| 摘要 |
An apparatus for forming a color image using electrophotography includes a photosensitive drum on which a predetermined electrostatic latent image is formed, a plurality of developing units including a developing roller supplying toner to a surface of the photosensitive drum to develop the electrostatic latent image, and pressure cams sequentially or selectively pressing corresponding ones of the developing units toward the photosensitive drum when the electrostatic latent image is developed. A bracket slide disposed in the apparatus uses tension springs to generate the same normal force in a predetermined range regardless of relative positions of the developing units, and the same normal force are applied to the photosensitive drum from the respective developing rollers while reducing a shock occurring when the developing roller contacts the photosensitive drum. Jitter and bending of an image can be removed or minimized, and the deterioration of a image quality due to a pressure difference can be prevented. In addition, the scattering of toner occurring when the developing roller contacts and/or is separated from the photosensitive drum can be minimized.
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