| 摘要 |
PROBLEM TO BE SOLVED: To actuate a flywheel as a cooling fan as well and to form an image without generating irregularities in rotation by providing stepped projecting parts on the flywheel attached to the rotary shaft of an image carrier. SOLUTION: The flywheel 5 for preventing the irregularities in the rotation of a photoreceptor drum is attached to the top end of the rotary shaft of the photoreceptor drum. The projecting parts 6a provided to cause air are formed on the peripheries of single flywheels 5a constituting the flywheel 5. Then, the flywheel 5 is constituted in such a manner that the projecting parts 6a provided on the single flywheels 5a are shifted little by little and the plural single flywheels 5a are overlapped. Therefore, in the projecting parts 6 of the flywheel 5, steps are formed, so that an air flow can be efficiently caused by the steps of the projecting parts 6, in accordance with the rotation of the flywheel 5. |
