Single station hemming tooling
Bending apparatus for bending a marginal flange on a workpiece
Drive mechanism for a hemming apparatus Patent #: 5086638
ApplicationNo. 687503 filed on 07/29/1996
US Classes:72/306, Plural or complex apparatus (e.g., with plural operations)29/243.58, Edge binding72/315, Cam or toggle72/323Plural die surface portions and coacting tools
ExaminersPrimary: Crane, Daniel C.
Attorney, Agent or Firm
Foreign Patent References
International ClassB21D 039/02
Foreign Application Priority Data1994-02-14 GB
AbstractA press is described for prehemming and final hemming the internal periphery of an aperture in sheet material received on an anvil (10) on which the sheet material (12) is held down so that the upturned edge (14) of the aperture which is to be hemmed is substantially in alignment with the edge of the opening in the anvil (10). A composite hemming tool (40, 42) is provided adapted to perform prehemming and final hemming and carried b a tool carrier (36, 38). Drive means (24, 26) protrudes up from the press through the opening in the anvil so that a lower inclined leading edge (44, 46) of the tool substantially registers with the upturned edge (14) to be hemmed. The drive means operates so as to force the tool first of all towards the edge so as to bend the upturned edge over until it is bent through substantially 90 degrees from its upstanding position and thereafter to move in a generally downward direction so as to compress the downturned ege. A method of hemming is also described based on this machine.