| 摘要 |
PROBLEM TO BE SOLVED: To reduce a failure occurrence probability of a falling prevention mechanism, and to easily notice failure even if the failure is caused. SOLUTION: A first slider 8 can move in the vertical direction to a fixed base 7, and a second slider 10 can move in the vertical direction to this first slider 8. The second slider 10 is moved ahead of this to the first slider 8 by a moving mechanism 11 for the second slider having pulleys 22A and 22B and a belt 23 when the first slider 8 is moved. The falling prevention mechanism 24 has a lever 25 rotatably supported by a support shaft 26 in an intermediate part between both pulleys 22A and 22B in the first slider 8 and having a first long hole part 27A and a second long hole part 27B, a first pin 29A arranged on the fixed base 7 and a second pin 29B arranged in the second slider 10, and the first pin 29A and the second pin 29B are arranged in point symmetry with the support shaft 26 as the center. COPYRIGHT: (C)2011,JPO&INPIT
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