Abstract: A sheet accumulator for advancing successive sheets between first and second color printing presses comprising an accumulator sheet conveyor for advancing sheets from one press to the other press, a sheet lifter at the conveyor to lift a first sheet and thereby enable the sheet conveyor to advance a second sheet beneath the first sheet, and a sheet sensor at the conveyor, operably associated with the sheet lifter to actuate and deactuate the sheet lifter based on the position of the sheet.

Abstract: A printing press electronic side guide registry apparatus for sheet stock to be printed on a printing press having a print cylinder, print stock forward motion advancer through the print cylinder, and a forward motion registry stop including a laterally movable side registry stock gripper device comprising a slide anvil positioned to be adjacent one surface of the stock, and a fluid cylinder positioned to be adjacent the opposite surface of the stock, aligned with the slide anvil to grip sheet stock therebetween, the slide anvil and fluid cylinder both mounted on a laterally shiftable support movable transverse to sheet stock forward motion, a nut connected to the support, and a laterally extending screw operably engaging the nut, a rotational servo motor drivingly connected with the screw for rotation of the screw to laterally drive the nut, support, fluid cylinder and slide anvil, and a sheet edge detector electrically associated with the servo motor to controllably actuate and deactuate the servo motor, wh