| 摘要 |
The device is made as a magnetic switch, either a reed switch (7) with a permanent magnet (6) or a ring coil (8) with a permanent magnet (6). In each case a magnet field is produced normally and, when this is changed, an electric signal is released by the need switch or the ring coil, whichever is used. The figure makes the operation clear. The insertion of a coin (1) presses against the lever (2) moving its towards the right, and with it the permanent magnet closer to the coil or the need switch and changing the magnetic field being applied.
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