Thermal printing device with an improved image registration, method for printing an image using said printing device and system for printing an image

A printing device comprising:

• a platen for supporting during a printing operation an imaging member having first and second opposed surfaces;
• at least one driving roller for driving said imaging member;
• at least one print head subassembly comprising at least one thermal print head for direct thermal printing on said imaging member, said at least one print head subassembly being configured to be movable independently of said platen for printing on a first surface of said imaging member in a first position in a first transport path of said imaging member and on a second surface of said imaging member in a second position in a second transport path of said imaging member;
• and
• a second roller in contact with said imaging member on the opposite surface to that contacted by said driving roller, said second roller being in a different position for one of said first and second transport paths than it is for the other of said first and second transport paths;
• wherein the distance of transport of said imaging member for a given angular rotation of said driving roller is substantially the same for said first transport path and said second transport path.