Abstract: A multicolor image forming apparatus which includes an image forming drum which has a gap or though in its periphery used for securing the ends of a photoconductive sheet. A transfer roller engages the drum to receive a series of different color toner images in registration to form a multicolor image. The transfer roller is driven by engagement with the periphery of the drum in a pressure nip between the drum and roller. When the gap in the drum passes through the nip, an independent motor rotates the transfer roller to a home position, thereby reindexing the roller between each series of images.