In a rod hole (19) of a holding rod (18) held in a guide hole (17) of a piston (10), a limit switch (20) is fixed and a detection rod (21) is inserted. A first engagement ball (30) and a second engagement ball (40) are configured to be in contact with a first cam surface (32) and a second cam surface (42), respectively, which are provided at an outer periphery of the detection rod (21). The first engagement ball (30) and the second engagement ball (40) are configured to be in contact with a first pushing portion (35) and a second pushing portion (45), respectively, which are provided inside the guide hole (17). The position of the piston (10) is detected by electrically or electronically detecting the movement of the detection rod (21) by the limit switch (20).

Provided is a machine tool which performs a cutting work on a workpiece, in which holes are provided at three or more points in a circumferential direction of a jig in the vicinity of a point at which the jig comes into contact with the workpiece when the workpiece is placed on the jig, and the workpiece is moved toward a rotation center of the jig by blowing air from an air supply unit toward the workpiece through the holes.

A number of variations may include a pin clamping device having a clamp hook connected to an actuator constructed and arranged to apply at least a downward force to the clamp hook and a biasing system constructed and arranged to apply an upward force to the clamp hook while a downward force is being applied to the clamp hook by the actuator.

A machining system configured to reduce spring back following machining operations comprising a machining tool and a spring back control system. The spring back control system comprises a number of force generators and a number of force loaded members coupled to the number of force generators, each force loaded member of the number of force loaded members comprising a material contact surface. The material contact surface is a roller, wherein the machining tool is independently moveable relative to the spring back control system.

The workpiece fastening device of the present invention comprises a table on which a workpiece is placed, an arm which can move so as to press a workpiece on the table against the table, and a drive part which drives the arm. The arm of the workpiece fastening device comprises a connection member which is connected to the drive part, and a rotary member which is attached to the connection member to be able to rotate about a rotation axis which extends in a direction intersecting with a movement direction of the arm. The rotary member of the arm has first and second pressing parts which are arranged at the opposite sides of the rotation axis and presses a workpiece on the table against the table by the first and second pressing parts.

A lathe chuck for aluminum alloy hubs, which includes a pull rod shaft, a positioning unit fixing seat, a protective cover and a hollow shaft sleeve, wherein the upper cover and the chuck body are connected together by screws, forming a chuck main body; a mounting hole is formed in the bottom of the chuck body, so that the chuck is mounted on a machine tool; the positioning pins are mounted between the upper cover and the chuck body by screws; the pull rod shaft, a annular pressing plate and a tensioning plate are connected together by screws; the tensioning plate and the positioning pins form sliding fit by copper sleeves, and the positioning unit fixing seat, the protective cover and the hollow shaft sleeve are arranged together by screws to form a combination; the spring, the sliding blocks and the cuneiform taper sleeve are mounted in the combination.

A rotation tool is mounted to a spindle of a machine tool. The rotation tool comprises a cutter holding portion to which blade portion is fixed and a fixing device which fixes a workpiece. The blade portion is disposed at a tip end of the cutter holding portion. The fixing device includes a movement portion formed to be movable in the interior of the cutter holding portion and a pressing device which presses the movement portion to a side toward the workpiece. The fixing device includes a shaft portion rotatably supported relative to the movement portion and a pressing portion which presses the workpiece.

A fixing device adapted to fix a flexible flat piece comprises a support platform adapted to support the flexible flat piece and a fixture adapted to clamp the flexible flat piece onto the support platform. The support platform includes a vacuum chamber formed therein having multiple vacuum suction holes formed in the top wall of the vacuum chamber. The vacuum suction holes are adapted to secure the flexible flat piece on the top surface of the support platform to prevent the flexible flat piece from being moved as it is clamped by the fixture.

A machining jig for rotatably supporting a workpiece comprising: a rotary drive part which rotates a seating part about a rotation axis, a clamp arm which has a rotary type clamp member which cooperates with the seating part to fasten a workpiece at a position separated from the seating part in a direction along the rotation axis of the seating part, a linear drive part which moves the clamp arm in a direction along a rotation axis, a position adjusting part which adjusts a position of the clamp arm in a plane intersecting the rotation axis, and a tilt adjusting part which adjusts a tilt of the clamp member so that a rotation axis of the clamp member becomes parallel with the rotation axis of the seating part.

A method for machining a workpiece which can prevent a reduction in machining accuracy and production efficiency. The method includes pressing a clamp part against a first portion of the workpiece, to clamp the workpiece in cooperation with a workpiece receiving part, causing the clamp part to move away from the first portion, to release the workpiece, which has been clamped by the clamp part, operating the robot to cause the robot hand to grasp a second portion of the workpiece, which is different from the first portion, to restrict the movement of the workpiece relative to the workpiece receiving part without a change in the posture of the workpiece, and operating the machine tool to machine the first portion while restricting the movement of the workpiece relative to the workpiece receiving part.