A head unit includes: heads including a first-head and a second-head including respective flow channels, and a common flow channel member being stacked on the heads and including common flow channels communicating with the heads in common; flexible members including a first-flexible-member disposed between the first-head and the common flow channel member, and a second-flexible-member disposed between the second-head and the common flow channel member; and fixation members for fixing the common flow channel member, the first and second-heads, and the first and second-flexible-members together. The first-flexible-member establishes liquid-tight communication between a first-flow-channel and a first-common-flow-channel by being compressed in a stacking direction. The second-flexible-member establishes liquid-tight communication between a second-flow-channel and the first-common-flow channel by being compressed in the stacking direction. The fixation members include a first-fixation-member disposed between the first-flexible-member and the second-flexible-member in plan view.

An inkjet printhead includes a two-dimensional array of drop ejectors arranged as a plurality of columns, each column including a plurality of banks, and each bank including a plurality of groups that each include a plurality of drop ejectors. The drop ejectors in each group are substantially aligned along a first direction. The groups in each bank are spaced from each other along the first direction and are offset from each other along a second direction. The banks in each column are spaced from each other along the first direction and are offset from each other along the second direction. The columns are offset from each other along the second direction. The two-dimensional array has a width W along the first direction and a length L greater than W along the second direction. Each drop ejector includes a nozzle, an ink inlet, a pressure chamber and an actuator

A liquid ejecting head includes driving elements and electrodes each extending a second direction for ejecting liquid of pressure chambers through nozzles. The driving elements are classified into a first element group and a second element group. The electrodes are arranged along a first direction intersecting the second direction and are classified into a first electrode group electrically connected to the first element group, a second electrode group electrically connected to the second element group and a third electrode group not contribute to the ejecting liquid.

A single pass inkjet printer that utilizes a modular printing system with one or more self-contained printing modules, where each printing module is easy to remove and replace from a large printing machine, thus resulting in an overall system that is easy to service and maintain Each module is a self-contained printer including an ink supply, printhead drive electronics, and printhead assembly in order to provide one color or fluid of inkjet printing capability. Each module includes a precise three-point compliant self-aligning mount system to obtain accurate printhead positioning, and a unique integrated printhead tending system that includes a compact movable vacuum knife for cleaning the printheads, and a printhead capping station for sealing and protecting the printheads from the ambient environment when not in use.

A method for manufacturing a printing bar unit for a printing system includes the steps of providing a support bar having a plurality of primary mounting positions, providing a plurality of exchangeable printheads having a plurality of inkjet nozzles, and releasably mounting the printheads to the support bar. Preceding the step of releasably mounting the printheads to the support bar, a plurality of reference organs are connected at the primary mounting positions to the support bar and undergo an alignment finishing process for forming a plurality of accurate secondary mounting positions, and then in a subsequent step the printheads are releasably mounted to the secondary mounting positions on the reference organs. A dimensional tolerance of the secondary mounting positions on the reference organs relative to each other is more accurate than a dimensional tolerance of the primary mounting positions on the support bar relative to each other.

There is provided head system including: head and channel member. The head includes four manifolds each having: common channel extending in first direction and inlet connected to the common channel. The four manifolds include first to fourth manifolds. The channel member includes: first member having supply port, and second member. The channel member is formed with first to fourth supply channels extending between the supply port and the inlet of the first to fourth manifolds, respectively. In two of the four manifolds, the inlet is connected to end on first side of the common channel, and in remaining two of the four manifolds, the inlet is connected to end on second side of the common channel. Each of the third and fourth supply channels is formed in both the first and second members.

A liquid ejection head, including: a first head unit; a second head unit shifted with respect to the first head unit in both of a first direction in which nozzles of the head units are arranged and a second direction orthogonal to the first direction and disposed so as to overlap the first head unit in the second direction; and a first wiring member having flexibility and drawn from the second head unit in the second direction toward the first head unit, wherein the first wiring member includes a large-width portion on which a drive circuit is mounted and a small-width portion having a width in the first direction smaller than a width of the large-width portion in the first direction, and wherein the small-width portion passes through a space existing next to the first head unit in the first direction and extends in the second direction.

A liquid jet head includes: a nozzle plate including a nozzle array, the nozzle array including a plurality of nozzle holes each extending in a Z direction, the nozzle holes being arranged side by side in an X direction; a head chip disposed in a +Z direction with respect to the nozzle plate and including ejection channels communicating with the respective nozzle holes; a manifold disposed in a +Y direction with respect to the head chip, the manifold being configured to support the head chip by a face facing a −Y direction and including an ink flow path communicating with the ejection channels; and a drive board supported on the face facing the −Y direction of the manifold and electrically connected to the head chip.

A liquid ejection head includes a print element substrate including multiple ejection openings, pressure chambers, a common flow path, and pumps, the pumps being configured to circulate liquid between the common flow path and the pressure chamber; and a flow path member laminated to the print element substrate. The flow path member includes a supply flow path and a collection flow path, the supply flow path being configured to supply liquid to the print element substrate, and the collection flow path being configured to collect liquid that is not ejected. The supply flow path and the collection flow path have liquid connection with the same common flow path. A circulating pump generates a flow of liquid flowing in an order of the supply flow path, the common flow path, and the collection flow path, the circulating pump being provided at a position different from the print element substrate.

An ink-jet printer includes: a base material transport mechanism for transporting a base material along a transport path in a transport direction; an ink ejection head having a lower surface opposed to the transport path, and an ink ejection port for ejecting ink toward the transport path; and a base plate having a lower surface opposed to the transport path over the transport path, and a mounting hole open in the lower surface, the ink ejection head being mounted in the mounting hole. The base plate includes an air flow hole that is a though hole penetrating through the base plate. The air flow hole has an air outlet open in a location downstream of the ink ejection port in the lower surface. Air passing through the air flow hole is ejected from the air outlet toward the transport path.