Printing machine for printing a laminar web

Printing machine for printing a laminar web, the printing machine comprising:

• rollers defining a web path for guiding a web, the rollers comprising first and second supporting rollers defining therebetween a printing area of the web path,
• a pulling device being adapted to maintain a constant tension in the web guided through the printing area;
• an inkjet printing station comprising a plurality of inkjet printing modules with inkjet print heads facing the printing area of the web path for printing thereon, the inkjet printing modules being slidably arranged along a transverse guide transverse to the web path, each inkjet printing module being adapted for printing a fraction of the width of the printing area with digitally modifiable items;
• a positioning device adapted to precisely slide the inkjet printing modules along the transverse guide in the direction transversal to the web path;
• and
• each inkjet printing module includes a first coupling and is independent from other inkjet printing modules allowing an independent movement of each inkjet printing module along the transverse guide, the positioning device including a second coupling complementary to each first coupling, the second coupling being releasably engageable to each first coupling in an automatic manner by an engagement driver, the positioning device being configured to precisely slide each inkjet printing module engaged thereto, through the engaged first and second couplings, along the transverse guide.