EP1587974B1 - Method for producing a spun thread - Google Patents

Method for producing a spun thread Download PDF

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Publication number
EP1587974B1
EP1587974B1 EP03788962A EP03788962A EP1587974B1 EP 1587974 B1 EP1587974 B1 EP 1587974B1 EP 03788962 A EP03788962 A EP 03788962A EP 03788962 A EP03788962 A EP 03788962A EP 1587974 B1 EP1587974 B1 EP 1587974B1
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EP
European Patent Office
Prior art keywords
fiber
channel
guide surface
inlet opening
delivery
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EP03788962A
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German (de)
French (fr)
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EP1587974A1 (en
Inventor
Gerd Stahlecker
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP1587974A1 publication Critical patent/EP1587974A1/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/38—Channels for feeding fibres to the yarn forming region
    • 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
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/02—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by a fluid, e.g. air vortex

Definitions

  • the invention relates to an apparatus for producing a spun yarn from a staple fiber strand supplied by a pair of delivery rolls to an air jet unit, having a fiber feed channel downstream of the feed roll pair having an inlet opening and an outlet opening, which is provided with a deflection edge, otherwise substantially planar and substantially parallel to the nip line of the delivery roller pair extending fiber guide surface containing ends in one of the outlet opening subsequent vortex chamber in the region of an inlet opening of a yarn withdrawal channel with a twist stop serving fiber delivery edge.
  • a device of this kind is by the WO 02/24993 A2 State of the art.
  • a staple fiber strand coming from a drafting unit or other drafting unit is passed through a fiber conveying passage to the entrance of a yarn withdrawal passage, first guiding the leading ends of the fibers held in the staple fiber bond into the yarn withdrawal passage while rear free fiber ends are spread apart and caught by the turbulent flow and around which are already located in the inlet opening of the thread withdrawal channel, integrated front ends are turned around, whereby a thread is generated with substantially true rotation.
  • front and “rear” ends of the fibers in this context refers to the transport direction of the staple fiber strand.
  • the invention is based on the object, in a device of the type mentioned largely to avoid the variations in mass and thereby increase the spinning speed with sufficient thread quality.
  • the object is achieved in that the fiber guide surface is increasingly narrower by lateral boundary walls of the fiber conveying channel and at the latest at the deflection has its smallest width.
  • the fiber delivery channel narrows relatively quickly, so that even at the deflection of the fiber guide surface, the smallest width is reached. This width is substantially maintained up to the fiber delivery edge and causes the fibers to be spun pass largely loss-free through the inlet opening in the thread withdrawal channel. This not only leads to an increase in the thread quality, but also allows much higher delivery speeds and spinning speeds.
  • the device according to the invention can be further developed in that the fiber guide surface has at least approximately its smallest width already at an inlet edge upstream of the deflection edge. This smallest width of the fiber guide surface should not exceed three times the diameter of the inlet opening of the thread withdrawal channel, preferably even at most twice this diameter.
  • the device after FIGS. 1 to 3 and 5 includes a delivery device 1 for supplying a staple fiber staple assembly 2 and an air jet unit 3, in which the staple fiber strand 2, the required for spinning a thread 4 rotation is granted.
  • the delivery device 1 contains a pair of delivery rollers 5, 6, which is arranged upstream of the air-jet unit 3 at a small distance and in which it may be the output rollers of an otherwise not shown drafting system.
  • a drafting system warps in a known manner a fed sliver or a roving to a staple fiber strand 2 of the desired fineness.
  • the delivery device 1 may alternatively be a pair of pinch rollers of another drafting device or of another upstream aggregate.
  • Denoted at 7 is a nip line at which the staple fiber strand 2 supplied in the delivery direction A is kept clamped before entering the air jet unit 3.
  • the air jet unit 3 generates for the yarn to be spun 4 its rotation and delivers the yarn 4 in the yarn withdrawal direction B by means of a pair of draw-off rollers, not shown.
  • the air jet unit 3 contains inter alia a nozzle body 8 with a fiber conveying channel 9 and a swirl chamber 10.
  • a fluid device generates in the swirl chamber 10 by blowing compressed air through tangentially into the swirl chamber 10 opening compressed air channels 11 a vortex flow.
  • the emerging from the mouths of the compressed air channels 11 compressed air is discharged through an exhaust duct 12, wherein this has an annular cross-section about a spindle-shaped stationary member 13 around, which in turn encloses a yarn withdrawal channel 14.
  • a fiber discharge edge 16 of a fiber guiding surface 17 is arranged as a swirl barrier, which is arranged eccentrically to the yarn withdrawal channel 14 in the region of its inlet opening 18.
  • the fibers to be spun are held, on the one hand, in the staple fiber structure 2 and thus guided by the outlet opening 15 of the fiber conveying channel 9 substantially without rotation into the yarn withdrawal channel 14.
  • the fibers are exposed to the effect of the turbulent flow, by which they or at least their end regions are driven radially away from the inlet opening 18 of the thread withdrawal channel 14.
  • the filaments 4 produced by the described method therefore exhibit a core of substantially longitudinally extending filaments or fiber regions without substantial rotation and an outer region in which the filaments or fiber regions are rotated about the core.
  • this thread construction comes about by the fact that leading ends of fibers, in particular those whose trailing regions are still held upstream in the fiber conveying channel 9, essentially pass directly into the yarn withdrawal channel 14, but that trailing fiber regions, in particular if they are in the entrance area the Faserzu semiconductorkanals 9 are no longer held, pulled by the vortex formation from the staple fiber strand 2 and then rotated about the resulting thread 4.
  • fibers are involved at the same time both in the resulting thread 4, whereby they are pulled through the thread withdrawal channel 14, as well as the turbulent flow exposed, centrifugally, so from the inlet opening 18 of the thread withdrawal channel 14 away, accelerated and withdrawn into the exhaust duct 12 ,
  • the fiber areas drawn from the staple fiber strand 2 by the swirling flow form a fiber vortex opening into the inlet opening 18 of the thread withdrawal channel 14, the longer portions of which spiral around the spindle-shaped component 13 and are pulled in this spiral against the force of the flow in the exhaust channel 12 against the inlet opening 18 of the thread withdrawal channel 14.
  • FIGS. 1 to 3 and 5 illustrated embodiment there are per air nozzle unit 3 a total of four compressed air channels 11, which are each incorporated into the nozzle body 8.
  • a nozzle body 8 radially surrounding annular space 19 is connected in a manner not shown to a compressed air source.
  • the compressed air then passes from the annular space 19 to the individual compressed air channels 11.
  • the annular space 19 is sealed by a wall 21 of a housing.
  • the fiber conveying channel 9 includes an inlet opening 22, which according to FIG. 5 parallel to the nip line 7 of the delivery roller pair 5.6 has a greater width than transversely thereto. This initially takes into account the fact that the staple fiber strand 2 entering the air jet unit 3 has its greater width along the nip line 7. In the fiber conveying channel 9, the staple fiber strand 2 is guided along a fiber guiding surface 17, which has a deflection edge 23 on its way.
  • the fiber guiding surface 17 can already have at least approximately its smallest width at an inlet edge 26 upstream of the deflecting edge 23.
  • This smallest width should expediently be such that it corresponds to only two times to three times the diameter of the inlet opening 18 of the yarn withdrawal channel 14.

Description

Die Erfindung betrifft eine Vorrichtung zum Herstellen eines gesponnenen Fadens aus einem von einem Lieferwalzenpaar an ein Luftdüsenaggregat gelieferten Stapelfaserverband, mit einem dem Lieferwalzenpaar nachgeordneten, eine Einlassöffnung und eine Auslassöffnung aufweisenden Faserförderkanal, der eine mit einer Umlenkkante versehene, ansonsten im Wesentlichen ebene und im Wesentlichen parallel zur Klemmlinie des Lieferwalzenpaares verlaufende Faserführungsfläche enthält, die in einer der Auslassöffnung nachfolgenden Wirbelkammer im Bereich einer Eintrittsöffnung eines Fadenabzugskanals mit einer einem Drallstopp dienenden Faserabgabekante endet.The invention relates to an apparatus for producing a spun yarn from a staple fiber strand supplied by a pair of delivery rolls to an air jet unit, having a fiber feed channel downstream of the feed roll pair having an inlet opening and an outlet opening, which is provided with a deflection edge, otherwise substantially planar and substantially parallel to the nip line of the delivery roller pair extending fiber guide surface containing ends in one of the outlet opening subsequent vortex chamber in the region of an inlet opening of a yarn withdrawal channel with a twist stop serving fiber delivery edge.

Eine Vorrichtung dieser Art ist durch die WO 02/24993 A2 Stand der Technik. Bei dieser Vorrichtung wird ein von einem Streckwerk oder einem anderen Verzugsaggregat kommender Stapelfaserverband durch einen Faserförderkanal hindurch zur Eintrittsöffnung eines Fadenabzugskanals geführt, wobei zunächst die vorderen Enden der im Stapelfaserverband gehaltenen Fasern in den Fadenabzugskanal geführt werden, während hintere freie Faserenden abgespreizt und von der Wirbelströmung erfasst und um die sich bereits in der Eintrittsöffnung des Fadenabzugskanals befindlichen, eingebundenen vorderen Enden herumgedreht werden, wodurch ein Faden mit weitgehend echter Drehung erzeugt wird. Der Begriff "vordere" und "hintere" Enden der Fasern bezieht sich in diesem Zusammenhang auf die Transportrichtung des Stapelfaserverbandes.A device of this kind is by the WO 02/24993 A2 State of the art. In this apparatus, a staple fiber strand coming from a drafting unit or other drafting unit is passed through a fiber conveying passage to the entrance of a yarn withdrawal passage, first guiding the leading ends of the fibers held in the staple fiber bond into the yarn withdrawal passage while rear free fiber ends are spread apart and caught by the turbulent flow and around which are already located in the inlet opening of the thread withdrawal channel, integrated front ends are turned around, whereby a thread is generated with substantially true rotation. The term "front" and "rear" ends of the fibers in this context refers to the transport direction of the staple fiber strand.

Je höher die Verzüge und die Spinngeschwindigkeiten sind, desto breiter wird der Stapelfaserver-band, der von dem Lieferwalzenpaar an das Luftdüsenaggregat gefördert wird. Mit zunehmender Breite des Stapelfaserverbandes wiederum wird es schwieriger, die zu verspinnenden Fasern ohne Masseschwankungen in das Luftdüsenaggregat einzuführen. Bei der bekannten Vorrichtung, bei welcher der Faserförderkanal einen weitgehend gleichbleibenden Querschnitt aufweist, hat es sich gezeigt, dass die Fasern teilweise an dem Fadenabzugskanal vorbeilaufen und dann auf Grund des im Luftdüsenaggregat herrschenden Unterdruckes im Nachhinein wieder eingesaugt werden. Dadurch entsteht kurzzeitig eine Anhäufung von Fasern, die zu einer nicht erwünschten Anhäufung von Dickstellen führt.The higher the warpage and spinning speeds, the wider the staple fiber band conveyed by the delivery roller pair to the air jet assembly. With increasing width of the staple fiber bandage again, it becomes more difficult to introduce the fibers to be spun into the air jet unit without variations in mass. In the known device, in which the fiber conveying channel has a substantially constant cross-section, it has been shown that the fibers partially pass by the thread withdrawal channel and are then sucked in again due to the pressure prevailing in the air nozzle unit vacuum. This results in a short time an accumulation of fibers, which leads to an undesirable accumulation of thick places.

Bei einer nicht gattungsgemäßen Vorrichtung nach der EP 0 854 214 B1 ist es bekannt, den Faserförderkanal, ausgehend von seiner Einlassöffnung, trichterförmig zu verengen. Diese bekannte Vorrichtung weist jedoch keine als Drallsperre dienende Faserabgabekante auf, sondern die Drallsperre wird auf der gesamten Länge des Faserförderkanals durch eine wendelförmige Faserführungsfläche gebildet.In a non-generic device according to the EP 0 854 214 B1 It is known to constrict the fiber conveying channel, starting from its inlet opening, funnel-shaped. However, this known device has no serving as a swirl barrier fiber delivery edge, but the swirl barrier is formed over the entire length of the fiber conveying channel by a helical fiber guide surface.

Der Erfindung liegt die Aufgabe zu Grunde, bei einer Vorrichtung der eingangs genannten Art die Masseschwankungen weitgehend zu vermeiden und dadurch die Spinngeschwindigkeit bei ausreichender Fadenqualität zu erhöhen.The invention is based on the object, in a device of the type mentioned largely to avoid the variations in mass and thereby increase the spinning speed with sufficient thread quality.

Die Aufgabe wird dadurch gelöst, dass die Faserführungsfläche durch seitliche Begrenzungswände des Faserförderkanals zunehmend schmaler wird und spätestens an der Umlenkkante ihre kleinste Breite aufweist.The object is achieved in that the fiber guide surface is increasingly narrower by lateral boundary walls of the fiber conveying channel and at the latest at the deflection has its smallest width.

Ausgehend von einer in etwa ovalen Einlassöffnung, dessen größere Breite parallel zur Klemmlinie des Lieferwalzenpaares verläuft, verengt sich der Faserförderkanal relativ schnell, so dass bereits an der Umlenkkante der Faserführungsfläche die kleinste Breite erreicht wird. Diese Breite wird bis zur Faserabgabekante im Wesentlichen beibehalten und führt dazu, dass die zu verspinnenden Fasern weitgehend verlustfrei durch die Eintrittsöffnung in den Fadenabzugskanal gelangen. Dies führt nicht nur zu einer Erhöhung der Fadenqualität, sondern erlaubt auch wesentlich höhere Liefergeschwindigkeiten und Spinngeschwindigkeiten.Starting from an approximately oval inlet opening whose larger width is parallel to the nip line of the delivery roller pair, the fiber delivery channel narrows relatively quickly, so that even at the deflection of the fiber guide surface, the smallest width is reached. This width is substantially maintained up to the fiber delivery edge and causes the fibers to be spun pass largely loss-free through the inlet opening in the thread withdrawal channel. This not only leads to an increase in the thread quality, but also allows much higher delivery speeds and spinning speeds.

Die erfindungsgemäße Vorrichtung kann dadurch weiter ausgestaltet werden, dass die Faserführungsfläche bereits an einer der Umlenkkante vorgeordneten Einlasskante wenigstens annähernd ihre kleinste Breite aufweist. Diese kleinste Breite der Faserführungsfläche soll höchstens dem Dreifachen des Durchmessers der Eintrittsöffnung des Fadenabzugskanals entsprechen, vorzugsweise sogar nur höchstens dem Zweifachen dieses Durchmessers.The device according to the invention can be further developed in that the fiber guide surface has at least approximately its smallest width already at an inlet edge upstream of the deflection edge. This smallest width of the fiber guide surface should not exceed three times the diameter of the inlet opening of the thread withdrawal channel, preferably even at most twice this diameter.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung einiger Ausführungsbeispiele.Further advantages and features of the invention will become apparent from the following description of some embodiments.

Es zeigen:

  • Figur 1 in etwa zehnfacher Vergrößerung einen Axialschnitt durch eine erfindungsgemäße Vorrichtung,
  • Figur 2 einen Querschnitt durch einen Düsenkörper des Luftdüsenaggregates längs der Schnittfläche II-II der Figur 1,
  • Figur 3 einen Axialschnitt längs der Schnittfläche III-III der Figur 1,
  • Figur 4 einen Axialschnitt ähnlich Figur 3 bei einer anders ausgestalteten Vorrichtung,
  • Figur 5 eine Ansicht in Richtung des Pfeiles V der Figur 1 auf die Einlassöffnung des Faserförderkanals.
Show it:
  • FIG. 1 at about tenfold magnification an axial section through a device according to the invention,
  • FIG. 2 a cross section through a nozzle body of the air nozzle assembly along the sectional surface II-II of FIG. 1 .
  • FIG. 3 an axial section along the section surface III-III of FIG. 1 .
  • FIG. 4 similar to an axial section FIG. 3 in a differently configured device,
  • FIG. 5 a view in the direction of the arrow V of FIG. 1 on the inlet opening of the fiber conveying channel.

Die Vorrichtung nach Figuren 1 bis 3 und 5 enthält eine Liefereinrichtung 1 zum Zuführen eines zu verspinnenden Stapelfaserverbandes 2 sowie ein Luftdüsenaggregat 3, in welchem dem Stapelfaserverband 2 die zum Erspinnen eines Fadens 4 erforderliche Drehung erteilt wird.The device after FIGS. 1 to 3 and 5 includes a delivery device 1 for supplying a staple fiber staple assembly 2 and an air jet unit 3, in which the staple fiber strand 2, the required for spinning a thread 4 rotation is granted.

Die Liefereinrichtung 1 enthält ein Lieferwalzenpaar 5,6, welches dem Luftdüsenaggregat 3 in geringem Abstand vorgeordnet ist und bei welchem es sich um die Ausgangswalzen eines ansonsten nicht dargestellten Streckwerks handeln kann. Ein solches Streckwerk verzieht in bekannter Weise ein zugeführtes Faserband oder auch ein Vorgarn zu einem Stapelfaserverband 2 der gewünschten Feinheit. Die Liefereinrichtung 1 kann jedoch alternativ ein Klemmwalzenpaar einer anderen Verzugseinrichtung oder eines sonstigen vorgeordneten Aggregates sein. Mit 7 ist eine Klemmlinie bezeichnet, an welcher der in Zulieferrichtung A zugeführte Stapelfaserverband 2 vor dem Einlaufen in das Luftdüsenaggregat 3 geklemmt gehalten wird. Das Luftdüsenaggregat 3 erzeugt für den zu erspinnenden Faden 4 dessen Drehung und liefert den Faden 4 in Fadenabzugsrichtung B mittels eines nicht dargestellten Abzugswalzenpaares ab.The delivery device 1 contains a pair of delivery rollers 5, 6, which is arranged upstream of the air-jet unit 3 at a small distance and in which it may be the output rollers of an otherwise not shown drafting system. Such a drafting system warps in a known manner a fed sliver or a roving to a staple fiber strand 2 of the desired fineness. However, the delivery device 1 may alternatively be a pair of pinch rollers of another drafting device or of another upstream aggregate. Denoted at 7 is a nip line at which the staple fiber strand 2 supplied in the delivery direction A is kept clamped before entering the air jet unit 3. The air jet unit 3 generates for the yarn to be spun 4 its rotation and delivers the yarn 4 in the yarn withdrawal direction B by means of a pair of draw-off rollers, not shown.

Das Luftdüsenaggregat 3 enthält unter anderem einen Düsenkörper 8 mit einem Faserförderkanal 9 und einer Wirbelkammer 10. Eine Fluideinrichtung erzeugt in der Wirbelkammer 10 durch Einblasen von Druckluft durch tangential in die Wirbelkammer 10 mündende Druckluftkanäle 11 eine Wirbelströmung. Die aus den Mündungen der Druckluftkanäle 11 austretende Druckluft wird über einen Abluftkanal 12 abgeführt, wobei dieser einen ringförmigen Querschnitt um ein spindelförmiges stationäres Bauteil 13 herum aufweist, das seinerseits einen Fadenabzugskanal 14 umschließt.The air jet unit 3 contains inter alia a nozzle body 8 with a fiber conveying channel 9 and a swirl chamber 10. A fluid device generates in the swirl chamber 10 by blowing compressed air through tangentially into the swirl chamber 10 opening compressed air channels 11 a vortex flow. The emerging from the mouths of the compressed air channels 11 compressed air is discharged through an exhaust duct 12, wherein this has an annular cross-section about a spindle-shaped stationary member 13 around, which in turn encloses a yarn withdrawal channel 14.

Nach einer Auslassöffnung 15 des Faserförderkanals 9 ist als Drallsperre eine Faserabgabekante 16 einer Faserführungsfläche 17 angeordnet, die exzentrisch zum Fadenabzugskanal 14 im Bereich von dessen Eintrittsöffnung 18 angeordnet ist.After an outlet opening 15 of the fiber conveying channel 9, a fiber discharge edge 16 of a fiber guiding surface 17 is arranged as a swirl barrier, which is arranged eccentrically to the yarn withdrawal channel 14 in the region of its inlet opening 18.

Im Luftdüsenaggregat 3 werden die zu verspinnenden Fasern einerseits im Stapelfaserverband 2 gehalten und so von der Auslassöffnung 15 des Faserförderkanals 9 im Wesentlichen ohne Drehungserteilung in den Fadenabzugskanal 14 geführt. Andererseits sind die Fasern aber im Bereich zwischen Faserförderkanal 9 und Fadenabzugskanal 14 der Wirkung der Wirbelströmung ausgesetzt, durch die sie oder mindestens ihre Endbereiche von der Eintrittsöffnung 18 des Fadenabzugskanals 14 radial hinweg getrieben werden. Die mit dem beschriebenen Verfahren hergestellten Fäden 4 zeigen deshalb einen Kern von im Wesentlichen in Fadenlängsrichtung verlaufenden Fasern oder Faserbereichen ohne wesentliche Drehung und einen äußeren Bereich, in welchem die Fasern oder Faserbereiche um den Kern herum gedreht sind.In the air jet unit 3, the fibers to be spun are held, on the one hand, in the staple fiber structure 2 and thus guided by the outlet opening 15 of the fiber conveying channel 9 substantially without rotation into the yarn withdrawal channel 14. On the other hand, in the area between the fiber conveying channel 9 and the thread withdrawal channel 14, the fibers are exposed to the effect of the turbulent flow, by which they or at least their end regions are driven radially away from the inlet opening 18 of the thread withdrawal channel 14. The filaments 4 produced by the described method therefore exhibit a core of substantially longitudinally extending filaments or fiber regions without substantial rotation and an outer region in which the filaments or fiber regions are rotated about the core.

Dieser Fadenaufbau kommt nach einer modellhaften Erklärung dadurch zu Stande, dass vorlaufende Enden von Fasern, insbesondere solche, deren nachlaufende Bereiche noch stromaufwärts im Faserförderkanal 9 gehalten werden, im Wesentlichen direkt in den Fadenabzugskanal 14 gelangen, dass aber nachlaufende Faserbereiche, insbesondere wenn sie im Eingangsbereich des Faserzuführkanals 9 nicht mehr gehalten werden, durch die Wirbelbildung aus dem Stapelfaserverband 2 gezogen und dann um den entstehenden Faden 4 gedreht werden. Jedenfalls sind Fasern zu einem gleichen Zeitpunkt sowohl im entstehenden Faden 4 eingebunden, wodurch sie durch den Fadenabzugskanal 14 gezogen werden, als auch der Wirbelströmung ausgesetzt, die sie zentrifugal, also von der Eintrittsöffnung 18 des Fadenabzugskanals 14 hinweg, beschleunigt und in den Abluftkanal 12 abzieht. Die durch die Wirbelströmung aus dem Stapelfaserverband 2 gezogenen Faserbereiche bilden einen in die Eintrittsöffnung 18 des Fadenabzugskanals 14 mündenden Faserwirbel, dessen längere Anteile sich spiralartig um das spindelförmige Bauteil 13 winden und in dieser Spirale entgegen der Kraft der Strömung im Abluftkanal 12 gegen die Eintrittsöffnung 18 des Fadenabzugskanals 14 gezogen werden.According to a model explanation, this thread construction comes about by the fact that leading ends of fibers, in particular those whose trailing regions are still held upstream in the fiber conveying channel 9, essentially pass directly into the yarn withdrawal channel 14, but that trailing fiber regions, in particular if they are in the entrance area the Faserzuführkanals 9 are no longer held, pulled by the vortex formation from the staple fiber strand 2 and then rotated about the resulting thread 4. In any case, fibers are involved at the same time both in the resulting thread 4, whereby they are pulled through the thread withdrawal channel 14, as well as the turbulent flow exposed, centrifugally, so from the inlet opening 18 of the thread withdrawal channel 14 away, accelerated and withdrawn into the exhaust duct 12 , The fiber areas drawn from the staple fiber strand 2 by the swirling flow form a fiber vortex opening into the inlet opening 18 of the thread withdrawal channel 14, the longer portions of which spiral around the spindle-shaped component 13 and are pulled in this spiral against the force of the flow in the exhaust channel 12 against the inlet opening 18 of the thread withdrawal channel 14.

Gemäß dem in den genannten Figuren 1 bis 3 und 5 dargestellten Ausführungsbeispiel gibt es pro Luftdüsenaggregat 3 insgesamt vier Druckluftkanäle 11, die jeweils in den Düsenkörper 8 eingearbeitet sind. Ein den Düsenkörper 8 radial umgebender Ringraum 19 ist in nicht dargestellter Weise an eine Druckluftquelle angeschlossen. Über in die Außenkontur eingearbeitete Aussparungen 20 des Düsenkörpers 8 gelangt die Druckluft dann von dem Ringraum 19 zu den einzelnen Druckluftkanälen 11. Nach außen hin ist der Ringraum 19 durch eine Wandung eines Gehäuses 21 abgedichtet.According to the mentioned in the FIGS. 1 to 3 and 5 illustrated embodiment, there are per air nozzle unit 3 a total of four compressed air channels 11, which are each incorporated into the nozzle body 8. A nozzle body 8 radially surrounding annular space 19 is connected in a manner not shown to a compressed air source. About machined into the outer contour recesses 20 of the nozzle body 8, the compressed air then passes from the annular space 19 to the individual compressed air channels 11. To the outside, the annular space 19 is sealed by a wall 21 of a housing.

Der Faserförderkanal 9 enthält eine Einlassöffnung 22, die gemäß Figur 5 parallel zur Klemmlinie 7 des Lieferwalzenpaares 5,6 eine größere Breite hat als quer dazu. Damit ist zunächst dem Umstand Rechnung getragen, dass der in das Luftdüsenaggregat 3 einlaufende Stapelfaserverband 2 längs der Klemmlinie 7 seine größere Breite aufweist. Im Faserförderkanal 9 wird der Stapelfaserverband 2 längs einer Faserführungsfläche 17 geführt, die auf ihrem Wege eine Umlenkkante 23 aufweist. Dies führt bereits zur einer gewissen Auflockerung des geförderten Stapelfaserverbandes 2, bevor dieser nach seinem Austritt aus der Auslassöffnung 15 des Faserförderkanals 9 noch ein Stück über die Faserführungsfläche 17 läuft und unmittelbar vor der Eintrittsöffnung 18 des Fadenabzugskanals 14 an einer so genannten Faserabgabekante 16 endet, die als Drallstopp wirkt. Dieser Drallstopp ist wichtig, damit die dem Faden 4 erteilte Drehung nicht bis zur Klemmlinie 7 des Lieferwalzenpaares 5,6 zurückläuft.The fiber conveying channel 9 includes an inlet opening 22, which according to FIG. 5 parallel to the nip line 7 of the delivery roller pair 5.6 has a greater width than transversely thereto. This initially takes into account the fact that the staple fiber strand 2 entering the air jet unit 3 has its greater width along the nip line 7. In the fiber conveying channel 9, the staple fiber strand 2 is guided along a fiber guiding surface 17, which has a deflection edge 23 on its way. This already leads to a certain loosening of the subsidized staple fiber strand 2, before it exits after its exit from the outlet opening 15 of the fiber conveying channel 9 a piece on the fiber guide surface 17 and ends immediately in front of the inlet opening 18 of the yarn withdrawal channel 14 at a so-called fiber discharge edge 16, the acts as a spin stop. This spin stop is important so that the rotation imparted to the thread 4 does not run back to the nip line 7 of the delivery roller pair 5, 6.

Damit der Stapelfaserverband 2 vor Erreichen der Eintrittsöffnung 18 des Fadenabzugskanals 14 bereits ausreichend schmal und auf eine optimale Breite kondensiert ist, sind im Faserförderkanal 9, wie insbesondere aus Figur 3 ersichtlich, seitliche Begrenzungswände 24 und 25 vorgesehen, wodurch die Faserführungsfläche 17 zunehmend schmaler wird und spätestens an der Umlenkkante 23 ihre kleinste Breite bereits aufweist. Durch diese Ausgestaltung lassen sich die dem eingangs erwähnten Stand der Technik anhaftenden nachteiligen Dickstellen weitgehend vermeiden, so dass auch höhere Spinn- und Liefergeschwindigkeiten möglich werden.So that the staple fiber strand 2 is already sufficiently narrow and condensed to an optimum width before reaching the inlet opening 18 of the yarn withdrawal channel 14, are in the fiber conveying channel 9, as in particular from FIG. 3 visible, lateral boundary walls 24 and 25 are provided, whereby the fiber guide surface 17 is increasingly narrow and at the latest at the deflection edge 23 already has its smallest width. By means of this embodiment, the disadvantageous thick points adhering to the prior art mentioned at the beginning can be largely avoided, so that even higher spinning and delivery speeds become possible.

Aus einer Variante gemäß Figur 4 ist ersichtlich, dass alternativ die Faserführungsfläche 17 bereits an einer der Umlenkkante 23 vorgeordneten Einlasskante 26 wenigstens annähernd ihre kleinste Breite aufweisen kann. Diese kleinste Breite sollte zweckmäßiger Weise so sein, dass sie lediglich dem Zweifachen bis Dreifachen des Durchmessers der Eintrittsöffnung 18 des Fadenabzugskanals 14 entspricht.From a variant according to FIG. 4 It can be seen that, alternatively, the fiber guiding surface 17 can already have at least approximately its smallest width at an inlet edge 26 upstream of the deflecting edge 23. This smallest width should expediently be such that it corresponds to only two times to three times the diameter of the inlet opening 18 of the yarn withdrawal channel 14.

Claims (4)

  1. Device for manufacturing a spun thread (4) from a fibre strand (2) supplied by a delivery roller pair (5, 6) to an air jet unit (3) with a fiber conveying channel (9) arranged downstream of the delivery roller pair and having an inlet opening and an outlet opening, said channel comprising a fiber guide surface provided with a deviation edge and being otherwise substantially planar and substantially parallel to the nip line of the delivery roller pair, said fiber guide surface ending in a vortex chamber (10) downstream of the outlet opening in the area of an inlet opening (36) of a thread delivery channel with a fiber delivery edge serving as a twist stop, characterized in that the fiber guide surface (17) becomes increasingly narrower due to lateral limiting walls (24, 25) of the fiber conveying channel (9) and has its lowest width no later than at the deviation edge (23).
  2. Device according to Claim 1, characterized in that the fiber guide surface (17) already has its lowest width at least approximately at an inlet edge (26) upstream of the deviation edge (23).
  3. Device according to Claim 1 or Claim 2, characterized in that the lowest width of the fiber guide surface (17) is at most triple the diameter of the inlet opening (18) of the thread delivery channel (14).
  4. Device according to Claim 3, characterized in that the lowest width of the fiber guide surface (17) is at most double the diameter of the inlet opening (18) of the thread delivery channel (14).
EP03788962A 2003-01-31 2003-10-24 Method for producing a spun thread Expired - Lifetime EP1587974B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10304823 2003-01-31
DE2003104823 DE10304823A1 (en) 2003-01-31 2003-01-31 Device for producing a spun thread
PCT/EP2003/011768 WO2004067820A1 (en) 2003-01-31 2003-10-24 Method for producing a spun thread

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Publication Number Publication Date
EP1587974A1 EP1587974A1 (en) 2005-10-26
EP1587974B1 true EP1587974B1 (en) 2009-03-04

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EP03788962A Expired - Lifetime EP1587974B1 (en) 2003-01-31 2003-10-24 Method for producing a spun thread

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EP (1) EP1587974B1 (en)
JP (1) JP4263177B2 (en)
AU (1) AU2003293622A1 (en)
DE (2) DE10304823A1 (en)
WO (1) WO2004067820A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103924333B (en) * 2014-04-17 2016-02-03 江阴市华方新技术科研有限公司 A kind of yarn guiding device
ITUA20163006A1 (en) * 2016-04-29 2017-10-29 Savio Macch Tessili Spa AIR-JET TYPE SPINNING DEVICE
EP3859061A1 (en) * 2020-01-30 2021-08-04 Saurer Intelligent Technology AG Fibre bundle receiving device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51130334A (en) * 1975-05-06 1976-11-12 Murata Machinery Ltd Apparatus for making spun yarns
US4986066A (en) * 1988-12-19 1991-01-22 Burlington Industries, Inc. Vacuum spinning nozzle assembly
JP2708000B2 (en) * 1995-02-10 1998-02-04 村田機械株式会社 Spinning equipment
EP0990719B1 (en) * 1998-10-02 2003-05-28 W. SCHLAFHORST AG & CO. Spinning device
US6679044B2 (en) * 2000-12-22 2004-01-20 Maschinenfabrik Rieter Ag Pneumatic spinning apparatus

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DE10304823A1 (en) 2004-08-12
DE50311255D1 (en) 2009-04-16
WO2004067820A1 (en) 2004-08-12
JP4263177B2 (en) 2009-05-13
AU2003293622A1 (en) 2004-08-23
JP2006514166A (en) 2006-04-27
EP1587974A1 (en) 2005-10-26

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