The invention relates to a re-grinding machine for sewing a knit piece on a knit and comprises a sewing machine body (3) provided with a sewing device comprising in particular a sewing needle (5), a system (8). for supporting the knit piece and the knit, a mechanism (9) for relative movement between the support system (8) and the needle (5), a camera adapted to take an image of an area of the piece of knit fabric including the stitching needle stitching wire and the needle (5) and an image processing unit and controlling the movement mechanism and the stitching device.The machine comprises: - a mechanism (9) for moving relative to the fixed needle (5), the support system (8) of the knit piece and the knit, - and a support system (8) comprising means for holding together the knit piece and the knit in a fixed relative position.
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