Patent ID: 7330674

Claim:
An image forming apparatus to perform a printing job using an intermediate transfer belt, the apparatus comprising: a refresh charge determination part for determining a level of a refresh charge corresponding to a potential difference which is generated on opposite surfaces of the intermediate transfer belt; a power supply for supplying the refresh charge to the intermediate transfer belt so that the potential difference is offset; at least one photoconductor; at least one first transfer unit for transferring a toner image developed on the at least one photoconductor to a surface of the intermediate transfer belt; a second transfer unit for transferring the toner image transferred to the surface of the intermediate transfer belt to a paper; a resistance measurement part for measuring a resistance of the intermediate transfer belt; and a transfer signal determination part for determining a magnitude of a transfer signal, which is supplied to the first transfer unit and the second transfer unit to form an electric field for performing a transferring operation, according to the resistance of the intermediate transfer belt.