| 摘要 |
PROBLEM TO BE SOLVED: To guarantee printing precision in a width direction of a sheet by increasing a pulling amount of the sheet after an image is formed on one surface, so that the sheet sufficiently follows a reference guide surface.SOLUTION: An external diameter of a switch back roller 105-a' is larger than an external diameter of a switch back roller 105-a. A sheet S is conveyed while minutely rotating (turning) in a C' direction on the left lower side. Namely, the sheet S is conveyed obliquely while minutely rotating with respect to a conveyance direction by a reverse roller pair rotating reversely. With this, the sheet S is conveyed in a direction in which the side end of the sheet S approaches a reference guide 301 and a reference guide 710 in the width direction.SELECTED DRAWING: Figure 3 |
