The disclosure provides a method to construct and physically join near-net shaped structural building blocks into a composite part using an interfacial reaction-activation mechanism. Text orientation is estimated based on edges detected within the image, and the image is rotated based on the estimated orientation. First and second guide members for controlling the turning angle of the second turnable shaft are installed within the first turnable shaft. The watertight means of the phase inverting mechanism prevents invasion of moisture into inside the hollow chamber from outside the cabinet through the phase inverting mechanism.