Provided is a machine tool hand including a body portion that is mounted so as to be attachable to and detachable from a spindle of a machine tool, and that is provided with a flow path connected to a coolant-liquid supply path formed in the spindle; and two or more hand members that are attached to the body portion such that at least one of the hand members is pivotable about a prescribed axis, and that are capable of gripping an object therebetween by being closed. The flow path is provided with discharge ports via which a coolant liquid supplied from the coolant-liquid supply path is discharged toward surfaces of the hand members that are exposed to an outside, and a pressure of the coolant liquid causes an opening operation or a closing operation of the hand members.

A workpiece supply-and-discharge device includes a fixed portion, and a swivel portion that swivels on a bed. The fixed portion is provided with a plurality of fixed rails having an arc shape and separated from each other. Movable rails enter or exit from gaps left between the fixed rails as reciprocating actuators operate. Workpiece gripping portions configured to grip a workpiece are provided with sliders. When the workpiece gripping portions carry the workpieces while swiveling integrally with the swivel portion, the sliders transfer from the movable rails to the fixed rails or from the fixed rails to the movable rails.

A machine tool includes a headstock that holds a workpiece, a tool post that is movable in a first axis direction parallel to a workpiece rotation axis and in a second axis direction orthogonal to the first axis and holds a tool, an in-machine robot, an opening for communicating the inside and the outside of a working chamber, and a door that opens and closes the opening. The robot includes a root joint fixed in the working chamber and a link unit positioned on a distal end side of the root joint. The root joint is a linear-motion joint extendable in a direction orthogonal to the workpiece rotation axis, and is a linear-motion joint extendable between the length for causing the entire link unit to be positioned inside the working chamber and the length for causing the entire link unit to be positioned outside the working chamber.

A workpiece supply-and-discharge device includes a fixed portion, and a swivel portion that swivels on a bed. The fixed portion is provided with a plurality of fixed rails having an arc shape and separated from each other. Movable rails enter or exit from gaps left between the fixed rails as reciprocating actuators operate. Workpiece gripping portions configured to grip a workpiece are provided with sliders. When the workpiece gripping portions carry the workpieces while swiveling integrally with the swivel portion, the sliders transfer from the movable rails to the fixed rails or from the fixed rails to the movable rails.

A workpiece holding device includes: a chuck including a chuck body, and a plurality of chuck claws openably supported on the chuck body and configured to hold a workpiece; an operation rod configured to drive the plurality of chuck claws for opening and closing with movement of the operation rod; and a measuring apparatus configured to measure an opening dimension of the plurality of chuck claws based on a movement amount of the operation rod.

A drive mechanism of a transfer tool configured to drive a swing axis and tilts the workpiece includes: a motor; a speed reducer including an output shaft arranged in parallel to the swing axis and configured to reduce speed of rotation of the motor; and a link mechanism configured to couple the swing axis with the output shaft, in which the link mechanism includes a first link portion fixed to the output shaft at a middle portion in a length direction thereof; a second link portion fixed to the swing axis at a middle portion in a length direction thereof; a third link portion that couples one end portions of the first link portion and the second link portion with each other in a rotatable manner; and a fourth link portion that couples other end portions of the first link portion and the second link portion with each other in a rotatable manner, in which the first link portion and the second link portion are arranged in parallel to each other, and in which the third link portion and the fourth link portion are arranged in parallel to a line segment linking a central axis of the output shaft with a central axis of the swing axis.

A gripping device includes carriages or pivot arms carrying gripping elements. The carriages or pivot arms are mounted and guided in a base body and are drivable by at least one cylinder-piston unit. A switching module is mounted on the base body. The switching module includes at least one pressure medium connection and at least one electrical connection. At least one electrically controllable valve, which is switching a pressure medium, and at least one electronic controller for implementing external and internal control signals are arranged in the control module. The internal control signals originate from at least one sensor which detects at least one physical characteristic variable of the carriage(s) and/or the cylinder-piston unit at least in or on the base body. The gripping device can be adapted to at least one machine control system with a minimum interconnection and programming effort.

A workpiece transferring tool including a base mounted on a distal end of a wrist of a robot, a workpiece holder releasably holding a workpiece, and a movable connection unit connecting the workpiece holder to the base so that the workpiece holder is displaceable in an escape direction of an external force acting on the workpiece. This can prevent an excessively large external force from acting on the robot due to the workpiece and can prevent frequent accidental stop of the robot.

Provided is a machine tool hand including a body portion that is mounted so as to be attachable to and detachable from a spindle of a machine tool, and that is provided with a flow path connected to a coolant-liquid supply path formed in the spindle; and two or more hand members that are attached to the body portion such that at least one of the hand members is pivotable about a prescribed axis, and that are capable of gripping an object therebetween by being closed. The flow path is provided with discharge ports via which a coolant liquid supplied from the coolant-liquid supply path is discharged toward surfaces of the hand members that are exposed to an outside, and a pressure of the coolant liquid causes an opening operation or a closing operation of the hand members.

Provided is a machine tool hand including a body portion that is mounted so as to be attachable to and detachable from a spindle of a machine tool, and that is provided with a flow path connected to a coolant-liquid supply path formed in the spindle; and two or more hand members that are attached to the body portion such that at least one of the hand members is pivotable about a prescribed axis, and that are capable of gripping an object therebetween by being closed. The flow path is provided with discharge ports via which a coolant liquid supplied from the coolant-liquid supply path is discharged toward surfaces of the hand members that are exposed to an outside, and a pressure of the coolant liquid causes an opening operation or a closing operation of the hand members.