Variable force hammer high speed printer

Claim 1

IN A HIGH SPEED PRINTING DEVICE INCLUDING A MOVABLE PRINTING SURFACE AND A PLURALITY OF PRINTING HAMMER ASSEMBLIES, EACH HAMMER ASSEMBLY INCLUDING A BACKSTOP; A HAMMER MOUNTED FOR MOVEMENT BETWEEN SAID PRINTING SURFACE AND SAID BACKSTOP; MEANS NORMALLY URGING SAID HAMMER INTO ENGAGEMENT WITH SAID BACKSTOP; MEANS APPLYING A FIRST FORCE TO SAID HAMMER IN A DIRECTION FOR PROPELLING IT AGAINST SAID PRINTING SURFACE FOR A DURATION WHICH EXTENDS BEYOND THE TIME SAID HAMMER STRIKES SAID PRINTING SURFACE TO THEREBY REDUCE THE REBOUND VELOCITY OF SAID HAMMER; SAID MEANS FOR APPLYING SAID FIRST FORCE TO SAID HAMMER INCLUDING A FIRST ENERGIZABLE MEANS CARRIED BY SAID HAMMER FOR PRODUCING A FIRST MAGNETIC FIELD AND A SECOND MEANS FIXED RELATIVE TO SAID HAMMER FOR PRODUCILNG A SECOND MAGNETIC FIELD AND MEANS FOR SELECTIVELY ENERGIZING SAID FIRST MEANS TO THEREBY CAUSE SAID FRIST AND SECOND MAGNETIC FIELD TO INTERACT.