Pre-registration system for a printing press

Details Pre-registration system for a printing press Pre-registration system for a printing press

1996-10-10

1998-06-30

Eickholt, Eugene H.

Printing

Processes

Position or alignment

101181, 101248, B41F 1324

Patent

active

057718113

ABSTRACT:
A pre-registration system for a printing press may be provided with a first detector for detecting an angular position of a first rotatable printing cylinder by sensing when a reference mark disposed on the first printing cylinder is in a predetermined angular position, a second detector for detecting an angular position of a second printing cylinder by sensing when a reference mark of the second printing cylinder is in a predetermined angular position, and an adjustment mechanism for automatically adjusting the angular position of one of the printing cylinders based on the circumference, a web distance, and the angular position of one of the printing cylinders. The adjustment mechanism may adjust the angular position based upon a stored phase data relating to the web distance and the circumference. Alternatively, the adjustment mechanism may determine a target angular position for the one printing cylinder, determine a phase correction signal based upon the angular position of the one printing cylinder and the target angular position, and adjust the angular position of the printing cylinder based upon the phase correction signal.

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