the formation of the gussets 66 the same arm being angularly mounted for oscillation on the axis 81 orthogonal to the direction f of the ribbon 30 to be cut the latter being located below the fixed suction plate 7 the angular oscillation of the arm 80 which supports also the gripper 5 with the relevant support 51 and the actuator 50 the cutter unit 4 and the optical sensors 6 is operated by an actuator 82 to which a cantilevered appendix 800 of the arm 80 is associated the upward rotation of the arm 80 is intended for moving the suction plate 8 out of contact with the underlying plates 7 9 when the ribbon 30 is to be fed for cutting it as desired mounted above said plane p between the gripper 5 and the cutter 4 is a scraper 55 whose function is to prevent any waviness in the ribbon 30 sliding therebelow the scraper 55 being supported by the said arm 80 to insert the gussets 66 into the crotch region of the pantyhose article that is to transfer the gussets 66 to the shapes 2 from the exit section u the latter being located in correspondence of the front side 10 of the structure 1 and being delimited by a horizontal slit 11 of said side 10 a lamina 12 is used the said lamina 12 is mounted on a platform 13 disposed below said plane p of the structure 1 and is fixed to a frame 14 sliding onto the platform 13 from and to the said slit 11 of the structure 1.