| 摘要 |
PURPOSE:To conserve power consumption for driving a coil by enhancing the magnetic flux density of a side magnetic path by reducing the clearance between the guide groove of an armature guide and an armature to enhance the attraction force of the coil, by forming the side magnetic path by forming the armature guide from a magnetic material. CONSTITUTION:Because an armature 20 is attracted to a core 18 when a coil 17 is excited, the armature 20 is revolved around a fulcrum 26 and a needle 25 is collided with a platen to perform printing. At this time, a magnetic path of core 18 armature 20 Yoke 16 core 18 is formed while a side magnetic path of (peripheral edge of armature 20) (opening edge of guide groove 30) armature guide 27 yoke 16 is formed. As mentioned above, because the side magnetic path is formed by an armature guide 27 formed of a magnetic material, the clearance between the armature 20 and the guide groove 30 can be reduced. Further, because the enlarged open edge 23 of the armature 20 is contacted with the partial edge 35 of the opening edge of the guide groove 30 by the elasticity of the needle 25, the permeability between the armature 20 and the armature guide 27 is high and magnetic flux density can be enhanced. |
