Robot having multi-joint arms movable in horizontal plane

A robot having multi-joint arms comprising a robot body, a cylindrical mount movable vertically of said robot body through a guide means and a slider means, a vertical threaded shaft rotatably journaled in said robot body, a connector means having one end being in threaded engagement with said threaded shaft and the opposite end fixedly connected to said cylindrical mount, a first drive motor provided in said robot body for rotating said vertical threaded shaft, thereby to vertically move said cylindrical mount along said vertical threaded shaft, a first arm having one end operatively connected to said cylindrical mount such that said first arm may be turningly moved in a horizontal plane, a second drive motor provided in said cylindrical mount to move said first arm, a second arm having one end operatively connected to the opposite end of said first arm such that said second arm may be turningly moved in a horizontal plane, a third drive motor provided in said cylindrical mount to move said second arm, a control R shaft rotatably mounted on a free end of said second arm, and a fourth drive motor provided in said cylindrical mount to rotate said control R shaft.