Hitachi Koki Co., Ltd.

Ricoh Company, Ltd.

Hitachi Printing Solutions, Ltd.

Hitachi, Ltd.

Ricoh Printing Systems, Ltd.

Hiroshi Takahagi

Hideki Tanaka

Takeshi Shimizu

Yutaka Shoji

Nobuhiro Noto

Kenji Yamada

Kenichi Kugai

Shigenori Suematsu

Yoshitaka Akiyama

Shuichi Morio

Masahito Katada

Hideki Ishida

Takashi Tomita

Takashi Sato

Junji Shirakawa

Takashi Yoshida

Tsutomu Maekawa

Osamu Machida

Fumio Takeda

Kunihiro Tamahashi

Masao Miyasaka

Akemi Ouchi

Yoshikazu Ishitsuka

Yoshinari Suzuki

Hidetoshi Fujii

Junichi Suzuki

Mitsugu Asano

Nobuhiro Kurosawa

Hiroshi Azami

Makoto Shinohara

Masanao Yuza

Tsutomu Omine

Akira Kashimura

Akira Igarashi

Hideaki Mamiya

A liquid supply device includes a collection sub tank and a collection flow path. The collection sub tank collects liquid from a liquid discharge head. The collection flow path connects the liquid discharge head and the collection sub tank. The collection sub tank includes a first inflow port connected with the collection flow path and a first inner wall portion on an extension line extending from the first inflow port in a direction in which the liquid flows into the collection sub tank from the collection flow path. The first inner wall portion has one of an inclined surface inclined with respect to the extension line, an arc-shaped surface, and a curved surface.

Liquid supply device, liquid discharge device, and liquid discharge apparatus

An ink-jet recording head includes a recording head and pressure damper assembly module including a recording head part at a lower position having nozzle holes on an under surface and an ink passage communicating with the nozzle holes, and a pressure damper part higher than the recording head part having an ink containing chamber inside. The ink-jet recording head further includes first flexible tube supplying ink in the ink containing chamber to the ink passage and connecting an ink discharge part communicating with the ink containing chamber and an ink supply part at one end side in the recording head part communicating with one end of the ink passage; and a second flexible tube connected with another end side in the recording head part and communicating with another end of the ink passage. At least the inside of the first flexible tube is filled with the ink.

Ink-jet recording head and ink-jet recording apparatus having the same

A sheet feed apparatus, e.g., coupled to an image forming apparatus, can include: a main frame; a storage unit mounted on the main frame and configured with a capacity to store a large quantity of sheet-like material; a transporter mounted on the main frame and configured to supply the sheet-like material to the image forming apparatus; an additional unit adapted to be mounted on the main frame and operable to enhance a functionality of at least one of the sheet feed apparatus and an image forming apparatus; and a supporting frame mounted on the main frame in place of the additional unit, and further adapted such that the additional unit is mountable thereon; the additional unit being mounted on the supporting frame.

Image forming system having enhanced functionality

A three-dimensional laminating molding device includes ejection heads that eject support material for a support, and an ejection head that ejects mold material for a mold. The support material is sold at room temperature. An inner temperature of the laminating molding device during the laminating molding is controlled to a range of (a melting point of the support material&#x2212;30)&#xb0; C. to (the melting point of the support material&#x2212;5)&#xb0; C.

Three-dimensional laminating molding device

An inkjet head includes a pair of support plates A, B and a diaphragm plate interposed between the support plates A, B. In this configuration, even when adhesion between the diaphragm plate and the support plate B is insecure, and when a piezoelectric element deforms a diaphragm toward a pressure chamber , that is, in a direction away from the support plate B, the support plate A prevents the diaphragm plate from peeling off the support plate B. Accordingly, the dimension and thus a deforming amount of the diaphragm is maintained uniform, whereby a uniform ink ejection performance is maintained.

Configuration of inkjet head realizing uniform ink ejection performance

An ink jet print head includes pressure chambers, nozzles, and ink channels in a one-to-one correspondence. A diaphragm forms a side of each pressure chamber. The ink channels are formed in a restrictor plate. Piezoelectric elements are attached to the diaphragm and to a piezoelectric element fixing plate, which supports the piezoelectric elements. A housing of the head is formed with a common ink channel for supplying ink to the ink channels and an internal space into which the piezoelectric elements and the piezoelectric element fixing plate are at least partially inserted. A cover is provided for covering the piezoelectric element fixing plate. The cover is connected to the housing and is provided with an internal space large enough to maintain a gap between the cover and the piezoelectric element fixing plate.

Ink jet print head and method of production thereof

An ink jet print head includes pressure chambers, a diaphragm forming a side of the pressure chambers, stacked piezoelectric elements, a piezoelectric element fixing plate, and a housing. The stacked piezoelectric elements are attached to the diaphragm in a one-to-one correspondence with pressure chambers. The piezoelectric element fixing plate is fixedly attached to and supports the stacked piezoelectric elements. The housing includes a common ink channel portion that supplies ink to the pressure chambers. The piezoelectric element fixing plate and the stacked piezoelectric elements are disposed at least partially in the space defined by the diaphragm and internal side walls of the ink channel portion with a gap existing between the piezoelectric element fixing plate and the internal side walls.

An appropriate pulse width of a driving pulse for driving a piezoelectric element of ink jet head is determined by using the head difference. That is, the pulse width with which the least change in the ink speed occurs can be used as the pulse width of the driving signal for the piezoelectric actuator. As a result, a reliable ink jet printer head capable of stably ejecting ink droplets over a long period of time and having excellent frequency characteristics can be provided.

Drive method for ink jet head

A method of forming a high-quality image on an elongated recording medium, such as a roll of paper sheet. When an image includes a character which stretches between two print regions, a blank line portion of the image is detected. When image forming operation is performed for forming a portion of the image up to the blank line, sheet feed operations are performed. Then, image forming operation for a remaining portion of the image is performed. Because the sheet feed operation will not be performed in the middle of printing of such image, undesirable broken line or gap will not be formed on the printed image.

Method of forming image on roll of paper sheet

Printer for electronic computer

A printing system having a mechanism for fixing a large scale recording medium in a vertical orientation on an electrostatically adsorption plate provided on a base. The fixing mechanism includes a main holding unit provided on the base, a supplementary holding unit detachably fixed on the main holding unit, and a fixing unit for fixing the supplementary holding unit to the main fixing unit. The supplementary holding unit is first detached from the main fixing unit, and is placed on a tabletop. With this posture, a recording medium is fixed to the supplementary holding unit. Then, the supplementary holding unit holding the recording unit is fixed to the main holding unit. In the fixing operation, the fixing unit automatically changes a held fashion of the recording medium from by the supplementary holding unit to by the main holding unit.

Printing system with mechanism for attachingly supporting recording

A thermal printer wherein a sheet of recording paper is interposed between two drums provided on axially opposite sides of a shaft of a platen roll facing a line-type thermal head and an endless belt mounted on outer peripheries of the drum. One way clutches provided on a shaft of the drum will cause the paper to rotate together with the drums during recording and the recording paper is driven by the endless belt during paper feed and delivery operations to slide relative to the drums. The sheet of paper is fed to a lower portion of an open portion of the drums and is removed from an upper portion of the open portion of the drums so that the feed and delivery of the sheet of paper can be effected upon rotation of the drums in one direction, and the printing operation is started after a detection of a trailing end of the sheet of paper so that the printing operation can be reformed regardless of the length of the sheet of paper immediately after the feed of the sheet of paper.

Multicolor thermal printer recording medium transmission mechanism

Growing community of inventors

Hitachinaka, Japan

Hiroshi Takahagi