Fujitsu Corporation

Nobuo Fujita

Masato Kawashima

Hideyuki Nanba

Michihiro Fujii

Akihiro Komuro

Mamoru Watanabe

Shigenori Sasaki

Susumu Fujishima

Sigenori Sasaki

Toshihiro Matsui

A toner image fixing device includes a heat roller, and a backup roller engaged with the heat roller to form a nip therebetween. A paper carrying a toner image is passed through the nip whereby the toner image is thermally fused and fixed on the paper. The heat roller, which is stained by a part of the fused toner during the fixing process, should be cleaned before a toner image is fixed on a successive paper without staining. To this end, a cleaning roller made of a felt material is pressed against the heat roller so as to be rotated together with the heat roller by a frictional force acting therebetween. The cleaning roller must be periodically replaced. The fixing device is constituted such that the replacement of the cleaning roller can be easily and quickly carried out.

Heat roller type toner image fixing device having cleaning roller

Sheet paper feeder for two-sided recording

A developing device using a two-component developer including a vessel for holding the two-component developer, a magnetic roller provided within the vessel and rotatably supported by side walls of the vessel to entrain and bring the developer to a developing zone for a development of an electrostatic latent image, and a doctor blade provided within the vessel to uniformly regulate an amount of the developer entrained by the roller. The ends of the doctor blade are movably inserted into openings formed in the side walls of the vessel, respectively, and the blade is provided with a spring associated therewith such that each of the ends of the blade is resiliently abutted against an end edge which partially defines the opening formed in the corresponding side wall of the vessel, whereby the blade is positioned with respect to the roller to a given clearance therebetween for a uniform regulation of the amount of the developer entrained by the roller. The developing device also includes at least two screw members arranged parallel with each other to define passages for circulating the two-component developer and a partition member, having two end portions, provided between the two screw members, the partition member having a length shorter than that of the screw members, so that developer circulating passages are in communication with each other at the two end portions of the partition member. The developing device have an outlet port formed in the bottom of the device.

Developing device using two-component type developer having doctor blade

A two-sided printing apparatus includes a sheet feeding unit, an image printing unit, a sheet ejecting unit, and a sheet refeeding unit for refeeding a sheet having a first surface on which images have been printed to the image printing unit in order to print images on a second surface of the sheet. The sheet refeeding unit includes a base, an inclined frame rotatably fastened to the base, a first guide member facing the inclined frame, and a second guide member facing the base. The sheet moves downwards between the inclined frame and the first guide member and then moves between the base and the second guide member. The first guide member is rotatably supported so that the first guide member is raised and the inclined frame is lowered, a first space is formed between the lowered inclined frame and the raised first guide member. The second guide member is rotatably supported so that the second guide member is raised, a space is formed between the base and the second raised guide member.

Two-sided printing apparatus

Growing community of inventors

Kawasaki, Japan

Nobuo Fujita