Method and Plant for Printing a Chain of Warp Yarns

Abstract

An anchorage guide for a trocar including a tubular body, formed by a plurality of substantially circular sectors, radially moveable from and towards the longitudinal axis of the tubular body between a first position, at which the circular sectors flank each other according to a first substantially circular arrangement with a diameter equal to that of the tubular body, and a second position, at which the circular sectors result equidistant from each other according to a second substantially circular arrangement of greater diameter than that of the first arrangement. Each of the circular sectors is rotatably connected to a support element and a manual operation mechanism, moveably connected to the support element, moves the circular sectors from the first to the second position and vice versa.

1 - 33 . (canceled) 
   
   
       34 . A method for printing a chain of warp yarns by spraying ink onto the chain of yarns to produce thereon a predetermined decorative motif, the method comprising:
 unwinding the chain of warp yarns from a first beam;   measuring tension of the chain yarns, and regulating their tensioning to maintain the tensioning within a predetermined range;   depositing the chain of warp yarns parallel with each other on an adhesive belt;   guiding the chain of warp yarns to a plotter;   spraying ink by the plotter;   rewinding the chain of warp yarns on a second beam; and   feeding the second beam to a loom to weave the printing chain of warp yarns with weft yarns to obtain a fabric.   
   
   
       35 . A method as claimed in  claim 34 , wherein after receiving the ink the yarn chain is dried, and before the spraying ink, the yarn chain is impregnated with a product facilitating ink absorption. 
   
   
       36 . A method as claimed in  claim 35 , wherein the yarn chain is impregnated by immersion in a tank containing the product, and after immersion, the yarn chain is subjected to wringing, and after the wringing, the yarn chain is dried. 
   
   
       37 . A method as claimed in  claim 36 , wherein the measuring the tension of the chain yarns is made before their impregnation. 
   
   
       38 . A method as claimed in  claim 36 , wherein the measuring the tension of the chain yarns is made after the drying. 
   
   
       39 . A plant for printing a chain of warp yarns, comprising:
 means for feeding the yarn chain to an ink application device including means for spraying ink onto the chain to reproduce a predetermined motif;   a first beam where the chain of warp yarns are wound, the first beam housed on a support rotatable by a first motor;   a first sensor disposed downstream of the first beam, for measuring tension of the chain yarns to controlling their tensioning to maintain the tensioning within a predetermined range;   an adhesive belt for conveying the chain of warp yarns parallel with each other from the first beam to the means for spraying ink, the adhesive belt being operable by at least one second motor;   the means for spraying ink including a plotter of ink jet type; and   a second beam where the chain of warp yarns are rewound.   
   
   
       40 . A plant as claimed in  claim 39 , wherein the first motor and second motor are connected to a plant operation control unit. 
   
   
       41 . A plant as claimed in  claim 39 , wherein the second motor is connected to the plotter that controls its operation, the plotter being connected to a plant operation control unit and to a PC for transmitting all data relative to the printing. 
   
   
       42 . A plant as claimed in  claim 39 , further comprising a drying device, positioned downstream of the plotter, to dry the portions of chain yarns leaving the plotter. 
   
   
       43 . A plant as claimed in  claim 39 , further comprising, upstream of the plotter, a yarn chain impregnation device for impregnating the yarns with a product facilitating ink absorption, by including, downstream of the impregnation device, a wringing device for removing any excess product from the chain yarns, and wherein the wringing device includes a pair of rollers rotatable by at least one third motor connected to a plant operation control unit, the rollers being mutually associated along one of their generating lines such that during operation, the chain yarns are pressed between the mutually associated rollers. 
   
   
       44 . A plant as claimed in  claim 43 , further comprising, for measuring the tension of the chain yarns, a second sensor disposed upstream of the impregnation device, the second sensor being connected to a plant operation control unit. 
   
   
       45 . A plant as claimed in  claim 43 , further comprising a drying device positioned downstream of the wringing device. 
   
   
       46 . A plant as claimed  claim 45 , wherein the first sensor is positioned downstream of the drying device. 
   
   
       47 . A plant as claimed  claim 40 , wherein the first sensor is connected to the plant operation control unit. 
   
   
       48 . A plant as claimed  claim 39 , wherein the second beam is housed on a support rotatable by a fourth motor connected to a tension measuring sensor. 
   
   
       49 . A plant as claimed in  claim 43 , wherein the impregnation device includes a roller over which the chain yarns slide, the roller being immersed in the impregnating product and entraining the impregnating product during rotation, to wet the chain yarns. 
   
   
       50 . A plant as claimed in  claim 43 , wherein the impregnation device includes fixed or movable spray nozzles that spray the impregnating product onto the chain yarns. 
   
   
       51 . A plant as claimed in  claim 39 , wherein the first sensor is connected to the first motor. 
   
   
       52 . A plant as claimed  claim 43 , further comprising:
 software for controlling the plant and including means for controlling printing by the means for spraying ink and regulator means for operating the first, the second, and the third motors feeding the chain yarns from the first beam to the means for spraying ink in relation to a printing speed of the means for spraying ink;   a second chain yarn tension sensor disposed upstream of the impregnation device, the software presenting means for acquiring, from the second sensor, values indicative of the tension of the chain yarns; and   means for regulating the speed of at least the second and third motors, to maintain the tension measured by the second sensor within a predetermined range.   
   
   
       53 . A plant as claimed in  claim 52 , wherein the software further comprises means for acquiring, from the first sensor, values indicative of the tension chain yarns, and means for regulating the speed of at least the second motor, to maintain the tension measured by the first sensor within a predetermined range.