Abstract: A device for inspecting a printer includes a plurality of interface circuits for a plurality of different kinds of printers. Connectors connect each of the interface circuits to a respective printer. A storage arrangement stores test printing data. A control circuit is connected to select one of the interface circuits and to transmit the test printing data from the storage arrangement to the respective printer for controlling the respective printer to print the test printing data.

Abstract: A snap-on drop away register guide for use with a Heidelberg platen in a Heidelberg printing press includes a reciprocating spring biased plunger having transversely mounted thereon, for oscillating movement, a retractable guide plate. A camming arrangement exists between the guide plate and plunger which is operable upon rectilinear movement of the latter to effectuate the oscillating movement of the former between extended and retracted positions. A one-piece, snap-on raiser quickly changes the height of the lower paper margin and is provided with a vertical rib on one of two depending legs which cooperates with an offset on the drop away register guide to prevent improper mounting of the raiser on the drop away guide. An extension side guide for the Heidelberg platen includes an adjustment device for the lock screw thereof which not only permits the side guide to remain on the platen when not in use but also sideways movement relative to the platen.