| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that as a tension roller moves, a scatter of a toner image is caused on an intermediate transfer belt in constitution such that the vicinity of the tension roller of an intermediate transfer belt is covered with a potential restriction plate. SOLUTION: The image forming apparatus includes an image-carrying belt that is rotated while carrying toner images on an outer circumferential surface thereof; a tensioner applying tension to the image-carrying belt, a position of the tensioner being changed while being in contact with the inner circumferential surface of the image-carrying belt, the tensioner being electrically grounded or a voltage being applied to the tensioner; and an electrode member, a position of the electrode being changed in conjunction with a change of the position of the tensioner so as to maintain a predetermined distance from the image-carrying belt, the electrode member being electrically grounded or a voltage being applied to the electrode member. As the tension roller moves, the potential restriction plate can be moved. COPYRIGHT: (C)2007,JPO&INPIT
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