Hitachi, Ltd.

Hitachi Construction Machinery Co., Ltd.

Akihiko Yamamoto

Toshihiro Yamada

Akiomi Kohno

Eiichi Satoh

Kazutaka Suefuji

Kensaku Oguni

Yuji Yoshitomi

Masaki Koyama

Hirotaka Kameya

Shigekazu Nozawa

Tatsuo Natori

Katsumi Matsubara

Mitsuru Fujiwara

Muneo Mizumoto

Kazuaki Yokoi

Kotaro Naya

Keiji Taguchi

Youichi Murai

Tomoyuki Sato

Motohiro Satoo

Genroku Sugiyama

Takahiro Daikoku

Yoshishige Endo

Kazuaki Shiinoki

Koichi Sekiguchi

Koichi Inaba

Kouji Kimura

Susumu Hioki

Yoshiro Ibaraki

Toshimi Sasaki

Shinji Matsuoka

Hideo Nakae

Hiroyuki Kawamoto

Motohiro Satoh

Yutaka Satoh

Wataru Idetsu

Akiomi Kono

Hiroshi Mitsuyuki

Fumiuki Kobayashi

Motohiro Satou

Hideki Sasaki

Kazuaki Shinoki

Akiomi Kohono

Toshihiri Yamada

Yousuke Inatsu

Hardened surface layers ( ) and ( ) of a nitride or other compound, which is higher in hardness than dirt or soil, are formed on the inner peripheral surface ( B) of each metal bush ( ) and on the outer peripheral surface ( A) of each connecting pin ( ) which constitute a crawler belt ( ), respectively. In addition, resinous sliding bearings ( ) are fitted in transversely spaced positions on the inner periphery of each metal bush ( ) of the crawler belt. Bearing ( ) is provided with recessed grooves ( ). Accordingly, part of soil or dirt which intrudes into a gap space between an outer link portion ( ) of a track link and a metal bush ( ) through an annular seal member ( ) is trapped on an inner peripheral surface ( A) of the bearing ( ).

Crawler

A scroll type compressor comprises a stationary scroll and a rotary scroll which is assembled with the stationary scroll so as to define a closed space, the outer surface of the rotary scroll 22 is formed thereon with a tin compound film containing a tin compound and having a thickness of 50 .mu.m. Such a coating film is never peeled off from a member even after long time operation, and is excellent in sealability and conformability, in the displacement type compressor.

Displacement type compressor and method of forming coating film

An oil groove is provided in a space surrounded with the outer peripheral portion of an end plate of a revolving scroll, a stationary scroll and a frame on the inner surface of the frame, and lubricating oil attached to the inner surface of the frame by splashed with rotation of the balancing weight is reserved in the oil groove and then supplied to a key groove for sliding an Oldham-ring.

Scroll compressor with oiling mechanism

A screw-type rotary fluid machine such as a compressor or a vacuum pump has male and female rotors which rotate within a casing, with or without mutual contact. At least one of the male and female rotors being surface-treated to have a treated surface structure. The treated surface structure is a multi-layered structures composed of a plurality of layers including a non-electrolytic Ni plating layer and at least one covering layer of organic resin. The organic resin may be one or more kinds selected from a group of engineering plastics, so as to improve mechanical strength.

Screw-type rotary fluid machine including rotors having treated surfaces

A method treating a surface of rotors in a screw-type rotary fluid machine, with the method comprising the steps of: conducting a non-electrolytic Ni plating on the surface of each rotor so as to form a first layer of non-electrolytic Ni plating layer; heating the rotor having the first layer at a temperature not lower than 500.degree. C.; and forming, at least, a second layer of an organic resin so as to cover the first layer.

Method of treating surfaces of rotors of the screw type rotary machine

Both a test printing pattern during a forth direction printing and a test printing pattern during a back direction printing are displayed on a screen of a display apparatus. The test printing pattern is occurred at a predetermined detection position by counting a value of an up/down counter. A printing position drift between the forth direction printing and the back direction printing is shown on the screen. The optimum printing position drift having the smallest printing position drift amount is detected on the screen by the test printing patterns. A corrected result of the printing position drift is printed. A correction value of the printing position drift is renewed at an optimum value. The printing position drift in such as ruled lines is set at the minimum value. A high quality printing for a document data can be maintained and a high throughput for the document data can be obtained.

Method for correcting drift of printing position and printing apparatus

In a sealed structure consisting of ceramic members opposing each other and a frame coupled to the ceramic members and defining an He-tight chamber with the ceramic members, the melting point of a joint member for bonding one of the ceramic members to the frame is lower than the melting point of another joint member for bonding the other of the ceramic members to the frame so that rebonding can be made.

Sealed structure and production method thereof

This invention discloses a method of soldering together at least two members selected form metals and ceramics, which comprises successively jointing a high-melting jointing material, a medium-melting jointing material, and a low-melting jointing material, and a sealing structure prepared by this method. The method according to present invention enables the preparation of a sealing structure having a soldered area which is excellent in tightness.

Sealing structure, method of soldering and process for preparing sealing

A word processor is disclosed in which a central processing unit for editing a document on the basis of characters, rule line data and processing commands from a keyboard, has an automatic tabset function of setting a tab automatically in the column following a column where a ruled line is set, on the basis of the ruled line data.

Word processor provided with an automatic tabset means

A method of bonding alumina to a metal characterized in that an aluminum or aluminum-base alloy sheet is inserted between the alumina and the metal when they are bonded together by being heated and pressed, thereby obtaining a product which has a high reliability in strength at the joint and a high dimensional accuracy.

Method of bonding alumina to metal

The present invention relates to a method for bonding a non-oxide ceramic to a metal through an intermediate material comprising at least one member selected from metals of the Groups VIa and VIII of the Periodic Table. This method is suitably used for bonding of a structural part of a machine, an electronic part and the like.

Method for bonding ceramics to metals

Titanium alloy or cast titanium alloy is heat-treated in vacuum or a neutral atmosphere to convert the abnormal structure of the alloy to normal .alpha. or .alpha. + .beta. structure. The titanium alloy or cast titanium alloy thus heat-treated can have sufficiently good material characteristics by the ordinary successive heat treatments.

Method for heat treatment of titanium alloy

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Chiyoda, Japan

Akihiko Yamamoto