Wire print head

Claim 1

In a wire print device of the type having a circular frame, and a plurality of wire print assembly members mounted within said frame, with each of said wire print assembly members comprising a solenoid having a central core member which has a pole face at one end thereof and movable armature means, the improvement wherein said movable armature means comprises a. a flexible leaf spring member mounted in cantilever fashion adjacent one end thereof to said frame, said spring member extending substantially radially of the frame from its point of attachment to the center of the device, b. a lightweight magnetizable member mounted on said flexible leaf spring member, 1. said lightweight magnetizable member having a cross sectional area substantially equal to the cross-sectional area of the pole face on said central core member, c. and a print wire attached to the uncantilevered end of said flexible leaf spring member, said print wire having a length to diameter ratio of less than 60:1, said print wire being guided by a jeweled lining carried by said frame d. said lightweight magnetizable member being mounted closer to the cantilever mounting of said flexible spring member than to said print wire so as to establish a mechanical advantage for the movement of said print wire when said solenoid is actuated to effect movement between said magnetizable member and said pole face by magnetic attraction and repulsion.