Hitachi Koki Co., Ltd.

Ricoh Company, Ltd.

Yuichiro Suzuki

Yoshitaka Fujinuma

Masayuki Ainoya

Kenji Nozawa

Katsumi Kumada

Koji Kato

Kenji Nakamura

Masayasu Anzai

Takashi Suzuki

Junji Shirakawa

Yasuo Takuma

Chikara Hiraoka

Tsuneaki Kawanishi

Minoru Toyoda

Yasushi Hashimoto

Hisao Okada

Makoto Kurosawa

Katsumasa Mikami

Tsutomu Nakagawa

Shoji Takeya

Katsuya Kawai

Tomonari Hokkyo

Masaaki Koseki

Hiroyoshi Matsumoto

Kouichi Oomori

Hiroshi Tsunoda

Yoshitaka Omori

According to an aspect of the present invention, there is provided a developing device including: a roller that develops an electric latent image formed on an image holding body; a chamber that stores a toner; a case that houses the roller and the chamber; a concave portion that is inwardly concaved from the case and that includes: a sidewall, a bottom, and a filling port formed in the bottom; and a first lid that closes the filling port.

Developing device and image forming apparatus using the same

A rotary member includes a rotating main body, and support members that are formed to be supported by bearings. Each of the support members includes a spindle core formed of a first metal, and a cylindrical sheath that sheathes a portion of the spindle core where slidably contacting respective one of the bearings and that is formed of a second metal different from the first metal.

Rotary member, developing device, and image forming apparatus

A toner cartridge includes a container for containing toner of a volume of 2500 cm or more. The container defines an opening portion, a cap is fixed to the opening portion of the container, and the cap defines a first semicircle opening portion. A film covers and seals the first semicircle opening portion of the cap. A shutter is rotatably disposed on the cap and the shutter defines a second semicircle opening portion capable of corresponding to the first semicircle opening portion of the cap, the shutter having a diameter of 70 mm or above.

Toner cartridge

An image forming apparatus includes a developing unit having a photoreceptor, for making an electrostatic latent image on a surface of the photoreceptor visible as a toner image. A toner hopper stores toner to be supplied to the developing unit and a cleaning device removes and recovers the toner remaining on the surface of the photoreceptor after the toner image has been transferred onto a recording material. A toner transporting passage is connected between the cleaning device and the toner hopper, through which the toner recovered by the cleaning device is returned to the toner hopper. A toner exhausting port is disposed at a part of the toner transporting passage, from which the toner being returned from the cleaning device side is exhausted outside the toner transporting passage. An opening and closing member selectively opens or closes the toner exhausting port, wherein an inner diameter of the toner exhausting port is made larger than that of the toner transporting passage.

Imaging forming apparatus having a toner exhausting device

Toner bottle cap

Photosensitive drum for printer

A uniform image is obtained by matching the sliding friction force, the moving speed and the developing agent in a developing region of two developing rollers and an electric characteristic of a photosensitive body used for image development. Two developing rollers rotating in directions opposite to each other are used, the moving direction of the first developing roller being opposite to the moving direction of the photosensitive body, and a circumferential speed ratio of a circumferential speed of the first developing roller to a circumferential speed of the photosensitive body is within a rage of 0.5 to 2.5; and the moving direction of the second developing roller is equal to the moving direction of the photosensitive body, and a circumferential speed ratio of a circumferential speed of the second developing roller to a circumferential speed of the photosensitive body is within a range of 1.5 to 3.5. A ratio of the sliding friction force between a magnetic brush for developing agent and the photosensitive body formed in the first developing roller and the sliding friction force between a magnetic brush for developing agent and the photosensitive body formed in the second developing roller is within a range of 0.9 to 2.1.

Electrophotographic apparatus

In an electrophotographic printing mechanism in which a photosensitive drum mechanism having a photosensitive drum and a drum cap is turned to electrostatically form an image on the photosensitive material wound on the drum, the drum cap is provided with a switch which is operated by a switch control unit, so that when the mechanism is stopped for urgent work, the operator is protected from being struck by electricity touching the drum cap.

Electrophotographic printing mechanism

Growing community of inventors

Ibaraki, Japan

Yuichiro Suzuki