Print hammer assembly for high speed printers

Claim 1

A PRINT HAMMER ASSEMBLY FOR A HIGH SPEED PRINTER COMPRISING A BAR HAVING A PRINT HAMMER AT ONE END THEREOF AND A PORTION OF MAGNETIC MATERIAL AT THE OPPOSITE END THEREOF, SAID BAR BEING INCLUDING MEANS FORMING A SPRING-MOUNTING SURFACE THAT IS SUBTANTIALLY PARALLEL TO THE AXIS OF THAT PORTION SAID BAR THAT IS ADJACENT SAID PRINT HAMMER, FRAME MEANS FORMED WITH A SPRING-MOUNTING SURFACE, AN ELECTROMAGNET MOUNTED IN SAID FRAME MEANS, SAID ELECTROMAGNET HAVING POLE PIECES ADJACENT SAID MAGNETIC PORTION AND BEING ADAPTED WHEN ENERGIZED TO PULL SAID MAGNETIC PORTION TOWARD SAID POLE PIECES, A LEAF SPRING HAVING OPPOSITE ENDS SECURED TO SAID SPRINGMOUNTING SURFACES OF SAID BAR AND SAID FRAME MEANS FOR CONNECTING SAID FRAME MEANS TO SAID BAR INTERMEDIATE THE ENDS OF SAID BAR FOR PIVOTAL MOVEMENT THEREOF AND FOR BIASING SAID BAR TOWARD A REST POSITION, SAID FRAME MEANS HAVING OPPOSED REST STOP MEANS AND PRINTING STOP MEANS COACTING WITH SAID BAR TO LIMIT SAID BAR TO PIVOTAL MOVEMENT BETWEEN A REST POSITION AND SAID PRINTING POSITION, SAID ELECTROMAGNET BEING CONSTRUCTED AND ARRANGED WHEN ENERGIZED TO PIVOT SAID BAR TO SAID PRINTING POSITION, SAID REST STOP BEING POSITIONED TO INCLINE SAID SPRING-MOUNTING SURFCACES WITH RESPECT TO ONE ANOTHER IN THE REST POSITION OF SAID BAR THEREBY TO FLEX SAID LEAF SPRING ABOUT SAID PIVOTAL AXIS INTO PRES-STRESSED CONDITION, BIASING SAID BAR AGAINST SAID REST STOP MEANS IN SAID REST POSITION TO PRE VENT REBOUND OF SAID BAR THEREFROM UPON A RETURN OF SAID BAR FROM SAID PRINTING POSITION.