Proportional escapement apparatus for a single element typewriter

Claim 1

ESCAPEMENT APPARATUS FOR USE IN TYPEWRITER COMPRISING: A TYPEWRITER FRAME AND ATYPEWRITER CARRIER; A SINGLE PRINT ELEMENT HAVING CHARACTERISTICS THEREON REMOVABLY MOUNTED ON SAID CARRIER; CHARACTER SELECTION MEANS FOR MOVING SAID PRINT ELEMENT TO BRING A SELECTED CHARACTER INTO PRINTING POSITION; MEANS TO ROCK SAID PRINT ELEMENT TO MOVE SAID PRINT ELEMENT IN A DIRECTION TO EFFECT PRINTING OF A CHARACTER IN SAID PRINTING POSITION; AN ELONGAED LEAD SCREW SUPPORTED IN SAID FRAME AND HAVING A DRIVING CONNECTION WITH SAID CARRIER TO CONTROL MOVEMENT OF SAID CARRIER AND SAID PRINT ELEMENT WITH RESPECT TO SAID FRAME; DRIVE MEANS OPERATIVELY CONNECTED TO AND LOCATED ADJACENT ONE END OF SAID LEAD SCREW TENDING TO ROTATE THE SAME IN ONE DIRECTION; A GENERALLY CIRCULAR DISC SHAPED PIN WHEEL CARRYING A PLURALITY OF PINS LOCATED ADJACENT THE OTHER END OF SAID LEAD SCREW; A PLURALITY OF SELECTABLE GEAR MEANS EACH OPERATIVE WHEN SELECTED TO DRIVINGLY INTERCONNECT SAID LEAD SCREW AND SAID PIN WHEEL; EACH OF SAID PINS BEING MOVABLE TO AT LEAST TWO POSITIONS DEFINING AT LEAST TWO STATES AND THE DISTANCE BETWEEN ADJACENT PINS DEFINING A BASIC ESCAPEMENT UNIT; A PLURALITY OF CHARACTER KEYLEVERS EACH ASSOCIATED WITH AT LEAST ONE OF THE CHARACTERS TO BE PRINTED; A PIN SETTING ASSEMBLY LOCATED ADJACENT SAID PIN WHEEL FOR MOVING AND MAINTAINING THE PINS ADJACENT SAID PIN SETTING ASSEMBLY IN SELECTED STATES; AN ESCAPEMENT ASSEMBLY COMPRISING AN ESCAPEMENT PAWL MOUNTED FOR PIVOTAL AND LIMITED LONGITUDINAL MOVEMENT FOR ENGAGING THOSE OF SAID PINS IN ONE OF SAID STATES TO HOLD SAID PIN WHEEL AGAINST ROTATION BY SAID DRIVE MEANS;