Abstract: A machine tool includes a machine bed, a processing machine mounted on the machine bed to perform mechanical processing on a workpiece, a covering unit configured to enclose a processing station, and a shroud support member configured to support the covering unit in a non-contact relation with the machine bed. The machine tool also includes a loader configured to travel along a rail while holding the workpiece, and configured to selectively load and unload the workpiece relative to the processing machine.

Abstract: A coupling device includes axially opposed first and second members that are axially moved relative to each other to couple or decouple the first and second members with or from each other. First and second circular rows of teeth arranged to position the first and second members in a circumferential direction upon their engagement are coaxially provided on respective mating surfaces of the first and second members. Also, contact areas are arranged on the mating surfaces of the first and second members, respectively, to position the first and second members in an axial direction when axially opposed, respective contact surfaces are brought into contact with each other while the first and second circular rows of the teeth are engaged with each other.

Abstract: An object of the present invention is to provide a machine tool with a spindle chuck replacing function which has a simple configuration and enables a reduction in work replacement time. The machine tool with the spindle chuck replacing function includes a spindle 3, a spindle motor 4, a plurality of spindle chucks 5, 5, a spindle chuck replacing mechanism 10, a pre-rotation motor 7, a rotation speed sensing arrangement, and a replacement spindle motor speed control device. The replacement spindle motor speed control device controls the rotation speed of the spindle motor 4 according to a speed sensed by the rotation speed sensing arrangement so that when the spindle chuck replacing mechanism 10 passes the spindle chuck located at a spindle opposite position P1 to a chuck coupling portion 3a of the spindle 3, the rotation speed of the spindle 3 synchronizes with the rotation speed of the spindle chuck 5 located at the spindle opposite position P1.

Abstract: An object of the present invention is to provide a machine tool with a spindle chuck replacing function which has a simple configuration and enables a reduction in work replacement time. The machine tool with the spindle chuck replacing function includes a spindle 3, a spindle motor 4, a plurality of spindle chucks 5, 5, a spindle chuck replacing mechanism 10, a pre-rotation motor 7, a rotation speed sensing means, and a replacement spindle motor speed control means. The replacement spindle motor speed control means controls the rotation speed of the spindle motor 4 according to a speed sensed by the rotation speed sensing means so that when the spindle chuck replacing mechanism 10 passes the spindle chuck located at a spindle opposite position P1 to a chuck coupling portion 3a of the spindle 3, the rotation speed of the spindle 3 synchronizes with the rotation speed of the spindle chuck 5 located at the spindle opposite position P1.