| 摘要 |
The support gap control device is provided to diversify the support gap with the simple configuration. The support gap control device includes the first turning gear(10); a pair of first and second rack(12,14) which are arranged opposite to each other and both sides of the first turning gear; a pair of first and second fixing member(13) which are combined with the first of the second rack; the driving unit(20) for operating the first turning gear. The support gap control device includes the second turning gear(30) which is arranged behind the first turning gear; the third and fourth fixing members(33,35) connected to the second turning gear.
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