A machine such as a saw, jointer, planer, etc. is disclosed. The machine has cutting tool, a direct drive mechanism configured to move the cutting tool, a detection system adapted to detect the occurrence of an unsafe condition between a person and the cutting tool, and a reaction system adapted to mitigate...http://www.google.de/patents/US20020190581?utm_source=gb-gplus-sharePatent US20020190581 - Apparatus and method for detecting dangerous conditions in power equipment
