| 摘要 |
PURPOSE:To make a transfer current optimum even in a toner image formed by different developing devices' or process cartridges and to obtain satisfactory transferability and satisfactory image at all times. CONSTITUTION:An image forming device allows the developing devices 5 of two or more types or the process cartridges 8B and 8R to be attached/detached to/from the main body of the image forming device and to be replaced, and is equipped with a transfer means 2 which abuts on an image carrier 1 at least at the time of image formation. In the image forming device, a means for detecting the types of the developing devices 5 or process cartridges 8B and 8R is provided. When a transfer material does not exist in a transfer place, the transfer means 2 is constant-current controlled at a current value corresponding to the result of the detection. When the transfer material exists in the transfer place, the transfer means is constant-voltage controlled at the voltage value obtained by adding a constant voltage or a voltage corresponding to the result of the detection to the voltage generated at the time of the constant current control. |
