Ricoh Company, Ltd.

Tdk Corporation

Ryuji Yoshida

Yoshinori Nakagawa

Tomoko Takahashi

Takuya Morinaga

Wataru Takahashi

Nobuyoshi Suzuki

Yuusuke Shibasaki

Katsuhiro Kosuge

Hideki Zemba

Hiroyuki Sugiyama

Takashi Saito

Kazuhisa Sudo

Shingo Matsushita

Masahiko Shakuto

Ikuhisa Okamoto

Shunichi Hashimoto

Takamasa Ozeki

Takehide Mizutani

Hiroaki Maeda

Yukiko Iwasaki

Hirokatsu Suzuki

Takahiro Yoshida

Makoto Hidaka

Hidehiko Fujiwara

Takashi Bisaiji

Norio Kimura

Hiroshi Nakai

Atsushi Kurokawa

Hiroaki Takahashi

Yukio Otome

Takashi Nakano

Kenichiro Morita

Yoshio Hattori

Masumi Sato

Masanori Kawasumi

Michitaka Suzuki

Akio Kosuge

Takuya Sano

Shinichi Kawahara

Shin Kayahara

Ichiro Kadota

Nobuyuki Koinuma

Mikio Ishibashi

Taichi Urayama

Akihiro Musha

Naoyuki Ozaki

Mugijirou Uno

Shotaro Hoshi

Kazuhiko Yuki

Ryusuke Mase

Takashi Sakamaki

Kohsuke Yamamoto

Reki Nakamura

Megumi Ohtoshi

Hideaki Kanaya

Takayuki Nakai

Masaki Sukesako

Takuya Suganuma

Satoru Ishikake

Junichi Iwata

Shuji Tanaka

Koki Sakano

Shigekazu Enoki

Yoshiyuki Fukuda

Atsushi Fujita

Takashi Fukumoto

Kanshi Abe

Hideki Tobinaga

Shiomi Andou

Masato Watanabe

Tokuya Ojimi

Mamoru Kambayashi

Takakazu Kihira

Hirotaka Hayashi

Yusuke Mitani

Hirohmi Tamura

Tetsuto Ueda

Kazuya Saitoh

Isamu Suzuki

Sho Sekiguchi

Hiroomi Tamura

Toshimichi Odaka

Masami Iwama

Nagayasu Yoshida

Ryoh Tanoue

Hideki Zenba

Shinji Minami

Sho Akiyama

Masataka Fukuchi

Hiroki Atari

Katsuya Ishii

Shigekazu Koguchi

A liquid circulating apparatus includes a circulation route configured to circulate liquid through a liquid ejecting head, the circulation route including: a supply-side tank leading to a supply port of the liquid ejecting head; and a discharge-side tank leading to a discharge port of the liquid ejecting head, wherein the liquid is circulated by setting pressure in the supply-side tank higher than pressure in the discharge-side tank, and a sum of the pressure in the supply-side tank and the pressure in the discharge-side tank is set smaller when initial filling for filling the circulation route with the liquid is performed than when the liquid is circulated.

Liquid circulating apparatus and liquid ejecting apparatus

A liquid circulation device includes a first liquid discharge head to discharge a liquid, a first supply channel to supply the liquid to the first liquid discharge head, a first collection channel to collect the liquid from the first liquid discharge head, a second liquid discharge head to discharge the liquid and disposed higher than the first liquid discharge head, a second supply channel to supply the liquid to the second liquid discharge head, a second collection channel to collect the liquid from the second liquid discharge head, a supply-side fluid restrictor disposed in the first supply channel to make a fluid resistance value of the first supply channel greater than a fluid resistance value of the second supply channel, and a collection-side fluid restrictor disposed in the second collection channel to make a fluid resistance value of the second collection channel greater than a fluid resistance value of the first collection channel.

Liquid circulation device and liquid discharge apparatus

A liquid discharge head includes a plurality of nozzles from which liquid is discharged, a plurality of individual-liquid-chambers communicating with the plurality of nozzles, respectively, a plurality of individual-drainage-channels communicating with the plurality of individual-liquid-chambers, respectively, a drainage-side common-liquid-chamber communicating with each of the plurality of individual-drainage-channels, a filter having filter holes and disposed between the plurality of individual-drainage-channels and the drainage-side common-liquid-chamber, and an intermediate-drainage-channel disposed between the filter and the plurality of individual-drainage-channels. The intermediate-drainage-channel faces the filter and communicates with two or more of the plurality of individual-drainage-channels. A cross-sectional area of the intermediate-drainage-channel is greater than a cross-sectional area of each of the plurality of individual-drainage-channels communicating with the intermediate-drainage-channel in a direction perpendicular to a direction of liquid flow.

Liquid discharge head, liquid discharge device, and liquid discharge apparatus

An image forming apparatus includes an electrostatic latent image bearer; a charger to charge a surface of the electrostatic latent image bearer; a power source to output a charging bias supplied to the charger; an electrostatic latent image writing unit to write an electrostatic latent image on the surface of the electrostatic latent image bearer charged by the charger; a developing unit including a developing member to develop the electrostatic latent image to obtain a toner image; a developing power source to output a developing bias supplied to the developing unit; a processor to adjust the charging bias output from the power source to a predetermined target value; and a storage unit to store an adjustment value algorithm.

Image forming apparatus

A paper binding device comprises: a pair of binding members that has a pair of teeth portions, and presses to bind a bundle of paper sheets; a moving unit that causes one of the pair of binding members to move along with the other of the pair of binding members between a binding position at which the bundle of paper sheets is bound and a retracted position; a separating unit that moves coordinating with movement of the one of the pair of binding members, and when the one of the pair of binding members moves from the binding position to the retracted position, that contacts with the bundle of the paper sheets and causes the bundle of paper sheets to separate from the one of the pair of binding members; and a restricting member that stops the separating unit at a restricting position between the binding position and the retracted position, when the one of the pair of the binding members moves from the binding position to the retracted position.

Paper binding device, paper processing apparatus, image forming apparatus, and image forming system

A sheet processing apparatus includes: a sheet fastening unit of a pressing fastener method in which a bundle of sheets is fastened by using a pair of pressing fastener members; a conveying unit that conveys the bundle of sheets that are fastened by the sheet fastening unit; a separating unit that, after the sheet fastening unit performs a fastening operation on the bundle of sheets, moves both one and the other pressing fastener members, between which the bundle of sheets is interposed, so as to separate a sheet that adheres to the pressing fastener member; and a control unit that, after the separating unit finishes an operation to separate the sheet, controls the conveying unit so as to convey the bundle of sheets that are fastened by the sheet fastening unit.

Sheet processing apparatus, image forming system, and image forming apparatus

A development device is operable in multiple different speed modes and includes a developer bearer to carry developer, a developer regulator to adjust an amount of developer carried on the developer bearer, and multiple developer conveyance members disposed facing the developer bearer to transport developer in a longitudinal direction to circulate developer inside the development device. The multiple developer conveyance members including a first developer conveyance member to supply developer to the developer bearer and a second developer conveyance member to transport developer collected from the developer bearer. The development device executes developer amount balance adjustment in which a driving velocity of at least the multiple developer conveyance members is increased from a driving velocity in a lower-speed mode for a predetermined period after image development in the lower speed mode is completed and before image development in a higher speed mode is started.

Development device, process cartridge, image forming apparatus incorporating same, and developer amount adjustment method therefor

According to an aspect of an embodiment, a sheet processing apparatus includes: a conveying unit configured to convey sheets; a stacking unit configured to stack the conveyed sheets to form a sheet stack; and a binding unit configured to include a pair of toothed jaw and bind the sheet stack by pressing the sheet stack between the pair of toothed jaw, wherein at least one portion of edges of the toothed jaw is rounded.

Sheet processing apparatus having binding unit and image forming system thereof

An image forming apparatus includes a latent image bearing member, a charging unit, a charging power source, a latent image writing unit, a development unit, a transfer unit, a toner detector, and a controller. The controller causes a background fog pattern to be formed on a surface of the latent image bearing member. In addition to the background fog pattern, the controller causes a latent image to be developed to form a toner image used for position identification on the surface of the latent image bearing member. The controller identifies a time when the toner image used for position identification has entered a detection range of the toner detector based on a change in outputs of the toner detector to determine a time when each of sections of the background fog pattern enters the detection range based on the identified time.

Image forming apparatus and image forming method

The present invention is concerning a method for attaching a pair of crimping members in a sheet binding device that binds a sheet bundle by engagement of the pair of crimping members, wherein at least one of the crimping members is attached to a member to which the one of the crimping members is to be attached in a state where the pair of crimping members is in engagement.

Method for attaching crimping members, sheet binding device, and image forming apparatus

An image forming apparatus includes a latent image carrier, a charging device, a latent image forming device, a developing device, a transfer device, a toner amount detector, and a control circuit to execute an imaging condition determination process. The control circuit obtains a linear approximation formula of a developing potential and an amount of toner according to an exposure potential of the patch pattern and a detected amount of toner to calculate a developing gamma and a developing start voltage according to a gradient of the linear approximation formula, determines target charging potential, exposure potential and developing bias according to the developing gamma and the developing start voltage, determines an amount of a background potential to be corrected according to a difference between the developing start voltage and a target developing start voltage obtained according to environmental information, and corrects the target charging potential.

Image forming apparatus and image density control method employed by the image forming apparatus

The image forming apparatus includes a process unit, a latent image writer, a power source, and a controller. The process unit is detachably attachable relative to the image forming apparatus and includes, as a single integrated unit, a latent image bearing member to bear a latent image on a surface thereof, a charging device to charge the surface of the latent image bearing member, and a development device to develop the latent image with toner. The controller causes the power source to output a charging bias at a predetermined target level supplied to the charging device. The process unit includes a first storage device to store correction information for calculating the predetermined target level of the charging bias in accordance with a combination of the latent image bearing member and the charging device. The controller corrects the predetermined target level based on the correction information in the first storage device.

An image forming apparatus including multiple imaging units and a fixing unit is provided. Each of the imaging units includes an image bearing member, a developing device containing a toner including a pressure-induced phase transition resin or a thermoplastic resin, a transfer device, and an image bearing member cleaner, and is adapted to form a toner image with the toner. The fixing unit includes a pressure fixing device adapted to fix the toner including the pressure-induced phase transition resin on the recording medium by applying a temperature Tb and a pressure Pb thereto in a pressure fixing nip, and a heat fixing device adapted to fix the toner including the thermoplastic resin on the recording medium by applying a temperature Ta and a pressure Pa thereto in a heat fixing nip. The image forming apparatus satisfies the following inequations: Tb&#x3c;Ta and Pb&#x3e;Pa.

Image forming apparatus with fixing unit adapted to fix toner including pressure-induced phase transition toner

A sheet processing apparatus includes: a loading tray on which a sheet is loaded; a pair of ejection rollers that eject the sheet to the loading tray and in which a pair or roller members are configured to be able to contact with and separate from each other; a pair of shift rollers that is provided upstream of the pair of ejection rollers in a sheet conveyance direction, are movable in a sheet width direction that is a direction perpendicular to the sheet conveyance direction, convey the sheet towards the loading tray, and performs a shift operation of shifting the sheet to a different position in the sheet width direction; and a control unit that performs control to change, based on sheet information, a shift operation timing of the sheet by the pair of shift rollers and a contacting and separating timing of the pair of ejection rollers.

Sheet processing apparatus and image forming system

A postprocessing apparatus includes a stacking unit that stacks a sheet, an abutting unit that corrects a conveying direction of the sheet, a return roller that abuts the sheet against the abutting unit, a shift conveying unit that shifts the sheet in a width direction, and a width direction detector that detects a width direction position of the sheet. When the sheet is shifted by the shift conveying unit by a predetermined amount, passed to the return roller, and abutted against the abutting unit, distances A and B are nearly the same, where the distance A is a distance from a conveying direction position of a side of the sheet to a rear end of the sheet and the distance B is a distance from the return roller to the abutting unit.

Postprocessing apparatus, and image forming apparatus and image forming system including the postprocessing apparatus

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Kanagawa, Japan

Ryuji Yoshida