Patent ID: 7048455

Claim:
A wire dot printer head, comprising: a plurality of printing wires; a plurality of armatures for supporting the printing wires respectively and having support shafts which are centers of pivoting respectively; a yoke having a plurality of cores around which coils have been wound respectively, and for holding the support shaft such that the armatures oppose to the cores respectively; an armature spacer provided on the yoke, having a plurality of cutouts for accommodating the support shafts, and for holding the support shaft together with the yoke; a hold-down member provided on the armature spacer, for holding down the support shaft; and an abrasion preventing member provided between the yoke and the armature spacer, for preventing the support shaft of the armature from coming into contact with the yoke, wherein the abrasion preventing member is formed of material having higher magnetic permeability than that of the yoke, and a surface thereof has been hardened so as to have higher surface hardness than that of the support shaft by hardening processing.