Image forming apparatus and method of controlling the same

A controlling method of an image forming apparatus, comprising:

• developing an electrostatic latent image of a photoconductive medium using a toner supplied from a developing apparatus fixed around a photoconductive medium, the toner being supplied from a supplying roller to a developing roller of the developing apparatus by a bias voltage difference;
• and
• collecting remainder toner which is not in use during the developing operation and remains in the developing roller on the supplying roller.

A controlling method of an image forming apparatus which comprises a plurality of color developing apparatuses which are fixedly arranged in a moving direction of a photoconductive medium in order of colors, each of the developing apparatuses adhering a toner supplied from a supplying roller to a developing roller to the photoconductive medium, and a voltage supplying apparatus to supply a predetermined bias voltage to the developing roller and the supplying roller of each of the developing apparatuses, the method comprising:

• developing an electrostatic latent image formed on the photoconductive medium with a predetermined color toner, using one of the plurality of developing apparatuses;
• and
• collecting remainder toner which is not in use during a developing operation and remains in the developing roller on the supplying roller.