| 摘要 |
An image-forming apparatus includes a developing roller (8) and a developing blade (9). The developing blade (9) applies toner to the developing roller (8) to form a thin layer of toner on the developing roller (8). The image-forming apparatus performs a printing operation that includes a paper-feeding period and a developing period following the paper-feeding period. The developing roller rotates relative to the developing blade at a first speed during the paper-feeding period and then at a lower second speed than during the developing period, thereby eliminating chance of white lines of occurring in a printed image. The developing roller (8) may be rotated at a constant speed in each printing operation until the circumferential surface of the developing roller (8) has traveled over a certain cumulative distance. When the surface has traveled over the first distance, the developing roller (8) may be rotated at an increased speed over a certain distance. <IMAGE> |
