Fixing device having a pressure roller and image forming...

Details Fixing device having a pressure roller and image forming... Fixing device having a pressure roller and image forming...

2005-10-26

2008-03-11

Ngo, Hoang (Department: 2852)

Electrophotography

Image formation

Fixing

C399S328000

Reexamination Certificate

active

07343131

ABSTRACT:
A fixing device is provided with a heat roller (18) and a pressure roller (19) having a shaft (24) and an elastic layer (25) formed on a periphery thereof and being in pressurized contact with the heat roller (18). A concave region (25b), formed in an approximate arc shape in cross-section, is arranged on an end face (25a) of the elastic layer (25) in a longitudinal direction (X) of the pressure roller (19). Accordingly, even when the pressure roller (19) is in pressurized contact with the heat roller (18), since the concave region (25b) deforms to an approximately plane shape only, and the end face (25a) does not protrude outwards, the occurrence of cracking in the elastic layer (25) of the pressure roller (19) can be avoided.

REFERENCES:
patent: 5319430 (1994-06-01), DeBolt et al.
patent: 7218884 (2007-05-01), Miyazaki

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