Hitachi Koki Co., Ltd.

Hitachi Printing Solutions, Ltd.

Norimasa Kondo

Yasuo Takano

Takuji Torii

Takao Matsuoka

Kazunobu Hayashi

Masayuki Ainoya

Shigenori Suematsu

Nobuhiro Noto

Yoshitaka Akiyama

Nobuhiro Kurosawa

Kazuo Sugano

Shuichi Morio

Shinya Tomita

An ink jet print head includes a laminated piezoelectric element The piezoelectric element is fixedly attached to electrodes by electrically conductive adhesive A flexible printed cable is electrically connected to electrodes by soldering. The stationary plate is formed with through holes which are filled with an electrically conductive filler The filler and the electrodes are formed of tungsten, and the electrodes are plated with gold.

Configuration of ink jet print head capable of reliably maintaining its continuity

A nozzle wiping apparatus comprises an ink-absorbent sheet placed below the ink discard hole to collect the sucked ink discarded through the ink discard hole and an ink absorbent sheet winding mechanism to wind up the ink-absorbent sheet. The ink-absorbent sheet is kept in contact with a part of the nozzles after completion of the purging operation so the nozzles may be moved relative to the ink-absorbent sheet to thereby wipe ink deposited on the nozzles.

Ink purge apparatus, ink purging method nozzle wiping apparatus and wiping method in printer

An on-demand multi-nozzle ink jet head includes a diaphragm and a plurality of piezoelectric stacks. The diaphragm forms at least one wall of a pressurizing chamber used to increase the pressure of the ink. When print signals are applied to the piezoelectric stacks. The stacks generate pressure fluctuations in the walls of the pressurizing chamber. An elastic material with adhesive properties is used to bond the diaphragm to the piezoelectric stacks, which elastic material has a Shore hardness of less than 80 on the A scale and less than 30 on the D scale.

On-demand multi-nozzle ink jet head

An ink jet printer having bubble purging arrangement for discharging bubbles mixed in the ink out of a print head. The print head has a main tank for storing ink, a sub tank for collecting and storing ink, and a manifold fluidly connecting the main tank and the sub tank. The manifold is in fluid communication with the nozzles for supplying ink from the main tank to the nozzles. Three kind of purging modes are provided in accordance with purging position of the print head. Pressurizing pump is selectively connected to the main tank or sub tank or both main tank and the sub tank through a valve arrangement. If the pump is fluidly connected to the main tank only, the ink in the main flows into the sub tank. If the pump is fluidly connected to the sub tank only, the ink in the sub tank flows back into the main tank. By alternating the fluid connection, bubbles mixed in the ink is gradually concentrated at an upper portion of the manifold. If the pump is fluidly connected to both the main tank and the sub tank, the concentrated bubbles is positively discharged outside through the nozzles.

Ink jet printer having bubble purge mechanism

A suction purging unit for removing dusts solidified ink etc. from nozzles of a print head of an ink jet printer, the nozzles being arrayed in a moving direction of the print head. A contact portion is provided at one side of a body portion in which a fluid passage is formed. The contact portion is contactable with at least one of the nozzles for suction purging, and is separated from the nozzle between-suction purging mode. The body portion is pivotally movable toward and away from the print head, and is vertically movable. The body portion is movable along a top surface of the print head when the latter is moved in the moving direction.

Suction-purging unit and suction purging method for an ink jet printer

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Hitachinaka, Japan

Norimasa Kondo