Magnetic actuated hammers in a line printer

Claim 1

A LINE PRINTER COMPRISING A ROLLER STRUCTURE MOUNTED TURN ABOUT AN AXIS AND HAVING A SERIES OF DIFFERENT PRINTING PORITIONS POSITIONED TO PRINT CHARACTERS AT A SERIES OF DIFFERENT PREDETERMINED SPACED RESPECTIVELY ALONG A LINE, INDIVIDUAL ONES OF SAID PORTIONS HAVING A NUMBER OF DIFFERENT TYPE ELEMENTS AT DIFFERENT LOCATION CIRCULARLY ABOUT THE ROLLER STRUCTURE TO PRINT DIFFERENT CHARACTERS, MEANS FOR ADVANCING A PAPER RELATIVE TO SAID ROLLER STRUCTURE TO PRINT SUCCESSIVE LINES THEREON, A SERIS OF STRIKING ELEMENTS POSITIONED TO STRIKE SAID PAPER AGAINST SAID DIFFERENT PORTIONS OF THE ROLLER STRUCTURE RESPECTIVELY AND MOUNTED FOR MOVEMENT RELATIVE TO ONE ANOTHER AND TOWARD AND AWAY FROM SAID ROLLER STRUCTURE BETWEEN RETRACTED AND STRIKING POSITIONS, A SERIES OF YIELDING MEANS OPERABLE TO YIELDINGLY URGE SAID STRIKING ELEMENTS RESPECTIVELY TOWARD SAID DIFFERENT PORTIONS OF THE ROLLER STRUCTURE, A SERIES OF MAGNETIC HOLDING UNITS OPERABLE TO MAGNETICALLY RETAIN SAID DFIFFERENT STRIKING ELEMENTS RESPECTIVELY IN RETRACTED POSITIONS AND ELECTRICALLY RELEASABLE SEPARATELY BY PREDETERMINED SIGNALS TO RELEASE SAID STRIKING ELEMENTS FOR SEPARATE STRIKING MOVEMENTS UNDER THE INFLUENCE OF SAID YIELDING MEANS, FOLLOWED FOR RETRACTING MOVEMENT OF THE STRIKING ELEMENTS, MEANS FOR PARTIALLY RELIEVING THE FORCE OF SAID YIELDING MEANS FOLLOWING STRIKING MOVEMENT OF AN ASSOCIATED STRIKING ELEMENTS TO FACILITATE RETRACTING MOVEMENT OF THE LATTER, AND MEANS FOR COCKING SAID YIELDING MEANS TO INCREASE THE FORCE THEREOF AFTER SAID RETRACTING MOVEMENT OF THE STRIKING ELEMENT.