Device for flexographic printing on a strip of packing material in packaging machines, particularly for blister packs

A device for flexographic printing on a continuous strip of packaging material in a packaging machine, said device comprising:

• a flexographic printing block roll carrying a flexographic printing block in the form of an element of resilient material in plate form having on one of its faces all patterns to be printed and on its opposite face an adhesive for detachable application to said printing block roll;
• an ink tray juxtaposed with said printing block roll;
• at least one ink transfer roller mounted on said tray and rotatable for transferring ink to said printing block roll;
• displacing means for movable supporting said tray relative to said printing block roll for shifting of said tray and said ink transfer roller away from said printing block roll;
• control means responsive to the stopping of said packaging machine for activating said displacing means;
• a pressure roll adapted to hold said strip against said printing block roll when said packaging machine is operating;
• means connected to said control means for relatively spacing said pressure roll from said printing block roll when said packaging machine is inoperative;
• and
• means effective upon interruption of operation of said machine for continuing to drive said printing block roll and said ink transfer roller.