Transfer unit, transfer method, and image forming apparatus

Details Transfer unit, transfer method, and image forming apparatus Transfer unit, transfer method, and image forming apparatus

2006-04-26

2009-06-16

Gray, David M (Department: 2852)

Electrophotography

Internal machine environment

Particle or contaminant control

C399S071000, C399S297000

Reexamination Certificate

active

07548709

ABSTRACT:
A transfer unit includes: an intermediate transfer belt that (i) holds a toner image that has been transferred from a photoreceptor drum and (ii) moves a surface holding the toner image; and a secondary transfer belt that comes into contact with the intermediate transfer belt. The transfer unit (i) transfers the toner image from the intermediate transfer belt to a sheet conveyed to the secondary transfer part and (ii) includes a cleaning unit that removes and collects toner from the surface of the intermediate transfer belt. The transfer unit also includes a power source for sequentially applying, to the secondary transfer belt, (i) a first voltage for generating an electric field that transfers normally-charged toner from the secondary transfer belt to the intermediate transfer belt and (ii) a second voltage for generating an electric field that transfers oppositely-charged toner from the secondary transfer belt to the intermediate transfer belt.

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