Stamping machines

Claim 1

IN A MAIL MARKING MACHINE, THE COMBINATION WITH TWO PARALLEL ROTARY PRINTING DRUMS ONE OF WHICH IS A STAMP PRINTING DRUM, CONVEYOR MEANS FOR ADVANCING MAIL MATTER SUCCESSIVELY FROM A STARTING POINT TOWARDS AND PAST SAID DRUMS TO RECEIVE IMPRESSIONS THEREFROM SIMULTANEOUSLY ON DIFFERENT REGIONS OF THE INDIVIDUAL MAIL MATTER, A MOBILE COUNTER CARRYING SAID ONE DRUM AND BODILY REMOVABLE FROM AND REPLACEABLE IN THE MACHINE ADJACENT THE OTHER DRUM, SAID COUNTER BEING OPERATED FROM SAID ONE DRUM ONCE FOR EACH ROTATION THEREOF, A FIRST CONTINUOUSLY FRICTIONALLY DRIVEN SHAFT POSITIONED BETWEEN SAID DRUMS AND HAVING A DRIVING CONNECTION THEREWITH FOR REVOLVING THEM SIMULTANEOUSLY, AND RELEASABLE ARRESTING MEANS FOR ARRESTING SAID FIRST SHAFT AT EACH REVOLUTION THEREOF, OF A TRIP MECHANISM COMPRISING A SECOND CONTINUOUSLY FRICTIONALLY DRIVEN SHAFT POSITIONED BETWEEN SAID STARTING POINT AND SAID DRUMS, A STOP AND A CAM PROJECTING FROM SAID SECOND SHAFT, SAID CAM BEING AXIALLY AND CIRCUMFERENTIALLY SPACED FROM SAID STOP, A BELL CRANK LEVER PIVOTABLE BETWEEN AN OPERATIVE POSITION IN WHICH ONE OF ITS ARMS ENGAGES SAID STOP AND AN INOPERATIVE POSITION IN WHICH SAID ONE ARM RELEASES SAID STOP, RESILIENT MEANS FOR URGING SAID BELL CRANK LEVER TOWARDS SAID OPERATIVE POSITION THEREOF, TRIP MECHANISM INCLUDING A PIVOTALLY MOUNTED TRIP LEVER HAVING ONE OF ITS ENDS POSITIONED AT LEAST ADJACENT SAID STARTING POINT SO AS TO BE ENGAGE-