Electrophotography – Internal machine environment – Particle or contaminant control
Reexamination Certificate
1998-11-09
2001-02-06
Royer, William J. (Department: 2852)
Electrophotography
Internal machine environment
Particle or contaminant control
C399S104000
Reexamination Certificate
active
06185393
ABSTRACT:
FIELD OF THE INVENTION AND RELATED ART
The present invention relates to a developing apparatus, a magnetic seal mounting method and a process cartridge.
The process cartridge contains integrally electrophotographic photosensitive member and charging means, developing means or cleaning means, and is detachably mountable relative to a main assembly of the image forming apparatus. It may integrally contain the electrophotographic photosensitive member and at least one of the charging means, the developing means and the cleaning means. As another example, it may contain the electrophotographic photosensitive member and at least the developing means.
In an electrophotographic image forming apparatus using an electrophotographic image forming process, the process cartridge is used, which contains the electrophotographic photosensitive member and process means actable on said electrophotographic photosensitive member, and which is detachably mountable as a unit to a main assembly of the image forming apparatus (process cartridge type). With this process cartridge type, the maintenance of the apparatus can be carried out in effect by the user without depending on a serviceman. Therefore, the process cartridge type is now widely used in electrophotographic image forming apparatuses.
The process cartridge is provided with a seal for preventing the developer from leaking out.
The present invention is directed to a further improvement of such a process cartridge and a developing apparatus.
SUMMARY OF THE INVENTION
Accordingly, it is a principal object of the present invention to provide a developing apparatus, a magnetic seal mounting method and a process cartridge wherein developer is prevented from leaking out.
It is another object of the present invention to provide a developing apparatus, a magnetic seal mounting method and a process cartridge wherein the mounting operativity of the magnetic seal is improved.
It is a further object of the present invention to provide a developing apparatus, a magnetic seal mounting method and a process cartridge wherein the mounting operativity of the magnetic seal on a developing frame is improved.
It is a further object of the present invention to provide a developing apparatus, a magnetic seal mounting method and a process cartridge wherein developer (toner) is prevented from leaking out around a magnetic seal.
These and other objects, features and advantages of the present invention will become more apparent upon a consideration of the following description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5084733 (1992-01-01), Katoh et al.
patent: 5187326 (1993-02-01), Shirai
patent: 5274425 (1993-12-01), Fukumoto et al.
patent: 5502547 (1996-03-01), Shirai
patent: 5655178 (1997-08-01), Ishikawa et al.
patent: 5697021 (1997-12-01), Watanabe et al.
patent: 5812909 (1998-09-01), Oguma et al.
patent: 0 851 313 (1998-07-01), None
patent: 10-039630 (1998-02-01), None
Karakama Toshiyuki
Numagami Atsushi
Canon Kabushiki Kaisha
Fitpatrick, Cella, Harper & Scinto
Royer William J.
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