Patent ID: 7721584

Claim:
A workpiece transfer device of a press machine, comprising: a pair of bar assemblies that are disposed substantially in parallel to a workpiece transfer direction; a workpiece holder that holds a workpiece; a respective feed driving mechanism that moves the workpiece holder in the workpiece transfer direction relative to and along each of the pair of bar assemblies; and a respective bar driving mechanism that drives each of the pair of bar assemblies at least either in a lift direction or in a clamp direction, wherein each of the bar assemblies includes a fixed bar that is fixed on the respective bar driving mechanism, a movable bar that is separable from the fixed bar and a bar connecting device that connects the fixed bar and the movable bar, the fixed bar and movable bar of each bar assembly being substantally parallel to the work transfer direction, wherein each feed driving mechanism includes a slide member that is supported by and slidable along the movable bar of the respective bar assembly, a movable member that is supported by and slidable along the fixed bar of the respective bar assembly, a connecting portion that connects the slide member and the movable member, and a feed driving source that is provided on the fixed bar and moves the movable member along the fixed bar in the workpiece transfer direction, the workpiece holder being provided in connection with the slide member, and wherein the connecting portion of each feed driving mechanism includes an engaging portion that is provided to one of the slide member and the movable member, and an engaged portion that is provided to the other of the slide member and the movable member and engageable with the engaging portion, and the engaging portion is engagable with the engaged portion in a direction substantially orthogonal to a longitudinal direction of the pair of bar assemblies.