Phototypesetting apparatus

Claim 1

SIZE CONTROL FOR PHOTOTYPESETTING APPARATUS HAVING A CHARACTER MATRIX MADE UP OF A PLURALITY OF MASTER CHARACTERS OF PREDETERMINED SIZE RELATIVE TO EACH OTHER ACCORDING TO THE STYLING CHARACTERISTIC OF THE PARTICULAR FONT WHICH THEY COMPRISE, A REGISTER INCLUDING MEANS FOR REPRESENTING THEREON A POINT SET CODE WHICH INDICATES THE DESIRED IMAGE SIZE WITH RESPECT TO THE MASTER CHARACTERS ON SAID MATRIX, AND MEANS FOR READING SAID REGISTER; COMPRISING MEANS INCORPORATED IN SAID READING MEANS FOR RECOGNIZING INFORMATION REPRESENTING A DESIRED POINT SET FACTOR, AN OPTICAL SYSTEM INCLUDING AT LEAST TWO LENSES MOVABLE WITH RESPECT TO EACH OTHER AND MOUNTED BETWEEN SAID MATRIX AND AN IMAGE PLANE WHICH IS AT FIXED DISTANCE FROM SAID MATRIX TO FOCUS IMAGES OF PREDETERMINED AND DIFFERENT SIZE FROM SAID MATRIX IN SAID IMAGE PLANE, MEANS INCLUDING PAIRS OF STOPS AT DIFFERENT SPACINGS FOR ADJUSTING THE POSITIONS OF SAID LENSES TO PRODUCE DIFFERENT SIZES OF IMAGES ACCORDING TO PREDETERMINED INCREMENTAL CHANGES IN IMAGE SIZE FROM A COMMON MASTER CHARACTER, CONTROL MEANS CONNECTED TO POSITION SAID LENSES WITH RESPECT TO SAID STOPS, MEANS OPERATED BY SAID CONTROL MEANS INDICATING THE POSITION OF SAID STOPS AT ANY PARTICULAR INSTANT, AND A COMPARATIVE CIRCUIT MEANS CONNECTED TO SAID REGISTER READING MEANS AND TO SAID INDICATING MEANS FOR PRODUCING A STEPPING MOVEMENT OF SAID CONTROL MEANS UNTIL THE SETTING THEREOF CORRESPONDS TO THE POINT SET CODE IN SAID REGISTER MEANS.