Exposure drum mask

H - Electricity – 04 – N

Patent

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Details

H04N 1/08 (2006.01) G03F 3/08 (2006.01) G03F 9/00 (2006.01) H04N 1/46 (2006.01)

Patent

CA 2095190

A mask is used for mounting a sensitized sheet, such as a printing plate, onto the surface of an exposure drum. The mask, acting as an intermediary between the exposure drum and the printing plate, is a flexible sheet, with a top and bottom surface, that is mounted about the exposure drum. A groove formed within the top surface of the flexible sheet is used for securing the printing plate by means of a vacuum. A passageway formed within the flexible sheet connects the groove to the bottom surface and receives a vacuum from the exposure drum. Plates of different sizes are mounted to the exposure drum by interchangeable masks of corresponding sizes.

Une cache est utilisée pour monter une feuille sensible, comme une planche d'impression, sur la surface d'un tambour d'exposition. La cache, qui sert d'intermédiaire entre le tambour d'exposition et la planche d'impression, s'avère une feuille souple, présentant une surface supérieure et une surface inférieure, montée près du tambour d'exposition. Une rainure, formée dans la surface supérieure de la feuille souple, sert à fixer la planche d'impression sous vide. Un passage formé à l'intérieur de la feuille souple relie la rainure à la surface inférieure et subit une mise sous vide du tambour d'exposition. Des planches de différentes tailles sont fixées au tambour d'exposition au moyen de caches interchangeables de dimensions correspondantes.

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