Song I-Yeong(1619~1692), who is astronomy professor of Gwansanggam(bureau of astronomy), made armillary clock in 1669(10th year of king Hyunjong era). Armillary clock is a unique astronomical clock which combines armillary sphere, traditional astronomical instrument of Far Eastern, with the power mechanism of Western alarm clock. The clockwork part of this clock are composed of the going train, which is a power unit used the weight, and the time signal system in a wooden case. Also, the time signal system are composed the time-annunciator, strike-release ball-system, and striking train and displays the time by 12 different time signal cards and sound of bell. This clock has been shut down because of several components have been lost. This study is for understanding the working mechanism of each units and suggests its restoration process.