Part 2 of 3: Positional Correction on Color Print Rollers in Offset Printing

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Part 2 of 3: Positional Correction on Color Print Rollers in Offset Printing

Introduction

       This is the second of three advanced electronic gearing topics discussed in this series of papers. The first paper covered tension control on a spindle, while the third will cover writing on a moving conveyor system. To view Part 1 click HERE.

Definition

      This topic covers positional corrections of geared color print rollers on a web style, offset printing machine.  Figure 1 shows material being pulled through three printing rollers, each a different color.  The second and third rollers are geared to the first with a 1:1 ratio.  Each roller must be properly aligned so that as the material is pulled through, the printed colors line up.  In a perfect world, this can be calculated knowing the distance in-between rollers and the radius of the rollers.

Figure 1: Web printing diagram