Ricoh Company, Ltd.

Toshiroh Tokuno

Tomomi Katoh

Akiko Bannai

Tadashi Hayakawa

Masahiro Kuwata

Shotaro Takeuchi

Masanori Kusunoki

Ikoh Soh

Kiyofumi Nagai

Tetsuya Kaneko

Akihiko Gotoh

Masayuki Koyano

Fumitaka Kikkawa

Jun Ichinowatari

Kakuji Murakami

Hitoshi Arita

Nobutaka Osada

Tomohiro Tamai

Tomoko Maeda

Hiroshi Goto

Tamotsu Aruga

Michihiko Namba

Eisuke Hori

Michio Umezawa

Toshitaka Osanai

Kunihiro Uotani

Nobuyuki Akaishi

Kouji Ohnishi

Kaichi Ueno

Kenji Satoh

Kunihiro c/o Ricoh Elemex Corp Uotani

A liquid discharging head includes a nozzle plate including a nozzle substrate having a plurality of nozzle holes to discharge a liquid therethrough and a plurality of dimples on the discharging surface of the nozzle substrate to hold a liquid repellent material inside the plurality of dimples in a flowable manner and a liquid repellency film formed by the liquid repellent material on the discharging surface of the nozzle substrate.

Liquid discharging head, liquid discharging unit, and device to discharge liquid

An improved nozzle plate includes a nozzle substrate having nozzle holes through which droplets are ejected, and a layer containing a compound having a perfluoro polyether skeleton its molecule. The layer is formed on the nozzle substrate on the side on which the droplets are ejected. The surface of the nozzle plate has an X-ray Photoelectron Spectroscopy (XPS) spectrum ascribable to oxygen atom such that the ratio of the area of peak 1 to the area of peak 2 ranges from 0.35 to 0.45, where the peak 1 represents peaks observed between 534 eV and 540 eV and the peak 2 represents peaks observed between 528 eV and 534 eV among peaks between 528 eV to 540 eV.

Nozzle plate, liquid ejection head, and inkjet recording device

A method for supplying a liquid from a liquid tank to a head tank fixed to a liquid-jet head utilizing a liquid supply device in a liquid-jet apparatus is disclosed. The method includes jetting the liquid droplets from the liquid-jet head while maintaining a meniscus pressure of the liquid-jet head within a predetermined range; detecting the meniscus pressure of the liquid-jet head; carrying out, when the detected meniscus pressure is lower than the predetermined range, a first liquid supply operation such that the detected meniscus pressure of the liquid-jet head being lower than the predetermined range is restored to the predetermined range; and carrying out, while the first liquid supply operation is not being carried out, a second liquid supply operation such that the liquid is supplied to the head tank in an amount less than a liquid-jetted amount computed based on a liquid-jet signal.

Liquid supply method in liquid-jet apparatus

An ink cartridge attachable to and detachable from an imaging apparatus, and including an ink accommodating unit; and a cartridge casing having an opening, whereby the ink accommodating unit includes: an ink accommodating body; and an ink supplying portion including a nozzle insertion path and connected to the ink accommodating body, whereby the ink supplying portion is held by the cartridge casing so that the ink supplying portion is rotatable between a position where the nozzle insertion path faces the opening and a position where the nozzle insertion path faces an inner wall surface of the cartridge casing, and when the ink cartridge is attached to the imaging apparatus the ink supplying portion is rotated to direct the nozzle insertion path toward the opening, and when the ink cartridge is detached the ink supplying portion is rotated to direct the nozzle insertion path toward the inner wall surface.

Ink cartridge and an imaging apparatus

An image forming apparatus includes a head tank, a main tank, a pump, and a first control unit, so that when pressure in the head tank is not restored to a predetermined pressure while liquid is supplied from the main tank to the head tank, it is determined that the state of the main tank is an empty state, causing a pump to reversely supply a predetermined amount of liquid from the head tank to the main tank, and stopping printing; and further includes a second control unit, so that when emergency printing is instructed, opening the head tank to air, supplying liquid to the head tank, closing the head tank from air, and supplying liquid from the head tank to the main tank to generate a negative pressure in the head tank are performed.

Image forming apparatus

An image forming apparatus includes a first path through which liquid is supplied to a recording head; a second path connected to a liquid tank; a pressure-adjustment valve connecting the first path with the second path, wherein resistance inside the pressure-adjustment valve changes according to a flow rate of the liquid flowing through the first path; a third path connecting the second path with the pressure-adjustment valve, wherein the third path includes a pump; a fourth path that connects the recording head with the liquid tank and bypasses the pressure-adjustment valve; and an opening/closing valve that opens/closes the fourth path. When an environmental temperature exceeds a threshold, liquid is supplied to the recording head by operating the pump and opening the fourth path. When the environmental temperature is less than the threshold, liquid is supplied to the recording head by operating the pump and closing the fourth path.

An ink cartridge includes a flexible container containing ink; and a restriction mechanism allowing the flexible container to deform only in the direction to decrease the volume of the flexible container. The ink cartridge is used for an image forming apparatus including an inkjet head for jetting ink from nozzles.

Ink cartridge and image forming apparatus including the same

An image forming apparatus is disclosed that includes the pressure adjusting valve including a movable member movably disposed in the pressure adjusting valve, a first throttling part; and a second throttling part, wherein the second throttling part is formed as a gap between an internal wall of the frame of the pressure adjusting valve and the movable member, an internal fluid resistance of the pressure adjusting valve varies in response to the flow rate of the liquid, and when the liquid is discharged from the nozzle, the liquid is fed from the liquid tank to the recording head by the liquid feeding unit in a state where the recording head is in fluid communication with the liquid tank via the pressure adjusting valve.

An ink cartridge removably mountable in an image forming apparatus includes a flexible storage member, a pressurization-space formation member, an output port, and an opening-and-closing assembly. The flexible storage member stores ink. The pressurization-space formation member hermetically houses the storage member and forms a pressurization space to which a fluid is supplied between the pressurization-space formation member and the storage member. The output port is connected to the storage member, through which the ink is supplied from the storage member to the image forming apparatus. The opening-and-closing assembly opens and closes between the output port and the storage member by the fluid supplied into the pressurization space.

Ink cartridge and image forming apparatus employing the ink cartridge

A liquid carrying container which is removably mounted to a body of an image forming device is disclosed. The liquid carrying container includes a liquid containing bag which contains liquid; and a supply port section which has an elastically deformable portion through which a hollow nozzle member is pierced from the side of the image forming device, wherein the supply port section is directly held within a recess section formed on the liquid containing bag, and the hollow nozzle member penetrates through the supply port section and the liquid containing bag to face inside the liquid containing bag.

Liquid carrying container and image forming device

An ink set includes at least two aqueous inks A and B with different colors, the inks A and B used in an inkjet recording method in which the inks A and B are superimposed for formation of a color image, wherein the ink A contains water-dispersible colorant A1 free of a surfactant-based dispersant, and anionic compound A2, and wherein the ink B contains water-dispersible colorant B1 containing a surfactant-based dispersant.

Ink set, ink cartridge, inkjet recording method, and inkjet recording apparatus

An imaging-material container that stores imaging material to be supplied to an image forming device includes a flexible storage member, a pressure unit, a regulation member, and a pushing unit. The flexible storage member stores imaging material. The pressure unit applies pressure on the flexible storage member. The regulation member contacts the flexible storage member to deform the flexible storage member. The pushing unit moves the regulation member as the imaging material is consumed.

Imaging-material container, ink cartridge, and image forming apparatus

A liquid discharging-type image forming apparatus capable of securely eliminating mixed air bubbles from the ink liquid and forming a stable image. The apparatus includes: a sub tankof which negative pressure amount is detected; a pumpsucking ink when the detected amount of the sub tankis lower than a predetermined amount so that the sub tankand recording headshave negative pressure; a second backflow prevention unitto stop the sent ink to be reserved in a second liquid containerwhich is pressurized as ink increases. When the ink is again filled in the sub tankthe ink is sent from the second liquid containerbefore being sent from the first liquid container. Accordingly, ink is not accumulated in the second liquid containerallowing the second liquid containerto be smaller and the image forming apparatus as a whole to be more compact.

An image forming apparatus includes a recording head, a liquid tank, a first fluid flow path supplying liquid to the recording head, a second fluid flow path being in communication with the liquid tank, a pressure adjusting valve allowing fluid communication between the first and the second fluid flow paths, a cap member covering a nozzle surface of the recording head, and a suction unit being in communication with the cap member. The pressure adjusting valve includes a movable member movably disposed in the internal fluid flow path, wherein the movable member includes a sealing unit that seals the communication between the first and the second fluid flow paths when the cap member covers the nozzle surface of the recording head and a negative pressure is generated in a cap-member space formed between the cap member and the nozzle surface by driving the suction unit.

Growing community of inventors

Tokyo, Japan

Toshiroh Tokuno