| 摘要 |
A drum with a cylindrical body having an upper end and a lower end and a circular bottom wall secured across said lower end includes a cylindrical core having an inner cylindrical surface, an upper end and a lower end which is fixedly secured to the bottom wall to define an annular wire receiving space between said core and said body of said drum wherein an improved wire biasing mechanism is provided for applying a downward force against wire in the wire receiving space, by a generally flat pressure ring resting on the wire and an elongated, elastic element connected to a loop element attached to the lower end of said core for pulling the pressure ring downwardly.
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