Transfer device
AssigneeRicoh Company, Ltd.
InventorMichio Takahashi
Life of this patent
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Abstract
A transfer device is provided with a cleaning unit having a magnetic brush roller and functions to electrostatically transfer a toner image on an image carrier to a transfer material held on a dielectric body. The device has a transfer charger for applying DC electric field to the portion of the dielectric body opposite to the image carrier during transfer so that the toner image on the image carrier is transferred to the transfer material. The device also has means for applying AC voltage to the transfer charger within a given time during non-transfer, and a DC charger for applying DC electric field with the same polarity as that of the toner particles frictionally electrified to the surface of the dielectric body at least within a given time.
Claims8
A transfer device provided with a cleaning unit having a magnetic brush roller, for functioning to electrostatically transfer a toner image on an image carrier to a transfer material held on a dielectric body, said device comprising:
- a transfer charger for applying DC electric field to the portion of said dielectric body opposite to said image carrier during transfer so that said toner image on said image carrier is transferred to said transfer material;
- means for applying AC voltage to said transfer charger within a given time during non-transfer;
- and
- a DC charger for applying DC electric field with the same polarity as that of the toner particles frictionally electrified to the surface of said dielectric body at least within said given time.
Dependencies are inferred from the claim text.