In-line printer with manual positionable mechanically interlocked multiple print head assemblies

A method for printing on a substrate material within a plurality of printing bands, wherein the substrate material has a width and wherein the printing bands are distributed in a predetermined manner over the width, said method comprising the steps of:

• (a) registering one edge of the substrate material;
• (b) feeding the substrate material from a feed area into a print area along a feed direction substantially perpendicular to the width;
• (c) providing a plurality of print head assemblies in the print area;
• (d) linking the print head assemblies mechanically in order to simultaneously place the print head assemblies over a distance;
• and
• (e) moving the print head assemblies relative to each other via linking means along a moving direction substantially perpendicular to the feed direction in order to place the print head assemblies over the printing bands.