Rotor and textile machine

Abstract

The invention relates to a rotor for a textile machine, in particular a rotor spinning machine, comprising a rotor wall having a fiber sliding surface. In order to improve flexibility in use, increase rotor stability and reduce resource consumption, a rotor for a textile machine, in particular a rotor spinning machine, is provided, comprising a rotor base integrally formed with a groove, where the rotor wall and the rotor base are separate components, and wherein the rotor wall and the rotor base are arranged relative to each other such that the fiber sliding surface opens into the groove.

Description

[0001] The invention relates to a rotor. The invention relates to a textile machine. The invention relates to a method for forming a rotor. The invention relates to the use of a rotor and / or a textile machine.

[0002] Rotors for textile machines, in particular (open-end) rotor spinning machines, are known in the prior art.

[0003] DE 198 48 118 A1 describes a spinning rotor as a rotor for an open-end spinning device, which consists of at least three rotor parts. A first rotor part comprises a fiber sliding wall (also called a fiber sliding wall with a fiber sliding surface) and is connected to a second rotor part formed by a rotor base fastened to the rotor shaft, so that the first rotor part and the second rotor part fix a third rotor part, i.e. a ring element, between which the third rotor part, i.e. a ring element, receives at least a part of the fiber collecting groove.

[0004] DE 196 51 419 A1 describes an integrated OE spinning rotor (open-end spinning rotor) as a rotor comprising fiber collecting grooves (also referred to as grooves for short).

[0005] DE 198 46 770 A1 describes a rotor for an open-end spinning machine, which consists of a rotationally driven, rotationally symmetrical pot-shaped housing, which is essentially open on one side and forms a radially outwardly widening inlet bevel in cross section, which opens into a rotor groove (as a groove) near the housing base. In order to avoid having to replace the entire rotor in the event of wear of the rotor groove or in the event of wear of the rotor as a whole, it is described that the rotor is formed in at least two parts and consists of an upper rotor part and a lower rotor part, which are detachably connected to each other and between which a wear ring forming the rotor groove is arranged for replacement.

[0006] JP H08 311727A, EP 0 170 877 A1, CN 104 762 703A disclose two-piece rotors with split fiber collecting grooves.

[0007] In particular, the described rotors present difficulties with regard to flexibility in relation to specific applications, as well as difficulties with regard to stability of the rotor in specific applications. This leads to increased resource consumption, for example due to the need to replace parts of the rotor, the entire rotor or a corresponding shutdown of the rotor spinning machine.

[0008] It is therefore an object of the present invention to increase flexibility of use, to increase rotor stability and to reduce resource consumption.

[0009] This object is achieved by a rotor having the features of claim 1. This object is achieved by a textile machine having the features of claim 11. This object is achieved by a method having the features of claim 12. This object is achieved by a use having the features of claim 13.

[0010] Advantageous embodiments of the invention are subject matter of the dependent claims.

[0011] According to one aspect, a rotor is formed with at least two parts and is intended for a textile machine. The textile machine may be a rotor spinning machine, in particular a free-end rotor spinning machine. The rotor comprises a rotor wall. The rotor wall has a fiber sliding surface. The rotor comprises a rotor base. The rotor base is formed integrally with the groove. The rotor wall and the rotor base are separate components. The rotor wall and the rotor base are arranged relative to each other so that the fiber sliding surface leads to the groove. By forming the rotor wall with the fiber sliding surface as a separate component that can be presented separately from the rotor base so as to be connected to the rotor base comprising the groove, the characteristics of the two functional surfaces (fiber sliding surface and groove) can be selected for a specific application so that the characteristics are specifically adapted to the requirements for the application.

[0012] The groove here refers to the fiber collection groove. Fiber rings are formed in the fiber collection groove during the spinning operation. The groove is a recessed portion extending along the inner circumference of the rotor. Therefore, the groove is defined on both sides of the groove base, or includes two lateral boundaries. According to the present invention, the rotor base is formed integrally with the groove, in particular with the entire groove. Therefore, the rotor base is also formed integrally with the two lateral boundaries of the groove. Therefore, the two lateral boundaries of the groove are also integral or the groove itself is a single piece.

[0013] In the rotor spinning process, a complete dissolution of the fiber strip and in particular complete separation of the fibers transported therein are particularly provided, in particular further stretching the fibers and spinning the fibers into yarns via the fiber ring. This allows the fibers to move along the fiber sliding surface in the direction toward the groove in the rotor. In particular, the fibers have been isolated or slide down the fiber sliding surface as separate fibers. Compared with the groove, the stress on the fiber sliding surface is significantly lower. In one embodiment, it may be advantageous if the fiber sliding surface is formed as less wear-resistant than the rotor base comprising the groove.

[0014] For the fiber sliding surface, for example, it can be arranged that its surface is formed to be rougher than the surface of the groove. In particular, the rougher surface of the fiber sliding surface generates friction, which can slow down the fiber when the fiber slides. Therefore, the stretching of the fiber can be increased. This is particularly due to the fact that the force experienced by one end of the fiber arranged closer to the input opening of the rotor during sliding is different from the force experienced by the other end of the fiber arranged axially more inward during sliding. This makes it possible to influence the roughness of the surface, in particular the tensile properties of the fiber of the yarn. In particular, the selection of the surface is not intended to increase friction so that the rotor acts as a centrifuge to a large extent, that is, the fiber no longer slides axially inwardly toward the groove in the rotor via the surface within a time suitable for the spinning process.

[0015] As far as the groove is concerned, it can be provided in particular that it is formed particularly smooth. Alternatively, it can be provided that the groove has a roughness that supports the relative twisting of the fiber ring that can be formed therein and the (shaped) yarn in the extraction part from the rotor that is particularly centrally arranged. Thus, the strength of the yarn can be influenced.

[0016] The requirements placed on the two functional surfaces are therefore different from one another. The described construction of the rotor as a hybrid rotor consisting of at least two components, a rotor wall with a fiber sliding surface and a rotor base with grooves, thus makes it possible to adjust the properties of the two functional surfaces to the planned application or the planned use, for example in the case of other fibers and / or fiber mixtures to be spun. This adjustment can be achieved with regard to the surface of these functional surfaces (depending on the preselection of the components with the corresponding functional surfaces) and with regard to their geometry.

[0017] For example, the inclination angle of the fiber sliding surface can be adjusted with respect to the axis of rotation. The fiber sliding surface extends in particular so that the rotor wall widens axially inwards (i.e. in the assembled state towards the groove, in particular away from the opening of the component that can include or form the rotor wall), and therefore has its widest area in particular in the transition area from the fiber sliding surface to the groove. Straight lines that can be arranged axially outwards conceptually form a cone intersection that can be defined by the inclination angle relative to the (protrusion of) the axis. This can be modified in various embodiments in order to influence the sliding properties of the fiber.

[0018] This groove can be formed as undercut so that the recessed portion is formed as the groove around this rotor. Especially, this can point radially outward. This shape is particularly easy to produce and therefore saves costs. Friction can have an adverse effect on the fiber annulus pressed outward by rotation (centrifugal force). Alternatively, this groove can include a circular portion, which can simulate the fiber annulus in possible external diameter. Therefore, corresponding friction can act on this fiber annulus more evenly.

[0019] In this regard, it is particularly provided that the groove can exist as a part of the rotor base. The fiber ring can extend on the rotor base, in particular from the groove outwardly toward the extraction portion. Alternatively or additionally, it can be provided that the rotor base (mostly) is formed as a disk body. Alternatively or additionally, the rotor base can be formed as a plate. The assembly that can form the rotor base can include an edge in the radial direction, which can be arranged higher (or correspondingly lower) or defined in a horizontal arrangement manner, such as the central area (central surface) of the plate. In particular, the recessed portion can be arranged in the central arrangement area of ​​the plate (or correspondingly also in the disk) as described elsewhere, so that the retaining component can be arranged. The disk and / or plate should be implemented in a resource-saving manner. In particular, the integral formation of the functional surface of the rotor base and the groove or formed by the same material can increase the stability of the groove. This is particularly suitable for such an apparatus, with which the groove can be arranged on a ring assembly (also referred to as a ring element or ring). These ring assemblies are more susceptible to fracture, particularly in embodiments with ceramic or other materials that are more brittle than metals, metal alloys or coated metals, for example compared to a disc- and / or plate-shaped rotor base. In particular, the rotor base serves as structural support for the groove, but still allows for separate formation from the rotor wall and the fiber sliding surface.

[0020] According to one aspect, the rotor wall can be arranged to be inserted into the rotor base. Thus, the rotor wall can be at least partially surrounded by the rotor base (in the assembled state), in particular in the direction of rotation about the rotation axis. Alternatively, the rotor base can be inserted into the rotor wall. Thus, the rotor base can at least partially surround the rotor wall, in particular in the direction of rotation about the rotation axis. Thus, a connection can be formed which is (dimensionally) stable at high rotation speeds of the rotor and in particular has low balance or even no imbalance.

[0021] According to one aspect, the holding part can be arranged so as to rotatably support the rotor. Thus, the combination of the above-mentioned components with the functional surface provided for the rotor spinning process can be supported by another component. In particular, this can be used as an adapter to enable the various configurations of the combination of rotor wall and rotor base described elsewhere to be connected to the rotor spinning machine. The choice of material and / or geometry can also be adapted to the connection so as to enable rotation with as little wear as possible.

[0022] According to one aspect, the holding component can be formed so as to be arranged so as to receive an area of ​​the rotor base. In particular, the area can be located on a side of the rotor base that is arranged to face away from the rotor wall, in particular on a side facing away from the inner area of ​​the rotor. Here and elsewhere, the inner area of ​​the rotor can be an area that may come into contact with the fibers and / or may come into contact with the shaped yarn in the event of sliding. Thus, the rotor base can be in direct contact at least partially. It can also be provided that the rotor base is received by the holding component, in particular over a large part of the entire base surface facing away from the rotor (inner) base. Thus, the holding assembly can support the rotor base particularly evenly.

[0023] Alternatively, the retaining member may be formed so as to be arranged so as to contact an area of ​​the rotor base and an area of ​​the rotor wall. The area (or a portion thereof) may be particularly arranged on a side of the rotor base facing away from the rotor wall. Alternatively or additionally, the area (or a portion of the area) may be arranged on a side of the rotor wall away from the rotor base, in particular on a side facing outward, in particular on the outer side of the rotor. The area in contact with the rotor wall may be particularly a radially outer area, which may be received in particular by a portion of the retaining member. Therefore, the rotor wall may also be supported by the retaining member, and the connection between the components may be strengthened.

[0024] According to one aspect, at least one of the rotor base or the fiber sliding surface may comprise at least one material selected from the group consisting of ceramic, polymer, polymer composite, fiber reinforced plastic material, metal, steel, aluminum, borided metal, borided steel, borided aluminum, diamond coated material, diamond coated metal, diamond coated steel, diamond coated aluminum or nickel plated metal, nickel plated steel or nickel plated aluminum. Thus, different requirements related to the two functional surfaces may be accommodated as described elsewhere, in particular by combining different materials for the rotor wall and rotor base.

[0025] However, a rotor base with an integral groove composed of ceramic is particularly preferred. The ceramic ensures good wear protection of the groove, and the integral formation with the rotor base ensures reliable stability of the otherwise relatively fragile ceramic, as already described elsewhere.

[0026] If possible, the ceramic should be subjected only to compressive stresses and not to tensile stresses. A retaining component which receives the region of the rotor base or receives the region of the rotor base and the region of the rotor wall as described elsewhere is particularly suitable in combination with a rotor base made of ceramic, since the rotor wall is subjected only to compressive pressures and tensile stresses are avoided. In contrast, a retaining component which is arranged in a recess in the rotor base is suitable for a rotor base made of metal.

[0027] According to one embodiment, the rotor can be formed as a hybrid rotor. A ceramic hybrid rotor can be provided. The rotor base with integrated grooves is particularly formed as a closed base body, and the fiber sliding surface of the rotor wall and the shaft can then be pressed onto the base body as a rotating device (or as a holding component). In particular, the rotor wall and the holding component each comprise a rotor base, which is particularly formed as a ceramic component, so that in particular only compressive stresses act on the ceramic.

[0028] According to one embodiment, the rotor base with integrated grooves can consist of steel, which can be hardened and coated (e.g., boronized). The fiber sliding surface can be made of steel or aluminum and can be coated, for example, with diamond. However, it no longer needs to be boronized. This is not absolutely necessary for the fiber sliding surface. Borization is carried out in particular at such high temperatures that stresses can be relieved, which can lead to distortions, in particular for thin-walled components.

[0029] In an embodiment, the groove or the rotor base may be formed so as to be primarily protected from wear. The groove or the rotor base / the groove and the rotor base may comprise a suitable surface quality, which may be determined by the choice of material. In an embodiment, for example, a coating with diamond may be provided.

[0030] The fiber sliding surface can be formed so as to allow the fiber to optimally slide into the groove. This can result in a surface quality that does not necessarily correspond to the surface quality of the groove. Alternatively, the fiber sliding surface can include or consist of a fiber reinforced plastic material. Further alternatively, the fiber sliding surface can include or consist of a high-strength material that can withstand strength requirements under operating conditions, particularly at 150,000 rpm, further particularly for 1,000 hours of application, further particularly for 5,000 hours of application, further particularly for 10,000 hours of application. In an embodiment, a coating with diamond can be particularly provided so that a correspondingly hard material can be formed.

[0031] According to one aspect, at least two of the components selected from the rotor wall, the rotor base and the retaining component can be formed so as to be connectable to each other. In particular, the connection is selected from a pressing, a threaded engagement, a bonding or a welding operation. Alternatively or additionally, at least two of the components can be connected to each other via a magnetic interaction. On the one hand, if the rotor is not (or no longer) intended to be disassembled later, for example to replace components, a fixed, irreversible connection can therefore be formed. Alternatively, a fixed connection that can be separated again can be formed. This can be achieved so that the rotor can be subsequently disassembled again, for example for removing, replacing and / or recycling the designated individual components.

[0032] According to one aspect, an ear, which is arranged in particular on the rotor wall, can be formed in the assembled state at the transition from the fiber sliding surface to the groove in the direction away from an opening, in particular an inlet opening, of the rotor wall. Thus, a fiber blockage at the transition from the fiber sliding surface to the groove, which can have a negative impact on the rotor spinning process, can be prevented. The ear preferably covers the transition from the fiber sliding surface to the groove.

[0033] An ear is understood in particular to mean that the fiber sliding wall merges into a region arranged radially further outwards, so that a region can be produced which cannot be contacted by the fiber in the transition to the groove. In other words, this means that there can be a region of the groove arranged axially (with respect to the course and / or symmetry of the axis of rotation) above (i.e. in the direction of the inlet opening of the rotor) and in particular radially further outwards, which protrudes from the ear. The fiber thus slides directly from the ear tip into the groove, so that the fiber ring is produced there and does not adhere to the rotor.

[0034] In particular, the ear tip is the point or region of the ear which is furthest from the opening in the rotor wall in the assembled state in one direction.

[0035] According to one aspect, it can be provided that the ear protrudes into the groove by 0.01 mm to 0.5 mm. Alternatively, it can be provided that the ear protrudes into the groove by 0.1 mm to 0.4 mm. Alternatively, it can be provided that the ear protrudes into the groove by 0.2 mm to 0.3 mm. Alternatively, it can be provided that the ear protrudes into the groove (as precisely as possible) by 0.25 mm. Thus, the ear can also be geometrically adapted to the fiber to be used or the fiber mixture to be used in the rotor spinning process.

[0036] The protrusion is particularly understood to mean a measurement made in a direction parallel to the axis of symmetry and / or the axis of rotation from a point or region of the groove arranged above the tip of the lug (in a section along the axis of rotation). In other words, the point or region where the measurement is made may be the point from which the lug is exposed to the tip of the lug.

[0037] According to one aspect, the distance in the radial direction between the transition point of the fiber sliding surface and the radially outermost point of the groove may be between 0.5 mm and 1.5 mm. Alternatively, the distance in the radial direction between the transition point of the fiber sliding surface and the radially outermost point of the groove may be between 0.6 mm and 1.3 mm. Alternatively, the distance in the radial direction between the transition point of the fiber sliding surface and the radially outermost point of the groove may be between 0.65 mm and 1.27 mm. Alternatively, the distance in the radial direction between the transition point of the fiber sliding surface and the radially outermost point of the groove may be 0.7 mm. Alternatively, the distance in the radial direction between the transition point of the fiber sliding surface and the radially outermost point of the groove may be (as accurately as possible) 0.76 mm. Alternatively, the distance in the radial direction between the transition point of the fiber sliding surface and the radially outermost point of the groove may be (as accurately as possible) 1.26 mm. Thus, for example when using specific fibers and / or specific fiber mixtures, the transition area between the ear and the groove, and alternatively or additionally the shape and size of the groove, can be adapted to the rotor spinning process to be carried out. Alternatively or additionally, the throughput can be influenced thereby. Alternatively or additionally, the thickness of the yarn to be produced can also be influenced thereby.

[0038] According to one aspect, the fiber sliding surface may comprise a structured portion. In particular, the structured portion may be selected from a dotted structure, a wavy structure, a structure with partial longitudinal grooves or a structure with transverse grooves. A hybrid form may also be provided. In particular, the structured portion is formed and arranged to influence the sliding properties of the fiber on the fiber sliding wall in addition to the choice of material or any microstructure. In particular, the structured portion may be used to extend the length of the fiber sliding and therefore in particular the time required for the fiber to slide down the fiber sliding wall. As already described elsewhere, this has an influence on the degree of stretching of the individual fibers and therefore on the yarn to be spun.

[0039] According to an independent aspect, this object is achieved in particular by a textile machine comprising a rotor as described elsewhere.

[0040] The textile machine is particularly a rotor spinning machine, further particularly a free-end rotor spinning machine. The textile machine can be described by the features, functions and advantages described elsewhere, because these features, functions and advantages are realized with respect to the rotor. The description of various aspects can also be realized across category boundaries-devices, systems, methods and uses. In this regard, reference can be made to the features, functions and advantages of the rotor listed elsewhere in order to describe the textile machine, the method for forming the rotor or the use of the rotor and / or the textile machine. This also applies in reverse. Therefore, the rotor can be described by the features, functions and advantages of the textile machine, the method for forming the rotor or the use of the rotor and / or the textile machine. For reasons of readability and compactness, it is avoided to repeat all features, functions and advantages and possible combinations that are conceivable and therefore possible in this regard.

[0041] According to an independent aspect, the object is achieved by a method for forming a rotor as described elsewhere. The method comprises the step of providing a rotor wall. The method comprises the step of providing a rotor base. The method comprises the step of connecting the rotor wall to the rotor base.

[0042] The method can be described by the features, functions and advantages described elsewhere, because these features, functions and advantages are implemented with respect to the rotor or the textile machine. The description of various aspects can also be implemented across category boundaries-devices, systems, methods and uses. In this regard, reference can be made to the features, functions and advantages of the rotor or the textile machine listed elsewhere in order to describe the method for forming the rotor or the uses of the rotor and / or the textile machine. This also applies in reverse. Therefore, the method for forming the rotor can be described by the features, functions and advantages of the textile machine, the rotor or the uses of the rotor and / or the textile machine. For reasons of readability and compactness, it is avoided to repeat all features, functions and advantages and possible possible combinations that are conceivable and therefore possible in this regard.

[0043] According to an independent aspect, the object is achieved in particular by the use of the rotor. The rotor can be formed as described elsewhere. Alternatively or additionally, a textile machine can be used as described elsewhere. The textile machine can comprise a rotor as described elsewhere.

[0044] The use can be described by the features, functions and advantages described elsewhere, because these features, functions and advantages are implemented with respect to the rotor or the textile machine and / or the method. The description of various aspects can also be implemented across category boundaries-devices, systems, methods and uses. In this regard, reference can be made to the features, functions and advantages of the rotor or textile machine and / or the features, functions and advantages of the method listed elsewhere in order to describe the use of the rotor. This also applies in reverse. Therefore, the method for forming a rotor, the textile machine and / or the rotor can be described by the features, functions and advantages of the use of the rotor and / or the textile machine. For reasons of readability and compactness, it is avoided to repeat all features, functions and advantages and possible possible combinations that are conceivable and therefore possible in this regard.

[0045] In other words, in one embodiment, the rotor can be particularly formed as a hybrid rotor. The rotor base can be formed as a disc-shaped or plate-shaped rotor base with an integral groove. The rotor base with an integral groove can be composed of steel, which can be hardened and coated (e.g., boronized). In particular, the shaft around which the rotary motion can be conveyed is pressed into the rotor base. The rotor wall that can have the fiber sliding surface can be pressed from the outside or pressed from the inside. Other connections are also possible, such as threaded engagement, gluing or welding. Magnetic mounting is also possible. The fiber sliding surface can be made of steel or aluminum and can be coated, for example, with diamond. However, it no longer needs to be boronized. This is not absolutely necessary for the fiber sliding surface. Boronization is particularly carried out at such a high temperature that stress can be released, which can cause distortion, particularly for thin-walled components. This situation can be avoided by the exemplary embodiment described herein. At the transition from the fiber sliding surface to the groove, the fiber sliding surface is particularly protruding relative to the groove so that fiber clogging does not occur.

[0046] The functional surfaces of the groove and the fiber sliding surface, which are important for yarn production, are particularly assigned to two different components, which may include adjusted surfaces for corresponding different functions. The groove can be formed to be mainly protected from wear. By appropriate material selection, it can be given a suitable surface finish. The fiber sliding surface can be formed so as to allow the fiber to slide optimally into the groove. This can result in a surface quality that does not necessarily correspond to the surface quality of the groove.

[0047] In particular, by dividing the rotor into two components, the functional surfaces of the groove and the fiber sliding surface can be structurally separated from one another and can therefore also be installed or selected for forming the rotor separately from one another during the rotor assembly process. This makes it possible to treat the two functional surfaces separately. This opens up new possibilities for influencing the yarn that cannot be achieved in one-piece production.

[0048] At the transition from the fiber sliding surface to the groove, in particular in the assembled state, an ear can be formed in a direction facing away from the opening in the rotor wall. By varying the protruding ear on the fiber sliding surface in the transition region to the groove, the production of the yarn can be influenced, which can lead to possible yarn modifications. For example, the length of the ear can be varied and / or the clearance to the rotor base can be reduced or increased.

[0049] According to one embodiment, the rotor can be formed as a hybrid rotor. A ceramic hybrid rotor can be provided. In such a rotor, the rotor base can be formed as a rotor base with an integrated groove made of ceramic. The rotor base with an integrated groove is particularly formed as a closed base body, and the fiber sliding surface of the rotor wall and the shaft can then be pressed onto the base body as a rotating device (or as a holding part). In particular, the rotor wall and the holding part each include a rotor base, which is particularly formed as a ceramic component, so that in particular only compressive stresses act on the ceramic. In the case of ceramics, tensile stresses should be avoided as much as possible.

[0050] At the transition from the fiber sliding surface to the groove, the fiber sliding surface can in particular protrude relative to the groove so that no fiber clogging occurs.

[0051] The rotor base and the rotor groove, which are formed as a ceramic component and in particular as a disc-shaped and / or plate-shaped rotor base, can be formed in one piece. This can be gripped from the outside. The ceramic component, which can be the rotor base, can be formed as a disc. In particular, no ring component is formed, so that greater stability can be obtained, which reduces the possibility of fracture of the groove (or the component to which it is assigned).

[0052] The functional surfaces of the groove and the fiber sliding surface that are important for yarn production can be assigned in particular to two different components. Thus, the surfaces that are important for the respective different functions can be optimized for use, for example, in a spinning process for a specific fiber type or a specific fiber mixture. The groove can be primarily protected from wear and in this respect have a suitable surface quality (or be assigned a suitable surface quality in the method for forming a rotor), and the fiber sliding surface can be primarily optimized for sliding the fiber into the groove and in this respect have an optimized surface quality (or be assigned a suitable surface quality in the method for forming a rotor). In particular, the surface quality of the fiber sliding surface may not correspond to the surface quality of the groove.

[0053] In these embodiments, the rotor wall with the fiber sliding surface can be pressed into the rotor base. In particular, the connection can be formed to be gap-free and / or detachable, in particular via threads or small magnets.

[0054] In an embodiment, the fiber sliding surface may be made of steel or aluminum. Alternatively, the fiber sliding surface may include or consist of a fiber reinforced plastic material. Further alternatively, the fiber sliding surface may include or consist of a high-strength material that can withstand strength requirements in operating conditions, in particular at 150,000 rpm (i.e., "revolutions per minute"), further in particular for 1,000 hours of application, further in particular for 5,000 hours of application, further in particular for 10,000 hours of application. In an embodiment, a coating with diamond may be particularly provided so that a correspondingly hard material can be formed.

[0055] In the following, exemplary embodiments of the invention are described in more detail with reference to the accompanying drawings, which show schematically and by way of example:

[0056] Figure 1 is an overview and detailed representation of one embodiment of a rotor;

[0057] Figure 2A is an overview of one embodiment of a rotor;

[0058] Figure 2B is based on Figure 2A A detailed representation of one embodiment of a rotor;

[0059] Figure 3A is an overview of one embodiment of a rotor;

[0060] Figure 3B is based on Figure 3A A detailed representation of one embodiment of a rotor;

[0061] Figure 4A is an overview of one embodiment of a rotor;

[0062] Figure 4B is based on Figure 4A A detailed representation of one embodiment of a rotor;

[0063] Figure 5A is an overview of one embodiment of a rotor;

[0064] Figure 5B is based on Figure 5A A detailed representation of one embodiment of a rotor;

[0065] Fig. 6A is a representation of the structured portion of the fiber sliding surface;

[0066] Figure 6B is a representation of the structured portion of the fiber sliding surface;

[0067] Figure 6C is a representation of the structured portion of the fiber sliding surface;

[0068] Fig.6D is a representation of the structured portion of the fiber sliding surface; and

[0069] Figure 7 is a representation of an embodiment of the method and use;

[0070] Figure 8 is a representation of the structured portion of the fiber sliding surface;

[0071] Fig. 9 is a representation of the structured portion of the fiber sliding surface;

[0072] Fig.10 It is a representation of the structured portion of the fiber sliding surface.

[0073] The same reference numerals are used for elements and structures having the same function and / or of the same type. Some points are mentioned here and elsewhere in particular, because the figures are described with respect to a plane section through the axis of rotation 20. In a three-dimensional description, there are areas and / or surfaces, or in particular two-dimensional objects such as rings. In this context, if a single point is meant, an area, a surface or such (mathematical) object in Euclidean space may also be meant.

[0074] Figure 1 An overview of an embodiment of a rotor 10 and a detailed representation A of the rotor in the region of the groove 4 are shown. In particular, the rotor 10 comprises a retaining part 2 which is pressed into a hole 21 of the rotor base 1. In particular, the retaining part 2 has a hexagonal bolt 7 which is arranged to be able to connect the rotor 10 to a textile machine (not shown), as described in connection with Figure 7 As described with respect to method 100 or use 150 .

[0075] For the use 150 in a rotor spinning process, the functional surface 6 of the groove 4 and the fiber sliding surface 9 is particularly important. In particular, the fiber sliding surface 9 is assigned to the rotor wall 3, wherein the groove 4 is assigned to the rotor base 1. The rotor base 1 forms a component, which is particularly formed in one piece with the groove 4. The groove 4 is particularly formed as an undercut, which can form an outer edge in the axial direction, with which contact with the rotor wall 3 can be achieved. Here and elsewhere, the axial direction is understood to be a direction that at least includes a directional component parallel to the axis of symmetry and / or the axis of rotation of the rotor (in the assembled state).

[0076] In particular, in the rotor spinning process, the groove 4 serves to guide a fiber loop (not shown), which can be formed by individual fibers moving axially inwards on the fiber sliding surface 9 (i.e. from the inlet opening 11 of the rotor wall 3 along the fiber sliding direction of the fiber sliding surface 9) and finally into the groove 4. In particular, the fiber loop is then also at least partially guided on the bottom 14 of the rotor base in order to join with the yarn (not shown) drawn out and formed in the process, in particular in the (central) draw-off section (not shown), into the yarn drawn out and thus formed.

[0077] In particular, the fiber sliding surface 9 is inclined such that the conical cross section (in the plane cross section shown here along the rotation axis 20) widens from the inlet opening 11 along the rotation axis 20 inwardly toward the rotor base 1, in particular such that the conical cross section of the rotor wall 3 has a maximum (inner) diameter at the transition from the fiber sliding surface 9 to the groove 4. In embodiments such as those shown in FIGS. 2, 3 and 5, an ear 8 can be formed at the transition from the fiber sliding surface 9 to the groove 4, which ear is formed and arranged so that fiber clogging (not shown) at the transition of sliding fibers (not shown) from the fiber sliding surface 9 to the groove 4 is avoided. In particular, the ear 8 includes a position that can be referred to as the ear tip 23. This is in particular a point or in particular an area which, in the case of the rotor being assembled, is arranged at the greatest axial distance inside the rotor, i.e. away from the inlet opening 11 of the rotor wall 3, in particular parallel to the rotation axis and / or the axis of symmetry. In particular, the inner area of ​​the rotor 10 is the area where the fibers can come into contact with the rotor 10 or its functional surface 6. Alternatively or additionally, the ear tip 23 can also be a point or region of the ear 8 at which the conical cross section has the largest diameter and / or with which the fiber last comes into contact with the fiber sliding surface 9 during sliding. In particular, the ear tip 23 can be a point or region of the ear 8 at which the fiber loses contact with the fiber sliding surface 9 during sliding. In particular, the groove 4 comprises a lowest point 15. In particular, the lowest point is a point perpendicular to the plane of the rotation axis 20, which has the greatest distance from the inlet opening 11, but is still part of the groove 4. Thus, the groove 4 is delimited at the bottom in particular by a plurality of points 15. The point 15 (or region) can be the maximum radially outer point 5. The two points 5 and 15 can coincide in an embodiment, but can also be different points 5, 15.

[0078] In particular, as described in relation to Figures 2, 3 and 5 below, the distance between the maximum radially outer point 5 of the groove 4 and the ear tip 23 can be varied between different rotor bases 1 to be able to influence the yarn as described elsewhere. Alternatively or additionally, the distance between the maximum axial spacing point 15 from the inlet opening 11 and the ear tip 23 can be varied between different rotor bases 1 to be able to influence the yarn as described elsewhere.

[0079] Fig. 4 shows an exemplary transition between the fiber sliding surface 9 and the groove 4 without the ear 8. The above description relates to the point 29 rather than the ear tip 23 at which the fiber leaves the fiber sliding surface 9, ie in particular loses contact with it.

[0080] Figure 1 An exemplary embodiment is shown, in which the holding part 2 is pressed into the hole 21 of the rotor base 1. It is also shown that the rotor wall 3 can be pressed into the rotor base 1. For this purpose, the rotor base 1 and the rotor wall 3 each comprise corresponding contact surfaces 25, 26. In particular, these contact surfaces 25, 26 are parallel to the rotation axis 20. In particular, the diameter of the inlet opening 11 is 22.5 mm.

[0081] In the following description, we will discuss in particular Figure 1 The differences between the exemplary embodiments shown and described above.

[0082] Figure 2A An overview of an exemplary embodiment of a rotor 10 is shown. Figure 2B Shown according to Figure 2A Detailed representation of an embodiment of a rotor 10 of A. In particular, the distance between point 5 and the tip 23 of the ear is 0.84 mm. In particular, the distance between point 15 and the tip 23 of the ear is 0.85 mm. In other embodiments, the above dimensions may be approximately the same. The gap 13 may be formed between a surface formed radially on the outside of the ear 8 and the region of the groove 4. The surface may be parallel to the axis of rotation 20. This shows how the groove 4 approaches the tip 23 of the ear in an arc shape, wherein the diameter of the rotor base 1 decreases in particular (again) in the direction of the inlet opening 11 of the rotor wall 3. As an alternative to the arc shape (in the cross-sectional view), a straight line (in the cross-sectional view) may also be provided. In other embodiments, it can be provided that the ear 8 protrudes particularly from the groove 4, wherein the groove 4 no longer tapers further in the direction of the inlet opening 11 of the rotor wall 3 or tapers only to a certain diameter of the rotor base. The wall can also extend largely parallel to the rotation axis 20, the wall being projected by the ear tip 23, in particular the ear tip 23 resting on the wall, further in particular without the gap 13. This also applies correspondingly to Figure 1 and other embodiments shown in FIGS. 3 to 5 .

[0083] There may be embodiments in which the distance between the point 5 and the tip 23 of the ear is, in particular and also as precisely as possible, 1.29 mm. The above distance can be formed regardless of whether the ear 8 at least partially protrudes from the groove 4 or whether a second groove surface (not shown) is arranged in the groove 4, which, as described elsewhere, has a radius that is smaller than the radius of the groove 4 at the point 5 (in particular at each point). This therefore applies to the diameter, since there is a rotational symmetry about the axis of rotation 20. In other words, the groove 4 can therefore not only include a profile, in particular a curved profile, but also a more complex profile, with which, for example, the curved profile can be connected to a surface axially closer to the inlet opening 11, which surface can receive fibers from the fiber sliding surface 9, in particular also via the ear 8. It can be provided that instead of achieving a complete transition to the maximum radius as at the point 5, a slightly increasing radius of the groove 4 is achieved axially in the direction of the point 5.

[0084] In particular, in an embodiment, the ear 8 may protrude 0.01 mm to 0.5 mm into the groove 4. Alternatively, the ear 8 may protrude 0.1 mm to 0.4 mm into the groove 4. Alternatively, the ear 8 may protrude 0.2 mm to 0.3 mm into the groove 4 or 0.25 mm into the groove 4. An exemplary embodiment comprises an ear 8, which is in particular 0.5 mm measured in the axial direction in the region of the groove 4 from the contact surface 27 of the rotor wall 3 and the rotor base 1. In particular, an edge arranged axially closer to the inlet opening 11 may be arranged on the rotor base 1, which edge may delimit the groove 4 on the outside in the direction of the inlet opening 11 of the rotor wall 3, wherein the height of the edge is in particular 0.25 mm. Thus, the ear 8 may protrude 0.25 mm into the groove 4. In particular, the edge is at least partially in contact with the contact surface 27.

[0085] In an embodiment, the distance in the radial direction between the transition point of the fiber sliding surface 9 as point 29 (see FIG. 4 ) or as ear tip 23 and the radially outermost point 5 of the groove 4 may be between 0.5 mm and 1.5 mm. Alternatively, the distance may be between 0.6 mm and 1.3 mm, in particular between 0.65 mm and 1.27 mm, even further in particular and as precisely as possible 0.7 mm, or as precisely as possible 0.76 mm or as precisely as possible 1.26 mm.

[0086] exist Figure 2AIn the exemplary embodiment of the rotor 10 shown in FIG. 1 , the rotor wall 3 protrudes in a flange-like manner in the radially outer contact region 12 beyond the rotor base 1. In particular, the contact surfaces 25, 26 are in contact there, in order to establish a connection between the rotor base 1 and the rotor wall 3. The rotor wall 3 protrudes beyond the rotor base 1 in the contact region, so that on the side of the groove 4 that is closer to the inlet opening 11 of the rotor wall 3, the gripping portion extends to the ear 8, so that a transition region between the fiber sliding surface 9 and the groove 4 can be formed.

[0087] Figure 3A An overview of an exemplary embodiment of a rotor 10 is shown. Figure 3B Shown according to Figure 3A A is a detailed representation of an embodiment of the rotor 10 . Figure 3A and Figure 3B The difference of the exemplary embodiment of 1 is in particular the configuration of the contact area 16 with the contact surfaces 25, 26. In contrast to the contact area 12, in the embodiment shown, the rotor wall 3 does not protrude from the rotor base 1, but the rotor base 1 is formed to protrude radially outwards from the rotor wall 3 in a flange-like manner in the contact area 16. The rotor wall 3 is therefore in particular pressed into the rotor base 1. However, this makes it possible to configure the transition between the fiber sliding surface 9 and the groove 4 accordingly, as described with regard to Figure 2B In particular, the distance between point 5 or point 15 and the tip 23 of the ear corresponds to Figure 2B The representation described in .

[0088] In alternative embodiments, the distance in the radial direction between the transition point of the fiber sliding surface 9 as point 29 (see FIG. 4 ) or as ear tip 23 and the radially outermost point 5 of the groove 4 can also be different, in particular independently of the contact areas 12, 16. The contact areas 12, 16 can therefore be formed accordingly, so that the desired distance between the point 5 or point 15 and the ear tip 23 described elsewhere can be formed accordingly by the combination of the rotor wall 3 and the rotor base 1.

[0089] It is also possible that the inlet opening 11 is smaller than the Figure 1 In particular, the diameter of the inlet opening 11 can be as precisely as possible 21.5 mm. Thus, the inclination angle of the fiber sliding surface 9 can be formed by a corresponding predetermined reception of the rotor base 1 .

[0090] Figure 4A An overview of an exemplary embodiment of a rotor 10 is shown. Figure 4B Shown according to Figure 4ADetailed representation A of an embodiment of a rotor 10 . In particular, the rotor base 1 is formed from ceramic. No ears 8 are provided here. It should be noted at this point that ears 8 can also be provided in the case where the rotor base 1 is formed from ceramic. This shows that the point 29 can have the function of the ear tip 23 as described elsewhere. For example, it is shown here that a contact area 12 can be formed, which in particular contacts the contact surface 25 of the rotor wall 3 from the radial inside. However, in particular, it is provided that the rotor base 1 does not contact the contact surface 25 of the rotor wall 3 in a positively locked manner over the entire contact area 12, but that a partial gap 24 is present. Therefore, only the contact area 28 of the rotor base 1 made of ceramic will contact the contact surface 25 of the rotor wall 3. Therefore, stresses in the rotor base 1 can be offset and further protection of the rotor base 1 made of ceramic can be provided.

[0091] Another exemplary difference compared to other embodiments is shown in the region of the holding part 2, which can however be transferred to these embodiments. For example, pure bolts, i.e. non-hexagonal bolts, are used here to arrange the rotor 10 in the textile machine. The hole groove 18 can also be used for locking. In addition, the holding part 2 is not pressed into the hole 21 here, but the rotor base 1 is connected to the receiving area 22, which can receive a part of the rotor base 1 in a flange-like manner and in particular protrude from this part. This difference can also be transferred to other embodiments.

[0092] Figure 5A An overview of an exemplary embodiment of a rotor 10 is shown. Figure 5B Shown according to Figure 5A Detailed representation of an embodiment of a rotor 10 of A. In contrast to other transferable embodiments, the retaining part 2 is formed as a flange-like structure 30, so that it contacts the contact surface 25 of the rotor wall 3 via a contact surface 31 of the retaining part 2 in the radially outer region. The rotor wall 3 is thus received in the flange-like structure 30 of the retaining part 2, just like the rotor base 1. In particular, the rotor base 1 is also contacted via a surface which is arranged at an axial distance away from the inlet opening 11 relative to the rotor base 1. A further stabilization of the rotor base 1 can thus be achieved. In particular, the rotor base 1, which is also formed from ceramic in this case, comprises recesses 24 at some locations in relation to the flange-like structure 30, so that non-positively locking contact areas 28 can be formed, in particular in order to be able to compensate for stresses in the ceramic.

[0093] Regarding the choice of materials, the rotor base 1 may include at least one material selected from the following: ceramics, polymers, polymer composites, fiber-reinforced plastic materials, metals, steel, aluminum, borided metals, borided steel, borided aluminum, diamond-coated materials, diamond-coated metals, diamond-coated steels, diamond-coated aluminum or nickel-plated metals, nickel-plated steels or nickel-plated aluminum.

[0094] Alternatively or additionally, with regard to the choice of material, the fiber sliding surface 9 may include at least one material selected from the group consisting of: ceramics, polymers, polymer composites, fiber reinforced plastic materials, metals, steel, aluminum, boronized metals, boronized steel, diamond-coated materials, diamond-coated metals, diamond-coated steels, diamond-coated aluminum or nickel-plated metals, nickel-plated steels or nickel-plated aluminum.

[0095] exist Figure 1 The exemplary embodiment shown in FIG. 5 is characterized in particular in that, in addition to a large degree of freedom in the choice of geometry, a large degree of freedom in the choice of materials is also possible. Thus, the materials described and the various geometries described can be combined with one another.

[0096] Fig. 6A An exemplary representation of a structuring 50 of a fiber sliding surface 9 is shown. In particular, a dot structure 52 is formed here, with which the dots are arranged relative to one another so as to cover the fiber sliding surface 9. In particular, 576 such dots are arranged relative to one another, in particular 48 dots per revolution, in particular arranged in 12 rows, wherein the arrangement of the dots can be offset relative to one another in the axial direction on the fiber sliding surface 9. In particular, the diameter of the dots is as precisely as possible 0.62 mm and the depth is as precisely as possible 0.05 mm.

[0097] Figure 6B An exemplary and schematic representation of a structured portion 50 of a fiber sliding surface 9 is shown. In particular, a wave-like structure 54 is formed, which is arranged to emboss a wave-like profile in the axial direction on the fiber sliding surface 9. In particular, it can be provided that the height of the wave-like profile from wave crest to wave trough is as precisely as possible 0.03 mm. In particular, the double wavelength is as precisely as possible 0.49 mm.

[0098] Figure 6C An exemplary and schematic representation of a structured portion 50 of a fiber sliding surface 9 is shown. Partial longitudinal grooves 56 are provided as the structured portion 50. In particular, the width of these partial longitudinal grooves in the axial direction through the fiber sliding surface 9 is as precisely as possible 0.4 mm. These partial longitudinal grooves are arranged at an angular distance of 60° in the direction of rotation, in particular, 6 partial longitudinal grooves are arranged in each case in a circular arc segment. Alternatively, twice as many partial longitudinal grooves can be arranged at half the angular distance. In particular, the partial longitudinal grooves 56 are not offset from each other in the axial direction, for example in the case of a point structure 52.

[0099] Fig.6DAn exemplary and schematic representation of a structured portion 50 of a fiber sliding surface 9 is shown. In particular, transverse grooves 58 arranged in the axial direction along the fiber sliding surface 9 are shown here. In particular, the width of these transverse grooves in the rotational direction can be 0.65 mm. In particular, 48 such transverse grooves can be arranged, i.e., in particular at an angular distance of 7.5°.

[0100] With regard to FIG. 6 , for reasons of simplified representation, the perspective effects of the representation are only partially or not taken into account.

[0101] Figure 8 Another structuring of the fiber sliding surface 9 is shown. In particular, transverse grooves of different lengths are shown here. These transverse grooves can extend from the rotor base to the rotor opening or be spaced apart from the rotor base and / or the rotor opening. The length of these transverse grooves can preferably be between 2.8 mm and 6.8 mm.

[0102] Fig. 9 Inclined transverse grooves are shown, which are arranged at an angle to the longitudinal axis of the rotor, ie not parallel to it. For example, the angle may be 30 degrees.

[0103] according to Fig.10 , the structured portion may be formed in a rhombus shape.

[0104] Figure 7 A representation of an exemplary embodiment of a method 100 and an exemplary use 150 is shown. In particular, the method 100 comprises a step 110 of providing a rotor wall 3. In particular, a rotor wall 3 suitable for the corresponding purpose is selected from a set of rotor walls 3 and is provided so as to be connectable to a rotor base 1. In a step 120 of providing a rotor base 1, a rotor base 1 is selected from a set of rotor bases 1 accordingly, so as to be appropriately selected for this purpose and to be supplemented with the selected rotor wall 3. The rotor wall 3 and the rotor base 1 can be selected in any order. In a step 130 of connecting the rotor wall 3 to the rotor base 1, the rotor wall and the rotor base are contacted with each other and connected accordingly. The connection can be achieved by pressing, screwing, gluing or welding. Alternatively, the rotor wall 3 and the rotor base 1 can be connected to each other via magnetic interaction. In a step 140, the composite material consisting of the rotor wall 3 and the rotor base 1 is connected to the holding part 2 and in particular inserted into a textile machine. Corresponding connection methods can be used here, as described with respect to connecting the rotor wall 3 to the rotor base 1.

[0105] In one embodiment, a rotor 10, in particular comprising a rotor wall 3, a rotor base 1 (in particular as described) and possibly a holding part 2, can be formed for use in a rotor spinning process. The rotor 10, which can also be referred to as a spinning rotor, can therefore consist of at least two parts (rotor base 1 and rotor wall 3), wherein the rotor base 1 comprises a groove 4 (also referred to as a fiber collecting groove) and the rotor wall 3 comprises a fiber sliding surface 9, which can in particular be arranged on a fiber sliding wall. Thus, as described elsewhere, the materials and coatings can be adapted to the corresponding requirements of the use 150. In addition to the materials mentioned elsewhere, materials such as steel or ceramic can be provided for the rotor base 1. According to one field of application of the rotor 10, one use is in particular the spinning of cotton fibers and / or viscose fibers, which are particularly suitable for high rotor speeds, into yarn. In particular when spinning 100% viscose fibers, the groove coating in diamond and the fiber sliding surface coating in nickel produce very good yarn quality. According to this specific embodiment, in general, individual fiber properties may react differently when in contact with different functional surfaces 6, or more simply, properties that are advantageous for viscose fibers may not necessarily be effective for other fiber materials. For this reason, the rotor 10, in particular as described and in particular formed by the method 100, makes it possible to adapt the use 150 to the fiber to be spun.

[0106] "May" refers in particular to optional features of the invention. Thus, there are also improvements and / or exemplary embodiments of the invention which additionally or alternatively have one or more corresponding features. From the combination of features disclosed in the present case, separate features may also be adopted and used as required, by resolving possible structural and / or functional relationships between the features, in combination with other features for defining the subject matter of the claims.

[0107] Reference numerals list

[0108] 1 Rotor base

[0109] 2. Keep the components

[0110] 3 Rotor wall

[0111] 4 Grooves

[0112] 5 Maximum radial outer point of the groove

[0113] 6 Functional Surface

[0114] 7 Hexagon bolt

[0115] 8 Ear

[0116] 9 Fiber sliding surface

[0117] 10 Rotor

[0118] 11 Entrance opening

[0119] 12 Contact area

[0120] 13 Gap

[0121] 14 Bottom of rotor base

[0122] 15 Point at maximum axial distance from the rotor inlet opening

[0123] 16 Contact area

[0124] 18 hole groove

[0125] 20 Rotation axis

[0126] 21 holes

[0127] 22 Reception Area

[0128] 23 Top of the ear

[0129] 24 Gap

[0130] 25 Contact surface

[0131] 26 Contact surface

[0132] 27 Contact surface between the rotor wall and the edge of the groove axially facing the inlet opening of the rotor wall

[0133] 28 Contact area

[0134] 29 points

[0135] 30 Flange-like structure

[0136] 31 Contact surface

[0137] 50 Structural Department

[0138] 52 point structure

[0139] 54 Wave structure

[0140] 56 Partial longitudinal groove

[0141] 58 lateral groove

[0142] 100 Method for forming a rotor and / or a textile machine

[0143] 110 Setting the rotor wall

[0144] 120 Setting the rotor base

[0145] 130 Connecting the rotor wall and the rotor base

[0146] 140 Joining the composite material of rotor wall and rotor base with retaining components and inserting it into a textile machine

[0148] 150 Use of rotors and / or textile machines

[0149] A Section

Claims

1. A rotor (10) for a textile machine, in particular a rotor spinning machine, comprising: - a rotor wall (3) having a fibrous sliding surface (9); It is characterized in that the rotor (10) - comprising a rotor base (1) formed integrally with the groove (4); The rotor wall (3) and the rotor base (1) are separate components, and the rotor wall (3) and the rotor base (1) are arranged relative to each other in such a way that the fiber sliding surface (9) opens into the groove (4).

2. The rotor (10) according to claim 1, characterized in that The rotor wall (3) is arranged to be inserted into the rotor base (1); or wherein the rotor base (1) is arranged to be inserted into the rotor wall (3).

3. The rotor (10) according to claim 1, characterized in that A holding member (2) is arranged to rotatably support the rotor (10).

4. The rotor (10) according to claim 3, characterized in that The retaining component (2) is formed so as to be arranged so as to receive a region of the rotor base (1), in particular on a side of the rotor base (1) arranged away from the rotor wall (3); or wherein the retaining component (2) is formed so as to be arranged so as to receive a region of the rotor base (1), in particular on the side of the rotor base (1) arranged away from the rotor wall (3), and a region of the rotor wall (3), in particular a radially outer region.

5. The rotor (10) according to one of the preceding claims, characterized in that At least one of the rotor base (1) or the fiber sliding surface (9) comprises at least one material selected from the group consisting of: ceramic, polymer, polymer composite, fiber reinforced plastic material, metal, steel, aluminum, boronized metal, boronized steel, diamond-coated material, diamond-coated metal, diamond-coated steel, diamond-coated aluminum or nickel-plated metal, nickel-plated steel or nickel-plated aluminum.

6. The rotor (10) according to claim 3, characterized in that At least two of the components selected from the rotor wall (3), the rotor base (1), and the retaining component (2) are formed to be connectable to each other, wherein the connection is selected from pressing, screwing, bonding, welding operations, or wherein at least two of the components are connectable to each other via magnetic interaction.

7. The rotor (10) according to one of the preceding claims, characterized in that At the transition from the fiber sliding surface (9) to the groove (4), in particular in the assembled state, an ear (8) is formed in a direction facing away from the opening in the rotor wall (3).

8. The rotor (10) according to claim 7, characterized in that The ear (8) protrudes into the groove (4) by 0.01 mm to 0.5 mm; or protrudes into the groove (4) by 0.1 mm to 0.4 mm; or protrudes into the groove (4) by 0.2 mm to 0.3 mm; Alternatively, it protrudes 0.25 mm into the groove (4).

9. The rotor (10) according to one of the preceding claims, characterized in that The distance in the radial direction between the transition point (29) where the fiber leaves the fiber sliding surface (9) and the radially outermost point (5) of the groove (4) is between 0.5 mm and 1.5 mm; or between 0.6 mm and 1.3 mm; or between 0.65 mm and 1.27 mm; or 0.7 mm; or 0.76 mm; or 1.26 mm.

10. The rotor (10) according to one of the preceding claims, characterized in that The fiber sliding surface (9) comprises a structuring (50), in particular selected from a dot structure (52), a wave-like structure (54), a structure with partial longitudinal grooves (56) or a structure with transverse grooves (58).

11. A textile machine comprising a rotor (10) according to one of the preceding claims.

12. A method (100) for forming a rotor (10) according to one of claims 1 to 10, comprising the following steps: - providing (110) a rotor wall (3); - providing (120) a rotor base (1); - Connecting (130) the rotor wall (3) and the rotor base (1).

13. Use (150) of a rotor (10) and / or a textile machine according to one of claims 1 to 11.

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