Patent ID: 8640614
Filing Date: 2014-02-04
Classification: B21D

Abstract:
1. A workpiece transfer apparatus of a press machine, comprising: a pair of transfer bars that are provided parallel to a workpiece transfer direction; a feed driving mechanism that drives the pair of the transfer bars in the workpiece transfer direction; and a lift/clamp driving mechanism that drives the pair of transfer bars in a lift direction to move up and down and drives the pair of transfer bars in a clamp direction perpendicular to the workpiece transfer direction, wherein the lift/clamp driving mechanism comprises: a support that supports each of the transfer bars; a first carrier that is movable in the clamp direction; a second carrier that is movable in the clamp direction in a manner independent of the first carrier; a first carrier driving mechanism that drives the first carrier in the clamp direction; a second carrier driving mechanism that drives the second carrier in the clamp direction; a parallel link including a first link and a second link that are connected to the first carrier and the support and are rotatable around a connector between the parallel link and the first carrier and a connector between the parallel link and the support; a driving link that is connected to the first link of the parallel link and the second carrier and is rotatable around a connector between the driving link and the first link and a connector between the driving link and the second carrier; a first guide that guides the first carrier to move in the clamp direction; and a second guide that guides the second carrier to move in the clamp direction, the first and second guides being parallel to each other and being shifted therefrom in the workpiece transfer direction.