US Patent 7326878 Laser beam processing machine

A laser beam processing machine includes a dust discharger which includes a first cover member mounted to the lower end of the condenser and a first opening for letting a laser beam applied from the condenser pass therethrough in the bottom wall, a second cover member which is arranged to surround the first cover member and has a second opening for allowing a laser beam applied from a condenser pass therethrough and sucking in dust in the bottom wall, an air introduction chamber which is formed between the first cover member and the condenser and communicates with the first opening, a dust collection chamber which is formed between the first cover member and the second cover member and communicates with the second opening, a first air supplier for supplying air to the air introduction chamber, and a swirling flow generator for generating a swirling flow in the dust collection chamber.