Selective condition limiting recording system for a motor controlled machine tool

Claim 1

APPARATUS FOR CONTROLLING THE POSITION OF A MOVABLE ELEMENT COMPRISING MOTIVE MEANS MOVING SAID ELEMENT WITHIN A PREDETERMINED RANGE OF POSITIONS, MANUAL MEANS FOR MANIPULATING SAID ELEMENT TO ANY DESIRED POSITION WITHIN SAID RANGE, SIGNAL MEANS INTERCONNECTING SAID MOTIVE MEANS AND SAID MANUAL MEANS AND GENERATING SIGNALS RELATED IN MAGNITUDE AND POLARITY TO THE DEGREE OF MANIPULATION OF SAID MANUAL MEANS UP TO A MAXIMUM MAGNITUDE, SAID MOTIVE MEANS BEING RESPONSIVE TO THE MAGNITUDE AND POLARITY OF SAID SIGNALS AND OPERATIVE IN RESPONSE THERETO, HOMING MEANS ADAPTED TO GENERATE A VARIABLE PATTERN OF SIGNALS UNIQUELY DEFINING SAID RANGE OF POSITIONS AND AN ADJUSTABLE HOME POSITION FOR SAID ELEMENT, LIMIT MEANS ADJUSTABLE WITHIN SAID RANGE OF POSITIONS TO ANY PREDETERMINED POSITION AND ADAPTED TO GENERATE A LIMIT SIGNAL WHEN SAID ELEMENT IS AT SAID PREDETERMINED POSITION WHICH EFFECTIVELY ISOLATES SAID SIGNAL MEANS FROM SAID MOTIVE MANS WHEREBY SAID MOTIVE MEANS CANNOT MOVE SAID ELEMENT THROUGH SAID PREDETERMINED POSITION, AND MEANS SELECTIVELY CONNECTING SAID HOMING MEANS, SAID SIGNAL MEANS, OR SAID SIGNAL MEANS AND LIMIT MEANS TO SAID MOTIVE MEANS.