Title of Invention

OPEN-END SPINNING ROTOR FOR TEXTILE MACHINE PRODUCING CROSS-WOUND BOBBINS

Abstract The invention concerns an open-end spinning rotor for a textile machine producing cross-wound packages, comprising a rotor shaft(4) mounted rotatably via a magnetic bearing assembly and also a rotor cup (26) comprising a front-side rotor opening, a fibre slip wall (31) emanating from the rotor opening, a so-called rotor groove (33a) and also a rotor bottom (6) with a moulded-on connecting collar (7), the rotor cup (3) being connectable to the rotor shaft (4), via a connector (9) fixable in the connecting collar (7), to be nonrotating and if desired easily releasable. The invention provides that the rotor cup (26) is fabricated as a thin wall structure and formed such that the centre of gravity of the rotor cup (26) is disposed in a region (50B, 50D) which, viewed from the rotor opening (30), is behind the fibre slip wall (31).
Full Text FORM 2
THE PATENT ACT 1970
(39 of 1970)

The Patents Rules, 2003 COMPLETE SPECIFICATION
(See Section 10, and rule 13)
TITLE OF INVENTION
OPEN-END SPINNING ROTOR FOR TEXTILE MACHINE PRODUCING CROSS-WOUND
PACKAGES

APPLICANT(S)
a) Name
b) Nationality
c) Address

OERLIKON TEXTILE GMBH & CO. KG GERMAN Company LANDGRAFENS TRAS S E-4 5, D-41069 MOENCHENGLADBACH, GERMANY

3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed : -

ENGLISH TRANSLATION VARIFICATION
CERTIFICATE u/r. 20(3)(b)
I, Mr. HIRAL CHANDRAKANT JOSHI, an authorized agent for the applicant, OERLIKON TEXTILE GMBH & CO. KG do hereby verify that the content of English translated complete specification filed in pursuance of PCT International application No. PCT/EP2006/008907 thereof is correct and complete.


The invention relates to an open-end spinning rotor for a textile machine producing cross-wound bobbins with the features of the preamble of claim 1.
Open-end spinning rotors of this type are known, for example, from EP1156142 Bl. In these textile machines producing cross-wound bobbins, the spinning rotors are supported with their rotor shaft in each case in a magnetic bearing arrangement and driven by a single motor. The magnetic bearing arrangements of these textile machines in each case consist of a front and a rear bearing point, the bearing points in turn having axially opposing permanent magnetic rings. One of these permanent magnetic rings is fixed to the stator, while the other permanent magnetic ring revolves with the rotor shaft of the spinning rotor.
As the installation or disassembly of the rotor shaft of spinning rotors mounted in this manner requires a not inconsiderable outlay for assembly, the rotor cup, in these spinning rotors, is releasably connected in each case to the rotor shaft. In other words, if necessary, the rotor cup can be exchanged, for example in the case of wear or in the event of a batch change, without the rotor shaft also having to be disassembled.
The releasable connection of the rotor cup to the rotor shaft takes place here by means of a coupling device, which has a magnet mechanism for the axially locking of the rotor cup to the rotor shaft as well as a mechanical anti-rotation device.
The rotor cups of these known spinning rotors are configured here such that they have different, relatively high wall thicknesses in their different regions, for example on the fibre slip wall, on the rotor groove and on the rotor base. In particular the high wall thickness in the region of the rotor base of the rotor cup leads to these spinning rotors not only having a relatively large moment of inertia but also to the centre of gravity of these spinning rotors being located in total relatively far to the front, in the region of the front bearing point of the magnetic bearing arrangement.
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In particular in the case of such magnetically mounted spinning rotors, it is, however, unfavourable in terms of control technology with regard to the positional fixing of the spinning rotor if the centre of gravity of the spinning rotor is arranged too close in the region of one of the bearing points, in the present case in the region of the front bearing point of the permanent bearing arrangement.
Furthermore, open-end spinning devices are known from DE 199 10 277 Al, the spinning rotors of which in each case are supported by a rotor shaft on a support disc mounting, and the rotor cups of which are distinguished by a streamlined contour and a low weight. The spinning rotor is, however, configured in one part here, in other words, a separation of the rotor cup and rotor shaft is hardly possible without the rotor cup and/or the rotor shaft being damaged.
Proceeding from the aforementioned prior art, the invention is based on the object of providing open-end spinning rotors, which are in each case supported in a magnetic bearing arrangement and are suitable for high rotational speeds, and have a rotor cup which can be exchangeably fixed on the rotor shaft.
Moreover, it is to be ensured that the outlay in terms of control technology for positional fixing of these spinning rotors during spinning operation is kept within reasonable limits.
This object is achieved according to the invention by open-end spinning rotors, which have the features described in claim 1.
Advantageous configurations of the invention are the subject of the sub-claims.
The configuration according to the invention of an open-end spinning rotor with a rotor cup, which is produced as a thin-walled construction and is configured in such
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a way that the centre of gravity of the rotor cup is arranged in a region arranged behind the fibre slip wall, has the advantage that, on the one hand, the moment of inertia of the spinning rotor is minimised and that, on the other hand, the centre of gravity of the rotor cup and therefore also the centre of gravity of the spinning rotor in total moves to the rear, in other words, into a region between the bearing points of the magnetic bearing arrangement. The centre of gravity of the magnetically mounted spinning rotor according to the invention is thereby positioned in such a way that the front magnetic bearing point is stressed slightly less and therefore the two bearing points of the magnetic bearing arrangements are loaded more uniformly.
An arrangement of the centre of gravity of the spinning rotor of this type, achieved in particular by the configuration of the rotor cup, simplifies the activation of the magnetic bearing arrangement considerably and this has a positive effect on the costs of a control of this type and also on the running reliability of the spinning rotor during spinning operation.
The minimisation of the moment of inertia of the spinning rotor achieved by the thin-walled construction of the rotor cup also has an advantageous effect both on the run-up time and on the braking time of the spinning rotor.
As described in claim 2, it is provided in a first, advantageous embodiment that the rotor cup has a rotor groove with a round groove base and a short radially arranged support in the region of the rotor base. A shape of this type of the rotor groove can achieve a mass distribution of the rotor cup, which in conjunction with a respective diameter of the rotor groove ensures that the centre of gravity of the rotor cup is always in a region which, at a spacing from the rotor groove, lies at the level of the inner region of the rotor base or at the level of the connection collar.
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In the embodiment described in claim 2 of a rotor cup, the centre of gravity of the rotor cup is successfully placed close to the region of the connection collar or in the region of the connection collar of the rotor cup. The spacing of the stop edge of the rotor cup is advantageously, as described in claim 3, between 5.75 mm and 7.06 mm.
In the case of a rotor cup, the rotor groove of which has a pointed groove base and relatively long, radially arranged support in the region of the rotor base, the centre of gravity of the rotor cup, as described in claim 4, is in a region which, beginning at the rotor groove, is arranged at the level of the rotor base or at the level of the connection collar.
As described in claim 5, the centre of gravity of the rotor cup in the embodiment of the rotor cup described in claim 4, has a spacing between 5.88 mm and 7.51 mm from a stop edge of the rotor cup.
As described in claim 6, the rotor cup has a virtually constant wall thickness of, as described in claim 7, below 1 mm in the region of the fibre slip wall, the rotor groove and the rotor base. Spinning rotors configured in this manner are produced by means of special automatic lathes and are not only distinguished, as already mentioned above, in that they are relatively easy to accelerate and decelerate because of their low moment of inertia, and have a centre of gravity which is located relatively far to the rear and therefore advantageous, but also have a very precise concentric running. This means that because of the extremely precise concentric running and their relatively low weight, spinning rotors of this type are predestined for rotational speeds which previously did not seem achievable.
Further details of the invention can be inferred from an embodiment described below with the aid of the drawings, in which:
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Fig. 1 shows a lateral view of an open-end spinning device with a spinning rotor according to the invention, which is supported with its rotor shaft in a magnetic bearing arrangement and is driven by a single motor, the rotor cup of the spinning rotor being easily releasably connected to the rotor shaft via a coupling device,
Fig. 2 shows a perspective view of the spinning rotor according to the invention, the rotor cup with its connection bolt being shown separately from the rotor shaft of the spinning rotor,
Fig. 3 shows a first embodiment of a rotor cup with a connection bolt fixed in the connection collar of the rotor cup,
Fig. 4 shows a further embodiment of a rotor cup, also with a connection bolt fixed in the connection collar of the rotor cup.
Fig. 1 shows an open-end spinning device 1 with a spinning rotor 3 which is magnetically mounted and driven by a single motor.
Open-end spinning devices 1 of this type are known and described in relative detail, for example, in EP 0 972 868 A2. Such open-end spinning devices 1 in each case have a rotor housing 2, in which the rotor cup 26 of a spinning rotor 3 revolves at a high rotational speed.
The spinning rotor 3 is in this case preferably driven by an electric motor single drive 18 and is supported with its rotor shaft 4 in the front 27 and rear 28 bearing points of a magnetic bearing arrangement 5, which position the spinning rotor 3 both in the radial and in the axial direction.
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The rotor housing 2 which is open per se to the front is closed during the spinning operation via a pivotably mounted cover element 8 and connected via a corresponding pneumatic line 10 to a negative pressure source 11, which produces the negative spinning pressure which is necessary in the rotor housing 2. A so-called channel plate adapter 12 is let into the cover element 8 and has the thread take-off nozzle 13 and the opening region of the fibre guide channel 14. A thread take-off tube 15, as usual, adjoins the thread take-off nozzle 13 here. An opening roller housing 17 is also fixed on the cover element 8, which is mounted so as to be rotatable to a limited extent about a pivot axis 16. Furthermore, the cover element 8 has rear bearing brackets 19, 20 for mounting an opening roller 21 or a fibre band draw-in cylinder 22. The opening roller 21 is driven here in the region of its wharve 23 by a circulating tangential belt 24 along the length of the machine, while the drive (not shown) of the fibre band draw-in cylinder 22 is preferably carried out via a worm gear arrangement which is switched to a drive shaft 25 along the length of the machine.
In an alternative embodiment, the opening roller 21 and/or the fibre band draw-in cylinder 22 can obviously also be driven in each case by a single drive, for example a stepping motor.
As shown, in particular, in Fig. 2, the rotor cup 26 of the spinning rotor 3 is connected, if necessary easily releasably, to the rotor shaft 4 of the spinning rotor 3 via a coupling device characterised as a whole by the reference numeral 29. The coupling device 29 in this case consists, for example, of a magnet mechanism for the axial fixing of the components and a mechanical anti-rotation device. In other words, the rotor cup 26 configured as a thin-walled construction, in the region of its rotor base 6, has a connection collar 7 with a bore 41, in which, preferably by means of a press fit, a connection bolt 9 is fixed. The connection bolt 9 is in this case preferably produced, at least in its end region, from a ferromagnetic material and divided into two approximately equally long portions, preferably a cylindrical guide portion 38
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and a portion configured as an external polygon 36. As also indicated in Fig. 2, a receiving sleeve 34, which apart from the rotor-side permanent magnetic ring 39 of the front bearing point 27 of the magnetic bearing arrangement 5 also has an internal polygon 35 arranged so as to be resistant to rotation and a permanent magnetic insert 35, is fixed in the tubular rotor shaft 4, preferably also by means of a press fit. The receiving sleeve 35 furthermore has a cylindrical bore 37, which, in the installed state, corresponds with the guide portion 38 of the connection bolt 9.
The rotor cups 36 of the spinning rotor 3 shown in Figs. 3 and 4 also, as usual, have a rotor opening 30 arranged at the front, a fibre slip wall 31 beginning at the rotor opening 30 and diverging to the rear, a rotor groove 33A or 33B and a rotor base 6 with a moulded-on connection collar 7. A connection bolt 9 can be fixed in a bore 41 of the connection collar 7 here, preferably by means of a press fit.
The rotor cups 26 are configured as thin-walled components, which have a virtually constant wall thickness WS in the region of the fibre slip wall 31, the rotor groove 33 and the rotor base 6. The rotor cup 26 of Fig. 3 substantially differs from the rotor cup 26 according to Fig. 4 by the shape of its rotor groove 33A or 33B.
In other words, the rotor cup 26 shown in Fig. 4, a so-called T-rotor, has a pointed rotor groove 33B with a relatively long, radially arranged support 40B in the region of the rotor base 6. Rotor cups 26 configured in this manner are relatively insensitive to deposits of dirt. Moreover, yarns can be produced with rotor cups 26 of this type which are similar to ring-spun yarn with respect to the yarri structure and the yarn volume. As indicated in Fig. 4, the centre of gravity of rotor cups 26 of this type, depending on the respective rotor diameter D, beginning at the rotor groove 33B, lies at the level of the rotor base 6 in the region of the portion 50D. The spacing d or di of the centre of gravity of the rotor cup 26 from the stop edge 60 of the rotor cup 26 in these rotors is preferably between 5.88 mm and 7.51 mm.
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The rotor cup 26 shown in Fig. 3, a so-called G-rotor, has a less pointed rotor groove 33A compared to a T-rotor, which rotor groove also has only a relatively short radially arranged support 40A. Rotor cups 26 configured in this manner are significantly more sensitive to deposits of dirt, but allow the production of a voluminous, soft yarn. As can be seen from Fig. 3, in the case of rotor cups 26 of this type, the centre of gravity, also depending on the respective rotor diameter D, lies slightly spaced apart from the rotor groove 33A at the level of the inner region of the rotor base 6, in other words, roughly at the level of the portion designated 50B in Fig. 3. In other words, in these G-rotors, the centre of gravity of the rotor cup lies at a spacing b or bi from a stop edge of the rotor cup, which is between 5.75 mm and 7.06 mm.
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WE CLAIM:
1. Open-end spinning rotor for a textile machine producing cross-wound bobbins comprising a rotor shaft rotatably mounted by means of a magnetic bearing arrangement, as well as a rotor cup, which has a front rotor opening, a fibre slip wall emanating from the rotor opening, a so-called rotor groove and a rotor base with a moulded-on connection collar, the rotor cup being connectable in a manner resistant to rotation, if necessary easily releasably, to the rotor shaft via a connection shaft which can be fixed in the connection collar, characterised in that the rotor cup (26) is produced as a thin-walled construction and is configured in such a way that the centre of gravity of the rotor cup (26) is arranged in a region (50B, 50D) which is behind the fibre slip wall (31), viewed from the rotor opening (30).
2. Open-end spinning rotor according to claim 1, characterised in that the rotor cup (26) has a rotor groove (33A) with a round groove base and a short, radially arranged support (40A) in the region of the rotor base (6), the form of the rotor groove (33A) in connection with the diameter (D) of the rotor groove (33A) ensuring that the centre of gravity of the rotor cup (26) lies in a region (50B) which is arranged spaced apart from the rotor groove (33A) at the level of the inner region of the rotor base (6).
3. Open-end spinning rotor according to claim 2, characterised in that the centre of gravity of the rotor cup (26) lies in a region (50B), which has a spacing (b or bi) between 5.75 mm and 7.06 mm from a stop edge (60) of the rotor cup (26).
4. Open-end spinning rotor according to claim 1, characterised in that the rotor cup (26) has a rotor groove (33B) with a relatively pointed groove base and a relatively long, radially arranged support (40B) in the region of the rotor base (6), the shape of the rotor groove (33B) in connection with the diameter (D) of the rotor groove (33B) ensuring that the centre of gravity of the rotor cup (26)
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is in a region (50D) which, starting at the rotor groove (33B), is arranged at the level of the rotor base (6).
5. Open-end spinning rotor according to claim 4, characterised in that the centre of gravity of the rotor cup (26) is in a region (50D), which has spacing (d or di) between 5.88 mm and 7.51 mm from a stop edge (60) of the rotor cup (26).
6. Open-end spinning rotor according to any one of the preceding claims, characterised in that the rotor cup (26) in the region of the fibre slip wall (31), the rotor groove (33A, 33B) and the rotor base (6), has a virtually constant wall thickness (WS).
7. Open-end spinning rotor according to claim 6, characterised in that the wall thickness (WS) of the rotor cup (26) is below 1 mm.

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ABSTRACT
The invention concerns an open-end spinning rotor for a textile machine producing cross-wound packages, comprising a rotor shaft (4) mounted rotatably via a magnetic bearing assembly and also a rotor cup (26) comprising a front-side rotor opening, a fibre slip wall (31) emanating from the rotor opening, a so-called rotor groove (33a) and also a rotor bottom (6) with a moulded-on connecting collar (7), the rotor cup (3) being connectable to the rotor shaft (4), via a connector (9) fixable in the connecting collar (7), to be nonrotating and if desired easily releasable. The invention provides that the rotor cup (26) is fabricated as a thin wall structure and formed such that the centre of gravity of the rotor cup (26) is disposed in a region (50B, 50D) which, viewed form the rotor opening (30), is behind the fibre slip wall (31).
To,
The Controller of Patents,
The Patent Office,
Mumbai
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(Fig. 1)


Documents:

899-MUMNP-2008-ABSTRACT(14-3-2014).pdf

899-MUMNP-2008-ABSTRACT(18-6-2012).pdf

899-mumnp-2008-abstract.doc

899-mumnp-2008-abstract.pdf

899-MUMNP-2008-ASSIGNMENT(30-10-2013).pdf

899-MUMNP-2008-CANCELLED PAGE(18-6-2012).pdf

899-MUMNP-2008-CLAIMS(AMENDED)-(14-3-2014).pdf

899-MUMNP-2008-CLAIMS(AMENDED)-(18-6-2012).pdf

899-MUMNP-2008-CLAIMS(MARKED COPY)-(14-3-2014).pdf

899-MUMNP-2008-CLAIMS(MARKED COPY)-(18-6-2012).pdf

899-mumnp-2008-claims.doc

899-mumnp-2008-claims.pdf

899-MUMNP-2008-CORRESPONDENCE(18-6-2012).pdf

899-MUMNP-2008-CORRESPONDENCE(25-10-2013).pdf

899-MUMNP-2008-CORRESPONDENCE(30-10-2013).pdf

899-mumnp-2008-correspondence(5-6-2008).pdf

899-mumnp-2008-correspondence-others.pdf

899-mumnp-2008-correspondence-received.pdf

899-mumnp-2008-description (complete).pdf

899-MUMNP-2008-DRAWING(18-6-2012).pdf

899-mumnp-2008-drawings.pdf

899-MUMNP-2008-ENGLISH TRANSLATION(14-3-2014).pdf

899-MUMNP-2008-ENGLISH TRANSLATION(18-6-2012).pdf

899-MUMNP-2008-FORM 1(14-3-2014).tif

899-MUMNP-2008-FORM 1(25-10-2013).pdf

899-MUMNP-2008-FORM 1(30-10-2013).pdf

899-mumnp-2008-form 1(5-6-2008).pdf

899-MUMNP-2008-FORM 13(25-10-2013).pdf

899-MUMNP-2008-FORM 2(TITLE PAGE)-(14-3-2014).pdf

899-MUMNP-2008-FORM 2(TITLE PAGE)-(25-10-2013).pdf

899-MUMNP-2008-FORM 2(TITLE PAGE)-(30-10-2013).pdf

899-mumnp-2008-form 2(title page)-(5-5-2008).pdf

899-MUMNP-2008-FORM 26(14-3-2014).pdf

899-MUMNP-2008-FORM 26(30-10-2013).pdf

899-MUMNP-2008-FORM 3(18-6-2012).pdf

899-MUMNP-2008-FORM 3(25-10-2013).pdf

899-MUMNP-2008-FORM 3(30-10-2013).pdf

899-MUMNP-2008-FORM 5(18-6-2012).pdf

899-MUMNP-2008-FORM 5(25-10-2013).pdf

899-MUMNP-2008-FORM 5(30-10-2013).pdf

899-MUMNP-2008-FORM 6(30-10-2013).pdf

899-MUMNP-2008-FORM PCT-IB-304(18-6-2012).pdf

899-mumnp-2008-form-1.pdf

899-mumnp-2008-form-18.pdf

899-mumnp-2008-form-2.doc

899-mumnp-2008-form-2.pdf

899-mumnp-2008-form-26.pdf

899-mumnp-2008-form-3.pdf

899-mumnp-2008-form-5.pdf

899-mumnp-2008-form-pct-ib-306.pdf

899-mumnp-2008-form-pct-isa-237.pdf

899-MUMNP-2008-GENERAL POWER OF ATTORNEY(25-10-2013).pdf

899-MUMNP-2008-OTHER DOCUMENT(14-3-2014).pdf

899-MUMNP-2008-OTHER DOCUMENT(25-10-2013).pdf

899-mumnp-2008-pct-search report.pdf

899-MUMNP-2008-PETITION UNDER RULE-137(18-6-2012).pdf

899-MUMNP-2008-REPLY TO EXAMINATION REPORT(18-6-2012).pdf

899-MUMNP-2008-REPLY TO HEARING(14-3-2014).pdf

899-mumnp-2008-wo international publication report(5-5-2008).pdf

abstract1.jpg


Patent Number 259697
Indian Patent Application Number 899/MUMNP/2008
PG Journal Number 13/2014
Publication Date 28-Mar-2014
Grant Date 24-Mar-2014
Date of Filing 05-May-2008
Name of Patentee OERLIKON TEXTILE GMBH & CO. KG.
Applicant Address LEVERKUSER STRASSE 65, D-42897 REMSCHEID, GERMANY
Inventors:
# Inventor's Name Inventor's Address
1 WASSENHOVEN, HEINZ-GEORG JOHANNES-BUECHNER-STRASSE 3, 41065 MOENCHENGLADBACH.
2 RIEDE, BRIGITTE TROMPETERALLEE 67, 41189 MOENCHENGLADBACH.
PCT International Classification Number D01H4/10
PCT International Application Number PCT/EP2006/008907
PCT International Filing date 2006-09-13
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 102005062196.1 2005-12-23 Germany