| 摘要 |
PURPOSE:To prevent the damage of a photoreceptor, by setting a larger diameter for a pair of flanges at both ends of a cylindrical drum having a photoreceptor than the outer diameter of the drum. CONSTITUTION:Both flanges 12 and 13 have a disk shape and a larger diameter than the outer diameter of a photosensitive drum 11 respectively. A rotary shaft 9 protruding outward along the axial line of the drum 11 is provided concentrically to the center part of each of the flanges 12 and 13. At the same time, cylinder parts 14 and 15 which extend in the direction approaching to each other and along the axial line of the drum 11 are formed at the fringe parts of the flanges 12 and 13. The inner circumference surfaces 14a and 15a of the parts 14 and 15 are opposite to the outer circumference surface of the drum 11. The drum 11 is fitted into the parts 14 and 15. For instance, three holes 16 are drilled equidistantly and along the circumference directions of the flanges 12 and 13. The flanges 12 and 13 are tightened by a coupling rod passing through the holes 16 to hold the drum 11. |
