Abstract: A machine for hemming an edge portion of an arcuate panel having a fixed die with an arcuate contour complementary to the panel, a moveable die head having prehemming and hemming dies thereon with edge contours, respectively, complementary to the edge contour of said panel. A single fluid actuator and a cam controlled linkage effect both vertical and lateral movement of both the hemming die and prehemming die relative to the fixed die upon operation of the actuator. A pair of arms are pivotally attached to the prehemming die to form a radius of rotation which controls horizontal and vertical movement of the prehemming die relative to the moveable die head to provide proper clearance and disengagement between the prehemming die and the edge portion of the arcuate panel and/or the fixed die after completion of the prehemming operation.

Abstract: A machine for hemming a panel having a fixed die with an edge contour complementary to an edge of the panel, a movable die head having prehemming and hemming dies thereon with edge contours, respectively, complementary to the edge contour of said panel, a single fluid actuator, and a cam controlled linkage for effecting both vertical and lateral movement of both said hemming die and said prehemming die relative to said fixed die upon operation of said actuator.