Patent ID: 7990563

Claim:
A print unit comprising: a recording head which jets ink onto recording media which is sequentially conveyed in one of a normal conveyance direction and a reverse conveyance direction, wherein the recording head comprises a nozzle array in which a plurality of nozzles are disposed intersecting to the conveyance direction and a register which latches jetting data corresponding to each nozzle on each jetting timing of the nozzle array and outputs each jetting data to each nozzle; a page memory which memorizes image data to be output to a page of the recording medium in a data order corresponding to the normal conveyance direction, wherein the page memory divides the image data to be output to the page of the recording medium into a plurality of image data of one line to be printed on each jetting timing and stores the plurality of image data of one line in an order of the jetting timing, wherein each of the image data of one line is divided into a plurality of image data of one dot to be printed at each nozzle and is stored in an order of a disposition of the nozzles; a conveyance direction detection section for detecting if the conveyance direction is the normal conveyance direction or the reverse conveyance direction; and a control section which controls the recording head to jet ink based on the image data to be output to the page of the recording medium at the page memory, wherein the control section comprises a reading out section which memorizes the image data to be output to the page of the recording medium at the register as the jetting data in a order of storing the plurality of the image data of one line in the page memory, wherein each of the image data of one line is memorized at the register in a order of storing the plurality of image data of one dot in the page memory, in case when the detection section detects the conveyance direction as the normal conveyance direction; and memorizes the image data to be output to the page of the recording medium at the register as the jetting data in the order of storing the plurality of the image data of one line in the page memory, wherein each of the image data of one line is memorized in a reverse order to the order of storing the plurality of the image data of one dot in the page memory, in case when the detection section detects the conveyance direction as the reverse conveyance direction.