| 摘要 |
PROBLEM TO BE SOLVED: To detect the diameter of a led coin with constant accuracy independently of the floating of a charged coin due to its vibration or the like. SOLUTION: First and second diameter detection coils 8 are arranged oppositely to each other so that the axial direction of the coils 8 intersects with the passage of a coin 6 at about right angles, a current is applied at least to either one of the 1st and 2nd coils 8 to generate magnetic flux and the diameter of the coin 6 is detected on the basis of a change in the magnetic flux generated when the coil 6 passes between the 1st and 2nd coils 8. As to a cross-section orthogonal to the axial direction of the coils 8, its dimension in a direction vertical to the passing direction of the coil 6 is greater than the maximum diameter of a coin to be selected, and when each of coins to be selected passes between the 1st and 2nd coil 8, the coin passes, within the size range of the cross-section. When the coin 6 passes, the magnetic flux is always applied from the coils 8 to the whole body of the coin 6 independently of the floating of the coin 6 from a traveling reference surface 7, so that the diameter of the coin 6 can be accurately detected.
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