Title of Invention

THREAD DRAW-OFF DEVICE FOR A TEXTILE MACHINE PRODUCING CROSS-WOUND BOBBINS

Abstract

The invention relates to a thread draw-off device for a textile machine producing cross-wound bobbins, comprising a thread draw-off roller that can be driven by an individual motor and an associated pressure roller which is driven via frictional engagement. The thread draw-off roller (10) is provided with an axially symmetrical basic member (15) which is embodied such that an air flow cooling the drive unit (13) of the thread draw-off roller is generated when the thread draw-off roller (10) rotates.

Full Text

FORM 2 THE PATENT ACT 1970 (39 Of 1970) The Patents Rules, 2003 COMPLETE SPECIFICATION (See Section 10, and rule 13) 1. TITLE OF INVENTION THREAD DRAW-OFF DEVICE FOR A TEXTILE MACHINE PRODUCING CROSS-WOUND BOBBINS 2. APPLICANT(S) a) Name : OERLIKON TEXTILE GMBH & CO. KG b) Nationality : GERMAN Company c) Address : LANDGRAFENSTRASSE-45, 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/EP2006/006792 thereof is correct and complete. Description The invention relates to a thread draw-off device for a textile machine producing cross-wound bobbins according to the preamble of claim 1. Textile machines producing cross-wound bobbins, in particular open-end spinning machines, have, in the region of their workstations, a thread draw-off device in each case, which during spinning operation, draws the thread produced in a spinning mechanism out of the spinning mechanism and conveys it onward at a constant delivery speed in the direction of a winding device, where the thread is wound to form a cross-wound bobbin. The thread draw-off devices consist here either, as described, for example, in DE 44 32 240 Al or in DE 39 17 047 Al, of a drive shaft along the length of the machine, on which a pivotably mounted pressure roller rests in each case in the region of the workstations, or the thread draw-off devices in each case have a single motor drive. Such thread draw-off devices driven by a single motor are shown and described, for example, in DE 101 39 075 Al. These thread draw-off devices in each case have a relatively large thread draw-off roller which can be driven by a single motor and a significantly smaller, pivotably mounted pressure roller, which is entrained via frictional engagement by the thread draw-off roller during spinning operation. The thread draw-off roller, which can preferably be reversibly driven by a stepping motor, generally consists here of a rotationally symmetrical diecast or injection-* moulded member, in other words consists of a one-pieced cast member, which has an inner fastening hub, an annular outer periphery and a closed connecting disc located in between. The frequently poor cooling of the thread draw-off roller drives is disadvantageous in these thread draw-off devices which have proven successful per se. In other words, overheating of the thread draw-off roller drives may occur during the spinning process in these known thread draw-off devices, in particular in the case of unfavourable climatic conditions. Proceeding from the aforementioned prior art, the invention is based on the object of developing a thread draw-off device, in which adequate cooling of the thread draw-off roller drive is constantly ensured during spinning operation. This object is achieved according to the invention with a thread draw-off device, as described in claim 1. Advantageous configurations of the invention are the subject of the sub-claims. According to the invention, the thread draw-off roller has a rotationally symmetric basic member which is configured in such a way that, during rotation of the thread draw-off roller, an air flow is produced which cools the thread draw-off roller drive. In other words, the thread draw-off roller operates in the manner of a fan. In this * manner, the thread draw-off roller drive is reliably prevented from being able to overheat. The air flow produced during rotation of the thread draw-off roller, even in difficult climatic conditions, always ensures adequate cooling of the drive. As described in claim 2, it is provided in an advantageous embodiment that the basic member of the thread draw-off roller is configured in one piece, but very substantially open. This means that, during the rotation of the thread draw-off roller, an air flow is produced, which, flowing through the basic member, impinges on the housing of the thread draw-off roller drive. The heat dissipation thus taking place leads to a significant cooling of the corresponding drive. According to claim 3, the basic member of the thread draw-off roller has an outer bearing receiver for securing a thin-walled profiled metal ring, an inner hub for fastening the thread draw-off roller to the motor shaft of the thread draw-off roller drive and air blades arranged in between. The air blades, during the rotation of the thread draw-off roller, initiate a clear, very substantially uniform air flow in the direction of the associated drive. As shown in claim 4, the air blades are curved in the direction of rotation. In other words, the air blades have concavely curved faces which, when the regular thread draw-off takes place, are located at the front in the direction of rotation of the thread draw-off roller. These concavely curved faces of the air blades ensure that the air is continuously pressed in the direction of the drive, with the result that good cooling of the thread draw-off roller drive is ensured. As described in claim 5, the basic member of the thread draw-off roller is manufactured as an injection-moulded or diecast part. Such injection-moulded or diecast parts can be produced relatively economically and to fit very precisely, in particular when larger piece numbers are produced. The invention will be described in more detail below with the aid of an embodiment shown in the drawings, in which: Fig. 1 perspectively shows a workstation of a textile machine producing cross-wound bobbins, with a thread draw-off device driven by a single motor and a thread. draw-off roller according to the invention, Fig. 2 shows a perspective view of a thread draw-off roller according to the invention with a connected thread draw-off roller drive. Fig. 1 shows a perspective view of a workstation 1 of an open-end rotor spinning machine. Workstations 1 of this type have, as known and therefore only shown schematically, an open end spinning mechanism 2 for producing a thread 9 and a winding mechanism 3 on which the thread 9 is wound to form a cross-wound bobbin 8. The thread 9 produced in the open-end spinning mechanism 2 is drawn in this case from the open-end spinning mechanism 2 by a thread draw-off device 27, which has a thread draw-off roller 10 which can be driven by a single motor, and a pressure roller 14 which can be pivoted onto the thread draw-off roller 10 and is entrained via frictional engagement thereby. As indicated in Fig. 1, the thread 9 leaves the open-end spinning mechanism 2 through a so-called thread draw-off tube 21. Also arranged in the region of the open-end spinning mechanism 2 is a pivotably mounted auxiliary piecing member 16, which, after a thread break, takes over the thread 9 retrieved by a suction nozzle 4 from the cross-wound bobbin 8 and prepares the thread end for restarting the spinning. Furthermore, a thread stop motion 56, thread storage devices 7 or 12 and a waxing, device 5 are arranged downstream from the thread draw-off device 27 in the thread running direction. The thread storage device 12 is configured, in this case, as a negative pressure-loadable storage nozzle, while the storage device 7 is configured as a mechanical thread store. In other words, arranged between two stationary thread guide members is an adjustable thread guide member which, acted upon by a stepping motor 28, is movably arranged with respect to the thread running path. The winding device 3, as usual, consists of a creel 22 for the rotatable holding of a cross-wound bobbin 8, a bobbin drive drum 23 which can preferably be driven by a reversible single drive 19 and a thread traversing device 24, which is driven, for example, by a stepping motor 20. Upstream of the thread traversing device 24, a thread centring device in the form of a pivotably mounted centring plate 17 may also be arranged, which, if necessary, can be folded by a drive 18 in a defined manner into the regular thread running path. Furthermore, workstations 1 of this type, as already indicated above, have a suction nozzle 4, which can be adjusted in a defined manner by means of a stepping motor 6 between a thread receiving position located in the region of the winding device 3 and a thread transfer position located in the region of the spinning mechanism 2. The individual stepping motors of the workstation 1 are, as indicated in Fig. 1, connected via various control lines to a winding head computer 25. The thread draw-off device 27 consists, as already indicated above, substantially of a drivable thread draw-off roller 10, a pressure roller 14 which can be pivoted onto the thread draw-off roller 10 and is entrained thereby via frictional engagement and a thread draw-off roller drive 13. The thread draw-off roller drive 13 configured as a stepping motor is in turn connected via a control line 35 to a workstation computer 25. The thread draw-off device 27 ensures during regular spinning operation, the drawing-off of the spinning thread 9 from the open-end spinning mechanism 2 and also when spinning is restarted after a spinning operation, ensures the return of a prepared thread 9 into the open end spinning mechanism 2. As in particular shown in Fig. 2, the thread draw-off roller 10 consists of a rotationally symmetrical basic member 15 manufactured, for example, by the injection-moulding or diecasting method. The basic member 15 in this case has a circular, outer bearing receiver 29, on which a thin-walled metal ring 11 profiled, for example, by high pressure internal forming and which preferably consists of steel or a stainless steel alloy, can be secured. The thin-walled profiled metal ring 11, during the winding operation, is in contact with the thread 9 and in conjunction with the abutting pressure roller 14 ensures that, the thread 9 is drawn off continuously from the open-end spinning device 2. The basic member 15 furthermore has an inner hub 31, via which the thread draw-off roller 10 can be secured to the motor shaft 32 of the thread draw-off roller drive 13. Air blades 33, which operate in the manner of a fan 30 during the rotation of the thread draw-off roller 10, extend between the hub 31 and the bearing receiver 29. In other words, the air blades 33 initiate an air flow which cools the thread draw-off roller drive 13. As can also be seen from Fig. 2, the air blades 33 have faces, which are located at the front in relation to the direction R of rotation of the thread draw-off roller 10 and are concavely curved. WE CLAIM : 1. Thread draw-off device for a textile machine producing cross-wound bobbins with a thread draw-off roller that can be driven by a single motor and an associated pressure roller which is driven via frictional engagement, characterised in that the thread draw-off roller (10) has a rotationally symmetrical basic member (15) with devices (33), which, during the rotation of the thread draw-off roller (10) produce an air flow which cools the thread draw-off roller drive (13). 2. Thread draw-off device according to claim 1, characterised in that the basic member (15) of the thread draw-off roller (10) is configured in one piece but very substantially open. 3. Thread draw-off device according to claim 1, characterised in that the basic member (15) of the thread draw-off roller (10) has an outer, circular bearing receiver (29) for securing a thin-walled, profiled metal ring (11), an inner hub (31) for fastening the thread draw-off roller (10) to the motor shaft (32) of the thread draw-off roller drive (13) and air blades (33) arranged in between. 4. Thread draw-off device according to claim 3, characterised in that the air blades (33) are curved in the direction (R) of rotation. 5. Thread draw-off device according to claim 1, characterised in that the thread draw-off roller (10) is manufactured as an injection-moulded part or diecast part. ABSTRACT The invention relates to a thread draw-off device for a textile machine producing cross-wound bobbins, comprising a thread draw-off roller that can be driven by an individual motor and an associated pressure roller which is driven via frictional engagement. The thread draw-off roller (10) is provided with an axially symmetrical basic member (15) which is embodied such that an air flow cooling the drive unit (13) of the thread draw-off roller is generated when the thread draw-off roller (10) rotates. To, The Controller of Patents, The Patent Office, Mumbai [FIG. 2]

Documents:

391-MUMNP-2008-ABSTRACT(9-3-2012).pdf

391-MUMNP-2008-ABSTRACT(GRANTED)-(11-12-2012).pdf

391-mumnp-2008-abstract.doc

391-mumnp-2008-abstract.pdf

391-MUMNP-2008-CANCELLED PAGE(9-3-2012).pdf

391-MUMNP-2008-CLAIMS(AMENDED)-(9-3-2012).pdf

391-MUMNP-2008-CLAIMS(GRANTED)-(11-12-2012).pdf

391-mumnp-2008-claims.doc

391-mumnp-2008-claims.pdf

391-MUMNP-2008-CORRESPONDENCE(10-12-2012).pdf

391-mumnp-2008-correspondence(21-4-2008).pdf

391-MUMNP-2008-CORRESPONDENCE(9-3-2012).pdf

391-MUMNP-2008-CORRESPONDENCE(IPO)-(13-12-2012).pdf

391-mumnp-2008-correspondence-others.pdf

391-mumnp-2008-correspondence-received.pdf

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

391-MUMNP-2008-DESCRIPTION(GRANTED)-(11-12-2012).pdf

391-MUMNP-2008-DRAWING(GRANTED)-(11-12-2012).pdf

391-mumnp-2008-drawings.pdf

391-MUMNP-2008-ENGLISH TRANSLATION(10-12-2012).pdf

391-mumnp-2008-form 1(21-4-2008).pdf

391-MUMNP-2008-FORM 2(GRANTED)-(11-12-2012).pdf

391-mumnp-2008-form 2(title page)-(29-2-2008).pdf

391-MUMNP-2008-FORM 2(TITLE PAGE)-(GRANTED)-(11-12-2012).pdf

391-MUMNP-2008-FORM 3(9-3-2012).pdf

391-mumnp-2008-form-1.pdf

391-mumnp-2008-form-18.pdf

391-mumnp-2008-form-2.doc

391-mumnp-2008-form-2.pdf

391-mumnp-2008-form-26.pdf

391-mumnp-2008-form-3.pdf

391-mumnp-2008-form-5.pdf

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

391-mumnp-2008-form-pct-isa-220.pdf

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

391-MUMNP-2008-GENERAL POWER OF ATTORNEY(9-3-2012).pdf

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

391-MUMNP-2008-PETITION UNDER RULE-137(9-3-2012).pdf

391-MUMNP-2008-REPLY TO EXAMINATION REPORT(9-3-2012).pdf

391-MUMNP-2008-US DOCUMENT(9-3-2012).pdf

391-mumnp-2008-wo international publication report(29-2-2008).pdf

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