| 摘要 |
PROBLEM TO BE SOLVED: To print images on both sides of paper by a single paper feeding work by providing a reversing part guiding paper which branches from a paper ejecting part and passes through a printing unit to reverse and return to the entrance side of the printing unit again. SOLUTION: Paper S is advanced through an advancing part 20 provided with a first paper sensor 4 and paper S is supplied to a printing unit 10. Within the printing unit 10, images transferred to a transfer roller 2 from a photosensitive belt 1 are printed on one side of paper S. Next, paper S is engaged with a reversing roller 41 and reverses while the front back face is reversed via a reversing part 40. When a second sensor 5 senses the passing of the rear end part of paper S, the reversing roller 41 revolves in the opposite direction and feeds paper S to the printing unit 10 again. At this stage, back face images are printed on the other side of paper S. Paper S after printing on both the sides is ejected to the outside of a printer main body by rotation of a guide lever 31 of a paper ejecting part 30. |
