To make the use of a machine effectively with relatively a few waste paper, and manufacture economically a partial plate having the small number of pieces by depicting a second plate in the printing period of using a first plate by a method in the form capable of executing a plurality of printing operations after once depiction by two depiction plates.

The printing mechanism 82, 84 include from cylinders 92, 98 provided with press cylinders 96, 102, rubber cylinders 94, 100, cleaning devices 108, 114, and depicting devices 106, 112, and a focusing system works to make desired cells by a laser beam over the surface of the plates 104, 110 on the form cylinders 92, 98 in rotation. Then, the first and second devices 106, 112 are controlled by the first and second operational modes, and the first printing job performs printing in use of the plate 110 depicted by the mechanism 84, and depiction of the plate 104 by the mechanism 82 relative to the printing job to be conducted subsequently during printing to sheet paper 128 by the mechanism 84. Following the process, the form cylinder 92 is moved to a position in cooperation with the rubber cylinder 94, and the form cylinder 98 is to a depiction position, and then a process of the second printing job is started.