STACK GAS APPARATUS IN THERMAL CUTTING MACHINE

PROBLEM TO BE SOLVED: To surely discharge gas when a material to be cut having a small width dimension is placed on a surface plate though an opening part is formed to an upper part of the surface plate in conducting thermal cutting of plasma cutting, laser beam cutting or gas cutting, etc. SOLUTION: A stack gas apparatus of a thermal cutting machine is constituted of a rail 1 laid in parallel, the surface plate C, which is constituted of arraying plural spanning plates in parallel in the direction orthogonal to a laying direction of the rail 1 and places the material to be cut B on its upper part, a cutting machine A, which has a frame 3 placed on the rail as freely running and mounts a cutting torch 2 to the frame 3 as freely traversing, a sucking member 12, which is arranged in a traversing direction of the cutting torch 2 mounted on the frame 3 of the cutting machine A and is opened toward a space between the spanning plates 5, and an injection nozzle 11, which is arranged to the suction member 12 as facing on interposing the cutting torch 2, is mounted to the carrier 8 arranged to be freely traversed to the frame 3 and injects a fluid to the space formed with the spanning plates 5 and the material B to be cut placed on the spanning plates 5.