Insert molding apparatus

An insert molding apparatus comprising:

• a lower mold including a seating part on which an insert member including a through-hole is seated;
• an upper mold mounted on the lower mold and configured to receive the insert member seated on the seating part;
• and
• a first fixing part including:
• a first head provided in the lower mold and inserted into the through-hole of the insert member when the insert member is seated, and
• a first drive unit configured to move the first head,
• wherein the first drive unit is moved to adjust a length by which the first head is inserted into the through-hole,
• wherein the first drive unit includes:
• a drive gear;
• a driven gear engaged with the drive gear and including:
• a first surface, and
• a second surface facing away from the first surface and having a step area concavely formed from at least a partial area of the first surface toward the second surface;
• a shaft mounted on the second surface of the driven gear and connected with the first head;
• and
• a support part brought into contact with the first surface of the driven gear and configured to support the driven gear, and
• wherein a contact point between the support part and the first surface is changed based on rotation of the driven gear, and the first head is moved based on the contact point.