| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of transfer defect owing to the environmental change, at the time of collectively performing transfer on both side of recording material, in the case of forming images on both side by the once time transportation of recording material. SOLUTION: This image forming device is, let arranging the fixing device 9 provided with a fixing roller 51 and the pressure roller 52 holding a transporting belt 130 there between, in between the image forming part Pd on the supreme downstream side and the driving roller 45 driving the transporting belt 130. The image forming device is, let transferring the toner image by directly laying the same on the transporting belt 130, further transferring it on the B side (rear side), transferring the toner image on the A side in overlapping at the same time, and letting the recording material separated from the transporting belt 130, after fixing both sides by the fixing device 9. In the processing stage simultaneously performing transfer on the A side and the B side, bias of the optimum condition is applied on the A side.
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