Patent application number | Description | Published |
20080297552 | INK JET PRINTING APPARATUS AND INK JET PRINTING METHOD - An object of the present invention is to provide an ink jet printing apparatus that inhibits the temperature of a print head from increasing excessively while preventing significant density or hue unevenness from occurring in images, without the need for a complicated structure or complicated control. Thus, the present invention detects temperature of the print head, and sets number of scans in which the print head is to stand by until start of scanning and a standby time for each of the set number of scans by the print head, on the basis of the detected temperature. | 12-04-2008 |
20090021548 | INKJET PRINTING APPARATUS AND METHOD FOR PERFORMING MAINTENANCE ON INKJET PRINTING APPARATUS - An inkjet printing apparatus, a maintenance method and an inkjet printing system which are capable of precisely calculating the amount of satellites or ink mist generated and replacing a collecting mechanism at most appropriate time. The inkjet printing apparatus has a wind-powered collecting mechanism collecting generated sub-droplets such as satellites or ink mist, and head temperature sensors for obtaining temperature information of the print head. The CPU calculates the amount of sub-droplets generated on the basis of printing conditions including the detected temperature information of the print head. The CPU determines whether the replacement of the wind-powered collecting mechanism is necessary on the basis of the calculated amount of sub-droplets generated. | 01-22-2009 |
20090167802 | INKJET PRINTING APPARATUS AND PRELIMINARY DISCHARGE CONTROL METHOD OF SAID APPARATUS - In an inkjet printing apparatus which performs printing on a printing medium using an inkjet printhead for discharging ink, preliminary discharge, where ink discharge irrespective of printing is performed at the time of print execution, is performed under a predetermined condition to obtain information regarding a discharge state of the printhead. Based on the obtained information, an execution condition of the preliminary discharge is controlled. By virtue of this control, an execution condition (parameter) of the preliminary discharge can appropriately be controlled in accordance with the discharge state of the printhead, in which the ink drying state and the increased viscosity state of ink vary depending on individual differences, usage environment, usage histories (durability) and so on. | 07-02-2009 |
20100156973 | PRINTING APPARATUS AND PRINTING METHOD - The present invention has an object to provide an inkjet printing apparatus that can realize both high quality image formation and improvement of a device life caused by the reduction of a mist amount of a processing liquid. The present invention is provided with a control unit that can independently control an ink ejection condition in an ink ejection unit and a processing-liquid ejection condition in a processing-liquid ejection unit. The control unit controls the ejection condition in each ejection unit so that the mist amount of the processing liquid ejected from the processing-liquid eject unit is smaller than that of the ink ejected from the ink eject unit. | 06-24-2010 |
20100156977 | INK JET PRINTING APPARATUS AND PRINTING METHOD - An object of the present invention is to provide a printing apparatus and a printing method even with a variation in the temperature of a print head, thus keeping the quality of images resulting from printing high. Adjustment patterns used to adjust the difference in ink ejection timing between ink ejected in a forward direction and ink ejected in a backward direction during scanning are printed at a plurality of different temperatures. Adjustment values for the ink ejection timing at the respective temperatures are selected from the adjustment patterns. Then, the correction value for the ink ejection timing is calculated from the adjustment values based on the temperature detected by the detection device. Printing is then performed with the difference in ink ejection timing between the ink ejected in the forward direction and the ink ejected in the backward direction during scanning, adjusted based on the correction value. | 06-24-2010 |
20100156978 | INKJET PRINT APPARATUS AND INKJET PRINT METHOD - The present invention relates to a print apparatus for performing a print by a scan of a print head with heaters generating thermal energy for ejecting ink. A temperature of the print head is detected before the scan of the print head, and when the detected temperature exceeds a threshold temperature, the print head is waited. Information relating to the cumulative number of drives of the heater in the print head is acquired and based upon this information, the threshold temperature is changed to a lower temperature as the cumulative number of the drives is the larger. An excessive temperature rise of the head is restricted and also a throughput reduction is reduced as much as possible. | 06-24-2010 |
20100214353 | INK JET RECORDING APPARATUS - Suitable preliminary discharge conditions are set for a recording head using reaction liquid in bidirectional recording. While the recording head makes a reciprocating motion and scans a recording medium, a preliminary discharge of the reaction liquid is executed after recording on the recording medium from discharge ports on the rear side in a direction in which the recording head travels and a preliminary discharge of ink is executed when a preliminary discharge of the reaction liquid is not executed. | 08-26-2010 |
20100302297 | INKJET PRINTING APPARATUS AND METHOD OF CONTROLLING THE SAME - The invention prevents inconveniences from being caused by ejection failure and unintended mixing of different colors. To this end, the invention performs preliminary ejection of ink after a wiping action to sweep mist adhering to a face of a printing head, in which an ejection opening is formed. Moreover, the amount of ink to be wastefully consumed by the preliminary ejection after the wiping is reduced. To this end, the number of preliminary ejections is regulated. The degree of adherence of mist to the ejection-opening-formed face depends on the amount of printing (the number of printed sheets, the number of ink ejections for printing, or the like). So, at the time of the preliminary ejection after the wiping, the number of ink ejections in the preliminary ejection is regulated in accordance with the amount of printing that has been done since the last wiping action. | 12-02-2010 |
20100302301 | PRINTING APPARATUS AND PRINTING METHOD - There is an object of providing a printing apparatus which can restrict a variation in ejection characteristic of an ink droplet due to a temperature change of a printing head to restrict degradation in an image. The printing apparatus adjusts temperatures of the print head to first and second temperature so as to measure ejection characteristics of the print head at the first and second temperature. Then, a driving condition is generated based on the measured ejection characteristics and a printing is performed based on the measured ejection characteristics. | 12-02-2010 |
20110310159 | INKJET APPARATUS AND METHOD OF JUDGING REPLACEMENT TIMING FOR COMPONENTS OF THE APPARATUS - In an inkjet apparatus using an inkjet head ejecting multiple types of inks different in viscosity after evaporation of solvent, a replacement timing for a component is judged by using a consumption amount of each type of ink and a generation rate in amount of ink droplets. Accordingly, in the case of using a large amount of ink strongly susceptible to fixed adhesion and increase in viscosity, the component is replaced at an earlier timing, which prevents fixed adhesion from influencing the print performance and the printing apparatus main body. By contrast, in the case of using a large amount of ink less susceptible to fixed adhesion and increase in viscosity, the component is replaced at a later timing and thus can be used until reaching its lifetime. | 12-22-2011 |
20110310160 | INKJET APPARATUS AND METHOD FOR JUDGING REPLACEMENT TIMING FOR COMPONENTS OF THE APPARATUS - In an inkjet apparatus capable of ejecting an ink and a treatment liquid for insolubilizing or coagulating a color material in the ink, a replacement timing for a component of the apparatus is judged based on both the consumption amounts of the ink and treatment liquid measured when the two are consumed together and the consumption amount of the ink measured when the ink is consumed alone. Thus, the component is replaced at an earlier timing when the influence of fixed adhesion is great due to frequent ejection of both of the ink and treatment liquid, which prevents fixed adhesion from influencing the print performance and the printing apparatus main body. By contrast, when the fixed adhesion slowly develops because of less-frequent ejection of both of the ink and treatment liquid, the component is replaced at a later timing and thus can be used until reaching its lifetime. | 12-22-2011 |
20120026230 | INKJET PRINTING APPARATUS - This invention prevents a possible color mixing, that may occur more than a predetermined time after the wiping operation, by executing a pre-printing cleaning ejection while at the same time minimizing the amount of waste ink produced by the cleaning ejection. To this end, if a color mixing is determined as being likely to occur an elapsed time after the previous wiping operation, the pre-printing cleaning ejection uses a second ink volume U, which represents both the color mixing elimination ink volume and the ejection failure elimination ink volume. If it is decided that there is no likelihood of the color mixing occurring the elapsed time after the wiping operation, the pre-printing cleaning ejection uses the first ink volume D which represents only the ejection failure elimination ink volume. | 02-02-2012 |
20120176438 | INKJET RECORDING APPARATUS - An inkjet recording apparatus that suppresses temperature rising of a recording head to decrease standby time when the recording head is high in temperature, thereby reducing a drop in recording speed and degradation in image quality. The inkjet recording apparatus includes a recording head configured to have a discharge port surface in which a discharge port for discharging ink is formed, a temperature sensor configured to detect temperature of the recording head, and a cleaning unit configured to make contact with the recording head to clean the discharge port surface. The inkjet recording apparatus controls whether to make the cleaning unit contact the discharge port surface based on the recording head temperature detected by the temperature sensor. | 07-12-2012 |
20120188304 | INKJET PRINT APPARATUS AND INKJET CONTROL METHOD - When performing at least one of preliminary ejection or a suction unit as a countermeasure against adhering ink that accumulates in the portion where preliminary ejection is performed, the preliminary ejection amount and suction speed of the suction unit are optimized. An inkjet print apparatus that prints by using a printing head for ejecting ink, comprising: an ejecting unit; a sucking unit; a measuring unit that measures an elapsed time after the sucking unit is performed; and a control unit that control ejection by the ejecting unit or sucking by the sucking unit according to the elapsed time measured in the measuring unit; wherein as the elapsed time becomes longer, the amount of ink that is ejected to the ink receiving unit in the ejecting unit is increased or a suction speed at which the ink is sucked in the sucking unit is increased. | 07-26-2012 |
20130027489 | PRINTING APPARATUS - A printing apparatus includes a printing unit configured to apply ink to a recording medium while reciprocating a print head with respect to the recording medium and a drying unit configured to apply energy for accelerating dryness to the recording medium to which the ink is applied by the print head. The drying unit applies a larger energy at edges of a range within which the printing unit moves on the recording medium than at a middle of the range. | 01-31-2013 |
20130147868 | INK JET RECORDING APPARATUS - The present invention relates to an ink jet recording apparatus including a recording head including a plurality of energy generation elements configured to generate thermal energy. The ink jet recording apparatus includes a specification unit and a control unit. The specification unit specifies a pulse width upper limit value of a prepulse during a recording operation based on a minimum pulse width by which ink is discharged by applying a drive pulse to the energy generation elements and a temperature of the recording head during the recording operation. The control unit controls the energy generation elements to be driven using a drive pulse of a prepulse with a pulse width equal to or less than the pulse width upper limit value. | 06-13-2013 |
20130235104 | INKJET PRINTING APPARATUS AND DRIVING METHOD - Provided are an inkjet printing apparatus, whereby pulse drive periods and a pause period can be adjusted so as to fall within predetermined periods, while the volume of ink to be ejected is ensured, and a heat generating element driving method therefor. For the inkjet printing apparatus, a pulse signal drive period for a pulse driven previously, a pulse signal drive period for a pulse driven subsequently and a pause period are set to perform ejection of ink droplets one time. When the ejection period exceeds the threshold value, the pulse signal drive period for the pulse driven subsequently and the pause period are reduced to adjust the ejection period to be equal to or lower than a threshold value. | 09-12-2013 |
20130257931 | INK JET RECORDING APPARATUS AND METHOD OF WIPING RECORDING HEAD - An ink jet recording apparatus includes a recording head, a carriage, a wiping unit, and a control unit. The recording head includes a discharging port surface provided with a first discharging port row group having at least one discharge port row formed by arraying a plurality of discharging ports in a predetermined direction and a second discharging port row group having at least one discharge port row formed by arraying a plurality of discharging ports in a predetermined direction. The carriage causes the recording head to scan reciprocally in a direction intersecting the predetermined direction. The wiping unit includes a sheet member for wiping the discharge port surface and a winding device to wind the sheet member. The control unit controls the winding device so that the first discharge port row group and the second discharge port row group are wiped with different areas of the sheet member. | 10-03-2013 |
20130257977 | PRINTING APPARATUS - A printing apparatus includes a print head, a scanning unit, a sheet-form member, a winding device, and a determining unit. The print head includes an orifice face having an ejection orifice to eject a liquid. The scanning unit performs scanning while reciprocating the print head. The sheet-form member performs a wiping operation of the orifice face of the print head, wherein the wiping operation includes a first wiping operation and a second wiping operation. The winding device performs a winding operation of the sheet-form member. The determining unit determines a length of the sheet-form member that is to be wound by the winding device in accordance with a length of time between the first wiping operation performed by the sheet-form member and the second wiping operation performed by the sheet-form member that follows the first wiping operation. | 10-03-2013 |
20130257978 | INKJET RECORDING APPARATUS AND METHOD FOR CONTROLLING THE SAME - An inkjet recording apparatus includes a recording head, a carriage, a wiping unit, and a controller. The recording head has a discharge port face with a plurality of discharge ports to discharge ink. The carriage has the recording head mounted thereon and performs reciprocal scanning. The wiping unit includes a sheet-shaped wiping member to wipe the discharge port face and a conveying unit to convey the wiping member. The controller controls an amount of conveyance of the wiping member by the conveying unit. The controller performs control so that the conveyance amount in a first case, where a time elapsed since a last conveyance operation of the wiping member is greater than or equal to a certain time, becomes greater than the conveyance amount in a second case, where the time elapsed since the last conveyance operation of the wiping member is less than the certain time. | 10-03-2013 |
20130257980 | INKJET PRINTING APPARATUS AND CONTROL METHOD - An inkjet printing apparatus includes a purge unit having a sheet member that purges ink deposited on an orifice face of a print head and a winding unit that winds the sheet member. By using the number of ink ejections executed between a first purge operation and a second purge operation, the amount of winding of the sheet member is controlled after the second purge operation is completed. | 10-03-2013 |
20140218440 | PRINTING APPARATUS AND CLEANING METHOD THEREOF - An embodiment of the present invention provides a wiping method capable of preventing a problem such as color mixing or a discharge failure in a wiping operation during the reciprocating motion of a carriage. According to the embodiment, one or a plurality of orifice arrays out of a plurality of orifice arrays included in a printhead are wiped by making a sheet-like wiping member contact to the orifice surface of the printhead. After that, the wiping member is separated from the orifice surface of the printhead, and the used wiping member is wound. Then, the wiping member is made to contact to the orifice surface of the printhead again, and the next one or more orifice arrays are wiped. | 08-07-2014 |
20150022574 | PRINTING APPARATUS AND PRINTING METHOD - An inkjet printing apparatus which performs printing by performing scanning using a print head has a problem in that quality of an image of a ruled line is degraded when ink is not ejected for a certain period of time. To address this problem, control is performed such that power for driving the print head for unit regions including pixels having a ruled-line attribute becomes higher than power for driving the print head for unit regions which do not include the pixels having the ruled-line attribute. By this, a high-quality ruled-line image may be printed. | 01-22-2015 |