Rothwell, Figg, Ernst & Kurz
Positioning device for a machining apparatus
 A positioning device for a machining apparatus includes at least two independent driving mechanisms for movably adjusting a relative position of a work with respect to the machining head along at least one direction, wherein a first driving mechanism has greater inertia than a second driving mechanism. A first servo control system controls the first driving mechanism in accordance with a target value of a relative position of the work with respect to the head. A second servo control system controls the second driving mechanism utilizing as a target command value thereof an error of the first control system with respect to said target value, such that the relative position of the work with respect to the head is controlled to the target value of the relative position of the work with respect to the head. 
Mitsubishi Denki Kabushiki Kaisha
B G G
B23K G05B G05B
inventional additional inventional
Takao Masahiro
Bamba Fujita