EP3415670B1 - Rotor socket for an open-end spinning rotor and method for manufacturing a rotor socket for an open-end spinning rotor - Google Patents

Rotor socket for an open-end spinning rotor and method for manufacturing a rotor socket for an open-end spinning rotor Download PDF

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Publication number
EP3415670B1
EP3415670B1 EP18176280.8A EP18176280A EP3415670B1 EP 3415670 B1 EP3415670 B1 EP 3415670B1 EP 18176280 A EP18176280 A EP 18176280A EP 3415670 B1 EP3415670 B1 EP 3415670B1
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EP
European Patent Office
Prior art keywords
rotor
separating structures
rotor cup
cup
separating
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EP18176280.8A
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German (de)
French (fr)
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EP3415670A1 (en
Inventor
Markus Kübler
Bernd Loos
Andreas Frank
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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
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/02—Spinning or twisting arrangements for imparting permanent twist
    • D01H7/74—Cup or like arrangements
    • D01H7/78—Constructions of cups, e.g. spinning boxes
    • 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
    • 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
    • D01H4/48—Piecing arrangements; Control therefor
    • D01H4/50—Piecing arrangements; Control therefor for rotor spinning
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H2700/00—Spinning or twisting machines; Drafting devices
    • D01H2700/01—Preparatory spinning machines

Definitions

  • the present invention relates to a method for producing a rotor cup for an open-end spinning rotor, in which a front edge of the rotor cup is provided with separating structures for interrupting and preparing a yarn end for piecing.
  • the invention also relates to a rotor cup for an open-end spinning rotor with an inner rotor wall, an outer rotor wall, a rotor base and an opening opposite the rotor base, with a front edge of the rotor cup being provided with separating structures for interrupting and preparing a yarn end for piecing.
  • the DE 34 29 511 A1 describes, for example, a method for producing a spinning rotor in which the fiber sliding surface and/or the fiber collecting groove is eroded in a point-like manner until it is provided with a large number of erosion craters. This is intended to achieve good orientation of the spinning fibers during spinning and to avoid an uneven accumulation of dirt in the fiber groove. This is intended to improve the spinning result.
  • the DE 196 51 419 A1 proposed adding coarser profiling to a fiber collection groove that contains fine structuring. This combination is said to result in higher yarn strength and a more even yarn.
  • the DE 10 2012 110 926 A1 describes a method for preparing a yarn end for piecing, in which the yarn is not prepared for piecing by a separate preparation device outside the spinning device, but inside the spinning device by the edge of the spinning rotor.
  • the yarn is sucked into the vacuum channel via a small draw-off tube and a draw-off nozzle, via which the open-end spinning device is supplied with negative pressure, and is held therein.
  • the yarn runs over the open edge of the spinning rotor and is interrupted by it as soon as the spinning rotor starts to rotate.
  • the edge of the spinning rotor has separating structures for separating and preparing the yarn end.
  • the edge of the spinning rotor is provided with incisions, which then have the effect of a saw.
  • the incisions are filled with an abrasive, which then also has a sawing or grinding effect.
  • the DE 10 2015 117 204 A1 also shows such a spinning rotor with separation structures for preparing a yarn end for repiecing.
  • the separating structures should not be applied to the spinning rotor by cutting, but rather by knurling.
  • a non-mechanical manufacturing method is understood as meaning a method in which the separating structures are introduced without pressure, ie without the application of forces to the rotor cup during the production of the separating structures.
  • the separating structures can be introduced into the edge of the open-end spinning rotor in a particularly gentle manner, without deforming or even damaging it.
  • the separating structures are applied by a non-mechanical removal method, since the separating structures are thereby firmly connected to the rotor cup or the open edge of the rotor cup.
  • a non-mechanical removal method it is possible to apply the separating structures in the form of microprofiling with a profile depth of less than 100 ⁇ m.
  • the edges of the separating structures can be formed with comparatively sharp edges as a result of the non-mechanical removal or coating. The sharp-edged separation structures can therefore effectively mill and reliably cut the yarn end to be prepared for piecing.
  • a rotor cup for an open-end spinning rotor which has an inner rotor wall and an outer rotor wall, a rotor base and an opening opposite the rotor base, and in which a front edge of the rotor cup is provided with separating structures for interrupting and preparing a yarn end for piecing
  • the separating structures have a surface with a microprofile, ie a profile whose profile depth is less than 100 microns.
  • a microprofile is applied using the non-mechanical methods described.
  • yarn end preparation that is particularly gentle on the yarn and yet effective is possible. It is also particularly advantageous with such a microprofile that the risk of fibers getting caught after the yarn end preparation is reduced.
  • the profile depth of the microprofile is preferably less than 50 ⁇ m and preferably more than 5 ⁇ m.
  • the microprofile is irregular.
  • an irregular microprofile is understood to be a profile whose height or depth, i.e. the distance between high points and low points of the profile, varies in each case or whose high points and/or low points are arranged at unequal distances from one another.
  • the separating structures are designed in the form of depressions. As described above, these can be introduced in a particularly advantageous manner by a non-mechanical removal process. However, it is also possible to form the separating structures in the form of elevations. For this purpose it is possible, for example, to partially provide the open edge of the rotor cup with a coating.
  • the separating structures are to be provided in the form of depressions, it is advantageous if the separating structures are applied by laser ablation.
  • Laser ablation can be used to produce a microprofile with a high level of irregularity or ablation that varies greatly locally, which can be used particularly advantageously with a wide variety of applications. As a result, it is not necessary to have different open-end spinning rotors with different separating structures on hand.
  • the separating structures are applied using an electrochemical removal process. This also makes it possible to produce a technologically favorable microprofile that is suitable for a wide variety of applications.
  • the separating structures are applied in the form of a plurality of depressions which are spaced apart from one another, preferably equidistantly spaced apart from one another. It is also advantageous in the case of the rotor cup if the edge is provided with a plurality of separating structures, in particular depressions, arranged at a distance from one another. By arranging several separating structures next to one another, the severing of the yarn can also be ensured when the spinning rotor is only performing one revolution or even only part of a revolution. This gives the edge of the rotor cup a grinding effect, which, thanks to the micro-profile, nevertheless allows the fibers at the end of the yarn to be opened gently.
  • the rotor cup is produced by turning, the turning of the rotor cup and the application of the separating structures taking place in the same production step.
  • the separating structures by laser removal, it is possible, for example, to fix the laser device to the lathe and direct the laser at the edge of the rotor cup.
  • By rotating the rotor cup further by a specific angle of rotation it is possible in a simple manner to apply a plurality of separating structures to the rotor cup at any spacing.
  • the rotor cup is provided with a coating, in particular with a nickel-diamond coating.
  • a coating in particular with a nickel-diamond coating.
  • the separating structures are only introduced into the coating. The yarn is therefore only in contact with the resistant coating in the area of the separating structures, so that premature wear of the rotor cup can be avoided as a result.
  • the separating structures are distributed over the entire circumference of the rotor cup.
  • the yarn end can be severed and prepared independently of a position of the spinning rotor or independently of an angle of rotation of the spinning rotor, which it executes during the preparation of the yarn ends.
  • a particularly uniform and reproducible yarn end preparation can be achieved in this way.
  • the separating structures have a width of less than 0.5 mm, preferably less than 0.3 mm and particularly preferably less than 0.2 mm.
  • the separating structures have a depth or a height of less than 100 ⁇ m, preferably less than 70 ⁇ m and in particular preferably have less than 50 microns. This achieves a fine profiling of the surface of the edge of the rotor cup, which ensures good and reliable yarn end preparation and at the same time does not affect the mechanical properties of the rotor cup.
  • the fine separating structures with a width of less than 1 mm and preferably less than 0.3 mm also result in a very fine surface structuring, which does not impair the concentricity of the rotor cup.
  • the separating structures in particular the depressions, have a distance of between 0.2 mm and 1.5 mm, preferably 0.2 mm to 1.0 mm and particularly preferably 0.3 mm to 0.8 mm from one another exhibit. If the separating structures are arranged at such a distance, the result is a favorable rubbing effect. It has been shown that a distance between adjacent separating structures with the stated dimensions is particularly suitable for a wide variety of yarn types and yarn counts. However, it is also possible to influence the grinding effect on the thread by the distance between the separating structures, so that depending on the distance between the separating structures, the open-end spinning rotor is particularly suitable either for finer or for coarser yarns or for certain materials.
  • the separating structures reach into the inner rotor wall and/or into the outer rotor wall.
  • the safety of yarn cutting and yarn preparation can be increased as a result, since cutting and yarn end preparation can still take place if the yarn is guided at an angle over the edge of the open edge of the rotor cup and thus does not sweep over the flat edge directly.
  • FIG 1 shows a schematic sectional view of an open-end spinning device 2 with an open-end spinning rotor 1.
  • the open-end spinning rotor 1 is mounted in the usual way in a rotor housing 3, with the rotor housing 3 being subjected to negative pressure during regular spinning operation via a negative pressure channel 8 and by means of a Cover 4 is closed.
  • the open-end spinning rotor 1 has a rotor shaft 9, by means of which it is mounted in the rotor housing 3, and a rotor cup 10, in which a yarn 5 is also produced in a known manner.
  • the yarn 5 is drawn off during regular spinning operation via a draw-off nozzle 6 mounted in the cover 4 and optionally a draw-off tube 7 and fed to a winding device, not shown here, where it is wound onto a spool.
  • the rotor cup 10 of the open-end spinning rotor 1 also has, in a conventional manner, an inner rotor wall 12 onto which the fibers to be spun are fed, a fiber collecting groove 15 in which the fibers accumulate in the form of a fiber ring and into the end of the yarn already produced 5 are integrated, as well as a rotor base 14, on which the rotor cup 10 is connected to the rotor shaft 9.
  • the rotor cup 10 has an opening 11 into which a projection of the cover 4, which carries the draw-off nozzle 6, protrudes during regular spinning operation, so that the yarn 5 can be drawn off via the draw-off nozzle 6 and the draw-off tube 7.
  • the rotor cup 10 also has an outer rotor wall 13 and a front edge 16 which extends between the outer rotor wall 13 and the inner rotor wall 12 and together with the inner rotor wall 12 delimits the opening 11 .
  • a yarn end 5a must be cut to length and prepared for re-piecing in a defined manner so that it can then be returned to the fiber collection groove 15 of the rotor cup 10 and piecing again.
  • the cutting of the yarn 5 and the preparation of the yarn end 5a for re-tightening takes place at the front edge 16.
  • the yarn end 5 is guided through the discharge tube 7 and the discharge nozzle 6 into the rotor housing 3 and sucked into the vacuum channel 8, where it is drawn through the Effect of the negative pressure is recorded. Again figure 1 removed, the yarn end 5a is guided over the front edge 16 of the rotor cup 10.
  • the edge 16 is for preparing the yarn end 5a with separating structures 17 (see Figures 2-6 ) Mistake.
  • the open-end spinning rotor 1 is rotated during the preparation of the yarn ends, so that the yarn end 5a guided over the edge 16 or resting on the edge 16 is severed and frayed by a sawing or grinding effect of the separating structures 17 .
  • the yarn end 5a can be fed to the already rotating spinning rotor 1, or the yarn end 5a can first be placed on the front edge 16 of the open-end spinning rotor 1 that is still standing and the open-end spinning rotor 1 only then be set in rotation.
  • the separation structures17 can be designed as elevations 22 or depressions 18 and can be introduced into the edge 16 in various ways.
  • figure 2 shows a first embodiment of a rotor cup 10 with separating structures 17, which are not applied over the entire circumference, but only in the present case on two opposite partial areas.
  • a top view of the opening 11 and the front edge 16 of the rotor cup 10 is shown.
  • the rotor base 14 and part of the outer rotor wall 13 can also be seen.
  • a plurality of separating structures 17 are arranged equidistantly from one another.
  • a first number of separating structures 17 is provided in a first partial area of the edge 16 and a second number of separating structures 17 in a second partial area of the edge 16 .
  • Deviating from the representation shown it would of course also be possible to arrange the separating structures 17 at non-uniform distances.
  • figure 3 shows another embodiment of a rotor cup 10, in which the separating structures 17 are also spaced equidistantly from one another, but are distributed over the entire circumference of the rotor cup 10 or the edge 16.
  • the separating structures 17 are also spaced equidistantly from one another, but are distributed over the entire circumference of the rotor cup 10 or the edge 16.
  • FIG 4 shows an enlarged view of a section of the edge 16 of a rotor cup 10, the separating structures 17 arranged next to one another being visible again.
  • the separating structures 17 in this case have a surface with a microprofile 20, which is only indicated in the present case on a separating structure and is explained below with reference to FIG Figures 5 and 6 will be described in more detail.
  • the individual separating structures 17 are again arranged equidistantly at a distance A from one another.
  • the distance A is approximately 0.5 mm in the example shown, with the individual separating structures 17 having a width B of approximately 0.15 mm.
  • Such a comparatively fine arrangement of separating structures 17 has proven to be advantageous for the reliable severing and preparation of a wide variety of yarns.
  • the separating structures 17 are not only attached directly to the flat front edge 16 of the rotor cup 10, but also extend a little further into the outer rotor wall 13 or the inner rotor wall 12. Reliable yarn end preparation is thus also achieved when the yarn end 5a is not guided flat over the edge 16 but only touches it at an angle in the edge regions.
  • figure 5 shows a cross section through a separating structure 17 in a broken representation.
  • the separating structure 17 is designed as a depression 18 and has a surface with a microprofile 20 .
  • a microprofile 20 is understood to mean a profile which has a profile depth PT of less than 100 ⁇ m.
  • the tread depth T is like that figure 5 removed, defined as the distance between the highest and the lowest point of the micro-profile 20 or as the maximum height difference of the surface of the micro-profile 20.
  • the depth T of the separating structure 17 can be seen, which extends from the original surface of the front edge 16 to the deepest point of the microprofile 20 .
  • the width B of the separating structure 17 is again indicated.
  • the microprofile 20 is formed irregularly and has individual peaks which are of different heights and are also arranged at different points in relation to the width B of the separating structure 17 .
  • the individual peaks are also arranged in an irregular sequence in the longitudinal direction of the separating structure 17, as in FIG figure 4 symbolized by the lowest separating structure 17.
  • the separating structure 17 has sharp edges at the edges 23, so that the edges 23 act as cutting edges and the separating structure 17 has a particularly good sawing or milling effect on the yarn.
  • the present rotor cup 10 is also provided with a coating 19 which is applied to the base material 21 of the rotor cup 10 .
  • the separating structures 17 or the microprofile 20 are only introduced into the coating 19 and do not extend into the base material 21 . In this way, it is achieved in a particularly advantageous manner that the wear-reducing effect of the coating 19 is also still present within the separating structure 17 and excessive wear in the area of the separating structure 17 does not occur.
  • the coating 19 is preferably designed as a nickel-diamond coating. Depending on the design of the rotor cup 10, it would of course also be possible to introduce the separating structures 17 directly into the base material 21 of the rotor cup 10. Of course, other coatings or surface treatments of the rotor cup 10 are also possible.
  • FIG 6 finally shows another embodiment of a separating structure 17, which is provided in the form of an elevation 22.
  • the edges 23, of which only one is designated here, are comparatively sharp-edged.
  • a cross section through the separating structure 17 is again shown in a broken representation.
  • Such an increase 22 can be produced, for example, by a partial coating of the edge 16 of the rotor cup 10, in which case a sharp-edged edge 23 can also be produced.
  • the profile depth PT is smaller than the height H of the separating structure 17.
  • the profile depth PT it would also be possible for the profile depth PT to be equal to the height H of the separating structure 17.
  • the separating structure 17 it is also possible for the separating structure 17 to be in the form of a depression 18, but for the microprofile 20 to have a highest point above the surface of the edge 16. In this case, the profile depth PT would be greater than the depth T of the depression. Likewise, it would also be possible in the case of an elevation 22 that a lowest point of the microprofile 20 is nevertheless below the surface of the edge 16, so that the profile depth PT would be greater than the height H of the elevation.

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

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer Rotortasse für einen Offenend-Spinnrotor, bei welchem ein stirnseitiger Rand der Rotortasse mit Trennstrukturen zum Unterbrechen und Vorbereiten eines Garnendes zum Anspinnen versehen wird. Weiterhin betrifft die Erfindung eine Rotortasse für einen Offenend-Spinnrotor mit einer inneren Rotorwand, einer äußeren Rotorwand, einem Rotorboden und einer dem Rotorboden gegenüberliegenden Öffnung, wobei ein stirnseitiger Rand der Rotortasse mit Trennstrukturen zum Unterbrechen und Vorbereiten eines Garnendes zum Anspinnen versehen ist.The present invention relates to a method for producing a rotor cup for an open-end spinning rotor, in which a front edge of the rotor cup is provided with separating structures for interrupting and preparing a yarn end for piecing. The invention also relates to a rotor cup for an open-end spinning rotor with an inner rotor wall, an outer rotor wall, a rotor base and an opening opposite the rotor base, with a front edge of the rotor cup being provided with separating structures for interrupting and preparing a yarn end for piecing.

Zur Herstellung von Offenend-Spinnrotoren sind eine Vielzahl von verschiedenen Verfahren bekannt geworden. Die Spinnrotoren werden dabei häufig durch Drehen hergestellt und mit einer Beschichtung versehen, um sie widerstandsfähiger gegen die abrasive Wirkung der Fasern zu machen.A large number of different methods have become known for the production of open-end spinning rotors. The spinning rotors are often made by turning and coated to make them more resistant to the abrasive effects of the fibers.

Die DE 34 29 511 A1 beschreibt beispielsweise ein Verfahren zur Herstellung eines Spinnrotors, bei dem die Faserrutschfläche und/oder die Fasersammelrille punktförmig erodiert wird, bis sie mit einer Vielzahl von Erosionskratern versehen ist. Hierdurch soll eine gute Orientierung der Spinnfasern beim Spinnen erreicht werden und eine ungleichmäßige Schmutzansammlung in der Faserrille vermieden werden. Das Spinnergebnis soll hierdurch verbessert werden.the DE 34 29 511 A1 describes, for example, a method for producing a spinning rotor in which the fiber sliding surface and/or the fiber collecting groove is eroded in a point-like manner until it is provided with a large number of erosion craters. This is intended to achieve good orientation of the spinning fibers during spinning and to avoid an uneven accumulation of dirt in the fiber groove. This is intended to improve the spinning result.

In ähnlicher Weise schlägt die DE 196 51 419 A1 vor, in eine Fasersammelrille, die feine Strukturierungen enthält, zusätzlich noch gröbere Profilierungen einzubringen. Diese Kombination soll zu einer höheren Festigkeit des Garns und zu einem gleichmäßigeren Garn führen.Similarly, the DE 196 51 419 A1 proposed adding coarser profiling to a fiber collection groove that contains fine structuring. This combination is said to result in higher yarn strength and a more even yarn.

Um nach einer Unterbrechung des Spinnprozesses beispielsweise durch einen Fadenbruch oder auch einen Qualitätsschnitt den Spinnvorgang wieder aufnehmen zu können, ist es erforderlich, das anzuspinnende Garnende definiert abzulängen und zum Wiederanspinnen vorzubereiten. Auch zum Vorbereiten eines Garnendes sind verschiedene Verfahren bekannt geworden. Beispielsweise ist es üblich, das Garnende mittels eines Luftstromes aufzufasern.In order to be able to resume the spinning process after an interruption in the spinning process, for example due to a thread breakage or a quality cut, it is necessary to cut the yarn end to be piecing to a defined length and prepare it for piecing again. Various methods have also become known for preparing a yarn end. For example, it is common to unravel the yarn end by means of an air stream.

Die DE 10 2012 110 926 A1 beschreibt ein Verfahren zur Vorbereitung eines Garnendes zum Anspinnen, bei dem das Garn nicht durch eine gesonderte Präparationseinrichtung außerhalb der Spinnvorrichtung, sondern innerhalb der Spinnvorrichtung durch den Rand des Spinnrotors zum Anspinnen vorbereitet wird. Das Garn wird hierzu über ein Abzugsröhrchen und eine Abzugsdüse in den Unterdruckkanal eingesaugt, über welchen die Offenendspinnvorrichtung mit Unterdruck versorgt wird, und darin gehalten. Das Garn verläuft dabei über den offenen Rand des Spinnrotors und wird von diesem unterbrochen, sobald der Spinnrotor sich zu drehen beginnt. Zum Trennen und Vorbereiten des Garnendes weist der Rand des Spinnrotors Trennstrukturen auf. Zur Herstellung der Trennstrukturen wird der Rand des Spinnrotors mit Einschnitten versehen, welche dann die Wirkung einer Säge zeigen. Nach einer alternativen Ausführung werden die Einschnitte mit einem Schleifmittel ausgefüllt, welches dann ebenfalls eine sägende bzw. schleifende Wirkung hat.the DE 10 2012 110 926 A1 describes a method for preparing a yarn end for piecing, in which the yarn is not prepared for piecing by a separate preparation device outside the spinning device, but inside the spinning device by the edge of the spinning rotor. For this purpose, the yarn is sucked into the vacuum channel via a small draw-off tube and a draw-off nozzle, via which the open-end spinning device is supplied with negative pressure, and is held therein. The yarn runs over the open edge of the spinning rotor and is interrupted by it as soon as the spinning rotor starts to rotate. The edge of the spinning rotor has separating structures for separating and preparing the yarn end. To produce the separating structures, the edge of the spinning rotor is provided with incisions, which then have the effect of a saw. According to an alternative embodiment, the incisions are filled with an abrasive, which then also has a sawing or grinding effect.

Die DE 10 2015 117 204 A1 zeigt ebenfalls einen solchen Spinnrotor mit Trennstrukturen zur Vorbereitung eines Garnendes zum Wiederanspinnen. Dabei sollen die Trennstrukturen nicht durch Einschneiden, sondern durch Rändeln auf den Spinnrotor aufgebracht werden.the DE 10 2015 117 204 A1 also shows such a spinning rotor with separation structures for preparing a yarn end for repiecing. The separating structures should not be applied to the spinning rotor by cutting, but rather by knurling.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zur Herstellung einer Rotortasse vorzuschlagen, dass ein schonendes Einbringen der Trennstrukturen ermöglicht und eine gute Garnendenvorbereitung gewährleistet.It is the object of the present invention to propose a method for producing a rotor cup that allows gentle introduction of the separating structures and ensures good preparation of the yarn ends.

Die Aufgabe wird gelöst mit den Merkmalen der unabhängigen Ansprüche. Bei einem Verfahren zur Herstellung einer Rotortasse für einen Offenend-Spinnrotor, bei welchem ein stirnseitiger Rand der Rotortasse mit Trennstrukturen zum Unterbrechen und Vorbereiten eines Garnendes zum Anspinnen versehen wird, ist vorgesehen, dass die Trennstrukturen durch ein nichtmechanisches Fertigungsverfahren aufgebracht werden. Dabei wird im Rahmen der vorliegenden Erfindung unter einem nichtmechanischen Fertigungsverfahren ein Verfahren verstanden, bei dem die Einbringung der Trennstrukturen drucklos, also ohne das Aufbringen von Kräften auf die Rotortasse während der Herstellung der Trennstrukturen, erfolgt. Mit einem derartigen nichtmechanischen bzw. drucklosen Fertigungsverfahren können die Trennstrukturen in besonders schonender Weise in den Rand des Offenend-Spinnrotors eingebracht werden, ohne diesen zu verformen oder gar zu beschädigen. Aufgrund der sehr hohen Drehzahlen von bis zu 180.000 1/ min, mit welchen heutige Offenend-Spinnrotoren umlaufen, kann es nämlich selbst beim Aufbringen von nur kleinen Betätigungskräften, wie sie beispielsweise beim Einschneiden des Rotorrandes auftreten, zu Verformungen des Rotors und in Folge zu Unwuchten im Betrieb kommen. Dies kann mit dem Aufbringen der Trennstrukturen durch ein nicht mechanisches Fertigungsverfahren nun vermieden werden.The object is solved with the features of the independent claims. In a method for manufacturing a rotor cup for an open-end spinning rotor, in which a front edge of the rotor cup is provided with separating structures for interrupting and preparing a yarn end for piecing, it is provided that the separating structures are applied by a non-mechanical manufacturing process. In the context of the present invention, a non-mechanical manufacturing method is understood as meaning a method in which the separating structures are introduced without pressure, ie without the application of forces to the rotor cup during the production of the separating structures. With such a non-mechanical or pressureless manufacturing method, the separating structures can be introduced into the edge of the open-end spinning rotor in a particularly gentle manner, without deforming or even damaging it. Due to the very high speeds of up to 180,000 rpm at which today's open-end spinning rotors rotate, even when only small actuation forces are applied, such as those that occur when cutting the rotor edge, deformation of the rotor and subsequent imbalances can occur come into operation. This can now be avoided by applying the separating structures using a non-mechanical manufacturing process.

Besonders vorteilhaft ist es dabei, wenn die Trennstrukturen durch ein nichtmechanisches Abtragungsverfahren aufgebracht werden, da die Trennstrukturen hierdurch fest mit der Rotortasse bzw. dem offenen Rand der Rotortasse verbunden sind. Mittels derartiger nichtmechanischer Fertigungsverfahren ist es möglich, die Trennstrukturen in Form einer Mikroprofilierung mit einer Profiltiefe von weniger als 100 µm aufzubringen. Vorteilhaft dabei ist es, dass durch das nichtmechanische Abtragen bzw. Beschichten die Kanten der Trennstrukturen vergleichsweise scharfkantig ausgebildet werden können. Die scharfkantigen Trennstrukturen können daher das zum Anspinnen vorzubereitende Garnende besonderes wirkungsvoll auffräsen und zuverlässig durchtrennen.It is particularly advantageous if the separating structures are applied by a non-mechanical removal method, since the separating structures are thereby firmly connected to the rotor cup or the open edge of the rotor cup. Using such non-mechanical manufacturing processes, it is possible to apply the separating structures in the form of microprofiling with a profile depth of less than 100 μm. It is advantageous here that the edges of the separating structures can be formed with comparatively sharp edges as a result of the non-mechanical removal or coating. The sharp-edged separation structures can therefore effectively mill and reliably cut the yarn end to be prepared for piecing.

Bei einer Rotortasse für einen Offenend-Spinnrotor, die eine innere Rotorwand und eine äußere Rotorwand, einen Rotorboden sowie eine dem Rotorboden gegenüberliegenden Öffnung aufweist und bei der ein stirnseitiger Rand der Rotortasse mit Trennstrukturen zum Unterbrechen und Vorbereiten eines Garnendes zum Anspinnen versehen ist, ist es vorgesehen, dass die Trennstrukturen eine Oberfläche mit einem Mikroprofil aufweisen, d.h. einem Profil, dessen Profiltiefe weniger als 100 µm beträgt. Ein derartiges Mikroprofil wird mit den beschriebenen nichtmechanischen Verfahren aufgebracht. Zudem ist mittels eines derartigen Mikroprofils eine besonders garnschonende und dennoch effektive Garnendenvorbereitung möglich. Besonders vorteilhaft bei einem solchen Mikroprofil ist es weiterhin, dass die Gefahr eines Hängenbleibens von Fasern nach der Garnendenpräparation reduziert ist.In a rotor cup for an open-end spinning rotor, which has an inner rotor wall and an outer rotor wall, a rotor base and an opening opposite the rotor base, and in which a front edge of the rotor cup is provided with separating structures for interrupting and preparing a yarn end for piecing, it is provided that the separating structures have a surface with a microprofile, ie a profile whose profile depth is less than 100 microns. Such a microprofile is applied using the non-mechanical methods described. In addition, by means of such a microprofile, yarn end preparation that is particularly gentle on the yarn and yet effective is possible. It is also particularly advantageous with such a microprofile that the risk of fibers getting caught after the yarn end preparation is reduced.

Die Profiltiefe des Mikroprofils beträgt dabei vorzugsweise weniger als 50 µm und vorzugsweise mehr als 5 µm. Vorteilhaft ist es bei der Rotortasse weiterhin, wenn das Mikroprofil unregelmäßig ausgebildet ist. Mittels eines solchen unregelmäßigen Mikroprofils ist es in besonders vorteilhafter Weise möglich, eine erfolgreiche Garnendenpräparation für verschiedene Garnnummern und für verschiedene Rohmaterialien zu gewährleisten. Unter einem unregelmäßigen Mikroprofil wird dabei im Rahmen der vorliegenden Anmeldung ein Profil verstanden, dessen Höhe bzw. Tiefe, also der Abstand zwischen Hochpunkten und Tiefpunkten des Profils, jeweils variiert oder dessen Hochpunkte und/oder Tiefpunkte in ungleichen Abständen zueinander angeordnet sind.The profile depth of the microprofile is preferably less than 50 μm and preferably more than 5 μm. In the case of the rotor cup, it is also advantageous if the microprofile is irregular. By means of such an irregular microprofile, it is possible in a particularly advantageous manner to ensure successful yarn end preparation for different yarn counts and for different raw materials. In the context of the present application, an irregular microprofile is understood to be a profile whose height or depth, i.e. the distance between high points and low points of the profile, varies in each case or whose high points and/or low points are arranged at unequal distances from one another.

Ebenso ist es bei der Rotortasse vorteilhaft, wenn die Trennstrukturen in Form von Vertiefungen ausgebildet sind. Diese können, wie zuvor beschrieben, durch ein nichtmechanisches Abtragungsverfahren in besonders vorteilhafter Weise eingebracht werden. Möglich ist es aber auch, die Trennstrukturen in Form von Erhöhungen auszubilden. Hierzu ist es beispielsweise möglich, den offenen Rand der Rotortasse partiell mit einer Beschichtung zu versehen.In the case of the rotor cup, it is also advantageous if the separating structures are designed in the form of depressions. As described above, these can can be introduced in a particularly advantageous manner by a non-mechanical removal process. However, it is also possible to form the separating structures in the form of elevations. For this purpose it is possible, for example, to partially provide the open edge of the rotor cup with a coating.

Sollen die Trennstrukturen in Form von Vertiefungen vorgesehen werden, so ist es vorteilhaft, wenn die Trennstrukturen durch Laserabtragen aufgebracht werden. Durch Laserabtragen lässt sich ein Mikroprofil mit einer hohen Unregelmäßigkeit bzw. einer örtlich stark unterschiedlichen Abtragung erzeugen, die besonders vorteilhaft mit verschiedensten Applikationen eingesetzt werden kann. Es ist hierdurch nicht erforderlich, verschiedene Offenend-Spinnrotoren mit unterschiedlichen Trennstrukturen bereitzuhalten.If the separating structures are to be provided in the form of depressions, it is advantageous if the separating structures are applied by laser ablation. Laser ablation can be used to produce a microprofile with a high level of irregularity or ablation that varies greatly locally, which can be used particularly advantageously with a wide variety of applications. As a result, it is not necessary to have different open-end spinning rotors with different separating structures on hand.

Nach einer anderen Ausführung ist es vorteilhaft, wenn die Trennstrukturen durch ein elektrochemisches Abtragungsverfahren aufgebracht werden. Auch hierdurch ist es möglich, ein technologisch günstiges Mikroprofil, das für verschiedenste Anwendungen geeignet ist, zu erzeugen.According to another embodiment, it is advantageous if the separating structures are applied using an electrochemical removal process. This also makes it possible to produce a technologically favorable microprofile that is suitable for a wide variety of applications.

Vorteilhaft ist es, wenn die Trennstrukturen in Form von mehreren beabstandet zueinander, vorzugsweise äquidistant beabstandet zueinander, angeordneten Vertiefungen aufgebracht werden. Ebenso ist es bei der Rotortasse vorteilhaft, wenn der Rand mit mehreren beabstandet zueinander angeordneten Trennstrukturen, insbesondere Vertiefungen, versehen ist. Durch die Anordnung mehrerer Trennstrukturen nebeneinander kann die Durchtrennung des Garns auch dann sichergestellt werden, wenn der Spinnrotor nur eine oder sogar nur einen Teil einer Umdrehung ausführt. Der Rand der Rotortasse erhält hierdurch eine schleifende Wirkung, die aufgrund des Mikroprofils dennoch ein schonendes Öffnen der Fasern am Garnende ermöglicht.It is advantageous if the separating structures are applied in the form of a plurality of depressions which are spaced apart from one another, preferably equidistantly spaced apart from one another. It is also advantageous in the case of the rotor cup if the edge is provided with a plurality of separating structures, in particular depressions, arranged at a distance from one another. By arranging several separating structures next to one another, the severing of the yarn can also be ensured when the spinning rotor is only performing one revolution or even only part of a revolution. This gives the edge of the rotor cup a grinding effect, which, thanks to the micro-profile, nevertheless allows the fibers at the end of the yarn to be opened gently.

Bei dem Verfahren zur Herstellung der Rotortasse ist es weiterhin vorteilhaft, wenn die Rotortasse durch Drehen hergestellt wird, wobei das Drehen der Rotortasse und das Aufbringen der Trennstrukturen im selben Fertigungsgang erfolgen. Insbesondere beim Aufbringen der Trennstrukturen durch Laserabtragen ist es beispielsweise möglich, die Laservorrichtung an der Drehbank fest anzuordnen und den Laser auf den Rand der Rotortasse zu richten. Durch Weiterdrehen der Rotortasse jeweils um einen bestimmten Drehwinkel ist es dabei in einfacher Weise möglich, mehrere Trennstrukturen in beliebigen Abständen auf die Rotortasse aufzubringen.In the method for producing the rotor cup, it is also advantageous if the rotor cup is produced by turning, the turning of the rotor cup and the application of the separating structures taking place in the same production step. In particular when applying the separating structures by laser removal, it is possible, for example, to fix the laser device to the lathe and direct the laser at the edge of the rotor cup. By rotating the rotor cup further by a specific angle of rotation, it is possible in a simple manner to apply a plurality of separating structures to the rotor cup at any spacing.

Weiterhin ist es bei dem Verfahren vorteilhaft, wenn die Rotortasse mit einer Beschichtung, insbesondere mit einer Nickel-Diamant-Beschichtung versehen wird. Die Rotortasse ist hierdurch besonders verschleißbeständig. Dabei ist es wiederum vorteilhaft, wenn die Trennstrukturen nur in die Beschichtung eingebracht werden. Das Garn hat somit auch im Bereich der Trennstrukturen nur mit der widerstandsfähigen Beschichtung Kontakt, so dass eine vorzeitige Abnutzung der Rotortasse hierdurch vermieden werden kann.Furthermore, it is advantageous in the method if the rotor cup is provided with a coating, in particular with a nickel-diamond coating. This makes the rotor cup particularly wear-resistant. In this case, it is in turn advantageous if the separating structures are only introduced into the coating. The yarn is therefore only in contact with the resistant coating in the area of the separating structures, so that premature wear of the rotor cup can be avoided as a result.

Bei der Rotortasse ist es weiterhin vorteilhaft, wenn die Trennstrukturen über den gesamten Umfang der Rotortasse verteilt angeordnet sind. Hierdurch kann eine Durchtrennung und Vorbereitung des Garnendes unabhängig von einer Position des Spinnrotors bzw. unabhängig von einem Drehwinkel des Spinnrotors, welchen er während der Garnendenvorbereitung ausführt, erreicht werden. Zugleich kann hierdurch auch eine besonders gleichmäßige und reproduzierbare Garnendenvorbereitung erzielt werden.In the case of the rotor cup, it is also advantageous if the separating structures are distributed over the entire circumference of the rotor cup. As a result, the yarn end can be severed and prepared independently of a position of the spinning rotor or independently of an angle of rotation of the spinning rotor, which it executes during the preparation of the yarn ends. At the same time, a particularly uniform and reproducible yarn end preparation can be achieved in this way.

Besonders vorteilhaft ist es dabei, wenn die Trennstrukturen eine Breite von wenig als 0,5 mm, vorzugsweise weniger als 0,3 mm und besonders bevorzugt von weniger als 0,2 mm aufweisen.It is particularly advantageous if the separating structures have a width of less than 0.5 mm, preferably less than 0.3 mm and particularly preferably less than 0.2 mm.

Weiterhin ist es vorteilhaft, wenn die Trennstrukturen eine Tiefe oder eine Höhe von weniger als 100 µm, vorzugsweise von weniger als 70 µm und besonders bevorzugt von weniger als 50 µm aufweisen. Hierdurch wird eine feine Profilierung der Oberfläche des Randes der Rotortasse erreicht, welche eine gute und zuverlässige Garnendenpräparation sicherstellt und zugleich die mechanischen Eigenschaften der Rotortasse nicht beeinflusst. Ebenso wird auch durch die feinen Trennstrukturen mit einer Breite von weniger als 1 mm und bevorzugt weniger als 0,3 mm eine sehr feine Oberflächenstrukturierung erreicht, welche den Rundlauf der Rotortasse nicht beeinträchtigt.Furthermore, it is advantageous if the separating structures have a depth or a height of less than 100 μm, preferably less than 70 μm and in particular preferably have less than 50 microns. This achieves a fine profiling of the surface of the edge of the rotor cup, which ensures good and reliable yarn end preparation and at the same time does not affect the mechanical properties of the rotor cup. Likewise, the fine separating structures with a width of less than 1 mm and preferably less than 0.3 mm also result in a very fine surface structuring, which does not impair the concentricity of the rotor cup.

Daneben ist es vorteilhaft, wenn die Trennstrukturen, insbesondere die Vertiefungen, einen Abstand zwischen 0,2 mm und 1,5 mm, vorzugsweise 0,2 mm bis 1,0 mm und besonders bevorzugt von 0,3 mm bis 0,8 mm zueinander aufweisen. Sind die Trennstrukturen in einem derartigen Abstand angeordnet, so ergibt sich eine günstigste schleifende Wirkung. Es hat sich gezeigt, dass ein Abstand zwischen benachbarten Trennstrukturen mit den genannten Maßen in besonderem Maße für verschiedenste Garnarten und Garnnummern geeignet ist. Es ist jedoch auch möglich, die schleifende Wirkung auf den Faden durch den Abstand der Trennstrukturen zu beeinflussen, so dass je nach Abstand der Trennstrukturen der Offenend-Spinnrotor entweder für feinere oder für gröbere Garne oder für bestimmte Materialen besonders geeignet ist.In addition, it is advantageous if the separating structures, in particular the depressions, have a distance of between 0.2 mm and 1.5 mm, preferably 0.2 mm to 1.0 mm and particularly preferably 0.3 mm to 0.8 mm from one another exhibit. If the separating structures are arranged at such a distance, the result is a favorable rubbing effect. It has been shown that a distance between adjacent separating structures with the stated dimensions is particularly suitable for a wide variety of yarn types and yarn counts. However, it is also possible to influence the grinding effect on the thread by the distance between the separating structures, so that depending on the distance between the separating structures, the open-end spinning rotor is particularly suitable either for finer or for coarser yarns or for certain materials.

Nach einer Weiterbildung der Erfindung ist es vorteilhaft, wenn die Trennstrukturen bis in die innere Rotorwand und/oder bis in die äußere Rotorrwand hineinreichen. Die Sicherheit der Garndurchtrennung und Garnvorbereitung kann hierdurch erhöht werden, da auch dann noch eine Durchtrennung und Garnendenvorbereitung erfolgen kann, wenn das Garn in einem Winkel über die Kante des offenen Randes der Rotortasse geführt wird und somit nicht den flachen Rand direkt überstreicht.According to a development of the invention, it is advantageous if the separating structures reach into the inner rotor wall and/or into the outer rotor wall. The safety of yarn cutting and yarn preparation can be increased as a result, since cutting and yarn end preparation can still take place if the yarn is guided at an angle over the edge of the open edge of the rotor cup and thus does not sweep over the flat edge directly.

Weitere Vorteile der Erfindung werden anhand der nachfolgend dargestellten Ausführungsbeispiele beschrieben. Es zeigen:

Figur 1
eine schematische Schnittdarstellung einer Offenendspinnvorrichtung mit einem Spinnrotor während der Garnendenvorbereitung,
Figur 2
eine Draufsicht auf den offenen Rand der Rotortasse nach einer ersten Ausführung,
Figur 3
eine Draufsicht auf den offenen Rand einer Rotortasse nach einer zweiten Ausführung,
Figur 4
eine schematische, abgebrochen dargestellte, perspektivische Ansicht auf den offenen Rand einer Rotortasse,
Figur 5
eine schematische Querschnittsdarstellung durch eine Trennstruktur nach einer ersten Ausführung sowie
Figur 6
eine schematische Querschnittsdarstellung einer Trennstruktur nach einer zweiten Ausführung.
Further advantages of the invention are described using the exemplary embodiments presented below. Show it:
figure 1
a schematic sectional view of an open-end spinning device with a spinning rotor during yarn end preparation,
figure 2
a top view of the open edge of the rotor cup according to a first embodiment,
figure 3
a plan view of the open edge of a rotor cup according to a second embodiment,
figure 4
a schematic, broken perspective view of the open edge of a rotor cup,
figure 5
a schematic cross-sectional view through a separation structure according to a first embodiment, and
figure 6
a schematic cross-sectional representation of a separation structure according to a second embodiment.

Figur 1 zeigt eine schematische Schnittdarstellung einer Offenend-Spinnvorrichtung 2 mit einem Offenend-Spinnrotor 1. Der Offenend-Spinnrotor 1 ist in üblicher Weise in einem Rotorgehäuse 3 gelagert, wobei das Rotorgehäuse 3 während des regulären Spinnbetriebs über einen Unterdruckkanal 8 mit Unterdruck beaufschlagt wird und mittels eines Deckels 4 verschlossen wird. Der Offenend-Spinnrotor 1 weist dabei einen Rotorschaft 9 auf, mittels welchem er in dem Rotorgehäuse 3 gelagert ist, sowie eine Rotortasse 10, in welcher in ebenfalls bekannter Weise ein Garn 5 hergestellt wird. Das Garn 5 wird während des regulären Spinnbetriebs über eine in dem Deckel 4 gelagerte Abzugsdüse 6 sowie gegebenenfalls ein Abzugsröhrchen 7 abgezogen und einer hier nicht dargestellten Spulvorrichtung zugeführt, wo es auf eine Spule aufgewickelt wird. figure 1 shows a schematic sectional view of an open-end spinning device 2 with an open-end spinning rotor 1. The open-end spinning rotor 1 is mounted in the usual way in a rotor housing 3, with the rotor housing 3 being subjected to negative pressure during regular spinning operation via a negative pressure channel 8 and by means of a Cover 4 is closed. The open-end spinning rotor 1 has a rotor shaft 9, by means of which it is mounted in the rotor housing 3, and a rotor cup 10, in which a yarn 5 is also produced in a known manner. The yarn 5 is drawn off during regular spinning operation via a draw-off nozzle 6 mounted in the cover 4 and optionally a draw-off tube 7 and fed to a winding device, not shown here, where it is wound onto a spool.

Die Rotortasse 10 des Offenend-Spinnrotors 1 weist in ebenfalls üblicher Weise eine innere Rotorwand 12 auf, auf welche die zu verspinnenden Fasern aufgespeist werden, eine Fasersammelrille 15, in welcher die Fasern sich in Form eines Faserrings anlagern und in das Ende des bereits produzierten Garns 5 eingebunden werden, sowie einen Rotorboden 14, an welchem die Rotortasse 10 mit dem Rotorschaft 9 verbunden ist. Gegenüberliegend des Rotorbodens 14 weist die Rotortasse 10 eine Öffnung 11 auf, in welche im regulären Spinnbetrieb ein Ansatz des Deckels 4, welcher die Abzugsdüse 6 trägt, hineinragt, so dass das Garn 5 über die Abzugsdüse 6 und das Abzugsröhrchen 7 abgezogen werden kann. Weiterhin weist die Rotortasse 10 noch eine äußere Rotorwand 13 sowie einen stirnseitigen Rand 16 auf, welcher sich zwischen der äußeren Rotorwand 13 und der inneren Rotorwand 12 erstreckt und zusammen mit der inneren Rotorwand 12 die Öffnung 11 begrenzt.The rotor cup 10 of the open-end spinning rotor 1 also has, in a conventional manner, an inner rotor wall 12 onto which the fibers to be spun are fed, a fiber collecting groove 15 in which the fibers accumulate in the form of a fiber ring and into the end of the yarn already produced 5 are integrated, as well as a rotor base 14, on which the rotor cup 10 is connected to the rotor shaft 9. Opposite the rotor base 14, the rotor cup 10 has an opening 11 into which a projection of the cover 4, which carries the draw-off nozzle 6, protrudes during regular spinning operation, so that the yarn 5 can be drawn off via the draw-off nozzle 6 and the draw-off tube 7. Furthermore, the rotor cup 10 also has an outer rotor wall 13 and a front edge 16 which extends between the outer rotor wall 13 and the inner rotor wall 12 and together with the inner rotor wall 12 delimits the opening 11 .

Kommt es nun während der Produktion des Garns 5 zu einem Bruch oder einem Qualitätsschnitt, so muss ein Garnende 5a zum Wiederanspinnen definiert abgelängt und vorbereitet werden, damit es anschließend in die Fasersammelrille 15 der Rotortasse 10 zurückgeführt und wieder angesponnen werden kann. Das Durchtrennen des Garns 5 sowie das Vorbereiten des Garnendes 5a zum Wiederanspannen erfolgt dabei an dem stirnseitigen Rand 16. Hierzu wird das Garnende 5 durch das Abzugsröhrchen 7 und die Abzugsdüse 6 in das Rotorgehäuse 3 geführt und in den Unterdruckkanal 8 eingesaugt, wo es durch die Wirkung des Unterdrucks festgehalten wird. Wie der Figur 1 entnehmbar, wird dabei das Garnende 5a über den stirnseitigen Rand 16 der Rotortasse 10 geführt. Der Rand 16 ist zum Vorbereiten des Garnendes 5a mit Trennstrukturen 17 (siehe Figuren 2-6) versehen. Der Offenend-Spinnrotor 1 wird während der Garnendenvorbereitung rotiert, so dass das über den Rand 16 geführte bzw. auf dem Rand 16 aufliegende Garnende 5a durch eine sägende bzw. schleifende Wirkung der Trennstrukturen 17 durchtrennt und aufgefasert wird.If a breakage or a quality cut occurs during production of the yarn 5, a yarn end 5a must be cut to length and prepared for re-piecing in a defined manner so that it can then be returned to the fiber collection groove 15 of the rotor cup 10 and piecing again. The cutting of the yarn 5 and the preparation of the yarn end 5a for re-tightening takes place at the front edge 16. For this purpose, the yarn end 5 is guided through the discharge tube 7 and the discharge nozzle 6 into the rotor housing 3 and sucked into the vacuum channel 8, where it is drawn through the Effect of the negative pressure is recorded. Again figure 1 removed, the yarn end 5a is guided over the front edge 16 of the rotor cup 10. The edge 16 is for preparing the yarn end 5a with separating structures 17 (see Figures 2-6 ) Mistake. The open-end spinning rotor 1 is rotated during the preparation of the yarn ends, so that the yarn end 5a guided over the edge 16 or resting on the edge 16 is severed and frayed by a sawing or grinding effect of the separating structures 17 .

Abhängig von den geometrischen Gegebenheiten der Spinnvorrichtung 2 und je nach Verfahrensführung kann dabei das Garnende 5a dem bereits rotierenden Spinnrotor 1 zugeführt werden oder das Garnende 5a kann zunächst auf den stirnseitigen Rand 16 des noch stehenden Offenend-Spinnrotors 1 aufgelegt werden und der Offenend-Spinnrotor 1 erst dann in Rotation versetzt werden.Depending on the geometric conditions of the spinning device 2 and depending on the process, the yarn end 5a can be fed to the already rotating spinning rotor 1, or the yarn end 5a can first be placed on the front edge 16 of the open-end spinning rotor 1 that is still standing and the open-end spinning rotor 1 only then be set in rotation.

Die Trennstrukturen17 (siehe Figuren 2 bis 6) können dabei als Erhöhungen 22 oder Vertiefungen 18 ausgeführt sein und in verschiedener Weise in den Rand 16 eingebracht werden. Vorliegend wird vorgeschlagen, die Trennstrukturen 17 durch ein nicht mechanisches Fertigungsverfahren anzubringen, welches die Trennstrukturen 17 drucklos aufbringt und daher die mechanischen Eigenschaften der Rotortasse 10 nicht beeinflusst. Besonders vorteilhaft ist es dabei, wenn Trennstrukturen 17 berührungslos bzw. ohne einen Kontakt zwischen dem Werkzeug und dem Werkstück, hier der Rotortasse 10, aufgebracht werden. Dies ist beispielsweise durch Laserabtragen oder elektrochemisches Abtragen möglich. Ebenso ist es aber auch möglich, den Rand 16 in einzelnen Teilbereichen partiell zu beschichten, wobei die beschichteten Teilbereiche dann jeweils eine Trennstruktur 17 ausbilden.The separation structures17 (see Figures 2 to 6 ) can be designed as elevations 22 or depressions 18 and can be introduced into the edge 16 in various ways. In the present case, it is proposed to attach the separating structures 17 using a non-mechanical production method, which applies the separating structures 17 without pressure and therefore does not affect the mechanical properties of the rotor cup 10 . It is particularly advantageous if separating structures 17 are applied without contact or without contact between the tool and the workpiece, in this case the rotor cup 10 . This is possible, for example, by laser ablation or electrochemical ablation. However, it is also possible to partially coat the edge 16 in individual partial areas, with the coated partial areas then forming a separating structure 17 in each case.

Figur 2 zeigt eine erste Ausführung einer Rotortasse 10 mit Trennstrukturen 17, welche nicht über den gesamten Umfang, sondern nur an vorliegend zwei gegenüberliegenden Teilbereichen aufgebracht sind. Dargestellt ist dabei eine Draufsicht auf die Öffnung 11 und den stirnseitigen Rand 16 der Rotortasse 10. Weiterhin ist der Rotorboden 14 sowie ein Teil der äußeren Rotorwand 13 erkennbar. In vorliegendem Beispiel sind dabei mehrere Trennstrukturen 17 äquidistant beabstandet zueinander angeordnet. Dabei ist eine erste Anzahl von Trennstrukturen 17 in einem ersten Teilbereich des Randes 16 und eine zweite Anzahl von Trennstrukturen 17 in einem zweiten Teilbereich des Randes 16 vorgesehen. Abweichend von der gezeigten Darstellung wäre es natürlich auch möglich, die Trennstrukturen 17 in ungleichmäßigen Abständen anzuordnen. Ebenso wäre es natürlich auch denkbar, nur einen einzigen Teilbereich des Randes 16 mit einer Anzahl an Trennstrukturen 17 zu versehen oder mehr als zwei Teilbereiche mit Trennstrukturen 17 zu versehen. figure 2 shows a first embodiment of a rotor cup 10 with separating structures 17, which are not applied over the entire circumference, but only in the present case on two opposite partial areas. A top view of the opening 11 and the front edge 16 of the rotor cup 10 is shown. The rotor base 14 and part of the outer rotor wall 13 can also be seen. In the present example, a plurality of separating structures 17 are arranged equidistantly from one another. A first number of separating structures 17 is provided in a first partial area of the edge 16 and a second number of separating structures 17 in a second partial area of the edge 16 . Deviating from the representation shown, it would of course also be possible to arrange the separating structures 17 at non-uniform distances. Of course, it would also be conceivable to have just one to provide a single partial area of the edge 16 with a number of separating structures 17 or to provide more than two partial areas with separating structures 17 .

Figur 3 zeigt eine andere Ausführung einer Rotortasse 10, bei welcher die Trennstrukturen 17 ebenfalls äquidistant zueinander beabstandet, jedoch über den gesamten Umfang der Rotortasse 10 bzw. des Randes 16 verteilt sind. Auch hier wäre es natürlich abweichend von der gezeigten Darstellung möglich, die Trennstrukturen 17 mit unregelmäßigen Abständen anzuordnen oder auch wesentlich weniger, beispielsweise nur 5 einzelne Trennstrukturen 17, über den Umfang des Randes 16 verteilt anzuordnen. figure 3 shows another embodiment of a rotor cup 10, in which the separating structures 17 are also spaced equidistantly from one another, but are distributed over the entire circumference of the rotor cup 10 or the edge 16. Here, too, it would of course be possible, deviating from the illustration shown, to arrange the separating structures 17 at irregular intervals or also to arrange significantly fewer, for example only 5 individual separating structures 17 distributed over the circumference of the edge 16 .

Figur 4 zeigt in vergrößerter Darstellung einen Ausschnitt des Randes 16 einer Rotortasse 10, wobei wiederum die nebeneinander angeordneten Trennstrukturen 17 erkennbar sind. Die Trennstrukturen 17 weisen dabei eine Oberfläche mit einem Mikroprofil 20 auf, das vorliegend nur an einer Trennstruktur angedeutet ist und im Folgenden anhand der Figuren 5 und 6 noch näher beschrieben wird. Auch hier sind die einzelnen Trennstrukturen 17 wiederum äquidistant in einem Abstand A zueinander angeordnet. Der Abstand A beträgt im gezeigten Beispiel ca. 0,5 mm, wobei die einzelnen Trennstrukturen 17 eine Breite B von ca. 0,15 mm aufweisen. Eine derartige, vergleichsweise feine Anordnung von Trennstrukturen 17 hat sich als vorteilhaft für die zuverlässige Durchtrennung und Vorbereitung verschiedenster Garne erwiesen. figure 4 shows an enlarged view of a section of the edge 16 of a rotor cup 10, the separating structures 17 arranged next to one another being visible again. The separating structures 17 in this case have a surface with a microprofile 20, which is only indicated in the present case on a separating structure and is explained below with reference to FIG Figures 5 and 6 will be described in more detail. Here, too, the individual separating structures 17 are again arranged equidistantly at a distance A from one another. The distance A is approximately 0.5 mm in the example shown, with the individual separating structures 17 having a width B of approximately 0.15 mm. Such a comparatively fine arrangement of separating structures 17 has proven to be advantageous for the reliable severing and preparation of a wide variety of yarns.

Wie der Figur 4 weiterhin entnehmbar, sind dabei die Trennstrukturen 17 nicht nur direkt auf dem flachen stirnseitigen Rand 16 der Rotortasse 10 angebracht, sondern erstrecken sich noch ein Stück weit bis in die äußere Rotorwand 13 bzw. die innere Rotorwand 12 hinein. Es wird somit auch dann eine zuverlässige Garnendenvorbereitung erreicht, wenn das Garnende 5a nicht flach über den Rand 16 geführt wird, sondern diesen nur in den Randbereichen in einem Winkel streift.Again figure 4 can also be removed, the separating structures 17 are not only attached directly to the flat front edge 16 of the rotor cup 10, but also extend a little further into the outer rotor wall 13 or the inner rotor wall 12. Reliable yarn end preparation is thus also achieved when the yarn end 5a is not guided flat over the edge 16 but only touches it at an angle in the edge regions.

Figur 5 zeigt einen Querschnitt durch eine Trennstruktur 17 in abgebrochener Darstellung. Die Trennstruktur 17 ist vorliegend als Vertiefung 18 ausgebildet und weist eine Oberfläche mit einem Mikroprofil 20 auf. Unter einem Mikroprofil 20 wird dabei im Rahmen der vorliegenden Anmeldung ein Profil verstanden, welches eine Profiltiefe PT von weniger als 100 µm aufweist. Die Profiltiefe T ist, wie der Figur 5 entnehmbar, dabei als der Abstand zwischen dem höchst gelegenen und dem tiefst gelegenen Punkt des Mikroprofils 20 bzw. als maximaler Höhenunterschied der Oberfläche des Mikroprofils 20 definiert. Weiterhin ist die Tiefe T der Trennstruktur 17 erkennbar, welche sich von der ursprünglichen Oberfläche des stirnseitigen Randes 16 bis zum tiefsten Punkt des Mikroprofils 20 erstreckt. Weiterhin ist wiederum die Breite B der Trennstruktur 17 bezeichnet. figure 5 shows a cross section through a separating structure 17 in a broken representation. In the present case, the separating structure 17 is designed as a depression 18 and has a surface with a microprofile 20 . In the context of the present application, a microprofile 20 is understood to mean a profile which has a profile depth PT of less than 100 μm. The tread depth T is like that figure 5 removed, defined as the distance between the highest and the lowest point of the micro-profile 20 or as the maximum height difference of the surface of the micro-profile 20. Furthermore, the depth T of the separating structure 17 can be seen, which extends from the original surface of the front edge 16 to the deepest point of the microprofile 20 . Furthermore, the width B of the separating structure 17 is again indicated.

Das Mikroprofil 20 ist in vorliegendem Beispiel unregelmäßig ausgebildet und weist einzelne Spitzen auf, welche unterschiedlich hoch sind und auch an unterschiedlichen Stellen bezogen auf die Breite B der Trennstruktur 17 angeordnet sind. Ebenso sind die einzelnen Spitzen auch in Längsrichtung der Trennstruktur 17 in unregelmäßiger Folge angeordnet, wie in der Figur 4 anhand der untersten Trennstruktur 17 symbolisiert. An den Kanten 23 ist die Trennstruktur 17 scharfkantig ausgebildet, so dass die Kanten 23 als Schneidkanten wirken und die Trennstruktur 17 eine besonders gute sägende bzw. fräsende Wirkung auf das Garn hat.In the present example, the microprofile 20 is formed irregularly and has individual peaks which are of different heights and are also arranged at different points in relation to the width B of the separating structure 17 . Likewise, the individual peaks are also arranged in an irregular sequence in the longitudinal direction of the separating structure 17, as in FIG figure 4 symbolized by the lowest separating structure 17. The separating structure 17 has sharp edges at the edges 23, so that the edges 23 act as cutting edges and the separating structure 17 has a particularly good sawing or milling effect on the yarn.

Die vorliegende Rotortasse 10 ist weiterhin mit einer Beschichtung 19 versehen, welche auf das Grundmaterial 21 der Rotortasse 10 aufgebracht ist. Die Trennstrukturen 17 bzw. das Mikroprofil 20 sind dabei nur in die Beschichtung 19 eingebracht und reichen nicht bis in das Grundmaterial 21 hinein. Hierdurch wird besonders vorteilhaft erreicht, dass auch innerhalb der Trennstruktur 17 die verschleißmindernde Wirkung der Beschichtung 19 noch vorhanden ist und es somit nicht zu einer übermäßigen Abnutzung im Bereich der Trennstruktur 17 kommt.The present rotor cup 10 is also provided with a coating 19 which is applied to the base material 21 of the rotor cup 10 . The separating structures 17 or the microprofile 20 are only introduced into the coating 19 and do not extend into the base material 21 . In this way, it is achieved in a particularly advantageous manner that the wear-reducing effect of the coating 19 is also still present within the separating structure 17 and excessive wear in the area of the separating structure 17 does not occur.

Die Beschichtung 19 ist vorzugsweise als Nickel-Diamant-Beschichtung ausgebildet. Je nach Ausführung der Rotortasse 10 wäre es aber natürlich auch möglich, die Trennstrukturen 17 direkt in das Grundmaterial 21 der Rotortasse 10 einzubringen. Weiterhin sind natürlich auch andere Beschichtungen oder Oberflächenbehandlungen der Rotortasse 10 möglich.The coating 19 is preferably designed as a nickel-diamond coating. Depending on the design of the rotor cup 10, it would of course also be possible to introduce the separating structures 17 directly into the base material 21 of the rotor cup 10. Of course, other coatings or surface treatments of the rotor cup 10 are also possible.

Figur 6 zeigt schließlich noch eine andere Ausführung einer Trennstruktur 17, welche in Form einer Erhöhung 22 vorgesehen ist. Auch hier sind die Kanten 23, von denen hier nur eine bezeichnet ist, vergleichsweise scharfkantig ausgeführt. Gezeigt ist wiederum ein Querschnitt durch die Trennstruktur 17 in abgebrochener Darstellung. Eine solche Erhöhung 22 kann beispielsweise durch eine partielle Beschichtung des Randes 16 der Rotortasse 10 hergestellt werden, wobei ebenfalls eine scharfkantige Kante 23 erzeugt werden kann. Ebenso ist es auch mittels Laserabtragung möglich, ein Mikroprofil 20 zu erzeugen, welches zumindest teilweise in Form von Erhöhungen 22 aus der Oberfläche des Randes 16 vorliegt. Gemäß vorliegendem Beispiel ist dabei die Profiltiefe PT kleiner als die Höhe H der Trennstruktur 17. Möglich wäre es aber auch, dass die Profiltiefe PT gleich der Höhe H der Trennstruktur 17 ist. figure 6 finally shows another embodiment of a separating structure 17, which is provided in the form of an elevation 22. Here, too, the edges 23, of which only one is designated here, are comparatively sharp-edged. A cross section through the separating structure 17 is again shown in a broken representation. Such an increase 22 can be produced, for example, by a partial coating of the edge 16 of the rotor cup 10, in which case a sharp-edged edge 23 can also be produced. Likewise, it is also possible by means of laser ablation to produce a microprofile 20 which is present at least partially in the form of elevations 22 on the surface of the edge 16 . According to the present example, the profile depth PT is smaller than the height H of the separating structure 17. However, it would also be possible for the profile depth PT to be equal to the height H of the separating structure 17.

Weiterhin ist es nach einer nicht gezeigten Ausführung auch möglich, dass die Trennstruktur 17 zwar in Form einer Vertiefung 18 ausgebildet ist, das Mikroprofil 20 jedoch einen höchsten Punkt oberhalb der Oberfläche des Randes 16 aufweist. Die Profiltiefe PT wäre in diesem Fall größer als die Tiefe T der Vertiefung. Ebenso wäre es auch im Falle einer Erhöhung 22 möglich, dass ein tiefster Punkt des Mikroprofils 20 dennoch unterhalb der Oberfläche des Randes 16 liegt, so dass die Profiltiefe PT größer wäre als die Höhe H der Erhöhung.Furthermore, according to an embodiment that is not shown, it is also possible for the separating structure 17 to be in the form of a depression 18, but for the microprofile 20 to have a highest point above the surface of the edge 16. In this case, the profile depth PT would be greater than the depth T of the depression. Likewise, it would also be possible in the case of an elevation 22 that a lowest point of the microprofile 20 is nevertheless below the surface of the edge 16, so that the profile depth PT would be greater than the height H of the elevation.

Die Erfindung ist nicht auf die dargestellten Ausführungsbeispiele beschränkt. Abwandlungen und Kombinationen im Rahmen der Patentansprüche fallen ebenfalls unter die Erfindung.The invention is not limited to the exemplary embodiments shown. Modifications and combinations within the scope of the patent claims also fall under the invention.

Bezugszeichenlistereference list

11
Offenend-Spinnrotoropen-end spinning rotor
22
Offenend-Spinnvorrichtungopen-end spinning device
33
Rotorgehäuserotor case
44
Deckellid
55
Garnyarn
5a5a
Garnendeyarn end
66
Abzugsdüsetrigger nozzle
77
Abzugsröhrchenvent tube
88th
Unterdruckkanalvacuum channel
99
Rotorschaftrotor shaft
1010
Rotortasserotor cup
1111
Öffnungopening
1212
Innere Rotorwandinner rotor wall
1313
Äußere RotorwandOuter rotor wall
1414
Rotorbodenrotor bottom
1515
Fasersammelrillefiber collection groove
1616
Stirnseitiger Rand der Öffnung der RotortasseFront edge of the opening of the rotor cup
1717
Trennstrukturenseparation structures
1818
Vertiefungdeepening
1919
Beschichtungcoating
2020
Mikroprofilmicro profile
2121
Grundmaterialbase material
2222
Erhöhungincrease
2323
Kanteedge
PTpt
Profiltiefetread depth
BB
Breite der TrennstrukturenWidth of the separation structures
AA
Abstand der TrennstrukturenDistance of the separation structures
TT
Tiefe der Trennstrukturendepth of the separation structures
HH
Höhe der TrennstrukturenHeight of the separation structures

Claims (15)

  1. Method for producing a rotor cup (10) for an open-end spinning rotor (1), with which a front-side rim (16) of the rotor cup (10) is provided with separating structures (17) for breaking up and preparing a yarn end (5a) for piecing, characterized in that the separating structures (17) are applied by a non-mechanical manufacturing method, in particular by a non-mechanical ablation method, in the form of microprofiling with a profile depth (PT) of less than 100 µm can be applied..
  2. Method according to the previous claim, characterized in that the separating structures (17) are applied by means of laser ablation.
  3. Method according to one of the preceding claims, characterized in that the separating structures (17) are applied by an electro-chemical ablation method.
  4. Method according to one of the preceding claims, characterized in that the separating structures (17) are applied in the form of a multiple number of depressions (18) that are arranged in a manner spaced apart from each other, preferably equidistantly from each other.
  5. Method according to one of the preceding claims, characterized in that the rotor cup (10) is produced by turning, whereas the turning of the rotor cup (10) and the applying of the separating structures (17) take place in the same production process.
  6. Method according to one of the preceding claims, characterized in that the rotor cup (10) is provided with a coating (19), in particular with a nickel-diamond coating, and the separating structures (17) are preferably introduced only in the coating.
  7. Rotor cup (10) for an open-end spinning rotor (1) with an inner rotor wall (12) and an outer rotor wall (13), a rotor bottom (14) and a front-side rim (16) opposite the rotor bottom (14), which is provided with separating structures (17) for breaking up and preparing a yarn end (5a) for piecing, characterized in that the separating structures (17) feature a surface with a micro-profile (20) having a profile depth of less than 100 µm.
  8. Rotor cup (10) according to the preceding claim, characterized in that the profile depth (PT) of the micro-profile (20) amounts to less than 50 microns and preferably more than 5 microns.
  9. Rotor cup (10) according to one of the preceding device claims, characterized in that the micro-profile (20) is formed to be irregular.
  10. Rotor cup (10) according to one of the preceding device claims, characterized in that the rim (16) of the rotor cup (10) is provided with a multiple number of separating structures (17) that are arranged in a manner spaced apart from each other, preferably equidistantly from each other, in particular with separating structures (17) in the form of depressions (18).
  11. Rotor cup (10) according to one of the preceding device claims, characterized in that the separating structures (17) are arranged in a manner distributed over the entire circumference of the rotor cup (10).
  12. Rotor cup (10) according to one of the preceding device claims, characterized in that the separating structures (17) feature a width (B) of less than 0.5 mm, preferably less than 0.3 mm and particularly preferably less than 0.2 mm and/or that the separating structures (17) feature a depth (T) or height (H) of less than 100 µm, preferably less than 70 µm and particularly preferably less than 50 µm.
  13. Rotor cup (10) according to one of the preceding device claims, characterized in that the separating structures (17), in particular the depressions (18), feature a spacing (A) between 0.2 mm and 1.5 mm, preferably 0.2 mm to 1.0 mm and particularly preferably 0.3 mm to 0.8 mm relative to each another.
  14. Rotor cup (10) according to one of the preceding device claims, characterized in that the separating structures (17) extend into the inner rotor wall (12) and/or into the outer rotor wall (13).
  15. Rotor cup (10) according to one of the preceding device claims, characterized in that the rotor cup (10) features a coating (19), in particular a nickel-diamond coating, whereas the separating structures (17) are preferably introduced only in the coating (19).
EP18176280.8A 2017-06-13 2018-06-06 Rotor socket for an open-end spinning rotor and method for manufacturing a rotor socket for an open-end spinning rotor Active EP3415670B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017113029.2A DE102017113029A1 (en) 2017-06-13 2017-06-13 Method for producing a rotor cup for an open-end spinning rotor and rotor cup for an open-end spinning rotor

Publications (2)

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EP3415670A1 EP3415670A1 (en) 2018-12-19
EP3415670B1 true EP3415670B1 (en) 2022-02-23

Family

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US (1) US10753013B2 (en)
EP (1) EP3415670B1 (en)
CN (1) CN109082736A (en)
DE (1) DE102017113029A1 (en)
TW (1) TWI787273B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19509742A1 (en) * 1995-03-17 1996-09-19 Fritz Stahlecker Open end spinning rotor having increased working life

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DE3429511A1 (en) * 1984-08-10 1986-02-20 W. Schlafhorst & Co, 4050 Mönchengladbach SPINNING ROTOR FOR A OE SPINNING MACHINE AND METHOD FOR PRODUCING THE SPINNING ROTOR
DE3810775C2 (en) 1988-03-30 1996-05-23 Schlafhorst & Co W Spinning rotor
DE4101680A1 (en) * 1991-01-22 1992-07-23 Winfried Heinzel Sliver loosening roller - is cleaned and coated with wear resistant layer and wear and corrosion resistant layer
DE19651419A1 (en) * 1996-12-11 1998-06-18 Fritz Stahlecker Open end spinning rotor
DE19713359B4 (en) * 1997-03-29 2005-12-08 Saurer Gmbh & Co. Kg Spinning rotor for an open-end spinning machine and method for its coating
DE19822265B4 (en) * 1997-06-13 2006-07-06 Rieter Ingolstadt Spinnereimaschinenbau Ag Open-end spinning rotor and method for its production
DE19947547A1 (en) * 1999-10-02 2001-04-05 Schlafhorst & Co W Spinning rotor has surfaces with a coating consisting of an intermediate layer which is free from hard material between two hard material-containing layers in contact with the fibers and thread
DE10334758B4 (en) * 2002-08-19 2013-12-05 Rieter Ingolstadt Gmbh Turntable of a spinning machine and spinning machine
CN201381399Y (en) * 2009-04-03 2010-01-13 中国科学院金属研究所 Cup for textile machinery
CZ2011773A3 (en) 2011-11-28 2013-01-09 Rieter Cz S.R.O. Method of preparing end of yarn for spinning on rotor spinning machines and spinning rotor per se
DE102015103229A1 (en) * 2015-03-05 2016-09-08 Maschinenfabrik Rieter Ag Rotor plate, spinning rotor and method for producing a rotor cup of a spinning rotor
DE102015007819A1 (en) * 2015-06-18 2016-12-22 Saurer Germany Gmbh & Co. Kg Spinning rotor for an open-end spinning device operating at high rotor speeds
DE102015114731A1 (en) * 2015-09-03 2017-03-09 Maschinenfabrik Rieter Ag Open-end spinning rotor with a rotor cup made of heat-treatable steel material
DE102015117204A1 (en) 2015-10-08 2017-04-13 Rieter Ingolstadt Gmbh Process for preparing a yarn end for piecing on a rotor spinning device of a rotor spinning machine and rotor spinning machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19509742A1 (en) * 1995-03-17 1996-09-19 Fritz Stahlecker Open end spinning rotor having increased working life

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Publication number Publication date
US10753013B2 (en) 2020-08-25
DE102017113029A1 (en) 2018-12-13
CN109082736A (en) 2018-12-25
TW201903230A (en) 2019-01-16
US20180355522A1 (en) 2018-12-13
EP3415670A1 (en) 2018-12-19
TWI787273B (en) 2022-12-21

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