in detail with reference to the attached drawings in the present embodiment a serial printer equipped with an inkjet head having a detachable ink tank will be explained by way of example however the present invention is not limited to this but applicable to a so called line printer having a long recording head not executing a scan in a row direction 0020 fig1 is an outside perspective diagram of the serial inkjet printer being an example of a recording apparatus to which the present invention is applied in fig1 a guide shaft 103 slidably guiding a carriage 102 in a main scan direction is fixed to a chassis 114 of the printer a cartridge type recording head 101 detachably having the ink tank is exchangeably mounted on the carriage 102 a belt 104 acting as a driving transmission means is engaged to the part of the carriage 102 and put or wound on a pulley and a rotation axis of a carriage motor 105 acting as a driving means along the guide shaft 103 thus by driving the carriage motor 105 the carriage 102 equipped with the recording head 101 can be shifted in the main scan direction a recording sheet recording medium 115 fed from a sheet feed base 106 is conveyed toward a direction intersecting the main scan direction preferably a direction perpendicular.