| 摘要 |
PURPOSE:To prevent a roller from being bent by the tension of a photosensitive belt without depending on the rigidity of the roller and without making a device large and heavy and cost high. CONSTITUTION:The roller axle-to-axle distance between the roller shaft 27a of a driving roller 27 and the roller shaft 28a of a driven roller 28 is regulated to a length L1 by a unit case 30. On the other hand, the roller axle-to-axle distance is regulated to a length L2 which is shorter than the length L1 on the outside in the roller shaft direction by a side plate 40. Then, the driving roller 27 and the driven roller 28 are bent in a direction C-D opposite to a direction A-B where the roller is bent based on the tension of a photosensitive belt 12, thereby obtaining a straight state by mutually negating the bend of the rollers 27 and 28. |
