EP0445554A2 - Yarn draw-off nozzle for an open-end spinning machine - Google Patents

Yarn draw-off nozzle for an open-end spinning machine Download PDF

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Publication number
EP0445554A2
EP0445554A2 EP91102072A EP91102072A EP0445554A2 EP 0445554 A2 EP0445554 A2 EP 0445554A2 EP 91102072 A EP91102072 A EP 91102072A EP 91102072 A EP91102072 A EP 91102072A EP 0445554 A2 EP0445554 A2 EP 0445554A2
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EP
European Patent Office
Prior art keywords
thread
nozzle
open
end spinning
base body
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Granted
Application number
EP91102072A
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German (de)
French (fr)
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EP0445554A3 (en
EP0445554B1 (en
Inventor
Eberhard Hofmann
Johann Pohn
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Rieter Ingolstadt Spinnereimaschinenbau AG
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Rieter Ingolstadt Spinnereimaschinenbau AG
Schubert und Salzer Maschinenfabrik AG
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Publication of EP0445554A3 publication Critical patent/EP0445554A3/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
    • D01H4/40—Removing running yarn from the yarn forming region, e.g. using tubes

Definitions

  • the invention relates to an open-end spinning device with a thread draw-off nozzle.
  • the thread-guiding parts were therefore made of wear-resistant material in such a way that a ceramic insert was inserted into the thread take-off nozzle, which was otherwise made of hardenable or hardened steel. This made it possible to considerably improve the service life of the nozzles and thus the operability of these thread take-off nozzles.
  • difficulties with spinning, in particular an increased number of thread breaks, could not be eliminated.
  • the invention is based on the knowledge that in the area of the thread draw-off nozzle, in particular due to the wear-resistant design thereof, heat build-up occurs, which has a disadvantageous effect on the entire spinning process and the yarn formation.
  • the object of the invention is therefore to avoid these disadvantages.
  • the problem is solved by the features of claim 1. What is new and innovative is the knowledge that a heat problem arises at the thread draw-off nozzle, which affects the thread and thus the spinning capacity.
  • the heat-dissipating design of the thread draw-off nozzle prevents the thread draw-off nozzle from heating up and it to the above-mentioned disturbances in the spinning process.
  • Attaching thread-guiding surfaces made of wear-resistant materials to the base body is an advantageous, long-lasting and wear-resistant design. It is particularly advantageous if the base body consists of the materials with high thermal conductivity, such as aluminum or zinc. Of course, other materials and alloys with high thermal conductivity are also suitable. These materials are also particularly suitable, economical, and can be manufactured at very low costs.
  • a thread take-off nozzle which is designed, for example, in such a way that, starting from the spinning element, it tapers and an insert made of hard steel is provided in the - essentially cylindrical - tapered part of the thread take-off nozzle pointing away from the spinning chamber, which combines the advantages of wear resistance with the advantages of thermal conductivity.
  • the thread running through the thread take-off nozzle touches the cylindrical one Part of the surface with a known lower contact pressure than the funnel-shaped. It may therefore be sufficient here for the thread draw-off nozzle material to have a lower wear resistance than ceramic.
  • the open-end spinning device shown in FIG. 1 consists of a rotor 5, into which a mushroom-shaped elevation of the rotor cover 3, which carries the thread take-off nozzle 1, projects approximately centrally.
  • the rotor 5 is surrounded by a rotor housing, not shown, which is usually sealed off by a cover - here the rotor cover 3 - and is under negative pressure during the spinning process.
  • the fibers entering the rotor 3 through the fiber feed channel (not shown) are influenced by their kinetic energy and of the forces prevailing in the rotor are conveyed into the rotor groove 52, spun there into a thread 9 and drawn off from the rotor 5 via the surface 21 of the thread take-off nozzle 1 and conveyed through the thread take-off channel 4 to a storage device (not shown).
  • the thread take-off nozzle 1 is fastened with its base body 11 by conventional means, not shown, in that part of the thread take-off channel 4 which faces away from the rotor 5 and which is located in the rotor cover 3. If there is sufficient contact between the base body 11 and the cover 3, the thread take-off nozzle can also be provided with a thread and screwed into the cover 3.
  • the surface 111 of the thread take-off nozzle 1 pointing towards the inside of the thread take-off channel 4 tapers out in the direction of thread pulling out, but can also be designed essentially cylindrical.
  • the surface 111 can optionally be provided with a wear-resistant coating.
  • the funnel-shaped mouthpiece 12 of the thread draw-off nozzle 1 is placed and points in the direction of the rotor 5.
  • B. made of ceramic material and polished on the surface 21 of its mouth.
  • the thread 9 is withdrawn from the rotor 5 and partially guided over the surfaces 21 and 111, the resulting friction between the thread 9 and the surfaces touched by the thread 9 results in a very high heating of the surfaces, which would worsen the spinning process in a short time, if the temperature would not be kept below favorable values for spinning conditions due to the heat dissipation possible due to the high thermal conductivity of the base body 11.
  • the base body 11 of the thread draw-off nozzle 1 which is produced by casting or die casting or by machining, consists of a material, which has a high thermal conductivity lambda, values of lambda> 80 W / mk being preferred.
  • a material which has a high thermal conductivity lambda, values of lambda> 80 W / mk being preferred.
  • lower values of lambda depending on the rotor speed and the respective properties of the material to be spun, may also be sufficient for the necessary heat dissipation. All materials and elements, as well as their alloys, which have a high lambda value, are suitable for this, although some can be used particularly economically. Die-cast aluminum and zinc have proven themselves extremely well for this application, because here high thermal conductivity and economical producibility are combined in the die-casting process.
  • elevations are provided in the surface of the thread take-off nozzle which is in contact with the thread. These elevations "pluck” the yarn and cause hairiness by partially loosening fibers from the fiber edge layer.
  • FIG. 2 shows elevations designed as webs 7 in plan view. But they can also be provided as spherical or pin-shaped elevations in the thread course. Depending on the character of the thread, different geometric shapes are suitable. The number of surveys can also vary.
  • Fig. 1 is an insert in the thread run or thread take-off channel 4 8, the surface 81 of which can optionally be subjected to wear protection measures.
  • This insert 8 is expediently made of steel. In this respect, this is more appropriate than other solutions such.
  • B. ceramics since steel is more economical to produce and allows a wide range of surface treatments, each of which can be tailored to the characteristics of the material to be spun. For example, case hardening is an inexpensive, simple and effective wear protection measure.
  • notches 6 recesses expediently raise the u. a. due to the rotation of the rotor 5 during spinning so-called false twist in the spun thread 9 partly due to the fact that they trigger a brief lifting of the thread from the surface of the mouth funnel 12 and give the yarn the possibility of losing internal tension.
  • the present invention enables the use of more economical and long-lasting thread draw-off nozzles 1 in open-end spinning devices than before.
  • the assignment of tasks to materials that are especially suitable for the respective requirements, such as wear resistance, corrosion resistance and thermal conductivity, and their interaction makes it stable and constant Spinning possible.
  • the invention is not limited to the exemplary embodiments shown here, but can be embodied in further expedient configurations.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

In an open-end spinning machine, there is a yarn draw-off nozzle which is so designed that it has an especially high heat dissipation capacity. The yarn draw-off nozzle therefore has a basic body consisting of a thermally conductive material, to which the yarn-guiding surfaces made of wear-resistant material are attached. Various alloys are provided for the basic body.

Description

Die Erfindung betrifft eine Offenendspinnvorrichtung mit einer Fadenabzugsdüse.The invention relates to an open-end spinning device with a thread draw-off nozzle.

Aus der DE-OS 25 44 721 ist bekannt, wegen des nicht vertretbaren Verschleißes durch den Fadenlauf, Fadenabzugsdüsen von Offenendspinnvorrichtungen aus verschleißarmen Materialien einzusetzen, um eine höhere Standzeit der Vorrichtungen und bessere, konstante Spinnbedingungen zu erreichen.From DE-OS 25 44 721 it is known to use thread take-off nozzles of open-end spinning devices made of low-wear materials because of the unacceptable wear caused by the thread run, in order to achieve a longer service life of the devices and better, constant spinning conditions.

Es wurde auch in der DE-PS 30 16 675 vorgeschlagen, Offenendspinnvorrichtungen mit Abzugsdüsen zu versehen, deren Oberflächen durch Beschichtungen widerstandsfähig gemacht wurden.It was also proposed in DE-PS 30 16 675 to provide open-end spinning devices with take-off nozzles, the surfaces of which were made resistant by coatings.

Bei der zunehmenden Steigerung der Rotorbetriebsdrehzahlen haben sich beim Verspinnen Schwierigkeiten ergeben durch höhere Fadenbruchzahlen, Verschmutzung der Abzugsdüsen und auch erhöhten Verschleiß derselben. Man hat diesen Schwierigkeiten entgegengewirkt durch besondere Ausbildung der Fadenabzugsdüse, um eine bessere Fortpflanzung der Drehung zum Einbindepunkt zu erreichen, da man der Meinung war, daß diese Fadenbrüche allein auf mangelnde Drehungsfortplanzung in den Faserring begründet ist. Diese Maßnahmen haben zu einer erhöhten Beanspruchung der Fadenabzugsdüse nicht nur durch die höheren Geschwindigkeiten geführt. Um dem Verschleiß der Abzugsdüsen entgegenzuwirken, insbesondere auch bei bestimmten Synthetikmaterialen und Avivagen wurden deshalb die fadenführenden Teile aus verschleißfestem Material in der Weise ausgebildet, daß ein Keramikeinsatz in die sonst aus härtbaren oder gehärtetem Stahl bestehende Fadenabzugsdüse eingesetzt wurde. Dadurch konnte erreicht werden, daß die Standzeit der Düsen und damit die Arbeitsfähigkeit dieser Fadenabzugsdüsen erheblich verbessert worden ist. Dennoch konnten Schwierigkeiten beim Spinnen, insbesondere eine erhöhte Fadenbruchzahl nicht beseitigt werden.With the increasing increase in rotor operating speeds, difficulties have arisen during spinning due to higher thread break counts, contamination of the take-off nozzles and also increased wear and tear on the same. These difficulties have been counteracted by special design of the thread take-off nozzle in order to achieve a better propagation of the twist to the attachment point, since it was believed that these thread breaks solely due to a lack of twist propagation in the fiber ring is justified. These measures have led to increased stress on the thread take-off nozzle not only due to the higher speeds. In order to counteract the wear of the take-off nozzles, in particular also with certain synthetic materials and finishing agents, the thread-guiding parts were therefore made of wear-resistant material in such a way that a ceramic insert was inserted into the thread take-off nozzle, which was otherwise made of hardenable or hardened steel. This made it possible to considerably improve the service life of the nozzles and thus the operability of these thread take-off nozzles. However, difficulties with spinning, in particular an increased number of thread breaks, could not be eliminated.

Überraschenderweise hat sich nun gezeigt, daß für diese erhöhten Fadenbruchzahlen und Schwierigkeiten beim Spinnen in der Auswirkung auf die Garnqualität gar nicht allein die Drehungsfortpflanzung Einfluß hat, sondern daß die Ursache hierfür eine an der Fadenabzugsdüse entstehende unzulässige Temperaturerhöhung ist. Diese unzulässige Temperaturerhöhung entsteht dadurch, daß die durch die Reibung des Fadens entstehende Wärme nicht genügend abgeführt wird und sich somit ein Wärmestau bildet.Surprisingly, it has now been shown that for these increased numbers of thread breaks and difficulties in spinning, the effect on the yarn quality is not solely due to the propagation of twist, but that the cause of this is an inadmissible temperature increase occurring at the thread take-off nozzle. This impermissible increase in temperature arises from the fact that the heat generated by the friction of the thread is not dissipated sufficiently and heat build-up thus forms.

Durch diesen Wärmestau wird der Faden angegriffen, die Avivageschicht von den einzelnen Fasern des durch die heiße Abzugsdüse laufenden Fadens gelöst und die Fasern verlieren ihre Schutzschicht. Dadurch wird ein ungleichmäßiges Garn produziert und es entstehen häufige Fadenbrüche nicht nur beim Spinnen sondern auch bei der Weiterverarbeitung. Ferner werden durch den erhöhten Abrieb im Bereich der Abzugsdüse die fadenführenden Flächen verschmutzt, was ebenfalls zu Fadenbrüchen und damit unnötigem Produktionsausfall führt. Ohne gründliche Reinigung der Fadenabzugsdüse ist ein Wiederanspinnen meist nicht möglich, ganz abgesehen davon, daß durch diese erhöhte Temperatur die Gefahr des Schmelzens des synthetischen Fasermaterials gegeben ist.The heat is attacked by the thread, the aviva layer by the individual fibers through the hot extraction nozzle loose thread and the fibers lose their protective layer. This produces an uneven yarn and there are frequent thread breaks not only during spinning but also during further processing. Furthermore, the thread-bearing surfaces are soiled by the increased abrasion in the area of the take-off nozzle, which likewise leads to thread breaks and thus unnecessary loss of production. Without thorough cleaning of the thread take-off nozzle, re-spinning is usually not possible, quite apart from the fact that this increased temperature creates the risk of the synthetic fiber material melting.

Die Erfindung geht nun von der Erkenntnis aus, daß im Bereich der Fadenabzugsdüse insbesondere durch die verschleißfeste Ausbildung derselben ein Wärmestau entsteht, der sich nachteilig auf den gesamten Spinnprozeß und die Garnbildung auswirkt.The invention is based on the knowledge that in the area of the thread draw-off nozzle, in particular due to the wear-resistant design thereof, heat build-up occurs, which has a disadvantageous effect on the entire spinning process and the yarn formation.

Aufgabe der Erfindung ist es deshalb, diese Nachteile zu vermeiden. Die Lösung der Aufgabe erfolgt durch die Merkmale des Anspruchs 1. Das Neue und Erfinderische ist die Erkenntnis, daß an der Fadenabzugsdüse ein Wärmeproblem entsteht, was den Faden beeinflußt und damit die Spinnfähigkeit.The object of the invention is therefore to avoid these disadvantages. The problem is solved by the features of claim 1. What is new and innovative is the knowledge that a heat problem arises at the thread draw-off nozzle, which affects the thread and thus the spinning capacity.

Durch die wärmeableitfähige Ausbildung der Fadenabzugsdüse wird verhindert, daß sich die Fadenabzugsdüse aufheizt und es zu obengenannten Störungen des Spinnprozesses kommt.The heat-dissipating design of the thread draw-off nozzle prevents the thread draw-off nozzle from heating up and it to the above-mentioned disturbances in the spinning process.

Das Anbringen von fadenführenden Flächen aus verschleißfesten Materialien an dem Grundkörper ist eine vorteilhafte langlebige und verschleißfeste Ausbildung. Es ist in besonderer Weise von Vorteil, wenn der Grundkörper aus den Werkstoffen mit hoher Wärmeleitfähigkeit, wie beispielsweise Aluminium oder Zink besteht. Selbstverständlich sind auch andere Werkstoffe und Legierungen mit hoher Wärmeleitfähigkeit geeignet. Diese Werkstoffe sind außerdem besonders gut geeignet, wirtschaftlich, bei sehr geringen Kosten hergestellt werden zu können.Attaching thread-guiding surfaces made of wear-resistant materials to the base body is an advantageous, long-lasting and wear-resistant design. It is particularly advantageous if the base body consists of the materials with high thermal conductivity, such as aluminum or zinc. Of course, other materials and alloys with high thermal conductivity are also suitable. These materials are also particularly suitable, economical, and can be manufactured at very low costs.

Nahezu optimale Wärmeabfuhr von der Abzugsdüse an die Umgebung wird erreicht, wenn zwischen dem Grundkörper der Fadenabzugsdüse und dem weiterführenden Spinnkammerdeckel kein isolierendes Medium vorhanden ist.Almost optimal heat dissipation from the take-off nozzle to the surroundings is achieved if there is no insulating medium between the base body of the thread take-off nozzle and the further spinning chamber cover.

Desweiteren ist es von Vorteil, wenn bei einer Fadenabzugsdüse, die beispielsweise derart ausgebildet ist, daß sie sich, vom Spinnelement ausgehend, verjüngt und im - im wesentlichen zylindrischen - verjüngten, von der Spinnkammer wegzeigenden Teil der Fadenabzugsdüse ein Einsatz aus hartem Stahl vorgesehen ist, der die Vorteile der Verschleißfestigkeit mit den Vorteilen der Wärmeleitfähigkeit in sich kombiniert. Der durch die Fadenabzugsdüse laufende Faden berührt den zylindrischen Teil der Oberfläche mit einer bekannterweise wesentlich geringeren Anpreßkraft als den trichterförmigen. Es kann also hier eine gegenüber Keramik geringere Verschleißfestigkeit des Fadenabzugsdüsenmateriales ausreichend sein.Furthermore, it is advantageous if, in the case of a thread take-off nozzle which is designed, for example, in such a way that, starting from the spinning element, it tapers and an insert made of hard steel is provided in the - essentially cylindrical - tapered part of the thread take-off nozzle pointing away from the spinning chamber, which combines the advantages of wear resistance with the advantages of thermal conductivity. The thread running through the thread take-off nozzle touches the cylindrical one Part of the surface with a known lower contact pressure than the funnel-shaped. It may therefore be sufficient here for the thread draw-off nozzle material to have a lower wear resistance than ceramic.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der in den Zeichnungen dargestellten Ausführungsformen.Further features and advantages of the invention result from the following description of the embodiments shown in the drawings.

Es zeigen

  • Fig. 1 im Teilschnitt ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung im Bereich der Fadenabzugsdüse und
  • Fig. 2 eine Draufsicht der in der Fig. 1 gezeigten Fadenabzugsdüse.
Show it
  • Fig. 1 in partial section an embodiment of the device according to the invention in the area of the thread take-off nozzle and
  • Fig. 2 is a plan view of the thread take-off nozzle shown in Fig. 1.

Die in Fig. 1 dargestellte Offenendspinnvorrichtung besteht aus einem Rotor 5, in den eine pilzförmige Erhebung des Rotordeckels 3, welche die Fadenabzugsdüse 1 trägt, etwa zentrisch hineinragt. Der Rotor 5 ist von einem nicht gezeigten Rotorgehäuse umgeben, welches üblicherweise von einem Deckel - hier vom Rotordeckel 3 - dicht abgeschlossen wird und während des Spinnprozesses unter Unterdruck steht. Die durch den nicht gezeigten Faserspeisekanal in den Rotor 3 gelangenden Fasern werden unter dem Einfluß ihrer kinetischen Energie und der im Rotor herrschenden Kräfte in die Rotorrille 52 befördert, dort zu einem Faden 9 versponnen und über die Oberfläche 21 der Fadenabzugsdüse 1 aus dem Rotor 5 abgezogen und durch den Fadenabzugskanal 4 zu einer nicht gezeigten Speichervorrichtung befördert.The open-end spinning device shown in FIG. 1 consists of a rotor 5, into which a mushroom-shaped elevation of the rotor cover 3, which carries the thread take-off nozzle 1, projects approximately centrally. The rotor 5 is surrounded by a rotor housing, not shown, which is usually sealed off by a cover - here the rotor cover 3 - and is under negative pressure during the spinning process. The fibers entering the rotor 3 through the fiber feed channel (not shown) are influenced by their kinetic energy and of the forces prevailing in the rotor are conveyed into the rotor groove 52, spun there into a thread 9 and drawn off from the rotor 5 via the surface 21 of the thread take-off nozzle 1 and conveyed through the thread take-off channel 4 to a storage device (not shown).

Die Fadenabzugsdüse 1 ist im hier gezeigten Beispiel mit ihrem Grundkörper 11 mit nicht gezeigten üblichen Mitteln in dem dem Rotor 5 abgewandten Teil des Fadenabzugskanales 4, welcher sich im Rotordeckel 3 befindet, befestigt. Bei entsprechend ausreichendem Kontakt von Grundkörper 11 und Deckel 3 kann die Fadenabzugsdüse auch mit einem Gewinde versehen werden und in den Deckel 3 geschraubt werden.In the example shown here, the thread take-off nozzle 1 is fastened with its base body 11 by conventional means, not shown, in that part of the thread take-off channel 4 which faces away from the rotor 5 and which is located in the rotor cover 3. If there is sufficient contact between the base body 11 and the cover 3, the thread take-off nozzle can also be provided with a thread and screwed into the cover 3.

Die zum Inneren des Fadenabzugskanales 4 zeigende Oberfläche 111 der Fadenabzugsdüse 1 läuft im in Fig. 1 gezeigten Ausführungsbeispiel in Fadenabzugsrichtung, sich konisch erweiternd, aus, kann aber auch im wesentlichen zylindrisch ausgebildet werden. Die Oberfläche 111 kann wahlweise mit einer verschleißfesten Beschichtung versehen werden.In the exemplary embodiment shown in FIG. 1, the surface 111 of the thread take-off nozzle 1 pointing towards the inside of the thread take-off channel 4 tapers out in the direction of thread pulling out, but can also be designed essentially cylindrical. The surface 111 can optionally be provided with a wear-resistant coating.

Auf den Grundkörper 11 der Fadenabzugsdüse 1 ist das trichterförmige Mündungsstück 12 der Fadenabzugsdüse 1 aufgesetzt und zeigt in Richtung des Rotors 5. Dieser Mündungstrichter 12 ist z. B. aus keramischem Material und auf der Oberfläche 21 seiner Mündung poliert. Wird nun im betriebsmäßigen Spinnprozeß der Faden 9 vom Rotor 5 abgezogen und teilweise über die Oberflächen 21 und 111 geführt, so entsteht durch die dabei wirkende Reibung zwischen Faden 9 und den von Faden 9 berührten Oberflächen eine sehr hohe Erhitzung der Oberflächen, welche den Spinnprozeßablauf in kurzer Zeit verschlechtern würde, wenn die Temperatur nicht durch die aufgrund der hohen Wärmeleitfähigkeit des Grundkörpers 11 möglichen Wärmeabfuhr unter für Spinnbedingungen günstigen Werten gehalten würde.On the base body 11 of the thread draw-off nozzle 1, the funnel-shaped mouthpiece 12 of the thread draw-off nozzle 1 is placed and points in the direction of the rotor 5. B. made of ceramic material and polished on the surface 21 of its mouth. Will now be in the operational spinning process the thread 9 is withdrawn from the rotor 5 and partially guided over the surfaces 21 and 111, the resulting friction between the thread 9 and the surfaces touched by the thread 9 results in a very high heating of the surfaces, which would worsen the spinning process in a short time, if the temperature would not be kept below favorable values for spinning conditions due to the heat dissipation possible due to the high thermal conductivity of the base body 11.

Die in Fig. 1 gezeigte gegenseitige enge Anlage der miteinanderwirkenden Bauteile Mündungstrichter 12, Grundkörper 11 und Rotordeckel 3 sorgt für eine optimale Wärmeableitung zwischen den sich erhitzenden Regionen der Fadenabzugsdüse 1 und dem Rotordeckel 3 und von dort an die Umgebung. Die im Vergleich zur Fadenabzugsdüse 1 sehr große Masse des Rotordeckels 3 gibt die abzuführende Wärme an die Umgebung ab. Es wird dadurch ein stabiler und konstanter Spinnbetrieb ermöglicht. Eine Verschmutzung der Oberflächen 21 und 111 und dadurch verursachte Fadenbrüche werden vermieden. Nach einem aus irgendwelchen anderen Gründen entstandenen Fadenbruch ist ein Wiederanspinnen, bei dem es wesentlich auf die konstante Kondition der Oberflächen der Fadenabzugsdüse 1 ankommt, ohne Probleme möglich und nicht durch Verunreinigungen gestört.The mutual close contact shown in FIG. 1 of the interacting components of the mouth funnel 12, base body 11 and rotor lid 3 ensures optimum heat dissipation between the heating regions of the thread draw-off nozzle 1 and the rotor lid 3 and from there to the environment. The very large mass of the rotor cover 3 compared to the thread take-off nozzle 1 emits the heat to be dissipated to the surroundings. This enables a stable and constant spinning operation. Contamination of the surfaces 21 and 111 and thread breaks caused thereby are avoided. After a thread breakage which has arisen for any other reason, re-spinning, in which the constant condition of the surfaces of the thread take-off nozzle 1 is essential, is possible without problems and is not disturbed by impurities.

Der im Guß- oder Druckgußverfahren oder spanend hergestellte Grundkörper 11 der Fadenabzugsdüse 1 besteht aus einem Werkstoff, der eine hohe Wärmeleitfähigkeit lambda, wobei Werte von lambda > 80 W/mk zu bevorzugen sind, besitzt. Aber auch niedrigere Werte von lambda können, abhängig von der Rotordrehzahl und den jeweiligen Eigenschaften des zu verspinnenden Materials, für die notwendige Wärmeabfuhr ausreichend sein. Es eignen sich hierfür sämtliche Werkstoffe und Elemente, sowie deren Legierungen, die einen hohen Lambda-Wert haben, wobei sich Jedoch einige besonders wirtschaftlich einsetzen lassen. Aluminium- und Zinkdruckguß haben sich hervorragend für diesen Einsatz bewährt, denn hierbei paaren sich hohe Wärmeleitfähigkeit und wirtschaftliche Herstellbarkeit im Druckgußverfahren miteinander.The base body 11 of the thread draw-off nozzle 1, which is produced by casting or die casting or by machining, consists of a material, which has a high thermal conductivity lambda, values of lambda> 80 W / mk being preferred. However, lower values of lambda, depending on the rotor speed and the respective properties of the material to be spun, may also be sufficient for the necessary heat dissipation. All materials and elements, as well as their alloys, which have a high lambda value, are suitable for this, although some can be used particularly economically. Die-cast aluminum and zinc have proven themselves extremely well for this application, because here high thermal conductivity and economical producibility are combined in the die-casting process.

Um ein weiches Garn zu produzieren, werden beispielsweise nicht gezeigte Erhebungen in der vom Faden berührten Oberfläche der Fadenabzugsdüse vorgesehen. Diese Erhebungen "zupfen" das Garn und bewirken durch teilweises Lösen von Fasern aus der Faserrandschicht eine Haarigkeit.In order to produce a soft yarn, elevations, not shown, are provided in the surface of the thread take-off nozzle which is in contact with the thread. These elevations "pluck" the yarn and cause hairiness by partially loosening fibers from the fiber edge layer.

Fig. 2 zeigt in der Draufsicht als Stege 7 ausgeführte Erhebungen. Sie können aber auch als kugel- oder stiftförmige Erhebungen im Fadenlauf vorgesehen werden. Es eignen sich je nach Garncharakter unterschiedliche geometrische Formen. Auch die Anzahl der Erhebungen kann unterschiedlich sein.FIG. 2 shows elevations designed as webs 7 in plan view. But they can also be provided as spherical or pin-shaped elevations in the thread course. Depending on the character of the thread, different geometric shapes are suitable. The number of surveys can also vary.

In Fig. 1 ist im Fadenlauf oder Fadenabzugskanal 4 ein Einsatz 8 gezeigt, dessen Oberfläche 81 wahlweise Verschleißschutzmaßnahmen unterworfen werden kann. Dieser Einsatz 8, wird zweckmäßigerweise aus Stahl ausgeführt. Dies ist insofern zweckmäßiger als andere Lösungen wie z. B. Keramik, da Stahl wirtschaftlicher herstellbar ist und eine breite Palette von Oberflächenbehandlungen zuläßt, die jeweils auf die Eigenheiten des zu verspinnenden Materiales abgestimmt werden können. So ist beispielsweise eine Einsatzhärtung eine kostengünstige, einfache und wirkungsvolle Verschleißschutzmaßnahme.In Fig. 1 is an insert in the thread run or thread take-off channel 4 8, the surface 81 of which can optionally be subjected to wear protection measures. This insert 8 is expediently made of steel. In this respect, this is more appropriate than other solutions such. B. ceramics, since steel is more economical to produce and allows a wide range of surface treatments, each of which can be tailored to the characteristics of the material to be spun. For example, case hardening is an inexpensive, simple and effective wear protection measure.

Die in der Oberfläche 21 des Mündungstrichter 12 vorgesehen als Kerben 6 ausgebildeten Vertiefungen heben zweckmäßigerweise den u. a. durch die Rotation des Rotor 5 beim Spinnen entstehenden sogenannten Falschdrall im gesponnenen Faden 9 teilweise wieder auf, dadurch, daß sie ein kurzzeitiges Abheben des Fadens von der Oberfläche des Mündungstrichter 12 auslösen und dem Garn die Möglichkeit geben, innere Spannungen zu verlieren.The provided in the surface 21 of the mouth funnel 12 as notches 6 recesses expediently raise the u. a. due to the rotation of the rotor 5 during spinning so-called false twist in the spun thread 9 partly due to the fact that they trigger a brief lifting of the thread from the surface of the mouth funnel 12 and give the yarn the possibility of losing internal tension.

Die vorliegende Erfindung ermöglicht den Einsatz wirtschaftlicherer und langlebigerer Fadenabzugsdüsen 1 in Offenendspinnvorrichtungen als bisher. Durch die Aufgabenzuordnung an speziell für die jeweilige Anforderung wie Verschleißfestigkeit, Korrosionsfestigkeit und Wärmeleitfähigkeit geeignete Werkstoffe und deren Zusammenwirken ist ein stabiler und konstanter Spinnbetrieb möglich.The present invention enables the use of more economical and long-lasting thread draw-off nozzles 1 in open-end spinning devices than before. The assignment of tasks to materials that are especially suitable for the respective requirements, such as wear resistance, corrosion resistance and thermal conductivity, and their interaction makes it stable and constant Spinning possible.

Die Erfindung ist nicht auf die hier gezeigten Ausführungsbeispiele beschränkt, sondern kann in weiteren zweckmäßigen Ausgestaltungen ausgeführt werden.The invention is not limited to the exemplary embodiments shown here, but can be embodied in further expedient configurations.

Es ist beispielsweise sinnvoll, fadenführende oder -berührende Bauteile von Friktions- oder Luftspinnvorrichtungen oder anderen Spinnvorrichtungen in der erfindungsgemäßen Weise auszubilden.It is useful, for example, to design thread-guiding or touching components of friction or air spinning devices or other spinning devices in the manner according to the invention.

Claims (8)

Offenendspinnvorrichtung mit einer Fadenabzugsdüse, dadurch gekennzeichnet, daß die Fadenabzugsdüse 1 wärmeableitfähig ausgebildet ist.Open-end spinning device with a thread draw-off nozzle, characterized in that the thread draw-off nozzle 1 is heat-dissipating. Offenendspinnvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Fadenabzugsdüse einen Grundkörper aus wärmeleitfähigem Material aufweist, an den die fadenführenden Flächen aus verschleißfestem Material angebracht sind.Open-end spinning device according to claim 1, characterized in that the thread draw-off nozzle has a base body made of thermally conductive material, to which the thread-guiding surfaces made of wear-resistant material are attached. Offenendspinnvorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Grundkörper aus einer Zinklegierung besteht.Open-end spinning device according to claim 1 and 2, characterized in that the base body consists of a zinc alloy. Offenendspinnvorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Grundkörper aus einer Aluminiumlegierung besteht.Open-end spinning device according to claim 1 and 2, characterized in that the base body consists of an aluminum alloy. Offenendspinnvorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß der Grundkörper aus Guß oder Druckguß besteht.Open-end spinning device according to claim 3 or 4, characterized in that the base body consists of cast or die-cast. Offenendspinnvorrichtung mit einem die Spinnkammer abschließenden Deckel, nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Fadenabzugsdüse mit einer derart engen Passung in den Deckel eingepaßt ist, daß zwischen Fadenabzugsdüse und Deckel kein Luftspalt vorhanden ist.Open-end spinning device with a cover closing the spinning chamber according to one or more of claims 1 to 5, characterized in that the thread take-off nozzle is fitted into the cover with such a close fit that there is no air gap between the thread take-off nozzle and the cover. Offenendspinnvorrichtung nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Grundkörper einen rohrförmigen dünnwandigen Einsatz aus hartem Stahl aufweist.Open-end spinning device according to one or more of claims 1 to 6, characterized in that the base body has a tubular thin-walled insert made of hard steel. Offenendspinnvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Grundkörper beschichtet ist.Open-end spinning device according to claim 2, characterized in that the base body is coated.
EP91102072A 1990-03-09 1991-02-14 Yarn draw-off nozzle for an open-end spinning machine Expired - Lifetime EP0445554B1 (en)

Applications Claiming Priority (2)

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DE4007517 1990-03-09
DE4007517A DE4007517A1 (en) 1990-03-09 1990-03-09 OPENING SPINNING DEVICE

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EP0445554A2 true EP0445554A2 (en) 1991-09-11
EP0445554A3 EP0445554A3 (en) 1991-11-13
EP0445554B1 EP0445554B1 (en) 1996-09-25

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Cited By (3)

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US5321943A (en) * 1991-06-12 1994-06-21 Spindelfabrik Suessen, Schurr, Stahlecker & Grill Gmbh Yarn withdrawal nozzle for open-end spinning arrangements
CZ297892B6 (en) * 1997-09-03 2007-04-25 W. Schlafhorst Ag & Co. Yarn take-off nozzle
CN112011858A (en) * 2019-05-29 2020-12-01 里特机械公司 Twisting element for a spinning nozzle of an air spinning machine and spinning nozzle

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DE4411972A1 (en) * 1994-04-07 1995-10-12 Schlafhorst & Co W Open=end spinning appts.
DE19901147B4 (en) * 1999-01-14 2010-04-08 Maschinenfabrik Rieter Ag Garnabzugsdüse for an open-end rotor spinning device
DE10224205A1 (en) 2002-05-31 2003-12-11 Schlafhorst & Co W Channel plate adapter for an open-end spinning device
AT501063A2 (en) * 2004-11-17 2006-06-15 Rieter Ingolstadt Spinnerei THREAD TAP FOR SPINNING MACHINES
DE102011002972A1 (en) 2010-06-25 2011-12-29 Rieter Ingolstadt Gmbh off nozzle
CZ2012591A3 (en) * 2012-08-30 2014-03-12 Rieter Cz S.R.O. Rotor spinning machine spinning apparatus

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DE3016675A1 (en) * 1980-04-30 1981-11-05 W. Schlafhorst & Co, 4050 Mönchengladbach OPEN-END SPIDER
DE3419300A1 (en) * 1984-05-24 1985-11-28 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Yarn draw-off tube
DE3609114A1 (en) * 1986-03-19 1987-09-24 Schlafhorst & Co W Open=end spinner

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5321943A (en) * 1991-06-12 1994-06-21 Spindelfabrik Suessen, Schurr, Stahlecker & Grill Gmbh Yarn withdrawal nozzle for open-end spinning arrangements
CZ297892B6 (en) * 1997-09-03 2007-04-25 W. Schlafhorst Ag & Co. Yarn take-off nozzle
CN112011858A (en) * 2019-05-29 2020-12-01 里特机械公司 Twisting element for a spinning nozzle of an air spinning machine and spinning nozzle
CN112011858B (en) * 2019-05-29 2023-12-08 里特机械公司 Twisting element for spinning nozzle of air spinning machine and spinning nozzle

Also Published As

Publication number Publication date
DE59108215D1 (en) 1996-10-31
EP0445554A3 (en) 1991-11-13
EP0445554B1 (en) 1996-09-25
DE4007517A1 (en) 1991-09-12

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