The printing machine has two interacting blanket cylinders (1,2) which are each inked by several offset plate cylinders (5,12) and between which the paper (P) to be printed on both sides runs through. One of the blanket cylinders (2) is also in contact with a plate cylinder (8) carrying a collect printing plate. This blanket cylinder (9) receives the inks from several appropriately inked selective color inking cylinders (10). Also arranged between the two blanket cylinders (2,9), is a convertible plate cylinder (16) which carries an offset plate and rests against the blanket cylinder (2) and rests against the blanket cylinder (9) inked by the selective color inking cylinders (10). Thus, it is possible to produce on one side of the paper a multicolor pattern which is made by means of different printing processes and in which either the number of colors used in collect printing or the number of colors used in offset printing is selectively increased by one color. |