| 摘要 |
PURPOSE:To involve the force of an auxiliary spring in addition to the force of a leaf spring to shorten a time required for displacement by fixing the auxiliary spring to a yoke and give supplementary spring force by the auxiliary spring to the leaf spring in a direction where the leaf spring separates from the yoke. CONSTITUTION:An auxiliary spring 41 is fixed with a screw 42 near the edge of a permanent magnet 24 at an external leg 23. The auxiliary spring 41 curves toward the inside of a radial direction with the other end contacting a leaf spring 29. Accordingly the auxiliary spring 41 gives supplementary spring force to the leaf spring 29 in the second housing direction. An armature 34 is displaced in a direction where it separates from a magnetic polar surface 22a by the spring force of both leaf spring 29 and auxiliary spring 41 involved. Thus a printing wire 36 is displaced in an arrow J direction to perform printing operation. An impact caused by the collision of the polar surface 34a of the armature 34 which begins a return operation with the magnetic polar surface 22a is reduced. |
