| 摘要 |
PURPOSE:To improve vibration-proofing and impact resistance without increasing load torque imposed on a driving motor by providing a positional deviation preventing mechanism for preventing a developing device shifted to a developing state from getting out of a specified position in the middle of a motive power transmitting means. CONSTITUTION:In a developing actuation state where a developing machine approaches to a photoreceptor, the crank parts 29a and 29b of crank shafts 28a and 28b are stopped at a position by theta deg. before the moving direction (dead point) of the developing machine (a). It is proper to set theta deg. to 5-10 deg.. A state where the crank shafts 28a and 28b are rotated clockwise by 120 deg. from the above state (b) and a state where they are rotated clockwise by 120 deg. further (c) are a separation state, respectively. The positional deviation preventing mechanism is provided in the driving transmitting means. Therefore, even when the developing device gets out of the specified position and the driving transmitting means is idly rotated, the positional deviation preventing mechanism is actuated and the deviation in a position of the developing device is prevented. Especially, the driving transmitting means is prevented from being idly rotated to a reverse rotating side. |
