Safety device for machine tools, in particular for a sliding table saw and / or an edge banding machine, with a processing tool which is used to process a workpiece supplied to the machine tool, comprising: a detection device which is designed to detect a hazardous situation for an operator of the machine tool, a risk reduction device, which is designed to initiate a safety measure to reduce the risk of injury to the operator upon receipt of a hazard signal which characterizes a hazardous situation of the operator, characterized in that the detection device comprises an image acquisition device coupled to an image evaluation unit for three-dimensional detection of objects in a monitoring area, and the image evaluation unit for recognizing a human body part, in particular a hand, on the basis of a comparison of images captured in real time ured pattern contours and / or pattern movements and / or pattern deformations is formed, ando is set up to generate a first position signal based on the recognized body part, the first position signal an absolute position of the human body part in the monitoring area or a relative position of a human body part to the machining tool - An electronic signal processing device is provided, which is signal-technically coupled to the detection device and the risk reduction device and is designed to determine from the first position signal whether there is a hazardous situation, in particular a predetermined minimum distance between a part of the user's body and the processing tool and, if it is determined that such a hazardous situation exists, to send the hazard signal to the hazard reduction device.
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