Method and apparatus for preventing transfer roller from...

Details Method and apparatus for preventing transfer roller from... Method and apparatus for preventing transfer roller from...

2006-04-25

2006-04-25

Ngo, Hoang (Department: 2852)

Electrophotography

Having particular structure

Modular or displaceable

C399S066000, C399S389000

Reexamination Certificate

active

07035570

ABSTRACT:
Provided is a method and apparatus for preventing a transfer roller from being contaminated by toner in an image forming system, the method comprising determining a size of paper based on a time when front and rear ends of the paper are detected by a paper feeding sensor; comparing a size of an image formed on a photosensitive drum with the size of the paper; and if the size of the paper is the same as or smaller than the size of the image, determining a separation time of a transfer roller from a transfer belt in consideration of a delay time when the transfer roller is mechanically separated from the transfer belt after a separation command is applied to the transfer roller.

REFERENCES:
patent: 5506660 (1996-04-01), Rabb et al.
patent: 5689760 (1997-11-01), Suzuki et al.
patent: 56-126874 (1981-10-01), None
patent: 2000-075571 (2000-03-01), None
Notice To Submit Response; Samsung Electronics Co., Ltd.,; Application No.: 10-2003-0098229.

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