Photo copying machines

Claim 1

A PHOTO COPYING MACHINE WHICH COMPRISES A TRANSPARENT CYLINDER HAVING A SMOOTH UNBROKEN CYLINDRICAL OUTER SURFACE AND MOUNTED FOR ROTATION ABOUT ITS LONGITUDINAL AXIS, AN ELONGATED LIGHT SOURCE WITHIN SAID CYLINDER, AT LEAST ONE ENDLESS CONVEYOR BELT ARRANGED TO OVERLIE AND EMBRACE THE OUTER SURFACE OF SAID CYLINDER OVER AN ANGLE WHICH IS GREATER THAN 180* BUT LESS THAN 360* FOR CONVEYING PAPER SHEETS FED BETWEEN SAID BELT AND SAID CYLINDER AROUND A CIRCULAR MOVEMENT PATH ABOUT SAID LIGHT SOURCE, BETWEEN A SHEET ENTRY END AND A SHEET DISCHARGE END OF SAID MOVEMENT PATH, INTERMITTENTLY OPERATIVE SHEET FEED MEANS ADJACENT SAID SHEET ENTRY END OF SAID MOVEMENT PATH, FOR FEEDING PAPER SHEETS ALONG AN INPUT PATH TO ENTER BETWEEN SAID BELT AND SAID CYLINDER AT SAID SHEET ENTRY END OF SAID MOVEMENT PATH, A MASTER SHEET LAY STOP MOVABLE BETWEEN AN OPERATIVE POSITION OBSTRUCTING SAID INPUT PATH AND AN INOPERATIVE POSITION CLEAR OF SAID INPUT PATH, A COPY SHEET LAY STOP MOVABLE BETWEEN AN OPERATIVE POSITION OBSTRUCTING SAID INPUT PATH AT A POSITION FURTHER FROM SAID SHEET ENTRY END THAN SAID MASTER LAY STOP AND AN INOPERATIVE POSITION CLEAR OF SAID INPUT PATH, SELECTIVE LAY STOP CONTROL MEANS FOR RENDERING ONE OR THE OTHER OF SAID LAY STOPS OPERATIVE AND THE OTHER INOPERATIVE AND SHEET FEED CONTROL MEANS FOR RENDERING SAID SHEET FEED MEANS OPERATIVE TO COMMENCE FEEDING MOVEMENT OF SHEETS ABUTTING EITHER OF SAID LAY STOPS AT A PREDETERMINED ANGULAR POSITION OF SAID CYLINDER DURING EACH REVOLUTION THEREOF WHEREBY THE LEADING EDGE OF A MASTER SHEET FED BETWEEN SAID CYLINDER AND SAID BELT DURING ONE REVOLUTION OF SAID CYLINDER WITH SAID MASTER LAY STOP IN OPERATIVE POSITION IS POSITIONED IN ADVANCE OF THE LEADING EDGE OF A COPY SHEET ALSO FED BETWEEN SAID CYLINDER AND SAID BELT DURING A SUBSEQUENT REVOLUTION OF SAID CYLINDER WITH SAID COPY SHEET LAY STOP IN OPERATIVE POSITION.