| 主权项 |
1. An inkjet printer comprising:
an inkjet head configured to eject ink onto a sheet being conveyed, the inkjet head comprising
a plurality of ink chambers isolated from each other by partition walls and arranged next to one another in a row,a plurality of nozzles communicating with the respective ink chambers and configured to eject the ink in the ink chambers, anda plurality of variable portions configured to selectively deform the partition walls in response to one of a drive signal having a normal waveform and a drive signal having a corrected waveform which increases an ejection amount and an ejection speed of the ink compared with an ejection amount and an ejection speed of the normal waveform, and to cause the ink to be ejected from the plurality of nozzles by changes in pressures in the ink chambers due to deformations of the partition walls; a driver configured to perform an ejection drive of each of the ink chambers by selectively supplying the drive signal having the normal waveform and the drive signal having the corrected waveform to the plurality of variable portions; a controller configured to divide the plurality of ink chambers into n+1 (n=1, 2, . . . ) groups each formed by taking ink chambers while skipping n ink chambers from among the plurality of ink chambers, and to drive the driver to perform the ejection drive of the ink chambers subjected to the ejection drive in units of the groups, and complete the ejection drive of the ink chambers subjected to the ejection drive in all the groups within one cycle including n+1 time slots corresponding to the respective groups; and an adjuster configured to adjust a distance between an ejection surface of the inkjet head and the sheet to be printed with the ink ejected from the nozzles, the ejection surface including openings of the nozzles, wherein, upon driving the driver to perform the ejection drive of each of the ink chambers subjected to the ejection drive, the controller is configured to
drive the driver to supply the drive signal having the normal waveform when a correction condition is not satisfied, anddrive the driver to supply the drive signal having the corrected waveform when the correction condition is satisfied, wherein the correction condition comprises
that at least one of the ink chambers arranged next to the ink chamber subjected to the ejection drive is not subjected to the ejection drive in an immediately preceding time slot,that both the ink chambers arranged next to the ink chamber subjected to the ejection drive in a same group are subjected to the ejection drive, andthat the distance between the ejection surface and the sheet is larger than a threshold value. |
