| 摘要 |
A first printing unit for forming a front image on one surface and a second printing unit forming a back image on the other surface are respectively constructed with two stages of printing heads. With respect to the image formed on one surface of a printing medium by the first printing unit, the image formed on the other surface of the printing medium by the second printing unit is formed as a mirror image of bilateral symmetry about an axis in a transporting direction so that the image on the other surface is consistent with the image on one surface.
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