Printing apparatus for continuous rotary printing, in particular suitable for high speed and intermittent printing

In a rotary typographic printing apparatus, for a strip of printable material having

• a printing roller (2) holding a printing plate (3) and having a printing roller axis;
• a pressure roller (4) pressing said strip against said printing roller;
• a screened roller (5) in contact with said printing roller and dampening said printing roller;
• and
• an ink roller (6) partially dipped in an ink well (7) and dampening said screened roller;
• an improvement for allowing high-speed and intermittent combination printing of both changeable data and fixed images, the improvement comprising:
• means for intermittent disengagement of said printing roller from said pressure roller and from said screened roller at the completion of a printing phase,
• said means for intermittent disengagement further comprising:
• a first support (20) to which said printing roller is rotatingly connected for rotation of said printing roller about said printing roller axis;
• a fixed pivot (21) about which said first support intermittently rotates, said fixed pivot being eccentric with respect to said printing roller axis (23);
• an actuator (22) of rotation around said fixed pivot, said actuator being connected to said first support to rotate said first support;
• a mobile second support (30) on which said ink roller is rotatingly connected, said second support being movable on fixed guides (33) such that a space (8) between said ink roller and said screened roller can be varied, whereby the screened roller can be dampened with ink to a greater degree in case of long breaks in printing, and said second support and said fixed guides together constitute a means for preventing drying of an ink film;
• and
• means (15) for washing said printing roller in the case of long breaks.