Patent ID: 7810635

Claim:
A substrate transfer apparatus comprising: a first guide rail on which a first conveyor belt is rotatably supported and at which one side of a substrate to be transferred is disposed; a first ball screw nut fixed with respect to the first guide rail; a ball screw shaft inserted into the first ball screw nut and rotatably disposed to move the first ball screw nut and the first guide rail in an axial direction of the ball screw shaft during rotation thereof; a second guide rail spaced apart from the first guide rail, on which a second conveyor belt is rotatably supported, and at which another side of the substrate to be transferred is disposed, the first conveyor belt and the second conveyor belt operable to transfer the substrate disposed thereon; a second ball screw nut rotatably supported on the second guide rail and operable to engage the ball screw shaft to move the second guide rail in the axial direction of the ball screw shaft when the ball screw shaft is rotated; a first drive unit connected to the ball screw shaft and operable to rotate the ball screw shaft; and a second drive unit connected to the second ball screw nut and operable to rotate the second ball screw nut.