| Patent application number | Description | Published |
|---|
| 20090009573 | INK-JET PRINTER USING PHASE-CHANGE INK PRINTING ON A CONTINUOUS WEB - A printing apparatus includes a printing station, including at least one printhead for applying phase-change ink to the substrate, and a backing member disposed on an opposite side of the substrate substantially opposite the printhead, the backing member causing the substrate to reach a predetermined ink-receiving temperature. | 01-08-2009 |
| 20090231375 | System And Method For Compensating For Weak, Intermittent, Or Missing Inkjets In A Printhead Assembly - A system enables surrounding inkjets to be used to compensate for missing, intermittent, or weak inkjets without requiring additional passes of the image substrate or slowing the printing process. The system includes a printhead firing signal generator configured to generate a plurality of inkjet firing signals with reference to a set of predetermined firing signal parameters, and a firing signal adjustment circuit configured to modify at least one predetermined firing signal parameter to increase a first mass of liquid ink ejected by an inkjet proximate a defective inkjet in response to a signal identifying the defective inkjet. | 09-17-2009 |
| 20090262370 | System And Method For Distributing Image Values Of A Color Separation - A method processes image data in a color separation to attenuate printing defects arising from misalignment of serially arranged printheads that eject ink for the color separation. The method includes processing image values of the color separation with a first rendering process that corresponds to one printhead in a plurality of serially arranged printheads for printing the color separation, processing the image values of the color separation with a second rendering process that differs from the first rendering process for at least one other printhead in the plurality of serially arranged printheads for printing the color separation, generating firing signals for the one printhead from the rendered image values generated by the first rendering process, and generating firing signals for the at least one other printhead from the rendered image values generated by the second rendering process. | 10-22-2009 |
| 20100091347 | System And Method For Rendering Image Values To Be Printed In A Single Pass By Serially Arranged Printheads - 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. | 04-15-2010 |
| 20100123752 | Printhead Registration Correction System and Method for Use with Direct Marking Continuous Web Printers - A registration system for use with an imaging device includes sensors for detecting a web speed and a web tension of a moving web and a control system configured to generate a first timing offset for at least one marking station based on the detected web speed and web tension. An image sensor is configured to generate a signal indicative of a position of a marking material applied to the moving web by at least one of the marking stations. The control system is configured to generate a second timing offset for the at least one marking station based on the position of the marking material indicated by the third signal, and to adjust an actuation time for the at least one marking station using the first timing offset and the second timing offset. | 05-20-2010 |
| 20110012958 | Staggered Head Stitch Shifts in a Continuous Feed Direct Marking Printer - An imaging device includes an image receiving surface configured to move in a process direction in the imaging device. A plurality of printhead arrays are arranged to deposit marking material onto the image receiving surface. Each printhead array includes a plurality of printheads arrayed in a cross-process direction across the image receiving surface. Each printhead array includes at least one stitch line corresponding to a position along an axis parallel to the cross-process direction where an end of one printhead in the printhead array aligns with an end of another printhead in the printhead array. The at least one stitch line of each printhead array is offset a predetermined distance in the cross-process direction from the at least one stitch line of each of the other printhead arrays. | 01-20-2011 |
| 20110061552 | SYSTEM AND METHOD FOR EQUALIZING MULTIPLE MOVING WEB VELOCITY MEASUREMENTS IN A DOUBLE REFLEX PRINTING REGISTRATION SYSTEM - A method enables linear web velocities generated with reference to angular velocity signals generated by encoders at different rollers in a double reflex printing registration system to be equalized. The method includes identifying a low frequency component of a first linear velocity of a moving web, identifying a high frequency component of a second linear velocity of the moving web, and computing a linear velocity for the moving web at a roller in a print zone with reference to the identified high frequency component of the second linear velocity and the identified low frequency component of the first linear velocity. | 03-17-2011 |
| 20110063355 | SYSTEM AND METHOD FOR COMPENSATING RUNOUT ERRORS IN A MOVING WEB PRINTING SYSTEM - A method compensates for runout errors in a web printing system. The method includes identifying runout error at a first roller driving a web of printable media, generating a runout compensation value corresponding to the identified runout error, identifying a velocity of the moving web with reference to encoder output corresponding to an angular velocity of the first roller and the generated runout compensation value, and delivering a firing signal to a print head proximate the first roller to energize the inkjet nozzles in the print head and eject ink onto the web at a position corresponding to the computed web velocity. | 03-17-2011 |
| 20110063357 | SYSTEM AND METHOD FOR COMPENSATING FOR REGISTRATION ERRORS ARISING FROM HEATED ROLLERS IN A MOVING WEB PRINTING SYSTEM - A method compensates for thermal expansion of rollers in a web print zone. The method includes receiving an angular velocity signal from a first encoder for a roller in a print zone of a moving web printing system, receiving a signal from a first temperature sensor corresponding to a temperature of the roller, modifying a first diameter for the first roller with a first predetermined distance in response to the temperature of the first roller being different than a first predetermined temperature, identifying a velocity of a moving web in the print zone of the moving web printing system with reference to the modified first diameter, and delivering a firing signal to a first printhead proximate the first roller to energize the inkjet nozzles in the first printhead and eject ink onto the web at a position corresponding to the identified moving web velocity. | 03-17-2011 |
| 20110102525 | Non-Contact Heating Of Solid Ink Prints After Ink Fixing - An imaging device includes a media transport system configured to transport print media along a media path. A first print station is positioned along the media path that is configured to apply ink to a first side of the media. A first fixing assembly is positioned along the media path downstream from the first print station. A second print station is positioned along the media path downstream from the first fixing assembly that is configured to apply ink to a second side of the media. A second fixing assembly is positioned along the media path downstream from the second print station. A heater is positioned along the media path downstream from the second fixing assembly that is configured to heat the media to a gloss reducing temperature. | 05-05-2011 |
| 20110109683 | Temperature Leveling Roller and Pressure Nip Assembly - An imaging device includes a substantially continuous web of media, and a web transport system configured to transport the continuous web along a web path. A print station is positioned along the web path and is configured to apply ink to the continuous web. A temperature leveling ink spreader is disposed along the web path downstream from the print station. The temperature leveling ink spreader includes a leveler roller including a heater configured to generate thermal energy to heat the leveler roller to a spreading temperature. The leveler roller is positioned to be partially wrapped by the continuous web to generate a predetermined dwell time between the continuous web and the leveler roller as the continuous web is being transported to equalize the temperatures of the web and ink on the web to within a predetermined range about the spreading temperature. The temperature leveling ink spreader includes a pressure roller positioned adjacent the leveler roller to form a spreading nip therebetween through which the continuous web is fed after the predetermined dwell time. The spreading nip is configured to apply a predetermined pressure to the continuous web and the ink thereon. | 05-12-2011 |
| 20110141171 | System and Method for Compensating for Small Ink Drop Size in an Indirect Printing System - A method improves transfer efficiency of ink images on an image receiving member that were formed with small ink drops. The method includes identifying image data that correspond to ink drops that have a mass less than a predetermined threshold and that fail to comingle with another ink drop ejected with reference to the image data, modifying the identified image data to generate ink drops that comingle with at least one other ink drop ejected with reference to the image data, generating firing signals for inkjet ejectors in a print head with reference to the image data and modified image data, and ejecting in response to the firing signals a plurality of ink drops from the inkjet ejectors for each identified image data to enable a coalesced ink drop to form on an image receiving surface that has a mass that is greater than the predetermined threshold. | 06-16-2011 |
