Abstract: In an inkjet printer, a method for of compensating for defects in printed images identifies a cross-process direction location of a defect in a printed image and a candidate inkjet corresponding to the location of the defect. The method modifies the operation of the candidate inkjet to form a second ink image. The method identifies a second inkjet that actually formed the first image defect in response to identifying a second defect in the second ink image located proximate to the first defect. The method enables identification and compensation of inoperable inkjets when image data do not correspond perfectly to inkjets in the printer.

Abstract: A density variation correction method for a printing system includes printheads in at least one linehead printing a test block pattern on a print media. A density variation trace is produced for each printed test block in the test block patterns by capturing an image of each test block and averaging pixel data in a transport direction. The density variation traces associated with a known print density represented in the test block pattern are compared with a respective reference density value. A determination is made as to whether there is a difference between each density variation trace and the respective reference density value. If there is a difference, the density variation trace is adjusted to match the reference density value. The method can be repeated for all of the known print densities represented in the test block pattern and for all of the lineheads in the printing system.

Abstract: A liquid ejection apparatus includes: a conveying mechanism, a first head for ejecting a first liquid; a second head for ejecting a second liquid for coagulating or precipitating components of the first liquid, and a controller. A pair of second ejection openings of the second head are arranged side by side. The second liquid is to be ejected respectively from the pair of second ejection openings at different timings onto a pair of unit areas arranged side by side. The controller controls the second head so as to reduce an amount of the second liquid ejected from at least one of the pair of second ejection openings, when an amount of the second liquid to be ejected from one of the pair of second ejection openings at an earlier one of the different timings is equal to or larger than a first predetermined value.

Abstract: An inkjet image forming apparatus and a method to control the same to correct characteristics of a plurality of print heads of the apparatus to have uniform characteristics includes a plurality of test patterns printed according to the timing of printing of dots through a row of odd nozzles and a row of even nozzles of each of the plurality of print heads and information of the drive timing corresponding to a brightest test pattern of the printed test patterns is stored. When a normal print operation is performed, a different drive timing is applied to each of the plurality of print heads based on the stored information, thereby compensating for the difference between the one or more characteristics of the print heads.

Abstract: When a gradation mask is used to distribute image data to be recorded by overlapping portions in an overlapping head, color unevenness is generated in an image recorded by the overlapping portions due to a displacement in impact positions caused by an assembly error. As a result, accurate colorimetric measurement of patches recorded by the overlapping portion cannot be performed. To solve such a problem, a distribution ratio by which the image data is distributed to the overlapping portions is set to be approximately constant when recording a test pattern for performing color correction, as compared to when normally recording the image.

Abstract: A method of compensating for a dead nozzle in a stationary pagewidth printhead. The method includes the steps of: (i) identifying the dead nozzle; (ii) selecting a functioning nozzle in a same nozzle row as the dead nozzle; and firing ink droplets from the selected functioning nozzle at a primary dot position associated with the dead nozzle.

Abstract: A data processing device that processes image data to be supplied to a recording head is provided. The device includes a first storage section configured to store image data for at least a single line; and a processor that reads image data corresponding to each of discharge nozzles of each of discharge groups from the image data of a single line stored in the first storage section and causes the read image data to be stored in a continuous storage region of a second storage section for storing image data to be supplied to the recording head.

Abstract: In an inkjet printer, a method for of compensating for defects in printed images identifies a cross-process direction location of a defect in a printed image and a candidate inkjet corresponding to the location of the defect. The method modifies the operation of the candidate inkjet to form a second ink image. The method identifies a second inkjet that actually formed the first image defect in response to identifying a second defect in the second ink image located proximate to the first defect. The method enables identification and compensation of inoperable inkjets when image data do not correspond perfectly to inkjets in the printer.

Abstract: An object of this invention is to increase the transfer rate of image data from a host computer to a printing apparatus. To achieve this object, a printing apparatus which divides the printing area in the printhead scanning direction into a plurality of regions and prints in each divided region in order to print by scanning the printhead on the printing medium includes a conversion circuit which rearranges image data that is transmitted from the host computer and arranged in a direction perpendicular to the data arrangement of the printhead, into image data in the same horizontal direction as the data arrangement direction of the printhead.

Abstract: An inkjet image forming apparatus includes: a liquid ejection head having an ejection surface in which a plurality of nozzles are arranged two-dimensionally; a scanning device which conveys at least one of the liquid ejection head and an image formation receiving medium on which liquid ejected from the plurality of nozzles is deposited, to cause relative movement between the image formation receiving medium and the liquid ejection head in a first direction; and a member which vibrates at a fixed frequency that is independent of a speed of the relative movement caused by the scanning device in such a manner that relative vibration is caused between the image formation receiving medium and the plurality of nozzles, wherein when vp represents a relative scanning speed produced by the scanning device in forming an image on the image formation receiving medium by the relative movement and droplet ejection from the liquid ejection head, fv represents the fixed frequency, and OSy represents an offset distance in the

Abstract: An ink for ink-jet recording apparatuses includes water, a pigment dispersion, a humectant, and a penetrating agent. The ink includes glycerin of from 5% to 9% by mass and 1,3-propanediol and/or 1,4-butanediol of from 30% to 45% by mass as the humectant. The ink also includes a C1-C4 monoalkyl ether of polyhydric alcohol of from 2.0% to 4.5% by mass as the penetrating agent.

Abstract: An image processing method of creating image data for forming an image on a recording medium by ejecting liquid droplets from a plurality of nozzles of a recording head onto the recording medium while causing relative movement of the recording medium and the recording head, includes: a correction coefficient storage step of determining correction coefficients for ejection failure correction based on difference of landing interference patterns of a plurality of types, and storing the correction coefficients for ejection failure correction according to the landing interference patterns, in a storage unit; an ejection failure nozzle position information acquisition step of acquiring ejection failure nozzle position information and a correction processing step of performing a correction calculation on input image data using a corresponding correction coefficient obtained by referring to the correction coefficients for ejection failure correction according to the ejection failure nozzle position information.

Abstract: A recording system for relatively easily and rapidly performing a registration adjustment in a recording device having a plurality of recording units which record divided recording images on the same recording medium. The recording system causes each of recording units (108A-108F) to record a registration adjustment pattern. Based on the recorded pattern, an inter-unit adjustment that is a registration adjustment among the plurality of recording units and an intra-unit adjustment that is a registration adjustment among the plurality of recording heads in each recording unit are performed.

Abstract: According to the present invention, there is disclosed an image forming apparatus comprising a constitution driven/controlled independently for each recording head. The apparatus rewrites image data or parameters or changes a driving voltage at a desired timing, and realizes a uniform or appropriate density of an image formed by control of an ink spout amount based on a temperature detection signal of the recording head detected by a temperature detection unit disposed in each recording head. The apparatus is capable of remarkably narrowing a mutual conveying interval among a plurality of conveyed recording mediums.

Abstract: A fluid ejecting apparatus includes a nozzle row in which a plurality of nozzles that eject fluid onto a medium are arranged, a first movement unit that displaces a relative position between the medium and the nozzle row, and a control unit that forms a plurality of dot-lines by repeating a fluid ejection operation in which fluid is ejected so as to form a dot-line, such that a maximum time between when one of the adjacent dot-lines in the plurality of dot-lines is formed to when the other of the adjacent dot-lines is formed is reduced.

Abstract: A circuit apparatus includes an output circuit that outputs a signal to a host apparatus via a bus, and an output control circuit that controls the output circuit. The output circuit has a first conductive transistor provided between an output node and a first power source node, and a second conductive transistor provided between the output node and a second power source node. In a first output mode, the output control circuit controls one of the first conductive transistor and the second conductive transistor to go to off and controls the other transistor to go to on/off, whereas in a second output mode, the output control circuit controls the first conductive transistor to go to on and the second conductive transistor to go to off or vice versa.

Abstract: An image forming apparatus includes: a recording head having plural sub-heads, the sub-heads each including plural nozzles, each of the plural nozzles within a sub-head ejecting liquid droplets at the same time with respect to a medium on which an image is drawn, and the sub-heads being arranged in a width direction of the medium; a setting unit; and a rotation unit. The setting unit uses a timing when a predetermined sub-head of the plural sub-heads ejects liquid droplets as a reference to set timings when sub-heads other than the predetermined sub-head eject liquid droplets. The rotation unit uses a predetermined axis as a spindle to rotate and position the recording head in a plane parallel to a plane of the medium.

Abstract: According to an aspect of the present invention, by correcting the measurement positions of each line block with a reference line block serving as a reference point, the effect of disruption of the read image lattice caused by the image reading apparatus can be diminished, whereby the effect of paper deformation can be reduced, making highly accurate dot position measurement possible.

Abstract: A liquid ejecting head includes a flow path forming substrate in which pressure generation chambers are formed. The pressure generation chambers communicate with nozzles that eject liquid droplets. Piezoelectric elements are positioned on the flow path forming substrate to generate pressure changes in the pressure generation chambers. Each piezoelectric element includes a piezoelectric body layer, a first electrode on one side of the piezoelectric body layer, and a second electrode on the opposite side of the piezoelectric body layer. The piezoelectric element is driven in a condition that the relationship between minimum voltage Vmin, and maximum voltage Vmax, which are applied to the piezoelectric element, and peak voltage Vo satisfies the expression, Vmin<Vo<Vmax. In this expression, the peak voltage Vo is a voltage value at which a primary differential coefficient of displacement by voltage, which is obtained from a displacement-voltage curve, is at a maximum value.

Abstract: A liquid ejecting device to eject droplets of liquid onto a recording medium is provided. The image ejecting device includes a recording medium conveyer, a liquid ejecting head, a detector unit, an image data storage, a controller, and a cancellation signal output unit to output cancellation signals in an error condition. The controller includes a creating unit to create first dot pattern data and sum segments extracted from the first dot pattern data to create second dot pattern data, a transmission unit, and a cancellation controller unit to stop the creating unit, create second dot pattern data by adding a dot pattern to the segments having been extracted from the first dot pattern data, and transmit the created second dot pattern data to the transmission unit. The controller controls the liquid ejecting head to eject the droplets from the nozzles according to the second dot pattern data.

Abstract: While a conveying error of a roller depends on the eccentricity of the roller, the amount and the state of the eccentricity sometimes makes the roller have different conveying errors from one point in the longitudinal direction of the roller to another. There is provided a construction for obtaining a correction value that is suitable for the correction of the conveying error even in such a case as described above. To this end, plural test patterns are formed in the longitudinal direction of the roller. Then, a suitable correction value for correcting the conveying error that depends on the eccentricity of the roller is obtained on the basis of these test patterns.

Abstract: A printing apparatus includes a line head which includes first and second basic heads each having a plurality of nozzles in a predetermined direction and in which the first and second basic heads are arranged in the predetermined direction so as to form an overlapping section in the predetermined direction and a controller which controls the first and second basic heads when at least one of a print medium and the line head moves in a direction intersecting the predetermined direction and which controls the first and second basic heads so as to print the contour of a character or a line image by using only one of the first and second basic heads when the character or the line image is contained in an image printable by the overlapping section.

Abstract: A stationary pagewidth inkjet printhead has one or more nozzle rows extending along a longitudinal axis of the printhead. Each nozzle is configurable to fire a droplet of ink at a plurality of predetermined different dot positions along the longitudinal axis, and each nozzle has an associated primary dot position. The printhead is configured to compensate for a dead nozzle by printing from a selected functioning nozzle positioned in a same nozzle row as the dead nozzle. The selected functioning nozzle is configured to fire some ink droplets at the primary dot position associated with the dead nozzle and to fire some ink droplets at its own primary dot position.

Abstract: A print head control device 4 in an ink jet printer IJP includes a print head drive board 42c3, a PCIe, and an image processing computer 42c. The print head drive board 42c3 is configured by a circuit between the PCIe and the print head drive board 42c3,the circuit having an interface function and a print head drive function integrated therein. This circuit includes an FPGA configured to perform a rearrangement processing such that assigned page data is matched to alignment of print heads 50. Further, a device driver 42c7 which is control software for the print head drive board 42c3 performs an internal transfer processing of the assigned page data to the print head drive board 42c3.

Abstract: Among other things, the disclosure features a system for use in fluid jetting. The system comprises a first print module comprising a first row of nozzles, a second print module comprising a second row of nozzles, and a controller to receive a first data packet from a remote device at a first moment and a second data packet from the remote device at a second moment after the first moment. Upon receipt of the first data packet, the controller is configured to cause at least some nozzles in the first row, at a third moment, to eject fluid droplets onto a line on a substrate. Upon receipt of the second data packet, the controller is configured to cause at least some nozzles in the second row, at a fourth moment separated from the third moment by a time delay, to eject fluid droplets onto the line on the substrate.

Abstract: A liquid body discharge device includes: a plurality of nozzles for discharging a liquid body to a liquid body discharged region of a substrate; and a plurality of heads including the plurality of nozzles. In the device, the liquid body is discharged to the liquid body discharged region of the substrate by moving one of the substrate and the plurality of heads. Further, an alignment direction of the plurality of nozzles provided to at least one of the plurality of heads is different from an alignment direction of the plurality of nozzles provided to a rest of the plurality of heads. Furthermore, the at least one of the heads moves in a moving path A and the rest of the plurality of heads moves in a moving path B that is a different moving path from the moving path A.

Abstract: A method of generating half tone print data is disclosed. The method starts by determining an extent of overlap caused by temperature variations of overlapping end portions of a pair of consecutive printhead segments. A dither value is also generated from a dither matrix, and the dither value is combined with the extent of overlap to produce an output value. A mathematical operation is performed on continuous tone print data based on the output value, to produce the half tone print data.

Abstract: A method of printing at a dot density exceeding a nozzle density in a stationary pagewidth printhead. The method includes the steps of: (i) advancing a print medium transversely past the stationary printhead at a rate of one line per one line-time; and (ii) firing droplets of ink from predetermined nozzles in a nozzle row to create successive lines of print. Some or all of the predetermined nozzles fire droplets of ink at a plurality of predetermined different dot positions along a longitudinal axis of the printhead during one line-time, such that the printed dot density in each line of print exceeds the nozzle density.

Abstract: A liquid jetting apparatus includes: a plurality of liquid jet heads each of which has a nozzle surface in which a plurality of nozzles are formed to align in one direction, a retention member which retains the plurality of liquid jet heads in a state of being arranged along one plane, a transport mechanism which transports a medium in a transport direction along the one plane, and a displacement mechanism which displaces the retention member in a specified direction toward one side along a direction intersecting the nozzle surfaces by curving the retention member or rotating the same in a rotation direction when the retention member extends due to temperature change on the one plane in an intersectant direction intersecting the transport direction.

Abstract: A printhead having at least first and second rows of print nozzle cells. Each each nozzle cell has an ink chamber, control circuitry and drive circuitry. Each nozzle cell in the first row has a corresponding nozzle cell in the second row. The drive circuitry of each nozzle cell of the first row is arranged adjacent the drive circuitry of the corresponding nozzle cell in the second row and distant the control circuitry of the corresponding nozzle cell in the first row.

Abstract: A method processes image data for a color separation to reduce visible perception of misalignment of printheads in a plurality of serially arranged printheads. The method includes detecting cross-process edges in image values for objects in a color separation to be printed by a plurality of serially arranged printheads, and disproportionately mapping image values corresponding to the object in the color separation to one of the printheads in the plurality of serially arranged printheads.

Abstract: A method enables changes in the operation of a web printing system in response to web dimensional changes being detected. The method includes identifying a cross-process dimensional change in a web moving through a printing system, comparing the identified cross-process dimensional change to a predetermined threshold, and changing operation of a component in the web printing system in response to the cross-process dimensional change exceeding the predetermined threshold.

Abstract: A printhead assembly extending in pagewidth direction includes an elongate support beam; an elongate shell at least partially enclosing and restraining the support beam; and a plurality of printhead integrated circuits mounted to the support beam and substantially aligned with one another in the pagewidth direction. The support beam has formed therein at least one printing fluid reservoir arranged in fluid communication with the plurality of printhead integrated circuits.

Abstract: A recording element substrate which is provided with a first recording element group and a second recording element group, each group including a plurality of recording elements.

Abstract: A carrier for an array comprising a plurality of print heads, comprises an elongate bar having an ink conduit extending through the bar in a longitudinal direction. The carrier also comprises a print head receiving area adapted to receive or mount the plurality of print heads, and a heat transfer fluid conduit extending through the bar in a longitudinal direction. The carrier is arranged so that each print head received or mounted in the print head receiving area is in fluid communication with the ink conduit, wherein the heat transfer fluid conduit is disposed adjacent both the ink conduit and the print head receiving area. The carrier may comprise two ink conduits and two heat transfer fluid conduits. Heat transfer fluid may in use be conducted along the first and second heat transfer conduits in opposite directions.

Abstract: In a printing device includes a plurality of heads corresponding to black K ink and colored inks C, M, and Y, wherein the heads are extended in a direction orthogonal to a conveying direction of a medium and are disposed in parallel from the upstream side to the downstream side, and ink droplets are discharged and deposited on the medium in order from the heads while the medium is being conveyed, a print condition setting method includes the steps of setting an order in accordance with the extent of concentration irregularity in the composite colors RGB; and creating, within the discharge order of the inks, the most separation of discharge order between the two colored inks that manifest the composite color having the greatest concentration irregularity, and inserting K ink between the discharge orders of the two colored inks that manifest the composite colors having the second greatest concentration irregularity.

Abstract: A method for arraying head assemblies of an inkjet printer and an apparatus used for the method that can reduce a period of time taken to array the head assemblies after the head assemblies are mounted in the inkjet printer by adjusting height and rotation center of each of the head assemblies before the head assemblies are mounted in the inkjet printer, and can improve array precision of the head assemblies by adjusting a position in the X direction and a rotation angle of each of the head assemblies having already adjusted height and rotation center after the head assemblies are mounted in the inkjet printer, by adjusting a position in the Y direction of each of the head assemblies and can control an ink spray time.

Abstract: An image forming method includes discharging a droplet of a recording fluid via nozzles of a recording head onto a print medium; performing a main scan in which the print medium is scanned in a main scan direction; performing a sub-scan in which the print medium is scanned in a sub-scan direction; determining an overlap region in an image region that is formed by a single main scan; and performing an overlap control by forming an image in the overlap region through a plurality of main scans while the print medium is moved in the sub-scan direction by a feed amount L, wherein L=(n?x)d?md, where n is a number of the nozzles in the recording head; x is a number of the nozzles in the overlap region; d is a nozzle pitch; and m is a feed correcting coefficient (0<m<1).

Abstract: According to an aspect of the present invention, a high-resolution, small-size, low-cost driving device includes a clock signal generating unit configured to receive a first clock signal of a differential signaling system and generate a second clock signal, an input unit configured to input a data signal which includes first information and second information, a first timing generating unit configured to select an edge of the second clock signal based on the first information and to generate a first signal by counting occurrences of the selected edge a second timing generating unit configured to select edge of the second clock signal based on the second information and to generate a second signal by counting occurrences of the selected edge, a logical circuit configured to generate a pulse signal based on the first and second signals, and a driving element configured to drive a driven element using the pulse signal.

Abstract: A liquid jetting device includes a plurality of nozzles. A driving signal generated by a driving signal generating section is applied to a charge-discharge actuator in correspondence with each nozzle to jet liquid from the nozzle. A charging source potential preliminary adjusted wave-form signal is pulse modulated and electrically amplified using a charging source potential transistor pair connected in a push-pull configuration, and output by a ripple filter to a collector of a charge-use transistor of the driving signal generating section to make a preliminary adjustment to the charging source potential for the driving signal generating section.

Abstract: The process enables surfaces of wood-based flat elements (10) to be printed, and comprises a preliminary step of graphic composition by means of an electronic processor and relative software, and a printing step. To print the wood-based flat elements an ink-jet printer (12) is used controlled by the electronic processor, said flat element moving relative to the printer (12) during the printing operation.

Abstract: A recording head having a plurality of recording elements that are grouped into a plurality of blocks and ejecting ink by driving the recording elements in a time-divisional manner includes driving units configured to drive the recording elements, an input unit configured to receive an enable signal that defines a period during which the driving of the recording elements is enabled at one ink ejection, and a control unit configured to control the time-divisional driving by the driving units on the basis of pulses detected during the period defined by the enable signal received by the input unit.

Abstract: A printhead assembly is provided having a support member, a plurality of ejection integrated circuits supported by the support member, and a plurality of controllers mounted on respective printed circuit boards supported by the support member. Each ejection integrated circuit has a plurality of ejection nozzles. Each controller is connected to a plurality of the ejection integrated circuits via individual flexible printed circuit boards and to the other controllers. Each controller is configured to control operation of at least 10,000 of the ejection nozzles of the connected ejection integrated circuits.

Abstract: Methods and apparatus herein provide for automated calibration of multiple printheads used in a multi-pass printing system. Aspects hereof print a plurality of gray scale printed patterns each printed pattern corresponding to a gray scale value for each of the multiple printheads. The printed patterns are then measured to determine the intensity (e.g., optical density) of each of the printed patterns. A measurement function is derived from the measured intensity and gray scale levels used to print each pattern. Calibrated transfer functions are then determined from the measurement function and target function where each calibrated transfer function relates, for a corresponding printhead, an input gray scale level of a pixel in an image to be printed to a calibrated gray scale level to use for the corresponding printhead when operating in multi-pass mode.

Abstract: An image recording apparatus, in which a line head is configured by arranging a plurality of nozzles, some of which are made to overlap, of short nozzle rows each having a jetting nozzle row arranged in one direction relative to a conveyance direction of a recording medium being conveyed by a conveyance mechanism and which forms records an image by jetting ink from the jetting nozzles onto the recording medium, comprises a conveyance information generating unit which generates conveyance information indicating a conveyance distance of the recording medium, a recording medium detecting unit which detects an edge of the recording medium being conveyed, and a controlling unit which performs a density correction of an image recorded by an overlapping portion of the short nozzle rows on the basis of a detection result of the recording medium detecting unit and the conveyance information obtained from the conveyance information generating unit.

Abstract: A driving device for a liquid jetting apparatus includes an application unit and a controller. The application unit generates and applies a first voltage of a first waveform to a first pressure generating unit and generates and applies a second voltage of a second waveform to the second pressure generating unit to jet a liquid droplet outside a nozzle after pulling liquid inside the nozzle. The second waveform includes at least one of a third waveform corresponding to a jetting angle for changing a jetting direction from a reference direction by deforming a liquid level of liquid pulled inside the nozzle in a direction of pushing the liquid level outside the nozzle, or a fourth waveform corresponding to a jetting angle for changing the jetting direction from the reference direction by deforming the liquid level of liquid pulled inside the nozzle in a direction of further pulling the liquid level.

Abstract: An image forming apparatus includes a plurality of controllers that controls nozzle groups for forming an image on an image forming medium based on image data; a plurality of distribution processing units that are connected to a portion of the controllers to transmit to the controllers image data for controlling the nozzle groups allocated to the controllers; and a transmitting processing unit that transmits the image data to the distribution processing unit. Upper and lower level distribution processing units from the first distribution processing unit at the uppermost level to the second distribution processing unit at the lowermost level are communicatably connected to each other. The first distribution processing unit is communicatably connected to the transmitting processing unit.

Abstract: A method measures distances between two printed lines on a rotating image receiving member to identify fluid drop mass or fluid drop velocity changes in inkjet ejectors in an inkjet printing system. An initial distance between the two lines is measured at the start of the operational life of the system. During the line of the printing system, the lines are reprinted and the distance between the two lines compared to the initial distance. If the distance has changed by more than a predetermined amount, a firing signal for the printheads that printed the lines is adjusted.

Abstract: The liquid ejecting heads are arranged on the head carrying member such that each pair of nozzles that are next to each other in terms of first-direction positions of adjacent ones of the liquid ejecting heads are shifted relative to each other by an offset length ? corresponding to a relative displacement in the first direction between the liquid ejecting heads due to thermal expansion during liquid ejection with reference to a specified pitch at which nozzles included in a single nozzle row are provided.

Abstract: A method for pen drop weight calibration includes altering an image prior to printing based on the difference in printing performance of a first pen and a second pen to produce altered image data, the first pen and the second pen being disposed in the same printer. The altered image data is then printed with the printer.