| 摘要 |
A method and apparatus (2) for providing a bead (4) around a side wall (10) of a metal container (8). The apparatus includes a mandrel (16) over which side walls (10) of the container are disposed. The mandrel (16) has reaction members (20) with reaction surfaces for supporting the side walls internally and a plurality of forming members (18) surrounding the mandrel having forming surfaces being substantially parallel with the reaction surfaces but separated therefrom to define a gap between the surfaces which receives the side walls (10). The reaction members (20) and forming members (18) are capable of displacement towards and away from one another such that the gap between the reaction surfaces and forming surfaces can effectively expand and contract. The reaction surfaces and forming surfaces are provided with complementary formations thereon to deform the side walls therebetween and form a bead (4) therein. The reaction members (20) and the forming members (18) are moved back and forth by virtue of cams coupled to each reaction member and forming member which roll on cam surfaces provided on an actuating member (26) having a linear reciprocal motion parallel with the axis of the mandrel (16). The cams convert the linear axial motion of the actuating plate towards and away from the mandrel to lateral motion of the forming surfaces and reaction surfaces towards and away from each other. The curl (6) is formed on the container by coupling a further plate having grooves to the actuating member. <IMAGE> |
