Fujitsu Corporation

Fuji Xerox Co., Ltd.

Jun Shimizu

Hiroaki Naito

Takashi Suzuki

Yoshihiro Tonomoto

Shinichi Yaoi

Tsutomu Nagatomi

Katsuya Shimatsu

Masaaki Ohyama

Toshimasa Toyama

Toshio Hino

Osamu Watanabe

Yuzuru Sugiura

Takamasa Araki

Kazuyoshi Sakazawa

The present invention is pertained to a cleaning member of a corona wire. An operating screw includes a core and an outer member enclosing the core. The core is rotatable about a rotation axis. The outer member is formed with a spiral groove. The outer member is provided with a plurality of curved surfaces and flat surfaces. The curved surfaces alternate with the curved surfaces, as viewed along the spiral groove of the outer member. The flat surfaces are retreated toward the rotation axis of the core than the curved surfaces.

Operating screw with spiral projection having cylindrical surface and retreat surface

The invention provides a developing apparatus which prevents transportation of aggregated toner powder to an image carrier and thereby assures a high print quality by taking a countermeasure to disperse aggregated toner powder when development of an image carrier with developer which includes toner powder and magnetic powder is performed. The developing apparatus includes a developing roller, a developer control member, and an aggregated toner dispersion member disposed in an opposing relationship to the transport magnetic pole of the fixed magnet on the upstream side with respect to the position of the developer control member and having a contact face in the form of a flat face with which the developer held on the outer circumferential face of the developing roller may be contacted under pressure in order to disperse aggregated toner powder in the developer held on the outer circumferential face of the developing roller. The aggregated toner dispersion member is disposed such that the contact face is spaced by a predetermined distance from the outer circumferential face of the developing roller and an angle defined between the tangential direction to the outer circumferential face of the developing roller at the position of the transport magnetic pole of the fixed magnet and the contact face is within a predetermined angle range.

Having aggregated toner dispersion member developing apparatus

A developing apparatus of an electrophotographic apparatus includes a housing for accommodating a developer, first, second and third developing rollers are rotatably disposed in the housing and arranged opposite to a photoconductor drum for conveying a developer carried on respective surfaces of the developing rollers, and a conveyor roller rotatably disposed in the housing for conveying the developer carried on a surface thereof to one of the developing rollers. First and second screw conveyors are disposed in the housing for conveying the developer in an axial direction opposite to each other. Each of these conveyors has an axial length larger than an axial length of the developing rollers. A partition wall is disposed between the first and second screw conveyors. A toner container for accommodating a toner is mounted on the housing. The toner in the toner container is supplied into the housing and agitators agitate the toner in the housing. A first doctor blade regulates the developer carried on the conveyor roller, a second doctor blade regulates the developer on the first developing roller, and scrapers scrape the developer from the second and third developing rollers.

Electrophotographic image-forming apparatus having developing device

A developer stirring device including stirring paths parallel to each other and stirring screws respectively disposed in the stirring paths, in which a delivering element for a developer is provided on one of the stirring screws and a distributing element is provided on the other of the stirring screws so as to allow the developer to circulate through the stirring paths without stagnation, and a developing device for an image forming apparatus using the same.

Developer stirring device and developing device and image forming

Growing community of inventors

Hyogo, Japan

Jun Shimizu