| 摘要 |
A flat metal sheet is engaged by a downwardly moving rectangular anvil. The anvil passes through a space between two planar supports, carrying contiguous sheet metal portions with it, distorting them to a U-form. The bight portion of the U is moved into a slot in a rotary drum. The anvil is withdrawn and the drum rotates, carrying the sheet against curved cam surfaces to yield the finished configuration.
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