| 摘要 |
PROBLEM TO BE SOLVED: To freely perform a layout, and largely improve the working efficiency. SOLUTION: A pair of cross-sectional U-shaped rails 13, 13 are arranged in parallel. A freely movable pallet 18 is arranged on the rails 13, 13. Wheels 21 are arranged on the advancing dirtectional both sides of the pallet 18. The wheels 21 are respectively fitted in both rails 13, 13 so as to be freely rollable. A rack gear 14 is arranged along the rails 13. A worm gear 20 meshing with the rack gear 14 is arranged on the pallet 18. A driving device (a motor) 19 for driving the worm gear 20 is arranged on the pallet 18.
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