In one example, a wedge shaped carriage to carry a printhead back and forth over a print substrate during printing.

An element substrate, comprises: a plurality of printing elements configured to discharge liquid; a plurality of first driving elements disposed in correspondence with the plurality of printing elements and configured to drive the plurality of printing elements; a plurality of heating elements configured to heat the element substrate; a plurality of second driving elements disposed in correspondence with the plurality of heating elements and configured to drive the plurality of heating elements; and a delay unit that delays timing of driving the plurality of second driving elements to drive the plurality of second driving elements at a predetermined time difference when driving the plurality of second driving elements simultaneously.

An ink jet system includes a head unit that includes a nozzle discharging ink, a pressure chamber communicating with the nozzle, and a drive element applying pressure fluctuation to the ink in the pressure chamber by supplying a drive pulse, an acquisition portion that acquires output information including one or both of first output information regarding the head unit and second output information regarding the ink used for the head unit, a first coupling portion that is communicably network-coupled to a server, a first output portion that outputs the output information to the server via the first coupling portion, a first input portion to which input information is input from the server via the first coupling portion, and a determination portion that determines a drive timing of the drive element based on the input information.

In an image forming apparatus (an ink jet printer 100), in a sub scanning direction, when an area in arrange of a nozzle at an end portion of a head (41) to a nozzle at a predetermined distance is set as a predetermined area, and a medium is transported in a certain amount by using the head (41), a scan portion, and a transport portion so as to form an image on medium sheet (10), the number of times of scanning for forming a dot array which is formed by using the nozzles included in the predetermined area is more than the number of times of the scanning for forming a dot array which does not use the nozzle in the predetermined area, and the number of times of the scanning for forming the dot array by using the nozzles included in the predetermined area is at least three times.

A printing apparatus includes a printing head including a nozzle configured to discharge a dot of a first size and a dot of a second size smaller than the first size, the dots being ink dots, and a control unit configured to control the printing head to print, on a printing medium, a test pattern for inspecting a state of ink discharge by the nozzle. The test pattern includes a first pattern element formed by a plurality of the dots of the first size and a second pattern element formed by a plurality of the dots of the second size. The control unit causes the printing head to print the test pattern where a number of the dots of the second size forming the second pattern element is greater than a number of the dots of the first size forming the first pattern element.

A printing apparatus includes a printing head including a nozzle configured to discharge a dot of a first size and a dot of a second size smaller than the first size, the dots being ink dots, and a control unit configured to control the printing head to print, on a printing medium, a test pattern for inspecting a state of ink discharge by the nozzle. The test pattern includes a first pattern element formed by a plurality of the dots of the first size and a second pattern element formed by a plurality of the dots of the second size. The control unit causes the printing head to print the test pattern where a number of the dots of the second size forming the second pattern element is greater than a number of the dots of the first size forming the first pattern element.

In a state where a distance from an ejection port surface of an ejection head to a predetermined position corresponds to a first distance, a period detection unit detects a first period from when ejection of a droplet from an ejection port is started until when a droplet detection unit detects the droplet, and in a state where the distance from the ejection port surface of the ejection head to the predetermined position is changed to a second distance by a change unit, the period detection unit detects a second period from when ejection of a droplet from the ejection port is started until when the droplet detection unit detects the droplet, the second distance being different from the first distance. A calculation unit calculates an ejection speed of the droplet, based on the first distance, the second distance, the first period, and the second period.

Described herein are bioprinters comprising: one or more printer heads, wherein a printer head comprises a means for receiving and holding at least one cartridge, and wherein said cartridge comprises contents selected from one or more of: bio-ink and support material; a means for calibrating the position of at least one cartridge; and a means for dispensing the contents of at least one cartridge. Further described herein are methods for fabricating a tissue construct, comprising: a computer module receiving input of a visual representation of a desired tissue construct; a computer module generating a series of commands, wherein the commands are based on the visual representation and are readable by a bioprinter; a computer module providing the series of commands to a bioprinter; and the bioprinter depositing bio-ink and support material according to the commands to form a construct with a defined geometry.

An ejection apparatus includes an ejection head configured to eject a droplet from an ejection port on an ejection port surface, a droplet detection unit configured to detect arrival of the droplet ejected from the ejection port at a predetermined position, an acquisition unit configured to acquire information about an ejection speed that is a moving speed of the droplet detected by the droplet detection unit, and a determination unit configured to determine subsequent timings for acquiring an ejection speed by the acquisition unit, based on the ejection speed acquired by the acquisition unit at a preceding timing of the subsequent timings.

There is provided an inkjet printing apparatus comprising a printhead in which a plurality of ejection ports that eject ink are formed, a carriage mounted with the printhead and reciprocated in a predetermined direction, a conveyance unit to convey a print medium by an ink droplet ejected from the printhead, a platen to support, at a printing position, the conveyed print medium, and an obtaining unit to obtain information regarding a distance from an ejection port surface of the printhead to the print medium at positions in the predetermined direction. The apparatus controls an ink ejection timing in accordance with the information regarding the obtained distance and information corresponding to the number of passes of printing, which is the number of times of moving the carriage to print the image in a unit area of the print medium.