WORKING RANGE SETTING DEVICE OF INDUSTRIAL ROBOT

摘要

PURPOSE:To stop the action of an arm part of an industrial robot when a wiring has a disconnection by actuating a drive source cut-off means with the output of a voltage comparator where the output side of a resistance divider is connected with a fixed resistance put into an area between said output side and a reference earth. CONSTITUTION:The output sides of variable resistances 12 and 13 for generation of comparison voltage are connected to the input terminal of either one of voltage comparators 10 and 11. While the output side of a resistance divider 9 whose output is varied by the actions of an arm part of a robot is connected to the other input terminal of the voltage comparator with a fixed resistance 16 put into an area between said output side and a reference earth. In case the output voltage of the divider 9 is not set at a level between V1 corresponding to the lower working limit theta1 and V2 corresponding to the upper working limit theta2, a drive source cut-off circuit 15 is driven by the outputs of comparators 10 and 11. Then the action of the robot is stopped when disconnections occur to a bias supply wiring to the divider 9 and an output wiring.