Here is a 4-axis robot capable of maintaining high-speed performance continuously. DENSO’s HSR four-axis SCARA robot is available with 480, 550 and 650 mm reaches. It has a repeatability of ±0.01 to ±0.12 mm. The max payload is 8kg.
Such robots are ideal for high-speed, high-precision pick & place and packaging processes. More information is available here.