Patent ID: 6591746
Filing Date: 2003-07-15
Classification: B41F,B41P

Abstract:
A printing press, comprising:a first rotatable printing roller that prints ink of a first color on a web of material, said first printing roller causing a first pair of registration marks to be periodically printed in said first color on said web; a second rotatable printing roller that prints ink of a second color on said web of material, said second printing roller causing a second pair of registration marks to be periodically printed in said second color on said web; a third rotatable printing roller that prints ink of a third color on said web of material, said third printing roller causing a third pair of registration marks to be periodically printed in said third color on said web; an imaging device positioned to detect said registration marks printed on said web by said printing rollers, said imaging device generating image data representing said registration marks; and a controller operatively coupled to said printing rollers and said imaging device, said controller comprising a processor and a memory, said controller being programmed to identify said pairs of registration marks based on said image data and based on registration mark reference data for at least three registration mark pairs defined by a registration mark relationship table set forth below: PairOffset XOffset YColor A08Color B80Color C12âˆ’6Color D126Color E6âˆ’12Color F612Color G20âˆ’4Color H204Color I4âˆ’20Color J420wherein said Offset X value for each of said registration mark pairs corresponds to an offset value in a first direction between said registration marks in said registration mark pair, and wherein said Offset Y value for each of said registration mark pairs corresponds to an offset value in a second direction between said registration marks in said registration mark pair, said second direction being perpendicular to said first direction.