DETECTING METHOD FOR PASSAGE OF MOVABLE OBJECT

摘要

PURPOSE:To provide the passing detection method of a movable object for surely judging and discriminating a passing direction. CONSTITUTION:A remotely readable identification card 2 is attached to the respective movable objects 1 and the read means 3 of the identification card 2 is installed at the prescribed position of the path 5 of the movable objects 1. The prescribed position is provided with the light sources 8a and 8b of two light beams 7a and 7b crossing with the path 5 with an interval in a passing direction sufficiently shorter than the width in the passing direction of the movable object 1 and a pair of photoelectric type switches 9a and 9b for respectively detecting the light beams 7a and 7b. At the time of initial light beam detection by either one of the photoelectric switches 9a and 9b after both photoelectric switches 9a and 9b simultaneously detect the interruption of the light beams, the passing direction of the movable object 1 is judged, the identification card 2 of the movable object 1 is read by the read means 3 at the time of judging the passing direction and the movable object 1 is discriminated.