Device for measuring the quantity of damp on the printing plate of an offset printing machine

Abstract

Abstract For a device for measuring the thickness of the layer of damp on the printing plate of an offset printing machine during printing with the aid of pulsed luminous flux within tight wavelength ranges, of which the re-emitted radiation is received by photoelectric light receivers (63, 65) and converted to electric pulses which are then analysed in an analyser circuit (11) to determine the layer thickness, a bright intensification lamp (57) serves as light pulse source. The radiation of the bright intensification lamp (57) is re-emitted partially directly and partially from the measurement spot (2a) on the printing plate (2), is passed through monochrome filters (62, 64) to individual light receivers (63, 65), the output signals of which, which vary in size, are then analysed to determine the thickness of the layer of damp. The lamp is a discharge flash lamp (57) or a filament lamp in overvoltage pulse operation. <IMAGE>

Inventors

• 👤 Burkhardt Dr. Wirz
• 👤 Walter Dr. Feulner

Bibliographic Details