MACHINE FOR PRINTING FLAT OBJECTS, IN PARTICULAR ENVELOPES, WITH PRINTING DRUM AND THICKNESS COMPENSATING DEVICE

摘要

The invention concerns a machine comprising two feed rollers (3, 14), one of which at least is a power-operated roller, and a rotating printing drum (6) co-operating with a counter-printing power-operated roller (17). The rollers (17, 14) are borne by the ends of a lever consisting of two yokes, pivoting in its middle (11) and articulated thereat by an articulation with adjustable stop; The displacement of said feed roller (14) following the passage of an envelope (24") between the feed rollers (3, 14) causes the lever to pivot thereby bringing about a corresponding displacement of the counter-printing roller (17), if the latter has not already been displaced by at least said corresponding displacement during the passage of a preceding object (23").