INDUSTRIAL ROBOT

PURPOSE:To prevent driving torque from increasing to enable high-speed actions including varying the position of a third arm for easy maintenance and control and reduced maintenance and control time by enabling the position of the third arm to be varied independently of driving of first and second arms, and disposing a third arm driving mechanism at the first or third arm. CONSTITUTION:A third arm driving mechanism is disposed on a frame 2 and a third arm 8 is driven using the mechanism of a parallelogram link 3', and a parallelogram link 2' is also employed in driving a second arm 7. The first 6, second 7 and third 8 arms can be independently subjected to position control and can be made to take free positions within an operating range that is preset to prevent interference between the arms, and the driving torque for the first and second arms 6, 7 can be reduced while high-speed actions including varying the position of the third arm 8 are made possible. The use of the parallelogram link mechanism which is highly rigid enables accuracy to be maintained over a long period.