Sealant applying apparatus and sealant applying method

A sealant applying apparatus comprising:

• a fastener rotating unit to support a fastener to be rotatable around a central axis of the fastener;
• and
• a sealant discharging unit to discharge a sealant to apply the sealant to the fastener,
• wherein the fastener rotating unit comprises:
• a first base configured to support a second base, a fastener axial feeder and the sealant discharging unit;
• the second base configured to support a first holding member and a second holding member;
• the fastener axial feeder disposed on the first base to move the second base in a direction parallel to the central axis of the fastener;
• and
• the first holding member and the second holding member configured to hold the fastener to be rotatable and arranged on a same straight line parallel to a Z-axis so as to face each other, the first holding member being arranged under the second holding member, and
• the first holding member is installed to the second base to be exchangeable,
• wherein the sealant discharging unit comprises:
• a sealant cartridge configured to hold and discharge the sealant;
• and
• a discharge punch configured to be pushed into the sealant cartridge, and wherein the fastener axial feeder comprises:
• a linear motion guide for guiding the second base;
• and
• a cylinder for moving the second base along the linear motion guide.