| 摘要 |
PURPOSE:To prevent the eccentricity of a photosensitive drum with respect to a driving shaft by interposing an elastic body positioning the photosensitive drum in the thrust direction between a positioning means, which is fitted to a drum driving shaft and is positioned in the thrust direction, and the photosenditive drum. CONSTITUTION:To position for photosensitive drum 6 in the thrust direction (s), the elastic body 8 interposed between the flange part 61 of the photosensitive drum 6 and an object 9 which is fitted to the drum shaft and is positioned in the thrust direction is pushed. In this case, a V-shaped groove 61a and a driving pin 7a are free in the thrust direction (s), whereas in the rotating direc tion (r) they are connected when the drum driving shaft 7 is driven. However, they have a clearance with some range. Consequently, even if the groove 61a and/or the driving pin 7a is out-of-center, an unnecessary stress does not arise between the driving pin 7a and the groove 61a. Thus, the eccentricity of the photosensitive drum with respect to the driving shaft can surely be prevented. |
