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US 2003/0118377 A1Published application
Image forming apparatus
AssigneeToshiba Tec Kabushiki Kaisha
InventorKouji Hirano
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AssigneeToshiba Tec Kabushiki Kaisha
InventorKouji Hirano
Estimating the term…
An image forming apparatus of the type using mono-component nonmagnetic toner is disclosed, which is capable of forming images with consistent quality without being influenced by variations in toner carry quantity and chargeability with a life. Bias voltages are applied to a toner feed roller 6, developing roller 5 and blade 8 through a toner feed bias supply 18, development bias supply 16 and blade bias supply 11, respectively, and the mono-component nonmagnetic toner T is carried to a photosensitive drum so that image formation is accomplished by electrophotography. With respect to the blade 8, 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 formations has been made. Furthermore, the blade bias voltage is decreased for a period of time corresponding to the first turn of the developing roller 5 and increased for a period of time corresponding to the second or more turns thereof. The blade bias voltage and the toner feed bias voltage are controllably changeable with a life or an increasing number of image formations.
An image forming apparatus comprising:
An image forming apparatus comprising:
An image forming apparatus comprising:
Dependencies are inferred from the claim text.