Method and apparatus to prevent a transfer roller from being...

Details Method and apparatus to prevent a transfer roller from being... Method and apparatus to prevent a transfer roller from being...

2006-09-26

2006-09-26

Grimley, Arthur T. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of transfer

C399S045000, C399S121000, C399S297000, C399S389000

Reexamination Certificate

active

07113715

ABSTRACT:
A method and apparatus to prevent a transfer roller from being contaminated by toner in an image forming system, the method comprising setting a print region for a scanning operation according to a comparison result between a previous paper size in a paper cassette and a paper size in a driver; determining a current paper size in the paper cassette based on a time when front and rear ends of the paper are detected by a paper feeding sensor; comparing the current paper size in the paper cassette with the paper size in the driver; and if the paper size in the driver size is larger than the paper size in the paper cassette and the print region for the previous paper size in the paper cassette has not been set, 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: 6295424 (2001-09-01), Regelsberger
patent: 2005/0008381 (2005-01-01), Aono et al.
patent: 56-059277 (1981-05-01), None
patent: 59-118640 (1984-07-01), None
patent: 61-282858 (1986-12-01), None
patent: 61-282859 (1986-12-01), None

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