Coating system and head cleaning method

A coating system comprising:

• a head having a nozzle hole through which a coating material is dischargeable;
• a supply path coupled to the head to supply the coating material to the head;
• a discharge path coupled to the head to discharge the coating material that has not been discharged through the nozzle hole;
• a robot including a mover to move the head attached to the mover;
• a switching valve coupled to multiple coating material containers containing different types of coating materials, the switching valve to switch a first type of coating material to a second type of coating material, different from the first type of coating material, to be supplied to the supply path;
• a discharge valve to openably close the discharge path;
• and
• control circuitry configured to:
• control the head to openably close the nozzle hole to discharge the first type of coating material from the nozzle hole to perform a coating operation;
• open the discharge valve to discharge the first type of coating material to the discharge path, with the head attached to the mover, after completion of the coating operation;
• and
• control the switching valve to supply the second type of coating material to the supply path after completion of discharge of the first type of coating material to the discharge path.