Patent ID: 8065902

Claim:
A hemming apparatus for hemming an inner periphery bent portion of a workpiece having a frame, the inner periphery bent portion being previously formed at the inner periphery of the workpiece, the hemming apparatus comprising: a first platen including a support table for supporting the workpiece thereon; and a second platen disposed to face the first platen, wherein the first platen further includes an inner periphery hem punch disposed to come inside the frame of the workpiece and capable of being pressed against the inner periphery bent portion, an outside cam follower disposed to come outside the frame of the workpiece, and a connecting member connecting the outside cam follower and the inner periphery hem punch to transmit the movement of the outside cam follower to the inner periphery hem punch, the second platen includes an outside driver cam engageable against the outside cam follower by relative movement of the second platen towards the first platen, and the outside driver cam is configured to move the outside cam follower so that the inner periphery hem punch reaches a position to be pressed against the inner periphery bent portion.