Continuous image transfer belt and variable image size...

B - Operations – Transporting – 41 – F

Patent

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Details

B41F 30/06 (2006.01) B41F 13/193 (2006.01) B41F 17/00 (2006.01) B41N 10/04 (2006.01)

Patent

CA 2344938

A continuous image transfer belt (12) which is useable in a variable image size offset press system (10) and which is adapted to permit the press to print a variety of different sized printed matter is provided. The image transfer belt includes at least one base ply (46), at least one layer of a compressible material (44) over the base ply, and a surface ply (40) over the layer of compressible material. Preferably, the belt is continuous. The belt is used in an offset printing system having the capability to print variable-sized images. The system includes a source of ink (16); at least one plate cylinder (P) and at least one blanket cylinder (B). The system is characterized in that a replaceable sleeve (2l) for the plate cylinder is provided with a printing plate (20) which is adapted to receive ink from the ink source. The image transfer belt is positioned to contact the printing plate in a nip formed between the plate and blanket cylinders. An image transfer belt tensioning system (22, 24, 26) is provided to register the image tranfer belt to the blanket cylinder position in the area of desired image transfer; and an image belt cleaning station (30) is adapted to remove residual ink from the surface of the belt.

L'invention porte sur une bande continue de transfert d'images (12), qui s'utilise dans un système d'impression offset d'images de taille variable (10) et permet à la presse d'imprimer une variété de matières imprimées de différentes tailles. Cette bande de transfert d'images inclut au moins un pli de base (46), au moins une couche d'un matériau compressible (44) disposée sur le pli de base, et un pli supérieur (40) placé sur la couche de matériau compressible. De préférence, la bande de transfert est une bande continue. Elle est utilisée dans un système d'impression offset pouvant imprimer des images de taille variable. Le système comprend une source d'encre (16), au moins un cylindre porte-plaque (P) et au moins un cylindre porte-blanchet (B). Le système se caractérise en ce qu'un manchon remplaçable (21) du cylindre porte-plaque est muni d'une planche d'impression (20) adaptée pour recevoir de l'encre de la source d'encre. La bande de transfert d'images est positionnée pour venir au contact de la planche d'impression dans un espacement formé entre le cylindre porte-plaque et le cylindre porte-blanchet. Un système de tension de la bande de transfert d'images (22, 24, 26) est conçu pour aligner la bande de transfert d'images par rapport à la position du cylindre porte-blanchet, dans la zone de transfert de l'image désirée. Un poste de nettoyage de la bande de transfert d'images (30) est adapté pour éliminer l'encre résiduelle de la surface de la bande.

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