초록 ▼

To permit easy change-over between double-prime, double-verso (2/2) printing on a substrate web (5) and double-prime, single-verso (2/1) printing, the cylinders are arranged in printing couples so that first and second blanket cylinders (1, 2) are in printing engagement with each other, with the web

To permit easy change-over between double-prime, double-verso (2/2) printing on a substrate web (5) and double-prime, single-verso (2/1) printing, the cylinders are arranged in printing couples so that first and second blanket cylinders (1, 2) are in printing engagement with each other, with the web (5) therebetween and printing couples including blanket cylinders (3, 4) independently of the blanket cylinders (1, 2) are in engagement with each other, with the web therebetween. One (3) of the blanket cylinders of the printing couples is eccentrically shiftable from engagement with the associated blanket cylinder into engagement with another blanket cylinder (2) so that said other blanket cylinder will function as an impression cylinder for one prime image, and as a printing cylinder for the verso image, while, at the same time, another prime image is being applied thereagainst by the shifted blanket cylinder (3). The systems can be multiplied, preferably staggered vertically, with the substrate in form of a web being guided therebetween. The system permits complete disengagement of the printing couple prior to shifting of the shiftable blanket cylinder, and thus avoids smearing of freshly printed subject matter.

대표청구항 ▼

A method of operating an eight-cylinder printing machine to print on a substrate (5), said printing machine having four printing couples, each including a first, second, third and fourth blanket cylinder (1, 2, 3, 4), and a first, second, third and fourth plate cylinder (10, 20, 30, 40) operatively

A method of operating an eight-cylinder printing machine to print on a substrate (5), said printing machine having four printing couples, each including a first, second, third and fourth blanket cylinder (1, 2, 3, 4), and a first, second, third and fourth plate cylinder (10, 20, 30, 40) operatively associated with the respective blanket cylinder, for printing on said substrate, said method comprising, for printing in a first mode, of (a) double-sided prime-and-verso printing (2/2) (a1) guiding said substrate (5) between the first and second blanket cylinders (1, 2) to, each, apply first prime and verso images, and (a2) between the third and fourth blanket cylinders (3, 4) to apply second prime and verso images; and, selectively, in a second mode, of (b) double prime and single verso printing (2/1); (b1) guiding said substrate (5) between the first and second blanket cylinders (1, 2) to apply first prime and verso images. (b2) disengaging the fourth blanket cylinder and said fourth printing couple from engagement with the third blanket cylinder (3); and (b3) engaging the third blanket cylinder (3) with said second blanket cylinder (2) and guiding said substrate (5) between the third and second blanket cylinders to provide for printing a second prime image on said substrate and to operate said second blanket cylinder as an impression cylinder for, respectively, printing by said first and third blanket cylinders.