Abstract: A door device includes a door slidable between a first position and a second position; an air cylinder having a first air chamber to which air is supplied to apply a first assist force to the door in a first direction from the first position toward the second position; a fluid passage connecting the first air chamber and an air supply source; a switch valve provided at the fluid passage; and a manipulation switch to switch the switch valve between a first state and a second state. The door, in the first state, is movable in the first direction and a second direction opposite to the first direction without the first assist force. The first assist force is applied to the door in the second state. The door at the first position closes an opening a machine tool. The door at the second position fully opens the opening.

Abstract: A jaw exchanger includes a stocker configured to store jaws which are configured to be attached to a chuck body of a machine tool, a stocker movement mechanism configured to move the stocker between a first position and a second position, and a jaw transferor configured to transfer the jaws to the stocker positioned at the first position from a jaw receiver to receive the jaws, and configured to transfer the jaws to the chuck body from the stocker positioned at the second position. The chuck body is rotatable about a rotation axis.

Abstract: A door device includes a door slidable between a first position and a second position; an air cylinder having a first air chamber to which air is supplied to apply a first assist force to the door in a first direction from the first position toward the second position; a fluid passage connecting the first air chamber and an air supply source; a switch valve provided at the fluid passage; and a manipulation switch to switch the switch valve between a first state and a second state. The door, in the first state, is movable in the first direction and a second direction opposite to the first direction without the first assist force. The first assist force is applied to the door in the second state. The door at the first position closes an opening a machine tool. The door at the second position fully opens the opening.

Abstract: A jaw exchanger includes a stocker configured to store jaws which are configured to be attached to a chuck body of a machine tool, a stocker movement mechanism configured to move the stocker between a first position and a second position, and a jaw transferor configured to transfer the jaws to the stocker positioned at the first position from a jaw receiver to receive the jaws, and configured to transfer the jaws to the chuck body from the stocker positioned at the second position. The chuck body is rotatable about a rotation axis.

Abstract: A tool storage includes a tool receiver, a tool magazine, and a tool carriage. The tool receiver is provided on a one side of a machine tool with respect to a workpiece holder of the machine tool along a machine tool direction and is configured to receive a tool from an outside of the machine tool. The tool magazine is provided on another side opposite to the one side with respect to the workpiece holder along the machine tool direction. The tool carriage is configured to carry the tool between the tool receiver and the tool magazine.

Abstract: The invention provides a machining center having a first main spindle unit and also a second main spindle unit with a ram shaft attached to a vertical machining center. A machining center 1 comprises a rotary table 20 that moves in the direction of an X-axis on a bed 10, and a cross rail 40 supported by a column 30 and moving in the direction of a Z-axis. A first main spindle unit 60 is attached to a saddle 50 supported by the cross rail and moving in the direction of a Y-axis. The first main spindle unit 60 is equipped with a first main spindle 70 that rotates around a B-axis. A second main spindle unit 100 disposed between the first main spindle unit 60 and the saddle 50 is equipped with a ram shaft 110 that moves in the direction of a W-axis and a turning head or a milling head that is replaceably attached to the leading end of the ram shaft.

Abstract: The invention provides a machining center having a first main spindle unit and also a second main spindle unit with a ram shaft attached to a vertical machining center. A machining center 1 comprises a rotary table 20 that moves in the direction of an X-axis on a bed 10, and a cross rail 40 supported by a column 30 and moving in the direction of a Z-axis. A first main spindle unit 60 is attached to a saddle 50 supported by the cross rail and moving in the direction of a Y-axis. The first main spindle unit 60 is equipped with a first main spindle 70 that rotates around a B-axis. A second main spindle unit 100 disposed between the first main spindle unit 60 and the saddle 50 is equipped with a ram shaft 110 that moves in the direction of a W-axis and a turning head or a milling head that is replaceably attached to the leading end of the ram shaft.