초록 ▼

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 detecti

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.

대표청구항 ▼

[ What is claimed is:] [1.] A printing press, comprising:a die cut cylinder having a circumference and being adapted to form a cut in a web, said die cut cylinder having a raised cutting edge and a reference mark;a first rotatable printing cylinder adapted to print an image on said web, said first p

[ What is claimed is:] [1.] A printing press, comprising:a die cut cylinder having a circumference and being adapted to form a cut in a web, said die cut cylinder having a raised cutting edge and a reference mark;a first rotatable printing cylinder adapted to print an image on said web, said first printing cylinder being spaced from said die cut cylinder by a first web distance, said first printing cylinder having a circumference substantially the same as said circumference of said die cut cylinder, said first printing cylinder having a printing layer disposed thereon and a cylinder reference mark, said printing layer having a layer a reference mark and being disposed on said first printing cylinder so that said layer reference mark is in a predetermined alignment relative to said cylinder reference mark;a second rotatable printing cylinder adapted to print an image on said web, said second printing cylinder being spaced from said die cut cylinder by a second web distance, said second printing cylinder having a circumference substantially the same as said circumference of said die cut cylinder, said second printing cylinder having a printing layer disposed thereon and a cylinder reference mark, said printing layer disposed on said second printing cylinder having a layer reference mark and being positioned on said second printing cylinder so that said layer reference mark of said printing layer disposed on said second printing cylinder is in a predetermined alignment relative to said cylinder reference mark of said second printing cylinder;a first detector for detecting an angular position of said first printing cylinder by sensing when said reference mark disposed on said first printing cylinder is in a predetermined angular position;a second detector for detecting an angular position of said second printing cylinder by sensing when said reference mark of said second printing cylinder is in a predetermined angular position;a third detector for detecting an angular position of said die cut cylinder by sensing when said reference mark of said die cut cylinder is in a predetermined angular position;means for automatically adjusting said angular position of said first printing cylinder relative to said angular position of said die cut cylinder based on said circumference, said first web distance, and said angular positions of said die cut cylinder and said first printing cylinder; andmeans for automatically adjusting said angular position of said second printing cylinder relative to said angular position of said die cut cylinder based on said circumference, said second web distance, and said angular positions of said die cut cylinder and said second printing cylinder.