| 摘要 |
<p>An apparatus constructed to be received within an interior opening of a sheet metal panels to form a pre-hem and a complete hem about the periphery of the opening with a plurality of generally radially outwardly movable hemming plates or steels which are driven by an actuator to move from a retracted position within the opening to an extended position overlying a portion of the periphery of the opening to pre-hem a flange about the periphery of the opening. With the hem steels in their extended position, a second actuator displaces the steels towards the sheet metal panels to complete the folding or final hemming of the flange about the periphery of the opening. After forming the hem flange, the second actuator is reversed to move the hem steels away from the sheet metal panels and then the first actuator is reversed to move the hemming steels to their retracted position within and spaced from the periphery of the opening of the hemmed sheet metal panels so that the hemmed panels can be removed from the apparatus. <IMAGE></p> |
