Patent ID: 7952045

Claim:
A material piece scooping device for extracting a material piece from a surface of an object to be scooped through generating an electric discharge between an electric discharge electrode and the object to be scooped so as to successively remove the material piece from the object to be scooped that is disposed to oppose the electric discharge electrode, comprising: a rotation drive section; an arm portion driven to rotate around a rotational axis thereof with the rotation drive section; an electrode holder supported with the arm portion for detachably mounting the electric discharge electrode thereon; a sliding section for sliding the arm portion in a direction perpendicular to the rotational axis; and an arm portion length adjusting section for adjusting length of the arm portion from the rotational axis so as to adjust a trajectory of the electric discharge electrode when the arm portion is driven to rotate so that the material piece is scooped from the surface of the object to be scooped along a line where the trajectory of the electric discharge electrode crosses the object to be scooped.