Importance

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Abstract

An industrial robot control method and apparatus having a pulse distributing circuit for executing a pulse distribution operation on the basis of positional command data from taught data to generate distributed pulses, a pulse coder for generating a feedback pulse each time the industrial robot moves a predetermined amount along the Z-axis, an error register for storing the difference between the number of distributed pulses and the number of feedback pulses, and positional control circuitry for positionally controlling the industrial robot in such a manner that said difference approaches zero, compensation being effected for an amount of bending .DELTA.Z of an arm when a workpiece of weight W is gripped. The industrial robot control apparatus includes a memory for storing an amount of bending .DELTA.Z.sub.o of the arm when a workpiece having a predetermined weight W.sub.o is gripped at an arm length l.sub.o, an arithmetic circuit for computing an amount of bending .DELTA.Z when a workpiece of weight W is gripped at an arm length l, said computation being performed using .DELTA.Z.sub.o, l.sub.o, W.sub.o, l and W, and an adding circuit for adding .DELTA.Z and an incremental commanded amount of movement Z.sub.d along the Z-axis and for delivering the sum of the pulse distributing circuit, the pulse distributing circuit generating distributed pulses corresponding to (Z.sub.d +.DELTA.Z), whereby a positional error due to bending is corrected.

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First Claim