Citizen Watch Company, Ltd.

Hisao Yoshikawa

Sosaku Kimura

Kazuo Shiba

Shigehiro Fuwa

Fumio Maeno

Masami Shimizu

Kuniyuki Mihara

Hisao Wakabayashi

Toshihiko Nakayama

Hiroshi Hishida

Isao Koyama

A grinding machine comprising a tool mounting head which is movable vertically between a pair of guide columns on which guide surfaces are provided for guiding the head. A plurality of workpieces are mounted on corresponding holding jigs which are mounted by means enabling them to be tilted, and measurement means such as X-ray or optical means are provided to sense the orientation of a workpiece being machined, with signals from the measurement means controlling the tilting of the corresponding holding jig. Jigs are mounted on a rotary table rotatably mounted on a workpiece slide which can be traversed below a grinding tool.

Grinding machine

A machine tool elevating and guiding apparatus comprising a tool mounting head which is movable vertically between a pair of guide columns. Guide surfaces on the guide columns are positioned closely adjacent to guided surfaces on the tool mounting head and a flow of pressurized fluid is passed at a fixed pressure between the guide and guided surfaces, such as to eliminate tilting of the tool mounting head. At least one guide surface serves as a reference surface, with a thin film of pressurized lubricating oil being formed between this and an adacent guided surface. The tool mounting head is mounted on an elevating feed screw, with means provided whereby the weight of the head is supported independently of that screw, so that a very high degree of precision in vertical positioning of the tool mounting head is attained.

Machine tool elevating and guiding apparatus

The invention relates to a support structure for a thickness-shear mode, convex lens type oscillator. The support structure contains an elastic ring made from an insulating material such as nylon. This ring is formed with a plurality of spaced, radially inwardly and integrally extending projections from the ring proper and said projections represent concentric recesses of opposite configurations one after another adapted for establishing pressure contact with the quartz crystal at their opposite surfaces and at different peripheral areas thereof.

Supporting structure for a thickness-shear type quartz oscillator

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Tokorozawa, Japan

Hisao Yoshikawa