| 摘要 |
An image forming apparatus is provided for using mono-component nonmagnetic toner, the image forming apparatus being capable of forming images with consistent quality without being influenced by variations in toner carry quantity and chargeability. More specifically, bias voltages are applied to a toner feed roller, developing roller and blade through a toner feed bias supply, development bias supply and blade bias supply, respectively. In this regard, the blade bias voltage is increased by a predetermined magnitude after a release of sleep mode of the fixing device until a predetermined number of image recording media have been imaged. Additionally, the blade bias voltage is decreased for a period of time corresponding to the first turn of the developing roller and increased for a period of time corresponding to the second or more turns thereof. In this manner, the blade bias voltage and the toner feed bias voltage are controllably changeable with a life or an increasing number of image formations.
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