Printing machine for producing a security document

A printing machine for producing a security document (02) comprises an impression cylinder (42) guiding a substrate (26) of the security document (02) and a transfer cylinder (43) cooperating with the impression cylinder (42) at a transfer point and printing a print image (27) onto the substrate (26) being provided;

• the substrate (26) of the security document (02) including at least one transparent window (04);
• a micro-optical structure (03) composed of microlenses (11) being arranged on one side of the substrate (26), at least in the region of the relevant transparent window (04);
• the micro-optical structure (03) composed of microlenses (11) being created by an embossing device (47);
• the impression cylinder (42) and the transfer cylinder (43) being arranged so as to cooperate in such a way that the micro-optical structure (03) composed of microlenses (11) is arranged on one side of the substrate (26), at least in the region of the relevant transparent window (04) and the at least one print image (27) is arranged on the other side of the substrate (26), located opposite this micro-optical structure (03), at least in the region of the transparent window (04);
• the relevant print image (27) including a plurality of image elements (28a to 28j) in a punctiform or linear grid;
• these image elements (28a to 28j) of the print image (27) in each case being designed in a hue different from white;
• a printing device applying a layer (39), which has a planar extension and covers the relevant print image (27), at least on a section of the relevant print image (27), on the side thereof facing away from the micro-optical structure (03), being provided;
• and this printing device being arranged downstream from the transfer point, at which the transfer cylinder (43) prints the print image (27) onto the substrate (26) guided by the impression cylinder (42), on the same side of the substrate (26) as the print image (27) created at the transfer point;
• this printing device being designed so as to create the layer (39) to be created by the printing device of a lighter hue than the hue different from white of which the relevant print image (27) is made;
• the printing device arranged downstream from the transfer point, at which the transfer cylinder (43) prints the print image (27) onto the substrate (26) guided by the impression cylinder (42), being designed as at least one ink jet print head (46);
• and this at least one ink jet print head (46) being designed so as to create the layer (39) to be created by the print head of a white ink, characterized in that the impression cylinder (42) comprises the embossing device (47) around the circumference thereof, this embossing device (47) being designed as an embossing device (47) creating the microlenses (11) in a contactless manner by molding, whereby the embossing device (47) is designed so as to produce the microlenses (11) using an injection embossing method;
• this embossing device (47) creating the micro-optical structure (03) composed of microlenses (11) and being arranged so as to create the micro-optical structure (03) composed of microlenses (11) during the rotation of this impression cylinder (42) on the substrate (26) guided by this impression cylinder (42).