Abstract: A mold head device of a spring forming machine is disclosed. The mold head device includes a rotation mechanism controlling rotation of a rotation head and a linear motion mechanism controlling linear motion of a mold head. The mold head has a plurality of sector-shaped chunk blocks defining diametrically extending channels therebetween for accommodating a spring wire that makes springs. Each chunk block has circumferentially opposite rounded corners having different radii of curvature. The rotation head has a projection engaging and applying a bending force to the wire so as to bend the wire about one of corners of the chunk blocks thereby forming an arc bending of the wire having a radius of curvature corresponding to that of the corner.

Abstract: A mold head device of a spring forming machine is disclosed. The mold head device includes a rotation mechanism controlling rotation of a rotation head and a linear motion mechanism controlling linear motion of a mold head. The mold head has a plurality of sector-shaped chunk blocks defining diametrically extending channels therebetween for accommodating a spring wire that makes springs. Each chunk block has circumferentially opposite rounded corners having different radii of curvature. The rotation head has a projection engaging and applying a bending force to the wire so as to bend the wire about one of corners of the chunk blocks thereby forming an arc bending of the wire having a radius of curvature corresponding to that of the corner.