| 摘要 |
In an image forming apparatus that has a photosensitive belt and developing rollers for developing images by bringing the photosensitive belt in contact with the developing rollers when developing images, supporting members are provided for supporting the photosensitive belt in the state it is oscillated according to the contacting force of the photosensitive belt with the developing rollers. Thus, a large pressure applied to the nip portion between the photosensitive belt and the developing rollers is prevented and further, the tensile force applied to the photosensitive belt is prevented from largely fluctuating when the developing rollers contact the photosensitive belt by intruding into it.
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