Reversible-drive offset rotary printing machine

Rotary offset printing machine having a printing system including

• four plate cylinders (7, 8, 9, 10):
• four rubber cylinders (3, 4, 5, 6) and first and second impression cylinders (2, 1), whereby the printing system will have ten cylinders, said cylinders being rotatably supported with the axes of rotation of the rubber cylinders being movable;
• axially movable drive gears (1'-10') positioned in driving engagement with respective cylinders,
• and comprising, in accordance with the invention,
• a main drive train (12, 13, 15);
• a first rotation-reversal gear (18) located in rotation-transmitting position with respect to the main drive train;
• the drive gear (2') on the first impression cylinder (2) having means, selectively, engageable with the main drive train directly, or via said first rotation-reversal gear (18);
• a further drive gear (20) and a second rotation-reversal gear (19), the further drive gear being in driving connection with the first drive gear (2') of the first impression cylinder (2);
• the drive gear (1') on the second impression cylinder (1) having means selectively, engageable with the further drive gear (20) directly, or via said second rotation-reversal gear (19);
• a first drive train (14) having means selectively engageable with the main drive train (12, 13, 15);
• a second drive train (16, 17) having means selectively engageable with the main drive train (12, 13, 15);
• two each rubber cylinders (3, 4;
• 5, 6) of the four rubber cylinders forming, respectively, first and second pairs and having means movably journaled and located in symmetrically coordinate positions with respect to the first and second impression cylinders for selectively circumferential engagement with a respective impression cylinder (1, 2) or, for selective surface engagement of a rubber cylinder of one pair (3, 4) with a coordinate rubber cylinder (5, 6) of the other pair (3-5;
• 4-6) whereby the two engaging rubber cylinders will form rubber blanket--rubber blanket printing systems;
• and wherein
• (a) for rubber-impression cylinder operation, the drive gears (3', 4';
• 5', 6') of the pairs of rubber cylinders are selectively engageable with the drive gears (1', 2') of the impression cylinders, the plate cylinders associated with respective rubber cylinders being in driving engagement with the drive gears of the associated rubber cylinder (FIGS. 3, 4);
• and
• (b) for rubber cylinder--rubber cylinder operation, the first drive train (14) is, selectively, engageable with the drive gear (9') of the plate cylinder (9) associated with one rubber cylinder (5) of the second pair, the drive gear thereof being engageable with the drive gear (3') of one rubber cylinder (3) of the first pair, to form a first extended gear drive train (13-14-9'-5'-3'-7') (FIG. 5), and
• the second drive train (16, 17) is, selectively, engageable with the drive gear (10') of the plate cylinder (10) associated with the other rubber cylinder (6) of the second pair, the drive gear thereof being engageable with the drive gear (4') of the other rubber cylinder (4) of the second pair to form a second extended gear drive branch (15-16-17-10'-6'-4'-8').