Multi-color printing system

Claim 1

IN A MULTI-COLOR PRINTING APPARATUS, A SUPPORTING FRAME, AN IMPRESSION CYLINDER ROTATABLY MOUNTED IN SAID FRAME FOR ROTATION ABOUT A PREDETERMINED AXIS, MEANS FOR ROTATING SAID CYLINDER; SHEET GRIPPERS ON SAID IMPRESSION CYLINDER FOR SEIZING A SHEET, HOLDING IT FOR A COMPLETE CYCLE OF MULTIPLE ROTATIONS, AND RELEASING IT AT THE END OF SUCH CYCLE; A COLLAR MEMBER SLEEVED ONTO A PORTION OF SAID IMPRESSION CYLINDER ADJACENT ONE END THEREOF, A TRIPPING CAM ON SAID COLLAR MEMBER ADAPTED TO CONTACT AND ACTUATE THE IMPRESSION CYLINDER GRIPPERS WHENEVER THE TRIPPING CAM AND SAID GRIPPERS COINCIDE IN THEIR ANGULAR MOVEMENT ABOUT THE AXIS OF SAID IMPRESSION CYLINDER; A ROTARY TRANSMISSION MEMBER MOUNTED IN THE FRAME ADJACENT SAID IMPRESSION CYLINDER AND CARRYING A FIRST GEAR AND A SECOND GEAR COAXIAL THEREWITH, A GEAR FIXED TO SAID IMPRESSION CYLINDER AND COAXIAL WITH IT AND MESHING WITH SAID FIRST GEAR OF THE ROTARY MEMBER, THE DIAMETER OF SAID FIRST GEAR BEING AN EVEN MULTIPLE OF THAT OF THE SAID IMPRESSION CYLINDER GEAR; A GEAR CARRIED BY AND COAXIAL WITH SAID COLLAR MEMBER AND MESHING WITH SAID SECOND GEAR OF THE ROTARY MEMBER, THE RATIO OF SAID SECOND GEAR TO THE COLLAR-CARRYING GEAR BEING NUMERICALLY EQUAL TO THE RATIO OF SAID FIRST GEAR TO THE IMPRESSION CYLINDER CARRYING GEAR DIMINISHED BY ONE, WHEREBY THE IMPRESSION CYLINDER GRIPPER ACTUATING CAM ON THE COLLAR MEMBER COINCIDES WITH THE IMPRESSION CYLINDER GRIPPERS FOR TRIPPING THE LATTER ONLY ONCE FOR EACH CYCLE OF MULTIPLE COLOR PRINTING ROTATIONS OF THE IMPRESSION CYLINDER.