| 摘要 |
<p>Print wire solenoid for use in a wire matrix print head including a housing member (22) enclosing a coil assembly (46, 58, 66, 74) which in turn includes an elongated plunger (78) slidably mounted within the coil assembly (46, 58, 66, 74) for reciprocal movement between a home and actuated position. A print wire (84) affixed to one end of the plunger (78) is moved to a printing position upon movement of the plunger (78) to the actuated position. A compression spring (94) mounted within the coil assembly (46, 58, 66, 74) normally urges the plunger (78) to the home position where it engages an impact disc (76) composed of an elastomeric material. The impact disc (76) together with a cap member (34) are held in a position adjacent the plunger by a retainer spring (32) removably secured to the housing member (22). The retainer spring (32) is held in a bowed configuration by the cap member (34), thereby preloading the cap member (34) and the impact disc (76) for help in absorbing the rebound movement of the plunger (78) while retaining the cap member (34) and the impact disc (76) together with the coil assembly (46, 58, 66, 74) in correct registration within the housing member (22). The retainer spring (32) is easily disengaged from the housing member (22) allowing for the quick disassembly of the solenoid. </p> |
