apparatus to move toward sewing machine 132 for sewing and away from said sewing machine after the sewing has been completed the needle and its respective upper and lower guides 122 120 remain fixed but next to the sewing machine the apparatus is shifted by a properly programmed pantograph 134 in the direction perpendicular to the machine direction and it is engaged with proper small wheels 76 connected to the base next to the hinge 36 the fact that the movement along this direction is sufficient to move the apparatus and thus carry out the entire sewing process results from the fact that a piston is provided which acts on a pusher device 136 essentially an arm which pushes the apparatus in the machine direction whose action is controlled electronically two pusher devices 136 are provided to accommodate the different sizes of the apparatuses for the two ends of the tie in addition means are provided to allow that the movement of the apparatus occurs with an increasing velocity from the needle lower dead point to the needle dead tip in this way there is a minor curling of the fabric and greater work speeds can be maintained further the sewing stitch is maintained at a constant length also along the tip sides through the variation of the speed of the apparatus through a sensor system which acts.