| 摘要 |
PROBLEM TO BE SOLVED: To form a color image of high quality by making circumferential speed of a developing roll faster than the circumferential speed of an image carrier while carrying out positioning of the image carrier and the developing roll at high precision. SOLUTION: In the device, positioning parts 12 that share a same shaft as the image carrier but with a different diameter are provided on both end parts of the image carrier 10, rollers 22 that are abutted to the positioning parts 12, sharing the same shaft as a developing roll 20 but with a different diameter are provided on both end parts of the developing roll 20, the diameters Rf and Rk of the part 12 and the roller 22 are set so that the circumferential speeds Vf and Vk of the both coincide with each other a contact part T2 of the part 12 and the roller 22. |
