Device and method for forming a nip in an image forming...

Details Device and method for forming a nip in an image forming... Device and method for forming a nip in an image forming...

2011-07-05

2011-07-05

Porta, David P (Department: 2884)

Electrophotography

Having particular structure

Modular or displaceable

C399S066000, C399S154000, C399S302000, C399S313000

Reexamination Certificate

active

07974552

ABSTRACT:
An image forming apparatus includes an image carrier which moves while carrying an image and a transfer roller including a roller base material which faces the image carrier and rotates. A concave portion is positioned on a peripheral surface of the roller base material. A grip unit on the concave portion grips a recording medium. An elastic layer is disposed on a peripheral surface of the roller base material. The transfer roller grips a recording medium by the grip unit when the concave portion faces the image carrier and passes the recording medium through a nip between the image carrier and the elastic layer when facing each other so that the image carried on the image carrier is transferred on the recording medium. A roller driving unit rotates the roller base material. A control unit controls the roller driving unit to adjust a timing for forming the nip.

REFERENCES:
patent: 6026257 (2000-02-01), Takami et al.
patent: 7376375 (2008-05-01), Kobayashi et al.
patent: 2005/0201789 (2005-09-01), Yuminamochi
patent: 2010/0260522 (2010-10-01), Imamura et al.
patent: 2000-238400 (2000-09-01), None
patent: 2009-014808 (2009-01-01), None

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