Carrier mechanism for proportional escapement typewriter

Claim 1

CARRIER MECHANISM FOR A TYPEWRITER COMPRISING A TYPEWRITER FRAME AND A CARRIER; A LEAD SCREW HAVING A THREAD THEREON ROTATABLY SUPPORTED IN SAID FRAME; A FOLLOWER ENGAGING SAID LEAD SCREW; MEANS MOUNTING SAID FOLLOWER ON SAID CARRIER FOR PIVOTAL MOVEMENT RELATIVE TO SAID MOUNTING MEANS IN ONE ROTATIONAL DIRECTION; STOP MEANS ON SAID MOUNTING MEANS FOR PREVENTING PIVOTAL MOVEMENT OF SAID FOLLOWER IN THE OTHER ROTATIONAL DIRECTION RELATIVE TO SAID MOUNTING MEANS TO CAUSE SAID FOLLOWER, SAID MOUNTING MEANS AND SAID CARRIER TO MOVE IN ONE LONGITUDINAL DIRECTION AS SAID LEAD SCREW ROTATES RELATIVE TO SAID FOLLOWER IN A DIRECTION TO PIVOT SAID FOLLOWER IN SAID OTHER ROTATIONAL DIRECTION; SAID FOLLOWER HAVING AN ELONGATED SURFACE; MEANS TO APPLY A FORCE TO SAID CARRIER FOR MOVING THE SAME IN A SECOND LONGITUDINAL DIRECTION OPPOSITE TO SAID ONE LONGITUDINAL DIRECTION TO PIVOT SAID FOLLOW IN SAID ONE ROTATIONAL DIRECTION; AND SAID ELONGATED SURFACE ENGAGING AND SPANNING AT LEAST TWO TURNS OF SAID THREAD ON SAID LEAD SCREW WHEN SAID CARRIER MOVES IN SAID SECOND LONGITUDINAL DIRECTION.