Detector to determine absolute position of moving rail vehicle - includes two kinds of positioning devices with first counted by counter reset by second

摘要

The rail guided vehicle moves along a specified path, and the appts. has two series of fixed positioning units along the path, and a counter operated when the vehicle passes a positioning device. A number of first positioning devices (12a) not repeated along the travel path is provided between two consecutive second positioning devices, 14a, 14b). The first positioning devices are counted by the counter (38) reset by the second positioning device (14a, 14b). The pick up signals (28, 30) are obtained from light beans the second unit being connected to the counter through a delay unit (36).