MOUTHPIECE FOR COUPLING AN ELECTRON BEAM CANNON TO SURFACES OF PRINTING FORMS

摘要

P a. Mouthpiece for coupling an electron beam cannon to surfaces of printing forms. /P P b. Mouthpiece characterized in that it comprises in the region of its sliding front surface ensuring sealing, at least one other opening, which is positioned in such a manner relative to the opening for the passage of the electron beam ensuring etching, that the already engraved printing elements pass in front of this opening before reaching the opening for passage of the electron beam, this second opening being connected to the vacuum inside the electron gun. /P P c. The invention applies in particular to the engraving of hollow printing cylinders. /P