| 摘要 |
A printing machine (1) includes a printing unit (3) which performs printing while transferring a sheet P at a printing transfer speed, a circulation transfer unit (4) which receives the sheet after simplex printing and transfers the sheet by reversing the sheet upside down, during duplex printing; and a paper refeed unit (2) which refeeds, to the printing unit, the sheet transferred by the circulation transfer unit after simplex printing, wherein the circulation transfer unit includes a reversing unit (42) which receives the sheet at the printing transfer speed, reverses the sheet upside down by switching back the sheet and accelerates the sheet up to a circulation transfer speed which is higher than the printing transfer speed when sheet transfer is restarted after temporal stop in the switching back, and a horizontal transfer unit (43) which transfers the sheet switched back by the reversing unit, at the circulation transfer speed. |
