Appeal No. 1998-0488
Application No. 08/496,234
The invention pertains to a method and apparatus for
determining color misregistration in a multi-color printing
press. More particularly, the invention relates to a printing
press in which three separate printing stations, such as cyan,
magenta and yellow, cooperate to produce process black. A
process black registration mark is formed at a desired
location on a web where an image is to be printed. The
process black registration mark is examined to determine if
the separate printing stations have properly produced the
process black registration mark.
Representative claim 1 is reproduced as follows:
1. A method of determining color
misregistration in a multi-color printing press
having a plurality of printing stations that
each include a plate cylinder and that each
prints a color image on a web with a
predetermined color of ink, wherein the colors
printed by the plurality of printing stations
cooperate to produce process black, said method
comprising the steps of:
identifying an area of the desired image
that is intended to be printed in black;
forming registration images on the plate
cylinders of the printing stations, said
registration images being positioned on the
plate cylinders such that, during subsequent
printing operations, they will produce color
registration marks that cooperate to print a
process black registration mark on the web in
2
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