Printing apparatus

Claim 1

IN THE ART OF PRINTING MACHINES OF THE TYPE ADAPTED TO USE PORTABLE PRINTING PLATES, A MACHINE COMPRISING A FRAME, A TRAY MOUNTED ON THE FRAME AT LEAST A PORTION THEREOF FORMING A PLANE WHICH DEFINES A PRINTING BED, MEANS FOR POSITIONING ON THE PRINTING BED PRINTING MEANS TO ENABLE AN IMPRESSION TO BE TRANSFERRED THEREFROM, MEANS FOR POSITIONING ON SAID TRAY THE DOCUMENT TO BE IMPRINTED, MEANS FOR PROVIDING AT LEAST A PAIR OF SPACED GUIDE RAILS ABOVE AND PARALLEL TO THE PLANE OF THE PRINTING BED, A HOUSING, A PAIR OF SHAFTS EXTENDED THROUGH SAID HOUSING, BEARINGS MOUNTED ON THE END OF SAID SHAFTS AND ADAPTED TO BE DIRECTED BY SAID GUIDE RAILS OVER THE PRINTING BED, A PLATEN HEAD ASSEMBLY HAVING A HANDLE, A PAIR OF MEMBERS FIXED TO AND EXTENDING FROM SAID HANDLE, A SHAFT WITH A PLATEN HEAD ASSEMBLY HAVING A HANDLE, A PAIR OF MEMBERS FIXED TO AND EXTENDING FROM SAID HANDLE, A SHAFT WITH A PLATEN ROLLER ROTATABLY MOUNTED ON SAID EXTENSION MEMBERS, A ROD FOR PIVOTALLY MOUNTING SAID PLATEN HEAD ASSEMBLY IN SAID HOUSING, ADJUSTMENT MEANS FOR SETTING THE DISTANCE TO BE DISPLACED BETWEEN THE PLATEN ROLLER AND THE PLANE OF THE PRINTING BED WHEN THE PLATEN ROLLER AND THE PLANE ROCKED INTO ENGAGEMENT WITH THE ADJUSTMENT MEANS, SAID ADJUSTMENT MEANS COMPRISING MEANS MOUNTED IN SWIVELLING FASHION FROM ONE OF THE SHAFTS EXTENDING THROUGH THE HOUSING AND ADAPTED TO ABUT THE EXTENSION MEMBERS CARRYING THE PLATEN ROLLER, SCREW MEANS THREADED THROUGH ONE WALL OF SAID HOUSING ADAPTED TO ABUT SAID SWIVEL MOUNTED MEANS, AND MEANS FOR LOCKING SAID THREADED SCREW.