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Rigidly attached to top die member 1 are dogleg cams whose lower ends b slide in fixed guides of bottom die member 3, These dogleg cams have inclined surfaces a which slide along the corresponding surfaces of sliding members 2. In the down-stroke of top die member 1, sliding members 2 are moved horizontally inward (arrows B and C). At this, punches c and d perform the required pressworking operatiā€¦