Spindle device of machine tool

Abstract

A spindle device of a machine tool capable of preventing coolant mist from being excessively liquefied in an area between a mist outlet memberand near the rear end part of a tool, wherein a straight feed pipeformed of a double tube having an inside tubeand an outside tubeis inserted into an inside hole formed at the center part of a spindlein non-rotating state not coming into contact with the spindle, coolant is fed to the inside tube, compressed air is fed to the outside tube, and a mist generating memberis formed of both tubes near the inside tip part of the spindle, a mist outlet memberis installed into the outside tubeintegrally with each on the mist outlet passage c of the mist generating memberso as to surround the mist outlet passage and a mist guiding extension memberallowed to reach near the rear end part of the tool in the center hole of the tool holder is installed, integrally with the spindle, on the other tool holderside, and the mist guiding passage f of the mist guiding extension memberis allowed to communicate with the mist outlet passage c of the mist outlet memberthrough both a rotary jointand a pressing tube member