Inking system with a belt and differential roller speeds

Details Inking system with a belt and differential roller speeds Inking system with a belt and differential roller speeds

B - Operations, Transporting

41

F

B41F 31/16 (2006.01)

Patent

CA 2361338

To minimize the presence of roll-to-roll nips in an inking system for a printing plate cylinder, an ink transfer belt (80) transfers ink from an ink transfer roller (14), which receives ink from a supply (12), to the ink receiving elements on a printing plate cylinder (50). A plurality of guide rolls (84) inside the loop of the ink transfer belt (80) contact the drivable surface of that belt. A drive (414, 104) is connected with one of the guide rollers (84) for driving it to rotate at a first velocity, which is the velocity of the ink transfer roll and of the printing plate cylinder. An ink distribution roller (70) is disposed outside the loop of the belt in contact with the opposite, ink transfer surface of the belt and between the ink transfer roller and the printing plate cylinder.

Afin de minimiser la présence de zones de contact entre rouleaux d'un système d'encrage pour cylindre de plaque d'impression, une courroie de transfert d'encre (80) transfère l'encre d'un rouleau de transfert d'encre (14), qui reçoit l'encre en provenance d'une alimentation (12), aux éléments récepteur d'encre prévus sur le cylindre (50) de plaque d'impression. Plusieurs rouleaux de guidage (84) prévus à l'intérieur de la boucle formée par la courroie de transfert (80) viennent en contact avec la surface pouvant être entraînée de ladite courroie. Un entraînement (414, 104) est relié à un des rouleaux de guidage (84), de sorte qu'il entraîne ce dernier en rotation à une première vitesse, laquelle correspond à la vitesse du rouleau de transfert d'encre et du cylindre de la plaque d'impression. Un rouleau de distribution d'encre (70) est placé à l'extérieur de la boucle de la courroie en contact avec la surface de transfert d'encre opposée de la courroie et entre le rouleau de transfert d'encre et le cylindre de la plaque d'impression.

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