Patent ID: 8276265

Claim:
An electronic component mounting machine that picks up an electronic component by suction and by suction nozzles from a plurality of part feeders placed side by side within a component feed part and that mounts the electronic component on a substrate positioned by a substrate positioning part, the machine comprising: a loading head on which the suction nozzles are provided in numbers and a head movement unit that moves the loading head between the component feed part and the substrate positioning part; and two rows of nozzles that are provided on the loading head and that includes at a predetermined nozzle arrangement pitch a plurality of nozzle shafts which have at their respective lower ends the suction nozzles and which are vertically movable, a nozzle elevation mechanism for individually actuating the nozzle shafts in a vertical direction, and a θ rotary drive mechanism that rotates the plurality of nozzle shafts around their axes, wherein the θ axis rotary drive mechanism has a θ-axis motor whose output shaft is coupled to a drive pulley, driven pulleys coupled to the respective nozzle shafts, a plurality of idlers interposed between the two rows of nozzles, and an endless driving belt that transmits rotation of the θ-axis motor to the driven pulleys; and wherein the driving belt is looped such that a drive surface having drive teeth is looped around the drive pulley and the driven pulleys and that the other side of the drive surface is guided by the idlers.