| 摘要 |
PROBLEM TO BE SOLVED: To realize efficient cooling by which a developing device itself is directly cooled without using a fan whose output is large nor causing nonconformity such as toner scattering in a rotary type color developing device. SOLUTION: In the rotary type color developing device 2 in which several developing units are arranged around a rotary shaft and are integrally rotated, a cavity part 12 penetrated in an axial direction is provided at the center part of the developing device, and ventilation is made at the inside of the cavity part, so that the developing device is cooled. |
