Offset printing machine has control unit that controls measuring beams striking measuring region of recording material based on thickness of printing, where measuring beam reflective coatings of recording material is covered by printing

摘要

The machine has a conveying unit that conveys recording material (6) through printing elements, and printing units (18-22) that form printing on the surface of recording material. The detector assembly (13) detects the thickness of the printing. The control unit (26) connected with the detector assembly, controls the measuring beams striking the measuring region of the recording material according to the detection result. The recording material comprises measuring beam reflective coatings in the measuring region, where the reflective coating is covered by printing.