Image forming apparatus

Details Image forming apparatus Image forming apparatus

2011-03-29

2011-03-29

Porta, David P (Department: 2884)

Electrophotography

Internal machine environment

Forced air circulation

C399S099000

Reexamination Certificate

active

07917051

ABSTRACT:
An image forming apparatus wherein a printing medium can be prevented from being stained with toner leaking out of a developing device. As a photosensitive drum rotates in a direction, an air flow in the rotating direction is generated around the photosensitive drum. Guides that define a part of a sheet path are disposed to guide a sheet to between a transfer roller and the photosensitive drum. The guides are located in positions downstream from the developing device and upstream from the transfer roller with respect to the rotating direction of the photosensitive drum and face the photosensitive drum. A fan is disposed to generate an air flow passing below the guides. An air passage for directing part of the air flow generated around the photosensitive drum to the air flow passing below the guides is made in a position upstream from the sheet path and downstream from the developing device with respect to the rotating direction of the photosensitive drum.

REFERENCES:
patent: 7403732 (2008-07-01), Shimazu et al.
patent: 2005/0244178 (2005-11-01), Kitayama
patent: 2007/0059024 (2007-03-01), Kitayama
patent: 2008/0101816 (2008-05-01), Nogami
patent: 2002-278387 (2002-09-01), None
patent: 2004-272144 (2004-09-01), None
patent: 2005-258275 (2005-09-01), None

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