Title of Invention

METHOD FOR PRODUCING A DYE BOBBIN AND A DEVICE FOR WINDING ON A CONTINUOUSLY SUPPLIED THREAD

Abstract

The present invention relates to a method for producing a dye bobbin, in which a continuously supplied thread (16) is wound on a winding head of a textile machine having a plurality of winding heads (2) on a tube to form a cross-wound bobbin (5), which is then subjected to a dyeing process, wherein to protect the thread layers to be wound on, a cushioning winding is firstly applied to the tube, which covers the tube surface over the traversing region, and in that after the winding on of the cushioning winding, to wind on the thread (16) to form the cross-wound bobbin (5), a switch is made to a different winding method, wherein the cushioning winding is wound on at a constant winding ratio.

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 METHOD FOR PRODUCING A DYE BOBBIN AND A DEVICE FOR WINDING ON A CONTINUOUSLY SUPPLIED THREAD APPLICANT(S) a) Name b) Nationality c) Address SAURER GMBH & CO., KG. GERMAN Company LANDGRAFENSTRASSE 45, D-41069 MONCHENGLADBACH, GERMANY PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner in which it is to be performed : - Description: The present invention relates to a method for producing a dye bobbin according tO the preamble of claim 1 and a device for carrying out the method according to the preamble of claim 8. When producing dye bobbins, a thread is wound on a tube to form a cross-wound bobbin, which is fed to a subsequent dyeing process. To carry out the dyeing process, in the production of cross-wound bobbins, tubes are used, the outer surface of which is configured so as to be permeable to a dyeing liquid. For this purpose, the outer surface may be provided with holes or have a grid structure. Tubes of this type generally consist of a rust-proof metal, so-called spring wire tubes, or of a plastics material. When carrying out the dyeing process, after the dyeing process, inter alia, gloss and pressure points occur or uneven dye distribution occurs on the inner thread layers of a dye bobbin. To avoid these defects, paper filters or nonwovens, so-called sleeves are pulled onto the tubes, or thread layers wound onto the tubes with random winding, so-called cushioning windings are used as protection for the inner thread layers. In addition to protecting the inner thread layers on the dye bobbin, paper filters, nonwovens or the wound-on yarn layers are also used for support when starting the winding process. The winding heads can be operated at a high rotational speed when starting up the winding, so operation can take place at these at a relatively high winding speed and also a relatively high winding acceleration. The sleeves or cushioning windings are also used to avoid damage to the inner thread layers during the compression of the tubes during dyeing. This is necessary, in particular when using spring wire tubes but also in the case of tubes made of plastics material, as in the case of these, the lack of the sleeve even during the winding process leads to the thread that is being wound on being already destroyed during the run up of the dye bobbin. 2 From DE195 20 957 Al it is known that when placing a thread on an empty bobbin, initially some thread layers are wound on as so-called cushioning winding. On reaching a specific layer thickness of the cushioning winding, a switch is made to a preferred winding method in order to produce the actual dye bobbin. The cushioning winding is wound on, as already stated, with random winding and this leads to the cushioning windings being produced with a relatively large layer thickness as the complete closure of the rhombi being formed on the tube during transfer of the thread requires a larger thread length until the tube surface is completely covered over the traversing region of the thread to protect the inner thread layers. This leads to high material losses when the cushioning windings have to be discarded in a subsequent further processing of the dye bobbin. In comparison, the use of economical paper filters or nonwovens has the drawback that the application on the tubes represents a considerable manual effort. A further drawback in the use of paper filters and nonwovens is the risk of extraneous fibre contamination of the thread, which is problematical, in particular when dyeing the cross-wound bobbin. The invention is based on the object of providing a method, which allows the protective effect of a cushioning winding with simultaneous reduction of the thread waste and a device for carrying out the method. This object is achieved with regard to the method by the characterising features of claim 1 and with regard to the device by the characterising features of claim 8. According to claim 1, it is provided that the cushioning winding is wound on at a constant winding ratio. The invention is based on the discovery that the closed dense structure according to the invention of the precision winding already adequately protects the main winding located thereabove after a short time, but above all also ensures a very uniform penetration and distribution of the dyeing liquor because of the uniform distribution of the pores formed by the winding. If this layer is then 3 discarded, the thread length not used for the intended purpose is reduced compared to the prior art. The cushioning winding used in particular to protect the inner thread layers is placed on in such a way that rhombi produced during winding are systematically closed virtually completely. With a suitable selection of the constant winding ratio, which in particular leads to a closed precision winding, this is achieved with a reduced thread length compared to the prior art. To complete the winding on of the cushioning winding as quickly as possible and to minimise the layer thickness required to form the cushioning winding and therefore the thread length to be applied, the latter can be wound on at a high winding ratio, in particular a winding ratio of at least 5, in particular between 5 and 15 and a small thread spacing. In particular, a high winding ratio leads to the avoidance of a further drawback of the cushioning winding applied according to the prior art with random winding on spring wire tubes. In this case, the smooth surface of the wire structure of the spring wire tube also causes the thread to be applied as a cushioning winding to be deposited non-uniformly. This leads to a migration of the thread toward the tube centre in which a bead forms. The high winding ratio used according to the invention when forming the cushioning winding brings about a depositing of the thread on the tube such that the axial force component of the thread is reduced. This can lead to a reduction in the migration of the thread deposited as a cushioning winding toward the tube centre, in particular when using a spring wire tube. The precision of the thread depositing for the cushioning winding can also be assisted by a lower winding speed adjusted in a targeted manner during the build up of the cushioning winding. In particular, after winding on the cushioning winding, a switch can be made to random winding as the winding method. The switch to the winding method of random winding has the advantage compared to precision winding that a cross- 4 wound bobbin is produced with a smaller bobbin density which is better suited to the subsequent dyeing process than a cross-wound bobbin produced continuously with precision or step precision winding. The cushioning winding creates suitable preconditions for starting to wind the thread, which may possibly become necessary after the formation of the cushioning winding if a severing of the thread layers is previously carried out at the transition from the cushioning winding to the thread layers subsequently wound on to form the cross-wound bobbin. Advantageously, to simplify the method and to improve the handleability of the dye bobbin it may be provided that the thread is severed at the transition of the thread layers from the cushioning winding to the cross-wound bobbin to be wound on with random winding. This allows the supplying of the cushioning winding remaining on the tube to a further processing operation, which only places low quality demands on the thread to be processed. Furthermore, the thread end can be placed onto the cushioning winding after the severing. The thread end can be wound onto the cushioning winding in this case with or without a thread reserve. In the preferred development of the method, the thread can briefly be wound beyond the transfer width of the tube, so a thread back-off is produced located next to the cushioning winding. The winding start, which becomes necessary because of a severing of the thread layers at the transition of the cushioning winding from the subsequently wound on thread layers of the dye bobbin, is therefore dispensed with. Instead, the thread back-off located next to the cushioning winding can be severed before the removal of the dye bobbins by the operating personnel, so the cushioning winding remains on the tube. As an alternative, the thread layers to be wound onto the cushioning winding can be wound on without a prior severing of the thread layers at the transition. This allows the further use of the layers wound on previously as a cushioning winding in the 5 subsequent processing of the dye bobbin. The thread waste can be further reduced in this manner. After completing the formation of the cushioning winding, a switch is made to a different method which can be predetermined for the production of the dye bobbin, in particular random winding. This alternative can be preferably used in such cases in which the qualitative requirement of the thread layers forming the cushioning winding is low in the subsequent further processing of the dye bobbin. According to claim 8 it is proposed that the device has a control mechanism, which is set up to control the drives in such a way that firstly a cushioning winding is wound onto the tube at a constant winding ratio and in that, after the winding of the cushioning winding, a switch is made to a different winding method. The invention will be described in more detail below with the aid of an embodiment shown in the drawings, in which: Fig. 1 schematically shows a winding head of a textile machine producing cross-wound bobbins; Fig. 2 schematically shows a view of a thread traversing mechanism according to Fig. 1. Fig. 1 schematically shows a lateral view of a workstation 2 of a device for winding on a thread 16 being continuously fed on a tube to form a cross-wound bobbin 5, in the present case a so-called automatic cross-winding machine 1. On the workstations 2 of automatic cross-winding machines 1 of this type, as known and therefore not described in more detail, the spinning cops 3 produced on ring spinning machines are rewound to form large-volume cross-wound bobbins 5. The cross-wound bobbins 5 are supplied to a following dyeing process, which completes the operation of producing the dye bobbins. 6 The cross-wound bobbins 5, after they have been produced, are transferred by means of an automatically operating service unit (not shown), preferably a cross-wound bobbin changer, to a cross-wound bobbin transporting mechanism 7 along the length of the machine and transported to a bobbin loading station or the like arranged at the end of the machine. Automatic cross-winding machines 1 of this type generally also have a logistics mechanism in the form of a bobbin and tube transporting system 6. The spinning cops 3 or empty tubes revolve on transporting plates 11 in this bobbin and tube transporting system 6. Of the tube transporting system 6, only the cop feed section 24, the storage section 25, which can be driven in a reciprocating manner, one of the transverse transporting sections 26 leading to the winding heads 2 and the tube return section 27 are shown in Fig. 1. As an alternative to the tube transporting system 6, round magazines can also be used, from which empty tubes can be removed. Each workstation 2 of the automatic cross-winding machine 1 has a workstation computer 28, which is connected via a bus connection 29 to a central control unit 30 of the automatic cross-winding machine 1, and various further mechanisms, which are necessary for proper operation of the workstations 2. One of these mechanisms known per se is the winding device 4, for example. A winding device 4 of this type has a creel 8, which is pivotably mounted about a pivot pin 12. As indicated in Fig. 1, the cross-wound bobbin 5 which is freely rotatably mounted in the creel 8 rests, during the winding operation, with its surface on a support and drive roller 9, which is driven by an electric motor 33. The electric motor 33 is connected, in this case, via a control line 32 to the workstation computer 28. To traverse the thread 16 during the winding process, a thread traversing mechanism 10 is provided. A thread traversing device 10 which is merely 7 schematically indicated in Fig. 1, consists, as shown in Fig. 2, for example, of a finger thread guide 13, which, driven by an electric motor drive 14, traverses the thread 16 running onto the cross-wound bobbin 5 between the end faces of the cross-wound bobbin 5. The thread guide drive 14 is in operative connection, in this case, via a control line 15 with the workstation computer 28. The cross-wound bobbins 5 produced at the workstations 2 of the automatic cross-wound bobbin machine 1 are subjected to the dyeing operation following the winding on process. For this purpose, the cross-wound bobbins 5 are placed on so-called dyeing mandrels. When placing a plurality of cross-wound bobbins 5 one after the other onto the dyeing mandrels, the tubes, onto which the thread 16 was wound to form cross-wound bobbins 5, are preferably formed so as to be compressible in the axial direction. The compressibility of the tube is used inter alia to increase the number of cross-wound bobbins 5 which can be supplied to a dyeing bath. The tubes are pressed against one another in such a way that the dyeing liquid does not flow around the cross-wound bobbins 5, but primarily through them. For this purpose, the end faces of the cross-wound bobbins 5 are pressed against one another in a sealing manner while the dyeing liquid is pressed outwardly proceeding from the dyeing mandrel through the interior of the tube. This leads to a more uniform penetration of the thread layers of the cross-wound bobbins 5 by the dyeing liquid. However, tubes which are rigid in the axial direction can also be used to produce the dye bobbins. To avoid damage to the inner thread layers due to the compression of the tubes occurring during the dyeing process, according to the invention, a cushioning winding wound on by the precision winding method is placed on the tube. In this case, thread layers are wound onto the tube while maintaining a constant winding ratio. For this purpose, the workstation computer 28 controls the drives 14,33 of the components of the workstation 2 decisively influencing the transfer of the thread 16 in such a way that the transfer of the thread 16 takes place in virtually parallel windings on the outer surface of the tube. The cushioning winding wound on in this 8 manner by the precision winding method, for its production, only requires a small thread length to form adequate protection for the thread layers to be wound on subsequently by the creation of a cushioning winding surrounding the outer surface of the tube completely. On reaching a predeterminable layer thickness of the cushioning winding to be wound on, a switch is automatically made by the workstation computer 28 to a winding method which can be predetermined to produce the cross-wound bobbin 5, preferably random winding. The thread transfer or the switch to the winding method is controlled by the workstation computer 28 of the respective winding head 2. It may be provided, in this case, that the thread layers to be wound onto the cushioning winding by a different winding method are wound on without prior severing of the thread layers at the transition from the cushioning winding to the cross-wound bobbin 5 to be wound. A seamless transition therefore takes place from the transfer of the thread 16 with precision winding for the cushioning winding to the transfer of the thread 16 with random winding to form the cross-wound bobbin 5 to be dyed. For this purpose, the workstation computer 28 initiates a switch of the winding method, without carrying out a severing at the transition of the thread layers. In other words, the thread 16 wound on as a cushioning winding is further used in a further processing of the dye bobbin after the dyeing operation following on from the production of the cross-wound bobbin 5. As an alternative, a severing of the thread layers at the transition can be initiated by the workstation computer 28 after the formation of the cushioning winding, before the switch takes place by means of the workstation computer 28 to a different winding method, in particular random winding. The thread end is now placed, with or without a thread reserve, on the cushioning winding. 9 Furthermore, to avoid the carrying out of a severing of the thread layers and the winding start thus becoming necessary after the formation of the cushioning winding, the thread 16 can be briefly transferred onto the tube beyond the winding width. In this manner, a back-off is produced next to the cushioning winding, which can be severed by the operating personnel before removal of the finished cross-wound bobbin 5, so the cushioning winding remains on the tube during removal of the thread 16. 10 WE CLAIM: 1. Method for producing a dye bobbin, in which a continuously supplied thread(16) is wound on a winding head of a textile machine having a plurality of winding heads (2) on a tube to form a cross-wound bobbin (5), which is then subjected to a dyeing process, wherein to protect the thread layers to be wound on, a cushioning winding is firstly applied to the tube, which covers the tube surface over the traversing region, and in that after the winding on of the cushioning winding, to wind on the thread (16) to form the cross-wound bobbin (5), a switch is made to a different winding method, characterised in that the cushioning winding is wound on at a constant winding ratio. 2. Method according to claim 1, characterised in that the cushioning winding is wound on at a high winding ratio, in particular a winding ratio of at least 5, and a low thread spacing. 3. Method according to either of claims 1 or 2, characterised in that, after the winding on of the cushioning winding, a switch is made to the winding method of random winding. 4. Method according to any one of claims 1 to 3, characterised in that at the transition of the thread layers from the cushioning winding to the cross-wound bobbin (5) to be wound, the thread (16) is severed. 5. Method according to claim 4, characterised in that the thread end is placed on the cushioning winding after the severing. 6. Method according to any one of claims 1 to 5, characterised in that the thread (16) is briefly wound on beyond the transfer width of the tube, so a thread back-off located next the cushioning winding is produced. 11 7. Method according to any one of claims 1 to 3, characterised in that the thread layers to be wound onto the cushioning winding are wound on without a severing at the transition of the thread layers. 8. Device for winding on a continuously supplied thread(16) on a tube to form a cross-wound bobbin (5) at a winding head (2) of a textile machine having a plurality of winding heads (2) to carry out the method according to any one of claims 1 to 7, wherein the winding heads (2) in each case have a single motor drive (33) which can be activated in a defined manner for a support and drive roller (9) and a single motor drive (14) which can be activated in a defined manner for a thread traversing mechanism (10), characterised in that the device has a control mechanism (28) which is set up to control the drives (14, 33), in such a way that firstly a cushioning winding is wound onto the tube at a constant winding ratio and in that after the winding on of the cushioning winding, a switch is made to a different winding method. Dated this 5th day of March, 2007 12 Abstract The present invention relates to a method for producing a dye bobbin, in which a continuously supplied thread (16) is wound on a winding head of a textile machine having a plurality of winding heads (2) on a tube to form a cross-wound bobbin (5), which is then subjected to a dyeing process, wherein to protect the thread layers to be wound on, a cushioning winding is firstly applied to the tube, which covers the tube surface over the traversing region, and in that after the winding on of the cushioning winding, to wind on the thread (16) to form the cross-wound bobbin (5), a switch is made to a different winding method, wherein the cushioning winding is wound on at a constant winding ratio. To The Controller of Patents The Patent Office Mumbai 13 (Kg-1)

Documents:

419-mum-2007-abstract(granted)-(2-8-2010).pdf

419-mum-2007-abstract.doc

419-mum-2007-abstract.pdf

419-MUM-2007-CANCELLED PAGES(29-12-2009).pdf

419-MUM-2007-CLAIMS(AMENDED)-(29-12-2009).pdf

419-mum-2007-claims(granted)-(2-8-2010).pdf

419-mum-2007-claims.doc

419-mum-2007-claims.pdf

419-mum-2007-correpondence(24-5-2007).pdf

419-mum-2007-correpondence(ipo)-(17-6-2009).pdf

419-mum-2007-correspondence(ipo)-(1-7-2010).pdf

419-mum-2007-correspondence(ipo)-(2-8-2010).pdf

419-mum-2007-correspondence-received.pdf

419-mum-2007-description (complete).pdf

419-mum-2007-description(granted)-(2-8-2010).pdf

419-mum-2007-drawing(granted)-(2-8-2010).pdf

419-mum-2007-drawings.pdf

419-mum-2007-form 1(29-12-2009).pdf

419-mum-2007-form 2(granted)-(2-8-2010).pdf

419-mum-2007-form 2(title page)-(complete)-(5-3-2007).pdf

419-mum-2007-form 2(title page)-(granted)-(2-8-2010).pdf

419-MUM-2007-FORM 3(29-12-2009).pdf

419-MUM-2007-FORM 5(29-12-2009).pdf

419-mum-2007-form-1.pdf

419-mum-2007-form-18.pdf

419-mum-2007-form-2.doc

419-mum-2007-form-2.pdf

419-mum-2007-form-26.pdf

419-mum-2007-form-3.pdf

419-mum-2007-form-5.pdf

419-MUM-2007-OTHER DOCUMENT(29-12-2009).pdf

419-MUM-2007-REPLY TO EXAMINATION REPORT(29-12-2009).pdf

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