| 摘要 |
PROBLEM TO BE SOLVED: To prevent toner from being transferred and attached to a second toner-carrying means in the case of unnecessary. SOLUTION: A developing device is provided with a developing roller 14 which holds the one-component toner on it, and an intermediate roller 17 which abuts on the developing roller 14 and a photoreceptor 1 for holding an electrostatic latent image on it and which forms a toner image by transferring and attaching the toner from the developing roller 14 to itself, thereby attaching the toner to the electrostatic latent image on the photoreceptor 1. At the time of recording-sheet-area-outside-development between the recording sheets, when the plurality of sheets are consecutively inserted, a bias which is applied to the developing roller 14 is changed and, thus, an electric field direction between the developing roller 14 and intermediate roller 17 is made different from that used at the time of recording-sheet-area-development. |
