Abstract: An apparatus for transferring a driving force to a jig unit, comprising a plurality of fixed station coupling assemblies mounted on a support member, each assembly having a fixed station connector to which a driving force transfer means is connected; a jig unit coupling assembly mounted on a jig unit is provided to move in the direction of the fixed station coupling assembly for connecting the unit side connector to the fixed station connectors to feed a driving force to the jig unit; an actuating means is provided on one of the fixed and unit side coupling assemblies to move a respective connector in the direction to secure both fixed station and jig unit connectors in a connected position; and an engaging means holds both the coupling assemblies at a proper position by engaging locking parts provided on both coupling assemblies.

Abstract: A beaded edge is formed on a plate member, which has an upstanding outer edge bent with a predetermined radius of curvature, by placing the plate member on a lower die and applying a uniform force against the free edge of the upturned portion at an approximately 45.degree. angle to turn the outer portion inwardly to form an angle of about 45.degree. with the plate member, and then pressing the free edge downward into contact with the plate member while maintaining a substantially constant curvature of the bend region to produce a beaded edge.