| 摘要 |
PROBLEM TO BE SOLVED: To execute dynamic, impactful performance by a performance device which has a simple configuration and can save space.SOLUTION: Blade plates 32, 33 back and forth are relatively freely rotatable around a rotation axis 42 between an expanded state in which an engaging part 44 moves to one end 43a of an engaging hole 43 and is abutted and a storage state in which it moves to the other end 43b and is abutted. A blade plate driving motor is driven for rotation of the front side blade plate 32 in a forward direction 72 and an opposite direction 73. When in the storage state, the front side blade plate 32 rotates in the forward direction 72, an engaging part 44 moves inside the engaging hole 43, is abutted to the one end 43a, and enters the expanded state, and the blade plates 32, 33 back and forth rotate in the forward direction 72 by maintaining the expanded state. When in the expanded state, the front side blade plate 32 rotates in the opposite direction 73, the engaging part 44 moves in the engaging hole 43, is abutted to the other end 43b, and enters the storage state, and the blade plates 32, 33 back and forth rotate in the opposite direction 73 by maintaining the storage state.SELECTED DRAWING: Figure 10 |
