| 摘要 |
In a machine for forming an annular radially inwardly projecting bead in the cylindrical end portion of a tubular sheet metal fitting to provide the sidewalls and bottom of a radially outwardly opening channel, which machine includes male and female channel-forming power-driven rollers rotatable in opposite directions with a side of said cylindrical end portion between them, to rotate said portion and to form said bead. The male roller is floatingly supported for axial movement and is movable under force transversely thereof and radially of said cylinder toward the female roller and a rotating thrust surface axially engages the circular end edge of the tubular fitting adjacent to the male roller for progressively drawing the metal of said marginal portion to form a deeper channel than heretofore, during rotation of said rollers for rotating said tubular portion.
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