| 摘要 |
PURPOSE:To obtain a mark discriminating method for an unattended tack where the mark is discriminated with high accuracy by installing plural magnets to the mark part in different pattern. CONSTITUTION:Mark detectors 7a, 7b are arranged in order in the progressing direction of the unattended track 1, the same sensitivity is given to them and they generate an output proportional to a distance between a mark guide line 6 and the 1st and 2nd lead sections 6a, 6b when the line 6 approaches the sections 6a, 6b and is parted from them. The distance (l) between the lead sections 6a, 6b of the mark guide line 6 is selected differently depending on the kind of mark, and the unattended track 1 measures the running distance that after the difference of the outputs of the mark detectors 7a, 7b is zero at the passing of the 1st lead section 6a, the difference is again zero by the passing of the 2nd lead section 6b attended with the running of the track 1 by counting the pulse number generated from a pulse encoder 4, and discriminates the kind of the mark 6 depending on that the running distance corresponds to the distance (l) of the 1st and 2nd lead sections 6a, 6b. |
