| 摘要 |
PROBLEM TO BE SOLVED: To realize an inexpensive and safe ball supplying device by using a solenoid. SOLUTION: A judgment is made on whether 2.5 sec passes after the start of the supply of balls with a solenoid 63g (S24). When 2.5 sec passes even before the number of supplied balls reaches 25 (S24: Yes), the supply of the balls with the solenoid 63g is stopped once. Therefore, as there is no continuous operation beyond 2.5 sec, the heating of the solenoid 63g can be prevented thereby enabling safe use of a ball rental unit 63.
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