Mechanical memory device

Claim 1

IN A TOOL MOVING DEVICE OF THE TYPE HAVING A BASIC FRAME MEMBER, A CARRIAGE FOR A WORK HEAD SLIDABLY DISPOSED ON SAID FRAME MEMBER, A PROBE MOVABLY SUPPORTED ON SAID CARRIAGE FOR MOVING OVER A WORK LINE AS SAID CARRIAGE MOVES ALONG SAID FRAME, AND A WORK HEAD SUPPORTED ON SAID CARRIAGE, AN IMPROVEMENT IN MEANS FOR POSITIONING SAID WORKHEAD IN RESPONSE TO MOTION OF SAID PROBE RELATIVE TO SAID CARRIAGE COMPRISING A MASTER CAM HAVING THE SHAPE OF THE PLANNED CONTOUR OF THE WORK LINE SECURED TO SAID FRAME, MEANS TO SUPPORT THE CARRIAGE FOR PROGRESSIVE MOVEMENT ALONG SAID PLANNED CONTOUR, A ROTATING DRUM CARRIED BY SAID CARRIAGE, MEANS ON SAID DRUM CIRCUMFERENTIALLY SPACED THEREON AND AXIALLY SHIFTABLE RELATIVE THERETO COMPRISING A PLURALITY OF PLUNGERS, MEANS FOR LOCKING SAID PLUNGERS AT CERTAIN PORTIONS OF TRAVEL AS SAID DRUM ROTATES, MEANS RESPONSIVE TO MOTION OF SAID PROBE RELATIVE TO SAID CARRIAGE REFLECTING DISPARITY BETWEEN SAID MASTER CAM AND SAID WORK LINE FOR SETTING SAID PLUNGERS AXIALLY RELATIVE TO SAID DRUM, AND MEANS ADJACENT THE DRUM SUPPORTING SAID WORKHEAD RESPONSIVE TO THE POSITIONING OF SAID PLUNGERS TO MOVE THE WORKHEAD IN A PATH RELATED TO THAT FOLLOWED BY THE PROBE A PREDETERMINED DISTANCE BEHIND SAID PROBE.