Patent ID: 6971308

Claim:
Printing device for printing machines of various kind, and particularly but not exclusively offset printing machines, adapted to print also with colors paper pages and sheets of any size, wherein the printing machines comprise a plurality of cylinders of the same length, supported on a rigid supporting structure and driven in rotation by means of transmission means, said cylinders including one or more caoutchouc-covered printing cylinders co-operating with cylinder-plates of conventional type, on to which the printing plates are applied, and with possible applying means for the ink and the printing aqueous solution, the device being characterized in that said printing cylinders ( 10 , 11 ) and said cylinder-plates ( 16 , 17 ) are made with at least a double height and that there are provided magnetic means ( 23 ) associated with said printing cylinders ( 10 , 11 ) and said cylinderplates ( 16 , 17 ), said magnetic means ( 23 ) being adapted to be magnetized during the printing process, so as to keep a reciprocal attraction among said printing cylinders ( 10 , 11 ) and said cylinder-plates ( 16 , 17 ) for the entire printing process duration, and adapted to be de-magnetized at the end of the printing process, said magnetic means ( 23 ) being made in such a way as to permit them to be magnetized and de-magnetized at pre-established intervals by means of electric control means connected thereto.