| 摘要 |
PROBLEM TO BE SOLVED: To improve quality of an image that is formed on a cylindrical body supported from the inside thereof with a supporting member while the supporting member is rotated.SOLUTION: As shown in (A), with the insertion of a holding member 222 into an inside of a can body 10, compressed-air is supplied to a hole part 413 formed on a holding member body 410. Thereby, the compressed-air is also supplied to a through hole 414, a first air vent 422A to a third air vent 422C. In this instance, a first movable member 440 moves toward a direction shown by an arrow 5A in (A). Thereby, a first ring-shaped member 460 is pressed with a projection 412 and the first movable member 440, and an outer peripheral diameter of the first ring-shaped member 460 is increased as shown in (B). Then an outer peripheral surface of the first ring-shaped member 460 comes in contact with an inner peripheral surface of the can body 10. |
