the rotation of the flyer and are formed into a steel cord 3 the steel cord 3 which was given double twist is passed on the overtwist roller 69 for the purpose of stabilizing the repulsion of twist by passing on the overtwist roller 69 the steel cord 3 is given a stable twist by passing through the lay plate 72 steel wires which have already been given a twisting tendency are further given a tendency to open due to the cross sectional shape of the hole edges of the small holes made in the lay plate 72 and the tension of the open cord at this time the lay plate 72 is rotatable by the bearing 73 and turns naturally at the speed shown below and steel wires which pass through the lay plate 72 are again intertwisted at this time as the lay plate is given a torque by a slight component force in the torsional direction in the tension of the open cord in the case where smooth rotation is not obtained or the friction moment of the bearing 73 affects the residual torsion and the degree of openness the lay plate 72 may be turned positively by a torque motor or a braking device may be provided then the steel cord passes through the lay plate and is formed into an open cord as it is difficult to correspond the degree of openness of the open cord to the target.