Chuck

特許 係属中 PROBLEM TO BE SOLVED: To overcome the problem with a safety monitoring system for a chuck holding a workpiece mounted to a machine tool used for machining, wherein an output is transmitted as radio waves, and time is required for converting detected data in digital conversion, modulation and demodulation, so that it takes time to notify failure information, the failure information cannot be notified in time for generation of failure, and a damage in the workpiece or scattering of the workpiece cannot be prevented.