Fujitsu Corporation

Yoshiki Nagasaki

Tetsuya Takei

Kiyoshi Taninaka

Hiroyuki Kawai

Takumi Kawamura

Morihisa Kawahara

Nobuo Kuwabara

Junji Wakihara

Shigeo Nonoyama

Michio Shimura

Minoru Takano

Kunihiro Kitsu

Shigeru Akema

Tomohisa Mikami

A fixation unit that fixes toner onto a recording paper includes a thermal fixation roller, a heating part that heats the thermal fixation roller, a compressing part that presses the thermal fixation roller, and a drive gear, mounted on the thermal fixation roller, which rotationally drives the thermal fixation roller, wherein an outer diameter of the thermal fixation roller is equal to or larger than an inner diameter of the drive gear, as the heating part heats the thermal fixation roller.

Fixation unit, thermal fixation roller, and recording apparatus and its manufacture method

An electrophotographic image forming apparatus includes an electrostatic latent image carrying body, an electric charger for uniformly electrifying the carrying body, an optical exposure unit to form an electrostatic latent image on the carrying body, a developer for developing the electrostatic latent image to form a toner image on the carrying body, a transfer unit for transferring the toner image from the carrying body onto a printing sheet, a fixing unit for fixing the toner image to the printing sheet, a cleaner for cleaning to remove residual toner from the carrying body and a toner returning mechanism for returning the residual toner removed by the cleaner to the developer. The developer includes a housing in which a toner chamber is defined, a developing roller rotatably mounted in the housing, an agitator rotatably mounted in the housing so as to be positioned in the toner chamber, a partitioning member provided in the housing for defining a carrier chamber adjacent to the developing roller. The toner returning mechanism includes a toner recirculator for recirculating the residual toner removed from the carrying body to the toner chamber.

Image forming apparatus having a toner cartridge

An ink cartridge connectable to a print head having a supply pipe which receives a supply of ink includes a casing having a first, upper chamber and a second, lower chamber communicating with each other via a communicating hole and storing the ink, a porous body provided in the first chamber and storing the ink by a negative pressure, and a connection part provided in the second chamber and connectable to the supply pipe. The connection part has normally closed valve means for communicating the print head with the second chamber by opening when the supply pipe is inserted into the connection part. The ink cartridge includes a connecting pipe extending from the first chamber into the second chamber and a filter member covering the opening of the connecting pipe in the second chamber. The filter member releases air from the connecting pipe upwardly into an upper region of the second chamber.

Ink cartridge with residual ink retaining structure

A backup unit is provided with respect to a nozzle of a print head for printing by injecting ink, and sucks the ink from the nozzle, the backup unit including: a nozzle cap sealing the nozzle by making contiguous contact with the print head; a pump; and an ink path communicating the nozzle cap and the pump; wherein the pump includes: a bellows part having an internal space formed therein; a movable rod fixed to the bellows part and having an ink passage therein; a slide valve provided in the bellows part and slidable with respect to the rod, the slide valve closing and opening a hole provided at one end of the ink passage with respect to the internal space, depending on a position of the movable rod; an ink inlet provided at the other end of the ink passage and communicating with the ink path; and an ink outlet communicating with the internal space depending on a position of the slide valve, the slide valve having a stroke shorter than a stroke of the rod, a volume of the internal space within the bellows part increasing and decreasing as the slide valve makes a reciprocating motion in a direction parallel to a center axis of the rod, the slide valve sucking the ink from the nozzle via the ink inlet by opening the hole of the ink passage to the internal space when the rod is at a position where the volume of the internal space is a maximum, and discharging the ink in the internal space via the ink outlet as the volume of the internal space decreases.

Ink jet printer having backup unit with any one or both of a pump

Image-forming apparatus comprising a process unit

Growing community of inventors

Kawasaki, Japan

Yoshiki Nagasaki