EP0227688B1 - Open-end spinning device - Google Patents

Open-end spinning device Download PDF

Info

Publication number
EP0227688B1
EP0227688B1 EP85905770A EP85905770A EP0227688B1 EP 0227688 B1 EP0227688 B1 EP 0227688B1 EP 85905770 A EP85905770 A EP 85905770A EP 85905770 A EP85905770 A EP 85905770A EP 0227688 B1 EP0227688 B1 EP 0227688B1
Authority
EP
European Patent Office
Prior art keywords
guide surface
friction
nip
roll
collecting groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85905770A
Other languages
German (de)
French (fr)
Other versions
EP0227688A1 (en
Inventor
Peter Artzt
Hans Rottmayr
Wolfgang Bauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rieter Ingolstadt Spinnereimaschinenbau AG
Original Assignee
Schubert und Salzer Maschinenfabrik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6250204&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0227688(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Schubert und Salzer Maschinenfabrik AG filed Critical Schubert und Salzer Maschinenfabrik AG
Publication of EP0227688A1 publication Critical patent/EP0227688A1/en
Application granted granted Critical
Publication of EP0227688B1 publication Critical patent/EP0227688B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • D01H4/04—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 contact of fibres with a running surface
    • D01H4/16—Friction spinning, i.e. the running surface being provided by a pair of closely spaced friction drums, e.g. at least one suction drum

Definitions

  • the invention relates to an open-end spinning device with two co-driven friction rollers forming a gusset, of which at least the friction roller screwing into the gusset is designed as a suction roller and conveys the fiber material fed onto its outer surface into the gusset, where the fibers are twisted into a thread .
  • entrained fibers are blown by blown air onto the jacket of a suction roller and conveyed by this into the spinning gusset, which the suction roller and a roller driven in the same direction as the suction roller form with a closed jacket surface (DE-OS-1 902111 , U.S. Patent 3-636-963).
  • the fibers are twisted in the spinning gusset by friction to form a yarn that is continuously drawn off.
  • the quality of the yarns produced on this device is unsatisfactory, especially at high spinning speeds.
  • the object of the present invention is to provide a device which enables the production of a yarn with higher uniformity and better dynamometric properties.
  • a collecting groove for the fed fiber material is provided at a distance from the spinning gusset, which is formed by the outer surface of the friction roller rotating into the spinning gusset and a moving guide surface, the surface speed of which in the collecting groove is aligned with the surface speed of the friction roller.
  • the fiber material is collected and summarized precisely and precisely.
  • the fibers fed in are pre-duplicated and fed to the spinning gusset in a very uniform formation, which has a favorable effect on the yarn quality.
  • the collecting groove is easily formed by a roller that is closely adjacent to the friction roller.
  • the guide surface rests on the bottom of the collecting groove on the surface of the friction roller.
  • the guide surface follows the surface of the friction roller right into the spinning gusset. This can be accomplished by making the guide surface the surface of an endless belt.
  • the guide surface is expediently pressed against the outer surface of the friction roller.
  • the moving guide surface is followed by a stationary guide surface.
  • the stationary guide surface expediently extends into the spider gusset.
  • the stationary guide surface is arranged at a distance from the moving guide surface forms an air flow directed onto the friction roller, by means of which the fibers are held on the friction roller.
  • This air flow can be intensified by the fact that the stationary guide surface has bores leading to the atmosphere.
  • the edge of the stationary guide surface facing the moving guide surface is rounded.
  • the stationary guide surface is arranged at a distance from the friction roller.
  • the fibers are preferably fed into the collecting groove in the longitudinal direction of the collecting groove, so that the fibers enter the spinning gusset parallel to the yarn axis and are bound to the rotating yarn end. This further improves the uniformity and strength of the yarn.
  • the friction roller has a negative pressure area which begins in the direction of rotation in front of the collecting groove and extends into the spinning gusset enough.
  • defined conditions for holding the fibers in place during their transport and in the spinning gusset are created in that the vacuum region of the friction roller is divided into at least two sections with different suction effects in the circumferential direction of the suction roller.
  • Good spinning conditions are achieved in that at least one of the friction rollers has a section of increased negative pressure in the spinning gusset in the region of the yarn formation zone.
  • the friction roller rotating into the spinning gusset expediently has a section of increased negative pressure.
  • This section is advantageously between 4 ulid 8 mm wide. A width of 6 mm has proven to be particularly favorable.
  • the twist and strength of the yarn are further improved in that the section extends about 1 mm beyond the axis connecting plane of the friction rollers to the side facing away from the spinning gusset.
  • An improvement also results if the center of the section lies in the axis connection plane of the friction rollers or in the circumferential direction away from the axis connection plane in the direction on the side facing away from the spinning gusset. Characterized in that a portion of low negative pressure adjoins the section of increased negative pressure in the friction roller turning into the spinning gusset, the air consumption of the device is reduced without the safe fiber transport on the friction roller being impaired thereby.
  • Fig. 1 shows two friction rollers 1 and 2, both of which are designed as suction rollers.
  • the parallel and closely arranged friction rollers 1 and 2 form a spinning gusset 3, in which fed fibers are turned into a yarn.
  • the friction rollers 1 and 2 are driven in the same direction in a manner not shown.
  • the friction rollers 1 and 2 have a perforated outer surface 10 and 20 and are provided with a suction insert 11 and 21 connected to a suction device (not shown).
  • the suction inserts 11 and 21 have in the area of the spinning gusset 3 a slot 12 and 22 which extends in the longitudinal direction of the spinning gusset 3 and through which a suction air flow is generated.
  • the vacuum range of the friction roller 1 rotating into the spinning gusset 3 extends from a boundary wall 15 to the spinning gusset 3 and ends there at a boundary wall 14 Boundary wall 15 is arranged in the direction of rotation of the friction roller 1 in front of a collecting groove 4, which will be described in more detail below.
  • the negative pressure area of the friction roller 1 is divided by a partition 13 into two sections I and II with different suction effects, the section I forming the slot 12 expediently having a higher negative pressure in the yarn formation area.
  • the vacuum in section II is only intended to ensure that the fibers are securely held on the friction roller 1 during their transport to the spinning gusset 3 and are dimensioned accordingly low. In contrast, the vacuum in section I must be so high that proper spinning is guaranteed.
  • the portion I forming the slot 12 has a width a between 4 and 8 mm, preferably a width a of 6, in the circumferential direction mm and extends about 1 mm beyond the axis connection plane A of the friction rollers 1 and 2 to the side facing away from the spinning gusset 3.
  • this also applies to the slot 22 of the suction roll 2 opposite section I.
  • the yarn strength has also increased if the middle of the section lies in the axis connection plane A (FIG. 4) or approximately 1 mm away from the axis connection plane A in the direction of the side facing away from the spider gusset 3. This is indicated in Fig. 4 by the broken line.
  • the above-mentioned collecting groove 4, in front of which the negative pressure area of section II begins, is formed by the outer surface 10 of the friction roller 1 turning into the spider gusset 3 and a moving guide surface 50.
  • this guide surface 50 is the surface of a rotatably mounted roller 5, which is arranged so close to the friction roller 1 that the guide surface 50 rests on the bottom of the collecting groove 4 on the friction roller 1.
  • the roller 5, which can have an elastic covering, is driven by the friction roller 1, the surface speed of the guide surface 50 in the collecting groove 4 being aligned with the surface speed of the friction roller 1. If appropriate, the roller 5 is pressed against the friction roller 1, for example by spring force .
  • the movable guide surface 50 is followed by a stationary guide surface 60, which is formed by the surface of the housing part 6 lying between the friction rollers 1 and 2 and the roller 5 facing the friction roller 1.
  • the guide surface 60 follows the contour of the friction roller 1 at a distance into the spinning gusset 3 and is also at a distance from the movable guide surface 50. This allows an air flow to form between the roller 5 and the housing part 6 to the friction roller 1, which holds the Fibers on the friction roller 1 is required and also prevents fibers from being taken along by the roller 5.
  • the air flow to the friction roller 1 is further increased by bores 61 in the stationary guide surface 60, which lead to the atmosphere.
  • the edge 62 of the stationary guide surface 60 facing the moving guide surface 50 is rounded.
  • the fiber material to be spun is prepared in the usual way as a sliver before dissolving direction (not shown), which it dissolves in individual fibers.
  • the individual fibers are fed through a fiber channel 7 (FIG. 2) into the collecting groove 4, in which they are collected and combined into a fiber formation.
  • the fiber formation retained by the suction air flow on the lateral surface 10 of the friction roller 1 receives greater cohesion and inevitable guidance when leaving the collecting groove 4 due to the moving guide surface 50 resting on the lateral surface 10, which is then taken over by the stationary guide surface 60 into the spider gusset 3 becomes. In this way, a pre-duplicated, uniform fiber formation reaches the spinning gusset 3, which improves the yarn quality.
  • a further improvement in the yarn values is achieved if the fibers are fed into the collecting groove 4 in the longitudinal direction.
  • This type of feeding is indicated in FIG. 1 by a fiber channel 70.
  • the fibers arrive in parallel with the yarn axis in the spinning gusset 3, which is extremely favorable for the fibers to be properly incorporated into the rotating free yarn end and their uniform arrangement in the yarn.
  • an angular position between the longitudinal and transverse directions can also be provided.
  • the friction roller 1 from FIG. 1 which rotates into the spinning gusset 3 and is designed as a suction roller is retained.
  • the second friction roller 2 ' which forms the spinning gusset 3 with the friction roller 1, is not perforated and is not vacuumed.
  • the collecting groove 4 is formed by the outer surface 10 of the friction roller 1 and an endless belt 8.
  • the surface of the endless belt 8 forms a moving guide surface 80 which extends into the spider gusset 3.
  • the endless belt 8 is guided over deflection rollers 81, 82 and 83 and is pressed by at least one pressure roller 84 against the outer surface 10 of the friction roller 1, so that the guide surface 80 rests on the outer surface 10 at the bottom of the collecting groove 4.
  • the contact pressure of the pressing rott 84 is increased by a spring, so that the endless belt 8 is safely driven by the friction roller 1, the surface speed of the guide roller 80 in the collecting groove 4 being aligned with the surface speed of the friction roller 1.

Abstract

An open-end spinning device with friction rolls (1, 2) driven in the same direction, which form a spinning gap, of which at least the friction roll (1) that rotates into the spinning groove is designed as a suction roll and conveys into the spinning gap (3) the fibre material which is fed on to its external surface. According to the invention, a collector channel is provided at a distance from the spinning gap for the fibre which has been fed in, the channel being formed by the external surface of the friction roll rotating into the spinning gap and a movable guide surface (50). In this way, the superficial speed of the guide surface in the collector channel is adapted to match the superficial speed of the friction roll.

Description

Die Erfindung betrifft eine Offenend-Spinnvorrichtung mit zwei gleichsinnig angetriebenen, einen Spinnzwickel bildenden Friktionswalzen, von denen wenigstens die in den Spinnzwickel hineindrehende Friktionswalze als Saugwalze ausgebildet ist und das auf ihre Mantelfläche gespeiste Fasermaterial in den Spinnzwickel fördert, wo die Fasern zu einem Faden zusammengedreht werden.The invention relates to an open-end spinning device with two co-driven friction rollers forming a gusset, of which at least the friction roller screwing into the gusset is designed as a suction roller and conveys the fiber material fed onto its outer surface into the gusset, where the fibers are twisted into a thread .

Bei einer bekannten Vorrichtung werden von einer Auflösevorrichtung mitgerissene Fasern durch Blasluft auf den Mantel einer Saugwalze geblasen und von dieser in den Spinnzwickel gefördert, den die Saugwalze und eine im gleichen Drehsinn wie die Saugwalze angetriebene Walze mit geschiossener Mantelfläche bilden (DE-OS-1 902111, US-PS-3-636-963). Die Fasern werden im Spinnzwickel durch Friktion zu einem Garn gedreht, das kontinuierlich abgezogen wird. Die Qualität der auf dieser Vorrichtung erzeugten Garne ist jedoch unbefriedigend, insbesondere bei hohen Spinngeschwindigkeiten.In a known device, entrained fibers are blown by blown air onto the jacket of a suction roller and conveyed by this into the spinning gusset, which the suction roller and a roller driven in the same direction as the suction roller form with a closed jacket surface (DE-OS-1 902111 , U.S. Patent 3-636-963). The fibers are twisted in the spinning gusset by friction to form a yarn that is continuously drawn off. However, the quality of the yarns produced on this device is unsatisfactory, especially at high spinning speeds.

Es ist ferner eine Offenend-Friktionsspinnvorrichtung bekannt, bei der die aufgelösten Fasern mittels eines Speisekanals, dessen Mündung in Umfangsrichtung der Saugwalze im Abstand zum Keilspalt oder Spinnzwickel der Mantelfläche der Saugwalze gegenüberliegt, auf die Mantelfläche gespeist werden (DE-OS-3 300 636). Der Rand der Mündung des Speisekanals ist als eine Umlenkführung ausgebildet, die eine Beschleunigung und Strekkung der Fasern bei ihrem Austritt aus dem Speisekanal bewirken soll. Diese Vorrichtung hat aber nicht den erwarteten Erfolg gebracht.There is also known an open-end friction spinning device, in which the dissolved fibers are fed onto the lateral surface by means of a feed channel, the mouth of which lies in the circumferential direction of the suction roll at a distance from the wedge gap or spider gusset on the lateral surface of the suction roll (DE-OS-3 300 636) . The edge of the mouth of the feed channel is designed as a deflection guide which is intended to accelerate and stretch the fibers as they exit the feed channel. However, this device has not achieved the expected success.

Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung zu schaffen, welche die Herstellung eines Garnes mit höherer Gleichmäßigkeit und besseren dynamometrischen Eigenschaften ermöglicht.The object of the present invention is to provide a device which enables the production of a yarn with higher uniformity and better dynamometric properties.

Die Aufgabe wird bei einer Vorrichtung gemäß dem Oberbegriff des Anspruches 1 erfindungsgemäß dadurch gelöst, daß in einem Abstand vom Spinnzwickel eine Sammelrille für das zugespeiste Fasermaterial vorgesehen ist, die durch die Mantelfläche der in den Spinnzwickel hineindrehenden Friktionswalze und eine bewegte Führungsfläche gebildet wird, deren Oberflächengeschwindigkeit in der Sammelrille gleichgerichtet mit der Oberflächengeschwindigkeit der Friktionswalze ist.The object is achieved in a device according to the preamble of claim 1 in that a collecting groove for the fed fiber material is provided at a distance from the spinning gusset, which is formed by the outer surface of the friction roller rotating into the spinning gusset and a moving guide surface, the surface speed of which in the collecting groove is aligned with the surface speed of the friction roller.

Durch die Ablage der Fasern in einer durch zwei bewegte Flächen gebildeten Sammelrille erfolgt eine exakte und definierte Sammlung und Zusammenfassung des Fasermaterials. Die zugespeisten Fasern werden vordubliert und in einer sehr gleichmäßigen Formation dem Spinnzwickel zugeführt, was sich günstig auf die Garnqualität auswirkt.By placing the fibers in a collecting groove formed by two moving surfaces, the fiber material is collected and summarized precisely and precisely. The fibers fed in are pre-duplicated and fed to the spinning gusset in a very uniform formation, which has a favorable effect on the yarn quality.

Die Sammelrille wird auf einfache Weise durch eine der Friktionswalze eng benachbarte Walze gebildet. In Weiterbildung der Vorrichtung wird vorgesehen, daß die Führungsfläche am Grund der Sammelrille auf der Oberfläche der Friktionswalze aufliegt. Um den Fasern nach ihrem Austritt aus der Sammelrille eine zusätzliche Führung zu geben, folgt die Führungsfläche der Oberfläche der Friktionswalze bis in den Spinnzwickel. Dies kann dadurch bewirkt werden, daß die Führungsfläche die Oberfläche eines endlosen Bandes ist. Zweckmäßg wird die Führungsfläche gegen die Mantelfläche der Friktionswalze gepreßt. In einer anderen vorteilhaften Ausführung ist der bewegten Führungsfläche eine ortsfeste Führungsfläche nachgeordnet. Zweckmäßig reicht dabei die ortsfeste Führungsfläche bis in den Spinnzwickel.The collecting groove is easily formed by a roller that is closely adjacent to the friction roller. In a further development of the device it is provided that the guide surface rests on the bottom of the collecting groove on the surface of the friction roller. In order to give the fibers an additional guide after they emerge from the collecting groove, the guide surface follows the surface of the friction roller right into the spinning gusset. This can be accomplished by making the guide surface the surface of an endless belt. The guide surface is expediently pressed against the outer surface of the friction roller. In another advantageous embodiment, the moving guide surface is followed by a stationary guide surface. The stationary guide surface expediently extends into the spider gusset.

Dadurch, daß die ortsfeste Führungsfläche in einem Abstand zur bewegten Führungsfläche angeordnet ist, bildet sich ein auf die Friktionswalze gerichteter Luftstrom aus, durch den die Fasern auf der Friktionswalze gehalten werden. Dieser Luftstrom kann noch dadurch verstärkt werden, daß die ortsfest Führungsfläche zur Atmosphäre führende Bohrungen aufweist. Um beim Übergang der Fasern von der bewegten zur ortsfesten Führungsfläche einen Faserstau und ein Abstreifen der Fasern von der Friktionswalze zu vermeiden, ist die der bewegten Führungsfläche zugewandte Kante der ortsfesten Führungsfläche abgerundet.The fact that the stationary guide surface is arranged at a distance from the moving guide surface forms an air flow directed onto the friction roller, by means of which the fibers are held on the friction roller. This air flow can be intensified by the fact that the stationary guide surface has bores leading to the atmosphere. In order to avoid fiber jamming and stripping of the fibers from the friction roller during the transition of the fibers from the moving to the stationary guide surface, the edge of the stationary guide surface facing the moving guide surface is rounded.

Ein störungsfreier Transport der Fasern zum Spinnzwickel wird dadurch ermöglicht, daß die ortsfeste Führungsfläche in einem Abstand zur Friktionswalze angeordnet ist. Vorzugsweise erfolgt die Zuspeisung der Fasern in die Sammelrille in Längsrichtung der Sammelrille, so daß die Fasern parallel zur Garnachse in den Spinnzwickel gelangen und an das rotierende Garnende angebunden werden. Dadurch wird die Gleichmäßigkeit und Festigkeit des Garnes weiter verbessert.Trouble-free transport of the fibers to the spinning gusset is made possible in that the stationary guide surface is arranged at a distance from the friction roller. The fibers are preferably fed into the collecting groove in the longitudinal direction of the collecting groove, so that the fibers enter the spinning gusset parallel to the yarn axis and are bound to the rotating yarn end. This further improves the uniformity and strength of the yarn.

Damit sich die Fasern schon beim Einspeisen in die Sammelrille auf der Friktionswalze absetzen können und auf der Friktionswalze während ihres Transportes in den Spinnzwickel sowie im Spinnzwickel gehalten werden, weist die Friktionswalze einen Unterdruckbereich auf, der in Drehrichtung vor der Sammelrille beginnt und bis in den Spinnzwickel reicht. Definierte Bedingungen zum Festhalten der Fasern während ihres Transportes und im Spinnzwickel werden dadurch geschaffen, daß der Unterdruckbereich der Friktionswalze in Umfangsrichtung der Saugwalze in wenigstens zwei Abschnitte mit unterschiedlicher Saugwirkung unterteilt ist.So that the fibers can settle on the friction roller as they are fed into the collecting groove and are held on the friction roller during their transport into the spinning gusset and in the spinning gusset, the friction roller has a negative pressure area which begins in the direction of rotation in front of the collecting groove and extends into the spinning gusset enough. Defined conditions for holding the fibers in place during their transport and in the spinning gusset are created in that the vacuum region of the friction roller is divided into at least two sections with different suction effects in the circumferential direction of the suction roller.

Gute Spinnbedingungen werden dadurch erreicht, daß im Spinnzwickel im Bereich der Garnbildungszone wenigstens eine der Friktionswalzen einen Abschnitt erhöhten Unterdruckes aufweist. Zweckmäßig weist die in den Spinnzwickel hineindrehende Friktionswalze einen Abschnitt erhöhten Unterdruckes auf. Vorteilhaft ist dieser Abschnitt zwischen 4-ulid 8 mm breit. Als besonders günstig hat sich eine Breite von 6 mm erwiesen. Die Drehung und Festigkeit des Garnes werden dadurch noch verbessert, daß sich der Abschnitt etwa um 1 mm über die Achsverbindungsebene der Friktionswalzen hinaus auf die dem Spinnzwickel abgewandten Seite erstreckt. Eine Verbesserung ergibt sich auch, wenn die Mitte des Abschnittes in der Achsverbindungsebene der Friktionswalzen oder in Umfangsrichtung entfernt von der Achsverbindungsebene in Richtung auf der dem Spinnzwickel abgewandten Seite liegt. Dadurch, daß bei der in den Spinnzwickel hineindrehenden Friktionswalze sich an den Abschnitt erhöhten Unterdruckes ein Abschnitt niedrigen Unterdruckes anschließt, wird der Luftverbrauch der Vorrichtung herabgesetzt, ohne daß dadurch der sichere Fasertransport auf der Friktionswalze beeinträchtigt wird.Good spinning conditions are achieved in that at least one of the friction rollers has a section of increased negative pressure in the spinning gusset in the region of the yarn formation zone. The friction roller rotating into the spinning gusset expediently has a section of increased negative pressure. This section is advantageously between 4 ulid 8 mm wide. A width of 6 mm has proven to be particularly favorable. The twist and strength of the yarn are further improved in that the section extends about 1 mm beyond the axis connecting plane of the friction rollers to the side facing away from the spinning gusset. An improvement also results if the center of the section lies in the axis connection plane of the friction rollers or in the circumferential direction away from the axis connection plane in the direction on the side facing away from the spinning gusset. Characterized in that a portion of low negative pressure adjoins the section of increased negative pressure in the friction roller turning into the spinning gusset, the air consumption of the device is reduced without the safe fiber transport on the friction roller being impaired thereby.

Zwei Ausführungsbeispiele der Erfindung werden nachstehend anhand der Zeichnungen beschrieben. Es zeigt

  • Fig.1 eine Ausführung der erfindungsgemäßen Spinnvorrichtung im Schnitt ;
  • Fig. 2 die Vorrichtung nach Fig. 1 in der Draufsicht ;
  • Fig. 3 eine andere Ausführung der erfindungsgemäßen Spinnvorrichtung im Schnitt ;
  • . Fig. 4 den Zwickelbereich zweier Friktionswalzen im Schnitt.
Two embodiments of the invention are described below with reference to the drawings. It shows
  • 1 shows an embodiment of the spinning device according to the invention in section;
  • Fig. 2 shows the device of Figure 1 in plan view.
  • Figure 3 shows another embodiment of the spinning device according to the invention in section.
  • . Fig. 4 shows the gusset area of two friction rollers in section.

Fig. 1 zeigt zwei Friktionswalzen 1 und 2, die beide als Saugwalzen ausgebildet sind. Die paratlel und eng nebeneinander angeordneten Friktionswalzen 1 und 2 bilden einen Spinnzwickel 3, in welchem zugespeiste Fasern zu einem Garn gedreht werden Hierzu werden die Friktionswalzen 1 und 2 in nicht näher dargestellter Weise gleichsinning angetrieben.Fig. 1 shows two friction rollers 1 and 2, both of which are designed as suction rollers. The parallel and closely arranged friction rollers 1 and 2 form a spinning gusset 3, in which fed fibers are turned into a yarn. For this purpose, the friction rollers 1 and 2 are driven in the same direction in a manner not shown.

Die Friktionswalzen 1 und 2 haben eine perforierte Mantelfläche 10 und 20 und sind mit einem an eine Saugvorrichtung (nicht gezeigt) angeschlossenen Saugeinsatz 11 und 21 versehen. Die Saugeinsätze 11 und 21 haben im Bereich des Spinnzwickels 3 einen sich in Längsrichtung des Spinnzwickels 3 erstreckenden Schlitz 12 und 22, durch den hindurch eine Saugluftströmung erzeugt wird. Während die aus dem Spinnzwickel 3 herausdrehende Friktionswalze 2 nur den durch die Breite des Schlitzes 22 vorgegebenen Unterdruckbereich aufweist, reicht der Unterdruckbereich der in den Spinnzwickel 3 hineindrehenden Friktionswalze 1 von einer Begrenzungswand 15 bis in den Spinnzwickel 3 und endet dort an einer Begrenzungswand 14. Die Begrenzungswand 15 ist in Drehrichtung der Friktionswalze 1 vor einer Sammelrille 4 angeordnet, die im folgenden noch näher beschrieben wird.The friction rollers 1 and 2 have a perforated outer surface 10 and 20 and are provided with a suction insert 11 and 21 connected to a suction device (not shown). The suction inserts 11 and 21 have in the area of the spinning gusset 3 a slot 12 and 22 which extends in the longitudinal direction of the spinning gusset 3 and through which a suction air flow is generated. While the friction roller 2 rotating out of the spinning gusset 3 only has the vacuum range predetermined by the width of the slot 22, the vacuum range of the friction roller 1 rotating into the spinning gusset 3 extends from a boundary wall 15 to the spinning gusset 3 and ends there at a boundary wall 14 Boundary wall 15 is arranged in the direction of rotation of the friction roller 1 in front of a collecting groove 4, which will be described in more detail below.

Der Unterdruckbereich der Friktionswalze 1 ist durch eine Trennwand 13 in zwei Abschnitte I und II mit unterschiedlicher Saugwirkung unterteilt, wobei zweckmäßig der den Schlitz 12 bildende Abschnitt I im Garnbildungsbereich höheren Unterdruck aufweist. Der Unterdruck im Abschnitt II soll lediglich sicherstellen, daß die Fasern während ihres Transportes zum Spinnzwickel 3 sicher auf der Friktionswalze 1 festgehalten werden und wird entsprechend niedrig bemessen. Dagegen mußt der Unterdruck im Abschnitt I so hoch sein, daß ein ordnungsgemäßes Spinnen gewährleistet ist. Dabei hat sich gezeigt, daß bei entsprechend bemessenem Unterdruck im Garnbildungsbereich G besonders gute Spinnergebnisse in Bezug auf die Garnfestigkeit dann erreicht werden, wenn der den Schlitz 12 bildende Abschnitt I in Umfangsrichtung eine Breite a zwischen 4 und 8 mm, vorzugsweise eine Breite a von 6 mm hat und sich um etwa 1 mm über die Achsverbindungsebene A der Friktionswalzen 1 und 2 hinaus auf die dem Spinnzwickel 3 abgewandte Seite erstreckt. Dies gilt beim Ausführungsbeispiel nach Fig. 1 auch für den dem Abschnitt I gegenüberliegenden Schlitz 22 der Saugwalze 2. Bei Versuchen hat sich eine Erhöhung der Garnfestigkeit auch ergeben, wenn die Mitte des Abschnittes in der Achsverbindungsebene A liegt (Fig.4) oder etwa 1 mm entfernt von der Achsverbindungsebene A in Richtung auf die dem Spinnzwickel 3 abgewandte Seite verlagert ist. Dies ist in Fig. 4 durch die unterbrochene Linie angedeutet.The negative pressure area of the friction roller 1 is divided by a partition 13 into two sections I and II with different suction effects, the section I forming the slot 12 expediently having a higher negative pressure in the yarn formation area. The vacuum in section II is only intended to ensure that the fibers are securely held on the friction roller 1 during their transport to the spinning gusset 3 and are dimensioned accordingly low. In contrast, the vacuum in section I must be so high that proper spinning is guaranteed. It has been shown that with a correspondingly dimensioned negative pressure in the yarn formation area G, particularly good spinning results with respect to the yarn strength are achieved when the portion I forming the slot 12 has a width a between 4 and 8 mm, preferably a width a of 6, in the circumferential direction mm and extends about 1 mm beyond the axis connection plane A of the friction rollers 1 and 2 to the side facing away from the spinning gusset 3. In the embodiment according to FIG. 1, this also applies to the slot 22 of the suction roll 2 opposite section I. In tests, the yarn strength has also increased if the middle of the section lies in the axis connection plane A (FIG. 4) or approximately 1 mm away from the axis connection plane A in the direction of the side facing away from the spider gusset 3. This is indicated in Fig. 4 by the broken line.

Die oben bereits erwähnte Sammelrille 4, vor welcher der Unterdruckbereich des Abschnittes II beginnt, wird durch die Mantelfläche 10 der in den Spinnzwickel 3 hineindrehenden Friktionswalze 1 und eine bewegte Führungsfläche 50 gebildet. In Fig. 1 ist diese Führungsfläche 50 die Oberfläche einer drehbar gelagerten Walze 5, die so dicht neben der Friktionswalze 1 angeordnet ist, daß die Führungsfläche 50 am Grund der Sammelrille 4 an der Friktionswalze 1 aufliegt. Die Walze 5, die einen elastischen Belag haben kann, wird durch die Friktionswalze 1 angetrieben, wobei die Oberflächengeschwindigkeit der Führungsfläche 50 in der Sammelrille 4 gleichgerichtet ist mit der Oberflächengeschwindigkeit der Friktionswalze 1. Gegebenenfalls wird die Walze 5 beispielsweise durch Federkraft an die Friktionswalze 1 gedrückt.The above-mentioned collecting groove 4, in front of which the negative pressure area of section II begins, is formed by the outer surface 10 of the friction roller 1 turning into the spider gusset 3 and a moving guide surface 50. In Fig. 1, this guide surface 50 is the surface of a rotatably mounted roller 5, which is arranged so close to the friction roller 1 that the guide surface 50 rests on the bottom of the collecting groove 4 on the friction roller 1. The roller 5, which can have an elastic covering, is driven by the friction roller 1, the surface speed of the guide surface 50 in the collecting groove 4 being aligned with the surface speed of the friction roller 1. If appropriate, the roller 5 is pressed against the friction roller 1, for example by spring force .

In Drehrichtung der Friktionswalze 1 ist der beweglichen Führungsfläche 50 eine ortsfeste Führungsfläche 60 nachgeordnet, die durch die der Friktionswalze 1 zugewandte Oberfläche eines zwischen den Friktionswalzen 1 und 2 und der Walze 5 liegenden Gehäuseteiles 6 gebildet wird. Die Führungsfläche 60 folgt in einem Abstand der Kontur der Friktionswalze 1 bis in den Spinnzwickel 3 und hat ferner einen Abstand zur beweglichen Führungsfläche 50. Dadurch kann sich zwischen der Walze 5 und dem Gehäuseteil 6 eine Luftströmung zur Friktionswalze 1 hin ausbilden, die zum Festhalten der Fasern auf der Friktionswalze 1 benötigt wird und außerdem verhindert, daß Fasern von der Walze 5 mitgenommen werden. Durch Bohrungen 61 in der ortsfesten Führungsfläche 60, die zur Atmosphäre führen, wird die Luftströmung zur Friktionswalze 1 noch verstärkt.In the direction of rotation of the friction roller 1, the movable guide surface 50 is followed by a stationary guide surface 60, which is formed by the surface of the housing part 6 lying between the friction rollers 1 and 2 and the roller 5 facing the friction roller 1. The guide surface 60 follows the contour of the friction roller 1 at a distance into the spinning gusset 3 and is also at a distance from the movable guide surface 50. This allows an air flow to form between the roller 5 and the housing part 6 to the friction roller 1, which holds the Fibers on the friction roller 1 is required and also prevents fibers from being taken along by the roller 5. The air flow to the friction roller 1 is further increased by bores 61 in the stationary guide surface 60, which lead to the atmosphere.

Um einen Faserstau beim Übergang der Fasern von der bewegten Führungsfläche 60 zu vermeiden, ist die der bewegten Führungsfläche 50 zugewandte Kante 62 der ortsfesten Führungsfläche 60 abgerundet.In order to avoid a fiber jam at the transition of the fibers from the moving guide surface 60, the edge 62 of the stationary guide surface 60 facing the moving guide surface 50 is rounded.

Das zu verspinnende Fasermaterial wird in üblicher Weise als Faserband einer Auflösevorrichtung (nicht gezeigt) zugeführt, die es in Einzelfasern auflöst. Die Einzelfasern werden durch einen Faserkanal 7 (Fig. 2) hindurch in die Sammelrille 4 gespeist, in der sie gesammelt und zu einer Faserformation zusammengefaßt werden. Die durch den Saugluftstrom auf der Mantelfläche 10 der Friktionswalze 1 festgehaltene Faserformation erhält beim Verlassen der Sammelrille 4 durch die auf der Mantelfläche 10 aufliegende bewegte Führungsfläche 50 einen stärkeren Zusammenhalt und eine zwangsläufige Führung, die anschließend von der ortsfesten Führungsfläche 60 bis in den Spinnzwickel 3 übernommen wird. Auf diese Weise gelangt eine vordublierte, gleichmäßige Faserformation in den Spinnzwickel 3, wodurch die Garnqualität verbessert wird.The fiber material to be spun is prepared in the usual way as a sliver before dissolving direction (not shown), which it dissolves in individual fibers. The individual fibers are fed through a fiber channel 7 (FIG. 2) into the collecting groove 4, in which they are collected and combined into a fiber formation. The fiber formation retained by the suction air flow on the lateral surface 10 of the friction roller 1 receives greater cohesion and inevitable guidance when leaving the collecting groove 4 due to the moving guide surface 50 resting on the lateral surface 10, which is then taken over by the stationary guide surface 60 into the spider gusset 3 becomes. In this way, a pre-duplicated, uniform fiber formation reaches the spinning gusset 3, which improves the yarn quality.

Eine weitere Verbesserung der Garnwerte wird erreicht, wenn die Fasern in Längsrichtung, der Sammelrille 4 in diese eingespeist werden. Diese Art der Einspeisung ist in Fig. durch einen Faserkanal 70 angedeutet. Die Fasern gelangen dadurch in Parallellage zur Garnachse in den Spinnzwickel 3, was für ein ordnungsgemäßes Einbinden der Fasern in das rotierende freie Garnende und ihre gleichmäßige Anordnung im Garn äußerst günstig ist. Selbstverständlich kann, wenn es zweckmäßig ist, auch eine Winkellage zwischen der Längs- und der Querrichtung vorgesehen werden.A further improvement in the yarn values is achieved if the fibers are fed into the collecting groove 4 in the longitudinal direction. This type of feeding is indicated in FIG. 1 by a fiber channel 70. As a result, the fibers arrive in parallel with the yarn axis in the spinning gusset 3, which is extremely favorable for the fibers to be properly incorporated into the rotating free yarn end and their uniform arrangement in the yarn. Of course, if it is expedient, an angular position between the longitudinal and transverse directions can also be provided.

Bei dem Ausführungsbeispiel gemäß Fig. ist die in den Spinnzwickel 3 hineindrehende und als Saugwalze ausgebildete Friktionswalze 1 aus Fig. beibehalten. Die zweite Friktionswalze 2', die mit der Friktionswalze 1 den Spinnzwickel 3 bildet, ist jedoch nicht perforiert und nicht besaugt. Die Sammelrille 4 wird durch die Mantelfläche 10 der Friktionswalze 1 und ein endloses Band 8 gebildet. Die Oberfläche des endlosen Bandes 8 bildet eine bewegte Führungsfläche 80, die bis in den Spinnzwickel 3 reicht.In the exemplary embodiment according to FIG. 1, the friction roller 1 from FIG. 1 which rotates into the spinning gusset 3 and is designed as a suction roller is retained. However, the second friction roller 2 ', which forms the spinning gusset 3 with the friction roller 1, is not perforated and is not vacuumed. The collecting groove 4 is formed by the outer surface 10 of the friction roller 1 and an endless belt 8. The surface of the endless belt 8 forms a moving guide surface 80 which extends into the spider gusset 3.

Das endlose Band 8 ist über Umlenkrollen 81, 82 und 83 geführt und wird durch mindestens eine Andrückrolle 84 gegen die Mantelfläche 10 der Friktionswalze 1 gedrückt, so daß die Führungsfläche 80 am Grund der Sammelrille 4 auf der Mantelfläche 10 aufliegt.The endless belt 8 is guided over deflection rollers 81, 82 and 83 and is pressed by at least one pressure roller 84 against the outer surface 10 of the friction roller 1, so that the guide surface 80 rests on the outer surface 10 at the bottom of the collecting groove 4.

Der Anlagedruck der Andrückrotte 84 wird durch eine Feder verstärkt, so daß das endlose Band 8 sicher von der Friktionswalze 1 angetrieben wird, wobei die Oberflächengeschwindigkeit der Führungswalze 80 in der Sammelrille 4 mit der Oberflächengeschwindigkeit der Friktionswalze 1 gleichgerichtet ist.The contact pressure of the pressing rott 84 is increased by a spring, so that the endless belt 8 is safely driven by the friction roller 1, the surface speed of the guide roller 80 in the collecting groove 4 being aligned with the surface speed of the friction roller 1.

Die Funktion und Wirkung dieser Vorrichtung ist die gleiche wie die der Vorrichtung gemäß Fig. 1 und 2.The function and effect of this device is the same as that of the device according to FIGS. 1 and 2.

Claims (23)

1. An open-end spinning device comprising two friction rolls driven in the same direction and forming a spinning nip, at least the friction roll which rotates into the nip being constructed as a suction roll, and fibre material fed to its outer surface being conveyed into the nip, where the fibres are twisted into a thread, characterised in that a collecting groove (4) for the supplied fibre material is provided at a distance from the spinning nip (3) and is formed by the outer surface (10) of the friction roll (1) rotating into the nip and a moving guide surface (50 ; 80) whose surface speed in the collecting groove (4) corresponds to the surface speed of the suction roll (1).
2. A device according to claim 1, characterised in that the collecting groove (4) is formed by a roll (5) closely adjacent the friction roll (1).
3. A device according to claim 1 or 2, characterised in that the guide surface (50 ; 80) rests on the base of the collecting groove (4) on the outer surface (10) of the friction roll (1).
4. A device according to claim 1, characterised in that the guide surface (80) follows the surface of the friction roll (1) up to the nip (3).
5. A device according to claim 4, characterised in that the guide surface (80) is the surface of an endless belt (8).
6. A device according to any of claims 1 to 5, characterised in that the guide surface (50 ; 80) is pressed against the outer surface (10) of the friction roll (1).
7. A device according to any of claims 1 to 6, characterised in that the moving guide surface (50) is followed by a stationary guide surface (60).
8. A device according to claim 7, characterised in that the stationary guide surface (60) extends into the nip (3).
9. A device according to claim 7 or 8, characterised in that the stationary guide surface (60) is disposed at a distance from the moving guide surface (50).
10. A device according to any of claims 7 to 9, characterised in that the stationary guide surface (60) has bores (61) leading to atmosphere.
11. A device according to any of claims 7 to 10, characterised in that the edge (62) of the stationary guide surface (60) facing the moving guide surface (50) is rounded.
12. A device according to any of claims 7 to 11, characterised in that the stationary guide surface (60) is disposed at a distance from the friction roll (1
13. A device according to any of claims 1 to 12, characterised in that fibres are fed to the collecting groove (4) in the longitudinal direction thereof.
14. A device according to any of claims 1 to 13, characterised in that the friction roll (1) has a negative-pressure region (I, II) which, as considered in the direction of rotation, begins in front of the collecting groove (4) and extends into the nip (3).
15. A device according to claim 14, characterised in that the negative-pressure region of the friction roll (1) is divided in the peripheral direction into at least two portions (I, II) having different suction effects.
16. A device more particularly according to claim 15, characterised in that at least one of the friction rolls (1 ; 2) has a portion (I) at higher negative pressure in the nip (3) in the region of the yarn-forming zone.
17. A device according to claim 16, characterised in that the friction roll (1) rotating into the nip has a portion (I) at higher negative pressure.
18. A device according to claim 16 or 17, characterised in that the portion (I) is between 4 and 8 mm wide.
19. A device according to claim 16 or 17, characterised in that portion (I) is 6 mm wide.
20. A device according to claims 16 to 19, characterised in that the middle of portion (I) lies in the plane (A) joining the axes of the friction rolls (1 ; 2).
21. A device according to claims 16 to 19, characterised in that the middle of the portion (I) lies peripherally at a distance from the plane (A) joining the axes of the friction rollers (1 ; 2) on the side remote from the nip (3).
22. A device according to claims 16 to 21, characterised in that, in the case of the friction roll (1) rotating into the nip (3), the portion (I) is followed by a lower negative-pressure portion (II) for conveying the fibres into the yarn-forming zone.
23. A device according to claims 16 to 19, characterised in that the portion (I) extends about 1 mm beyond the plane (A) joining the axes of the friction rolls (1 ; 2) towards the side remote from the nip (3).
EP85905770A 1984-11-13 1985-11-11 Open-end spinning device Expired EP0227688B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3441492 1984-11-13
DE19843441492 DE3441492A1 (en) 1984-11-13 1984-11-13 OPEN-END SPIDER

Publications (2)

Publication Number Publication Date
EP0227688A1 EP0227688A1 (en) 1987-07-08
EP0227688B1 true EP0227688B1 (en) 1989-03-15

Family

ID=6250204

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85905770A Expired EP0227688B1 (en) 1984-11-13 1985-11-11 Open-end spinning device

Country Status (6)

Country Link
US (1) US4697411A (en)
EP (1) EP0227688B1 (en)
CN (1) CN1004151B (en)
DE (2) DE3441492A1 (en)
IN (1) IN166602B (en)
WO (1) WO1986002954A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391889B (en) * 1986-06-12 1990-12-10 Fehrer Ernst Device for the production of a yarn
AT391890B (en) * 1986-06-19 1990-12-10 Fehrer Ernst Apparatus for the production of a yarn
DE3832110A1 (en) * 1988-09-21 1990-03-29 Rieter Ag Maschf FRICTION SPIDER DEVICE
DE3927739A1 (en) * 1989-08-23 1991-02-28 Fritz Stahlecker METHOD AND DEVICE FOR WRAPPING SPIN
DE19601038A1 (en) * 1996-01-13 1997-07-17 Fritz Stahlecker OE-spinning process giving good twist and discharge speed control
DE19601958A1 (en) * 1996-01-20 1997-07-24 Fritz Stahlecker Fibre feed for open=end friction spinner

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3132465A (en) * 1963-02-04 1964-05-12 Deering Milliken Res Corp Textile processing arrangement and method for spinning fibers into yarn
GB1240470A (en) * 1967-08-15 1971-07-28 Cotton Silk & Man Made Fibres Yarns and like fibre assemblies
DE1902111A1 (en) * 1968-01-16 1969-09-04 Cotton Silk & Man Made Fibres Method and device for the production of threads
FR2383253A1 (en) * 1977-03-09 1978-10-06 Vyzk Ustav Bavlnarsky FRICTIONAL YARN SPINNING METHOD AND DEVICE FOLLOWING THE OPEN-END PRINCIPLE
SE413517B (en) * 1978-01-10 1980-06-02 Peo Teknokonsult Ab SET AND DEVICE FOR PREPARING YARN
US4387487A (en) * 1979-10-16 1983-06-14 Murata Kikai Kabushiki Kaisha High draft apparatus in spinning machine
DE3300636A1 (en) * 1983-01-11 1984-07-12 Fritz 7347 Bad Überkingen Stahlecker Open-end friction-spinning device
DE3308249A1 (en) * 1983-03-09 1984-09-13 Fritz 7347 Bad Überkingen Stahlecker OE FRICTION SPIDER
DE3308250A1 (en) * 1983-03-09 1984-09-13 Stahlecker, Fritz, 7347 Bad Überkingen OE FRICTION SPIDER
FR2545108B1 (en) * 1983-04-29 1986-04-04 Juillard Yves SPINNING PROCESS AND DEVICE FOR CARRYING OUT SAID METHOD
DE3330414A1 (en) * 1983-08-23 1985-03-14 Karl-Josef Dipl.-Ing. 4156 Willich Brockmanns METHOD AND DEVICE FOR PREPARING THE SPIN FIBERS SUPPLIED TO A FRICTION SPINDING MACHINE
AT377017B (en) * 1983-08-30 1985-01-25 Fehrer Ernst DEVICE FOR PRODUCING A YARN
IN164144B (en) * 1984-05-18 1989-01-21 Rieter Ag Maschf
US4573312A (en) * 1984-08-23 1986-03-04 W. Schlafhorst & Co. Friction spinning apparatus

Also Published As

Publication number Publication date
WO1986002954A1 (en) 1986-05-22
DE3568803D1 (en) 1989-04-20
EP0227688A1 (en) 1987-07-08
US4697411A (en) 1987-10-06
DE3441492A1 (en) 1986-05-22
DE3441492C2 (en) 1987-11-12
IN166602B (en) 1990-06-09
CN85108755A (en) 1986-06-10
CN1004151B (en) 1989-05-10

Similar Documents

Publication Publication Date Title
DE2449583C3 (en) Open-end spinning device
DE4122216A1 (en) SPIDER
DE19738382B4 (en) off nozzle
EP0990719B1 (en) Spinning device
EP0227688B1 (en) Open-end spinning device
CH679491A5 (en)
EP1685283B1 (en) Fibre guide channel
EP0261330B1 (en) Apparatus to compress and to automatically introduce a textile fibre sheet to a conveying slot
DE3320768A1 (en) DEVICE FOR OE-FRICTION SPINNING
DE19926492A1 (en) Spinning device
DE3300636A1 (en) Open-end friction-spinning device
DE3318924A1 (en) Open-end friction spinning device
EP0208114B1 (en) Method and apparatus for open-end friction spinning
DE3521756C2 (en)
DE3135270A1 (en) WINDING YARN SPINNING UNIT
EP0236324B1 (en) Open-end spinning process and device for its implementation
CH636384A5 (en) Open-end spinning apparatus
CH635142A5 (en) METHOD AND DEVICE FOR PRODUCING A WINDING YARN.
CH662134A5 (en) SPIDER.
DE4004045A1 (en) DEVICE FOR PNEUMATIC SPIRAL SPINNING
EP0235134B1 (en) Open-end spinning device
DE3402368A1 (en) Open-end friction-spinning device
AT388188B (en) Apparatus for the production of a yarn
AT381733B (en) DEVICE FOR PRODUCING A YARN
AT385781B (en) DEVICE FOR PRODUCING A YARN

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19860802

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI

17Q First examination report despatched

Effective date: 19880722

ITF It: translation for a ep patent filed

Owner name: ING. ZINI MARANESI & C. S.R.L.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI

REF Corresponds to:

Ref document number: 3568803

Country of ref document: DE

Date of ref document: 19890420

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: WILHELM STAHLECKER GMBH

Effective date: 19891213

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19900920

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19901024

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19901109

Year of fee payment: 6

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19901212

Year of fee payment: 6

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

27W Patent revoked

Effective date: 19910427

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state