| 摘要 |
PURPOSE:To obtain a wire dot type printer head without external leakage of magnetic flux by incorporating all permanent magnets into a frame. CONSTITUTION:A head of a wire dot type printer comprises a ring-shaped magnet 1 radially magnetized, a base plate 15 contacting the inside thereof, a coil 5 provided with a core 4 fastented thereon, a magnetic cylindrical frame 16 provided outside the magnet 1, a nonmagnetic cover plate 17 covering the frame 16, the magnet 1 and the base plate 15, a spacer 7 provided on the surface of the frame 16 to provide a gap between the core 4 and a mobile piece, a spring 8 thereon, several armatures 10 fastened on several protruded parts at the center thereof, yokes 9 surrounding thereof, a wire 13 fastened on the center side of the head of the armature 10, a wire guide 12 supporting them, a frame 16 supporting it and the like. |
