| 摘要 |
PURPOSE:To provide an excellent image by forming a hollow part, at least, in either of an image forming drum or a transferred drum, and flowing viscous fluid into its inside to make a rotational speed fixed. CONSTITUTION:A hollow part is formed, at least, in either a picture forming drum 10 or a transferred drum 20, and viscous fluid 30 is sealed in the drums 10, 20 so as to flow along the inner walls of the drums. Vibration of the image forming drum 10 or the transferred drum 20 is reduced by the damper effect of fluid resistance. Besides, the viscous fluid 30 moves along the inner wall with the rotation of the drum, so after a part which comes into contact with the inner peripheral surface of the drum is held up by friction with the inner peripheral surface of the drum, it separates from the inner peripheral surface of the drum to flow downwards by the effect of gravity. Namely, the viscous fluid is rotatingly-stirred inside the drum. At this time, fluid friction effects between the inner peripheral surface of the drum and the viscous fluid 30 in a rotational direction to transmit the viscosity resistance of the fluid. It is thus possible to control rotational vibration, and make a rotation a fixed speed without jitters. |
