Drive device for a pressing machine

A drive device for an electric servo press machine including at least a pair of left and right electric servo motors as drive sources, the drive device comprising:

• a left drive shaft rotationally driven directly or through intermediation of gears by an electric servo motor on a left side of the pair of left and right electric servo motors;
• a right drive shaft rotationally driven directly or through intermediation of gears by an electric servo motor on a right side of the pair of left and right electric servo motors;
• a left-front drive gear and a left-rear drive gear, which have the same specifications, and are provided coaxially and integrally with the left drive shaft;
• a right-front drive gear and a right-rear drive gear, which have the same specifications, and are provided coaxially and integrally with the right drive shaft;
• a left-front intermediate gear and a left-rear intermediate gear, which have the same specifications, and are meshed with the left-front drive gear and the left-rear drive gear, respectively;
• a right-front intermediate gear and a right-rear intermediate gear, which have the same specifications, and are meshed with the right-front drive gear and the right-rear drive gear, respectively;
• a left-front main pinion gear and a left-rear main pinion gear, which have the same specifications, and are provided coaxially and integrally with the left-front intermediate gear and the left-rear intermediate gear, respectively;
• a right-front main pinion gear and a right-rear main pinion gear, which have the same specifications, and are provided coaxially and integrally with the right-front intermediate gear and the right-rear intermediate gear, respectively;
• a left-front main gear and a left-rear main gear, which have the same specifications, are meshed with the left-front main pinion gear and the left-rear main pinion gear, respectively, and are provided coaxially with each other;
• a right-front main gear and a right-rear main gear, which have the same specifications, are meshed with the right-front main pinion gear and the right-rear main pinion gear, respectively, and are provided coaxially with each other;
• a left crankpin provided integrally with the left-front main gear and the left-rear main gear at a position offset in a predetermined manner from a common rotation center axis of the left-front main gear and the left-rear main gear;
• a right crankpin provided integrally with the right-front main gear and the right-rear main gear at a position offset in a predetermined manner from a common rotation center axis of the right-front main gear and the right-rear main gear;
• a left-front connecting rod and a left-rear connecting rod having base end sides supported so as to be rotatable with respect to the left crankpin;
• a right-front connecting rod and a right-rear connecting rod having base end sides supported so as to be rotatable with respect to the right crankpin;
• and
• a slide supported on respective distal end sides of the left-front connecting rod, the left-rear connecting rod, the right-front connecting rod, and the right-rear connecting rod so as to be vertically movable.