EP1375711B1 - 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
EP1375711B1
EP1375711B1 EP03009160A EP03009160A EP1375711B1 EP 1375711 B1 EP1375711 B1 EP 1375711B1 EP 03009160 A EP03009160 A EP 03009160A EP 03009160 A EP03009160 A EP 03009160A EP 1375711 B1 EP1375711 B1 EP 1375711B1
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European Patent Office
Prior art keywords
yarn
contact surface
flat areas
grooves
open
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EP03009160A
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German (de)
French (fr)
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EP1375711A3 (en
EP1375711A2 (en
Inventor
Gerd Stahlecker
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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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 a Garnabzugsdüse for open-end spinning devices with a withdrawing yarn deflecting curved contact surface, which merges from a substantially planar end face in a substantially perpendicular thereto Garnabzugskanal, and arranged in the contact surface, line-shaped unevenness, which along its entire length the yarn to be withdrawn crossing at an acute crossing angle, which deviates significantly from 0 ° and 90 °.
  • the line-shaped unevennesses are formed as notches or ribs, which are arranged close to each other.
  • the bumps directed substantially tangentially to the muzzle converge in the muzzle.
  • tangential notches or ribs are provided in one embodiment for both directions of rotation. The notches or ribs are arranged so close to each other that the yarn always contacts one of the unevenness during the peeling.
  • Garnabzugsdüsen lead the spun yarn from the heart of the open-end spinning device, the so-called spinning rotor to the outside.
  • the formation of the Garnabzugsdüse itself has a great influence on the quality of the spun yarn and the spinning stability of the open-end spinning device.
  • the design of Garnabzugsdüse ultimately determines the spinning conditions in the spinning rotor. This is especially true with respect to the yarn twist that runs back from the spun yarn into the interior of a fiber collecting groove of the spinning rotor.
  • the application of bumps in the form of notches or protrusions has proven to be a suitable compromise solution here.
  • the withdrawn yarn thus receives a so-called false twist, which is the spinning stability is increased and interrupted periodically by "jumping back" from time to time.
  • a so-called false twist which is the spinning stability is increased and interrupted periodically by "jumping back" from time to time.
  • an increase in spin stability is often accompanied by a deterioration in the quality of the spun yarns.
  • the invention has for its object to provide a the aforementioned unevenness Garnabzugsdüse for a substantially radially deducted Garnabzugskanal yarn, which has good properties both in terms of spinning stability and in terms of yarn quality.
  • a yarn take-off die having a contact surface in which the false twisting effect is enhanced to increase spinning stability without the occurrence of fiber damage, as is known with the notched yarn take-off nozzles known in the art. Due to the inventive features, the yarn is unrolled continuously pulling on the edges of the bumps. The course of the unevenness according to the invention guarantees that - in the presence of bumps formed as notches - the yarn is not pulled into the notch base, but on the notched edges due to the radius of the contact surface undergoes a certain wrap, which amplifies the false twist effect of Garnabzugsdüse without damaging the fibers.
  • the aforementioned unevenness should be arranged so that the crossing angle with the yarn to be withdrawn is always between 15 ° and 45 °. It is particularly advantageous if the crossing angle over the entire length of the bumps is at least approximately constant. Although this requires an easy for the inventively designed bumps Curved curve, however, on the other hand leads to a particularly continuous introduction of force.
  • the direction of the crossing angle there are two possibilities for the direction of the crossing angle: starting from the area of the yarn withdrawal channel, the unevenness can point either in the direction of rotation of the yarn or counter to the direction of rotation.
  • the rotor cup 2 has a fiber sliding surface 7 that widens conically to a fiber collecting groove 6.
  • the hollow interior of the rotor cup 2 has its largest diameter.
  • the spinning rotor 1 can be pulled out through a front opening 8 of the rotor housing 5 to the operating side.
  • the opening 8 of the rotor housing 5 is closed together with the open front side 9 of the rotor cup 2 by a wegbewegbare cover 10.
  • the cover 10 then places itself with the interposition of a ring seal 11 to the rotor housing 5.
  • the cover 10 includes a fiber feed channel 12 located outside of the sign hee, which starts in an unillustrated manner, as known, on an opening roller and whose mouth 13 is directed against the fiber sliding surface 7. Due to the action of said negative pressure source fibers are shot through the Faserzu Foodkanal 12 against the Fasergleit Structure 7, from where they slide into the fiber collecting groove 6, there form a fiber ring and in a known manner as a yarn 14 in the axial direction of the shaft 3 in operation by the opening roller subtracted from.
  • the intake via the Faserzu Switzerlandkanal 12 transport air can flow through a Matterströmspalt 15 at the open front side 9 of the spinning rotor 1.
  • the spun, dot-dashed yarn shown 14 is first withdrawn from the fiber collecting groove 6 at least approximately in a plane lying to the shaft 3 normal plane of the spinning rotor 1 and then a Garnabzugskanal 17 Garnabzugsdüse 18 according to the drawing direction A by means of a pair of draw-off rollers, not shown, and a package, also not shown fed.
  • the Garnabzugskanal 17 is coaxial with the shaft 3 of the spinning rotor 1, so that the yarn 14 is deflected by the Garnabzugsdüse 18 by about 90 °, the yarn 14 in the said normal plane corresponding to the direction of rotation B crank-like, see also FIG. 2 ,
  • the Garnabzugsdüse 18 is screwed by means of an external thread 20 in a corresponding bore of the cover 10.
  • the deflecting of the yarn 14 from said normal plane in the Garnabzugskanal 17 is a funnel-shaped curved contact surface 21 which begins at a plane lying in the normal plane, substantially flat end surface 19.
  • the contact surface 21 is a circular arc-like curved surface, which immediately follows the smallest cross-section 22 of Garnabzugskanals 17.
  • the contact surface 21 forms in the illustrated axial section approximately a quarter circle with a radius of curvature, which is for example 3 mm.
  • the contact surface 21 is provided with line-shaped unevenness 23, which according to FIG. 3 as scores 24 or according to FIG. 4 can be formed as a bump-like projections.
  • the invention relates in particular to the configuration of these unevennesses 23 with the aim of producing a good quality yarn 14 with high spinning stability of the open-end spinning device.
  • adjacent unevennesses 23 are arranged so close to one another that the yarn 14 always contacts at least one unevenness 23, but preferably several unevennesses 23 at the same time.
  • the crossing angle ⁇ is advantageously between 15 ° and 45 °.
  • the unevenness 23, starting from the area of the Garnabzugskanals 17, have in the in FIG. 2 variant shown in the direction of rotation B of the yarn 14th
  • FIG. 5 a variant is described below in which the crossing angle ⁇ over the entire length of the unevenness 23 is at least approximately constant.
  • the bumps 23, starting from the region of the Garnabzugskanals 17, counter to the direction of rotation B of the yarn 14 point are provided.
  • the unevennesses 23 are formed as slightly curved curves, which means that at each point of an unevenness 23, the crossing angle ⁇ remains constant. In FIG. 5 is here indicated a plurality of such crossing angle ⁇ . Furthermore, it can be seen that adjacent unevennesses 23 are arranged so close to one another that the yarn 14 always contacts a plurality of unevennesses 23.

Abstract

An open-end spinning assembly has a curved funnel-shaped contact surface over which a thread is drawn. The surface has a flat end-face (19) translating over a convex (21) surface to a yarn withdrawal passage at 90 degrees to the end-face. The contact surface has linear grooves and ridges which cross the yarn (14) fibres at an acute angle over their entire length. Fibres are always in contact with adjacent grooves and ridges. The angle subtended between the fibres, grooves (23) and ridges is approx. constant. The grooves have a coarse helical pitch. The angle alpha at which the threads intersect the grooves is approx. constant and between 15 and 45. The angle of intersection is against the direction of yarn travel.

Description

Die Erfindung betrifft eine Garnabzugsdüse für Offenend-Spinnvorrichtungen mit einer ein abzuziehendes Garn umlenkenden gewölbten Kontaktfläche, die von einer im Wesentlichen ebenen Stirnfläche in einen im Wesentlichen senkrecht dazu verlaufenden Garnabzugskanal übergeht, und mit in der Kontaktfläche angeordneten, linienförmigen Unebenheiten, welche auf ihrer gesamten Länge das abzuziehende Garn unter einem spitzen Kreuzungswinkel kreuzen, der deutlich von 0° und 90° abweicht.The invention relates to a Garnabzugsdüse for open-end spinning devices with a withdrawing yarn deflecting curved contact surface, which merges from a substantially planar end face in a substantially perpendicular thereto Garnabzugskanal, and arranged in the contact surface, line-shaped unevenness, which along its entire length the yarn to be withdrawn crossing at an acute crossing angle, which deviates significantly from 0 ° and 90 °.

Bei einer Garnabzugsdüse der eingangs genannten Art ( DE 15 60 302 A ) sind die linienförmigen Unebenheiten als Kerben oder Rippen ausgebildet, die dicht nebeneinander angeordnet sind. Die im Wesentlichen tangential zur Rohrmündung gerichteten Unebenheiten laufen in der Rohrmündung zusammen. Das Garn, das gemäß der DE 15 60 302 A während des Abziehens ebenfalls tangential zur Rohrmündung läuft, fällt immer wieder mit der ganzen über die Kontaktfläche laufenden Garnlänge in die von Rippen oder Kerben gebildeten Unebenheiten. Um zu vermeiden, dass ein Austauschen der Garnabzugsdüse bei Änderungen der Drehrichtung des Spinnrotors erforderlich ist, sind bei einem Ausführungsbeispiel für beide Drehrichtungen tangentiale Kerben oder Rippen vorgesehen. Dabei sind die Kerben oder Rippen derart dicht beieinander angeordnet, dass das Garn während des Abziehens immer eine der Unebenheiten kontaktiert.In a Garnabzugsdüse of the aforementioned type ( DE 15 60 302 A ), the line-shaped unevennesses are formed as notches or ribs, which are arranged close to each other. The bumps directed substantially tangentially to the muzzle converge in the muzzle. The yarn, which according to the DE 15 60 302 A also runs tangentially to the muzzle during the withdrawal, repeatedly falls with the whole over the contact surface running yarn length into the bumps formed by ribs or notches. In order to avoid having to replace the Garnabzugsdüse with changes in the direction of rotation of the spinning rotor, tangential notches or ribs are provided in one embodiment for both directions of rotation. The notches or ribs are arranged so close to each other that the yarn always contacts one of the unevenness during the peeling.

Es ist auch eine Garnabzugsdüse für Offenend-Spinnvorrichtungen bekannt ( DE 37 07 526 A ), die eine ein abzuziehendes Garn umlenkende Kontaktfläche aufweist. Diese Kontaktfläche geht von einer im Wesentlichen ebenen Stirnfläche in einen im Wesentlichen senkrecht dazu verlaufenden Garnabzugskanal über. Die Kontaktfläche ist mit linienförmigen Unebenheiten in Form von spiralförmig verlaufenden Rippen versehen. Das Garn, das während des Abziehens in radialer Richtung zum Garnabzugskanal der Garnabzugsdüse laufen soll, kontaktiert in jeder Position wenigstens eine der Unebenheiten. Dabei kreuzt es die Unebenheiten unter einem über die Kontaktfläche variierenden Winkel, der nur in den Spiralabschnitten im Bereich der Mündung des Garnabzugskanals ein spitzer Winkel ist, der deutlich von 0° und von 90° abweicht.It is also known a Garnabzugsdüse for open-end spinning devices ( DE 37 07 526 A ) which has a contact surface which deflects a yarn to be drawn off. This contact surface merges from a substantially flat end face into a yarn withdrawal channel running substantially perpendicular thereto. The contact surface is provided with line-shaped unevenness in the form of spirally extending ribs. The yarn which is intended to run during the peeling in the radial direction to the Garnabzugskanal the Garnabzugsdüse contacted in each position at least one of the bumps. It crosses the bumps under a varying over the contact surface angle, which is an acute angle only in the spiral sections in the region of the mouth of Garnabzugskanals, which deviates significantly from 0 ° and 90 °.

Garnabzugsdüsen führen das ersponnene Garn vom Herzstück der Offenend-Spinnvorrichtung, dem sogenannten Spinnrotor, nach außen. Die Ausbildung der Garnabzugsdüse selbst hat einen großen Einfluss auf die Qualität des ersponnenen Garnes und auf die Spinnstabilität der Offenend-Spinnvorrichtung. Die Ausgestaltung der Garnabzugsdüse bestimmt letztlich die Spinnbedingungen im Spinnrotor. Dies gilt insbesondere hinsichtlich der Garndrehung, die vom ersponnenen Garn bis in das Innere einer Fasersammelrille des Spinnrotors zurückläuft. Das Anbringen von Unebenheiten in Form von Kerben oder Vorsprüngen hat sich hier als geeignete Kompromisslösung erwiesen. Das abgezogene Garn erhält dadurch einen sogenannten Falschdrall, der die Spinnstabilität erhöht und immer wieder periodisch unterbrochen wird, indem er von Zeit zu Zeit gewissermaßen "zurückspringt". Leider hat sich jedoch gezeigt, dass eine Erhöhung der Spinnstabilität häufig mit einer Qualitätsverschlechterung der ersponnenen Garne einhergeht.Garnabzugsdüsen lead the spun yarn from the heart of the open-end spinning device, the so-called spinning rotor to the outside. The formation of the Garnabzugsdüse itself has a great influence on the quality of the spun yarn and the spinning stability of the open-end spinning device. The design of Garnabzugsdüse ultimately determines the spinning conditions in the spinning rotor. This is especially true with respect to the yarn twist that runs back from the spun yarn into the interior of a fiber collecting groove of the spinning rotor. The application of bumps in the form of notches or protrusions has proven to be a suitable compromise solution here. The withdrawn yarn thus receives a so-called false twist, which is the spinning stability is increased and interrupted periodically by "jumping back" from time to time. Unfortunately, however, it has been found that an increase in spin stability is often accompanied by a deterioration in the quality of the spun yarns.

Der Erfindung liegt die Aufgabe zugrunde, eine die eingangs genannten Unebenheiten aufweisende Garnabzugsdüse für ein im Wesentlichen radial zum Garnabzugskanal abzuziehendes Garn zu schaffen, die sowohl hinsichtlich der Spinnstabilität als auch hinsichtlich der Garnqualität gute Eigenschaften aufweist.The invention has for its object to provide a the aforementioned unevenness Garnabzugsdüse for a substantially radially deducted Garnabzugskanal yarn, which has good properties both in terms of spinning stability and in terms of yarn quality.

Diese Aufgabe wird dadurch gelöst, dass das Garn während des Umlaufens um den Garnabzugskanal die Unebenheiten nur kreuzt und in jeder Position wenigstens eine Unebenheit kontaktiert.This object is achieved in that the yarn during the rotation around the Garnabzugskanal only crosses the bumps and contacted in each position at least one unevenness.

Mit den Merkmalen der Erfindung wird eine Garnabzugsdüse mit einer Kontaktfläche geschaffen, bei der sich der Falschdralleffekt zum Erhöhen der Spinnstabilität verstärkt, ohne dass Faserschädigungen auftreten, wie sie mit den in der Praxis bekannten gekerbten Garnabzugsdüsen bekannt sind. Auf Grund der Erfindungsmerkmale wird das Garn auf den Kanten der Unebenheiten kontinuierlich ziehend abgerollt. Der Verlauf der Unebenheiten gemäß der Erfindung garantiert, dass - bei Vorhandensein von als Kerben ausgebildeten Unebenheiten - das Garn nicht etwa in den Kerbgrund hineingezogen wird, sondern auf den Kerbkanten auf Grund des Radius der Kontaktfläche eine gewisse Umschlingung erfährt, welche die Falschdrallwirkung der Garnabzugsdüse verstärkt, ohne die Fasern zu schädigen.With the features of the invention, there is provided a yarn take-off die having a contact surface in which the false twisting effect is enhanced to increase spinning stability without the occurrence of fiber damage, as is known with the notched yarn take-off nozzles known in the art. Due to the inventive features, the yarn is unrolled continuously pulling on the edges of the bumps. The course of the unevenness according to the invention guarantees that - in the presence of bumps formed as notches - the yarn is not pulled into the notch base, but on the notched edges due to the radius of the contact surface undergoes a certain wrap, which amplifies the false twist effect of Garnabzugsdüse without damaging the fibers.

Die genannten Unebenheiten sollten so angeordnet sein, dass der Kreuzungswinkel mit dem abzuziehenden Garn ständig zwischen 15° und 45° liegt. Dabei ist es besonders vorteilhaft, wenn der Kreuzungswinkel über die gesamte Länge der Unebenheiten wenigstens annähernd konstant ist. Dies erfordert für die erfindungsgemäß gestalteten Unebenheiten zwar eine leicht geschwungene Kurve, führt jedoch andererseits zu einer besonders kontinuierlichen Krafteinleitung.The aforementioned unevenness should be arranged so that the crossing angle with the yarn to be withdrawn is always between 15 ° and 45 °. It is particularly advantageous if the crossing angle over the entire length of the bumps is at least approximately constant. Although this requires an easy for the inventively designed bumps Curved curve, however, on the other hand leads to a particularly continuous introduction of force.

Grundsätzlich gibt es für die Richtung des Kreuzungswinkels zwei Möglichkeiten: Ausgehend vom Bereich des Garnabzugskanals, können die Unebenheiten entweder in Umlaufrichtung des Garnes oder entgegen der Umlaufrichtung weisen.Basically, there are two possibilities for the direction of the crossing angle: starting from the area of the yarn withdrawal channel, the unevenness can point either in the direction of rotation of the yarn or counter to the direction of rotation.

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 stark vergrößerter Darstellung einen Axialschnitt durch einen Teil einer Offenend-Spinnvorrichtung mit einer erfindungsgemäßen Garnabzugsdüse,
  • Figur 2 eine Ansicht in Richtung des Pfeiles II der Figur 1 auf die ebenfalls stark vergrößert dargestellte Garnabzugsdüse,
  • Figur 3 in noch weiter vergrößerter Darstellung einen Ausschnitt aus Figur 2 entsprechend der Schnittfläche III-III, wobei die dargestellte Unebenheit als Kerbe ausgebildet ist,
  • Figur 4 eine Darstellung ähnlich Figur 3, wobei die Unebenheit als höckerartiger Vorsprung ausgebildet ist,
  • Figur 5 in ebenfalls stark vergrößerter Darstellung eine diagrammähnliche Teilansicht der Figur 2 zwecks Erläuterung einer besonders vorteilhaften Variante nach der Erfindung.
  • Die in Figur 1 nur teilweise dargestellte Offenend-Spinnvorrichtung enthält einen Spinnrotor 1, der aus einem Rotorteller 2 und einem darin eingepressten Schaft 3 besteht. Der Schaft 3 ist in nicht dargestellter Weise gelagert und angetrieben.
  • Der Rotorteller 2 rotiert bei Betrieb in einer Unterdruckkammer 4, die durch ein Rotorgehäuse 5 gebildet ist, welches in nicht dargestellter Weise an eine Unterdruckquelle angeschlossen ist.
Show it:
  • FIG. 1 in a greatly enlarged view an axial section through part of an open-end spinning device with a Garnabzugsdüse invention,
  • FIG. 2 a view in the direction of arrow II the FIG. 1 on the also greatly enlarged Garnabzugsdüse,
  • FIG. 3 in a further enlarged view of a section FIG. 2 corresponding to the sectional area III-III, wherein the illustrated unevenness is formed as a notch,
  • FIG. 4 a representation similar FIG. 3 wherein the unevenness is formed as a hump-like projection,
  • FIG. 5 in likewise greatly enlarged representation a diagrammelike partial view of FIG. 2 for the purpose of explaining a particularly advantageous variant according to the invention.
  • In the FIG. 1 Only partially shown open-end spinning device includes a spinning rotor 1, which consists of a rotor cup 2 and a pressed-in shaft 3. The shaft 3 is mounted and driven in a manner not shown.
  • The rotor cup 2 rotates during operation in a vacuum chamber 4, which is formed by a rotor housing 5, which is connected in a manner not shown to a vacuum source.

Der Rotorteller 2 weist eine sich konisch zu einer Fasersammelrille 6 erweiternde Fasergleitfläche 7 auf. In der Fasersammelrille 6 hat der hohle Innenraum des Rotortellers 2 seinen größten Durchmesser. Der Spinnrotor 1 lässt sich durch eine vordere Öffnung 8 des Rotorgehäuses 5 zur Bedienungsseite hin herausziehen. Bei Betrieb ist die Öffnung 8 des Rotorgehäuses 5 zusammen mit der offenen Vorderseite 9 des Rotortellers 2 durch eine wegbewegbare Abdeckung 10 verschlossen. Die Abdeckung 10 legt sich unter Zwischenschaltung einer Ringdichtung 11 dann an das Rotorgehäuse 5 an.The rotor cup 2 has a fiber sliding surface 7 that widens conically to a fiber collecting groove 6. In the fiber collecting groove 6, the hollow interior of the rotor cup 2 has its largest diameter. The spinning rotor 1 can be pulled out through a front opening 8 of the rotor housing 5 to the operating side. In operation, the opening 8 of the rotor housing 5 is closed together with the open front side 9 of the rotor cup 2 by a wegbewegbare cover 10. The cover 10 then places itself with the interposition of a ring seal 11 to the rotor housing 5.

Die Abdeckung 10 enthält einen außerhalb der Zeichenehene liegenden Faserzuführkanal 12, der in nicht dargestellter, weil bekannter Weise an einer Auflösewalze beginnt und dessen Mündung 13 gegen die Fasergleitfläche 7 gerichtet ist. Durch die Wirkung der genannten Unterdruckquelle werden bei Betrieb durch die Auflösewalze vereinzelte Fasern durch den Faserzuführkanal 12 gegen die Fasergleitfläche 7 geschossen, von wo sie in die Fasersammelrille 6 gleiten, dort einen Faserring bilden und in bekannter Weise als Garn 14 in axialer Richtung des Schaftes 3 abgezogen werden. Die über den Faserzuführkanal 12 angesaugte Transportluft kann über einen Überströmspalt 15 an der offenen Vorderseite 9 des Spinnrotors 1 abfließen.The cover 10 includes a fiber feed channel 12 located outside of the sign hee, which starts in an unillustrated manner, as known, on an opening roller and whose mouth 13 is directed against the fiber sliding surface 7. Due to the action of said negative pressure source fibers are shot through the Faserzuführkanal 12 against the Fasergleitfläche 7, from where they slide into the fiber collecting groove 6, there form a fiber ring and in a known manner as a yarn 14 in the axial direction of the shaft 3 in operation by the opening roller subtracted from. The intake via the Faserzuführkanal 12 transport air can flow through a Überströmspalt 15 at the open front side 9 of the spinning rotor 1.

Das ersponnene, strichpunktiert dargestellte Garn 14 wird zunächst aus der Fasersammelrille 6 wenigstens annähernd in einer zum Schaft 3 liegenden Normalebene des Spinnrotors 1 und anschließend über einen Garnabzugskanal 17 einer Garnabzugsdüse 18 gemäß der Abzugsrichtung A mittels eines nicht dargestellten Abzugswalzenpaares abgezogen und einer ebenfalls nicht dargestellten Auflaufspule zugeführt. Der Garnabzugskanal 17 liegt koaxial zum Schaft 3 des Spinnrotors 1, so dass das Garn 14 mittels der Garnabzugsdüse 18 um etwa 90° umgelenkt wird, wobei das Garn 14 in der genannten Normalebene entsprechend der Umlaufrichtung B kurbelartig umläuft, siehe auch Figur 2. Die Garnabzugsdüse 18 ist mittels eines Außengewindes 20 in eine entsprechende Bohrung der Abdeckung 10 eingeschraubt.The spun, dot-dashed yarn shown 14 is first withdrawn from the fiber collecting groove 6 at least approximately in a plane lying to the shaft 3 normal plane of the spinning rotor 1 and then a Garnabzugskanal 17 Garnabzugsdüse 18 according to the drawing direction A by means of a pair of draw-off rollers, not shown, and a package, also not shown fed. The Garnabzugskanal 17 is coaxial with the shaft 3 of the spinning rotor 1, so that the yarn 14 is deflected by the Garnabzugsdüse 18 by about 90 °, the yarn 14 in the said normal plane corresponding to the direction of rotation B crank-like, see also FIG. 2 , The Garnabzugsdüse 18 is screwed by means of an external thread 20 in a corresponding bore of the cover 10.

Dem Umlenken des Garnes 14 aus der genannten Normalebene in den Garnabzugskanal 17 dient eine trichterförmige gewölbte Kontaktfläche 21, die an einer in der Normalebene liegenden, im Wesentlichen ebenen Stirnfläche 19 beginnt. In dem in Figur 1 dargestellten Axialschnitt ist die Kontaktfläche 21 eine kreisbogenartige gewölbte Fläche, der unmittelbar der kleinste Querschnitt 22 des Garnabzugskanals 17 folgt. Die Kontaktfläche 21 bildet in dem dargestellten Axialschnitt in etwa einen Viertelkreis mit einem Krümmungsradius, der beispielsweise 3 mm beträgt.The deflecting of the yarn 14 from said normal plane in the Garnabzugskanal 17 is a funnel-shaped curved contact surface 21 which begins at a plane lying in the normal plane, substantially flat end surface 19. In the in FIG. 1 The axial section shown, the contact surface 21 is a circular arc-like curved surface, which immediately follows the smallest cross-section 22 of Garnabzugskanals 17. The contact surface 21 forms in the illustrated axial section approximately a quarter circle with a radius of curvature, which is for example 3 mm.

In an sich bekannter Weise ist die Kontaktfläche 21 mit linienförmigen Unebenheiten 23 versehen, die gemäß Figur 3 als Kerben 24 oder gemäß Figur 4 als höckartige Vorsprünge ausgebildet sein können. Speziell auf die Ausgestaltung dieser Unebenheiten 23 bezieht sich die Erfindung mit dem Ziel, bei hoher Spinnstabilität der Offenend-Spinnvorrichtung ein qualitativ gutes Garn 14 zu erzeugen.In known manner, the contact surface 21 is provided with line-shaped unevenness 23, which according to FIG. 3 as scores 24 or according to FIG. 4 can be formed as a bump-like projections. The invention relates in particular to the configuration of these unevennesses 23 with the aim of producing a good quality yarn 14 with high spinning stability of the open-end spinning device.

Wie insbesondere aus Figur 2 ersichtlich ist, kreuzen die linienförmigen Unebenheiten 23 auf ihrer gesamten Länge das abzuziehende Garn 14 unter einem spitzen Kreuzungswinkel α, der deutlich sowohl von 0° als auch von 90° abweicht. Zusätzlich jedoch sind benachbarte Unebenheiten 23 so dicht beieinander angeordnet, dass das Garn 14 stets mindestens eine Unebenheit 23, jedoch vorzugsweise mehrere Unebenheiten 23 gleichzeitig kontaktiert. Dadurch wird insbesondere erreicht, dass das abgezogene Garn 14 unter Mitwirkung des Radius der Kontaktfläche 21 an den Kanten der Unebenheiten 23 eine gewisse Umschlingung erfährt, ohne beispielsweise in den Kerbengrund hineingezogen zu werden. Der Kreuzungswinkel α liegt dabei vorteilhaft zwischen 15° und 45°. Die Unebenheiten 23, ausgehend vom Bereich des Garnabzugskanals 17, weisen bei der in Figur 2 dargestellten Variante in Umlaufrichtung B des Garnes 14.As in particular from FIG. 2 it can be seen, the line-shaped unevenness 23 over its entire length crossing the yarn 14 to be withdrawn at an acute crossing angle α, which deviates significantly both from 0 ° and 90 °. In addition, however, adjacent unevennesses 23 are arranged so close to one another that the yarn 14 always contacts at least one unevenness 23, but preferably several unevennesses 23 at the same time. As a result, it is achieved, in particular, that the withdrawn yarn 14, with the cooperation of the radius of the contact surface 21, experiences a certain wrap around at the edges of the unevenness 23, without being pulled into the notch bottom, for example. The crossing angle α is advantageously between 15 ° and 45 °. The unevenness 23, starting from the area of the Garnabzugskanals 17, have in the in FIG. 2 variant shown in the direction of rotation B of the yarn 14th

Es sei an dieser Stelle erwähnt, dass die Umlaufgeschwindigkeit B sehr viel größer ist als die Geschwindigkeit des Garnes 14 in Abzugsrichtung A.It should be noted at this point that the rotational speed B is much greater than the speed of the yarn 14 in the withdrawal direction A.

Anhand der diagrammartigen, stark vergrößert dargestellten Figur 5 wird nachfolgend eine Variante beschrieben, bei welcher der Kreuzungswinkel α über die gesamte Länge der Unebenheiten 23 wenigstens annähernd konstant ist. Zusätzlich ist, abweichend von Figur 2, vorgesehen, dass die Unebenheiten 23, ausgehend vom Bereich des Garnabzugskanals 17, entgegen der Umlaufrichtung B des Garnes 14 weisen.Based on the diagram-like, greatly enlarged FIG. 5 a variant is described below in which the crossing angle α over the entire length of the unevenness 23 is at least approximately constant. In addition, different from FIG. 2 , Provided that the bumps 23, starting from the region of the Garnabzugskanals 17, counter to the direction of rotation B of the yarn 14 point.

Zwischen den in Figur 5 erkennbaren beiden Viertelkreisen befindet sich die nur auszugsweise dargestellte Kontaktfläche 21, auf welcher lediglich drei linienförmige Unebenheiten, in Form von Kerben oder Vorsprüngen, dargestellt sind. Selbstverständlich ist die gesamte Kontaktfläche 21 mit solchen Unebenheiten 23 versehen. Man erkennt femer eine Momentaufnahme eines in Umlaufrichtung B umlaufenden, mit einer durchgezogenen Linie dargestellten Garnes 14, welches sich außerdem in Abzugsrichtung A bewegt. Strichpunktiert sind mit 14' und 14" zwei nachfolgende Momente des Garnes 14 dargestellt.Between the in FIG. 5 recognizable two quarter circles is only excerpts shown contact surface 21, on which only three line-shaped unevenness, in the form of notches or projections, are shown. Of course, the entire contact surface 21 is provided with such bumps 23. It also recognizes a snapshot of a circulating in the direction B, shown by a solid line yarn 14, which also moves in the withdrawal direction A. Dash-dotted two 14 'and 14 "moments of the yarn 14 are shown.

Man erkennt, dass die Unebenheiten 23 als leicht geschwungene Kurven ausgebildet sind, was dazu führt, dass an jeder Stelle einer Unebenheit 23 der Kreuzungswinkel α konstant bleibt. In Figur 5 ist hier eine Vielzahl solcher Kreuzungswinkel α angedeutet. Weiterhin ist erkennbar, dass benachbarte Unebenheiten 23 so dicht beieinander angeordnet sind, dass das Garn 14 stets mehrere Unebenheiten 23 kontaktiert.It can be seen that the unevennesses 23 are formed as slightly curved curves, which means that at each point of an unevenness 23, the crossing angle α remains constant. In FIG. 5 is here indicated a plurality of such crossing angle α. Furthermore, it can be seen that adjacent unevennesses 23 are arranged so close to one another that the yarn 14 always contacts a plurality of unevennesses 23.

Claims (5)

  1. Yarn withdrawal nozzle for an open-end spinning device with a curved contact surface deflecting a yarn to be withdrawn and merging from a substantially flat end face into a yarn withdrawal channel extending substantially vertically thereto, and with linear non-flat areas arranged in the contact surface which over their entire length intersect the yarn to be withdrawn at an acute intersection angle diverging considerably from 0° and 90°, characterized in that adjacent non-flat areas (23) are arranged so close together and are so aligned that the yarn (14) only intersects the non-flat areas (23) during movement around the yarn withdrawal channel and contacts at least one uneven area (23) in every position.
  2. Yarn withdrawal nozzle according to Claim 1, characterized in that the intersection angle (α) is between 15° and 45°.
  3. Yarn withdrawal nozzle according to Claim 1 or 2, characterized in that the intersection angle (α) is at least approximately constant over the entire length of the non-flat areas (23).
  4. Yarn withdrawal nozzle according to one of Claims 1 to 3, characterized in that the non-flat areas (23) extending from the region of the yarn draw-off channel (17) point in the movement direction (B) of the yarn (14) .
  5. Yarn withdrawal nozzle according to one of Claims 1 to 3, characterized in that the non-flat areas (23) extending from the region of the yarn withdrawal channel (17) point against the movement direction (B) of the yarn (14).
EP03009160A 2002-06-20 2003-04-19 Yarn draw-off nozzle for an open-end spinning machine Expired - Lifetime EP1375711B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10228504 2002-06-20
DE10228504A DE10228504A1 (en) 2002-06-20 2002-06-20 Yarn take-off nozzle for open-end spinning devices

Publications (3)

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EP1375711A2 EP1375711A2 (en) 2004-01-02
EP1375711A3 EP1375711A3 (en) 2004-05-12
EP1375711B1 true EP1375711B1 (en) 2010-01-20

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CN (1) CN1470691A (en)
AT (1) ATE455883T1 (en)
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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004013828B4 (en) * 2004-03-15 2007-03-15 Wilhelm Stahlecker Gmbh Garnabzugsdüse for an open-end rotor spinning device
DE102004036953B4 (en) * 2004-07-21 2012-11-08 Wilhelm Stahlecker Gmbh Garnabzugsdüse for an open-end rotor spinning device
DE102011120106A1 (en) * 2011-12-02 2013-06-06 Oerlikon Textile Gmbh & Co. Kg Cover element of an open-end spinning device for closing an evacuated, forwardly open rotor housing
DE102012108550A1 (en) * 2012-02-08 2013-08-08 Maschinenfabrik Rieter Ag Garnabzugseinheit a rotor spinning machine and method for producing a yarn using a rotor spinning machine
CN102747470B (en) * 2012-07-12 2015-07-08 宁波双盾纺织帆布实业有限公司 Twisting prevention head
CN106319697A (en) * 2016-11-15 2017-01-11 江苏普美纺织有限公司 Rotor spinning false twister
CN106319696A (en) * 2016-11-15 2017-01-11 江苏普美纺织有限公司 Rotor spinning false twister

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1560302C3 (en) * 1966-08-24 1981-11-26 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Open-end spinning device
DE3707526A1 (en) * 1987-03-09 1988-09-29 Vnii Legkogo Textil Masch UNIT FOR RINGLESS SPINNING
DE4224632B4 (en) * 1992-07-25 2004-05-27 Saurer Gmbh & Co. Kg Device for open-end spinning
DE19738382B4 (en) * 1997-09-03 2006-03-09 Saurer Gmbh & Co. Kg off nozzle

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Publication number Publication date
EP1375711A3 (en) 2004-05-12
CN1470691A (en) 2004-01-28
ATE455883T1 (en) 2010-02-15
EP1375711A2 (en) 2004-01-02
DE10228504A1 (en) 2004-01-08

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