The present invention relates to a color copier, color printer, color facsimile apparatus or similar color image forming apparatus.
Conventional color image forming apparatuses include one having a photoconductive belt, latent image forming means for forming latent images each being representative of an image
of particular color on the belt electrostatically, a developing unit for developing each latent image with a developer of corresponding color. and an intermediate transfer belt to which the developed images are transferred from the photoconductive belt one above the other. The resulting composite image formed on the intermediate transfer belt is transferred to and fixed on a paper or similar recording medium to complete a color image. This type of image forming apparatus is disclosed in, for example, Japanese Patent Laid-Open Publication (Kokai) No. 182766/1987. However, the problem with such an apparatus is that drive rollers for driving the photoconductive belt and intermediate transfer belt are often eccentric. The eccentricity of the drive rollers prevent the images of different colors from being brought into accurate register with each other.