Quality Printing--Handling it Right

A digital approach to web guiding is provided by Erhardt + Leimer (Duncan, S.C.). Its DRS digital web-guide systems have a user-friendly digital controller integrated into the unit's pivoting frame. The DRS can be used with either infrared or ultrasonic edge sensors.

To enhance the accuracy, reliability, and versatility of its web guides, Rissier points to advances made by AccuWeb in the area of edge detection. "Just as changes in environmental conditions can affect the control of color, they also can cause guide point drift that will influence print registration," he states. "For these reasons, AccuWeb developed 'dynamically compensated' edge detectors that automatically compensate for changes in temperature, humidity, dust, dirt, air turbulence, passline variations, and other factors."