A print level information generating unit generates print level information representing the amount of ink to be applied to a predetermined area on a print medium. A print timing information generating unit generates print timing information indicating a timing, at which the ink is applied to the predetermined area. A print information combining unit outputs the print level information as the print information in a case where the amount of ink to be applied to the predetermined area is maximum or minimum. Moreover, the print information combining unit replaces a part of the print level information with at least a part of the print timing information so as to output, as the print information, information obtained by combining the print timing information and the print level information in a case where the amount of ink to be applied to the predetermined area is not maximum or minimum.

In accordance with an embodiment, an inkjet head comprises a counter, a plurality of comparators, a head drive signal generation section and a head main body. The counter counts a count value at a predetermined interval. The plurality of the comparators sets a comparative value obtained from the count value and an offset value if a first transmission start signal is input from a first device, and outputs a second transmission start signal to a second device if the count value becomes the comparative value. The head drive signal generation section outputs a head drive signal if the second transmission start signal is input. The head main body ejects an ink to a print medium if the head drive signal is input.

In an example implementation, a method of adjusting frame length in an inkjet web press includes measuring a time T1 between a first sensor sensing a first mark and a second sensor sensing a second mark, and measuring a time T2 between the second sensor sensing the second mark and the first sensor sensing a next first mark. The method includes adjusting a gap between printed frames when T1 does not equal T2.

In accordance with an embodiment, an inkjet head comprises a head section, a clock signal generator, a drive controller and a current measurement section. The head section applies a drive voltage to a wall surface of an ink chamber and ejects ink from the ink chamber. The clock signal generatorsends a clock signal to the head section. The drive controller stops the clock signal sent to the head section, and applies a predetermined drive voltage to the head section. The current measurement section measures a current flowing to the head section while the drive controller stops the clock signal sent to the head section.

An image forming apparatus includes: an extraction unit configured to extract an image for position detection from job image data; a first image forming unit configured to form the image for position detection on a recording medium; a second image forming unit disposed on a downstream in a feeding direction of the recording medium relative to the first image forming unit; a first detection unit configured to detect the image for position detection formed by the first image forming unit; and a determining unit configured to determine a correction amount of an image forming position of the second image forming unit based on a position of the image for position detection that is detected by the detection unit and a position of the image for position detection in the image data.

A printer printing an image on a print medium based on print data including print dot data for each of print lines. The printer includes a print head including heating elements arranged along a direction of the print lines, and a controller finding the number of print dots on each print line and determining a first or second control mode as a control mode of the heating elements for printing each print line based on the found number of print dots. In the first control mode, the heating elements are divided into first groups including two or more adjacent heating elements and are heated at a different timing. In the second control mode, the heating elements are divided into second groups including two or more heating elements with at least two thereof spaced apart and are heated at a different timing.

There is provided a printer including: a conveyance unit; a liquid jetting head including at least one nozzle array in which nozzles are arrayed; a carriage; a guide; a carriage moving unit; a memory; and a controller. The controller performs printing by performing scan printing operation and a conveyance operation multiple times repeatedly and adjusts jetting timings of the liquid jetted from the nozzles at positions in a scanning direction based on pieces of inclination information corresponding to the respective positions. In second or subsequent scan printing operation of the multiple times of scan printing operation, the controller delays or advances, based on the inclination information, the jetting timing in the second or subsequent scan printing operation relative to the jetting timing in scan printing operation immediately before the second or subsequent scan printing operation more greatly, as inclination of the at least one nozzle array increases.

A printer includes a printing head that includes a plurality of heating elements arranged in a first direction and a processor, wherein printing data representing an image to be printed on a printing medium are divided into a plurality of line data, each of the plurality of line data representing a corresponding line segment of the image, extending in the first direction, by a series of dots constituted of printing dots to be printed on the printing medium and non-printing dots that are not printed on the printing medium, and wherein, for each of the line data, the processor obtains distribution information of the printing dots in the line data, and sets an energizing time, during which the selected heating elements are energized continuously, or intermittently by pulses, to print the corresponding printing dots, in accordance with the distribution information of the printing dots in the line data.

A printing apparatus, including a conveyor, a liquid ejection head with nozzles, a carriage, a carriage movement mechanism, and a controller, is provided. The controller executes a printing operation including a parameter determining process and an ejection timing determining process. In the parameter determining process, a value to a correction parameter is determined. In the ejection timing determining process, ejection timing to eject liquid through the nozzles is determined based on the value to the correction parameter. In the ejection timing determining process, the controller determines the ejection timing by shifting the ejection timing to be at least one of later and earlier than a reference timing for a time length corresponding to the value to the correction parameter. In the parameter determining process, the controller provides a different value to the correction parameter for the scan-printing action in the second unit-printing process depending on the nozzle shift amount.

A fluid ejection device includes a fluid slot, a plurality of fluid ejection chambers communicated with the fluid slot, a plurality of drop ejecting elements one of each within one of the fluid ejection chambers, a plurality of fluid circulation channels each communicated with the fluid slot and one or more of the fluid ejection chambers, and a plurality of fluid circulating elements each communicated with one or more of the fluid circulation channels. The fluid circulating elements are to provide intermittent circulation of fluid from the fluid slot through the one or more of the fluid circulation channels and the one or more of the fluid ejection chambers.