Title of Invention

SINGLE MOTOR DRIVE DRAWING SYSTEM

Abstract

The present invention relates to a drawing system (4) for a spinning machine (1), which is configured with a plurality of pairs of rollers, which in each case have a drivable lower roller (15A, 15B, 15C) and a corresponding freely rotatably mounted upper roller, the drawing system (4) having two drawing system workstations (14), wherein lower rollers (15A, 15B, 15C) which are spaced apart from one another and coaxially arranged are in each case freely rotatably mounted in pairs on an axle (20) and in that the axles (20) in their central region (22) extending between the lower rollers (15A, 15B, 15C) are configured in such a way that they can be easily fixed in corresponding receivers (19) of a carrier (18) of the drawing system (4) and can also easily be removed again therefrom.

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 DRAWING SYSTEM FOR A SPINNING MACHINE 2. APPLICANT(S) a) Name b) Nationality c) Address OERLIKON TEXTILE GMBH & CO. KG GERMAN Company 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 translation of certified German Priority claiming 10 2007 023 460.2 dated May 19,2007 thereof is correct and complete. Description The present invention relates to a drawing system for a spinning machine according to the preamble of claim 1. A drawing system with two drawing system workstations for an air spinning machine, which is configured with a plurality of pairs of rollers is known from DE 39 32 614 Al. The pairs of rollers in each case have a lower roller which can be driven by a single motor as well as a freely mounted upper roller. It can be seen from DE 39 32 614 Al that the lower rollers are arranged on a carrier of the drawing system, but it is not explained how these are mounted on the carrier. However, specifically the mounting of the lower rollers is a particular challenge with regard to the reconcilability of a stable reliable mounting, on the one hand, and a maintenance-friendly mounting in the sense of an easily accessible and easily replaceable arrangement of the lower rollers, on the other hand, in order to reduce the production costs of a drawing system. The object of the present invention is therefore to further develop a drawing system of the aforementioned type in such a way that it has an economical mounting, which is easy to maintain, of the lower rollers. This object is achieved according to the invention by a drawing system with the features mentioned in claim 1. Further advantageous embodiments of the invention are the subject of the subclaims. According to claim 1, it is proposed that lower rollers, which are spaced apart from one another and coaxially arranged, are freely rotatably mounted on an axle in pairs and in that the axles in their central region extending between the lower rollers are configured in such a way that they can easily be fixed in corresponding receivers of a carrier of the drawing system and can also easily be removed again therefrom. The freely rotatable mounting of the lower rollers according to the invention in pairs on axles allows the use of standardised bearing axles, such as are conventionally used for drawing system upper rollers of ring spinning machines. Because of their comparatively simple structural design, the degree of automation during their production and the high production piece numbers connected therewith, these are substantially more economical than the generally specially configured axles for mountings of drawing system lower rollers for spinning machines. Moreover, owing to their arrangement in the receiver of the carrier, a simpler exchangeability of the lower rollers when maintenance or repair is required is achieved. Thus, compared to a lower roller along the length of the machine as generally used in ring spinning machines, the exchanging of lower belts and lower rollers is simplified and becomes more economical as the exchange can be carried out without it being necessary to switch off a complete side of the machine, such as is necessary in ring spinning machines with lower rollers along the length of the machine. Advantageously, the lower rollers may in each case be coupled to a drive shaft of a single motor drive. The single motor drive allows independent activation of the two drawing system workstations of the drawing system with different drafts if the feed material introduced for processing necessitates this or yarns with a different degree of fineness are to be produced. In a further development of the invention, the lower rollers may have coupling attachment pieces to receive a drive shaft. The coupling attachment pieces allow simplified separation of the lower rollers from the drives in order to exchange them. The outlay for exchanging belts of the central roller cylinders is also reduced in the drawing system according to the invention by the simplified removal of the axle with the central roller cylinders arranged thereon. In addition, the configuration of the bearing axles of the lower rollers allows them to be pre-assembled in order to insert a complete lower roller unit, consisting of the pair of lower rollers and the bearing axle into the receiver of the carrier. In total, the outlay for assembly is reduced, the maintenance work being made more operator-friendly and quicker to carry out. In particular, the single motor drives of the lower rollers may be fastened to the carrier. Alternatively, to lock the single motor drives against rotation, fastening may take place on the machine frame or by means of a frame connecting the drives of a drawing system workstation to one another. According to an alternative configuration, the lower rollers may in each case have a belt pulley, by means of which they can be driven independently of one another. The carrier may preferably have clamping devices matched to the central region of the axles to receive them. These clamping devices are used to fasten the lower roller unit and to receive the loads applied by the upper rollers to the lower rollers during operation of the drawing system if the upper rollers are pressed against the lower rollers by means of a load carrier. The invention will be described in more detail below with the aid of an embodiment shown in the drawings, in which: Fig. 1 shows a simplified view of an air spinning machine; Fig. 2 shows a schematic partial sectional view from above of a drawing system, only lower rollers being shown; Fig. 3 shows a schematic partial sectional view of a lower roller unit. The drawing system according to the invention will be described below with the aid of an air spinning machine 1, it also being possible to use the drawing system on a ring spinning machine, however. The air spinning machine 1 shown in Fig. 1 has a large number of spinning stations 2 arranged in a row next to one another. Each spinning station 2 comprises a fibre band source configured as a supply bobbin 3, from which a fibre band is supplied to a drawing system 4, a spinning device 5, a pair 6 of take-off rollers, a yarn clearer 7, a thread displacement mechanism 8 and a take-up bobbin configured as a cross-wound bobbin 9. A service carriage 10 can be moved along the spinning stations 2, on rails 11,12. A drive unit 13 is arranged at one end of the air spinning machine 1. Fig. 2 shows a schematic view of the drawing system 4 in a partial section with two drawing system workstations 14. The drawing system 4 comprises a carrier 18, on which a plurality of pairs of rollers is arranged for each drawing system workstation 14. The pairs of rollers consist of drivable lower rollers 15A, 15B, 15C and corresponding freely rotatably mounted upper rollers. The lower rollers 15A, 15B, 15C are in each case driven by single motor drives 16. The upper rollers are pressed by a weighting arm against the corresponding lower rollers 15A, 15B, 15C and driven thereby by friction. To drive the lower rollers 15A, 15B, 15C, theses are connected to the single motor drives 16 by means of coupling attachment pieces 17. Alternatively, the lower rollers 15A, 15B, 15C may have belt pulleys, by means of which these can be driven independently of one another. Fig. 3 shows a schematic partial sectional view of a lower roller unit. The lower roller unit consists of lower rollers 15A which are spaced apart in pairs, coaxially arranged and which are in each case freely rotatably mounted on an axle 20. The axle 20 has a central region 22, which has a reduced diameter compared to the end regions 21 being used to receive the lower rollers 15A. The central region 22 of the axle 20 is configured in such a way that the lower roller unit can easily be fixed in a receiver 19 of the carrier 18 of the drawing system 4 and can also be easily removed again therefrom. The receiver 19 is arranged coaxially with respect to the longitudinal axis of the axle 20 to be mounted on the carrier 18 and, when the lower roller unit is in the assembled position, encloses it in a positive manner. The axle 20 is fixed in a clamping manner in the receiver 19 so it can be easily fixed and also easily removed again therefrom. The freely rotatable mounting of the lower rollers 15A is achieved by roller bearings, in particular needle roller bearings as these are distinguished by a small external diameter. The connection to the single motor drives takes place by means of coupling attachment pieces 17, as indicated in Fig. 2 or by bores provided on the lower rollers 15A, by means of which the lower rollers 15A are attached to the drive shaft of the respective drive 16. CLAIM: 1. Drawing system (4) for a spinning machine (1), which is configured with a plurality of pairs of rollers, which in each case have a drivable lower roller (15A, 15B, 15C) and a corresponding freely rotatably mounted upper roller, the drawing system (4) having two drawing system workstations (14), characterised in that lower rollers (15A, 15B, 15C) which are spaced apart from one another and coaxially arranged are in each case freely rotatably mounted in pairs on an axle (20) and in that the axles (20) in their central region (22) extending between the lower rollers (15A, 15B, 15C) are configured in such a way that they can be easily fixed in corresponding receivers (19) of a carrier (18) of the drawing system (4) and can also easily be removed again therefrom. 2. Drawing system (4) according to claim 1, characterised in that the lower rollers (15A, 15B, 15C) are in each case coupled to a drive shaft of a single motor drive (16). 3. Drawing system (4) according to claim 2, characterised in that the lower rollers (15A, 15B, 15C) have coupling attachment pieces (17) to receive a drive shaft. 4. Drawing system (4) according to either of claims 2 or 3, characterised in that the single motor drives (16) of the lower rollers (15A, 15B, 15C) are fastened to the carrier (18). 5. Drawing system (4) according to claims 1, characterised in that the lower rollers (15A, 15B, 15C) in each case have a belt pulley, by means of which they can be driven independently of one another. 6. Drawing system (4) according to any one of claims 1 to 5, characterised in that the carrier (18) has clamping devices matched to the central region (22) of the axles (20) to receive them. ABSTRACT The present invention relates to a drawing system (4) for a spinning machine (1), which is configured with a plurality of pairs of rollers, which in each case have a drivable lower roller (15A, 15B, 15C) and a corresponding freely rotatably mounted upper roller, the drawing system (4) having two drawing system workstations (14), wherein lower rollers (15A, 15B, 15C) which are spaced apart from one another and coaxially arranged are in each case freely rotatably mounted in pairs on an axle (20) and in that the axles (20) in their central region (22) extending between the lower rollers (15A, 15B, 15C) are configured in such a way that they can be easily fixed in corresponding receivers (19) of a carrier (18) of the drawing system (4) and can also easily be removed again therefrom. To, The Controller of Patents, The Patent Office, Mumbai

Documents:

14647-FORM 13.pdf

14647-HER DRAW.pdf

859-MUM-2008-ABSTRACT(15-4-2014).pdf

859-mum-2008-abstract.doc

859-mum-2008-abstract.pdf

859-MUM-2008-CANCELLED PAGES(23-4-2012).pdf

859-MUM-2008-CLAIMS(AMENDED)-(15-4-2014).pdf

859-MUM-2008-CLAIMS(AMENDED)-(23-4-2012).pdf

859-MUM-2008-CLAIMS(MARKED COPY)-(23-4-2012).pdf

859-mum-2008-claims.doc

859-mum-2008-claims.pdf

859-mum-2008-correspondence(13-5-2008).pdf

859-MUM-2008-CORRESPONDENCE(23-4-2012).pdf

859-MUM-2008-CORRESPONDENCE(5-12-2013).pdf

859-MUM-2008-CORRESPONDENCE(5-3-2010).pdf

859-mum-2008-correspondence-received.pdf

859-mum-2008-description (complete).pdf

859-MUM-2008-DRAWING(15-4-2014).pdf

859-MUM-2008-DRAWING(23-4-2012).pdf

859-mum-2008-drawings.pdf

859-MUM-2008-ENGLISH TRANSLATION(15-4-2014).pdf

859-mum-2008-form 1(13-5-2008).pdf

859-MUM-2008-FORM 1(15-4-2014).pdf

859-MUM-2008-FORM 1(5-12-2013).pdf

859-MUM-2008-FORM 13(5-12-2013).pdf

859-MUM-2008-FORM 2(TITLE PAGE)-(15-4-2014).pdf

859-MUM-2008-FORM 2(TITLE PAGE)-(5-12-2013).pdf

859-MUM-2008-FORM 3(23-4-2012).pdf

859-MUM-2008-FORM 3(5-12-2013).pdf

859-MUM-2008-FORM 5(23-4-2012).pdf

859-MUM-2008-FORM 5(5-12-2013).pdf

859-mum-2008-form-1.pdf

859-mum-2008-form-18.pdf

859-mum-2008-form-2.doc

859-mum-2008-form-2.pdf

859-mum-2008-form-3.pdf

859-mum-2008-form-5.pdf

859-MUM-2008-GENERAL POWER OF ATTORNEY(15-4-2014).pdf

859-mum-2008-general power of attorney(16-4-2008).pdf

859-MUM-2008-GENERAL POWER OF ATTORNEY(5-12-2013).pdf

859-MUM-2008-MARKED COPY(15-4-2014).pdf

859-MUM-2008-OTHER DOCUMENT(15-4-2014).pdf

859-MUM-2008-OTHER DOCUMENT(5-12-2013).pdf

859-MUM-2008-PETITION UNDER RULE 137(23-4-2012).pdf

859-MUM-2008-REPLY TO EXAMINATION REPORT(23-4-2012).pdf

859-MUM-2008-REPLY TO HEARING(15-4-2014).pdf

859-MUM-2008-SPECIFICATION(AMENDED)-(15-4-2014).pdf

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