Koehler, U.U.Koehler2022-03-082022-03-081990https://publica.fraunhofer.de/handle/publica/302444Device (18) for processing workpieces (11) using laser radiation (12), with a gas jet (14) connected to a gas reservoir (16) via a controllable outlet valve (15) directed at a processing point (13). To generate a gas flow which can be changed quickly at the processing point, the device is designed such that the gas reservoir (16) has a fully enclosed flow channel (1) fitted with a gas inlet valve (4) - gas (17) is rapidly circulated by a drive in a flow channel - and such that the outlet valve (15) features a controlled valve organ (7, 8) which diverts a portion of the flowing gas (17).de608621patent1989-3927451