| 主权项 |
1. A printer performing printing while being moved on a print medium, comprising:
a recording head having a plurality of nozzles that discharge liquid droplets; two or more sensors each reading the print medium into an image of the print medium and calculating a total moving distance based on the image of the print medium; an instruction unit that instructs a timing for discharging the liquid droplets from one or more of the nozzles to perform the printing; a sensor position calculator that calculates a position of each of the sensors on the print medium relative to a predetermined initial position, based on the total moving distance calculated by each of the two or more sensors; a nozzle position calculator that calculates a position of each of the nozzles on the print medium relative to the initial position, based on the positions of the sensors calculated by the sensor position calculator; an acquisition unit that acquires image data of a specified area within an image to be printed, based on the position of each of the nozzles calculated by the nozzle position calculator; a determination unit that determines whether or not to discharge the liquid droplets from each of the nozzles, based on the position of each of the nozzles calculated by the nozzle position calculator and a position of each of image elements constituting the specified area within the image printed on the print medium according to the image data of the specified area acquired by the acquisition unit; a transmitter that transmits data of one or more of the image elements and information on one or more of the nozzles determined to discharge the liquid droplets to a controller that controls discharging of the liquid droplets, based on the timing instructed by the instruction unit and a determination result made by the determination unit; wherein the total moving distance is calculated from:
a rotary movement component specified in a rotation direction based on the initial position, represented by a rotation angle;parallel movement components each specified in longitudinal and transverse directions based on the initial position, represented by moving distances in the longitudinal and transverse directions, wherein the rotation angle is calculated prior to calculation of the moving distances, and the moving distances are calculated based on the rotation angle; and wherein the sensor position calculator firstly calculates a position of one of the sensors having a largest rotation angle, and then calculates positions of the other sensors based on the calculated position of the sensor having the largest rotation angle. |
