| 摘要 |
PURPOSE:To provide a dot printer which can be assembled and adjusted more easily and is enhanced in reliability, by a construction wherein variations in a magnetic attractive force and moment depending on the stroke of an armature by a magnetic force means are set to be as small as possible, and variations in the magnetic attractive force and moment for the armature by a yoke is enlarged. CONSTITUTION:On the upper side of a lower yoke 30 of an electromagnet, a flat plate ring form permanent magnet 35 as the magnetic force means is fixed to an upper yoke 36. A base part 36a corresponding to the lower yoke 30 is provided at the end part of the upper yoke 36, and is brought into contact with an outer base part 31 of the lower yoke 30 to achieve magnetic coupling with the latter. The armature 39 is provided between a magnetic pole piece 37 and the lower yoke 30, and an end part 39a thereof is located on an upper surface 32a of a central base part 32 of the lower yoke 30 so that the armature 39 can be angularly displaced with the end part 39a thereof as a fulcrum. An O-ring form elastic member 38 is provided between the armature 39 and the magnetic pole piece 37. |
