Patent ID: 8292035

Claim:
An oil/air lubrication system for lubricating a rotary portion of a machine tool with oil/air, said system comprising: a pipe line for feeding the oil/air into the rotary portion of the machine tool; a mixing valve connected to the pipe line, for mixing microscopic lubrication oil and compressed air with each other so as to form the oil/air, and for intermittently discharging the oil/air; a detecting means provided to the pipe line in the vicinity of the mixing valve, just downstream of the mixing valve, for detecting a flow in mass of the lubrication oil just after being discharged from the mixing valve, with the use of electromagnetic waves having a frequency of 2.45 GHz or 0.93 GHz; an abnormality signal output means for outputting an abnormality signal when the detection means fails to detect the flow of lubrication oil; and wherein the detection means is removably attached to the pipeline so as to cause a detecting portion of the detection means to surround the outer periphery of the pipeline.