Printing group cylinder of a web-fed rotary printing machine

B - Operations – Transporting – 41 – F

Patent

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Details

B41F 7/00 (2006.01) B41F 9/00 (2006.01) B41F 13/08 (2006.01) B41F 13/28 (2006.01)

Patent

CA 2148389

A printing group cylinder of a web-fed rotary printing machine is mounted by its journals on opposed side walls of the machine. A sleeve positioned on or about the cylinder may be slipped on or off of the cylinder through an opening in the side wall. During operation, the opening in the side wall is closed by placing a pair of sliding gates in their closed position. When it is desired to change the sleeve, the opening in the side wall is uncovered by displacing the sliding gates. In order to obtain good print quality, the bearing is formed of multiple interengaging rings, of which at least one is eccentrically shaped. The eccentric shape of the ring causes the axis of the printing group cylinder to move into either a print engagement or disengagement setting when the ring is slidably rotated. The eccentric ring is secured against turning when the sliding gates are opened.

La présente invention vise un cylindre de groupe d'impression destiné à une machine d'impression sur rotative à bobines. Les tourillons du cylindre se fixent aux parois opposées de la machine. Une gaine placée sur le cylindre, ou à proximité de celui-ci, peut être glissée sur le cylindre, ou en être retirée, par une ouverture pratiquée dans la paroi latérale. En mode de fonctionnement, ladite ouverture est obturée au moyen d'une paire d'opercules coulissants placés en position fermée. Pour changer la gaine, on déplace les opercules coulissants de manière à découvrir l'ouverture pratiquée dans la paroi latérale. Pour assurer une bonne qualité d'impression, le support est formé de plusieurs anneaux s'enclenchant les uns dans les autres. Au moins un de ces anneaux est de forme excentrique, ce qui permet de changer l'axe du cylindre du groupe d'impression en position d'engagement ou de désengagement lorsque l'anneau est glissé en un mouvement rotatif. L'anneau excentrique ne peut tourner lorsque les opercules coulissants sont ouverts.

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