Abstract: A flow path structure includes: a substrate that includes a first surface and a second surface on a side opposite to the first surface; a supply port formed on the first surface; a plurality of discharge ports formed on the second surface; grooves that are formed on the first surface so as to extend in an X direction and communicate with the supply ports and with the plurality of discharge ports via through-holes formed on the substrate; and a sealing portion that is disposed on the first surface and seals each groove.

Abstract: A liquid ejecting head including a head main unit having L (L is an integer of 2 or more) nozzle rows parallel to one another in a first direction in which, for each nozzle row, in a case in which one side in a second direction that intersects the first direction at a predetermined angle in a range of 0 degrees to 90 degrees is the first side, the nozzle row furthest to the first side among the L nozzle rows does not have a nozzle positioned at a distance M or more further to the first side in the second direction than the nozzle furthest to the first side of a nozzle row neighboring in the second direction.

Abstract: A printhead assembly includes a one-piece printhead support. A printhead is supported on a head-land surface area of the printhead support. A trench in the printhead support surrounds the head-land surface area on a number of sides.

Abstract: A printhead assembly includes an ink distribution assembly including an ink distribution molding, the ink distribution molding including a plurality of first ducts; at least one printhead integrated circuit in fluid communication with the ink distribution assembly; and a rotary platen having at least three surface, each surface for providing one of a platen surface, capping portion, and a blotting portion. The ink distribution assembly further includes a plurality of second ducts acutely angled with respect to the plurality of first ducts, a plurality of transfer ports facilitating fluid communication between the plurality of first ducts and the plurality of second ducts, and a plurality of ink inlet ports facilitating fluid communication between an ink cassette and the plurality of first ducts.

Abstract: A liquid ejecting head unit includes a liquid ejecting head that ejects liquid through a nozzle formed in a nozzle surface, and a holding member to which the liquid ejecting head is attached. Further, in the liquid ejecting head unit, the holding member includes a holder that supports the liquid ejecting head in a predetermine direction which is different from a direction of the nozzle surface of the liquid ejecting head, and a base portion that sticks out from the holder to a side which is parallel to the predetermined direction.

Abstract: A printing apparatus including: a first nozzle group including a first and third nozzles which ejects a first liquid; and a second nozzle group including a second nozzle which ejects a second liquid, in which, when an ejection state of the liquid ejected from the one nozzle which belongs to the first nozzle group is abnormal, complementation is performed using complementation modes of a first complementation mode that increases the amount of a liquid to be ejected from the first nozzle instead of allowing the one nozzle to eject the liquid, a second complementation mode that increases the amount of the liquid to be ejected from the second nozzle instead of allowing the one nozzle to eject the liquid, and a third complementation mode that increases the amount of the liquid to be ejected from the third nozzle instead of allowing the liquid to be ejected from the one nozzle.

Abstract: An inkjet printhead assembly includes: a plurality of printhead segments arranged in two parallel rows in a staggered overlapping arrangement; and a slotted shield plate positioned relative to the printhead segments. Each of the printhead segments is exposed through the slotted shield plate.

Abstract: Provided is a liquid ejecting head which includes head bodies aligned in a direction of liquid ejection surface thereof, a flow-path member in which distribution flow path is provided to supply liquid to the head bodies, and flexible wiring substrates connected to the head bodies. The distribution flow path extends in the first direction. In addition, the flexible wiring substrates adjacent in the first direction overlap when viewed from the first direction. The distribution flow path is disposed in an area on one side with respect to the flexible wiring substrates, in a direction perpendicular to the first direction in the liquid ejection surface.

Abstract: Provided is a liquid ejecting head including a fixing plate which includes a first surface and a second surface on a side opposite to the first surface, a plurality of head units which are fixed to the second surface such that the head units can eject liquid to the first surface side of the fixing plate, and a case member which includes a wall portion that is formed to surround the head units and fixed to the fixing plate and which has a plurality of protrusion portions formed in a part of the wall portion, which is the portion facing the fixing plate.

Abstract: A method for creating a printed image with sections on an object using at least two inkjet print heads, includes forming the image of first and second image sections, in a y direction at a fixed angle different than 0° and 180° relative to an object conveying direction, printing print dots of the first and second sections using first and second heads having first and second inkjet nozzles with the sections partially overlapping in a region and potentially forming a light or dark line, defining first and second complementary nozzle fields of the first and second heads to be active for each column of dots in the y direction, and placing a joint between the fields in the overlap region in a light or dark area of the column for each column of dots, avoiding potentially disruptive light or dark lines at the joint and keeping the image without defect.

Abstract: There is provided an ink jet recording method for printing a pigment in which a pigment printing ink composition including at least pigment as a colorant is discharged from a nozzle opening as an ink droplet having an amount of the ink of the ink droplet of 9 ng or less with an average discharging speed V of 5 m/s or greater at a distance in the range of 0.5 mm to 1.0 mm in the direction from the nozzle opening to cloth, and whereby the pigment printing ink composition is adhered to the cloth.

Abstract: A printing apparatus includes: a supporting member which supports a medium; a transport device which transports the medium; first to fourth heads which eject first to fourth radiation curable type inks; a first irradiation section; a second irradiation section; a third irradiation section; and a fourth irradiation section which is arranged on the downstream side of the fourth head, in which the radiation rays respectively irradiated from the first irradiation section to the third irradiation section have a peak wavelength of 350 nm to 450 nm, and coloring materials included in the third ink and the fourth ink have higher absorption properties of the radiation rays with the peak wavelength than coloring materials included in the first ink and the second ink.

Abstract: An image formation apparatus includes a first discharge unit to form an image on a recording medium; and a second discharge unit including a nozzle line that discharges transparent droplets on the image formed on the recording medium. The second discharge unit moves in a first direction relative to the recording medium and the nozzle line has nozzles in a second direction orthogonal to the first direction. After the image formation, the second discharge unit discharges the transparent droplets from the nozzles spaced at m?1 nozzle intervals to form a row of dots in the second direction, and repeats the forming while moving to form m rows in the first direction, such that the dots in the rows are formed at m?1 nozzle intervals and positions of the dots between n-th and n?1-th rows are displaced together by one nozzle in the second direction.

Abstract: A liquid ejecting head unit includes: a liquid ejecting head having a liquid ejecting surface in which a nozzle opening for ejecting liquid is formed; a head fixing substrate which holds the surface sides opposite to the liquid ejecting surfaces of a plurality of liquid ejecting heads; and a height changing-fixing section which is provided between the head fixing substrate and the liquid ejecting head and can adjust a distance between the head fixing substrate and the liquid ejecting head, in which the height changing-fixing section is detachably fixed to the surface opposite to the liquid ejecting surface of the liquid ejecting head, and the height changing-fixing section and the head fixing substrate are detachably fixed to each other by screwing from the surface side opposite to a fixing surface of the head fixing substrate, to which the liquid ejecting head is fixed through the height changing-fixing section.

Abstract: A head unit is configured to be attached to a base and includes: a nozzle array group including a plurality of nozzle arrays each of which is defined by a plurality of nozzles that are arranged in a first direction and which are arranged in a second direction orthogonal to the first direction; and two correctors configured to adjust an angle of the plurality of nozzle arrays with respect to the base, one of the correctors disposed outside of the nozzle array group in the second direction.

Abstract: A printhead substrate comprising a plurality of printing portions and a plurality of ink supply ports, wherein the plurality of printing portions are divided into a plurality of groups, and the plurality of ink supply ports are arranged so as to correspond to the plurality of groups respectively, the printhead substrate also comprises a plurality of first voltage wiring portions provided in correspondence with the plurality of groups, and each first voltage wiring portion includes a first wiring pattern configured to connect the first terminals of the respective printing portions in the corresponding group with each other, and a second wiring pattern connected to the first wiring pattern and arranged between an ink supply port in the corresponding group and its neighboring ink supply port.

Abstract: A liquid ejecting head including a head main unit having L (L is an integer of 2 or more) nozzle rows parallel to one another in a first direction in which, for each nozzle row, in a case in which one side in a second direction that intersects the first direction at a predetermined angle in a range of 0 degrees to 90 degrees is the first side, the nozzle row furthest to the first side among the L nozzle rows does not have a nozzle positioned at a distance M or more further to the first side in the second direction than the nozzle furthest to the first side of a nozzle row neighboring in the second direction.

Abstract: An inkjet printer includes: a replaceable ink cassette adapted for use in the printer, the ink cassette having an ink reservoir containing a respective ink; and an ink distribution assembly in fluid communication with the ink cassette. The ink distribution assembly includes: an ink distribution assembly having an ink distribution molding, which includes a plurality of first ducts extending substantially along its length; a plurality of printhead chips in fluid communication with the ink distribution assembly; and a laminated stack for receiving ink from the ink distribution molding. An uppermost inlet layer of the laminated stack has a plurality of ink inlet holes in fluid communication with the first ducts via a plurality of second ducts defined in the ink distribution molding, wherein the second ducts are not parallel with the first ducts.

Abstract: Precise positioning of a film used to seal an electrical connection on a liquid ejecting head is made possible. Specifically, positioning is conducted in a state in which part of the film is held to a finger by suction. Next, the finger is moved downward while in the positioned state, and part of the film is pressed against a wiring board. With part of the film fixed to the wiring board in this way, a sealing resin flows while being covered by the film. Consequently, shifting of the position of the film as the sealing resin flows may be prevented. As a result, it becomes possible to conduct covering with the film in a precisely positioned state.

Abstract: A printer assembly includes: a housing having referencing slots defined in opposite sidewalls; a stop positioned towards a lower end of each referencing slot; a print bar carriage slidably received within the housing; and a lift mechanism for lifting the print bar carriage relative to the housing. The print bar carriage includes: a chassis; a printhead supported by the chassis; and a pair of lugs, each lug being slidably received in a respective referencing slot of the housing. Each stop has a datum surface which defines a printing position of the print bar carriage, the print bar carriage being in the printing position when each lug is in abutting engagement with a respective datum surface.

Abstract: An ink supply system for an ink jet printer, particularly a continuous ink jet printer, has a manifold assembly of two parts that are brought together at interfacing surfaces. At least one of the surfaces has a plurality of ink flow channels for conveying ink around an ink circuit between components. The other of the interfacing surfaces is configured to close and seal the channels. A plurality of ports is provided in fluid communication with the channels, the circuit components being connectable to the ports. The manifold assembly provides for a compact and neat arrangement free of many tubes and pipes. The lower number of connections significantly reduces the risk of leakage.

Abstract: A printer assembly includes a housing having a pair of opposite first and second sidewalls, the first sidewall having a vertical guide slot; a shaft rotatably mounted between the sidewalls; pinions fixedly mounted at either end of the shaft; a print bar carriage slidably received within the housing; and a drive motor for rotating the shaft and lifting the print bar carriage. The print bar carriage includes: a chassis; first and second racks engaged with respective pinions to define a rack-and-pinion lift mechanism; first bearings rotatably mounted at a first side of the chassis, each first bearing being received in the guide slot; and a printhead supported by the chassis. During sliding movement of the print bar carriage, the first bearings travel within the guide slot and bear against opposite guide surfaces to constrain rotational movement of the print bar carriage.

Abstract: Various configurations of print head die are described. In an example, a first print head die has first print structures disposed along a major dimension thereof perpendicular to the media path, the first print structures including a leading print structure with respect to the media path. A second print head die independent of the first print head die has second print structures disposed along a major dimension thereof perpendicular to the media path, the second print head die being staggered with respect to the first print head die along the media path, the second print structures including a leading print structure with respect to the media path. An extent between respective leading print structures of the first and second print head dies is between a minimum value and a maximum value computed from a function of expected variation in position of the media and maximum allowable dot placement error for the first and second print structures.

Abstract: Disclosed are devices and methods where a distance between nozzle arrays is equal to a substrate advance distance corresponding to at least one complete turn of a rotating drive body.

Abstract: An inkjet printhead assembly includes: an elongate ink supply structure having a plurality of longitudinally extending ink supply channels corresponding to a plurality of different colored inks and a plurality of outlet openings; and a plurality of individual printhead modules arranged along a length of the ink supply structure. Each printhead module includes: a carrier having a plurality of inlets for receiving ink from a respective set of the outlet openings, a mounting surface having a plurality of ink supply slots defined therein and a plurality of converging walls extending from the inlets towards the ink supply slots, the converging walls defining a plurality of converging ink galleries for supplying the plurality of different colored inks. A printhead segment is bonded to each mounting surface, the printhead segment receiving the different colored inks from the plurality of ink supply slots.

Abstract: A printer and a method of printing by depositing liquid droplets (26) onto a substrate (12), wherein a line is printed in a printing direction (B), wherein the droplets (26) forming the line are continuously printed wet-on-wet, and wherein, at least in a middle part of said line, the droplets (26) are printed according to a regular droplet pattern, and wherein, at least in one end part of the line, at least an outermost droplet (26) of the line is printed deviating from the regular droplet pattern, thereby adapting the continuously wet-on-wet printed line for compensating for ink flow behavior which causes deviation from the image to be printed.

Abstract: A fluid applicator mounting device includes a main body to removeably receive a fluid applicator module. The main body includes a common fluid channel having a main input port, a main output port, a supplemental input port to provide fluid to the fluid applicator module, and a supplemental output port to output fluid from the fluid applicator module. The fluid applicator mounting device also includes an input fm member disposed inside the common fluid channel and arranged proximate to the supplemental input port to guide fluid to the fluid applicator module. The fluid applicator mounting device also includes an output fin member disposed inside the common fluid channel and arranged proximate to the supplemental output port to guide fluid from the fluid applicator module away from the supplemental output port.

Abstract: A recording apparatus includes a movable belt and a recording mechanism. The movable belt is configured and arranged to convey a recording medium. The recording mechanism is configured and arranged to record onto the recording medium. The movable belt has a mark serving as a reference for when the recording medium is being set thereon.

Abstract: A controller is configured to determine nozzles to be used for ejection in nozzle arrays in a upstream head block by selecting endmost nozzles from nozzles in a region of the upstream head block overlapping a downstream head block so that the endmost nozzle of the nozzle array located more downstream is closer to a center of the upstream head block, and determine nozzles to be used for ejection in nozzle arrays in the downstream head block by selecting endmost nozzles from nozzles in a region of the downstream head block overlapping the upstream head block so that the endmost nozzle of the nozzle array located more upstream is closer to a center of the downstream head block.

Abstract: A liquid jetting apparatus includes: a head unit including a liquid jetting head, a regulating member arranged to sandwich the head unit from a nozzle array direction, a restriction mechanism configured to restrict the head unit from displacement in an orthogonal direction perpendicular to the nozzle array direction, and a landing position correction mechanism configured to correct position of landing the liquid jetted from the plurality of nozzles onto the medium in the orthogonal direction. The restriction mechanism restricts a portion of the head unit inside of outmost nozzle arrays in the orthogonal direction.

Abstract: A pagewidth printhead assembly for an inkjet printer includes: a plurality of channels for distributing the ink along a length of the printhead assembly; a plurality of printhead integrated circuits; and an ink distribution member upon which the printhead integrated circuits are fixed and which distributes ink from the channels to the printhead integrated circuits. The ink distribution member has a plurality of ink supply holes and a plurality of ink supply conduits defined in a surface thereof and the printhead integrated circuits are fixed to the ink distribution member via a bonding film. The bonding film includes a plurality of through-holes coinciding with the ink supply holes and end portions of the ink supply conduits.

Abstract: In accordance with an embodiment, an ink-jet printer includes a first black record head, a second black record head, a color record head, a black maintenance unit, a color maintenance unit and a controller. The black maintenance unit configured to maintain the first black record head. The color maintenance unit configured to maintain the second black record head and the color record head. The controller executes the maintenance of the black maintenance unit and the maintenance of the color maintenance unit at different timings.

Abstract: A liquid ejection head includes an ejection surface having a plurality of ejection opening sets each of which consists of at least two ejection openings adjacent to each other in a given direction. A straight line defined to connect between centers of the respective at least two ejection openings is parallel with the ejection surface and is inclined with respect to the given direction and a perpendicular direction that is perpendicular to the given direction. The straight line defined in one of each adjacent two of the ejection opening sets, which are adjacent to each other in the given direction, and the straight line defined in another of the each adjacent two of the ejection opening sets, are inclined with respect to the perpendicular direction, in respective directions opposite to each other. Also disclosed is a liquid ejection recording device including the liquid ejection head.

Abstract: A printhead assembly includes an ink distribution assembly including an ink distribution molding, the ink distribution molding including a plurality of first ducts; at least one printhead integrated circuit in fluid communication with the ink distribution assembly; and a rotary platen having at least three surface, each surface for providing one of a platen surface, capping portion, and a blotting portion. The ink distribution assembly further includes a plurality of second ducts acutely angled with respect to the plurality of first ducts, a plurality of transfer ports facilitating fluid communication between the plurality of first ducts and the plurality of second ducts, and a plurality of ink inlet ports facilitating fluid communication between an ink cassette and the plurality of first ducts.

Abstract: A page-width array printing device includes a page-width array printing mechanism including at least one page-width array printing module. The page-width array printing module includes a printing platform, a first page-width array printing unit and a second page-width array printing unit. The first page-width array printing unit includes a plurality of first inkjet cartridges. The second page-width array printing unit includes a plurality of second inkjet cartridges. The first page-width array printing unit and the second page-width array printing unit are in parallel with each other. The first inkjet cartridges and the second inkjet cartridges are staggered and independently and detachably disposed on the printing platform. Each of the first inkjet cartridges and the second inkjet cartridges includes an inkjet chip. The inkjet chip includes four ink supply channels and a plurality of nozzles so as to perform a monochromatic or polychromatic page-width array printing operation.

Abstract: An ink for an ink-jet recording apparatus contains water, a pigment, a resin, 1,3-propanediol, and an organic solvent. The resin has a weight-average molecular weight of 30,000 to 150,000. The content of the resin is 1.5% to 6.0% by mass with respect to the mass of the ink. The total content (P+Q) of the content of the glycerol (P) and the content of the 1,3-propanediol (Q) in the ink is 15% to 40% by mass with respect to the mass of the ink. The mass ratio (P/Q) is 0.25 to 1.00.

Abstract: A liquid ejection head includes a plurality of ejection members, each having an ejection port for ejecting liquid and a liquid chamber for supplying liquid to the ejection port, a base substrate carrying the plurality of ejection members arranged thereon, the base substrate being provided with a common flow channel for supplying liquid to the plurality of liquid chambers, and a plurality of branch ports each allowing the common flow channel to communicate with the plurality of liquid chambers. Each of the branch ports is provided with a notch portion at an upstream side thereof as viewed in the flow direction of liquid flowing through the common flow channel.

Abstract: A liquid ejection head includes a plurality of ejection members, each having an ejection port for ejecting liquid, an energy generating element for generating energy to be utilized to eject liquid from the ejection port, a liquid chamber for storing liquid to be supplied to the ejection port and a heater, and a base substrate bearing the plurality of ejection members arranged thereon and having a common flow channel for supplying liquid to the plurality of liquid chambers. The common flow channel communicates with the liquid chambers by way of respective branch ports and each of the branch ports is provided with a notch portion at the upstream side thereof as viewed in the flow direction of liquid flowing through the common flow channel.

Abstract: A printing apparatus comprising, a printhead including an element array in which a plurality of printing elements are arrayed, scanning unit configured to reciprocally scan the printhead, driving unit configured to time-divisionally drive the printing elements, conveyance unit configured to convey a printing medium, and setting unit configured to set a driving order, wherein the conveyance unit performs a first conveyance operation of conveying the printing medium by a conveyance amount which is an integer multiple of a width of the group of the time-divisional driving, and a second conveyance operation of conveying the printing medium by a conveyance amount which is not an integer multiple of the width of the group, and the setting unit sets the driving order in the time-divisional driving for each scan based on the conveyance amount by the conveyance unit.

Abstract: When an image is recorded using a multichip recording head including a plurality of chips each having a plurality of nozzle arrays, a change in image density can occur due to a registration error between chips in an overlapping part where two chips are connected. To suppress the change in image density, input image data is distributed to two chips such that there are dots overlapping each other between the two chips in the overlapping part.

Abstract: An image processing apparatus is provided that is capable of very accurately and efficiently reducing uneven color caused by variation in ejection characteristics among nozzles that eject ink and that occurs in a color image that is formed by mixing a plurality of different kinds of ink. A patch is printed by ejected ink from a plurality of nozzles, a region is specified so as to perform color correction in a test color image that is printed on a printing medium, a plurality of different color correction processing is performed on color signals that correspond to a color correction region, a plurality of color correction patches are printed, a color correction patch to be used is selected from among the plurality of different color correction patches and table parameters that correspond to the nozzles are created based on the selected color correction processing.

Abstract: A method includes moving an assembly of printheads with a bidirectional lateral motion. A direction of the lateral motion is substantially perpendicular to, and the lateral motion is concurrent with, a longitudinal motion of a substrate relative to the printhead assembly. Nozzles of the printheads are arranged in two rows that are oriented substantially parallel to the direction of the lateral motion. The longitudinal motion and the lateral motion are coordinated such that a nozzle in one of the rows and a nozzle in the other of the rows trace a common path on the substrate.

Abstract: Inkjet printing methods are provided that deflect and guide a condensation reducing airflow between a printing module and a receiver without disrupting inkjet drop placements.

Abstract: In a method to execute a pause in an ink printing system printing operation in which a printing substrate web is printed with print bars having print heads, with aid of a take-up roller moving the printing substrate web at printing speed past the print bars in a transfer printing zone in order to generate print images. Upon triggering the pause, a strain state of the printing substrate web is measured at a beginning of the pause and stored as a desired strain state. During the pause, the strain state of the printing substrate web is measured as a real strain state at selectable points in time, and the real strain state is compared with desired strain state. Given a deviation of the real strain state from the desired strain state, at the selectable points in time the take-up roller is controlled so that the strain state of the printing substrate web assumes the desired strain state at the beginning of the pause.

Abstract: A printing system including a staggered inkjet printhead including at least two inkjet nozzle arrays arranged along first and second print lines in an alternating pattern, wherein the inkjet nozzle arrays along a particular print line alternate with non-printing regions. A media guide including first and second rollers is used for guiding receiver media along a media path past the first and second print lines of the inkjet printhead. A center roller having a contoured media guide surface is positioned between the first and second rollers for guiding the recording media along the media path between the first and second print lines, wherein the diameter of the center roller is smaller for portions of its length corresponding to the inkjet nozzle arrays of the first print line than it is for at least some portion of its length corresponding to the non-printing regions of the first print line.

Abstract: A printing system including a staggered inkjet printhead including at least two inkjet nozzle arrays arranged along first and second print lines in an alternating pattern, wherein the inkjet nozzle arrays along a particular print line alternate with non-printing regions. A media guide including first and second rollers is used for guiding receiver media along a media path past the first and second print lines of the inkjet printhead. A center roller having a contoured media guide surface is positioned between the first and second rollers for guiding the recording media along the media path between the first and second print lines, wherein the diameter of the center roller is smaller for portions of its length corresponding to the inkjet nozzle arrays of the first print line than it is for at least some portion of its length corresponding to the non-printing regions of the first print line.

Abstract: A printing system including a staggered inkjet printhead including at least two inkjet nozzle arrays arranged along first and second print lines in an alternating pattern, wherein the inkjet nozzle arrays along a particular print line alternate with non-printing regions. A media guide including first and second media guide surfaces is used for guiding receiver media along a media path past the first and second print lines of the inkjet printhead. At least one of the media guide surfaces is contoured such that it is closer to the staggered inkjet printhead along portions of the associated print line that correspond to the associated inkjet nozzle arrays than it is for at least some portion of the associated print line that corresponds to the non-printing regions.

Abstract: A printing system including a staggered inkjet printhead including at least two inkjet nozzle arrays arranged along first and second print lines in an alternating pattern, wherein the inkjet nozzle arrays along a particular print line alternate with non-printing regions. A media guide including first and second media guide surfaces is used for guiding receiver media along a media path past the first and second print lines of the inkjet printhead. At least one of the media guide surfaces is contoured such that it is closer to the staggered inkjet printhead along portions of the associated print line that correspond to the associated inkjet nozzle arrays than it is for at least some portion of the associated print line that corresponds to the non-printing regions.

Abstract: A liquid ejection device may include a liquid ejection head, a conveyor mechanism, a liquid discharging device, and a control device. The control device may be configured to determine a dimension of a recording medium, and determine one or more first ejection nozzles of the liquid discharging device, which correspond to an edge of the recording medium, based on the dimension. The control device may be further configured to control the liquid discharging device to perform a liquid discharging process after the liquid ejection head records an image onto the recording medium, wherein in the liquid discharging process, an amount of liquid discharged from each of the one or more first ejection nozzles is larger than an amount of liquid discharged from each of one or more second ejection nozzles, which correspond to a more inward area of the recording medium than an area corresponding to the one or more first ejection nozzles.

Abstract: A printhead is provided having an elongate support having a plurality of internal webs protruding from a base section to define a plurality of parallel fluid supply channels, a shim supported by the support and defining a plurality of rows of openings through which fluid from respective supply channels is supplied, and a plurality of elongate printhead modules supported serially on the shim. Each module defines a plurality of fluid supply passages through which fluid passes to fluid ejection nozzles from respective rows of the openings. Either end of each module defines complementary formations such that adjacent modules nest together.