Image forming apparatus having developer supply device

Electrophotography – Image formation – Development

Patent

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Details

399260, G03G 1508

Patent

active

060700351

ABSTRACT:
In an image forming apparatus having a developing unit for developing an image using toner, a toner box for withholding the toner, and a toner transportation section for transporting the toner withheld in the toner box to the developing unit, the toner transportation section includes a transportation screw portion having formed a spiral blade section on its shaft, a pipe section for controlling a toner transportation route by covering the transportation screw portion of the toner transportation section, and a toner flow suppressing section for suppressing flow of the toner from a space between the transportation screw and pipe section. Consequently, a toner transportation opening formed near the transportation section can be closed, and therefore, the flowing of toner into the developing unit can be controlled or reduced by a simple and inexpensive arrangement.

REFERENCES:
patent: 3724725 (1973-04-01), Stauffer
patent: 4558659 (1985-12-01), Alden
patent: 4803513 (1989-02-01), Nishise et al.
patent: 5017966 (1991-05-01), Suga
patent: 5185631 (1993-02-01), Shibata
patent: 5307129 (1994-04-01), Miura et al.
patent: 5629758 (1997-05-01), Kageyama et al.
patent: 5909609 (1999-06-01), Yahata et al.

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