Hitachi Koki Co., Ltd.

Hitachi Printing Solutions, Ltd.

Yasuo Takano

Yoshitaka Akiyama

Nobuhiro Noto

Norimasa Kondo

Nobuhiro Kurosawa

Takuji Torii

Kenichi Kugai

Shigenori Suematsu

Yutaka Shoji

Atsushi Kakuta

Junji Kobayashi

Kensei Hosoya

Hiroyoshi Tokoro

Masato Yamada

Kazuo Sugano

Masatoshi Sakata

Takao Matsuoka

Toshimitsu Harada

Kazuaki Akimoto

Shogo Nobumori

Kazuo Sakaki

Tatsuo Matsuda

Keiji Watanabe

Takuji Toru

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

During a method for manufacturing an ink-jet print head, piezoelectric element bars are fixed to a base plate. Then, two corners of the piezoelectric element bars are cut. The bare are then diced to be separated into individual piezoelectric elements.

Method of manufacturing ink jet print head

A solid-ink printing original plate which comprises a substrate and an image comprising ink dots formed on the substrate, and which is produced by a process comprising the steps of: melting a solid ink that is a solid at a room temperature; and jetting the melt of the solid ink onto a substrate to form ink dots, wherein the solid ink has a penetration index of not more than 5 at a room temperature. Also disclosed is a process for producing the solid-ink printing original plate.

Solid-ink printing original plate and a process for producing the same

An on-demand ink jet head includes a plurality of piezoelectric elements in alignment with one another with one end of each facing in the same direction. The end of each piezoelectric element is bonded by an adhesive material to a diaphragm which, together with a nozzle plate, forms a pressurizing chamber. To confine the fluid state adhesive material expelled out of the endmost piezoelectric elements, a dummy piezoelectric element is disposed outside each endmost piezoelectric element. The adhesive material, when dried, serves as a damper of the piezoelectric element for damping unwanted vibrations of the piezoelectric elements. By the provision of the dummy piezoelectric elements, the distribution of the adhesive material becomes substantially even between the piezoelectric elements, resulting in uniform operations of the piezoelectric elements.

Multi-nozzle ink jet head with dummy piezoelectric elements at both ends of a piezoelectric element array for controlling the flow of adhesive about the piezoelectric element array

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

A paper conveying apparatus which facilitates increased printing speed in a printer, such as a laser printer, by providing rollers which are rotated at different respective speeds at different times during a paper feeding and image transfer operation, so as to provide even feeding of the paper to an image transfer device. The paper is fed, one sheet at a time, relatively rapidly to the image transfer device, and at a slower speed, in synchronism with the image transfer operation, while transfer is being effected.

Paper conveying device having variable speed rollers for a printing

In an electrophotographic developing device, its doctor blade disposed adjacent to a magnetic roll so as to control the thickness of a layer of magnetic developing agent conveyed by the magnetic roll has an edge which is curved in such a manner that the gap between the edge and the magnetic roll is a minimum in the vicinity of the middle of the magnetic roll, whereby the layer of magnetic developing agent is made uniform in thickness and the printing density is made uniform despite gravitational sagging of the roll.

Electrophotographic developing device having a shaped doctor board

Growing community of inventors

Hitachinaka, Japan

Yasuo Takano