Abstract:
An engraving apparatus for producing a printing cylinder with an electron beam, a device for producing the beam and having a vacuum chamber housing, the vacuum chamber housing forming a gap with the cylinder during engraving, the lower part of the housing being removable and has a curvature to fit a predetermined cylinder size to form a gap therewith.
Abstract:
An engraving apparatus for producing a printing matrix such as a printing cylinder including an electron beam producing device having a vacuum chamber opened at its end facing the cylinder and forming a gap with it, the device is adapted to more over the cylinder surface to perform the engraving operation, an end member attached to both ends of the cylinder to assure that the vacuum is not lost by the beam producing device when the engraving is performed at both ends of the cylinder, the end members forming a surface continuity with the cylinder and are removable after the engraving has been performed.