung 16, in der vorzugsweise ein so genanntes Faserführungselement angeordnet ist, in die Wirbelkammer 15 der Spinndüse 22 geführt (siehe auch Figur 2). Dort erhält es eine Drehung, d. h. mindestens ein Teil der freien Faserenden des Faserverbands 1 wird von einer Luftströmung, die durch entsprechend in einer die Wirbelkammer 15 umgebenden Wirbelkammerwandung 26 angeordnete Luftdüsen 18 erzeugt wird, erfasst. Ein Teil der Fasern wird hierbei aus dem Faserverband 1 zumindest ein Stück weit herausgezogen und um die Spitze eines in die Wirbelkammer 15 ragenden Garnbildungselements 17 gewunden. Dadurch, dass der Faserverband 1 durch eine im Bereich der in Richtung der Einlauföffnung 16 weisenden Stirnseite 6 des Garnbildungselements 17 angeordnete Einlassmündung 3 des Garnbildungselements 17 über einen innerhalb des Garnbildungselements 17 angeordneten Abzugskanal 5 aus der Wirbelkammer 15 abgezogen wird, werden schließlich auch die freien Faserenden in Richtung der Einlassmündung 3 gezogen und schlingen sich dabei als sogenannte Umwindefasern um die zentral verlaufenden Kernfasern - resultierend in einem die gewünschte Drehung aufweisenden Vorgarn 2. Der Abzugskanal 5 sollte im Übrigen einen Innendurchmesser D aufweisen, dessen Betrag in dem oben genannten Bereich liegt.In any case, the roving machine according to the invention works according to an air spinning process. To form the roving 2, the fiber strand 1 is guided into the turbulence chamber 15 of the spinneret 22 via an inlet opening 16, in which a so-called fiber guide element is preferably arranged (see also figure 2 ). There it is rotated, ie at least a part of the free fiber ends of the fiber structure 1 is caught by an air flow which is generated by air nozzles 18 correspondingly arranged in a turbulence chamber wall 26 surrounding the turbulence chamber 15 . Some of the fibers are pulled out of the fiber structure 1 at least a little and wound around the tip of a yarn-forming element 17 protruding into the eddy chamber 15 . Due to the fact that the fiber structure 1 is pushed through an end face 6 of the yarn-forming element 17 in the area of the end face 6 pointing in the direction of the inlet opening 16 arranged inlet opening 3 of the yarn-forming element 17 is drawn off from the turbulence chamber 15 via a discharge channel 5 arranged within the yarn-forming element 17, the free fiber ends are finally also pulled in the direction of the inlet opening 3 and thereby wrap around the centrally running core fibers as so-called winding fibers - resulting in a roving 2 having the desired twist. The draw-off channel 5 should also have an inside diameter D, the amount of which is in the above-mentioned range.

Generell sei an dieser Stelle klargestellt, dass es sich bei dem hergestellten Vorgarn 2 um ein Garn mit einem relativ geringen Anteil an Umwindefasern, bzw. um ein Garn, bei dem die Umwindefasern relativ locker um den inneren Kern geschlungen sind, handelt, so dass das Vorgarn 2 verzugsfähig bleibt. Dies ist entscheidend, da das hergestellte Vorgarn 2 an einer nachfolgenden Textilmaschine (beispielsweise einer Ringspinnmaschine) nochmals mit Hilfe eines Streckwerks verzogen werden muss, um zu einem herkömmlichen Garn weiterverarbeitet werden zu können, das beispielsweise auf einer Webmaschine zu einem Stoff verarbeitet werden kann.In general, it should be made clear at this point that the roving 2 produced is a yarn with a relatively small proportion of twisted fibers, or a yarn in which the twisted fibers are wrapped relatively loosely around the inner core, so that the Roving 2 remains draftable. This is crucial because the roving 2 produced has to be drafted again on a subsequent textile machine (e.g. a ring spinning machine) using a drafting system in order to be able to be further processed into a conventional yarn that can be processed into a fabric, for example on a weaving machine.

Im Hinblick auf die Luftdüsen 18 sei an dieser Stelle zudem rein vorsorglich erwähnt, dass diese in der Regel so ausgerichtet sein sollten, dass sie gemeinsam eine gleichgerichtete Luftströmung mit einem einheitlichen Drehsinn erzeugen. Vorzugsweise sind die einzelnen Luftdüsen 18 hierbei rotationssymmetrisch zueinander angeordnet. Zudem sei darauf hingewiesen, dass die Neigung der Luftdüsen 18 bezogen auf die Längsachse L des Abzugskanals 5 in gewissen Grenzen gewählt werden kann. So könnten die Luftdüsen 18 beispielsweise senkrecht zur genannten Längsachse L verlaufen (siehe in Figur 2 links gezeigte Luftdüse 18). Denkbar ist selbstverständlich auch eine gewisse Schrägstellung, so dass der Winkel zwischen einer nicht gezeigten Mittelachse der Luftdüse 18 und der Längsachse L von 90° abweicht (siehe in Figur 2 rechts gezeigte Luftdüse 18). Generell sollte die Neigung aller Luftdüsen 18 gleich sein. Die Darstellung in Figur 2 wurde also nur gewählt, um prinzipiell zu zeigen, dass generell unterschiedliche Neigungen der Luftdüsen 18 denkbar sind.With regard to the air nozzles 18, it should also be mentioned at this point, purely as a precaution, that they should generally be aligned in such a way that they jointly generate a rectified air flow with a uniform direction of rotation. The individual air nozzles 18 are preferably arranged rotationally symmetrically to one another. It should also be pointed out that the inclination of the air nozzles 18 in relation to the longitudinal axis L of the discharge channel 5 can be selected within certain limits. For example, the air nozzles 18 could run perpendicular to the longitudinal axis L mentioned (see in figure 2 air nozzle 18 shown on the left). Of course, a certain inclination is also conceivable, so that the angle between a central axis (not shown) of the air nozzle 18 and the longitudinal axis L deviates from 90° (see in figure 2 air nozzle shown on the right 18). In general, the inclination of all air nozzles 18 should be the same. The representation in figure 2 was therefore only chosen to show in principle that generally different inclinations of the air nozzles 18 are conceivable.

Während Figur 2 ein bereits bekanntes Garnbildungselement 17 mit einer senkrecht zur Längsachse L des Abzugskanals 5 verlaufenden Stirnseite 6 zeigt, sind den Figuren 3b bis 7b Ausführungsbeispiele erfindungsgemäßer Garnbildungselemente 17 zu entnehmen, wobei aus Übersichtsgründen immer nur der Bereich des die Einlassmündung 3 umgebenden Stirnseite 6 sowie ein Stück der sich daran anschließenden Wandung 30 des Garnbildungselements 17 gezeigt ist.While figure 2 an already known Garnbildungselement 17 with a perpendicular to Longitudinal axis L of the discharge channel 5 extending end face 6 shows are the Figures 3b to 7b Exemplary embodiments of yarn-forming elements 17 according to the invention can be seen, whereby for reasons of clarity only the area of the end face 6 surrounding the inlet opening 3 and a piece of the adjoining wall 30 of the yarn-forming element 17 are shown.

Wie nun beispielsweise Figur 3b zeigt, zeichnet sich das erfindungsgemäße Garnbildungselement 17 dadurch aus, dass die genannte Stirnfläche, die Teil der Wandung 30 des Garnbildungselements 17 ist, leicht nach innen geneigt ist. Mit anderen Worten: Das Garnbildungselement 17 umfasst eine die Einlassmündung 3 umgebende Stirnseite 6, die zumindest abschnittsweise die Form eines Kegelstumpfs 27 aufweist, wobei die Deckfläche 7 des Kegelstumpfs 27 zwischen der Grundfläche 8 des Kegelstumpfs 27 und dem Auslass 4 des Garnbildungselements 17 angeordnet ist.Like now, for example Figure 3b shows, the yarn-forming element 17 according to the invention is characterized in that said end face, which is part of the wall 30 of the yarn-forming element 17, is inclined slightly inward. In other words: The yarn-forming element 17 comprises an end face 6 surrounding the inlet opening 3, which has the shape of a truncated cone 27 at least in sections, with the top surface 7 of the truncated cone 27 being arranged between the base 8 of the truncated cone 27 and the outlet 4 of the yarn-forming element 17.

Hinsichtlich der verwendeten Begrifflichkeiten im Zusammenhang mit dem Kegelstumpf 27 wird auf Figur 3a verwiesen, der zu entnehmen ist, dass es sich bei der Deckfläche 7 um die Kreisfläche mit dem kleineren Radius und bei der Grundfläche 8 um die Kreisfläche mit dem größeren Radius handelt. Die Mantelfläche 29 ist schließlich die Fläche, die die Grundfläche 8 mit der Deckfläche 7 verbindet. Die Mantellinien 28 sind die Linien, die auf der Mantelfläche 29 liegen und in einer Ebene mit der Kegelachse K verlaufen, die wiederum die Rotationsachse des Kegelstumpfs 27 darstellt.With regard to the terminology used in connection with the truncated cone 27 is on Figure 3a referred, from which it can be seen that the top surface 7 is the circular surface with the smaller radius and the base surface 8 is the circular surface with the larger radius. Finally, the lateral surface 29 is the surface that connects the base surface 8 to the top surface 7 . The generatrices 28 are the lines that lie on the lateral surface 29 and run in a plane with the cone axis K, which in turn represents the axis of rotation of the truncated cone 27 .

Wie den einzelnen Ausführungsbeispielen gemäß den Figuren 3b bis 7b zu entnehmen ist, weist das erfindungsgemäße Garnbildungselement 17 eine Stirnseite 6 auf, die zumindest abschnittsweise die oben genannte Kegelstumpfform aufweist, wobei der aus Übersichtsgründen ausschließlich in Figur 3b gezeigte Winkel α zwischen der Längsachse L des Abzugskanals 5 und einer beliebigen Mantellinie 28 des Kegelstumpfs 27 einen Betrag aufweist, der größer als 70° und kleiner als 90° ist. Der genannte Bereich bildet damit einen relativ flachen Konus, der damit auch nur eine geringe Trichterwirkung besitzt.As the individual embodiments according to the Figures 3b to 7b as can be seen, the yarn-forming element 17 according to the invention has an end face 6 which, at least in sections, has the above-mentioned truncated cone shape, with the Figure 3b Angle α shown between the longitudinal axis L of the discharge channel 5 and any surface line 28 of the truncated cone 27 has an amount that is greater than 70 ° and less than 90 °. Said area thus forms a relatively flat cone, which also has only a slight funnel effect.

Vorzugsweise bildet der kegelstumpfförmige Bereich die gesamte Stirnseite 6 des Garnbildungselements 17, die die Einlassmündung 3 umgibt und die die den Abzugskanal 5 begrenzende Innenfläche 19 des Garnbildungselements 17 und eine Außenfläche 10 desselben verbindet, die vorzugsweise konzentrisch zur genannten Innenfläche 19 verläuft (zumindest in einem ersten sich an die Stirnseite 6 anschließenden Bereich). Eine entsprechende Ausführung ist in Figur 3b gezeigt.The frustoconical area preferably forms the entire end face 6 of the Yarn-forming element 17, which surrounds the inlet opening 3 and which connects the inner surface 19 of the yarn-forming element 17, which delimits the discharge channel 5, and an outer surface 10 of the same, which preferably runs concentrically with said inner surface 19 (at least in a first area adjoining the end face 6). A corresponding version is in Figure 3b shown.

Ferner ist es denkbar, dass der Übergang 11 zwischen der Stirnseite 6 des Garnbildungselements 17 und der genannten Außenfläche 10 desselben abgerundet ist (Figuren 4a und 4b). Alternativ oder zusätzlich kann auch der Übergangsbereich 9 zwischen der Stirnseite 6 des Garnbildungselements 17 und dem Abzugskanal 5 abgerundet sein (Figur 4b).It is also conceivable that the transition 11 between the end face 6 of the yarn-forming element 17 and the aforementioned outer surface 10 of the same is rounded ( Figures 4a and 4b ). Alternatively or additionally, the transition area 9 between the end face 6 of the yarn-forming element 17 and the discharge channel 5 can also be rounded ( Figure 4b ).

Die Figuren 5a und 5b zeigen Lösungen, bei denen die Stirnseite 6 des Garnbildungselements 17 neben dem genannten Bereich mit der Form eines Kegelstumpfs 27 einen weiteren Bereich umfasst, der ebenfalls die Form eines Kegelstumpfs 27 aufweist. Die Stirnseite 6 umfasst also vorzugsweise einen ersten kegelstumpfförmigen Bereich 13 und einen zweiten kegelstumpfförmigen Bereich 14.The Figures 5a and 5b show solutions in which the end face 6 of the yarn-forming element 17 comprises, in addition to the area mentioned having the shape of a truncated cone 27 , a further area which also has the shape of a truncated cone 27 . The end face 6 therefore preferably comprises a first frustoconical area 13 and a second frustoconical area 14.

Vorzugsweise ist der Winkel ε zwischen einer Mantellinie 28 des ersten kegelstumpfförmigen Bereichs 13 und der Längsachse L des Abzugskanals 5 größer als der Winkel δ zwischen einer Mantellinie 28 des zweiten kegelstumpfförmigen Bereichs 14 und der Längsachse L des Abzugskanals 5 (Figur 5b). Für manche Fälle kann jedoch auch eine gegenteilige Ausführung von Vorteil sein, wie sie in Figur 5a gezeigt ist.Preferably, the angle ε between a surface line 28 of the first frustoconical area 13 and the longitudinal axis L of the discharge channel 5 is greater than the angle δ between a surface line 28 of the second frustoconical area 14 and the longitudinal axis L of the discharge channel 5 ( Figure 5b ). In some cases, however, the opposite design can also be advantageous, as shown in Figure 5a is shown.

Die Figuren 6a und 6b zeigen, dass die Stirnseite 6 des Garnbildungselements 17 teilweise auch durch eine Fase 12 gebildet sein kann, wobei der Winkel β zwischen einer Mantellinie 28 des Kegelstumpfs 27, der durch die Fase 12 beschrieben wird, und der Längsachse L des Abzugskanals 5 vorzugsweise in dem bereits in der allgemeinen Beschreibung genannten Bereich liegt. Die Fase 12 bildet prinzipiell den oben beschriebenen zweiten kegelstumpfförmigen Bereich 14.The Figures 6a and 6b show that the end face 6 of the yarn-forming element 17 can also be partially formed by a chamfer 12, the angle β between a surface line 28 of the truncated cone 27, which is described by the chamfer 12, and the longitudinal axis L of the discharge channel 5 preferably in the already in the range mentioned in the general description. In principle, the chamfer 12 forms the second frustoconical region 14 described above.

Des Weiteren ist den Figuren 7a und 7b zu entnehmen, dass die Form der Außenfläche 10 des Garnbildungselements 17 und/oder die Form der Innenfläche 19 des Garnbildungselements 17 von der Form eines Zylinders abweichen und/oder Abstufungen aufweisen kann.Furthermore, the Figures 7a and 7b can be seen that the shape of the outer surface 10 of the yarn-forming element 17 and/or the shape of the inner surface 19 of the yarn-forming element 17 may deviate from the shape of a cylinder and/or have gradations.

Abschließend zeigt Figur 8 ausschnittsweise einen Querschnitt durch eine weitere Spinndüse 22. Neben Luftdüsen 18, die der Bildung der bereits beschriebenen Wirbelluftströmung während des Normalbetriebs und damit nach einem Anspinnvorgang dienen, umfasst die Spinndüse 22 darüber hinaus eine oder mehrere Anspinnluftdüsen 33, über die während eines Anspinnvorgangs (ebenfalls) Druckluft in die Wirbelkammer 15 eingebracht werden kann.Finally shows figure 8 A detail of a cross section through another spinneret 22. In addition to air nozzles 18, which serve to form the already described turbulent air flow during normal operation and thus after a piecing process, the spinneret 22 also includes one or more piecing air nozzles 33, via which (likewise) Compressed air can be introduced into the vortex chamber 15.

Mit anderen Worten ist es also von Vorteil, wenn die Spinndüse 22 spezielle Anspinnluftdüsen 33 aufweist, die ausschließlich oder gemeinsam mit den Luftdüsen 18 während eines Anspinnvorgangs mit Druckluft beschickt werden. Bei dem Anspinnvorgang handelt es sich um die Anfangssequenz der Vorgarnherstellung, bei der der Faserverband 1 in die bis dahin leere Wirbelkammer 15 eingeführt und dort zu einem Vorgarn 2 verdreht wird. Der hierdurch gebildete Vorgarnabschnitt wird bei weiterhin andauernder Zufuhr und Verdrehung des Faserverbands 1 über eine entsprechende Abzugseinrichtung 24 nach Verlassen des Abzugskanals 5 übernommen und mit einer sich drehenden Hülse 32 in Kontakt gebracht. Im Anschluss daran erfolgt der Normalbetrieb der Spinndüse 22, bei der kontinuierlich weiteres Vorgarn 2 aus dem zugeführten Faserverband 1 hergestellt und aus der Spinndüse 22 abgezogen wird.In other words, it is advantageous if the spinning nozzle 22 has special piecing air nozzles 33 which are fed with compressed air exclusively or together with the air nozzles 18 during a piecing process. The piecing process is the initial sequence of roving production, in which the fiber structure 1 is introduced into the previously empty eddy chamber 15 and twisted there to form a roving 2 . The roving section thus formed is taken over by a corresponding take-off device 24 after leaving the take-off channel 5 and is brought into contact with a rotating sleeve 32 while the supply and twisting of the fiber structure 1 continues. This is followed by normal operation of the spinneret 22 , in which further roving 2 is continuously produced from the supplied fiber structure 1 and drawn off from the spinneret 22 .

Während es von Vorteil sein kann, während des Normalbetriebs nur die Luftdüsen 18 und während des Anspinnvorgangs ausschließlich die Anspinnluftdüsen 33 mit Druckluft zu beaufschlagen (beide sollten mit der Längsachse L des Abzugskanals 5 unterschiedliche Winkel einschließen), kann es ebenso Vorteile mit sich bringen, wenn die Anspinnluftdüsen 33 auch während des Normalbetriebs mit Druckluft beaufschlagt werden. Insbesondere sollten die Anspinnluftdüsen 33 hierbei gegenüber der Längsachse L des Abzugskanals 5 geneigt sein, um eine Luftströmung generieren zu können, die sich zumindest ein Stück weit in den Abzugskanal 5 erstreckt (der Winkel zwischen der Längsachse L und einer Mittelachse der Anspinnluftdüsen 33 bzw. deren Richtungsvektoren sollte also von 90° abweichen). Hierdurch wird schließlich verhindert, dass Luft entgegen der Bewegungsrichtung des Vorgarns 2 durch den Abzugskanal 5 in Richtung dessen Einlassmündung 3 strömt.While it can be advantageous to apply compressed air only to the air nozzles 18 during normal operation and only to the piecing air nozzles 33 during the piecing process (both should enclose different angles with the longitudinal axis L of the draw-off channel 5), it can also be advantageous if the piecing air nozzles 33 are also subjected to compressed air during normal operation. In particular, the piecing air nozzles 33 should be inclined relative to the longitudinal axis L of the offtake duct 5 in order to be able to generate an air flow that extends at least a little way into the offtake duct 5 (the angle between the longitudinal axis L and a central axis of the piecing air nozzles 33 or their direction vectors should therefore deviate from 90°). This ultimately prevents air from flowing through the discharge channel 5 in the direction of its inlet opening 3 counter to the direction of movement of the roving 2 .

Die vorliegende Erfindung ist nicht auf die dargestellten und beschriebenen Ausführungsbeispiele beschränkt. Abwandlungen im Rahmen der Patentansprüche sind möglich.The present invention is not limited to the illustrated and described embodiments. Modifications within the scope of the patent claims are possible.

BezugszeichenlisteReference List

11
Faserverbandfiber bandage
22
Vorgarnroving
33
Einlassmündung des GarnbildungselementsYarn forming element inlet mouth
44
Auslass des GarnbildungselementsYarn forming element outlet
55
Abzugskanalculvert
66
Stirnseite des GarnbildungselementsFront side of the yarn formation element
77
Deckfläche des KegelstumpfsTop surface of the truncated cone
88th
Grundfläche des Kegelstumpfsbase of the truncated cone
99
Übergangsbereich zwischen der Stirnseite des Garnbildungselements und dem AbzugskanalTransition area between the end face of the yarn formation element and the discharge channel
1010
Außenfläche des GarnbildungselementsOuter surface of the yarn forming element
1111
Übergang zwischen der Stirnseite des Garnbildungselements und der Außenfläche desselbenTransition between the face of the yarn-forming element and the outer surface of the same
1212
Fasechamfer
1313
erster kegelstumpfförmiger Bereichfirst frustoconical area
1414
zweiter kegelstumpfförmiger Bereichsecond frustoconical area
1515
Wirbelkammervortex chamber
1616
Einlauföffnunginlet opening
1717
Garnbildungselementyarn forming element
1818
Luftdüseair nozzle
1919
den Abzugskanal begrenzende Innenfläche des Garnbildungselementsinner surface of the yarn-forming element delimiting the drainage channel
2020
Changierelementoscillating element
2121
Streckwerkswalzedrafting roller
2222
Spinndüsespinneret
2323
Drehachse der StreckwerkswalzeAxis of rotation of the drafting system roller
2424
Abzugseinrichtungtrigger device
2525
Spulvorrichtungspooling device
2626
Wirbelkammerwandungvortex chamber wall
2727
Kegelstumpftruncated cone
2828
Mantellinie des Kegelstumpfssurface line of the truncated cone
2929
Mantelfläche des Kegelstumpfslateral surface of the truncated cone
3030
Wandung des GarnbildungselementsWall of the yarn forming element
3131
Abzugswalzepull-off roller
3232
Hülsesleeve
3333
Anspinnluftdüsepiecing air nozzle
αa
Winkel zwischen einer Mantellinie des Kegelstumpfs und dessen KegelachseAngle between a surface line of the truncated cone and its cone axis
ββ
Winkel zwischen der Fase und einer Längsachse des AbzugskanalsAngle between the chamfer and a longitudinal axis of the flue
δδ
Winkel zwischen einer Mantellinie des zweiten kegelstumpfförmigen Bereichs und der Längsachse des AbzugskanalsAngle between a generatrix of the second frustoconical portion and the longitudinal axis of the flue
εε
Winkel zwischen einer Mantellinie des ersten kegelstumpfförmigen Bereichs und einer Längsachse des AbzugskanalsAngle between a generatrix of the first frustoconical portion and a longitudinal axis of the flue
DD
Innendurchmesser des AbzugskanalsInside diameter of the flue
LL
Längsachse des AbzugskanalsLongitudinal axis of the culvert
KK
Kegelachsecone axis

Claims (10)

  1. A yarn-forming element (17) for a roving machine, with which a roving (2) can be produced from a fiber structure (1) with the help of compressed air,
    - wherein the yarn-forming element (17) comprises an intake opening (3) for fibers of the fiber structure (1), and
    - wherein the yarn-forming element (17) has an outlet (4) for the emergence of the roving (2) produced from the fiber structure (1) in the area of the intake opening (3) of the yarn-forming element (17) during operation of the roving machine and having a draw-off channel (5), which connects the intake opening (3) and the outlet (4),
    characterized in that
    the yarn-forming element (17) comprises a front end (6), which surrounds the intake opening (3) and has a truncated cone shape (27) in at least some sections,
    - wherein the cover surface (7) of the truncated cone (27) is arranged between the base surface (8) of the truncated cone (27) and the outlet (4) of the yarn-forming element (17), and
    - wherein the angle (α) between a lateral line (28) of the truncated cone (27) and its cone axis (K) has a value less than 90° and greater than 70°.
  2. The yarn-forming element (17) according to the preceding claims, characterized in that the draw-off channel (5) has a longitudinal axis (L), and the longitudinal axis (L) and the aforementioned cone axis (K) run parallel or colinear to one another.
  3. The yarn-forming element (17) according to any one of the preceding claims, characterized in that the draw-off channel (5) has an inside diameter (D) in an area adjacent to the intake opening (3), the amount being 4 mm to 12 mm, preferably 6 mm to 8 mm.
  4. The yarn-forming element (17) according to any one of the preceding claims, characterized in that the yarn-forming element (17) has a cylindrical wall (30) with a cylindrical outside surface (10) and a cylindrical inside surface (19) bordering the draw-off channel (5) in the area of the intake opening (3), wherein the inside surface (19) and the outside surface (10) run concentrically, and wherein the entire front end (6) of the yarn-forming element (17) connecting the outside surface (10) and the inside surface (19) has a truncated cone shape (27).
  5. The yarn-forming element (17) according to any one of the preceding claims, characterized in that the transition region (9) between the front end (6) and the draw-off channel (5) and/or the transition (11) between the front end (6) and an outside surface (10) of the yarn-forming element (17) is/are rounded.
  6. The yarn-forming element (17) according to any one of the preceding claims, characterized in that the yarn-forming element (17) has in the area of the front end (6) a chamfer (12), which is also in a truncated cone shape (27), wherein the base surface (8) of the truncated cone (27) forming the chamber (12) is arranged between the cover surface (7) of this truncated cone (27) and the outlet (4) of the yarn-forming element (17).
  7. The yarn-forming element (17) according to any one of the preceding claims, characterized in that the chamfer (12) forms an angle (β) with the longitudinal axis (L) of the draw-off channel (5), this angle amounting to between 20° and 70°, preferably between 30° and 60°.
  8. The yarn-forming element (17) according to any one of the preceding claims, characterized in that the front end (6) has at least one second truncated cone region (14) in addition to a first truncated cone region (13), wherein the second truncated cone region (14) surrounds the first truncated cone region (13) in a top view of the front end (6) of the yarn-forming element (17).
  9. The yarn-forming element (17) according to the preceding claim, characterized in that the second truncated cone region (14) is connected directly to the first truncated cone region (13) wherein both truncated cone regions preferably run concentrically to one another.
  10. A roving machine for producing a roving (2) from a fiber structure (1) having at least one spinneret,
    - wherein the spinneret has an eddy chamber (15) with an intake opening (16) for the fiber structure (1) and a yarn-forming element (17) extending at least partially into the eddy chamber (15), and
    - wherein the spinneret comprises air jets (18) directed into the eddy chamber (15), by means of which air can be introduced into the eddy chamber (15) in a predetermined direction of rotation in order to impart a twist in the aforementioned direction of rotation to the fiber structure (1) fed through the intake opening (16) in the region of an intake opening (3) of the yarn-forming element (17),
    characterized in that
    the yarn-forming element (17) is designed according to any one of the preceding claims.
EP17723523.1A 2016-05-26 2017-05-04 Yarn forming element for a pre-spinning machine and pre-spinning machine equipped therewith Active EP3464691B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH00675/16A CH712489A1 (en) 2016-05-26 2016-05-26 Garnbildungselement for a roving and equipped therewith roving.
PCT/IB2017/052586 WO2017203376A1 (en) 2016-05-26 2017-05-04 Twine forming element for a pre-spinning machine and pre-spinning machine equipped therewith

Publications (2)

Publication Number Publication Date
EP3464691A1 EP3464691A1 (en) 2019-04-10
EP3464691B1 true EP3464691B1 (en) 2023-05-03

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Application Number Title Priority Date Filing Date
EP17723523.1A Active EP3464691B1 (en) 2016-05-26 2017-05-04 Yarn forming element for a pre-spinning machine and pre-spinning machine equipped therewith

Country Status (6)

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US (1) US10900144B2 (en)
EP (1) EP3464691B1 (en)
JP (1) JP6972025B2 (en)
CN (1) CN109154110B (en)
CH (1) CH712489A1 (en)
WO (1) WO2017203376A1 (en)

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CH712663A1 (en) * 2016-07-14 2018-01-15 Rieter Ag Maschf Process for processing a strand-like fiber composite and roving machine.
DE102020108257A1 (en) * 2020-03-25 2021-09-30 Saurer Spinning Solutions Gmbh & Co. Kg Apparatus for separating fibers and spinning equipment comprising such a device

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Also Published As

Publication number Publication date
CN109154110B (en) 2021-06-18
JP2019519690A (en) 2019-07-11
CN109154110A (en) 2019-01-04
CH712489A1 (en) 2017-11-30
JP6972025B2 (en) 2021-11-24
EP3464691A1 (en) 2019-04-10
US10900144B2 (en) 2021-01-26
US20190323151A1 (en) 2019-10-24
WO2017203376A1 (en) 2017-11-30

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