FR2869923A1 - Finishing process for a loom-woven fabric uses information system to control cropping of loose yarns on reverse side of fabric - Google Patents

Abstract

The process, designed to be carried out directly on a loom (2) producing a fabric (1) with a woven pattern on its front side and loose yarns on the reverse side, uses an information system (22) linked to a finisher (21) on the loom. The finisher contains a laser cropper (210), and a holder (211) for the cropped yarns, and during the weaving process the loose yarns are cropped on the loom after a fabric pick has been formed, and the cropped yarns are retained by the holder.

Description

Process for finishing of fabric on a loom and

  The present invention relates to a method of fabric finishing performed on a loom and the associated loom.

  It is known in the prior art processes for finishing fabrics after manufacture on looms by rework operations. These methods make it possible to shave off excess yarn or floats on the back of the fabric and then glue the aftershave threads to the fabric support so that they do not pull away from the fabric. Some methods provide for mechanically shaving the floats of the fabric directly onto the loom. Other methods provide for laser shaving the floats of the fabric out of the loom, that is to say on a fabric fallen off the loom. The laser shaving out of the loom requires to stretch the fabric again on a support and does not allow to obtain quickly a perfect result.

  The finishing processes known from the prior art propose a gluing of the face of the fabric prior to shaving the floats, a step of bonding the reverse side of the fabric after shaving the floats and a removal of the glue on the side face. fabric. These methods of removing the glue on the face of the fabric can damage the fabric and leave traces of glue, during these rework operations.

  The purpose of the present invention is to overcome certain disadvantages of the prior art by proposing a process for finishing the fabric avoiding rework operations, the method providing a laser shaving of the floats.

  This object is achieved by a fabric finishing process carried out directly on a loom, the fabric comprising on its face flanks and on its face the woven pattern, the method is characterized in that it is made by a computer system, on the one hand, connected to a finishing device mounted on a loom, comprising a shaving element, a holding element of the shaved threads and, on the other hand, connected to the loom comprising elements in that the method comprises the following steps: a first step of shaving the floats of the fabric by the shaving element is carried out directly on a seam line of the fabric after formation of a pick of the fabric by the loom weaving, a second step of maintaining the shaved face of the back of the fabric, made by the holding element shaved son to maintain the shaved son on the reverse side of the fabric.

  According to another particular feature, the method of ennobling fabric lo comprises a third step of setting up a back-back, carried out by an element for setting up a back-back incorporated in the finishing device and which allows to finalize the rendering of the fabric.

  According to another feature, the third step of laying a back-back takes place after the second step of maintaining the shaved son.

  According to another feature, the third step of placing a contredos takes place before the second step when using a pre-coated fabric back-back, the second step making it possible to maintain this counter-step. back on the son shaved by redesign of the pre-coated fabric glue made by the holding element of the shaved son.

  In another feature, the method of fabric finishing includes a step of controlling, by the computer system, the advancement of the fabric on the loom for positioning the previously woven fabric in front of the fabric. shaving element.

  According to another feature, the step of controlling, by the computer system, the advancement of the fabric on the loom makes it possible to position the previously treated fabric vis-à-vis the setting element of a back-back and the holding element of the shaved threads.

  In another feature, the finishing process has a correlated operation with the operation of weaving elements of the loom.

  According to another feature, the first step is controlled by the computer system after a step of detecting the end of forming a pick on the line of the fabric.

  A second object of the invention is to provide a loom using the method of fabric finishing.

  This object relates to a loom comprising a weaving device on the back of a fabric and a device for ennobling the back of the fabric, the finishing device being arranged in parallel with the weaving device above the weaving machine. woven fabric between a seam line and a chest of the trade, the ennobling device comprising a shaving element for continuous shaving floats appeared at each addition of a fabric pick on the seam line, an element of keeping the shaved threads to maintain the shaved side of the fabric.

  According to another feature, the shaving element of the finishing device 15 is a mechanical means.

  According to another feature, the shaving element of the ennobling device is a laser means.

  According to another feature, the laser means of the shaving element is disposed on the side of the fabric facing the seam line so that the laser beam of the laser means is located transversely to the ropes of the loom.

  In another feature, the laser means of the shaving element is disposed above and after the seam so that the laser beam of the laser means sweeps across the width of the tissue.

  According to another feature, the maintaining element of the finishing device comprises a protruding element of length equal to the width of the fabric and disposed opposite the shaved fabric in order to directly maintain the entire width of the fabric. tissue.

  According to another particular feature, the maintaining element of the finishing device comprises a small projecting element, removable parallel to the width of the fabric and arranged opposite the shaved fabric in order to carry out a scanning hold on the width of the fabric.

  According to another feature, the holding element is a coating means for fixing on the reverse side of the fabric shaved son with the aid of an adhesive.

  According to another particularity, the glue is of PVC type and makes it possible to make a back-back.

  In another feature, the loom includes a backing member on the back side of the fabric.

  According to another feature, the implementation element of a back-back, posing a back-type gauze or foam, is disposed after the holding member.

  According to another particularity, the element for setting up a back-back, placing a pre-coated fabric back-back, is arranged before the holding element, the holding element for melting the glue. pre-coated fabric on shaved threads.

  In another feature, the loom comprises a computer system connected to the weaving device and the finishing device, the computer system operating according to the finishing method.

  According to another particularity, the weaving device comprises a front beam comprising a ply of ropes, wound on a reeling roll by a mechanism for driving the ply of ropes to supply it to the loom as it weaves the loom. fabric, lices periodically opening the web of ropes thus defining a crowd in which weft son are successively inserted using a transverse insertion means insertion, a comb clamping against the fabric frames formed through a comb striking movement forming a seam line, a rear beam for winding the woven fabric by a drive mechanism.

  Other features and advantages of the present invention will emerge more clearly on reading the following description, made with reference to the appended drawings, in which: FIG. 1 represents a schematic illustration of a weaving machine, according to an embodiment of the present invention; Fig. 2 is a schematic illustration of a cloth stitch employed for weaving a fabric according to an embodiment of the present invention; FIG. 3 is a logic diagram of the method for finishing a fabric on the loom shown in FIG. 1, according to one embodiment of the present invention.

  Fig. 2 is a schematic illustration of a cloth stitch employed for weaving a fabric (1) on a loom. Other weaving points may be employed by the loom of the present invention. The stitch is an intertwining of ropes (10a, 10n), which form the base of the fabric (1), and wefts (11a, 11n) passing perpendicularly above or below the ropes (10a, 10n). Each return of frames (11 a, 11 n) through the ropes (10a, 10n) forms a pick, that is to say that all the strings (10a, 10n) of the same line on the fabric are covered by a frame (11 a, 11 n). In the face (12), the ropes (10a, 10n) of the fabric are covered by the wefts (11a, 11n) and in the reverse side (13) the wefts (11a, 11n) are not caught in the ropes (10a). , 10n) form floats (14). On a traditional loom there is very quickly on the reverse side (13) of the fabric a pile of floats (14) superimposed on each other. This pile of floats (14) may comprise a higher density of yarns than the actual density of the pile present on the face (12). The density of the backside (13) can be up to 15 or even 24 times the actual density of the pick seen on the face (12) depending on the number of frame colors (11a, 11n) used on the same pick. After a passage of 32 half-switches, for example, in 24 frame colors, the fabric comprises 768 frames whose traditional loom must manage at each end to immobilize them and to allow the color selector of the loom to present normally a new frame. In addition, it is also possible that 2 or 3 frames are used on the same pick instead of 24 frames, so there may be significant variations in the thickness of the floats and therefore an imbalance between the center of the fabric and the fabric edges that advance more rapidly during weaving. In order to counter these problems of accumulation of floats during the weaving of the fabric, the invention proposes to carry out directly the finishing of the fabric after formation of each pick of the fabric. That is, to shave the floats directly on the loom after forming the pick.

  FIG. 1 is a diagrammatic illustration of a Jacquard mechanical loom (2) operating according to the finishing method of the present invention which will be explained in the following description. The loom (2) comprises a weaving device (20) comprising elements for weaving the fabric (1), a finishing device (21) for rendering the fabric (1) its final quality and a computer system (22) connected to the weaving elements (20) and the finishing device (21). The known traditional part of the loom (2) contains the elements making the weaving (20). These elements comprise a front beam (21) comprising a sheet of warp or rope yarns (10), wound on a roll which unwinds this sheet of yarn (10) to provide it to the craft as it weaves the fabric (1). The rotational movement of the front beam (201) is achieved by a drive mechanism (202), such as a motor (202) controlled by the computer system (22). The web of the warp yarns (10) is periodically opened by strips (203a, 203n) which thus define a shed (204) in which weft yarns or picks are successively inserted by means of a shuttle, a vehicle or spear with transverse movement. The warp threads (10) are each mounted and lowered by the links (203a, 203n) connected to the computer system (22). The control, by the computer system (22), of the rise and descent of the lices (203a, 203n) allows the passage of the frames above or below the ropes (10) thereby achieving the point of canvas shown in Figure 2 After each formation of a pick, it is clamped against the previously woven fabric (1) by a striking movement of the leaf or comb (205) forming a seam (206). The woven fabric (1) is then wound by the rotational movement of a rear beam (208) and stored on the same beam (208). Rotation of the rear beam (208) is performed by a drive mechanism (209), such as a motor (209). The loom weaves the fabric (1) on the backside of the fabric (1), the backside of the fabric (1) comprising the floats (14) being visibly presented to the master kneader. The finishing device (21) is arranged on the loom facing the backside (13) of the fabric (1) above the line of cut (206) of the fabric. The finishing device (21) comprises a shaving element (210) and a holding element (211) of the shaved wires. These elements are arranged between the seam line (206) and the chest (207) of the loom. A backing member (212) may be added, if necessary, in the finishing device (2). The shaving element (210) shaves the floats (14) of the fabric (1) after forming a pick and settling thereof by the comb (205). In a preferred embodiment of the invention shaving floats is performed by laser. Other shaving embodiments, such as mechanical shaving, may be used. The rest of the description will be based on a laser shaving element. According to one embodiment, the shaving member (210) is disposed opposite the woven fabric after the seam (206) so that the laser beam sweeps across the width of the fabric to shave the floats. .

  According to another embodiment, the laser element (210) can be arranged on the side of the fabric so that the laser beam is located transversely to the ropes of the line of formation to effect a direct shaving of the floats. Other embodiments of the laser element may be envisaged. After the shaving element, a float suction device may be placed above the woven fabric having just been shaved, in order to suck the shaved floats. The shaved wire holding member (211) is disposed after the shaving member (210) and allows after shaving of the floats (14) to keep the shaved threads arranged on the woven fabric (1), preventing these do not withdraw from the fabric (1). The maintenance of the fabric can be achieved by the direct deposition of a glue on the woven fabric, or after the laying of a pre-coated fabric backing, by the remaking of the glue of the fabric made by the element of maintaining, for example a heating element. According to one embodiment, the shaved wire holding member may comprise a projecting element (211a) of dimension equal to the width of the fabric and arranged opposite the shaved fabric to fix directly over the entire width of the fabric. fabric the shaved threads. According to another embodiment, the shaved wire holding member (211) may comprise a small projecting element (211a) arranged opposite the shaved fabric sweeping the width of the shaved fabric. to apply glue for example. In these two previous embodiments, the shaved wire holding member (211) may also comprise a support element (211b) placed under the face of the fabric and facing the protruding element. (211a). This support element (211b) makes it possible to maintain the fabric during the passage of the projecting element (211a) depositing a coating. The support member may be replaced by a regulating mechanism (207 ') of the tension of the woven fabric placed after the chest (207) to tension the fabric during the coating. Other embodiments of the shaved wire holding member (211) can be envisaged. The backing member (212) may be disposed before or after the holding member (211) and allows a counter back to be placed on the backside of the fabric (1) to provide a quality final fabric and to strengthen the maintenance of shaved threads. The backing inserting member may comprise a roller (212a) having the backing film or pre-coated fabric, a protruding member (212b) disposed across the width of the backside fabric (13) and a support member (212c) of the fabric on the location face 2869923 (12). When placing the back-back, the roller (212a) unrolls the back-back, the projecting element (212b) makes it possible to place the back-back on the back of the fabric, the back-back being pressed. between the projecting element (212b) and the support element (212c). The backing may be a film such as a gauze, a plastic foam, a pre-coated fabric or a thick PVC type glue. In the case of PVC-type thick glue back-back, the back-up setting element is not incorporated in the finishing device, the shaved wire holding element ( 211) performing the installation of the glue. The fabric thus ennobled is then wound by the rear beam (208) of the loom (2). A computerized weaving model is stored in a memory of the computer system (22). From the reading of this model, the computer system (22) controls the weaving elements of the loom (2), such as the rise and fall of the lices (203a, 203n), the advancement of the lance between the warp yarns (10), the bursts of the comb (206) to form the seam (205) and the advancement of the fabric on the loom by the action of the drive mechanisms (202, 209) of the front beam and roller (208). The computer system (22) also controls the finishing device (21) according to a finishing method presented hereinafter, the operation of the finishing process being correlated with the operation of the weaving device (20).

  The finishing process consists in firstly shaving the floats (14) by the shaving element (210) and then keeping the wires shaved by the holding element (211) and finally, if necessary, placing a contredos on the shaved and maintained threads. FIG. 3 represents a logic diagram, according to a first embodiment, of the finishing method (21) executed by the computer system (22) connected to the finishing device (21) of the loom (2). A first step (220) is to detect the end of formation of a pick on the line of formation (206) of the fabric (1) and the end of packing of the frames of this line by the comb (205). This detection can be determined by the conventional operation of the weaving device (20) on the loom (1), also managed by the computer system (22) to know the number of jolts given by the comb (205). ) on the frames. A second step (221) enables the computer system to control the rear beam (208) to actuate the advancement of the woven fabric, to position the unshaded floats under the shaving element (210), the shaved floats under the shaved wire holding member (211) and the frames held under the backing member (212). the computer system controls, in a third step (222), shaving by actuating the shaving element (210) of the finishing device (21) so that, for example, the laser beam of the shaving element shaves the floats (14) formed by the frames (11). After shaving the floats (14) a fourth step (223) allows to control the holding element (211) of the shaved son, the projecting element (211a) touching the backside (13) of the fabric (1) coming from to be shaved, the face of the fabric being supported on the support element (212b). The shaved son on the back side (13) of the fabric (1) can be fixed for example by means of an adhesive, thus allowing the woven son located on the face of the fabric do not withdraw. A fifth step (224) allows to actuate the implementation element of a back-back. This element makes it possible to position on the reverse side of the previously coated fabric, a protective backing to finalize the manufacture of the fabric and makes it possible to maintain the back-back on the back (13) of the fabric (1) by pressure between the protruding element (212b) and the support element (212c). After placing and maintaining the back-back, the fabric is wound on the rear beam (208) of the loom (2).

  According to an alternative embodiment of the finishing process, the fifth step (224) of setting up a back-back does not take place in the case where the back-back is a PVC type glue previously laid by the holding member (211) in the fourth step (223).

  According to an alternative embodiment of the finishing process, when using a pre-coated fabric backing, the fifth step (224) of setting up a back-back, takes place before the fourth step (223) of maintaining the shaved threads. The holding element (211) reshapes the glue of the pre-coated against back to maintain the contredos on the shaved threads of the fabric.

  It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed. Therefore, the present embodiments should be considered by way of illustration, but may be modified within the scope defined by the scope of the appended claims, and the invention should not be limited to the details given above.

Claims (22)

  1. Method of fabric finishing performed directly on a loom (2), the fabric (1) comprising on its underside (13) floats (14) and on its face (12) the woven pattern, the method is characterized in that it is performed by a computer system (22), firstly connected to a finishing device (21) mounted on a loom, comprising a shaving element (210), an element holding the shaved threads (211) and secondly, connected to the loom (2) comprising weaving elements (20) and in that the method comprises the following steps: a first step (222) of shaving floats (14) of the fabric (1) by the shaving element (210) is carried out directly on a line of cut (206) of the fabric (1) after formation of a pick of the fabric (1) by the loom (2), a second step (223) for maintaining the upside-down face (13) of the shaved fabric (1) produced by the holding element (211) of the wires r ases to maintain the shaved son on the reverse side (13) of the fabric (1).   2. A method of finishing fabric according to claim 1, characterized in that it comprises a third step (224) of establishment of a back-back made by a setting element of a back-back (212) incorporated in the ennobling device (21) and which finalizes the rendering of the fabric (1).   3. A method of finishing fabric according to claim 2, characterized in that the third step (224) of laying a back-back takes place after the second step (223) for holding the shaved son.   4. A method of fabric finishing according to claim 2, characterized in that the third step (224) of setting up a back-back takes place before the second step (223) when using a against the back in pre-coated fabric, the second step (223) for maintaining the back against the shaved son by redesign of the pre-coated fabric glue made by the holding member.   5. Process for finishing fabric according to claim 1, characterized in that it comprises a step (221) of control by the computer system of the advancement of the fabric on the loom for positioning the previously woven fabric opposite the shaving element (210).   6. Process for finishing fabric according to one of claims 2 to 5, characterized in that the step (221) of control by the computer system of the advancement of the fabric on the loom allows to position the previously treated tissue vis-à-vis the element of establishment of a back-back (212) and the holding member (221).   7. The finishing method according to one of claims 1, 5 and 6 or 2 to 6, characterized in that it has a correlated operation with the operation of the weaving elements (20) of the loom.   8. Finishing process according to one of claims 1, 5, 6 and 7 or 2 to 7, characterized in that the step of controlling the advance of the fabric (221) is controlled by the computer system after a step of detecting (220) the end of forming a pick on the seam (206) of the fabric (1).   9. Loom characterized in that it comprises a weaving device (20) on the back of a fabric (1) and a finishing device (21) of the back of the fabric (1), the finishing device (21) being arranged in parallel with the weaving device (20) above the woven fabric between a seam line (206) and a chest of the loom, the finishing device (21) comprising a weaving element shaving device (210) for continuous shaving of floats (14) which appear at each addition of a fabric pick (1) on the forming line (206), a shaved thread holding element (211) for maintaining the face down (13) shaved off the fabric (1).   10. Loom according to claim 9, characterized in that the shaving element (210) of the ennobling device (21) is a mechanical means.   11. Loom according to claim 9, characterized in that the shaving element (210) of the finishing device (21) is a laser means.   A loom according to claim 11, characterized in that the laser means (210) of the shaving element is arranged on the side of the fabric facing the seam (206) so that the laser beam of the laser means (210) is located transversely to the ropes of the loom.   13. Loom according to claim 11, characterized in that the laser means (210) of the shaving element is disposed above the fabric and after the seam (206) so that the laser beam of the laser means (210) sweeps across the width of the fabric (1).   14. Loom according to one of claims 9 to 13, characterized in that the shaved wire holding member (211) of the finishing device (21) comprises a projecting element (211a) of length equal to the width fabric (1) and disposed vis-à-vis the shaved face of the fabric to achieve direct maintenance over the entire width of the fabric (1).   15. Loom according to one of claims 9 to 14, characterized in that the shaved thread holding member (211) of the finishing device (21) comprises a projecting element (211a) of small size, removable from parallel to the width of the fabric and disposed vis-à-vis the shaved face of the fabric in order to maintain a scan over the width of the fabric.   16. Loom according to one of claims 9 to 15, characterized in that the holding element is a coating means for fixing on the reverse side of the fabric shaved son with an adhesive.   17. Loom according to claim 16, characterized in that the glue is PVC type and allows for a back-back.   18. Loom according to claim 9 to 16, characterized in that it comprises a forming element of a back-back (212) on the back side s (13) of the fabric (1) comprising a roller (212a ), a protruding element (212b) placed above the backside of the fabric to place the back-back and a support element (212c) disposed under the face of the fabric facing the backing. with respect to the projecting element (212b) for supporting the tissue during the installation of the back-back.   to 19. Loom according to one of claims 9 to 16 and 18, characterized in that the element for placing a back-back, placing a back-type gauze or foam, is disposed after the element keeping.   20. Loom according to one of claims 9 to 16 and 18, characterized in that the element for placing a back-back, placing a pre-coated fabric back-type, is arranged before the holding member, the holding member for melting the glue of the pre-coated fabric on the shaved son.   21. Loom according to claim 9 to 20, characterized in that it comprises a computer system (22) connected to the weaving device (20) and the ennobling device (21), the computer system (22) operating according to the ennobling process.   22. Loom according to one of claims 9 to 21, characterized in that the weaving device (20) comprises a front beam (201) comprising a ply of ropes (10), wound on a reeling roll by a mechanism of driving (202) the web of ropes (10) to provide the loom as it weaves the fabric (1), lices (203a, 203n) periodically opening the web of ropes (10) thus defining a shed (204) in which weft threads are successively inserted by means of a transverse movement insertion means, a comb (205) pressing against the fabric (1) the wefts formed by a movement of striking a comb (205) forming a seam (206), a rear beam (208) for winding the fabric (1) woven by a drive mechanism (209).