| 摘要 |
PURPOSE:To enable a desired printing density to be obtained by providing a yoke plate with a groove in which an armature fixed to a split piece may be inserted at the time of releasing the split piece of a leaf spring, and making the groove smaller than the width of the split piece. CONSTITUTION:A plate is fixed on the upper surface of a permanent magnet 3, and a spacer 6 is inserted between the plate and the ring-shaped part o a leaf spring 7 consisting of a plurality of split pieces 7a obtained by splitting centripetally so that the upper surface of the plate and the upper edge of a core of a magnet coil 4 may make a flat surface. Then the leaf spring 7 is allowed to be deviated by the width of the plate. The split piece 7a deviated by the core 2 is released from the core 2 by energization of the magnet coil 4. Consequently, printing wire 9 fixed to an armature 8 sticks out of a guide frame 13 to press ink ribbon against printing paper strongly. This permits dots to be printed on the printing paper. Under an energization state, a gap between the leaf spring 7 and the core 2 is equal to the plate thickness of the spacer 6, which makes the stroke of the printing wire 9 constant. As a result, the density of printing does not become irregular among N pieces of printing wire. |
