Patent ID: 6676000
Filing Date: 2004-01-13
Classification: B21J,Y10T

Abstract:
A drive system for a fastening tool for fastening one or a plurality of workpieces of ductile material, the fastening tool comprising a punch for performing a fastening operation and a clamp axially displaceable relative to said punch and providing a clamping force for clamping said one or said plurality of workpieces during said fastening operation, the drive system comprising:a drive, a punch member adapted to be axially displaced by said drive for actuating said punch, and a clamp member adapted to be axially displaced by said punch member via force transmitting means for actuating said clamp, said force transmitting means comprising an air pressure chamber of variable volume between said clamp member and said punch member, the volume of said air pressure chamber being adapted to be reduced by axial relative movements between said punch and said clamp during said fastening operation in order to compress pressure air within said air pressure chamber so as to increase the clamping force provided by said clamp.