The intermediate transfer belt tracking mechanism driven by the photoconductor belt is one of main features of our four cycle color laser printer. This mechanism has an advantage on precise color registration performance because the intermediate transfer belt driving is not influenced by speed difference between the transfer and the photoconductor belt. There are two major points of employing the intermediate transfer belt driven by the photoconductor belt system. (1) A large diameter roller is employed for a nip region with photoconductor belt, and a smaller diameter roller is employed for a second transfer region. The large diameter roller improves driving force and the stability driving because of the wide nip region. The small diameter roller secures the paper peeling margin on the second transfer region. (2) The reinforcement tapes are placed on the edges of the transfer belt. The large diameter roller has flanges that prevent the transfer belt meander. As a result, the highly precise color registration performance is able to achieve.
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