| 摘要 |
A clamping assembly for a machine that levels sheet metal by stretching the metal beyond its elastic limit includes two jaws which have generally planar gripping surfaces. When the jaws are forced together, the gripping surfaces on them bear against the sheet metal with enough frictional contact to enable a stretching force to be applied to the sheet metal. One of the jaws includes a bearing block and a gripping pad located along the bearing block, with the gripping surface for that jaw being on the pad. A shim that is narrower than the pad lies between the pad and the bearing block. When the pad is forced against the sheet metal, the shim behind that pad causes the pad to assume a slight contour that imparts convexity to its gripping surface. This concentrates the gripping force at the centers of the gripping surfaces on the two jaws, so that perceptible indentations do not develop in the strip at the side edges of the gripping surfaces.
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