초록 ▼

Photoreceptor drums for forming color images each have a gear as the drive transmission element at their central shafts. Each gear has an idle gear which in turn is coupled with a first motor via a timing belt. The photoreceptor drum for forming black monochrome images has a gear as the drive transm

Photoreceptor drums for forming color images each have a gear as the drive transmission element at their central shafts. Each gear has an idle gear which in turn is coupled with a first motor via a timing belt. The photoreceptor drum for forming black monochrome images has a gear as the drive transmission element at its central shaft. This gear has an idle gear which is coupled with a second motor.

대표청구항 ▼

[ What is claimed is:] [1.] An image forming apparatus comprising:a plurality of image supports, said plurality of image supports including a first set of image supports adapted to have color separated images formed thereon and a second image support adapted to have a black monochrome image formed t

[ What is claimed is:] [1.] An image forming apparatus comprising:a plurality of image supports, said plurality of image supports including a first set of image supports adapted to have color separated images formed thereon and a second image support adapted to have a black monochrome image formed thereon;latent image forming means for forming a latent image on each of said image supports;developing means for visualizing the latent images formed on said image supports;transfer means for successively transferring the visualized images formed on said image supports onto a recording medium to form an image thereon;conveying means for conveying said recording medium to said transfer means;driving means for driving said conveying means and rotationally driving said second image support, and, when a full color image is desired, for selectively rotationally driving the image supports of said first set of image supports, said driving means comprising a first independent drive device for rotationally driving said second image support and said conveying means, and a second independent drive device for rotationally driving each of the image supports of said first set of image supports; anddischarging means for discharging said recording medium with an image transferred thereon.