METHOD FOR SELF-SYNCHRONIZING CONVEYOR BELT SENSOR SYSTEM

PROBLEM TO BE SOLVED: To suppress detection error to the minimum extent in synchronization with detection by a conveyor belt sensor. SOLUTION: This movable conveyor belt system has a plurality of sensors 8 arranged along a belt 86 at an interval and detector heads 90, 92 for detecting and distinguishing the sensors 88 passing through the detector heads 90, 92. The belt 86 includes a plurality of tags 96 arranged along the belt 86 at an interval and a tag reader 94 for detecting and distinguishing the existence of the tag passing through a reading head 94. Related time and distance target value with respect to the next sensor S1 are obtained from a calibration table based on the detected, distinguished, and functioning tag 96 to start operation of counters for time and distance. The conveyor belt 86 is stopped if the next sensor S1 is not detected before exceeding the time and the distance target value. COPYRIGHT: (C)2007,JPO&INPIT