Developing device having seals between a toner transport roller

Details Developing device having seals between a toner transport roller Developing device having seals between a toner transport roller

1995-09-11

1997-04-29

Grimley, Arthur T.

Electrophotography

Image formation

Development

399103, G03G 1508

Patent

active

056254407

ABSTRACT:
A developing device which includes a first toner transporting roller, a second toner transporting roller to which toner is transported from the first toner transporting roller and an image bearing member such as a photoconductive drum or belt. Seals are located between the circumferential ends of one of the toner transporting rollers and a bottom portion of a toner hopper. When the seals are between the bottom of toner hopper and the first toner transporting roller, the first toner transporting roller is longer than the second toner transporting roller and the circumferential portions of the first toner transporting roller which contact the seals do not contact the second toner transporting roller. Alternatively, when the seals are between the bottom of toner hopper and the second toner transporting roller, the second toner transporting roller is longer than the first toner transporting roller and the circumferential portions of the second toner transporting roller which contact the seals do not contact the first toner transporting roller. Additionally, when the seals contact the second toner transporting roller, side seals may be placed against the ends of the first toner transporting roller. In both of these arrangements, the length of the second toner transporting roller is shorter than a length of an effective area of a photoconductive layer on the image bearing member.

REFERENCES:
patent: 5075728 (1991-12-01), Kobayashi et al.
patent: 5124753 (1992-06-01), Asai et al.
patent: 5212521 (1993-05-01), Ogawa et al.
patent: 5486909 (1996-01-01), Takenaka et al.
patent: 5488462 (1996-01-01), Ishikawa et al.
patent: 5502547 (1996-03-01), Shirai

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