Voltage Supplying Unit of Developing Device and Image Forming Apparatus Having the Same, and a Method Thereof

摘要

An image forming apparatus (100) includes a plurality of developing devices (131Y, 131M, 133C, 133K), a voltage generating part (140) to generate a developing voltage, first switching parts (153a,153b) to supply the voltage generated in the voltage generating part (140) to a predetermined developing device out of the plurality of developing devices (131Y, 131M, 133C, 133K), a second switching part (151) to selectively supply the developing voltage generated in the voltage generating part (140) to the first switching parts (153a,153b), and a controller (160) to control the first switching parts (153a,153b) and the second switching part (151).