| 摘要 |
When printing is effected on an obverse surface C1 of a copying paper sheet C, a scan position of a laser beam B on a photosensitive drum 20 is shifted by a first set amount in an axial direction of the photosensitive drum relative to a predetermined reference position. The first set amount corresponds to a positional displacement amount L1 of the copying paper sheet C, which occurs when the copying paper sheet C is first fed to the photosensitive drum 20. In addition, when printing is effected on a reverse, surface C2 of a copying paper sheet C, a scan position of the laser beam B on the photosensitive drum 20 is shifted by a second set amount in the axial direction of the photosensitive drum relative to a predetermined reference position. The second set amount corresponds to a positional displacement amount L2 of the copying paper sheet C, which occurs when the copying paper sheet C, the printing on the obverse surface of which has been finished, is fed once again to the photosensitive drum 20.
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