Apparatus for adjusting a head gap of ink-jet printer

An apparatus to adjust a head gap of an ink-jet printer. The apparatus includes a shaft rotatably disposed at a main frame and having an eccentric supporting shaft, a head assembly movably disposed on the shaft and having a head to provide ink to a printing medium, a motor to provide a driving force to rotate the shaft, a worm wheel connected to the supporting shaft to rotate in association with the supporting shaft, a rotation angle control unit to restrict a rotation angle of the worm wheel to restrict a range of a head gap between the head and the printing medium, and a clutch unit to selectively transmit the driving force of the motor to the worm wheel and prevent a transmission of the driving force from the motor to the worm wheel when the worm wheel is overloaded by the rotation angle control unit.