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US 5,592,879 AGranted
Method and apparatus for the contact-free removal of dirt from the cylinders of printing machines
AssigneeBaldwin-Gegenheimer GmbH
InventorFranz Waizmann
Life of this patent
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Abstract
A method and apparatus for the contact-free removal of dirt in the form of residues of ink, fibers and dust on rotating cylinders in a printing machine by means of a laser beam which is directed onto the surface to be cleaned.
Claims22
A method for contact-free removal of dirt, ink, color residues, fibers and dust contained on a rotating surface of a cylinder, drum or roller in a printing machine while the cylinder, drum or roller is rotating, the rotating surface having a surface structure, the method comprising the steps of:
- directing a laser beam onto the rotating surface of the cylinder, drum or roller;
- and
- controlling or adjusting the wavelength, energy density, beam cross section, relative speed, pulse repetition rate and pulse duration of the laser beam applied onto the rotating surface so that the laser beam directed onto the rotating surface removes the dirt from the rotating surface without changing the surface structure of the rotating surface.
Apparatus for contact-free removal of dirt, ink, color residues, fibers and dust comprising:
- a cylinder, drum or roller in a printing machine, the cylinder, drum or roller having a rotating surface, the rotating surface having a surface structure;
- a laser beam source;
- and
- means for directing a laser beam from the laser beam source onto the rotating surface, the laser beam source controlling or adjusting the wavelength, energy density, beam cross section, relative speed, pulse repetition rate and pulse duration of the laser beam directed by said means for directing so that the laser beam shining on the rotating surface removes dirt from the rotating surface without changing the surface structure of the rotating surface.
1 more element
Dependencies are inferred from the claim text.