| 摘要 |
A double-sided printing apparatus includes: a first printing control unit which receives printing data including page-number information per slip so as to print a slip on the obverse of a sheet by selecting printing data for printing on the obverse; and a second printing control unit which receives size information of the slip to be printed on the obverse as well as printing data for printing on the reverse of the sheet. The second printing control reads a mark printed on the obverse by using a mark reading sensor at a timing according to the size information, and compares page-number information obtained by reading the mark with that included in the printing data for printing on the reverse, so as to print, on the reverse of one page of the sheet, a slip having the page-number following that of the slip printed on the obverse of the same page.
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