Devices include one or more inkjet printheads, a reusable jetting sheet that is adjacent to nozzles of the printheads, support structures (e.g., drive rollers) contacting the sheet, and a cleaning station contacting the sheet. The reusable jetting sheet includes an opening, that is at least as large as the sets of nozzles, and a jetting area spaced from the opening. The support structures are adapted to move the reusable jetting sheet relative to the sets of nozzles. The inkjet printheads are adapted to eject ink from at least some of the nozzles, through the opening, to print media when the opening is positioned adjacent to the sets of nozzles, to print on print media. The inkjet printhead is further adapted to eject ink from at least some of the nozzles to the jetting area when the jetting area is positioned adjacent to the sets of nozzles to perform maintenance jetting.

A recording device includes a recording head including a plurality of nozzle rows of a plurality of nozzles for ejecting a same color ink, a detector configured to detect, from among the plurality of nozzles, a defective nozzle having an ejecting defect, and a control unit configured to determine whether the recording head is in an error state, based on a detection result from the detector. The control unit determines that the recording head is in the error state when, among the plurality of nozzles having a specific positional relationship in which the nozzles are configured to compensate for each other's ejection, at least a predetermined number the nozzles, which is greater than one, is the defective nozzle.

A print module includes a printhead cartridge releasably engaged with a supply module. The supply module has an ink inlet module and an ink outlet module positioned on opposite external sidewalls of the body and flanking the body, each of the ink inlet and ink outlet modules having a respective ink coupling engaged with complementary inlet and outlet couplings of the printhead cartridge. The ink inlet and outlet modules each include a respective lever mechanism for slidably moving the ink inlet and outlet modules relative to the opposite external sidewalls of the body between a coupled position in which the supply module is fluidically coupled to the printhead cartridge and a decoupled position in which the supply module is fluidically decoupled from the printhead cartridge.

A print engine includes: a media support chassis having a plurality of guide rollers mounted between opposite sidewalls thereof, the plurality of guide rollers defining a curved media feed path; a plurality of spittoons, each spittoon being positioned between a neighboring pair of guide rollers and each spittoon having an upper guide portion; and a plurality of printheads, each printhead opposing a respective spittoon. The upper guide portion of each spittoon has an upstream leading edge sloped towards the media feed path and a downstream trailing edge sloped away from the media feed path.

Certain examples described herein relate to calibrating a cleaning element for a printhead. A print medium sensor is aligned with a nozzle plane of the printhead to detect displacement, during a print job, of a print medium out of the nozzle plane. Relative movement between the cleaning element and the printhead is enacted. During this movement, activation of the print medium sensor is detected. A reference position for the cleaning element is stored based on the detected activation.

An image forming apparatus includes: a line head including multiple ink jet nozzles arrayed in a line direction; a storage device; and a controller circuit configured to determine an image width, the image width being a width of an image to be formed in the line direction, mandatorily eject ink from an ink jet nozzle group before forming the image, the ink jet nozzle group including multiple ink jet nozzles used to form the image having the image width out of the multiple ink jet nozzles, and store the image width in the storage device as a mandatory ejection width.

A print engine includes: a media support chassis having a plurality of guide rollers mounted between opposite sidewalls thereof, the plurality of guide rollers defining a curved media feed path; a plurality of spittoons, each spittoon being positioned between a neighboring pair of guide rollers and each spittoon having an upper guide portion; and a plurality of printheads, each printhead opposing a respective spittoon. The upper guide portion at least partially intersects a common tangential plane defined between a neighboring pair of rollers, such that print media fed along the curved media path contact the rollers and upper guide portions of the spittoons.

A print engine includes: a media support chassis defining a curved media feed path; a maintenance chassis mounted on the media support chassis; a plurality of maintenance modules fixedly mounted between sidewalls of the maintenance chassis; a plurality of guide rails extending radially upwards from the maintenance chassis; a plurality of print module carriers, each print module carrier being slidingly received on respective parallel guide rails; a plurality of print modules releasably engaged with a respective one of the print module carriers; and a lift mechanism for radially raising and lowering the plurality of print module carriers relative to the maintenance chassis between a maintenance position a printing position.

A liquid jetting apparatus includes: a head which jets liquid supplied from a liquid tank; a memory which stores pieces of reference data; and a controller which estimates viscosity of the liquid in the liquid tank every time a predefined time passes. The controller acquires a total supply amount or cumulative supply amount of the liquid supplied from the liquid tank and a supply amount of the liquid per unit time within the predefined time, estimates a viscosity change amount of the liquid in the liquid tank based on the cumulative supply amount acquired, the supply amount per unit time acquired, and the pieces of reference data, and estimates the viscosity of the liquid in the liquid tank based on the viscosity change amount estimated and the viscosity of the liquid in the liquid tank at an initial timing point or a most-recent estimation timing point.

A printing apparatus includes a medium support unit having a support surface that supports at least a printing region of a medium, a medium accommodation unit configured to store a region of the medium that is not supported by the support surface, a head configured to eject a liquid onto the medium supported by the support surface, and a head moving unit configured to move the head. The medium support unit is configured not to move in a direction parallel to the support surface, and the head moving unit moves the head in a direction parallel to the support surface.