EP0170877B1 - Rotor pour métier à filer à fibres libérées et son procédé de fabrication - Google Patents

Rotor pour métier à filer à fibres libérées et son procédé de fabrication Download PDF

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Publication number
EP0170877B1
EP0170877B1 EP19850108169 EP85108169A EP0170877B1 EP 0170877 B1 EP0170877 B1 EP 0170877B1 EP 19850108169 EP19850108169 EP 19850108169 EP 85108169 A EP85108169 A EP 85108169A EP 0170877 B1 EP0170877 B1 EP 0170877B1
Authority
EP
European Patent Office
Prior art keywords
rotor
open
end spinning
collecting groove
parts
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
EP19850108169
Other languages
German (de)
English (en)
Other versions
EP0170877A1 (fr
Inventor
Hans Dipl.-Ing. Landwehrkamp
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
Application filed by Schubert und Salzer Maschinenfabrik AG filed Critical Schubert und Salzer Maschinenfabrik AG
Publication of EP0170877A1 publication Critical patent/EP0170877A1/fr
Application granted granted Critical
Publication of EP0170877B1 publication Critical patent/EP0170877B1/fr
Expired legal-status Critical Current

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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
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D01H4/10—Rotors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/048—Welding with other step
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49879—Spaced wall tube or receptacle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49893—Peripheral joining of opposed mirror image parts to form a hollow body

Definitions

  • the present invention relates to an open-end spinning rotor with a fiber collecting groove, which consists of two interconnected rotor parts, and a method for its production.
  • Open-end spinning rotors are usually made in one piece. However, it is also known for various reasons to manufacture multi-part open-end spinning rotors. In this way, even complicated rotor shapes can be manufactured more easily and economically than is the case with one-piece open-end spinning rotors.
  • it is divided, for example, in the area of the fiber collecting groove (CH-PS 458.216 and DE-OS 2.103.171). The two rotor parts can be removed from each other, so that fibers and yarn residues between the two rotor parts can be sucked off radially.
  • the production of such multi-part spinning rotors should generally avoid that spinning rotors have to be rotated from the full (DE-OS 2.058.340), or should be simple parts can also be manufactured if the open-end spinning rotor itself has to generate the required operating vacuum (DE-OS 2.058.340 and DE-AS 2.159.248).
  • the sliding wall and the fiber collecting groove are provided in a first rotor part and the fan on another rotor part.
  • the two rotor parts are connected to one another via connecting bolts or directly in a press fit.
  • the parting line between the rotor parts opens into the fiber collecting groove and is at least partially designed as a weld seam.
  • the rotor parts are manufactured and processed completely independently of each other before the connection. Since the parting line opens into the fiber collecting groove, this fiber collecting groove is easily accessible before connecting. This leads to great universality and flexibility in the manufacture of open-end spinning rotors and even allows the formation of extreme forms of the fiber collecting groove, e.g. undercut, extremely deep or very acute-angled fiber collecting grooves.
  • the connection of the two rotor parts by means of a weld seam ensures a safe and wear-resistant connection between the two rotor parts. If necessary, the rotor parts will be held in mutual contact under prestress. Loosening of such a connection between the two rotor parts is reliably avoided, thereby also preventing fibers and dirt from becoming jammed in the parting line.
  • the parting line can take a variety of forms, e.g. the shape of a cylinder or cone jacket, but a parting line which opens radially into the weld seam is particularly advantageous from the point of view of production and also for most applications.
  • each of the two rotor parts has a flange, the parting line being located between these flanges.
  • the spinning rotor can be made very thin-walled to achieve the lowest possible power consumption, since the flange ensures good dimensional stability of the spinning rotor even at high speeds.
  • the wall thickness of the flange of the rotor part forming the rotor base is greater than the wall thickness of the rotor part receiving the sliding wall.
  • the flange with the larger cross-section also fulfills the task that material can be milled off for balancing without weakening the cross-section of the actual spinning rotor and thereby reducing its dimensional stability.
  • connection of the two rotor parts with the help of a weld seam also ensures in the long term that the parting line remains so narrow that no fibers and no dirt can get stuck here.
  • the parting line is delimited by surfaces of the flanges which are non-parallel to one another in the unconnected state and whose edges facing the fiber collecting groove in the connected state by the weld seam below Bias are held in mutual contact.
  • the fiber-collecting groove is designed as an angular annular groove which is formed by embossing at least one of the two rotor parts. By embossing, the surface is compressed and its wear resistance is increased without changing the surface structure.
  • At least part of it can be formed by an insert ring which is clamped in connection to the sliding wall between the two rotor parts and delimits the separating joint radially inwards.
  • an insert ring has the advantage that it can consist of a material that can be selected completely independently of the material of the rest of the spinning rotor.
  • the insert ring is preferably made of a ceramic material.
  • Annular insert rings are already known which form at least part of the fiber collecting groove (DE-Gm 7.622.639 and 7.622.656).
  • the insert ring of these known devices has to extend to the open end of the spinning rotor, which makes the spinning rotor very heavy in weight and thus also consumes a lot of energy during operation.
  • the present invention makes it possible to restrict the insert ring only to the area of the fiber collecting groove, the insert ring then expediently made of a material which differs from the remaining area of the fiber collecting surface, namely the sliding wall of the spinning rotor, e.g. Ceramics.
  • the insert ring can perform different tasks and can also be designed differently. If this insert ring is only to serve the task of ensuring the depth of the fiber collecting groove in the long run, the two rotor parts advantageously have aligned coaxial ring grooves for receiving the insert ring.
  • the insert ring forming at least part of the fiber collecting groove is preferably profiled on its inner circumference. In this way, the insert ring not only forms the bottom of the fiber collecting groove, but also its side walls, which increases the dimensional stability of the fiber collecting groove and thus ensures the spinning properties over a long period of time.
  • the insert ring can consist of two partial rings which are in mutual contact in the area of their largest inner diameter.
  • the open-end spinning rotor is preferably produced from sheet metal by plastic shaping.
  • the insert ring likewise consists of profiled sheet metal, which is held in abutment against the rotor parts by the connected rotor parts under pre-tension.
  • the invention provides that the two rotor parts are connected to one another by welding, the rotor parts being arranged and rotated past the welding point in such a way that the weld seam forms on the outside of the open-end spinning rotor and not as far as in the fiber collecting groove protrudes.
  • a fiber collecting groove of any shape can be produced in a simple manner without the shape of the fiber collecting groove being impaired during the assembly of the rotor parts. As a result, there are no adverse effects on the fibers even when spinning.
  • the two rotor parts are advantageously pressed against one another during the welding process.
  • Particularly light-weight open-end spinning rotors can be achieved according to the invention in that at least the rotor part receiving the sliding wall for the fibers is produced by non-cutting shaping, the fiber collecting groove being shaped by embossing.
  • the two rotor parts are provided with recesses in the area of their later fiber collecting groove, into which an insert ring is inserted when the two rotor parts are joined, which insert ring is welded in this position is secured.
  • the open-end spinning rotor according to the invention can be produced in a simple manner and with simple means and, because of the versatile modifications of its fiber collecting surface, enables universal use. Even the most extreme shapes can be produced without any time-consuming measures.
  • the open-end spinning rotor is dimensionally stable and wear-resistant despite the low power consumption.
  • the open-end spinning rotor shown in FIG. 1 consists of two interconnected rotor parts 1 and 2, which include a fiber collecting groove 3 between them.
  • the rotor part 1 has a sliding wall 11 which widens from the open rotor edge 10 to the fiber collecting groove 3.
  • the rotor part 2 forms the rotor base 24 and has a cone-shaped inner contour. It has a central bore 20 with which it is fastened on a rotor shaft 4.
  • the spinning rotor has a wedge-shaped recess on the outside of the rotor, which has been achieved by appropriate shaping of one or both rotor parts 1 and 2. In this recess there is a weld seam 5 with which the two rotor parts 1 and 2 are connected to one another.
  • the rotor parts 1 and 2 are produced from bar material by machining. Not only are they brought into their final shape, but they are also given the required surface by polishing, coating, etc., as is also known from one-piece open-end spinning rotors.
  • the finished rotor parts 1 and 2 are brought into mutual abutment with their larger diameters and connected to one another with the help of the weld seam 5 mentioned.
  • the welded connection created by inert gas welding, induction welding, etc. ensures that the parting line does not get larger, so that unchanged conditions are maintained.
  • the two rotor parts 1 and 2 which are connected to one another by welding, are arranged to the welding point during welding and rotated past the welding point in such a way that the welding seam 5 is formed only on the outside of the open-end spinning rotor.
  • the weld seam 5 therefore does not extend to the fiber collecting groove 3 and can therefore also have no adverse effects on the fibers deposited in the fiber collecting groove 3 later in the spinning operation.
  • the orientation of the parting line 8 between the rotor parts 1 and 2 is not of crucial importance.
  • the weld seam 5 and the adjoining joint 8 are essentially on a radial plane intersecting the spinning rotor, according to FIG. 2 an annular shoulder 21 is provided in the rotor part 2, which is surmounted by an annular projection 22.
  • the rotor part projects with its larger diameter end up to the shoulder 21 of the rotor part 2. Since the rotor part 1 on the outside has a conicity corresponding to the taper of the sliding wall 11, a wedge-shaped parting line 8 is formed between this outer wall 12 and the annular projection 22 essentially has the shape of a cylindrical surface and is practically completely filled by the weld seam 5. With such a design of the spinning rotor, the ring projection 22 offers particularly good resistance to deformation at high rotor speeds.
  • the rotor parts 1 and 2 have radial flanges 13 and 23, via which the rotor parts 1 and 2 are connected. Both flanges 13 and 23 have a slight taper in such a way that when the edges forming the fiber collecting groove 3 lie one on top of the other, the surfaces to be connected do not abut one another, but instead form an annular gap 50 which widens conically outwards (see dashed representation in FIG. 3). While the rotor parts 1 and 2 are connected by welding, these surfaces are then pressed against one another (arrows 51) until the two rotor parts 1 and 2 are connected to one another by the weld seam 5.
  • the two flanges 13 and 23 are of different thicknesses, the flange 23 of the rotor part 2, which forms the bottom 24 of the spinning rotor, having a greater wall thickness b than the rotor part 1 with the sliding wall 11 (wall thickness a) .
  • the rotor part 2 gives the finished open-end spinning rotor high dimensional stability even at high speeds.
  • the finished spinning rotor can be balanced in a simple manner by milling material from the flange 23 without this happening in the area of the joint 8 filled by the weld seam 5, since the flange 23 is so strong that this milling on its the joint 8 opposite side can happen.
  • Such a balancing milling point 52 is indicated by dashed lines in FIG.
  • FIG. 5 shows, for example, a spinning rotor, the rotor parts 1 and 2 of which have been produced from sheet metal by plastic shaping and which include an acute-angled fiber collecting groove 3 between them.
  • the fiber collecting groove 3 can include such an acute angle as could not be produced with conventional pressing and rolling tools.
  • annular groove 30 has been formed in the rotor part 2 by embossing, which forms the fiber collecting groove 3 after the inseparable joining of the two rotor parts 1 and 2.
  • an angular annular groove 31 or 30 has been formed both in the rotor part 1 and in the rotor part 2, which together form the fiber collecting groove 3.
  • the fiber collecting groove 3 of open-end spinning rotors is usually subjected to particularly high wear.
  • an insert ring 6 is provided according to FIGS. 6 to 8, which forms at least part of the fiber collecting groove 3.
  • this insert ring 6 is designed as a ceramic part.
  • a coaxial annular groove 7 or 70 is provided in each of the two rotor parts 1 and 2, both of which have the same diameter.
  • the geometry of the rotor parts 1 and 2 and of the insert ring 6 are selected such that the insert ring 6 radially delimits the fiber collecting groove 3, while the side walls of the fiber collecting groove 3 are formed by the rotor parts 1 and 2. These side walls can in turn have different shapes and inclinations.
  • FIG. 7 shows a modification of the open-end spinning rotor shown in FIG. 6.
  • the insert ring 6 is arranged in recesses in the rotor parts 1 and 2, which are open to the inside of the rotor, instead of in ring grooves 7 and 70, and forms the entire fiber collecting groove 3.
  • the insert ring 6 is so that the fiber collecting groove 3 can have any shape divided into two partial rings 60 and 61, both of which are profiled in the desired manner.
  • the partial rings 60 and 61 are held in mutual contact in the region of their largest inner diameter and together form the fiber collecting groove 3.
  • the insert ring 6 has received its shape before insertion between the rotor parts 1 and 2 forming the open-end spinning rotor.
  • This profiling of the inner circumferential surface of the insert ring 6 in accordance with the desired cross section of the fiber collecting groove 3 takes place in different ways depending on the material type and thickness.
  • FIG. 8 shows a sheet metal spinning rotor which receives an insert ring 6 which is also made of sheet metal.
  • This insert ring 6 consists of wear-resistant spring steel or the like and is brought into the desired shape by rolling.
  • the final shape of the fiber collecting groove 3 is only achieved by joining and connecting the two rotor parts 1 and 2, so that the ends of this insert ring 6 fit tightly against the inner walls of the rotor parts 1 and 2 due to the preload achieved in this way and so that fibers and dirt particles cannot get stuck.
  • This enables particularly acute-angled shapes of the fiber collecting groove 3, since the final shape is obtained only when the two rotor parts 1 and 2 are connected by means of the weld seam 5.
  • such an insert ring 6 made of sheet metal can also be used in rotor parts 1 and 2 designed as turned parts.
  • the open-end spinning rotor can undergo numerous other modifications which also fall within the scope of the present invention. This includes the exchange of characteristics with one another or their replacement by equivalents.
  • the rotor part 1 can also consist of sheet metal and the rotor part 2 can be produced as a turned steel part.
  • the open rotor edge 10 can also receive a suitable reinforcement 14 (FIG. 4).
  • the two rotor parts 1 and 2 can also consist of different materials if the weldability is not impaired thereby.

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

Claims (16)

1. Rotor de filature à fibres libérées, comportant une gorge collectrice de fibres et composé de deux éléments reliés l'un à l'autre, rotor caractérisé en ce que la ligne de joint (8) entre les éléments (1, 2) de ce rotor débouche dans la gorge (3) collectrice de fibres et est comblée au moins partiellement par un cordon (5) de soudure.
2. Rotor de filature à fibres libérées selon la revendication 1, caractérisé en ce que la ligne de joint (8) débouche radialement dans le cordon (5) de soudure.
3. Rotor de filature à fibres libérées selon la revendication 2, caractérisé en ce que les deux éléments (1, 2) de rotor comportent chacun une collerette radiale (13, 14) respective, la ligne de joint (8) se trouvant entre elles.
4. Rotor de filature à fibres libérées selon la revendication 3, dont l'un des éléments comporte une surface de glissement de fibres et dont l'autre élément forme un fond de rotor, rotor caractérisé en ce que l'épaisseur (b) de la collerette (23) de l'élément (2) qui forme le fond (24) du rotor est supérieure à l'épaisseur (a) de la collerette (13) de l'élément (1) qui comporte la surface (11) de glissement.
5. Rotor de filature à fibres libérées selon la revendication 3 ou 4, caractérisé en ce que la ligne de joint (8) est délimitée par des surfaces de collerettes (13, 23) qui ne sont pas parallèles quand les éléments du rotor ne sont pas reliés et dont les bords, tournés vers la gorge (3) collectrice de fibres, sont maintenus face à face sous précontrainte par le cordon (5) de soudure quand ces éléments sont reliés.
6. Rotor de filature à fibres libérées selon l'une ou plusieurs des revendications 1 à 5, caractérisé en ce que la gorge (3) collectrice de fibres a la conformation d'une gorge annulaire (30, 31) à section anguleuse, qui est formée par matriçage d'au moins l'un des deux éléments (1, 2) de rotor.
7. Rotor de filature à fibres libérées selon l'une ou plusieurs des revendications 1 à 6, caractérisé en ce qu'une partie au moins de la gorge (3) collectrice de fibres est formée par une bague (6) rapportée faisant suite à la surface (11 ) de glissement, qui est retenue entre les deux éléments (1, 2) de rotor et qui limite radialement vers l'intérieur la ligne de joint (8).
8. Rotor de filature à fibres libérées selon la revendication 7, caractérisé en ce que la bague (6) rapportée est en céramique.
9. Rotor de filature à fibres libérées selon la revendication 7 ou 8, caractérisée en ce que les deux éléments (1, 2) de rotor comportent des gorges annulaires (7, 70) coaxiales, alignées, destinées à loger la bague (6) rapportée.
10. Rotor de filature à fibres libérées selon l'une ou plusieurs des revendications 7 à 9, caractérisé en ce que la bague (6) rapportée, formant une partie au moins de la gorge (3) collectrice de fibres, est profilée sur son périmètre intérieur.
11. Rotor de filature à fibres libérées selon la revendication 10, caractérisé en ce que la bague (6) rapportée est composée de deux bagues partielles (60, 61) dont les surfaces ayant le plus grand diamètre intérieur se font vis à vis.
12. Rotor de filature à fibres libérées selon la revendication 10, caractérisé en ce que la bague (6) rapportée est en tôle profilée que les éléments (1, 2) de rotor mutuellement reliés appliquent avec précontrainte contre eux.
13. Procédé de fabrication d'un rotor de filature à fibres libérées selon l'une ou plusieurs des revendications 1 à 12, caractérisé en ce que les deux éléments de rotor sont reliés par soudage, ces éléments étant disposés par rapport au poste de soudage et tournant devant lui de façon que le cordon de soudure se forme du côté extérieur du rotor et ne pénètre pas jusqu'à la gorge collectrice de fibres.
14. Procédé selon la revendication 13, caractérisé en ce que les deux éléments de rotor sont pressés l'un contre l'autre pendant le soudage.
15. Procédé selon la revendication 13 ou 14, caractérisé en ce qu'au moins l'élément de rotor qui comporte la surface de glissement de fibres est façonné par déformation sans usinage à l'outil de coupe, la gorge collectrice de fibres étant formée par matriçage.
16. Procédé selon l'une ou plusieurs des revendications 13 à 15, caractérisé en ce que les deux éléments de rotor comportent, à l'emplacement de la future gorge collectrice de fibres, des évidements dans lesquels une bague rapportée est logée quand ces éléments sont assemblés, cette bague étant fixée en cet endroit par le soudage des deux éléments de rotor.
EP19850108169 1984-08-08 1985-07-02 Rotor pour métier à filer à fibres libérées et son procédé de fabrication Expired EP0170877B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3429132 1984-08-08
DE3429132 1984-08-08

Publications (2)

Publication Number Publication Date
EP0170877A1 EP0170877A1 (fr) 1986-02-12
EP0170877B1 true EP0170877B1 (fr) 1987-10-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850108169 Expired EP0170877B1 (fr) 1984-08-08 1985-07-02 Rotor pour métier à filer à fibres libérées et son procédé de fabrication

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US (1) US4663930A (fr)
EP (1) EP0170877B1 (fr)
DE (1) DE3560837D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3728951A1 (de) * 1987-08-29 1989-03-09 Kolbenschmidt Ag Gerollte buchse fuer gleitlager
DE4344012A1 (de) * 1993-12-23 1995-06-29 Rieter Ingolstadt Spinnerei Offenend-Spinnrotor
DE19848118A1 (de) * 1998-10-20 2000-04-27 Rieter Ingolstadt Spinnerei Spinnrotor für eine Offenend-Spinnvorrichtung
DE19910277B4 (de) 1999-03-09 2010-11-04 Oerlikon Textile Gmbh & Co. Kg Spinnrotor für Offenend-Spinnmaschinen
DE10302178A1 (de) * 2003-01-22 2004-07-29 Rieter Ingolstadt Spinnereimaschinenbau Ag Spinnrotor für das OE-Spinnen
DE102004062794A1 (de) * 2004-12-20 2006-06-29 Spindelfabrik Süssen Schurr Stahlecker & Grill GmbH Rotorteller für eine Offenend-Spinnvorrichtung
DE102015108797A1 (de) * 2015-06-03 2016-12-08 Maschinenfabrik Rieter Ag Offenendspinnrotor mit einer Rotortasse mit einer Fasersammelrille, einem Rotorboden und eine Faserrutschwand und Offenendspinnvorrichtung mit einem Offenendspinnrotor

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339360A (en) * 1967-09-05 Ringless spinning apparatus with easily cleanable spinning chamber
US1586691A (en) * 1923-02-06 1926-06-01 Jr Thomas E Murray Welding
DE1560307C3 (de) * 1967-03-09 1979-03-08 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Oifen-End-Spinnvorrichtung
GB1383194A (en) * 1970-10-08 1975-02-05 Platt International Ltd Open-end spinning apparatus
GB1591192A (en) * 1977-02-25 1981-06-17 Platt Saco Lowell Ltd Open-end spinning apparatus
DE2750456B1 (de) * 1977-11-11 1979-05-03 Dornier System Gmbh Spinnrotor fuer OE-Rotorspinnmaschine
DE2939326C2 (de) * 1979-09-28 1982-05-19 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Offenend-Spinnrotor
DE2939325C2 (de) * 1979-09-28 1982-05-06 Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt Offenend-Spinnrotor
GB2104111B (en) * 1981-08-14 1986-04-23 Reiners Verwaltungs Gmbh Spinning rotor for an open-end spinning machine and method for its production
US4590652A (en) * 1983-10-14 1986-05-27 Apx Group Inc. Method for fabricating an air gap pipe
US4561476A (en) * 1984-10-11 1985-12-31 The Garrett Corporation Toroidal pressure vessel

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DE3560837D1 (en) 1987-12-03
US4663930A (en) 1987-05-12
EP0170877A1 (fr) 1986-02-12

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