Mounting head of electronic component mounting apparatus

A mounting head of an electronic component mounting apparatus, comprising:

• a nozzle holder housing two or more suction nozzles that are configured to move vertically with respect to the nozzle holder, each of the suction nozzles comprising a cam follower provided at an upper portion thereof;
• a first rotation drive motor rotating a first rotation axis member in a normal direction and a reverse direction, the nozzle holder being fixed to the first rotation axis member and positioned around the first rotation axis member;
• a cylindrical cam member comprising a contact surface that is in contact with the cam followers of the suction nozzles, the contact surface of the cylindrical cam member being configured to provide at least two vertical positions in which the suction nozzles rest stably;
• and
• a second rotation drive motor disposed under the first rotation drive motor and rotating a second rotation axis member in the normal and reverse directions, the cylindrical cam member being fixed to the second rotation axis member and positioned around the second rotation axis member,
• wherein the first and second rotation axis members are configured to operate as rotors of corresponding rotation drive motors and to be coaxial so that a common axis of the first and second rotation axis members passes through the nozzle holder and the cylindrical cam member.