Patent ID: 6460387
Filing Date: 2002-10-08
Classification: B21D

Abstract:
A punch press, comprising:a press main body; an upper turret member being arranged on the press main body, the upper turret member being provided with a plurality of attachable/detachable punches; a lower turret member being arranged on the press main body so as to be opposed to the upper turret member in a vertical direction, the lower turret member being provided with a plurality of attachable/detachable dies; a striker being provided above the upper turret member, the striker being moveable upward and downward for pressing a predetermined punch from above; striker ascending/descending means for ascending/descending the striker; a carriage being movable in a horizontal direction, the carriage being provided with a clamper for holding a workpiece in order to position the workpiece between the upper turret member and the lower turret member; and carriage moving means to move the carriage in the horizontal direction; wherein the upper turret member comprises: a turret member main body; a workpiece detecting plate being provided at a lower portion of the turret member main body; and an insulating body which insulates the turret member main body and the workpiece detecting plate from each other; wherein one end of a first conductive wire is electrically connected to the workpiece detecting plate; wherein the clamper and the carriage are electrically connected to the press main body; wherein one end of a second conductive wire is electrically connected to the press main body; and wherein the other end of the first conductive wire and the other end of the second conductive wire are electrically connected to a touch detecting unit to detect a touch between the workpiece detecting plate of the upper turret member and a workpiece which is clamped by the clamper.