Developing device and image forming apparatus

Details Developing device and image forming apparatus Developing device and image forming apparatus

2006-03-29

2008-09-02

Gleitz, Ryan (Department: 2852)

Electrophotography

Image formation

Development

Reexamination Certificate

active

07421233

ABSTRACT:
A developing device (100) according to the present invention is provided with a housing (102) for holding toner, conveying screws (104, 105) arranged in the housing (2) and each including a rotary shaft (107) and a blade (106) arranged on the rotary shaft (107) for conveying the toner from one end of the rotary shaft (107) toward the other end thereof by the rotation of the rotary shaft (107), and a developing roller (103) provided in the housing with a part of the developing roller (103) being exposed from the housing, and rotatable to obtain the toner conveyed by the conveying screws (104, 105). The conveying screws (104, 105) are constructed, for the efficient agitation of the toner, such that toner pressing forces of the blades (106) differ depending the angle of rotation of the rotary shaft (107).

REFERENCES:
patent: 5963766 (1999-10-01), Okuno et al.
patent: 6577834 (2003-06-01), Suzuki
patent: 2001-255723 (2001-09-01), None
patent: 2002031940 (2002-01-01), None
patent: 2003107859 (2003-04-01), None
patent: 2003-167421 (2003-06-01), None

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