| 摘要 |
PURPOSE:To reduce the error of the degree of flatness at both end surfaces of a main yoke and the core and to enhance the accuracy of the gap between a plunger and a core, by constituting the title printing head of the main yoke and an auxiliary yoke and forming the end surface of the main yoke and that of the core on the same plane. CONSTITUTION:A printing head is constituted of a main yoke 5 and an auxiliary yoke 9, and the end surface 5a of the main yoke 5 and the end surface 6a of a core 6 are formed so as to be positioned on the same plane and, therefore, the error of the degree of flatness of each of the end surfaces 5a, 6a can be reduced and the dimensional accuracy of the auxiliary yoke 9 and a plunger 14 is easy to secure and the gap between the plunger 14 and the core 6 can be made highly accurate. Since an armature 13 is arranged so as to be contacted with and opposed to the core, the length of the plunger 14 is shortened to make it possible to achieve wt. reduction and, further, offset force is eliminated because magnetic flux to the plunger 14 passes through the armature 13. By this constitution, high speed response, printing quality, durability and reliability can be enhanced. |
