| 摘要 |
PROBLEM TO BE SOLVED: To choose between a one-side printing mode and both sides printing mode with a reversal unit mounted and prevent wasteful copying or erroneous copying of a long strip of paper permitting printing to one side but not permitting printing to both sides in a perfecting printer. SOLUTION: A control section that executes, printing up to a minimum sheet length corresponding to a minimum transportable interval Ls in a mode of printing to one side, and does not execute printing to both sides in a mode of printing to both sides, when the length (actual length H1 of the sheet or sheet length H2 set by a user) is larger than a relay transport route L to a reversal unit 80 (H1>=L or H2>=L), is provided.
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