FIG. 6 is a perspective view showing a valve switching device, a raising/lowering device, suction nozzles, and nozzle holders of the mounting head provided with 12 nozzle holders.

FIG. 7 is a perspective view showing a different valve switching device, a different raising/lowering device, suction nozzles, and nozzle holders of the mounting head provided with 12 nozzle holders.

FIG. 8 is a perspective view showing the mounting head provided with 12 nozzle holders from the side on which a bulk feeder is provided.

FIG. 9 is a schematic diagram for describing stop positions of the suction nozzles by the rotation of a rotation holding body in the mounting head provided with 12 nozzle holders.

FIG. 10 is a schematic block diagram showing a control device of the electronic circuit component mounting system shown in FIG. 1.

FIG. 11 is a schematic plan view showing the relative positional relationship between tape feeders and an electronic circuit to be assembled in one of the mounting modules.

FIG. 12 is a flowchart showing a component reception order determining routine performed in a general control device of the electronic circuit component mounting system shown in FIG. 1.

FIG. 13 is a flowchart showing major parts of a component mounting routine performed in each of the mounting modules.