High speed print hammer and bar magnet means

Claim 1

IN A HIGH SPEED PRINTING APPARATUS INCLUDING A PLU RALITY OF IMPACT DEVICES, EACH DEVICE HAVING MEANS THEREON FOR SELECTIVELY GENERATING A MAGNETIC FIELD, AN ASSEMBLY FOR PROVIDING A PERMANENT MAGNETIC FIELD ADAPTED TO INTERACT WITH SAID SELECTIVELY GENERATED MAGNETIC FIELD, SAID ASSEMBLY COMPRISING A BASE FORMED OF A NONMAGNETIC MATERIAL AND HAVING AN INVERTED T-SHAPED CROSS-SECTION DEFINING AN UPWARDLY EXTENDING CENTRAL BAR AND FIRST AND SECOND SHOULDERS EXTENDING SUBSTANTIALLY PERPENDICULARLY THEREFROM; A PLURALITY OF EQUQLLY SPACED SLOTS DEFINED IN SAID CENTRAL BAR EXTENDING SUBSTANTIALLY PERPENDICULARLY THERETO; A PLURALITY OF PERMANENT BAR MAGNETS EACH HAVING FIRST AND SECOND SUBSTANTIALLY PERPENDICULAR SURFACES; MEANS SECURING SAID BAR MAGNETS TO SAID BASE IN PHYSICAL ALIGNMENT AND IN SERIES MAGNETICALLY WITH SAID FIRST AND SECOND SURFACES OF EACH OF SAID BAR MAGNETS RESPECTIVELY ENGAGING SAID CENTRAL BAR AND ONE OF SAID SHOULDERS; SPACED DEFINED BETWEEN EACH PAIR OF ADJACENT BAR MAGNETS IN ALINGNMENT WITH A DIFFERENT ONE OF SAID SLOTS; EACH OF SAID MEANS FOR SELECTIVELY GENERATING A MAGNETIC FIELD EXTENDING INTO A DIFFERENT ONE OF SAID SPACES AND THE SLOT ALIGNED THEREWITH.