OPEN-END SPINNING DEVICE FOR AN OPEN-END SPINNING MACHINE AND OPEN-END SPINNING MACHINE

Abstract

An open-end spinning device for an open-end spinning machine includes an individually drivable spinning rotor having a rotor cup accommodated in a rotor housing. An individual drive for the spinning rotor arranged in a drive housing. A receptacle for a cover element that closes the rotor housing during spinning operations is provided. The rotor housing defines a central support part fixable to a machine frame of the open-end spinning machine. The rotor housing is formed as one piece with the drive housing and the receptacle for the cover element.

Claims

1-15. (canceled)

16. An open-end spinning device for an open-end spinning machine, comprising: an individually drivable spinning rotor having a rotor cup accommodated in a rotor housing; an individual drive for the spinning rotor arranged in a drive housing; at least one receptacle for a cover element that closes the rotor housing during spinning operations; the rotor housing defining a central support part fixable on a machine frame of the open-end spinning machine; and the rotor housing formed as one piece with the drive housing and the at least one receptacle for the cover element.

17. The open-end spinning device of claim 16, wherein the rotor housing is formed as a cast part such that the at least one receptacle for the cover element is integrally cast onto the rotor housing.

18. The open-end spinning device of claim 16, wherein the rotor housing comprises fastening devices integrally formed thereon to fix the rotor housing to the machine frame.

19. The open-end spinning device of claim 16, wherein the rotor housing comprises a cast-on frame that defines the at least one receptacle for the cover element.

20. The open-end spinning device of claim 16, wherein the drive housing comprises at least one bearing point of a magnetic bearing assembly for the spinning rotor.

21. The open-end spinning device of claim 16, wherein the at least one receptacle for the cover element defines a swivel axis, and further comprising the cover element accommodated in the at least one receptacle and swivelable about the swivel axis.

22. The open-end spinning device of claim 21, wherein the cover element comprises an opening roller housing integrally formed on the cover element.

23. The open-end spinning device of claim 22, wherein the cover element is formed as a cast part, wherein the opening roller housing is integrally cast onto the cover element.

24. The open-end spinning device of claim 21, wherein the rotor housing comprises a stop for the cover element to position the cover element in the axial direction of the spinning rotor.

25. The open-end spinning device of claim 24, wherein the stop is adjustable.

26. The open-end spinning device of claim 24, wherein the stop is arranged in an area of the rotor housing facing away from the at least one receptacle for the cover element.

27. The open-end spinning device of claim 21, wherein the rotor housing comprises a positioning device that locates the cover element in an axial direction of the swivel axis.

28. The open-end spinning device of claim 27, wherein the positioning device is cast directly onto the rotor housing.

29. The open-end spinning device of claim 28, wherein the positioning device comprises a plastic coating.

30. An open-end spinning machine, comprising: a plurality of adjacently arranged workstations; and wherein each of the workstation comprises the open-end spinning device of claim 16.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Further advantages of the invention are described with reference to the exemplary embodiments represented in the following, wherein:

[0029] FIG. 1 shows an open-end spinning machine in a schematic overview representation,

[0030] FIG. 2 shows a workstation of an open-end spinning machine with an open-end spinning device in a schematic, partially cut side view,

[0031] FIG. 3 shows a perspective representation of a rotor housing according to a first embodiment,

[0032] FIG. 4 shows a perspective representation of a rotor housing according to a second embodiment,

[0033] FIG. 5 shows a schematic, cut side view of a rotor housing with a cover element mounted thereon, and

[0034] FIG. 6 shows a schematic top view of a positioning device.

DETAILED DESCRIPTION

[0035] Reference will now be made to embodiments of the invention, one or more examples of which are shown in the drawings. Each embodiment is provided by way of explanation of the invention, and not as a limitation of the invention. For example features illustrated or described as part of one embodiment can be combined with another embodiment to yield still another embodiment. It is intended that the present invention include these and other modifications and variations to the embodiments described herein.

[0036] In the following description of the exemplary embodiments, features that are identical or at least comparable with respect to their design and/or mode of operation are provided with identical reference signs. Moreover, these features are explained in detail only at their first mention, while only the differences from the previously described exemplary embodiments are discussed in the subsequent exemplary embodiments. Moreover, for the sake of clarity, often only one or only a few of several identical components and/or features is/are labeled.

[0037] FIG. 1 shows a schematic front view of an open-end spinning machine 2. The open-end spinning machine 2 has, in a way known per se, a plurality of adjacently arranged workstations 34, which can be arranged between two frames 33 on one or also on both longitudinal sides of the open-end spinning machine 2. Each of the workstations 34 has, also in a known way, an opening roller 9 for opening a supplied fiber material 25 (see FIG. 2) into individual fibers and an open-end spinning device 1 for spinning the fiber material 25 into a thread 26. The spun thread 26 is then drawn off by means of a take-off device 27 and wound onto a package 29 by means of a winding device 28. For the purpose of controlling the processes at the open-end spinning machine 2, the spinning machine also has a control unit 35, which can interact with further control units 35 (not shown) arranged at the individual workstations 34.

[0038] FIG. 2 shows a detailed representation of a workstation 34 of an open-end spinning machine 2 of this type in a partially cut side view. As described above with respect to FIG. 1, the fiber material 25 is supplied to the open-end spinning device 1 and opened into individual fibers by means of the opening roller 9 and, from there, supplied to the open-end spinning device 1 through a fiber feed channel (not shown here).

[0039] The open-end spinning device includes, in a usual way, a spinning rotor 3, the rotor cup 4 of which revolves in a rotor housing 6 and the rotor shaft 5 of which is rotatably mounted in a drive housing 7. For this purpose, the spinning rotor 3 is driven by means of an individual drive 8, which is also arranged in the drive housing 7, and is mounted in a magnetic bearing assembly 16. The magnetic bearing assembly 16 includes a front radial bearing 17 and a rear radial bearing 18. Moreover, the spinning rotor 3 is supported in the axial direction by an axial bearing 19, which can also be designed as a magnetic bearing, but also as an air bearing or any other type of bearing. The rotor housing 6 is fixed, with the drive housing 7, at a machine frame 12 of the open-end spinning machine 2.

[0040] The rotor housing 6 is subjected to suction during the spinning operation, for the purpose of which the rotor housing 6 is connected to a suction channel 31 via a suction connection 30. During the spinning operation, the rotor housing 6 is closed with a cover element 11, which, in the present case, is fixed in receptacles 10 of the open-end spinning device 1 so as to be swivelable about a swivel axis 20. In order to open the rotor housing 6, the cover element 11 can therefore be swiveled out of the closed position represented by solid lines into the open position represented by dash-dotted lines. The cover element 11 is provided with an extension 36, which supports a thread take-off nozzle 37 and protrudes into the rotor cup 4 of the spinning rotor 3 during the spinning operation. The newly spun thread 26 is drawn off via the thread take-off nozzle 37. The extension 36 can also be designed as a channel insert adapter exchangeably arranged in the cover element 11, as shown in FIG. 5. In the present case, the cover element 11 simultaneously supports the opening roller 9, so that the cover element 11 is formed as one piece with an opening roller housing 21.

[0041] FIG. 3 shows a first embodiment of a rotor housing 6 according to the invention. The rotor housing 6 is designed as a central support part, which can be fixed by means of fastening devices, such as, for example, fastening bores 32, at a machine frame 12 (see FIG. 2) and at which further components of the open-end spinning device 2 can be arranged. The rotor housing 6 also includes, in addition to the housing for the spinning rotor 3 (see FIG. 2), the drive housing 7 and the receptacles 10 for the cover element 11. The receptacles 10 include, in the present case, bores, in which the cover element 11 is swivelably mounted and which, therefore, form a swivel axis 20 for the cover element 11.

[0042] These three components, rotor housing 6, drive housing 7, and receptacles 10, are formed as one piece with one another. Therefore, these can be advantageously designed as a highly compact cast part, which combines the aforementioned functions in one component and also enables the integration of numerous further functions and components of the open-end spinning device 1. It is particularly advantageous that all functional and contact surfaces and fastening devices, such as bores and the like, can be formed in one single clamping setup of the rotor housing 6. In other words, the rotor housing 6 needs to be clamped only one time for the machining. All metal-cutting machining steps can then be carried out on the rotor housing 6 without re-clamping the rotor housing 6. As a result, an extremely accurate position of the opening roller housing 21 and of the cover element 11 with respect to the rotor housing 6 can be ensured. The rotor housing 6 or the central support part can be produced highly cost-effectively despite the precise manufacture due to the design as a cast part and the machining in only one single clamping setup. Due to the highly precise positioning of the cover element 11 with the extension 36 and the thread take-off nozzle 37, considerable spinning technology-related advantages are also achieved and a high-quality yarn can be produced. Complicated adjustment operations at the open-end spinning device 1 can be dispensed with due to the one-piece design of the rotor housing 6 with the drive housing 7 and the receptacles 10.

[0043] In order to still support the exact positioning of the cover element 11 with respect to the rotor housing 6, a stop 22 can also be provided, which is explained in greater detail further below with reference to FIG. 5. By means of this stop 22, the cover element 11 can be correctly positioned with respect to the axial direction of the spinning rotor 3 during closing and in the closed position of the cover element 11.

[0044] FIG. 4 shows another embodiment of a rotor housing 6 according to the invention. In contrast to the rotor housing 6 from FIG. 3, the present rotor housing 6 has a cast-on, peripheral frame 14, which includes the receptacles 10 for the opening roller housing 21 and the cover element 11. The two receptacles 10 are connected by a cross brace. The frame 14 is therefore formed by the two receptacles 10 and, in the present case, a cross brace. As a result, the rotor housing 6 has a particularly high rigidity, which further supports the exact positioning of the cover element 11 with respect to the rotor housing 6 with the spinning rotor 3.

[0045] In the rotor housing 6 from FIG. 4, spacer bushes 13, as fastening devices, are cast directly onto the rotor housing 6. The spacer bushes 13 enable bolting directly onto a vertical wall of the machine frame 12 (see FIG. 2). The mounting of the rotor housing 6 at the open-end spinning device 1 is facilitated as a result. Of course, such spacer bushes 13 can also be cast on in the case of the rotor housing 6 from FIG. 3, in order to correctly position the rotor housing 6 at the machine frame 12.

[0046] A positioning device 23 is also apparent at the rotor housing 6 shown in the present case. By means of the positioning device 23, the cover element 11 can be positioned, during closing, in a correct position with respect to a direction transverse to the axis of the spinning rotor 3, i.e., in a width direction of the rotor housing 6 in the present case. In other words, by means of the positioning device 23, the cover element 11 is correctly positioned in an axial direction of the swivel axis 20 with respect to the rotor housing 6 and, thereby, the spinning rotor 3. The positioning device 23 can include only one positioning element 41 as shown in the present case. The positioning element 41 can be wrapped around, for example, by a bifurcated counterpart (not shown) at the cover element 11, as the result of which the cover element 11 is unambiguously positioned. Alternatively, it would also be conceivable to arrange a second positioning element 41 or a second positioning device 23 spaced apart from the positioning device 23 shown, in order to securely position the cover element 11 in both axial directions of the swivel axis 20. The positioning device 23 is also advantageously cast directly onto the rotor housing 6, as the result of which the correct positioning of the cover element 11 is always ensured without any adjustment effort. Similarly, due to the cast-on positioning device 23, the effort required to install the rotor housing 6 and the open-end spinning device 1 is further reduced.

[0047] FIG. 5 shows an open-end spinning device 1 in a schematic, cut representation. In contrast to FIGS. 3 and 4, the cover element 11 is arranged in the receptacles 10, so that the two components, the rotor housing 6 and the cover element 11, are represented in interaction. As described above with reference to FIG. 2, the cover element 11 also includes the opening roller housing 21 integrally formed onto the cover element 11 and is swivelably mounted at the receptacles 10 of the rotor housing 6, for example, by means of tabs 38. The extension 36 of the cover element 11 is also apparent. The extension 36 of the cover element 11 is designed in the present case as a channel insert adapter, which is insertable into the cover element 11.

[0048] According to the present representation, the spinning rotor 3 is shown in its operating position accommodated in the rotor housing 6. The rotor cup 4 is located within the rotor housing 6, while the rotor shaft 5 is located within the drive housing 7, which has been cast onto the rotor housing 6.

[0049] Moreover, the front radial bearing 17 of the magnetic bearing assembly 16 is also apparent in the present representation. As is apparent from FIG. 5, the drive housing 7 and, thereby, the rotor housing 6 connected to the drive housing 7 include the front bearing point 15 for the front radial bearing 17. Fastening bores 32 are provided in the drive housing 7 for this purpose, the fastening bores 32 enabling a mounting of the front radial bearing 17. According to the present representation, the drive housing 7 also includes fastening bores 32, which enable a mounting of the individual drive 8 in the drive housing 7. The rear radial bearing 18 (not visible here) can be mounted, for example, in a cover element 11, which is insertable into the drive housing 7. Alternatively, it would also be possible, however, to also mount the rear radial bearing 18 directly in the drive housing 7.

[0050] Moreover, a stop 22 for the cover element 11 is also provided in the open-end spinning device shown here. By means of the stop 22, the cover element 11 and, thereby, the thread take-off nozzle 37 are correctly positioned with respect to the axis of the spinning rotor 3. The stop 22 is designed in the present case as an adjusting screw, which is arranged so as to be axially parallel to the axis of the spinning rotor 3. Preferably, the stop 22 is arranged centrally with respect to the open-end spinning device 1 over the axis of the spinning rotor 3, as is also apparent from FIGS. 3 and 4.

[0051] It is also advantageous when the stop 22 is arranged in an area of the rotor housing 6 facing away from the receptacles 10 for the cover element 11, as shown in the present case. For example, in the present case, the stop 22 is arranged in an end area 39 of the rotor housing 6 situated opposite the receptacles 10. As a result, the stop 22 or the adjusting screw has a great distance to the swivel axis 20, which facilitates the adjustment of the stop 22. By means of such an adjustable stop 22, the distance between the thread take-off nozzle 37 and the spinning rotor 3 can be set in various ways and, for example, adapted to spinning technology-related conditions in a certain application.

[0052] It is also possible to fix the position of the cover element 11 with respect to the rotor housing 6 one time after the initial installation of the cover element 11 and, as a result, take possible tolerances into account, which tolerances can arise due to the installation of the magnetic bearing assembly 16 and the accommodation of the spinning rotor 3. It can also be provided that the stop 22 is not to be displaced again after the initial adjustment of the stop 22. If the stop 22 is designed as an adjusting screw, the adjusting screw can also be secured against twisting, for example. Screw locking devices, for example, or also screws that include a special head are also conceivable in this case.

[0053] In order to also prevent the stop 22, specifically the adjusting screw in this case, from twisting during operation, the adjusting screw can also be clamped against the rotor housing 6 with an O-ring 40 as shown here.

[0054] FIG. 6 also shows another embodiment of a positioning device 23 in a schematic top view. In contrast to the positioning device 23 from FIG. 4, the present positioning device 23 includes two positioning elements 41 situated opposite each other. In the present case, the positioning device 23 is therefore designed to be bifurcated. As the cover element 11 is closed, a corresponding counterpart (not shown) arranged at the cover element 11 enters the space between the two positioning elements 41 as indicated by the arrow, as the result of which the cover element 11 in turn is positioned exactly in both axial directions of the swivel axis 20 (see FIGS. 3 and 4). The positioning device 23 shown in the present case also has a plastic coating 24, which is applied on each of the positioning elements 41. The positioning of the thread take-off nozzle 37 with respect to the rotor cup 4 of the spinning rotor 3 is further improved as a result.

[0055] The present invention is not limited to the represented and described exemplary embodiments. Modifications within the scope of the claims are also possible, as is any combination of the described features, even if they are represented and described in different parts of the description or the claims or in different exemplary embodiments, provided no contradiction to the teaching of the independent claims results.

LIST OF REFERENCE SIGNS

[0056] 1 open-end spinning device
2 open-end spinning machine
3 spinning rotor
4 rotor cup
5 rotor shaft
6 rotor housing
7 drive housing
8 individual drive
9 opening roller
10 receptacle
11 cover element
12 machine frame
13 spacer bush
14 frame
15 bearing point
16 magnetic bearing assembly
17 front radial bearing
18 rear radial bearing
19 axial bearing
20 swivel axis
21 opening roller housing
22 stop
23 positioning device
24 plastic coating
25 fiber material
26 thread
27 take-off device
28 winding device
29 package
30 suction connection
31 suction channel
32 fastening bore
33 frame
34 workstation
35 control unit
36 extension
37 thread draw-off nozzle
38 tab
39 end area

40 O-ring

[0057] 41 positioning element