Feed system for passing sheets between printing units has second transfer drum, sheets passing from magazine drum to second printing unit via this in double-sided printing, but via perfecting drum in single-sided printing

摘要

The feed system for passing sheets (22) between printing units in a printer comprises a transfer drum (17), magazine drum (18) and perfecting drum (19). There is a second transfer drum (20) parallel to the turning drum and the sheets pass from the magazine drum to the second printing unit via this in double-sided printing, but via the perfecting drum in single-sided printing.