| 摘要 |
PURPOSE:To enable high speed printing and to minimize the abrasion of fulcrum by moving an armature from a first fulcrum to a second fulcrum as an armature is rocked by means of an electromagnet. CONSTITUTION:When a current is fed to a coil 3-2 so as to excite an electromagnet 3, one end side 1c of an armature 1 is attracted by the electromagnet 3 and starts rocking in the direction of an arrow (a) around a first fulcrum P1. At a time point when the armature 1 arrives to a printing position shown by a dashed, line 1-1, the fulcrum of the armature 1 moves to a second point P2. A print wire 2 is interlocked with the rocking motion of said armature 1 to move in the direction of the arrow (a) thus performing the printing operation. Upon completion of printing operation, power supply to the coil 3-2 is interrupted to eliminate the magnetic force of the electromagnet 3, thereby the armature 1 starts rocking in the direction of an arrow (b) around the second fulcrum P2 and moves to the first fulcrum P1 when it is reset to the original non-printing position. Such rocking motion of the armature 1 causes reciprocal motion of the wire 2 in the direction of arrows (a), (b) thus performing the printing. |
