As the web material is pulled from the roll, the extension arm, which pivots on a stainless steel shaft, allows the coder to ride on the surface of the master roll and print on the web material as it is being unwound. The coder remains in contact with the surface of the master roll, following the diminishing diameter of the roll down to the core. This system was designed to print codes on continuous web materials that are too narrow to engage the friction drive bearers on our standard Non-Porous Coders. A floor mounted stand includes a height adjustable idler roll assembly which guides the web through the coder. A friction driven offset roll mounted upstream of the print drum keeps the print drum rotating at the same surface foot velocity as the web.
Printing die contact pressure is fully adjustable on the fly for optimal print quality.