PURPOSE: To permit marks according to a print indication code to be printed on sheets by a method in which sheets with a present print indication code are selected from a plate cylinder group arranged around the second cylinder by the detection of the print indication code optically in the former stage of the printing section of a sheet-fed type printer.

CONSTITUTION: A sheet A is stopped by a front registering claw 6, and print indication mark A1 given to the sheet A is detected by a sensor block s2. Then a plate cylinder e4 for example, selected from plate cylinders e1We7 in the printing section (c) by detection signals comes to be brought into contact with the second cylinder c2 for printing. At the same time as the sheet A is stopped by the claw 6, its end is grasped by the claw of the cylinder c1, transferred to the claw of the cylinder c2, and printed by the plate cylinder e4 being selected. The sheet A is then transferred to the claw of the third cylinder c3 and discharged through a discharge conveyer 8 in the discharging section (d) to a paper receiver 9. The setting area of the device can thus be reduced.