Patent ID: 8525064
Filing Date: 2013-09-03
Classification: B23H

Abstract:
1. An electric discharge machine to process a work piece comprising: a plurality of electrodes to generate a plurality of discharges with the work piece, respectively, so as to process the work piece; a plurality of discharge power supply units to apply voltages for the plurality of electrodes, respectively, the discharge power supply units being independent from each other and operating separately from each other; a plurality of discharge head units; and a plurality of feeding lines, wherein the plurality of discharge head units have a plurality of drive mechanisms, respectively, to hold the corresponding one electrode and to change a position of the corresponding electrode, and have a plurality of conduction medium portions, respectively, to electrically connect the corresponding one discharge power supply unit to the corresponding electrode, each of the feeding lines electrically connects a connection terminal of the conduction medium portion of the corresponding one discharge head unit to a feeding terminal of the corresponding discharge power supply unit, the plurality of feeding lines have dimensions equal with each other, the feeding terminal and the connection terminal corresponding with each other, and the work piece are arranged on a straight line when seen from one direction of the electric discharge machine, the connection terminals of the plurality of discharge head units are arranged in equal intervals on a first circumference centering on a position of the work piece when seen from one direction of the electric discharge machine, the feeding terminals of the plurality of discharge power supply units are arranged in equal intervals on a second circumference centering on the position of the work piece when seen from the one direction of the electric discharge machine, and the second circumference is larger than the first circumference, and each of the plurality of electrodes has a contact point contact with the conduction medium portion of the corresponding discharge head unit, and distances from the contact points to ends of the electrodes adjacent to the work piece are approximately equal with each other.