| 摘要 |
an interlocking gear(22) in a casing(10), that is connected to a main spindle(20) for lifting/dropping an ascent/descent screw(30); a leader shaft(40) that is mounted in a gear chamber(11) at one side of the casing(10), and connected to a gear(41); and a speed variation means having planetary teeth(60) that engage with inner teeth(52) of a gear wheel(50), and the interlocking gear(22).
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