| 摘要 |
PURPOSE:To enhance the suction torque of an armature by a magnetic force of a permanent magnet by having the armature opposite to the armature using a conical coil spring to energize the armature in the printing direction so that the spring is put out of a magnetic circuit. CONSTITUTION:A circular yoke 17 is fixed to a case 16, a doughnut-shaped permanent magnet 18 done on the circumference thereof 17 and a plurality of cores 19 done on the top thereof 18. These cores 19 takes such an L shape that the part where a coil 20 is mounted is equal in the sectional area with a larger area of a mounting base section 21 with respect to the permanent magnet 18. The attraction surface 22 of the cores 19 is chamferred 23 on one circumferential side thereof and the circumferential surface of the cores 19 is covered with a resin 24 with a high strength such as carbon-fiber-reinforced PPS. A fulcrum 26 of the resin 24 is formed on one external side of the attraction surface 22 to support an armature 25 linearly. |
