Patent ID: 6895827

Claim:
A torque measuring device for a rotating body, comprising: a rotary section composed of a first flange to be joined to a driving shaft powered, a second flange to be joined to a driven shaft loaded, and a hollow cylinder having the first and second flanges formed respectively on both edges thereof; a plurality of light emitting elements provided at an outer circumference of the rotary section and functioning to emit light according to an output from torque detectors provided at an inner circumference of the hollow cylinder thereby generating an optical signal; a light receiving fiber to receive the optical signal from the light emitting elements; a plurality of optical-electrical signal converters provided so as to face both end surfaces of the light receiving fiber, and functioning to convert the optical signal into an electrical signal; and a malfunction detector to detect malfunction of the light receiving fiber according to the electrical signal outputted from the optical-electrical signal converters.