Abstract: A switching device shuts down a machine installation in failsafe fashion. The switching device includes an input for a defined input signal, a first output providing a first current path to the machine installation, a display element capable of assuming first and second states, and a processor having first and second modes of operation. The first current path includes a switching element capable of assuming closed and open operating states. In the first mode, the processor controls the switching element in response to the defined input signal in order to selectively close or interrupt the first current path. In the second mode, the processor controls the switching element into the open operating state regardless of the defined input signal. In the first mode, the display element assumes the first and second display states in response to the switching element being in the closed and open operating states, respectively.

Abstract: A laser processing machine has a processing area and a laser processing device. A workpiece can be processed by the laser processing device at a processing location via emission of laser radiation to generate a processing product. An environment of the processing area is shielded against the laser radiation by a protective housing. The processing product can be moved in a discharge direction to pass a boundary of the protective housing that is flexible in the discharge direction. A product rest, arranged below the processing location in the vertical direction and extending in the discharge direction, functions to store the processing product. In the vertical direction below the processing location, the protective housing extends in the discharge direction, forming an extension with which the protective housing extends over the product rest. The boundary limits the extension in the discharge direction and is arranged above the product rest.

Abstract: A switching device for switching on and/or switching off an electrical load has an input section for receiving a defined input signal, an output section having an output switching element that provides a current path to the electrical load, and a control section that can be operated in a first active mode of operation or in a second active mode of operation. The control section actuates the output switching element on the basis of the defined input signal in order to close or interrupt the current path. A display element assumes a first display state when the control section is in the first active mode of operation and the output switching element is in the closed operating state. The display element assumes an alternative second display state when the control section is in the first active mode of operation and the output switching element is in the open operating state. The control section interrupts the current path regardless of the defined input signal in the second active mode of operation.

Abstract: A laser processing machine has a processing area and a laser processing device. A workpiece can be processed by the laser processing device at a processing location via emission of laser radiation to generate a processing product. An environment of the processing area is shielded against the laser radiation by a protective housing. The processing product can be moved in a discharge direction to pass a boundary of the protective housing that is flexible in the discharge direction. A product rest, arranged below the processing location in the vertical direction and extending in the discharge direction, functions to store the processing product. In the vertical direction below the processing location, the protective housing extends in the discharge direction, forming an extension with which the protective housing extends over the product rest. The boundary limits the extension in the discharge direction and is arranged above the product rest.

Abstract: The present invention relates to a process for the production of methacrylic acid and methacrolein by means of gas phase oxidation of isobutane in the gaseous phase at 250.degree. to 450.degree. C. on molybdenum heteropoly acid catalysts that are made up of CU.sub.a H.sub.b P.sub.c Mo.sub.d V.sub.e O.sub.f heteropoly acid compounds (I), where a=0.1 to 1, b=0 to 7.8, c=0.8 to 1.2, d=9 to 12, e=0.5 to 3, and f depends on the molar numbers a to e, and/or the heteropoly acid H.sub.8 PMo.sub.10 VO.sub.39 (II) or its anhydride PMo.sub.10 VO.sub.35 (III).

Abstract: Method for making catalysts for gas phase oxidation reactions by admixing a catalytically active material comprising oxides of molybdenum, phosphorus, and vanadium with combustible natural or synthetic fibers, or with carbon fibers, forming shaped bodies from the mixture, and then calcining said shaped bodies at 100.degree. C. to 380.degree. C. in oxygen, whereby said fibers are burned out to leave channels in said shaped bodies; catalysts made by such methods; and methods for gas phase oxidation reactions using such catalysts.