| 摘要 |
<p>In order to provide a hemming press for automotive body panels which requires a small operating force and can be powered by, for example, an electric motor (46), a press tool (50) is mounted on a mechanism which, as it approaches a final press position, is somewhat like a parallelogram with an elbow (P4) in one side (K2, K3) of the parallelogram. The elbow is straightened by a motor driven crank (C1) and linkage (K5) which also form a straightened elbow (P8). Furthermore, another side of the parallelogram is formed by a 2:1 lever (V1) which provides further amplification of the applied force. One corner (P5) of the parallelogram acts as a fixed pivot as the press approaches its final pressing position, but at other times that corner is movable and allows a cam arrangement (M1, M2) to lift the tool (50) well clear of the workpiece (28).</p> |
