Pressure control means for print hammers

Claim 1

IN A PRINTING MECHANISM; (A) MEANS CARRYING A FONT OF TYPE CHARACTERS OF VARYING SURFACE AREAS; (B) MEANS MOUNTING SAID FONT CARRYING MEANS WHEREBY INDIVIDUAL ONES OF SAID FONT CHARACTERS MAY SELECTIVELY BE MOVED INTO POSITION FOR PRINTING; (C) OPERABLE KEY ELEMENTS, ONE FOR EACH FONT CHARACTER; (D) ELONGATED RACK MEANS MOVABLE TO POSITIONS DETERMINED BY ACUTATION OF ONE OF SAID KEY ELEMENTS; (E) MEANS INTERCONNECTING SAID RACK MEANS AND SAID FONT CARRYING MEANS WHEREBY MOVEMENT OF SAID RACK MEANS TO A KEY DETERMINED POSITION EFFECTS MOVEMENT OF SAID FONT CARRYING MEANS TO PRESENT THE FONT CHARACTER CORRESPONDING TO AN ACTUATED KEY ELEMENT INTO PRINTING POSITION; (F) PLATEN MEANS POSITIONED TO BE DRIVEN AGAINST SAID FONT CARRYING MEANS TO PRINT THE SAID PRESENTED FONT CHARACTER ON A PRINTABLE MEDIUM POSITIONED BETWEEN SAID PLATEN AND SAID FONT CARRYING MEANS; (G) HAMMER MEANS POSITIONED FOR DRIVING SAID PLATEN MEANS; (H) SPRING MEANS FOR DRIVING SAID HAMMER MEANS; (I) MEANS CONNECTING ONE END OF SAID SPRING TO SAID HAMMER MEANS; (J) MOVABLE MEANS ANCHORING THE OTHER END OF SAID SPRING; AND (K) MEANS FOR ADJUSTING THE SPRING FORCE WITH WHICH THE HAMMER MEANS DRIVES SAID PLATEN MEANS, SAID ADJUSTMENT BEING IN ACCORDANCE WITH THE SURFACE AREA OF THE FONT CHARACTER TO BE PRINTED; (L) SAID ADJUSTING MEANS COMPRISING, (A) NOTCHES ALIGNED ALONG SAID RACK MEANS AND DIFFERENTIALLY SPACED IN ACCORDANCE WITH THE DIFFERENT SURFACE AREA OF SAID FONT CHARACTERS, AND (B) SENSING MEANS POSITIONED TO MOVE AGAINST THE NOTCH CORRESPONDING TO THE FONT CHARACTER POSITIONED IN PRINTING POSITION BY SAID RACK MEANS, (C) SAID SENSING MEANS HAVING MEANS MOVABLE SIMULTANEOUS WITH ITS SENSING MOVEMENT TO STOP THE MOVEMENT OF SAID ANCHOR MEANS AND ADJUST SAID SPRING FORCE IN ACCORDANCE WITH THE AMOUNT OF MOVEMENT OF SAID SENSING MEANS TO A PARTICULAR NOTCH ON SAID RACK MEANS WHEREBY IN EFFECT THE FORCE OF SAID SPRING IS ADJUSTED AN AMOUNT CORRESPONDING TO THE RELATIVE AREA OF THE FONT CHARACTER IN PRINTING POSITION.