Print Wire Return Spring
Original Publication Date: 1985-Jan-01
Included in the Prior Art Database: 2005-Feb-18
In a serial wire matrix printer like that shown in [*], single spring 10 provides separate sections 11 and 12, for respectively providing restoring force to print wire 13 and to magnet armature 14 that acts on print-wire head 15. Shoulder 16 takes the reaction of both sections 11 and 12. Shoulder 17 on wire head 15 engages the lower end of spring section 12. Thus, print wire 13 can be driven by armature 14 through its initial power stroke and continue ballistically to the point of print impact by stretching spring section 12. Following impact, spring section 12 serves to restore the print wire to its initial position. Spring section 11 acts as a conventional compression spring to return armature 14 to its initial position. Reference [*] J. H. Meier and G. H.