| 摘要 |
An improved impact dot printing head in which a printing needle is secured more firmly to an armature than ever, particularly they are secured or soldered to each other at their mating portions by way of a solder material selected from nickel and nickel alloys, and a method of producing the printing head in which either an armature or a printing needle is plated, at least a mating portion thereof with the other, with such a solder material, and then they are assembled to each other and then the assembly is heated in a furnace so as to effect soldering of the printing needle to the armature with the solder material.
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