| 摘要 |
PROBLEM TO BE SOLVED: To obtain an image with high definition without lateral stripe irregularity etc., by preventing the fluctuation of the rotating speed of rotary driving force transmitted to the developing device from a driving source without making a device large and increasing the cost. SOLUTION: When a Y clutch 110y, a C clutch 110c, and a BK clutch 110BK transmit the rotary driving force from a driving motor to the one developing device selected from a Y developing device 4y, a C developing device 4c, an M developing device 4m, and a BK developing device 4BK while a fly wheel 203 imparts inertia to the rotary driving force between the driving source and the Y clutch 110y, C clutch 110c, and the BK clutch 110BK; the rotary driving force is transmitted in a state where the driving motor is temporarily and repeatedly connected to the two developing devices in the case of switching to the developing device selected next and the switching is performed. |
