| 摘要 |
PURPOSE:To insure a detection part against oscillating abnormally even if the sharpness of a tuner is improved by inserting opened and close switches that can turn on and off a tuning circuit and besides turns on another tuning circuit before the former tuning circuit is turned off into plural tuning circuits. CONSTITUTION:When an unmanned carrier 1 that travels a main path A by tuning to an electromagnet wave generated by an induction line 3A while it is guided to the 2nd subpath 2C as its destination reaches a branch point A, the reading part 44 of a route selection device 12 reads a pattern P1, operates the operation switch PB2 of the 2nd control circuit 50, and turns on the 2nd opened and closed switch 11B. Then a relay R2 and a timer T2 are conducted. After t-sec passes, the time limit switch PS1 of the 1st control circuit 49 opens the 1st control circuit 49 while said switch is holding the conduction of the 1st control circuit 49. Thus the abnormal oscillation of the pickup coils 4R and 4L due to the opening of the circuit can be prevented, and the run-away of the unmanned carrier can be suppressed.
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