| 摘要 |
PURPOSE:To prevent the direct impact of a plunger and a core and to extend life by suppressing abrasion, by making the end surface of a yoke flush with that of the core and arranging a spacer so as to hold the same between said end surfaces and the end surfaces of both of the plunger and a side yoke. CONSTITUTION:At the time of the finish of printing, a plunger 3 is attracted to a permanent magnet by the finish of the supply of a current to an electromagnetic coil 2 and collides with a core 5 through a spacer 1 but, because of the spacer 1, the plunger 3 and the core 5 avoid direct collision to be kept from abrasion. The spacer 1 is also stretched between a side yoke 11 and a yoke 10 and, since the end surface 10a of the yoke 10 is made flush with the end surface 5a of the core 5, the attraction displacement of the plunger largely exerting effect on printing capacity is made stable. |
