BALLISTIC PRINT WIRE ACTUATOR USING A TELESCOPIC ARMATURE

摘要

BALLISTIC PRINT WIRE ACTUATOR USING A TELESCOPIC ARMATURE A print wire actuator using a telescopic armature pair is presented. The actuator is disposed to propel a print wire through a predetermined distance from a rest position toward a recording medium. The armature pair moves by electromagnetic force over a first portion of the predetermined distance at which point one piece of the armature reaches a mechanical stop. The second piece of the armature continues to move, both ballistically and magnetically, over the remaining portion of the predetermined distance.