| 摘要 |
<p>A coin discriminator has an opening 2 to receive a coin. Entry of the coin pushes back a slider 4 to enable the coin to pass along a coin rundown path 5 to a pivotally mounted sensing arm 6 that is connected to a pivoted vane 8. The coin pivots the arm 6 by an amount dependent upon the diameter of the coin, and this movement is converted into a larger movement of the outer portion of the vane 8. The displacement of the vane is detected by an optical detector 10 which produces a number of electrical pulses dependent upon the number of holes 9 which are swept past it. Electrical contacts (17, 18) (Figure 3) are utilised to test whether the coin is metallic. <IMAGE></p> |
