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Linear Electromagnetic Print Wire Actuator Disclosure Number: IPCOM000040134D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01

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Harris, RH Thorne, WD [+details]


A linear electromagnetic actuator for wire matrix impact print mechanisms is described. The actuator has a low mass armature and a design that generates maximum print wire force at the beginning of the stroke. A working gap is at the center of the electromagnetic coil instead of at the end poles, and a simplified structure lends itself to easy automatic assembly. Fig. 1 illustrates a horizontal cross-sectional elevational view taken through a single linear electromagnetic actuator structure. A print wire 1 is attached to a movable armature 2 which is in the form of a soft silicon iron ring of low mass. An insert 3 is molded on either face of the ring armature 2 to act as a guide.