Printing – Multicolor – Rotary machines
Patent
1988-07-27
1990-03-27
Crowder, Clifford D.
Printing
Multicolor
Rotary machines
101375, 101DIG48, 101 92, B41F 518
Patent
active
049110730
ABSTRACT:
A method and apparatus for printing a single image at a time in a flexographic printing environment. The present invention utilizes a flexographic plate cylinder which has been modified by forming a groove in its circumference. The groove extends partially around the circumference of the cylinder, leaving an area approximately equal to the area of a single flexographic plate. A belt having a plurality of flexographic plates mounted thereon is entrained about the printing cylinder coincident with the groove and raised area. The groove prevents transfer of the flexographic image to a film passing between the impression cylinder and printing cylinder. Only when the raised area is adjacent the impression cylinder will an image be transferred from a flexographic plate. In addition, only the plate over the raised area is inked when the flexographic belt passes an anilox inking roller. This prevents the accumulation of ink on plates that are not used for image transfer on a particular rotation of the belt. In the preferred embodiment of the present invention, a printing cylinder is utilized having a circumference equal to the printing repeat dimension of the package being printed. A flexographic belt having a prime number of printing plates (gradients) is entwined about the printing cylinder and an idle roller. The idle roller has a circumference which is a prime number of gradients less than that of the printing roller. In this manner, a different of the flexographic plates is disposed over the raised area of the printing cylinder and thus transferred to the film for each revolution of the printing cylinder.
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