Patent ID: 7182720

Claim:
A machine tool comprising: a support table provided on an upper surface of a bed to support a work; a Z-axis saddle for reciprocation in a longitudinal Z-axis direction; a machining unit mounted on the Z-axis saddle and provided with a machining head for machining of the work; a compartment cover arranged on the bed to compartment a machining region, in which the work supported on the support table is machined, and a machine region, in which the machining unit is movably arranged; an opening window provided on the compartment cover to permit the machining head to go in and out of the machining region therethrough; and a seal member in the form of a closed ring to be mounted on an inner peripheral edge of the opening window of the compartment cover; wherein an entire periphery of an outer peripheral surface of the machining head is brought into sliding contact with an inner peripheral edge of the seal member in a state, in which the machining head is moved into the machining region from a tool exchange position within the machine region.