A machine tool that attaches and detaches workpieces to and from a spindle in a shorter time includes: a machining mechanism part including a spindle, a tool rest, a first-axis feed mechanism moving the spindle in a a first axis extending along a center axis of the spindle, and a second-axis feed mechanism relatively moving the spindle and the tool rest in a second axis orthogonal to the first axis; a loading mechanism part including holding parts for holding a workpiece, and a third-axis feed mechanism moving the holding parts in a third axis orthogonal to the first axis to position them at the transfer position; and a numerical controller. The numerical controller operates to move the spindle toward the transfer position and to position the holding parts at the transfer position such that the operations at least partially overlap.

A workpiece supply device is provided that is capable of supplying a workpiece to be machined next in a supplying area of the workpiece outside a machining area while the machining area is closed to control scattering of cutting fluid from the machining area during the machining of the workpiece. A machine tool includes a machining room of the workpiece, a loader room, a dividing wall having an opening part, a main spindle, a workpiece supply device, a delivery device, and an ejection device. The workpiece supply device includes a workpiece holder, a movement mechanism, a cover member, and a coil spring. The coil spring biases the cover member to close the opening part by the cover member such that the workpiece holder holds the workpiece in the loader room during the machining of the workpiece in the machining room.

The method includes a preprocessing transfer step which places an unprocessed rod-like body in a receiving position; a post-processing transfer step which pushes a processed rod-like body with the unprocessed rod-like body, and thus transfers the processed rod-like body to a rail portion; a rail portion transfer step which pushes the processed rod-like body with the unprocessed rod-like body, and thus transfers the processed rod-like body while being guided by the rail portion; a withdrawing step which withdraws the processed rod-like body from the rail portion using a withdrawing unit; a detection step which detects that the processed rod-like body is transferred from the rail portion to the withdrawing unit; and a discharge step which discharges the processed rod-like body from the withdrawing unit in a direction perpendicular to an axis of the processed rod-like body.

There is provided a robot for machine tool which can work with a large power and torque when necessary while not attaching a large-size motor to the robot and while having a thin arm, as well as a machine tool having the robot. An in-machine robot of a machine tool includes an input shaft, a transfer shaft, a bevel gear, and an end effector. The input shaft is connected to a tool of the machine tool, and a driving force of the tool is transferred to the end effector. The end effector is a hand or the like, and a workpiece is gripped or rotated with the hand using the driving force of the tool. A plurality of the input shafts are provided, and a suitable input shaft is connected to the tool as appropriate.

A precision machining/measurement device and a robot that conveys a workpiece to the device are covered by a cover, and a space covered by the cover is partitioned by a partition cover into a space where the precision machining/measurement device is installed and a space where the robot is installed. When a temperature inside the space where the robot is installed falls within a predetermined temperature range, a door provided in the partition cover is opened, and the robot supplies the workpiece to the precision machining/measurement device through the opened door.

A workpiece discharge device for a machine tool is provided with a container, which is mounted on a turret and receives a workpiece held by a spindle from a receiving port, and a storage box, which stores the workpiece inside the container by using a revolution of the turret and passing through a chute. The container is mounted on the turret and is capable of swinging around a swinging shaft which is parallel to a revolving axis of the turret, and the receiving port is arranged to direct vertically upward in a predetermined indexing angle range of the container when the workpiece is received.

A machine tool system includes a machine tool including a processor to process a workpiece with a tool, and a bed on which the processor is mounted, a transport apparatus including two, left and right, legs spaced apart from the bed to transport the workpiece and feed the workpiece to the processor or discharge the workpiece from the processor, and a plate that connects the bed to the legs and is elastically deformable. The plate is upright such that a plate surface is aligned with a front-rear direction, and a connection portion of the plate that connects with the bed and a connection portion of the plate that connects with the legs are displaced in a front-back direction.