Fujitsu Corporation

Futoshi Okabayashi

Kunihiko Sato

Sachio Sasaki

Akira Nagahara

Kenji Fuke

Shin Araki

Kiyoshi Nakamichi

Hideaki Iwasaki

Takamasa Araki

An image forming apparatus wherein an undesirable shock of the transfer sheet is inhibited by a shock inhibit device in at least either of a first period during which the leading end of the transfer sheet passes in the neighborhood of the second roller and a second period during which the trailing edge of the transfer sheet passes in the neighborhood of the first roller.

Image forming apparatus with shock inhibit device

A magnetic brush developing apparatus, comprising: a development container (102) for containing a developer; a magnet (122) stationarily located in the development container and having magnetic poles radially provided on a plurality of points; a rotational sleeve (121) arranged to cover the outer circumference of the magnet and rotatably driven to carry the developer in the development container to an image carrying body (131); and a blade (123) arranged opposite to the sleeve to restrict the amount of the developer which is carried by the sleeve. Two of the magnetic poles are a developing magnetic pole (Pd) facing opposite to the image carrying body (131) and a developer transfer magnetic pole (Pt) located between the developing magnetic pole (Pd) and the blade (123). A magnetic brush of the developer formed on the sleeve (121) by the developer carrying magnetic pole (Pt) has a magnetic flux density. A width or angle of a region where a radial component of the magnetic flux density exceeds over a half of a maximum value thereof, i.e., a half value width, is determined in such a manner that the developer is prevented from flying away from the magnetic brush.

Magnetic brush developing apparatus

Growing community of inventors

Hyogo, Japan

Futoshi Okabayashi