| 摘要 |
PURPOSE:To prevent oil attached on a transfer material after an image is fixed on a front surface from being attached on a photoreceptor drum through a transfer drum when the image is formed on a rear surface as for an image forming device transferring toner images on the plural transfer materials simulatenously carried by the transfer drum. CONSTITUTION:In the case that the toner images of magenta M, cyan C, yellow Y and black Bk are transferred on the continuous odd number-sheets of transfer materials by simultaneously carrying two transfer material by the transfer drum, the transfer of two sheets, two sheets ... one sheet is conventionally executed like a figure (c), that means, the transfer of one sheet is executed last. Therefore, the oil attached on the transfer material at a fixing time is retained at the part of the transfer drum where the transfer material is not carried at the last transfer occasion and attached on the photoreceptor drum 1 and a hand. Then, the transfer of one sheet, two sheets ...two sheets is executed like a figure (a), that means, the transfer of one sheet is executed at first. Thus, the oil on the transfer material is not attached at the part where the transfer material is not carried at first. Since the part where the transfer material is wanted to be carried is not made thereafter until a transfer sheet cleaner is actuated, the oil is not transferred and attached on the drum 1 from the transfer drum. |
