| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of suppressing both of superposition transfer failure caused by excessive application of pressure to a multi-layer toner image in a superposition transfer process and transfer failure in a secondary transfer nip caused by moisture absorption of recording paper. SOLUTION: The image forming apparatus includes: an intermediate transfer belt 51; a photoreceptor belt 2 forming a primary transfer nip in contact with the surface of the intermediate transfer belt 51; a primary transfer roller 54 to which a primary transfer bias is applied in contact with the back of the intermediate transfer belt 51; a secondary transfer counter roller 63 forming the secondary transfer nip in contact with the surface of the intermediate transfer belt 51; and a secondary transfer roller 52 disposed in contact with the back of the intermediate transfer belt 51. In the image forming apparatus, the distance by which the surfaces of the photoreceptor belt 2 and the primary transfer roller 54 are closest to each other is made greater than the thickness of the intermediate transfer belt 51. While the secondary transfer bias is applied to the secondary transfer roller 52, a superposed toner image on the intermediate transfer belt 51 is retransferred to recording paper P in the secondary transfer nip. COPYRIGHT: (C)2008,JPO&INPIT
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