Patent ID: 8601906
Filing Date: 2013-12-10
Classification: B23Q,Y10T

Abstract:
1. A machine tool comprising: a machine body for machining a workpiece; a machine body cover surrounding a periphery of said machine body; a machining-area opening formed in said machine body cover and opening a machining area of said machine body; and a door device opening and closing said machining-area opening, wherein said door device includes a first door to cover said machining-area opening when machining the workpiece and a second door disposed on an outer side of the first door and said second door being capable of covering said machining-area opening when not machining the workpiece, the second door being formed so as to allow observation of the machining area, wherein the first door and the second door have respective substantially vertical wall portions, the vertical wall portions being arranged to overlap when viewed from a side of said machine body, wherein the vertical wall portion of the second door includes a window portion larger than a window portion of the first door, wherein the first door and the second door are arranged so as to be movable between a position-in-use where each of the first and second doors is covering said machining-area opening and a position when opened opening said machining-area opening, and wherein during the machining, said machining-area opening is covered by the first door or by the first door and the second door, and during non-machining and during low-speed-rotation machining, said machining-area opening is covered only by the second door.