Typewriter carriage positioning mechanism

Claim 1

IN A TYPEWRITER HAVING A PLURALITY OF CHARACTER KEYS, A TABULATING KEY, A CARRIAGE RETURN KEY AND A CARRIAGE MOVABLE IN A LETTER-SPACE DIRECTION RELATIVE TO A TYPING POSITIION AND IN A RETURN DIRECTION TO A MARGIN POSITION, SAID CARRIAGE INCLUDING A PLURALITY OF TABULATING STOPS ARRANGED THEREON AND MOVABLE SELECTIVELY TO A STOP POSITION FOR ARRESTING UNINTERRUPTED TRAVEL OF SAID CARRIAGE IN SAID LETTER-SPACE DIRECTION AND AN ADJUSTABLE MARGIN STOP FOR ARRESTING MOVEMENT AND SAID CARRIAGE IN SAID RETURN DIRECTION, DRIVE MEANS ADAPTED TO BE COUPLED TO SAID CARRIAGE FOR MOVING THE LATTER IN SAID LETTER-SPACE DIRECTION, POWER MEANS ADAPTED TO BE COUPLED TO SAID CARRIAGE FOR MOVING THE LATTER IN SAID RETURN DIRECTION, AN ESCAPEMENT MECHANISM INCLUDING A RATCHET AND PAWL AND ACTUATED BY MOVEMENT OF ONE OF SAID CHARACTER KEYS FOR COUPLING SAID DRIVE MEANS TO SAID CARRIAGE AND FOR CONTROLLING THE MOVEMENT OF SAID CARRIAGE IN SAID LETTER-SPACE DIRECTION IN ACCORDANCE WITH THE CHARACTER KEY THAT IS ACTUATED, A TABULATING MECHANISM INCLUDING A STOP MEMBER AND ACTUATED BY MOVEMENT OF SAID TABULATING KEY FOR ENABLING SAID ESCAPEMENT MECHANISM TO COUPLE SAID DRIVE MEANS TO SAID CARRIAGE FOR UNINTERRUPTED MOVEMENT THEREOF IN SAID LETTER-SPACE DIRECTION, AND A CARRIAGE RETURN MECHANISM INCLUDING A RETURN STOP MEMBER AND ACTUATED BY MOVEMENT OF SAID CARRIAGE RETURN KEY FOR COUPLING SAID POWER MEANS TO SAID CARRIAGE FOR MOVEMENT THEREOF IN SAID RETURN DIRECTIION, THE COMBINATION COMPRISING: A DISC PROVIDED WITH EQUIANGULARLY SPACED, PERIPHERAL NOTCHES AND SLIDABLY MOUNTED FOR COAXIAL MOVEMENT INTO COOPERATING RELATIONSHIP WITH SAID RATCHET IN RESPONSE TO ACTUATION OF SAID TABULATING MECHANISM AND OF SAID CARRIAGE RETURN MECHANISM FOR CONTROLLING THE RETURN OF SAID ESCAPEMENT MECHANISM TO AN OPERATIVE CONDITION TO ESTABLISH THE POSITION OF SAID CARRIAGE RELATIVE TO SAID TYPING POSITION, THE LANDS BETWEEN SUCCESSIVE NOTCHES SERVING TO HOLD SAID PAWL OUT OF ENGAGEMENT WITH SAID RATCHET UNTIL MOVEMENT OF SAID CARRIAGE IN EITHER OF SAID LETTER-SPACE DIRECTION OR SAID RETURN DIRECTION HAS BEEN ARRESTED; MEANS MOVABLE IN RESPONSE TO ENGAGEMENT OF SAID STOP MEMBER AND ONE OF SAID TABULATING STOPS IN SAID STOP POSITION WITH UNINTERRUPTED MOVEMENT OF SAID CARRIAGE IN SAID LETTER-SPACE DIRECTION AND OF SAID RETURN STOP MEMBER AND SAID MARGIN STOP WITH MOVEMENT OF SAID CARRIAGE IN A RETURN DIRECTION FOR HOLDING SAID DISC IN COOPERATING RELATIONSHIP WITH SAID RATCHET; AND MEANS RESPONSIVE TO ACTUATION OF THE FIRST CHARACTER KEY AFTER MOVEMENT OF SAID CARRIAGE HAS BEEN ARRESTED FOR RELEASING SAID HOLDING MEANS TO RE-ESTABLISH CONTROL OF THE MOVEMENT OF SAID CARRIAGE BY SAID ESCAPEMENT MECHANISM.