Abstract: An inertial force applied to a motor drive shaft when jaw members stop at opening and closing ends, grasping positions of a workpiece, and the like is absorbed and damage to motor parts such as gears due to impact is prevented.

Abstract: In an electric hand, a cam member 12 mounted to a drive shaft 3a of an electric motor 3 is provided with a pair of cam grooves 15 and 15, a pair of jaw members 2 and 2 for grasping a workpiece are provided with drive pins 13 fitted to the cam grooves 15 and 15, and a normal or reverse rotation motion of the drive shaft 3a is converted into an opening or closing motion of the jaw members 2 and 2 by the cam member 12 and the drive pins 13. A torque limiter 6 having a friction plate 19 for connecting by a frictional force the drive shaft 3a of the electric motor 3 and the cam member 12 is provided between the drive shaft 3a and the cam member 12, and a torque of the drive shaft 3a transmitted to the cam member 12 is limited by this torque limiter 6.

Abstract: A circular piston and a noncircular rod are separately formed as separate parts and the piston and the rod are integrally connected to each other through an adhesive in a state in which the piston is aligned to be concentric with a circular bearing hole of a first air bearing and the rod is aligned to be concentric with a noncircular bearing hole of a second air bearing.

Abstract: A two-drive-system fluid pressure chuck including two sets of jaw members capable of chucking a workpiece from two directions X and Y. The chuck includes two cylinder apparatuses, a first rod, a second rod, and a cam member. The first rod being slidably disposed within the inside of the second rod. The cam member is formed at the tip of each rod and is used to convert the reciprocal operation of each rod into the opening and closing operations of the jaw members. A notch is formed in the side of the second rod, and the cam member of the first rod protrudes out from the second rod through this notch to connect to the jaw member.

Abstract: In a slide actuator, a central guide rail having V-shaped grooves defined therein and opened at 90 degree angles, is mounted on a cylinder body. A slide table is brought into engagement with the guide rail. Guide members having V-shaped grooves defined therein are provided inside the slide table so that they are opposed to the grooves defined in the guide rail. Cylindrical roller bearings are alternately fitted at inclinations of 90.degree. in their corresponding channels defined by the opposed grooves. Thus, when the roller bearings are rolled, the slide table is displaced with higher accuracy and a load supported by the slide table is transmitted to the guide rail from the roller bearings.