Hitachi, Ltd.

Katsuaki Kikuchi

Yuzo Yamaguchi

Osami Matsushita

Masato Itagaki

Mikio Tokuyama

Yoshinori Takeuchi

Kazutaka Suefuji

Akira Murayama

Susumu Nakayama

Takao Senshu

Tetsuya Arata

Ryoichi Kaneko

Michiaki Ida

Masahiro Mase

Takashi Nagaoka

Seiji Tsuru

Shinichi Hirose

Kouki Shiohata

Tadashi Kaneki

Akira Nishiuchi

Yasuro Ohishi

Junji Okita

Eiji Maeda

Noboru Matsumura

Kazuo Sato

Shoji Suzuki

Aizo Kaneda

Shozo Nakamura

Norihide Saho

Shigeru Izumi

Masao Shiibayashi

Eiichi Hazaki

Naoshi Uchikawa

Noriaki Okamoto

Masakatsu Hayashi

Teruo Umehara

Takeo Nemoto

Hiroaki Kuno

Yoshihiko Miyake

Shinji Yamamoto

Masakazu Takasumi

Masahiro Yoshioka

Susumu Hioki

Shinichi Shimode

Yoshikatsu Tomita

Takashi Kohno

Seiji Sakagami

Ichiya Sato

Sigeaki Kuroda

Tuyosi Shudo

Masayuki Otsuka

Makoto Nagai

Masamichi Hanada

Motoji Ohmori

Takashi Kawakami

Yoshio Haeda

Hironori Etou

Kiyoshi Fukatsu

Motohiro Satoh

Noriaki Hagiwara

Yosio Haeda

Fumihiko Kitani

Taro Sonoda

Isamu Horiuchi

Yutaka Mori

Kimito Kasukabe

Yuji Tsujita

Kazuo Satoh

Masao Shibayashi

Minoru Tomono

Yasuyuki Kanai

Kimiaki Nakakado

Sadatsohi Minakawa

Koosaku Wakatsuki

Tohsuke Hirata

Shoi Suzuki

Kousaku Wakatasuki

Naoyoshi Yamago

A dry turbo vacuum pump has a multistage circumferential impeller supported on a shaft, and a stator which cooperates with it to form a multistage peripheral flow pump. A centrifugal pump arranged at an inlet side of the peripheral flow pump is also mounted on the same shaft, so that gas sucked from the inlet is discharged to the atmosphere from the peripheral flow pump. The multistage peripheral flow pump and at least one stage of the centrifugal pump are integrated.

Vacuum pump

Compressor bodies, an accelerator and a main motor are disposed on a base, while an innercooler, an aftercooler an oil cooler and a coolant cooler are disposed perpendicular to the axial direction of the motor so that the directions, in which the tube nests of the gas coolers are drawn out, are made to be the same. A control panel having a maintenance display is mounted on a front panel composed of panel portions which are mounted pivotally around respective remote or opposite side ends. Portions to be inspected daily are disposed near the front panel and one side panel adjacent thereto.

Package-type screw compressor

A turbo vacuum pump for compressing a low-pressure gas to discharge the compressed gas into atmosphere comprises pump stator having a gas flow passage comprising a plurality of annular flow passages on an inner surface thereof arranged stepwise diameters of which become smaller toward downstream and passages intercommunicating with adjacent annular flow passages and a gas discharge port communicated with one of the plurality of annular flow passages disposed at the most downstream. The pump stator includes a cylindrical spiral grooved pump impeller and a plurality of peripheral flow pump impellers facing the annular flow passages provided downstream of the cylindrical spiral grooved pump impeller and having stepwise diameters which become smaller toward downstream to form a peripheral flow pump stage. The suction casing has a spiral groove on a cylindrical inner surface thereof arranged with a predetermined clearance in relation to the spiral grooved pump impeller of the pump rotor so as to form a spiral grooved pump stage and a gas suction port communicated with the spiral grooved pump stage.

Turbo vacuum pump

Compressor bodies, an accelerator and a main motor are disposed on a base, while an intercooler, an aftercooler, an oil cooler and a coolant cooler are disposed perpendicular to the axial direction of the motor so that the directions, in which the tube nests of the gas coolers are drawn out, are made to be the same. A control panel having a maintenance display is mounted on a front panel composed of panel portions which are mounted pivotally around respective remote or opposite side ends. Portions to be inspected daily are disposed near the front panel and one side panel adjacent thereto. The compressor bodies including rotors that have been coated with a melted and solidified substantially homogeneous and continuous layer of a tetrafluoroethylene-perfluoroalkylvinylether copolymer that is substantially devoid of pinholes.

Package-type screw compressor having coated rotors

A flying head slider supporting mechanism comprises a rigid body disposed away from the surface of a magnetic recording medium by a predetermined distance, an air flow passage extending through the rigid body to the surface of the magnetic recording medium, a device for generating an air flow passing through the air flow passage toward the surface of the magnetic recording medium or generating an air flow passing from the surface, a read/write head for reproducing data recording on the magnetic recording medium or recording the same on the magnetic recording medium, a head slider disposed in the air flow and supporting the read/write head, a device for supporting the head slider movable relative to the rigid body in a direction perpendicular to the surface of the magnetic recording medium, and a device for generating a relative movement between the head slider and the magnetic recording medium.

Flying head slider supporting mechanism having active air pressure

A magnetic head device has a magnetic head slider by means of which information is recorded in and read from a magnetic recording medium. The magnetic head slider is supported by a supporting structure having an internal cavity, an opening formed in a portion of the structure where the magnetic head slider faces the magnetic recording medium and communicating with the internal cavity, and a gas passage through which the gas introduced into the internal cavity through the opening is discharged to the exterior of the internal cavity. With this arrangement, the pressure acting on the back surface of the magnetic head slider is adjusted to keep the slider afloat, while removing dust suspended in the gas around the recording medium and the supporting structure.

Magnetic disk device having an auto-loading mechanism and a dust

A nuclear magnetic resonance apparatus in accordance with the present invention includes ferro-magnetic field generation means and gradient field generation means and fixes the gradient field generation means at a predetermined position inside a cylindrical space by a support member. An elastic member is interposed between the support member and the gradient field generation means, and means for improving rigidity of the gradient field generation means, such as another support member and a fastening jig of the gradient field generation means, is disposed and fixed to the elastic member described above. In the manner image quality can be improved and noise can be reduced.

Nuclear magnetic resonance apparatus

This invention relates to a magnetic disk apparatus equipped with magnetic bearings for supporting a spindle without contact by a magnetic attracting or repulsing force. The magnetic disk apparatus prevents occurrence of oscillation of magnetic disks and accomplishes high accuracy positioning.

Magnetic disk apparatus

A compressor has stationary and orbiting scroll members formed thereon with spiral wraps engaged with each other to define compression chambers which, when the orbiting scroll member is moved relative to the stationary scroll member, are radially inwardly moved while decreasing their volumes. Each scroll member is composed of a metallic base scroll member having a spiral wrap formed on one side and a coating layer of a resin compound formed on the said side of the scroll member, including the surfaces of the wrap. The coating layer is molded by placing the base scroll member in a mold cavity with a space left between the said side of the base scroll member and a mold part and by injecting the resin compound into the space.

Fluid machine with resin-coated scroll members

A linear motor of moving-coil type is disclosed, in which a multi-phase moving coil includes a plurality of flat coil units each not wider than the longitudinal length of a permanent magnet making up a stationary part divided by the number of coil phases, the flat coil units being arranged successively in the same plane with central parts not adjacently overlaid one on the other. The central parts of the moving flat coil units have a thickness equivalent to a single phase in spite of the multiple phases of the moving coil. Thus a great electromagnetic force is generated, and at the same time a high propulsive force is obtained with the magnetic flux density not reduced in the gap accomodating one phase of coils alone.

Linear motor of moving-coil type

A sealed scroll compressor comprises a scroll compressor section, an electric motor, a sealed container, an oil storage, a fixed and orbiting scroll members, and a wire mesh member for improvement of oil separation in refrigerant gas. A shell portion of said sealed container is lined annularly with the wire mesh member and the gas containing oil is adapted to flow downwardly along the wire mesh member. When the gas flows downwardly, the oil sticks to the wire mesh member and is separated from the gas. The oil collected on the wire mesh member drops down into the oil storage. The gas from which the oil is separated is, after that, discharged out of the compressor.

Sealed type scroll compressor with wire mesh oil separating member

An oil feeding device for a scroll fluid apparatus. A fixed scroll member is associated with an orbiting scroll member. A crankshaft rotatably supported by a bearing of a frame has a crank portion engaging with a plain bearing of the orbiting scroll member. A variable speed driving motor is connected to the crankshaft. An oil feeding passageway is provided in the crankshaft and the crank portion. Oil is supplied to the plain bearing of the orbiting scroll member through a space at the end face of the crank portion. An oil flow passage is provided in parallel with the axis and in a surface of the crank portion located at a position advanced through approximately 45 degrees toward the rotational direction of the crank portion, from a position at which the load acting radially of the shaft due to the centrifugal force caused by the orbiting motion of the orbiting scroll member is applied to the crank portion of the shaft.

Oil feeding device for scroll fluid apparatus

In an electronic component mounting apparatus comprises a component feeding section including a feeding table unit loaded with several types of electronic components which feeding table unit is adapted to laterally reciprocate on a base, and stopping at a predetermined position thereby to feed the components continuously to a transfer mechanism, the transfer mechanism for absorbing the electronic components and mounting them on a board on an X-Y table on the other side, the X-Y table fixing and stopping the board to a predetermined position, and a board transport section for transporting the board onto the X-Y table for delivering the board having the electronic components mounted thereon, a component feeding apparatus wherein the component feeding table unit of the component feeding section is divided into a plurality of feeding tables each adapted to be moved individually on a straight line by a drive mechanism, the apparatus further comprising means for moving the table to a predetermined position in opposed relationship with the transfer mechanism in resonse to a command from the control unit.

Components feeding apparatus

A method and apparatus for monitoring cracks of a rotatable body by detecting cracks by measuring accoustic emission signals and evaluating the depth of cracks from the result of the comparison of assumed vibrations of the rotatable body and its measured vibrations. By this method and apparatus not only the beginning of cracking of the rotatable body, but also the progress of cracking on an online basis can be detected and monitored.

Method and apparatus for monitoring cracks of a rotatable body

An impeller of a centrifugal blower includes a hub, a hub plate, a plurality of blades and a shroud. The hub plate has an outer diameter which is smaller than an inner diameter of the shroud and a portion of the blades existing in the difference between the diameters is provided with a parting plane of molds, whereby the impeller can be integrally molded by the injection molding.

Impeller of centrifugal blower

Growing community of inventors

Tsuchiura, Japan

Katsuaki Kikuchi