| 摘要 |
PROBLEM TO BE SOLVED: To keep a detection switch, mounted on a winning device, in the state of a new product to be reused by avoiding the trace and soiling on the inner wall surface of a ball detection hole of the detection switch caused by the contact with balls. SOLUTION: The diameter of the inner wall surface 22a of the ball detection hole 22 of the detection switch 2, facing a shot-in ball passage 7 which pierces through a ball receiving part 3 of the winning device 1, is larger than the diameter of the inner wall surface 7a of the shot-in ball passage, and the inner wall surface 22a of the ball detection hole 22 is set back so that the ball A passing through the shot-in ball passage 7 will not touch the inner wall surface 22a of the ball detection hole, and the soiling of the inner wall surface can be prevented. COPYRIGHT: (C)2006,JPO&NCIPI
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