Patent ID: 6823785
Filing Date: 2004-11-30
Classification: B41F,B41P

Abstract:
A printing unit with at least four cylinders comprising:a first cylinder pair including a first forme cylinder and a first transfer cylinder; a second cylinder pair including a second forme cylinder and a second transfer cylinder, at least said first and second transfer cylinders cooperating in a print-on position of the printing unit; and a separate drive motor for each cylinder in each said cylinder pair, said forme cylinder and said transfer cylinder in each said first and second cylinder pair being driven by their own drive motor and not being in connection with other ones of the cylinders during set-up and production operations of the printing unit, each said individually drive transfer cylinder being operable selectively at one of a plurality of transfer cylinder speeds, including a set-up rotation speed for washing said transfer cylinder or for drawing in a web, a production rotational speed, and a zero rotational speed, said transfer cylinder set-up rotational speed, production rotational speed and zero rotational speed each being different from the others, said forme cylinder in each said cylinder pair being operable selectively at one of a plurality of forme cylinder speeds including a set-up rotational speed, a production rotational speed and a zero rotational speed each being different from the others, said forme cylinder and said transfer cylinder in each said cylinder pair each being simultaneously operable at a selected one of said transfer cylinder speeds and said forme cylinder speeds independently.