| 摘要 |
PURPOSE:To reduce cost by devising a roller shaft of a second roller free to move in the axial direction, and curving a middle part symmetrically right and left in the rectangular direction against a flat surface including the roller shaft. CONSTITUTION:A photosensitive belt 11a travels in the arrow A direction on the upper side of first and second rollers 30, 31 by way of driving both of the rollers 30, 31, the photosensitive belt 11a begins to incline in the arrow B direction on the second roller 31 and pushes a flange 31a. Consequently, the second roller 31 moves in the inclining direction of the photosensitive belt 11a following the curve of a roller shaft 36 and the second roller 31 is inclined by an angle thetabetween the first roller 30 and itself, and slippage of a degree of parallelism is caused on the flat surface orthogonal with the flat surface including both of the rollers 30, 31. One point on the photosensitive belt 11a approaching on C point on the second roller 31 soon returns from D point and causes a return while the photosensitive belt 11a rotates once. The photosensitive belt 11a begins to return and makes contact with the flange 31a, and the second roller 31 follows and returns to the middle part of the roller shaft 36. |
