Belt, image forming apparatus which employs belt, belt replacing method and belt control program

摘要

An image forming apparatus includes a plurality of image bearing members; image forming means for forming images of different colors on the image bearing members, respectively; a transfer material conveyer belt for carrying a transfer material; a driving roller for transmitting a driving force to the transfer material conveyer belt; wherein the images of different colors formed on the image bearing members are sequentially transferred in an overlying manner onto the transfer material carried on the transfer material conveyer belt; storing means for storing information on thicknesses of the transfer material conveyer belt at different positions in a movement direction thereof; detecting means for detecting a predetermined position of the transfer material conveyer belt; and control means for controlling timing of start of image formation for each of the image bearing members by associated one of the image forming means on the basis of the information stored in the storing means and a result of detection by the detecting means.