Patent ID: 7278794

Claim:
A wire dot printer head, comprising: a printing wire; a core to which a coil is wound and which has a pole face; a yoke which supports the core, the core being formed integrally with the yoke; an armature which holds the printing wire, and which has an attracted face that is attracted by the core to contact the pole face and a pivot shaft serving as a center of pivoting of the armature; and a support plate member that abuts the pivot shaft, and which is positioned between the yoke and the pivot shaft to prevent contact between the yoke and the pivot shaft; wherein an attracting direction of attraction force acted on the attracted face by the core and a moving direction in which the attracted face moves due to the attraction force are substantially equal to each other; and wherein a surface of the support plate member is hardened by a hardening process, and the support plate member has a thickness such that a magnetic path between the core and the armature is formed with a shortest distance.