Image formation device with auxiliary roller

Details Image formation device with auxiliary roller Image formation device with auxiliary roller

2006-09-01

2009-08-11

Royer, William J (Department: 2852)

Electrophotography

Internal machine environment

Particle or contaminant control

C399S176000

Reexamination Certificate

active

07574157

ABSTRACT:
An image formation device includes an image-bearing body that rotates, a charging roller that contacts the image-bearing body and is rotated by the rotation of the image-bearing body, and charges the image-bearing body, a cleaning roller that contacts the charging roller and is rotated by the rotation of the charging roller, and cleans the charging roller, and a first auxiliary roller that is provided coaxially with the charging roller, contacts the image-bearing body and is rotated by the rotation of the image-bearing body. The image formation device satisfies the following relation:in-line-formulae description="In-line Formulae" end="lead"?F1>F2>F3in-line-formulae description="In-line Formulae" end="tail"?where F1represents a friction force between the first auxiliary roller and the image-bearing body, F2represents a friction force between the image-bearing body and the charging roller and F3represents a friction force between the charging roller and the cleaning roller.

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