Patent ID: 8459079

Claim:
An auto-scraping apparatus for a work piece of a hard rail comprising: a tracking device having a connecting frame; a moving frame movably connected to the connecting frame; a lifting frame movably connected to the moving frame; and a tool frame pivotally connected to the lifting frame; a driving device connected to the tracking device and having two linear motion units, one of the linear motion units, driving the moving frame to move forward or backward relative to the connecting frame and the other linear motion unit, driving the lifting frame to move upward or downward relative to the moving frame; and a rotating motion unit mounted in the tool frame and having a front side; and a rotating shaft rotatably mounted on and protruding from the front side of the rotating motion unit and extending out of the tool frame; and a ball bearing mounted on the front side of the rotating motion unit around the rotating shaft; and a tool device detachably connected to the driving device and having a tool carrier securely mounted around the rotating shaft of the rotating motion unit, directly driven by the rotating shaft, mounted in and abutting with the ball bearing and having at least one mounting surface opposite to the rotating shaft; and a relieving tool securely mounted on the at least one mounting surface of the tool carrier and having a front end; and a relieving panel detachably connected to the front end of the relieving tool.