| 摘要 |
In a slid fork comprising a base portion 4, a middle portion 6, and a top portion 8, a driving motor 20 rotates sprockets 22, 24 to drive chains 26, 36, respectively, at different speeds. The middle portion 6 is fixed to the chain 26, while the top portion 8 is fixed to the chain 36. The chains 26, 36 are driven using a predetermined speed and stroke ratios. No sprockets are provided at a leading end of the middle portion. Therefore, no dust is raised from shelves.
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