An image-decoding system with multi-run mechanism and method thereof are described. With the method thus structured, the ink jet head can be manufactured with excellent stability of preservation, while making it not only possible to position the ink discharge port and the energy generating element on the substrate of the ink jet head in high precision at low temperature for bonding but also, to implement high resistance to ink and heat after the adhesive has been cured. A first sidewall is disposed on the outer surface of the first housing member and extends along the insertion direction, perpendicular to the front wall. The first protocol is different from the second protocol. An apparatus and method are provided to optimize energy efficiency. The first and second gears are in constant meshed engagement with each other.