Tabulation apparatus for typewriter

Claim 1

TABULATION APPARATUS FOR USE WITH A PROPORTIONAL ESCAPEMENT TYPEWRITER COMPRISING: A TYPEWRITER FRAME AND A CARRIER; A SINGLE PRINT ELEMENT HAVING CHARACTERS FORMED THEREON MOVABLY MOUNTED ON SAID CARRIER; CHARACTER SELECTION APPARATUS FOR MOVING SAID PRINT ELEMENT TO BRING A SELECTED CHARACTER INTO PRINTING POSITION; AN ELONGATED LEAD SCREW ROTATABLY SUPPORTED IN SAID FRAME; DRIVE MEANS FOR ROTATING SAID LEAD SCREW TO ADVANCE SAID CARRIER AND SAID PRINT ELEMENT IN A FORWARD ESCAPEMENT DIRECTION BY A DISTANCE CORRESPONDING TO THE WIDTH OF A SELECTED CHARACTER IN RESPONSE TO ACTUATION OF SAID CHARACTER SELECTION APPARATUS; A FOLLOWER ENGAGING SAID LEAD SCREW; MEANS TO REMOVE SAID FOLLOWER FROM ENGAGEMENT WITH SAID LEAD SCREW; MEANS TO ADVANCE SAID CARRIER IN SAID FORWARD ESCAPEMEANS DIRECTION WHEN SAID FOLLOWER IS OUT OF ENGAGEMENT WITH SAID SCREW; A TABULATION ASSEMBLY COMPRISING A TUBULATION RACK EXTENDING IN GENERALLY PARALLEL RELATION WITH SAID LEAD SCREW; A PLURALITY OF SPACED TABULATION STOPS INDIVIDUALLY MOVABLY MOUNTED ON SAID TABULATION RACK; FIRST TYPIST CONTROLLED MEANS FOR MOVING ANY SELECTED TABULATION STOP BETWEEN SET AND CLEAR STATES; A TUBULATIN SENSOR MOUNTED ON SAID CARRIER AND MOVABLE BETWEEN EXTENDED AND RETRACTED POSITIONS; SAID TABULATION SENSOR WHEN IN SAID EXTENDED POSITION NORMALLY ENGAGING ONLY THOSE OF SAID TABULATION STOPS WHICH ARE IN SAID SET STATE UPON ADVANCEMENT OF SAID CARRIER IN SAID FORWARD ESCAPEMENT DIRECTION; SECOND TYPIST CONTROLLED MEANS FOR MOVING SAID TUBULATION RACK; AND STOP MEANS OPERATIVE UPON ACTUATION OF SAID SECOND TYPIST CONTROLLED MEANS TO LIMIT MOVEMENT OF SAID TABULATION RACK TO A POSITION WHERE SAID TABULATION SENSOR ENGAGES ALL OF SAID TABULATION STOPS IRRESPECTIVE OF THE STATES THEREOF WHEN SAID TABULATION SENSOR IS IN SAID EXTENDED POSITION UPON ADVENCEMENT OF SAID CARRIER IN SAID FORWARD ESCAPEMENT DIRECTION.