| 摘要 |
PROBLEM TO BE SOLVED: To prevent a rocking motion of a traveling body. SOLUTION: This is an apparatus for preventing a rocking motion of a column 3 traveling along a guide rail 6. Electric magnets 12, 13 are provided on a column-side guide way 11A. The guide rail 6 is made of ferromagnetic material. Means for controlling magnetic force of the electric magnets 12, 13 based on a command for driving the column 3 are provided.
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