Weaving machine, method for simultaneously weaving two pile fabrics on such a machine and pile fabric obtainable with such a method

A method for simultaneously weaving a top pile fabric and a bottom pile fabric, each fabric presenting pile printed patterns and including

• tufts made from pile warp yarns,
• binding warp yarns and
• weft yarns,
• this method taking place on a face-to-face weaving machine which comprises:
• a pile warp yarns feeding unit,
• a binding warp yarns feeding unit,
• a shedding unit for creating a shed with the pile warp yarns and the binding warp yarns, said pile warp yarns for the top pile fabric and for the bottom pile fabric forming a warp sheet made by juxtaposition of the pile warp yarns between the pile warp yarns feeding unit and the shedding unit, wherein the warp sheet consists of the pile warp yarns,
• a weft insertion unit for inserting the weft yarns in the shed in successive insertion cycles,
• a beating-up mechanism for beating-up the weft yarns into the shed,
• a take-up system for taking-up the two pile fabrics,
• a drawing-in unit for drawing the pile warp yarns from the pile warp yarn feeding unit and
• a control unit for controlling the weaving machine
• wherein the method includes at least the following steps:
• a) presenting the pile warp yarns to a treatment unit located, along a path of the warp sheet, between the pile warp yarns feeding unit and the shedding unit,
• b) applying, with the treatment unit, different segments of differently colored inks on at least some of the pile warp yarns of the top pile fabric and different segments of differently colored inks on at least some of the pile warp yarns of the bottom pile fabric,
• c) weaving the treated pile warp yarns into the top pile fabric and the bottom pile fabric, and
• d) simultaneously adjusting, in the warp sheet, a position of the segments of differently colored inks in the top pile fabric and the bottom pile fabric, this adjusting step further comprising at least:
• d1) taking a picture of the warp sheet and transferring the picture to the control unit which uses the picture to compute the position and/or length of the segments of differently colored inks along the pile warp yarns for the top pile fabric and to compute the position and/or length of the segments of differently colored inks along the pile warp yarns for the bottom pile fabric.