Abstract:
There is described a web-fed or sheet-fed printing machine for security papers, in particular banknotes, comprising a machine frame (100) in which is located a main printing group (10, 13, 15, 20, 23, 25), the printing machine further comprising an additional printing group (1, 2, 8; 1, 2', 8; 1 ,2", 8), independent of the main printing group, placed upstream of the main printing group with respect to a direction of displacement of the web or sheets for performing additional printing of the security papers prior to printing by said main printing group. The additional printing group comprises an inking module (1) containing at least one inking device (3), and a printing module (2; 2'; 2") comprising a cylinder arrangement including a plurality of cylinders (4, 5; 4', 5', 6', 7'; 4", 5", 6", 7"), the printing module being interposed between the inking module and the machine frame of the printing machine. The additional printing group is constructed in such a manner that the printing module can be decoupled from the inking module and the machine frame for replacement by another printing module without this requiring removal of said inking module (1) from the printing machine.
Abstract:
There is described a sheet inspection system for a sheet-fed recto-verso printing press of the type comprising two printing cylinders (10, 20) for carrying out simultaneous recto-verso printing of the sheets, said sheet inspection system comprising at least one inspection device (200; 300; 400) for taking an image of one side of the printed sheets. The sheet inspection system comprises first and second transfer cylinders (60, 65) interposed between a first (10) of the two printing cylinders (10, 20) and a chain gripper system (5) of the printing press, printed sheets being transferred successively from the first printing cylinder (10) to the first transfer cylinder (60), to the second transfer cylinder (65), and to the chain gripper system (5). The inspection device (200; 300; 400) comprises a line image sensor (210; 310; 410) for performing line-scanning image acquisition of the one side of the printed sheets, this line image sensor (210; 310; 410) visually acquiring an image of a printed sheet while the printed sheet is being transported on the first or second transfer cylinder (60; 65).
Abstract:
There is described a sheet inspection system for a sheet-fed recto-verso printing press of the type comprising two printing cylinders (10, 20) for carrying out simultaneous recto-verso printing of the sheets, said sheet inspection system comprising at least a first inspection device (100) for taking an image of a first side of the printed sheets. The first inspection device (100) comprises a first line image sensor (110) for performing line-scanning image acquisition of the first side of the printed sheets, and the first inspection device (100) is disposed in such a way that the first line image sensor visually acquires an image of a printed sheet while the said printed sheet is still adhering onto the surface of a first one (10) of the two printing cylinders (10, 20) of the printing press and immediately before the said printed sheet is transferred to a chain gripper system (5) of the printing press. Also described is a printing press equipped with the inspection system.