| 摘要 |
PROBLEM TO BE SOLVED: To provide a railroad crossing gate that eliminates the need for manual intervention after start of mounting position adjustment of a position detector, by automatically setting an upper side position and a lower side position in the ascending/descending range of a shutdown rod after start of the adjustment.SOLUTION: A railroad crossing gate includes: a motor 14 for making a shutdown rod 20 swing in an ascending/descending range; a control unit 12 for performing feedback control by a motion state detection signal Pf indicating a motor rotating position; an upper limit stopper of an ascent limit position; a lower limit stopper of a descent limit position; a lower side position detector 16 of the ascending/descending range; and a driven state detector 13a for detecting a driven state of the motor 14. Automatic setting means for the ascending/descending range of the control unit 12 makes the motor 14 ascend and descend, and it is detected by a driven state detection signal If that the ascending/descending limit is reached. Based on the motor rotating position in both detection, each of an upper side position and a lower side position of the ascending/descending range is associated with the motor rotating position. The association is distributed proportionally, based on a fixed value concerning the swinging of the shutdown rod, and also the detection of the lower side position detector 16 is completion conditions. |
