| 摘要 |
According to a dot head of the invention, an armature structure for moving a printing needle forward and backward has the efficiency that the magnetic characteristics is excellent and mechanical intensity is high. The armature structure is manufactured in a manner that an arm member, which is formed by subjecting a plate-shaped material excellent in abrasion resistance performance and having a high intensity to a plating processing using born etc., is sandwiched at a portion thereof from both sides in a stacked manner by two armature members each of which is formed by subjecting a plate-shaped material excellent in magnetic characteristics to a plating processing using born etc. A pin formed by subjecting a piano wire to a plating processing using boron etc. is inserted with a small pressure into common through holes of the two armature members and the arm member thus stacked thereby to provisionally assemble them. A pair of electrodes are made in contact to the portions including the slightly-pressed-in pin near the pin of the provisionally assembled two armature members and the arm member, and a current is supplied to the electrodes in a state that the portions are sandwiched by the electrodes thereby to melt and harden the plated portions using boron etc. to integrate the two armature members and the arm member.
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