| 摘要 |
An apparatus and method for cleaning a transfer roller of a wet-type image forming apparatus are provided. The method includes applying a measured voltage to the transfer roller; measuring a resistance among a transfer backup roller, an intermediate transfer medium, and the transfer roller based on the applied measured voltage; calculating a density of a toner of a developer on the transfer roller based on the measured resistance; and if the density of the toner is more than or equal to a predetermined reference value, supplying a carrier or applying the cleaning voltage. Thus, the cleaning voltage can be adjusted depending on the density of the toner of the developer on the transfer roller so as to maintain appropriate cleaning efficiency. If the density of the toner is greater than or equal to the predetermined reference value, the carrier can be supplied so as to improve the cleaning efficiency.
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