| 摘要 |
<p>A gemstone holding device includes a first unit to lock a gemstone relative to a gemstone processing ring, a second unit to lift the gemstone processing ring to a target position, a dual motion gear to move theaid first unit and the second unit during a single rotation and a motor to rotate the dual motion gear. The dual motion gear includes a geared upper disk having at least one rising long cam and a non-geared lower disk having at least one lowering short cam. The lowering short cam minimally overlaps the rising long cam.</p> |
