Hitachi, Ltd.

Shizuo Tsuruta

Masahiko Saito

Yoshitaro Ishii

Akira Sasaki

Kazuhiro Wakamatsu

Nobuo Suzuki

Tadashi Okano

Chikara Hiraoka

Masashi Yamamoto

Katsumi Kumada

Seiji Okunomiya

Keiji Kamio

Hisao Suka

Yoshio Ohuchi

Tomio Hayano

Tetsunori Kaneko

Yoshikatsu Shinonaga

Tetsuro Akatsu

An electrophotographic image forming system having a form cassette for storing forms, a transfer unit for forming an image, a feeder for feeding the forms to the transfer unit and a fusing device for fusing transferred image of the form. The electrophotographic image forming system provides in a path for feeding the form with unfused colored particles (toner) deposited thereon, a form guide so as to contact the non-printing area of the surface of the form with unfused colored particles (toner) deposited thereon.

Electrophotographic image forming system

When the upper case of the developing device is pushed from above, the upper case may be deformed producing a negatively activated pressure corresponding to the deformed volume of the case, thereby dispersing toner along with the air. When the developing device is mounted to or dismounted from the color image forming apparatus, the dispersed toner may fall out of the developing device. To prevent the toner from falling out of the developing device, the toner carrier and the limiting member for limiting the toner layer thickness are held in the developer case and a falling toner receiver is formed which is recessed in the developer case in the longitudinal and widthwise directions of the toner carrier and the limiting member for limiting the toner layer thickness. The falling toner is collected in the receiver, preventing the device from being contaminated with the falling toner and facilitating the cleaning of the device.

Developing device, developing method, and an image forming apparatus

Engaging shafts and are protruded coaxially with a drive roller and driven rollers around which a photosensitive belt is rotatably wrapped inside a photosensitive belt casing, and are positioned in engagement with an engaging groove in a side plate of a frame and with a curved surface formed in a guide rail that guides the photosensitive belt casing. This enables the photosensitive belt to be precisely opposed to an intermediate transfer drum and to developing devices, and to be easily attached to and positioned in the apparatus or detached therefrom.

Image forming apparatus with positioning member of frame engaging shaft

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Kitaibaraki, Japan

Shizuo Tsuruta