Free-end spinning rotor, rotor shaft and rotor cup for free-end spinning rotor

Abstract

The invention relates to a free-end spinning rotor, a rotor shaft and a rotor cup for a free-end spinning rotor, the free-end spinning rotor (1) comprising: a rotor shaft (2) by means of which the free-end spinning rotor (1) can be supported in a bearing (3), in particular a magnetic bearing; and a rotor (4) in which fiber material can be spun. The rotor shaft (2) and the rotor cup (4) are detachably connected to each other by means of a coupling device (5), the coupling device (5) comprising a magnetic means (6), in particular a permanent magnet, for the axial connection of the rotor shaft (2) and the rotor cup (4), and a form-fitting connection for transmitting a torque between the rotor shaft (2) and the rotor cup (4), the form-fitting connection comprises a first coupling contour (8) arranged on the rotor shaft (2) and a second coupling contour (9) arranged on the rotor cup (4). The first coupling contour (8) and the second coupling contour (9) are designed as polygonal flower-shaped contours, in particular hexagonal flower-shaped contours.

Description

Technical Field

[0001] This invention relates to a free-end spinning rotor, comprising: a rotor shaft by means of which the free-end spinning rotor can be supported in a support, particularly a magnetic support; and a rotor in which fibrous material can be spun, wherein the rotor shaft and the rotor are separably connected to each other by a coupling device. The coupling device includes a magnetic mechanism, particularly a permanent magnet, for axial connection of the rotor shaft and the rotor, and a form-fit connection for transmitting torque between the rotor shaft and the rotor. Here, the form-fit connection includes a first coupling profile arranged at the rotor shaft and a second coupling profile arranged at the rotor. Furthermore, the invention also relates to a corresponding rotor shaft and a corresponding rotor for such a free-end spinning rotor. Background Technology

[0002] Document EP 1 156 142 B1 discloses a two-piece free-end spinning rotor, in which the rotor shaft and rotor cup are detachably connected to each other by a coupling device. This allows the rotor shaft to remain mounted in a support when the rotor cup is disassembled, which is particularly advantageous for magnetic supports. The coupling device here comprises a receiving sleeve arranged on the rotor shaft, the receiving sleeve having an inner polygon that interacts with a corresponding outer polygon at the rotor cup. Summary of the Invention

[0003] The purpose of this invention is to provide a free-end spinning rotor capable of reliably transmitting torque. Furthermore, this invention also provides a corresponding rotor cup and a corresponding rotor shaft.

[0004] This objective is achieved by a free-end spinning rotor, rotor shaft, and rotor cup having the features of the independent claims.

[0005] The free-end spinning rotor includes: a rotor shaft, by means of which the free-end spinning rotor is supported in a support, particularly a magnetic support; and a rotor in which fibrous material can be spun. The rotor shaft and the rotor are separably connected to each other by a coupling device, wherein the coupling device includes a magnetic mechanism, particularly a permanent magnet, for axial connection of the rotor shaft and the rotor, and a form-fit connection for transmitting torque between the rotor shaft and the rotor. The form-fit connection includes a first coupling profile arranged at the rotor shaft and a second coupling profile arranged at the rotor.

[0006] For this type of spinning rotor, it is proposed that the first and second coupling profiles be constructed as mehrrund profiles, particularly hexagonal mehrrund profiles. A particular advantage of the mehrrund profile is that it prevents the coupling device from jamming, even under high torque loads. This also allows for the reliable transmission of greater torque, while reducing the risk of damage to the inner profile compared to hexagonal or mehrrund profiles. In summary, the mehrrund profile also reliably transmits higher torque with less wear. This also allows for the replacement of only the rotor cup itself, even when the yarn-forming surface wears, while the rotor shaft can continue to be used.

[0007] Of course, the same advantages can also be achieved through a corresponding rotor shaft, which can be supported in a bearing, particularly a magnetic bearing, and which has a first part of a coupling device for detachable connection with the rotor cup of the free-end spinning rotor; and through a corresponding rotor cup, in which the fibrous material can be spun, and which has a second part of a coupling device for detachable connection with the rotor shaft of the free-end spinning rotor. These are also subject to protection.

[0008] Here, the rotor shaft includes a first coupling profile for engaging with the shape of a second coupling profile of the rotor cup, the first coupling profile being constructed as a polygonal flower profile.

[0009] The rotor includes a second coupling profile for engaging with a first coupling profile shape of the rotor shaft, the second coupling profile being constructed as a polygonal flower profile.

[0010] Particularly advantageous is that the first and second coupling profiles are constructed as hexagonal flower-shaped profiles. The hexagonal flower-shaped profile is most suitable for the diameter of the rotor shaft or coupling device, thus allowing for the arrangement of sufficient torque transmission surfaces. However, in principle, especially when the diameter of the coupling device is large, more than six arc-shaped teeth can be provided in the first and second coupling profiles. Furthermore, especially when the diameter of the coupling device is small, fewer than six arc-shaped teeth in the first and second coupling profiles can also be considered.

[0011] Furthermore, it is advantageous that the first coupling profile arranged at the rotor shaft is constructed as an outer polygonal flower profile, while the second coupling profile arranged at the rotor cup is constructed as an inner polygonal flower profile. This allows for the advantageous arrangement of permanent magnets directly adjacent to the inner polygonal flower profile within the rotor cup for axial fixation. Since the rotor cup must be operated more frequently than the rotor shaft, the risk of damage to the coupling profile at the rotor cup is, in principle, greater than the risk of damage to the coupling profile at the rotor shaft. Therefore, arranging the inner polygonal flower profile at the rotor cup further enhances the protection of the coupling profile at the rotor cup from damage.

[0012] Here, it is particularly advantageous that the first coupling profile arranged at the rotor shaft is constructed as an external hexagonal flower profile. Similarly, it is particularly advantageous that the second coupling profile arranged at the rotor cup is constructed as an internal hexagonal flower profile.

[0013] Furthermore, it is advantageous that the rotor cup has a housing for the magnetic mechanism, particularly the permanent magnet. This makes the permanent magnet easily accessible and therefore allows for particularly easy replacement. Consequently, the permanent magnet can be replaced without removing the rotor shaft from the support.

[0014] Here, it is particularly advantageous that the receiving portion is arranged offset behind the second coupling profile in the axial direction of the rotor cup towards the rotor base. Thus, the permanent magnet can also be arranged directly behind the coupling profile and therefore interact directly with the coupling profile of the rotor shaft. This results in a particularly good and reliable axial connection between the rotor shaft and the rotor cup. Furthermore, the permanent magnet is particularly easily accessible for replacement at this location and can be easily reached through the coupling profile. However, alternatively, it is also possible to arrange the permanent magnet inside the rotor cup, within the rotor base.

[0015] Equally advantageous is that the first coupling profile is positioned at the first insert within the rotor shaft. This simplifies the manufacturing of the coupling profile. Furthermore, designing the coupling profile as the insert allows for optimal matching between the materials of the rotor shaft and the insert. Additionally, the multi-piece design of the rotor shaft facilitates the integration of other components. For example, the multi-piece design allows for the arrangement of permanent magnets for individually driving the spinning rotor in an electric motor-like manner within the rotor shaft. Similarly, specific materials can be used in the support area of ​​the spinning rotor, while the insert with the coupling profile can, for example, be made of a harder material.

[0016] Another advantage is that the second coupling profile is positioned at the protrusion of the rotor or at the second insert inserted into the rotor. This also allows for optimal matching between the material of the actual rotor and the material of the coupling profile. Furthermore, for the rotor, if the coupling profile is located at the insert, the manufacturing of the coupling profile is also simplified.

[0017] It is particularly advantageous that the coupling profile is located at the insertion sleeve, or that the insert is constructed as an insertion sleeve. In this case, the second insert or insertion sleeve includes a coupling profile constructed as an external polygonal flower shape, and preferably also includes a receiving portion for a magnetic mechanism, particularly a permanent magnet.

[0018] Advantageously, the rotor shaft has a sleeve that surrounds the protrusion of the rotor cup and / or the second insert or insert sleeve of the rotor cup in the assembled state of the free-end spinning rotor. This also provides good protection for the coupling device during the operation of the free-end spinning rotor. If the polygonal floral profile of the rotor shaft is constructed as an external polygonal floral profile, the external polygonal floral profile is also well protected by the sleeve. The sleeve is preferably integrally formed. This allows the rotor shaft or a portion thereof to be manufactured in a single process along with the sleeve.

[0019] Furthermore, it is advantageous that the sleeve and the protrusion, or the sleeve and the second insert or insert sleeve, each have a centering section and form a centering mechanism for the coupling device. This allows the rotor cup to automatically and correctly center relative to the rotor shaft after the coupling device is inserted together. Attached Figure Description

[0020] Other advantages of the present invention are described in the following embodiments. Wherein:

[0021] Figure 1 A schematic cross-sectional view of a free-end spinning device with a free-end spinning rotor having a coupling device is shown.

[0022] Figure 2 The rear view shows a schematic diagram of a rotating cup with a portion of the coupling device;

[0023] Figure 3 A schematic diagram of a rotor shaft with a portion of the coupling device is shown in a side view;

[0024] Figure 4 A schematic diagram of a rotor shaft with a coupling device is shown in a side sectional view.

[0025] Figure 5 A schematic diagram of a rotating cup with a portion of the coupling device and a magnetic mechanism is shown in a side sectional view; and

[0026] Figure 6 A schematic diagram of a rotating cup with an insert containing a portion of a coupling device is shown in a side sectional view. Detailed Implementation

[0027] In the following description of the accompanying drawings, the same reference numerals are used to denote corresponding identical and / or at least comparable features in the figures. Each feature, its design, and / or mode of operation is typically described in detail only upon its first mention. If a feature is not described in detail again, its design and / or mode of operation correspond to the design and mode of operation of a feature with the same function or name that has already been described. Furthermore, for clarity, for multiple identical parts or features, usually only one or a few are labeled.

[0028] Figure 1A schematic cross-sectional view shows a free-end spinning device 22 with a free-end spinning rotor 1 and a coupling device 5. The free-end spinning device 22 has a free-end spinning rotor 1, which includes a rotor shaft 2 and a rotor cup 4. The free-end spinning rotor 1 is rotatably supported in a support 3 via its rotor shaft 2, which is currently designed as a magnetic support. The fibrous material is spun into yarn in the rotor cup 4. Here, the free-end spinning rotor 1 is arranged in the free-end spinning device 22 such that the rotor cup 4 is located in a rotor housing 17 under negative pressure, while the rotor shaft 2 extends through the rear wall of the rotor housing 17 into a support housing 18. The free-end spinning rotor 1 shown here is driven by a driver 21, which is currently constructed as a single driver and includes a stator 20 and a magnet 19. The stator 20 and its stator windings are currently arranged between two support portions of the support 3.

[0029] Each support portion of the magnetic support shown here includes a magnet surrounding the rotor shaft 2, one magnet being connected to the rotor shaft 2 and the other magnet being connected to the stator 20. Therefore, removing the entire free-end spinning rotor 1 from the free-end spinning device 22 requires considerable force. Therefore, the free-end spinning rotor 1 includes a coupling device 5, allowing the rotor cup 4 to be easily separated from the rotor shaft 2 and removed from the open rotor housing 17. Here, a portion of the coupling device 5 is arranged at the rotor shaft 2, and another portion is arranged at the rotor cup 4. The coupling device 5 includes a magnetic mechanism 6 for the axial connection of the rotor shaft 2 and the rotor cup 4 (see...). Figure 5 and Figure 6 ( ), and a form-fit connection for transmitting torque between the rotor shaft 2 and the rotor cup 4. This form-fit connection will be described below according to... Figure 2 and Figure 3 The description includes a first coupling profile 8 arranged at the rotor shaft 2 and a second coupling profile 9 arranged at the rotor cup 4.

[0030] Figure 2 The rear view shows a schematic diagram of the rotor 4 with a portion of the coupling device 5. The rotor 4 has a protrusion 13 protruding from the rotor base 11 on its rear side opposite its open end, and the coupling device 5 (see [reference]). Figure 1 A portion of the rotor 4 is arranged at the protrusion. For this purpose, a polygonal floral profile is formed at the protrusion 13 of the rotor 4 as part of the second coupling profile 9 or coupling device 5. In the present case, this polygonal floral profile is constructed as an internal hexagonal floral profile. This internal hexagonal floral profile is complementary to the one formed at the rotor shaft 2 (see [reference]). Figure 3 The interaction of the outer hexagonal flower-shaped contours is as follows: Figure 3 As stated above.

[0031] Figure 3A schematic diagram of a rotor shaft with a portion of a coupling device 5 is shown in a side view. A portion of the coupling device 5 includes a first coupling profile 8 formed at the rotor shaft 2, which is constructed as a polygonal flower profile. In the present case, this polygonal flower profile is constructed as an external hexagonal flower profile, which can complement an internal hexagonal flower profile formed at the rotor cup 4 (e.g., ...). Figure 2 (As shown) interaction.

[0032] The two parts of the coupling device 5 can be easily plugged together to assemble the coupling device 5. Because the first coupling profile 8 and the second coupling profile 9 are constructed with polygonal floral profiles, the coupling device 5 can also reliably transmit high torque. The rounded design of each tooth or tooth tip allows for particularly good force transmission. This avoids, for example, curling that might occur in a hexagonal profile, and the resulting wear.

[0033] exist Figure 2 and Figure 3 In the design shown, the outer polygonal floral profile is arranged at the rotor shaft 2 and the inner polygonal floral profile is arranged at the rotor cup 4. This is particularly advantageous because it provides good protection for the second coupling profile 9 at the rotor cup 4. However, it is also possible to place the outer polygonal floral profile at the rotor cup 4 and the inner polygonal floral profile at the rotor shaft 2. Furthermore, unlike the illustration, other polygonal floral profiles may be used for the coupling device 5 instead of hexagonal floral profiles.

[0034] Figure 4 A schematic diagram of a portion of the rotor shaft 2 with coupling device 5 is shown in a side sectional view. Figure 3 Unlike the design shown here, in the rotor shaft 2, a first coupling profile 8, also constructed in the form of an external polygonal floral profile, is arranged at the first insert 12 that is inserted into the rotor shaft 2. Thus, the first coupling profile 8 can be manufactured more easily and inserted into the rotor shaft 2 more readily. This multi-piece design also allows for optimal matching of the material of the coupling profile 8 with the application of the coupling device 5, and simultaneously allows for matching of the material of the rotor shaft 2, for example, with its application in the support 3.

[0035] According to the current illustration, the rotor shaft 2 also has a sleeve 15 that surrounds the protrusion 13 in the assembled state of the free-end spinning rotor 1, or, where appropriate, also surrounds the insertion sleeve of the rotor cup 4 (see [reference]). Figure 5 and Figure 6 Thus, the coupling device 5 is well protected in the assembled state of the free-end spinning rotor 1. Furthermore, in the design with sleeve 15, it is advantageous that the inner surface of sleeve 15 can also serve as a centering section 16, which, together with the centering section 16 at the rotor 4 (see...). Figure 5 and Figure 6Together, they ensure optimal centering of the rotor cup 4 relative to the rotor shaft 2.

[0036] According to the current illustration, the sleeve 15 is integrally formed at the rotor shaft 2. However, as an alternative to the illustration, it is also possible to separately provide the sleeve 15 and insert it onto the rotor shaft 2, and connect it to the rotor shaft, for example, by bonding or otherwise. Furthermore, unlike the illustration, the first coupling profile 8 may be provided only at the first insert 12, without the sleeve 15. Additionally, as an alternative to the illustration, the first insert 12, having an inner polygonal floral profile, may be provided as the first coupling profile 8. In this case, it is also possible to combine the insert 12 and the sleeve 15 together.

[0037] As mentioned at the beginning, the coupling device 5 also includes a magnetic mechanism 6 for the axial connection between the rotor 4 and the rotor shaft 2. The magnetic mechanism 6 can, in principle, be arranged at either the rotor 4 or the rotor shaft 2, and... Figures 1 to 4 Not shown in the image.

[0038] Figure 5 A schematic diagram of the rotating cup 4, including a portion of the coupling device 5 and the magnetic mechanism 6, is shown in a sectional side view. According to... Figure 5 In this design, the rotor 4 has a receiving portion 10 for the magnetic mechanism 6, which is currently constructed as a permanent magnet. The receiving portion 10 is located in the region of the protrusion 13 of the rotor 4. According to the current example, the receiving portion 10 is arranged offset behind the second coupling profile 9 in the axial direction of the rotor 4 towards the rotor base 11 of the rotor 4. Thus, the receiving portion 10 and the second coupling profile 9 can be manufactured in a single process. Furthermore, the magnetic mechanism 6 is easily accessible due to its location behind or adjacent to the coupling profile 9, and therefore can be easily replaced when it reaches the end of its service life. However, unlike the illustrated version, the receiving portion 10 can also be arranged in the region inside the rotor 4, located within the rotor base 11.

[0039] In this case, the second coupling profile 9 is again constructed as an inner polygonal flower profile. However, in principle, the second coupling profile 9 can also be designed as an outer polygonal flower profile. Here, a permanent magnet can also be set inside the outer polygonal flower profile as a magnetic mechanism 6.

[0040] Furthermore, a centering section 16 is formed on the outer side of the protrusion 13, which interacts with the centering section 16 of the rotor shaft 2, thereby making the rotor cup 4 correctly centered relative to the rotor shaft 2.

[0041] also, Figure 6 A schematic diagram of the rotating cup 4 with a second insert 14, comprising part of a coupling device, is also shown in a sectional side view. Figure 5Similar to the rotor 4, the second coupling profile 9 is constructed as an inner polygonal flower shape, and the receiving portion 10 for the magnetic mechanism 6 is also arranged offset behind the second coupling profile 9 in the axial direction of the rotor 4 towards the rotor base 11. However, the receiving portion 10 and the second coupling profile 9 are arranged at the second insert 14, which can be inserted into the rotor base 11 of the rotor 4. As with the rotor shaft 2, the manufacture of the second coupling profile 9 is also facilitated by its placement at the insert 14.

[0042] Furthermore, in this design, a centering section 16 is also formed on the outer side of the protrusion 13. This centering section interacts with the centering section 16 of the rotor shaft 2, thereby making the rotor cup 4 correctly centered relative to the rotor shaft 2.

[0043] Unlike the illustration shown, the receiving portion 10 can also be located at the insert, but in the area of ​​the rotor base 11, inside the inner side of the rotor 4. Furthermore, the second coupling profile 9 can be designed as an outer polygonal floral profile.

[0044] In addition, with Figure 5 and Figure 6 Unlike the illustration shown, according to a variant not shown, the protrusion 13 or insert 14 of the rotor 4 can be extended to form a sleeve 15, which surrounds and protects the coupling device 5 in the assembled state of the free-end spinning rotor 1. It should be understood that in this case, the rotor shaft 2 does not have a sleeve 15, similar to... Figure 3 As shown. Furthermore, in this case, a portion of the outer periphery of the rotor shaft 2 can be used as the centering section 16.

[0045] This invention is not limited to the embodiments shown and described. Variations may also be made within the scope of the patent claims, such as combining features, even though these features have been illustrated and described in different embodiments.

[0046] List of reference numerals

[0047] 1. Free-end spinning rotor

[0048] 2. Rotor shaft

[0049] 3 Supports

[0050] 4. Spin the cup

[0051] 5. Coupling device

[0052] 6. Magnetic Mechanism

[0053] 8 First Coupling Profile

[0054] 9 Second Coupling Profile

[0055] 10. Reception area

[0056] 11 Rotor base

[0057] 12 First insert

[0058] 13. Protrusion

[0059] 14 Second insert

[0060] 15 sleeves

[0061] 16. Focusing Section

[0062] 17 Rotor housing

[0063] 18 Support housing

[0064] 19 Magnets

[0065] 20 stators

[0066] 21 drives

[0067] 22 Free-end spinning device

Claims

1. A free-end spinning rotor (1), the free-end spinning rotor comprising: The rotor shaft (2) allows the free-end spinning rotor (1) to be supported by means of the rotor shaft in a support (3), particularly a magnetic support; and Rotor (4), in which the fiber material can be spun. The rotor shaft (2) and the rotating cup (4) are detachably connected to each other via a coupling device (5). The coupling device (5) includes a magnetic mechanism (6) for axial connection of the rotor shaft (2) and the rotor cup (4), particularly a permanent magnet, and a form-fit connection for transmitting torque between the rotor shaft (2) and the rotor cup (4). The shape-fitting connection includes a first coupling profile (8) arranged on the rotor shaft (2) and a second coupling profile (9) arranged on the rotor cup (4). Its features are, The first coupling profile (8) and the second coupling profile (9) are constructed as polygonal flower-shaped profiles, particularly hexagonal flower-shaped profiles.

2. The free-end spinning rotor (1) according to the preceding claim, characterized in that, The first coupling profile (8) arranged at the rotor shaft (2) is constructed as an external polygonal flower profile, particularly an external hexagonal flower profile, and the second coupling profile (9) arranged at the rotor cup (4) is constructed as an internal polygonal flower profile, particularly an internal hexagonal flower profile.

3. The free-end spinning rotor (1) according to any one of the preceding claims, characterized in that, The rotating cup (4) has a receiving portion (10) for the permanent magnet, wherein the receiving portion (10) is preferably arranged offset behind the second coupling profile (9) in the axial direction of the rotating cup (4) toward the rotating cup base (11).

4. The free-end spinning rotor (1) according to any one of the preceding claims, characterized in that, The first coupling profile (8) is arranged at the first insert (12) inserted into the rotor shaft (2).

5. The free-end spinning rotor (1) according to any one of the preceding claims, characterized in that, The second coupling profile (9) is arranged at the protrusion (13) of the rotating cup (4), or at the second insert (14) inserted into the rotating cup (4), particularly at the insert sleeve.

6. The free-end spinning rotor (1) according to any one of the preceding claims, characterized in that, The rotor shaft (2) has a preferably integrally formed sleeve (15) that surrounds the protrusion (13) and / or the second insert (14), particularly the insert sleeve, of the rotor (4) in the assembled state of the free-end spinning rotor (1).

7. The free-end spinning rotor (1) according to any one of the preceding claims, characterized in that, The sleeve (15) and the protrusion (13) or the sleeve (15) and the second insert (14) each have a centering section (16) and form a centering mechanism for the coupling device (5).

8. A rotor shaft (2) for a free-end spinning rotor (1), said rotor shaft being able to be supported in a support (3), particularly a magnetic support, in, The rotor shaft (2) has a first part of a coupling device (5) for detachable connection with the rotor cup (4) of the free-end spinning rotor (1), wherein the coupling device (5) includes a magnetic mechanism (6) for axial connection of the rotor shaft (2) and the rotor cup (4) and a form-fit connection for transmitting torque between the rotor shaft (2) and the rotor cup (4). Furthermore, the rotor shaft (2) includes a first coupling profile (8) for connecting with the shape of the second coupling profile (9) of the rotor (4). Its features are, The first coupling profile (8) is constructed as a polygonal flower profile, particularly a hexagonal flower profile.

9. The rotor shaft (2) according to the preceding claim, characterized in that, The first coupling profile (8) is constructed as an external polygonal flower profile, especially an external hexagonal flower profile.

10. The rotor shaft (2) according to any one of the preceding claims, characterized in that, The first coupling profile (8) is arranged at the first insert (12) inserted into the rotor shaft (2).

11. The rotor shaft (2) according to any one of the preceding claims, characterized in that, The rotor shaft (2) has a sleeve (15) preferably integrally formed, which surrounds the protrusion (13) and / or the second insert (14) of the rotor (4) in the assembled state of the free end spinning rotor (1), wherein the sleeve (15) preferably has a centering section (16).

12. A rotor (4) for a free-end spinning rotor (1), wherein the fiber material can be spun in the rotor. in, The rotor (4) has a second part of a coupling device (5) for detachable connection with the rotor shaft (2) of the free-end spinning rotor (1), wherein the coupling device (5) includes a magnetic mechanism (6) for axial connection of the rotor shaft (2) and the rotor (4) and a form-fit connection for transmitting torque between the rotor shaft (2) and the rotor (4). Furthermore, the rotor (4) includes a second coupling profile (9) for connecting with the shape of a first coupling profile (8) of the rotor shaft (2). Its features are, The second coupling profile (9) is constructed as a polygonal flower profile, especially a hexagonal flower profile.

13. The rotor (4) according to the preceding claim, characterized in that, The second coupling profile (9) is constructed as an inner polygonal flower profile, especially an inner hexagonal flower profile.

14. The rotor (4) according to any one of the preceding claims, characterized in that, The rotating cup (4) has a receiving portion (10) for a magnetic mechanism (6), particularly a permanent magnet, wherein the receiving portion (10) is preferably arranged offset behind the second coupling profile (9) in the axial direction of the rotating cup (4) toward the rotor base (11).

15. The rotor (4) according to any one of the preceding claims, characterized in that, The second coupling profile (9) is arranged at the protrusion (13) of the rotating cup (4) or at the second insert (14) inserted into the rotating cup (4), particularly at the insertion sleeve, wherein the protrusion (13) or the second insert (14) preferably has a centering section (16).

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