Patent ID: 7645082
Filing Date: 2010-01-12
Classification: B41J

Abstract:
1. A dot head comprising: an armature structure which includes two armature members formed by subjecting a magnetic plate-shaped material to boron-based plating, and an arm member formed by subjecting a plate-shaped material made of steel to boron-based plating, wherein one end side of a printing needle is provided at a tip end of the arm member in a longitudinal direction of the arm member, wherein one side surface of each of the armature members is joined to a corresponding side surface of the arm member at a base end side of the arm member in the longitudinal direction, such that the two armature members are joined to both sides, respectively, of the arm member, and wherein plated portions of the joined parts of the two armature members and the arm member are melted together and hardened so that the plating on the armature members and arm member form an integrated and one-piece structure; a fulcrum shaft which pivotally supports a base end of the armature structure in a longitudinal direction thereof so as to be rotatable; and a core which opposes an intermediate portion of the armature structure in the longitudinal direction thereof and which is able to apply magnetic force to the intermediate portion arbitrarily.