Photosensitive self-monitoring drawing plotter using light conducting fibers

Claim 1

A DRAWING PLOTTER COMPRISING: A FRAME FOR SUPPORTING THE PLOTTER INCLUDING MEANS DEFINING A SUPPORT SURFACE FOR SUPPORTING INSCRIBABLE MEANS ON WHICH LINES CAN BE DRAWN AND FROM WHICH LIGHT CAN BE REFLECTED, A PLOTTER HEAD APPARATUS INCLUDING A SCRIBER AND A SCANNING HEAD COOPERATING WITH SAID SURFACE, SAID SCANNING HEAD COMPRISING OPTICAL FIBERS WITH THEIR ENDS IN AN ARRAY AND POSITIONED TO PICK UP LIGHT REFLECTED FROM SAID INSCRIBABLE MEANS, PLOTTER HEAD DRIVE MEANS FOR PRODUCING MOVEMENT OF SAID PLOTTER HEAD APPARATUS IN A PREDETERMINED MANNER TO DRAW LINES ON SAID INSCRIBABLE MEANS IN ACCORDANCE WITH SAID MOVEMENT AND TO MOVE SAID PLOTTER HEAD APPARATUS FOR PICKING UP LIGHT REFLECTED FROM SAID INSCRIBABLE MEANS OVER THE AREA OF SAID MOVEMENT, PHOTOSENSITIVE DEVICES ASSOCIATED WITH AT LEAST SOME OF SAID OPTICAL FIBERS, CIRCUIT MEANS COUPLED TO SAID PHOTOSENSITIVE DEVICES FOR PROVIDING OUTPUTS INDICATIVE OF THE RESPONSE OF SAID PHOTOSENSITIVE DEVICES TO LIGHT PICKED UP BY INDIVIDUAL OPTICAL FIBERS ASSOCIATED THEREWITH, AND CONTROL CIRCUIT MEANS FOR COUPLING SAID OUTPUTS OF SAID CIRCUIT MEANS TO SAID DRIVE MEANS TO CAUSE SAID DRIVE MEANS TO MOVE SAID PLOTTER HEAD APPARATUS IN SAID PREDETERMINED MANNER.