Abstract:
The object of the invention is to avoid registration problems in a sheet-fed offset rotary press for high-quality colour printing requiring minimum space. For that purpose the rotary press has two form cylinders (33, 34) and two impression cylinders (21, 22) with in each case at least two printing surfaces (36, 37, 38, 39) that cooperate with a printing cylinder (14) that has one printing surface more than a form cylinder (33, 34), and the sheets (97, 98, 99) are removed from the printing cylinder (14) only after printing is completely finished.
Abstract:
The invention relates to a device for aligning sheets (10, 11, 12) transversal to the direction of travel (L) of the sheets in which a holding device (05) that advances a sheet (10, 11, 12) is displaceably mounted for holding the sheet (10, 11, 12) against a side guide (03), and at least two sheets (10, 11, 12) are situated one above the other in an offset manner in the direction of travel (L) of the sheets. An effective holding surface extends in the direction of travel (L) of the sheets and is longer in the longitudinal direction (105) than in the transversal direction (605) to such an extent that a ratio of the length (105) of the effective holding surface in the longitudinal direction to the width (605) of the effective holding surface in the transversal direction is greater than three.
Abstract:
The invention relates to a short inking mechanism for flatbed rotary presses, comprising a roller with a structured lateral surface (e.g. an intaglio printing roller), ink ducts, a doctoring device and a form roller with a rubber elastic envelope. The aim of the invention is to provide a short inking mechanism with a structured roller e.g. an intaglio printing roller or a hatching roller. This is achieved in the following manner: the maculation rings of the roller with the structured envelope surface can be pre-stressed with the maculation ring of the form roller associated therewith, whereby said rings roll onto each other during operation.