Dual-color copier

An imaging apparatus comprising:

• an original holder for holding thereon an original;
• first image forming means including a first photoconductive layer having sensitivity to light of a first selected color and second photoconductive layer having sensitivity to light of a second selected color which is different from said first selected color, said first imaging forming means including a first drum having a first peripheral surface on which said first and second photoconductive layers are formed overlying one on top of the other;
• second image forming means including a third photoconductive layer having sensitivity at least to light of a first selected color, said second image forming means including a second drum having a second peripheral surface on which said third photoconductive layer is formed;
• a first optical system for leading a light image from said original to said first imaging forming means thereby forming a first electrostatic latent image on said first image forming means;
• a second optical system for leading said light image from said original to said second image forming means thereby forming a second electrostatic latent image on said second image forming means;
• first developing means for developing said first latent image by applying toner of said first selected color;
• second developing means for developing said first latent image by applying toner of said second selected color;
• transporting means for transporting a transfer medium along a predetermined path along which said first and second image forming means are disposed;
• first transferring means for transferring a toner image formed by said first developing means to said transfer medium;
• and
• second transferring means for transferring a toner image formed by said second developing means to said transfer medium;
• and
• such that said transporting means includes a transfer belt which is in rolling contact with said first drum but not in rolling contact with said second drum.