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Head useful in laser machine for focusing laser beam, comprises a device e.g. an optical lens for focusing beam, a unit for supplying pressurized gas, a nozzle with outlet opening, a pressure chamber, and a pressure compensation chamber
Head useful in laser machine for focusing laser beam, comprises a device e.g. an optical lens for focusing beam, a unit for supplying pressurized gas, a nozzle with outlet opening, a pressure chamber, and a pressure compensation chamber
The head useful in a laser machine for focusing laser beam, comprises a device (1) such as an optical lens for focusing beam, a unit for supplying pressurized gas, a nozzle (2) with outlet opening for laser beam and pressurized gas, a pressure chamber (4) between the focusing device and the nozzle, and a pressure compensation chamber (5) to balance a pneumatic force exerted by the pressurized gas on the nozzle. The nozzle is rotated with respect to the pressure chamber. The pressure chamber and the pressure compensation chamber are independent from one another, and fed with the gas. The head useful in a laser machine for focusing laser beam, comprises a device (1) such as an optical lens for focusing beam, a unit for supplying pressurized gas, a nozzle (2) with outlet opening for laser beam and pressurized gas, a pressure chamber (4) between the focusing device and the nozzle, and a pressure compensation chamber (5) to balance a pneumatic force exerted by the pressurized gas on the nozzle. The nozzle is rotated with respect to the pressure chamber. The pressure chamber and the pressure compensation chamber are independent from one another, and fed with the gas. The pressure compensation chamber has a variable internal volume. The gas supplying unit comprises a gas supplier that opens in the pressure chamber and/or the pressure compensation chamber. A motorized device comprising an electric motor is arranged to move the nozzle with respect to the pressure chamber and/or to the beam focusing device. Inner surface (6) of the pressure compensation chamber corresponds to an inner surface of an inner wall of the nozzle or an expansion of the inner wall of the movable nozzle. Inner surface (7) of the pressure chamber corresponds to a lower surface of the focusing device located opposite to the nozzle. Gas pressure is created on the internal surface of the pressure compensation chamber to oppose the pressure exerted on the lower surface of the focusing device along the pressure chamber to exert a pneumatic force on the nozzle towards the pressure chamber and/or focusing device. The inner surface of the pressure compensation chamber is approximately equal to the lower surface of the focusing device. A unit comprising sealing joints is arranged to ensure a pneumatic sealing between the pressure compensation chamber and the pressure chamber. An independent claim is included for a process for compensating the gaseous pressure exerted in the pressure chamber.
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