| 摘要 |
A pair of rotary wheels, a counter-rotating mechanism for rotating these rotary wheels in opposite directions, and a drive source for driving the rotary wheels through the counter-rotating mechanism are provided. A ball is nipped between the outer peripheral surfaces of the rotary wheels and is thereby thrown. The drive source is in the form of an engine having an output pulley, while the counter-rotating mechanism has an input pulley. A transmission belt is entrained around these pulleys.
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