| 摘要 |
PROBLEM TO BE SOLVED: To apply less bending load on a shaft member 31 than on a cover part 15.SOLUTION: A support shaft 31a is arranged so that a moving amount of a shaft member 31 to be obtained during a period where a cover part 15 swings from a shaft contact position to a vertical position is equal to a moving amount of the shaft member 31 to be obtained during a period where the cover part 15 swings from the vertical position to a closed position. |
