Kuroda Precision Industries Ltd.

Matsushita Electric Industrial Co., Ltd.

Tatsuo Tsuchiya

Kazuhiro Hozumi

Kenichi Sueyoshi

This invention relates to a chuck device with multistage degree of opening composed of an oscillating actuator acting as a driving part and an arm opening or closing mechanism installed at one end part to which an output shaft of the oscillating actuator is projected, the actuator having a plurality of oscillating vanes concentrically arranged within casings, the casing for an inner oscillating vane structure being rotatably supported in respect to the casing for an outer oscillating vane structure so as to form a rotary shaft and at the same time an oscillating vane of the outer oscillating structure is fixed to the rotary shaft. The output shaft is connected to the oscillating vane of the inner-most oscillating vane structure so as to enable its intermediate stopping to be attained, the arm opening or closing mechanism being comprised of a pair of guide rail blocks oppositely arranged in a spaced-apart relation at both sides of the output shaft while being crossed at a right angle with an extending direction of the output shaft and fixed to the end of the outer-most casing of the oscillating actuator.

Chuck device with multistage degree of opening

An air pressure shock absorber for smoothly stopping a moving object reciprocated by a rod in an air pressure cylinder. The shock absorber absorbs and reduces the internal pressure of a chamber in the cylinder to smoothly stop the moving object by the communication of air compressed in the chamber to the atmosphere through a bypass passage formed in a cylinder wall. The air pressure is released to the atmosphere after the piston has moved through a predetermined stroke.

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Asahi, Japan

Tatsuo Tsuchiya