Nexpress Solutions, Inc.

Michael Kowalczyk

Christopher B Liston

Patrick Metzler

John R Thompson

Karlheinz Walter Peter

Heiko Hunold

Robert Michael Peffer

Donald Calvin Buch

Correcting register faults in a multicolor printing machine having a number of items of equipment for the digital production of color separations, wherein correction values are determined and assigned to angular positions of at least one image cylinder and, as a result, taken into account for the control of the production of the color separations on the image cylinder. Correction values are to be made available for the correction of register faults, which, with a fine graduation, make it possible to assign them to angular positions of machine elements in a repeatable way. This is achieved by determining circularity errors of machine elements which have an influence on the register, assigned to their angular positions and, from these, the correction values for the control of the production of the color separations on the at least one image cylinder being determined.

Method and apparatus for correcting register faults in a printing machine

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Rochester, NY, United States of America

Michael Kowalczyk