Canon Production Printing Patente

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The present invention relates to a method of printing for improving print quality, the method comprising the steps of applying a layer of a pre-treatment liquid to a surface of a print substrate; printing an image on top of the layer of the pre-treatment liquid; pre-drying a printed print substrate obtained in step b at a temperature of between 30 and 50 degrees Celsius for 2-6 seconds; drying of and/or fixation of the image on the print printed substrate obtained after the pre-drying step. The invention also relates to a printing system for performing said method.

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The present invention relates to a method for cleaning an ink jet imaging device, the ink jet imaging device comprising a main ink supply channel (2) comprising an entrance side for supplying ink, a first ink channel comprising a first pressure chamber fluidly connected to a first nozzle; and a first actuator associated with the first pressure chamber, the first ink channel being in fluid connection with the main ink supply channel and defining a first ink path from the entrance side of the main ink supply channel to the first nozzle and having a first length L1, the ink jet imaging device comprising a second ink channel comprising a second pressure chamber fluidly connected to a second nozzle; and a second actuator associated with the second pressure chamber, the second ink channel being in fluid connection with the main ink supply channel and defining a second ink path from the entrance side of the main ink supply channel to the second nozzle and having a second length L2, wherein L2>L1; the method comprising the steps of: a) purging ink through the first and the second nozzle by applying a pressure on the entrance side of the main ink supply channel; and b) simultaneously to step a) actuating the first ink channel by applying a first actuation pulse to the first actuator wherein the actuation pulse provides a pressure wave in the first ink channel that counteracts the local pressure in the first ink channel, such that the flow through the first ink channel is reduced during purging.

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An electronic circuit for driving an individual print element in a print head is disclosed. The print head comprises an array of print elements, each print element having a piezoelectric actuator that is capable of generating an acoustic wave in an ink chamber of the print element, resulting in the ejection of an ink drop out of a nozzle that is in fluid connection with the ink chamber. The electronic circuit comprises a number of analog drivers for amplifying an output current at a voltage level in-between two source voltage levels, wherein the drivers can be switched into a tristate condition at a voltage level that does not equal one of the source voltage levels.

A method for maintenance of a print head (21) of an inkjet printer (100), the print head comprising a nozzle surface (or plate) with a plurality of ink nozzles (320) for jetting ink, wherein the method comprises the steps of purging the plurality of ink nozzles at least once, and performing a contact wipe over the nozzle surface (or plate) with a contact pressure such that the contact wipe barely touches the nozzle surface (or plate), with a wet tissue (350) comprising a wetting liquid, with vacuum pressure provided by an air pressure support unit. The invention also relates to an inkjet printer configured to execute the method.

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A rigid frame for a printer is provided comprising a pair of plates bonded together, wherein a first one of the plates comprises a receiving member formed in a recess (70; 170; 170) adjacent an edge (62) of the first one of plates, the receiving member being connected to the first one of the plates via receiving member holding elements on opposite sides of the receiving member, such that such that a center of the receiving channel is positioned in a plane defined by the first one of the plates and the receiving channel extends substantially perpendicular to the respective edge (62) of the first one of the plates, wherein a second one of the plates is positioned against the respective edge (62) of the first one of the plates at a substantially right angle, such that an insertion opening is aligned with the receiving channel, and wherein a bonding member is inserted via the insertion opening into the receiving channel to hold the two plates together.

1. A guidance rail (20) for a print head carriage and a printer having a guidance rail (20) are provided. The guidance rail (20) has mounting sites (12-1, 12-2) arranged essentially in a row and configured for applying mounting elements for mounting the guidance rail (20) to a printer. At least two distances (d12, d23, d34) between any adjacent mounting sites (12-i, 12-(i+1)) are non-equal, in order to reduce the susceptibility of the guidance rail (20) to vibrations induced by movements of the print head carriage.

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A method for nesting a plurality of digital input files into a digital output file according to a predetermined nesting strategy. Each digital input file is of a same predetermined digital filetype and has a size and a user unit value which is a multiplication factor of a maximum length or height defined for the same predetermined digital filetype. The method comprises the steps of determining a size of the digital output file which is needed to accommodate the plurality of digital input files according to the predetermined nesting strategy, determining a user unit value for the digital output file which corresponds to the determined size of the digital output file, and for each digital input file scaling the digital input file with a scale factor such that the size and an aspect ratio of the digital input file is kept in the digital output file when using the user unit value which is determined for the digital output file, and placing the scaled digital input file into the digital output file. The scale factor is equal to the determined user unit value of the digital output file divided by the user unit value of the digital input file.

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The present invention seeks to achieve a low costs and low air resistance belt support structure for an endless belt conveyor of an inkjet printer. The belt support structure is provided over a suction chamber. The belt support structure comprises a plurality of longitudinal, narrow support beams positioned spaced apart from one another and parallel to one another in a transport direction of the belt to define a flat support plane for the belt. The support beams provides a relatively small contact area with the belt, which results in low friction. The support beams further allow for a relatively large open area between them to achieve a low air resistance.

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A sheet printer (1) comprising a sheet conveyor assembly comprising a first conveyor (70) with a first holding device configured for exerting a holding force on a sheet (41) proportional to a coverage of the sheet (41) on the first conveyor (70) and a second conveyor (80) upstream of the first conveyor (70) comprising a second holding device configured for holding and releasing the sheet (41), a print head assembly (31) positioned over the first conveyor (70), a detector assembly (79) for sensing the transport of the first conveyor (70), a controller (37) storing on its memory a sheet media catalogue (90) and configured to control a release timing of the second holding device (80) for releasing the sheet (41) partially engaged by the first conveyor (70) based on a media type parameter (90A) selected from the media catalogue (90) and to control the print head assembly (31) to commence printing the sheet (41) based on transport information from the detector assembly (79).

The present invention relates to an aqueous pre-treatment liquid for use in ink jet printing, the pre-treatment liquid comprising water and magnesium-disulfamate. Such pre-treatment composition is and yellowing and crystal-free and shows good jetting properties. These properties are retained even when a solid co-solvent is added to the composition for anti-curl improvement. Therefore, the present invention enables providing non-yellowing pre-treatment liquids with good jetting properties and anti-curl behavior.