Patent ID: 8429811

Claim:
A tandem press system comprising: a plurality of presses disposed in a workpiece transfer direction; a workpiece transfer device that transfers a workpiece from an upstream press to a downstream press using a tool mounted on the workpiece transfer device via a crossbar; and a tool replacement device that replaces the tool mounted on the workpiece transfer device, wherein the tool replacement device can be transferred from an inter-press space between the upstream press and the downstream press to an external space in a tool replacement direction that perpendicularly intersects the workpiece transfer direction independently of transfer of a bolster provided with a die to an external space in a die replacement direction that perpendicularly intersects the workpiece transfer direction; wherein two receiving sections disposed in parallel in the workpiece transfer direction are provided in a crossbar mounting section of the tool replacement device, and two crossbars can be respectively mounted on the two receiving sections at the same time; wherein a current crossbar mounted with a current tool can be delivered from the workpiece transfer device to empty one of the receiving sections of the tool replacement device in the inter-press space during a press suspension period, and a subsequent crossbar mounted with a subsequent tool can be delivered to the workpiece transfer device from one of the receiving sections of the tool replacement device; and wherein the tool replacement device that has received the current crossbar can be transferred to the external space in the tool replacement direction, and the current crossbar can be removed from one of the receiving sections in the external space, and the subsequent crossbar can be mounted on the other of the receiving sections.