Patent ID: 7217230

Claim:
An apparatus for detecting a position of a drawbar unit of an automatic tool exchange device for clamping a tool, the tool exchange device including the drawbar unit and a spindle unit receiving the drawbar unit for allowing the drawbar unit to easily clamp the tool, the position detecting apparatus for the drawbar unit comprising: a core installed at a rear peripheral portion of the drawbar unit; a coil section wound around an outer peripheral portion of the core and having a hollow cylindrical shape with a predetermined thickness and a predetermined length; an LC oscillator connected to the coil section for generating a frequency signal, which varies depending on an inductance value of the coil section; and a position detecting section connected to the LC oscillator so as to transmit position information of the drawbar unit to a main controller by detecting the position of the drawbar unit based on the frequency signal generated from the LC oscillator.