| 摘要 |
PROBLEM TO BE SOLVED: To ensure safety even if an obstacle exists within a movable range of a structure member.SOLUTION: A prize field 16L is supported by a plurality of X members for changing height of the prize field 16L from a lower portion. A field motor 45 supplies driving force for moving the prize field 16L up or down via the X members. A slider block 60a and a nut 61a stored inside a slide unit transmit the driving force from the field motor 45 to the X members in a state, where the X members can lower the prize field 16L, and separate and do not transmit the driving force from the field motor 45 in a state, where the X members cannot lower the prize field because of an obstacle, or the like. |
