Patent ID: 7461986
Filing Date: 2008-12-09
Classification: B41J

Abstract:
1. A wire dot printer head, comprising: a plurality of printing wires; a plurality of armatures for supporting the printing wires, respectively, at respective first ends of the armatures; a yoke having a base, a cylindrical portion provided on an outer peripheral side of the base, an annular interior on an interior side of the cylindrical portion, and a plurality of cores which are arranged in the annular interior and around which coils have been wound, respectively; a holding mechanism for holding respective second ends of the armatures on the cylindrical portion of the yoke such that the armatures are swingable at positions opposite to the cores, respectively; and an abrasion preventing member provided on the cylindrical portion to prevent the armature from coming into direct contact with the yoke, wherein the abrasion preventing member is formed of a material having a magnetic permeability that is higher than a magnetic permeability of the yoke, and wherein a surface of the abrasion preventing member has been hardened by a hardening processing so as to have a higher surface hardness than a surface hardness of a portion of each of the second ends of the armatures that comes into contact with the surface of the abrasion preventing member.