Title of Invention

DEVICE FOR CORRECTING A DRAFT OF A TEXTILE FABRIC WEB

Abstract

A device (1) for correcting a distortion of a textile cloth web (4), in particular hanging edges. The device (1) has a rotatable correcting roller (3), around which the cloth web (4) is looped. To achieve a distortion correction, the correcting roller has a diameter varying over its length. Moreover, it is axially telescopic or axially adjustable. The correcting action can thereby be adapted correspondingly to the requirements.

Full Text

FORM 2 THE PATENT ACT 1970 (39 of 1970) & The Patents Rules, 2 003 PROVISIONAL / COMPLETE SPECIFICATION (See Section 10, and rule 13) l. TITLE OF INVENTION DEVICE FOR CORRECTING A DISTORTION OF A TEXTILE CLOTH WEB 2. APPLICANT(S) a) Name b) Nationality c) Address TEXMAG GMBH VERTRIEBSGESELLSCHAFT. SWISS Company ZEHNTENSTRASSE 17, 8800 THALWIL SWITZERLAND 3. PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner in which it is to be performed : - Device for correcting a distortion of a textile cloth web The invention relates to a device for correcting a ' 5 distortion of a textile cloth web, in particular hanging edges, according to the precharacterizing clause of Patent Claim 1. DE 24 04 582 Al discloses a straightening machine for 10 weft and stitch rows of textiles. This device consists of a series of rollers which are arranged one behind the other and are held so as to be vertically adjustable with respect to the web plane. The rollers in this case are set obliquely to the web running 15 direction or possess an arcuate run. When these rollers are adjusted with respect to the web in such a way that the latter is looped around them, this necessarily results in different running lengths for different regions of the weft threads. Oblique or arcuate 20 distortions of the weft threads within the cloth web can correspondingly be corrected in this way. However, an effective correction is possible only when the distortion extends approximately uniformly over the entire width of the cloth web. 25 Moreover, it is known from practice to press narrow rollers against the cloth web on both sides, the said rollers being driven at different rotational speeds. Owing to the speed differences associated with this, . 30 distortions within the cloth web can be compensated in virtually any desired way. In particular, with such a device, it is possible to correct even hanging edges. This solution, however, entails a considerable outlay in structural terms, thus having an adverse effect on 35 the costs of the device and for maintenance and upkeep. For this reason, a distortion correction of hanging edges is very often dispensed with, and a marginal region of greater or lesser width is cut away from the cloth web. 2 The object on which the invention is based is to provide a device and a method for correcting a distortion of a textile cloth web, which is also 5 suitable for distortions distributed non-uniformly over the cloth web, in particular hanging edges, arid which is distinguished by a low outlay in structural terms. 1 This object is achieved, according to the invention, by ' 10 means of the features of Patent Claim 1 and by means of the method steps of Patent Claim 20. The device according to Claim 1 serves for correcting a distortion of a textile cloth web, in particular a 15 local distortion, such as, for example, a hanging edge. In the weaving of a textile web, the weft threads are beaten back between the warp threads in order to achieve a marginal region of the cloth web which is not out of edge. This results in a material consolidation 20 in the edge region of the cloth web. This thickened edge region is removed during the make-up of the cloth. ; When the cloth web is wound up between the further process steps, this results, on account of the material thickening in the edge region, in a substantially 25 higher stress in the edge region than over the area of the cloth web. This higher stress in the edge region, in turn, gives rise to a difference in travel of the weft threads, so that these are bent back in the edge region. Consequently, after being unwound, the weft 30 threads possess a very pronounced twist in the marginal region, whereas in the remaining region they run quite uniformly. The region of these distorted weft threads extends in this case a few centimetres in into the cloth web where is no longer any material thickening. ' 35 These distortions are in this case locally limited, but relatively pronounced. To compensate these distortions, the cloth web is deflected by a correcting roller which has a diameter varying over the roller length. This varying diameter leads to a difference in travel over 3 ; the looped-round cloth web, as a result of which the distortion of the weft threads can be cancelled again. Particularly for the correction of hanging edges, the correcting roller is designed in such a way that it has 5 an approximately constant diameter over virtually the entire length and is reduced in diameter only in the marginal regions of the cloth web. It is conceivable, in this case, for only one end region of the correcting roller to be reduced in diameter, so that only one edge 10 region of the cloth web can be corrected with the aid of this correcting roller. In this application, preferably at least two correcting rollers are used, which are arranged essentially mirror-symmetrically with respect to one another. So that different 15 distortions can be corrected by means of these rollers, they are held axially displaceably. Consequently, the region of reduced diameter of the correcting roller can be moved to a greater or lesser depth into the edge region of the cloth web, in order to bring about a 20 higher or lower distortion correction. If the cloth web has no hanging edges at all, the roller is displaced in such a way that the region of reduced diameter of the correcting roller comes to lie outside the cloth web. Alternatively, the correcting roller may also correct 25 both edge regions. In this case, instead of an axial displacement of the entire correcting roller, the latter is telescoped. Both regions of varying diameter of the correcting roller can thereby be set, according the requirements, to those regions of the cloth web 30 which are to be corrected, without two rollers being required for this purpose. Moreover, the telescoping of the correcting roller has the advantage that, during the correction of pronounced distortions, its opposite end does not project so far beyond the cloth web. The 35 correcting device therefore requires only a little more space than the widest cloth web to be corrected. This is important, particularly under confined conditions, in the production of the cloth web. It would, in principle, be conceivable to design the 4 correcting roller in the form of two tubes engaging one into the other, in order to implement the desired telescopic capacity. This, however, would give rise, in the transitional region of the two tubes, to a step 5 leading to an undesirable pressure marking on the cloth web. It is more advantageous, therefore, if, according ' to Claim 2, the correcting roller is formed by a plurality of battens displaceable with respect to one another. These battens extend uniformly over the web 10 centre, so that they do not generate any pressure markings on the cloth web. Preferably, the longitudinal margin edges of the battens are rounded, so as also not to generate any transverse markings on the cloth web. 15 To adapt the correcting roller to different distortions, its is advantageous, according to Claim 3, if at least some of the battens are connected to at least one adjustment support. Preferably, every second batten is connected to an adjustment support, and the 20 remaining battens are connected to an opposite adjustment support. These adjustment supports generate axial adjustment movements, so that the two end regions of the correcting roller can be set independently of one another to the edge regions of the cloth web. It is 25 consequently possible to correct both edge regions of the cloth web by means of one roller. Particularly through the correcting of hanging edges, it is beneficial, according to Claim 4, if the 30 correcting roller has a narrowing design in at least one end region. Preferably, both end regions have a narrowing design, so that both edge regions can be corrected by means of one roller. 35 In the simplest instance, according to Claim 5, the end region of the correcting roller has a conically narrowing design. By the correcting roller increasingly being displaced axially in the direction of the centre of the cloth web, the difference in travel between the 5 cloth web edge and the middle region of the cloth web becomes increasingly greater, so that distortions of different magnitudes can be corrected in this way. 5 Alternatively, according to Claim 6, it is advantageous if, as seen in axial section, the correcting roller is designed, in the end region, to be curved with a gradient increasing towards the ends. Preferably, the gradient in the transitional region to the cylindrical 10 region of the correcting roller amounts to 0, so that the end region merges tangentially into the cylindrical region of the correcting roller. This results in a very good adaptation of the correcting device to actual distortions in the form of hanging edges. These 15 distortions are, as a rule, such that they increase relatively sharply towards the cloth web edge. A parabolic forming of the end region of the correcting roller, according to Claim 7, has proved particularly 20 appropriate. This specially selected form possesses the advantage that, even in the event of the axial displacement of the end region, there is always a very good adaptation of the change in travel caused by the correcting roller to the respective form of distortion 25 of hanging edges. To achieve an improved adaptability of the distortion correction to distortions of different magnitude, it is beneficial, according to Claim 8, if the correcting 30 roller has, in at least one end region, adjustable correcting battens. These correcting battens in this case form the outer contour of the correcting roller, so that the amount by which the outside diameter of the correcting roller changes can be set with the aid of 35 the correcting batten. The correcting roller can consequently be set, according to the conditions, to the width and magnitude of the distortion, in each case independently. 6 In a preferred development according to Claim 9, the correcting battens are connected in one piece to the battens. The correcting battens in this case form only the end pieces of the batten. The batten portions 5 forming the cylindrical portion of the correcting roller are in this case of fixed design, whereas the end regions are bendable in order to adapt the diameter of the correcting roller. 10 To achieve a beneficial adaptability of the correcting battens, according to Claim 10 these are adjustable. This applies both to a radial bending and to a pivoting of the correcting battens about corresponding rotary joints. 15 In order to keep the actuating forces required for adjusting the correcting battens low, it is beneficial, according to Claim 11, to hold these on the inside of the cloth web via rotary joints. 20 Alternatively, according to Claim 12, it is advantageous if the correcting battens can be bent via control means. These control means preferably consist of a corresponding lever mechanism which engages on the 25 free end of the correcting battens. The opposite ends of the correcting battens are in this case clamped fixedly, if appropriate connected in one piece to the battens. This results in a tangential transition between the cylindrical region and the correcting 30 region of the correcting roller. Alternatively, according to Claim 13, it is beneficial if the correcting roller has a body of revolution in at least one end region. This body of revolution possesses 35 a fixed outer contour which narrows towards the free end and which is therefore permanently set. The outlay in structural terms which the correcting roller involves is thereby reduced considerably. To adapt the correcting roller to different cloth webs, the body of 7 revolution is preferably held exchangeably, so that different outer contours can be implemented. So that the battens or correcting battens do not 5 introduce any additional distortions into the cloth webduring their axial movement, it is advantageous, according to Claim 14, if these are designed at least partially, but preferably completely, so as to be slidable on their outside. This prevents the battens or 10 correcting battens from taking up the cloth web during their axial adjustment movement. Alternatively, according to Claim 15, the battens or correcting battens may also be designed to be adhesive 15 on their outside, in order to exert a pulling action on the cloth web. In this case, the adhesive coatings are preferably located in the end regions of the battens or in the region of the correcting battens. 20 For the automatic adaptation of the correcting roller to different distortions, its is advantageous, according to Claim 16, if the correcting roller is operatively connected to a controller. This controller is influenced by a measuring device which detects the 25 distortion of the cloth web. The controller in this case influences the axial position or length of the correcting roller, in order to compensate the measured distortion. Alternatively or additionally, the controller may also influence the position of the 30 correcting batten, if these are present. Optimum distortion correction during running operation is thereby possible. Particularly when the correcting roller is designed as 35 a batten roller, it is advantageous, according to Claim 17, if this is designed at the same time as a guiding or spreading roller. As a result, the battens of the correcting roller perform a double or triple function, this leading, overall, to a highly space- 8 saving construction. In order to decouple the different actions of the correcting roller, it is advantageous, according to 5 Claim 18, if the battens can be adjusted axially during a roller revolution. The adjustment movement of the battens within a roller revolution takes place in this case by control means which are influenced by a web-run controller. By contrast, the middle position of the 10 battens determines the distortion-correction action, on which preferably a separate controller acts. According to Claim 19, it is beneficial if the correcting roller precedes a weft-thread straightener. 15 In this case, the correction roller can correct very slightly hanging edges, so that the following weft-thread straightener can bring about an effective correction of the distortion present over the entire width of the cloth web. In this application, the 20 correcting roller serves solely for the correction of hanging edges. Particularly for the correcting of hanging edges of textile cloth webs, the method according to Claim 2 0 25 has proved appropriate. In this case, the cloth web loops around a correcting roller which has a diameter differing over the roller length. The roller length or roller position is in this case set or regulated axially in order to compensate a distortion. The 30 adjustment of the adjusting roller in this case takes place as a function of the measured distortion, with the result that an optimum correction result can be achieved. 35 A preferred development of the method may be gathered from Claim 21. Here, the axial position of a region of changing diameter of the correcting roller is set or regulated as a function of the measured distortion, thus leading to a sensitive distortion correction. 9 The subject of the invention and the method according to the invention are explained by way of example with reference to the drawing, without the scope of 5 protection being restricted. In the drawing: Figure 1 shows a longitudinal sectional illustration 10 through a device for correcting a distortion, Figure 2 shows a detail of a first alternative embodiment of the device according to Figure 1, 15 Figure 3 shows a detail of a second alternative embodiment of the device according to Figure 1, and 20 Figure 4 shows an associated sectiona illustration, along the sectional line IV - IV according to Figure 1, of a general view of the device for correcting a distortion, with a weft-thread straightener. 25 A device 1 according to Figure 1 consists of a frame 2, in which a correcting roller 3 is mounted rotatably. The correcting roller 3 may in this case be freely rotatable, as illustrated. Alternatively, it is also 30 conceivable for the correcting roller 3 to be motor-driven, in order to compensate frictional forces of the cloth web 4 when the latter loops around the correcting roller 3. 35 The correcting roller 3 possesses a middle cylindrical portion 5 which two end regions 6 adjoin at both ends. In the cylindrical portion 5, the correcting roller 3 is formed by a number of battens 7 which are distributed over its circumference and which can be 10 adjusted axially with respect to one another. Every second batten 7 is in this case held on a left-hand , t adjustment support 8, and the remaining battens 7 are held on a right-hand adjustment support 8. The 5 correcting roller 3 is thereby telescopic, without resulting, in the middle portion 5, in a diameter step which could lead to pressure markings on the cloth web 4. The correcting roller 3 can be brought virtually to double its size by means of this batten mechanism. 10 At each of the two end regions, the correcting roller 3 has a body of revolution 9 which is designed to narrow toward the free end 10. The body of revolution 9 in this case possesses an outer contour in the form of a 15 part-paraboloid with a tangential transition to the middle portion 5 of the correcting roller 3. The correcting roller 3 is, on the one hand, preceded and, on the other hand, followed by a guide roller 11 20 in each case. These guide rollers 11 serve merely for deflecting the cloth web 4 in order to generate the required looping angle around the correcting roller 3. Moreover, the correcting roller 3 is followed by a 25 measuring device 12 which is provided in each edge region 13 of the cloth web 4. The measuring device 12 detects the image of the cloth web 4 in the edge region 13 with the aid of a CCD camera 14. The CCD camera 14 is assigned corresponding lighting devices which are 30 omitted in Figure 1 for the sake of simplicity. The CCD camera 14 is operatively connected to an image processing device 15 which, from the image data detected by the CCD camera 14, determines the distortion values of the weft threads and transmits 35 them in the form of a running measurement value to a controller 16. The controller 16 acts on the in each case assigned adjustment support 8 of the correcting roller 3, in order to displace the body of revolution 9 correspondingly axially. 11 When the measuring device 12 following the correcting roller detects a distortion of the cloth web 4, the controller 16 actuates the adjustment support 8 to the 5 left or to the right, in order to increase or reduce the difference in travel between the web edge and the web centre. The distortion-correction action is thereby adapted correspondingly to the requirements of the distortion, so that the edge regions 13 of the cloth 10 web 4 have essentially straight weft threads. Figure 2 shows an alternative embodiment of the device 1 according to Figure 1, the same reference symbols designating identical parts. The battens 7 are held on 15 a sliding carriage 17 which is connected to the adjustment support 8, not illustrated. The sliding carriage 17 has a series of jointed connections 18, at which correcting battens 19 are articulated. These correcting battens 19 may be designed to be straight 20 or, according to the illustration in Figure 2, curved. The correcting battens 19 can be set at different angles via a lever mechanism 20 engaging into a slotted link 21, in order to adapt the correcting action of the correcting roller 3 correspondingly. This adaptation 25 takes place as a back-up to the axial displacement of the adjustment support 8. Figure 3 shows a further alternative embodiment of the device according to Figure 1, the same reference 30 symbols again designating identical parts. In this embodiment, the correcting battens 19 are connected in one piece to the battens 7, so that the correcting battens 19 form bending bars clamped on one side, to be precise in the sliding carriage 17. In this case, the 35 lever mechanism 20 does not ensure simple pivoting of the correcting battens 19, but a bending of these, the correcting battens 19 merging tangentially into the batten 7 in any desired position of the lever mechanism 20. 12 Finally, Figure 4 shows a sectional illustration of the device 1 according to Figure 1 along the sectional line IV-IV. In the illustration according to Figure 4, not 5 only is the device 1 shown, but also the assignment of the latter to a weft-thread straightener 22. The weft-thread straightener 22 serves for correcting the distortion of the weft threads of the cloth web 4, and can correct essentially only distortions which are 10 distributed essentially uniformly over the cloth web 4. The device 1 with the correcting roller 3 serves in this case for the distortion correction of hanging edges. The device 1 in this case ensures that the distortions introduced into the cloth web 4 are 15 distributed as uniformly as possible over the entire width of the cloth web 4 and can consequently easily be levelled out by the weft-thread straightener 22. 13 5 10 List of reference symbols 1 device 2 frame 3 correcting roller 4 cloth web 5 middle portion 6 end region 7 batten 8 adjustment support 9 body of revolution 10 free end 11 guide roller 12 measuring device 13 edge region 14 C C D camera 15 image processing device 16 controller 17 sliding carriage 18 jointed connection 19 correcting batten 20 lever mechanism 21 slotted link 22 weft-thread straightener We Claim : 1. Device for correcting a distortion of a textile , cloth web (4), the device (1) having at least one 5 rotatable correcting roller (3) around which the cloth web (4) is looped, characterized in that the correcting roller (3) has a diameter varying over its length and is axially telescopic and/or axially adjustable. 10 2. Device according to Claim 1, characterized in that the correcting roller (3) has plurality of battens (7) which are distributed over its circumference and which are displaceable with respect to one another. 15 3. Device according to Claim 2, characterized in that at least some of the battens (7) are connected to at least one adjustment support (8) which can generate an axial adjustment movement. 2 0 4. Device according to at least one of Claims 1 to 3, characterized in that the correcting roller (3) has a narrowing design in at least one end region (6). 5. Device according to Claim 4, characterized in 25 that the correcting roller (3) has a conically narrowing design in at least one end region (6). 6. Device according to Claim 4, characterized in that, as seen in axial section, the correcting roller 30 (3) is designed, in at least one end region (6), to be curved with a gradient increasing towards the free ends (10) . 7. Device according to Claim 6, characterized in 35 that, as seen in axial section, the correcting roller (3) is curved approximately parabolically in at least one end region (6). 8. Device according to at least one of Claims 4 to 15 7, characterized in that the correcting roller (3) has, in at least one end region (6), adjustable correcting battens (19) forming the outer contour of the said correcting roller. 5 9. Device according to Claim 8, characterized in that the correcting battens (19) are connected in one piece to the battens (7). 10 10. Device according to Claim 8 or 9, characterized in that the correcting battens (19) are radially adjustable. 11. Device according to Claim 10, characterized in 15 that the correcting battens (19) are held via rotary joints. 12. Device according to Claim 11, characterized in that the correcting battens (19) can be bent by control 20 means (20) which engage in the region of the free ends (10) of the correcting battens (19), the opposite ends of the latter being clamped. 13. Device according to at least one of Claims 1 to 25 7, characterized in that at the correcting roller (3) has a body of revolution (9) in at least one end region (6) . 14. Device according to at least one of Claims 2 to 30 13, characterized in that the battens (7) or correcting battens (19) are designed to be at least partially slideable on their cloth-web outside facing the cloth web (4). 35 15. Device according to at least one of Claims 2 to 14, characterized in that the battens (7) and/or correcting battens (19) are designed to be partially adhesive on their outside facing the cloth web (4). 16 16. Device according to at least one of Claims 1 to 15, characterized in that the correcting roller (3) is operatively connected to a controller which varies its axial position and/or length and which is influenced by 5 a measuring device (12) detecting the distortion of the cloth web (4). 17. Device according to at least one of Claims 2 to 16, characterized in that the correcting roller (3) is 10 designed as a guiding and/or spreading roller. 18. Device according to Claim 17, characterized in that the battens can be adjusted axially during the roller revolution by control means, the control means 15 being influenced by a web-run controller. 19. Device according to at least one of Claims 1 to 18, characterized in that the correcting roller (3) precedes a weft-thread straightener (22) in order to 20 correct hanging edges of the cloth web (4). 20. Method for correcting a distortion of a textile cloth web (4) which loops around at least one correcting roller (3), in particular according to at 25 least one of claims 1 to 19, the roller length and/or roller position of which is set or regulated axially as a function of the distortion. 21. Method according to Claim 20, in which the 30 axial position of a region of changing diameter of the correcting roller (3) is set or regulated as a function of the measured distortion. 17 Abstract A device (1) for correcting a distortion of a textile cloth web (4), in particular hanging edges. The device (1) has a rotatable correcting roller (3), around which the cloth web (4) is looped. To achieve a distortion correction, the correcting roller has a diameter varying over its length. Moreover, it is axially telescopic or axially adjustable. The correcting action can thereby be adapted correspondingly to the requirements. (Figure 1) 18

Documents:

1102-MUM-2005-ABSTRACT(6-8-2009).pdf

1102-mum-2005-abstract(granted)-(17-9-2010).pdf

1102-mum-2005-abstract.doc

1102-mum-2005-abstract.pdf

1102-MUM-2005-CANCELLED PAGES(6-8-2009).pdf

1102-mum-2005-cancelled pages-(9-7-2010).pdf

1102-MUM-2005-CLAIMS(6-8-2009).pdf

1102-mum-2005-claims(amanded)-(6-8-2009).pdf

1102-MUM-2005-CLAIMS(AMENDED)-(9-7-2010).pdf

1102-mum-2005-claims(granted)-(17-9-2010).pdf

1102-mum-2005-claims.doc

1102-mum-2005-claims.pdf

1102-mum-2005-correspondance-received-ver-130905.pdf

1102-mum-2005-correspondance-received-ver-290107.pdf

1102-mum-2005-correspondence(13-12-2005).pdf

1102-MUM-2005-CORRESPONDENCE(9-7-2010).pdf

1102-mum-2005-correspondence(ipo)-(17-11-2008).pdf

1102-mum-2005-correspondence(ipo)-(17-9-2010).pdf

1102-mum-2005-description (complete).pdf

1102-MUM-2005-DESCRIPTION(COMPLETE)-(6-8-2009).pdf

1102-mum-2005-description(granted)-(17-9-2010).pdf

1102-MUM-2005-DRAWING(6-8-2009).pdf

1102-mum-2005-drawing(granted)-(17-9-2010).pdf

1102-mum-2005-drawings.pdf

1102-MUM-2005-ENGLISH TRANSLATION(9-7-2010).pdf

1102-MUM-2005-FORM 1(6-8-2009).pdf

1102-mum-2005-form 2(6-8-2009).pdf

1102-mum-2005-form 2(granted)-(17-9-2010).pdf

1102-MUM-2005-FORM 2(TITLE PAGE)-(6-8-2009).pdf

1102-mum-2005-form 2(title page)-(granted)-(17-9-2010).pdf

1102-MUM-2005-FORM 3(6-8-2009).pdf

1102-mum-2005-form-1.pdf

1102-mum-2005-form-18.pdf

1102-mum-2005-form-2.doc

1102-mum-2005-form-2.pdf

1102-mum-2005-form-3.pdf

1102-mum-2005-form-5.pdf

1102-mum-2005-general power of attorney(13-12-2005).pdf

1102-MUM-2005-REPLY TO EXAMNIATION REPORT(6-8-2009).pdf

1102-MUM-2005-SPECIFICATION(AMENDED)-(9-7-2010).pdf

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