| 摘要 |
<p>A wire matrix printer includes a print head having banks of print wires arranged for linear reciprocation toward and away from a recording surface by associated actuators. Outer or actuator ends of the wires define a vertically spaced and stepped array with actuators also in an array vertically spaced and stepped and respectively coupled to the outer print wire ends by armatures. The inner or printing ends of the wires define a vertically spaced, nearly planar array near the recording surface, and a spaced, planar array at such surface. The banks are angularly spaced from a line extending perpendicularly from the recording surface, and the inner ends of the wires in each bank are alternately interleaved near the recording surface. The actuators in each bank also include torsion springs, pole pieces, a permanent magnet and an electrical coil about but not mechanically loading each armature. The pole pieces are magnetized by the permanent magnet to normally attract and hold each armature adjacent thereto against the action of its associated torsion spring, thereby storing potential energy therein. The flux of the permanent magnet is momentarily neutralized for a selected armature by energization of its associated coil to allow the armature too rotate on and about one of its pole pieces for impacting the inner end of the print wire couplet thereto against the recording surface due to conversion of the potential energy stored in the torsion spring to kinetic energy of the armature.</p> |
