| 摘要 |
An image forming apparatus capable of effectively reducing a color displacement among a plurality of tandem image carrying drums includes a transfer belt, first and second image carrying drums, first and second drum gears, a motor gear, and an idle gear. A station pitch between rotation axes of the first and second drum gears is different from a value of a multiplication of a circumference of the first and second image carrying drums by a factor of an arbitrary positive integer. An eccentric amplitude rate between a first eccentric amplitude that a pitch circle of the first drum gear has and a second eccentric amplitude that a pitch circle of the second drum gear has is optionally selected in accordance with factors including the station pitch, design values of the idle gear and the circumference of the first and second image carrying drums.
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