| 摘要 |
PURPOSE:To reduce impact sound as possible and to attain to enhance printing quality by stabilizing the operation of an armature, by constituting a stopper, to which the armature is impacted when returned to the initial non-operative position after driving by a restoring spring, from acrylic rubber. CONSTITUTION:A restoring spring 10 for returning an armature 14 to the initial position after driving is elastically mounted between a rear part guide 9 and the armature 14 while a stopper 15 is arranged behind the armature 14 and the retraction of the armature 14 is stopped by the impaction thereof to the stopper 15. The stopper 15 is formed into a disc shape and grooves inlaid with the armature 14 are radially provided to the front side of said stopper 15 by drilling. In addition, the stopper 15 is formed of acrylic rubber having hardness of about 95 and fluorine substitution treatment due to fluorine gas is further applied to the surface thereof. |
