Patent ID: 7555985
Filing Date: 2009-07-07
Classification: B41F,B41L,B41P

Abstract:
1. A process for pre-registration in a printing machine with multiple printing units, in which phases of printing cylinders involved in the printing process are mutually attuned such that deviations of printing images of the various printing cylinders lie within a mutual capture area of a measuring system which is used in context of the registration during an ongoing printing operation respectively for determining the printing images or parts of the printing images, the process comprising: feeding a web to be printed to the printing machine in the pre-registration, the web having at least one mark which passes various printing units during the pre-registration; recording time points at which the marks pass measuring points in the printing units, the time points being set with reference to an angular position of the printing images of the respective printing units at the time points; based thereon, adjusting at least one of drives of the printing cylinders and a web path between the printing units such that the deviations of the printing images of the different printing cylinders lie mutually within the capture area of the measuring system, and are used in a context of the registration during an ongoing printing operation respectively for the step of determining the printing images or the parts of the printing images, the time points being recorded at a point at which the print mark passes the roller clearance, and the mark being embossed, compared to the printing material, on at least one surface of the web; and recording an action of a force, which is applied during the passage of the mark through the roller clearance, on the printing cylinders or a counter-support therefor, or a change in a position or an acceleration of at least one of the print cylinders and the counter-supports therefor, or derived mechanical parameters associated therewith.