Abstract: A combustion system using at least 90 wt % propylene glycol based liquid fuel includes a first fuel tank, a wick inserted in the first tank, a sensing unit configured to receive an activating signal and sense the liquid level of the propylene glycol based liquid fuel in the first fuel tank and send a fuel replenishment signal accordingly, a second fuel tank, a conduit system connected with the first and the second fuel tanks, and a drive unit connected with the conduit system and configured to receive the fuel replenishment signal so as to cause the propylene glycol based liquid fuel in the second fuel tank to replenish the first fuel tank through the conduit system as well as to cool the wick.

Abstract: An automatic shoe-lacing machine for securing a shoelace onto a shoe upper includes a jig unit, a robotic arm unit and a control unit. The jig unit permits the shoe upper to be disposed thereon. The robotic arm unit is disposed at the proximity of the jig unit. The robotic arm unit simultaneously holds and moves two tipping members of the shoelace for sequentially passing the tipping members through eyelets formed in the shoe upper. The control unit controls the movement of the robotic arm unit.

Abstract: An automatic shoe-lacing machine for securing a shoelace onto a shoe upper includes a jig unit, a robotic arm unit and a control unit. The jig unit permits the shoe upper to be disposed thereon. The robotic arm unit is disposed at the proximity of the jig unit. The robotic arm unit simultaneously holds and moves two tipping members of the shoelace for sequentially passing the tipping members through eyelets formed in the shoe upper. The control unit controls the movement of the robotic arm unit.