| 摘要 |
<p>A pressure-tight vacuum chamber in an electron beam engraving machine for receiving the printing rolls which are to be engraved, comprising a machine bed lower portion, a pressure-tight vacuum hood placed over the lower part, which is shaped in the form of a barrel-like arch and is placed on a sealing lip which surrounds the lower part on its upper rim, a loading aperture for the printing roll arranged in the upper central region of the hood, extending in the longitudinal direction of the hood, a cover which can be lowered into the loading aperture and forming a seal with the latter, and lifting and transport equipment arranged at the front ends and loading aperture, with which the cover can be lifted from its closed position and can be moved on the outer periphery of the hood in the direction of the periphery, clearing the opening, and can be moved back from the open position across the aperture and lowered into the closed position.</p> |
