Abstract: A system using discharge orifices having first ink orifices for discharging a first ink and second ink orifices for discharging a second ink which is more difficult to be hardened than the first ink, a cap for covering the discharge orifices, and a suction device for effecting suction through the discharge orifices when the cap covers the discharge orifices. The system includes covering both the first ink orifices and the second ink orifices collectively by the cap, effecting suction through both the first ink orifices and the second ink orifices by driving the suction device when the cap covers both the first ink orifices and the second ink orifices collectively, discharging, after sucking, both the first ink orifices and the second ink orifices into the cap, and exhausting, after discharging, ink out of the cap by driving the suction means when an inside of the cap communicates with air.

Abstract: An ink jet recording apparatus comprises a carriage movable in a given direction with a recording head which is detachably mountable on it and provided with discharge ports for discharging liquid. The apparatus is arranged to include a sensor for detecting the presence or absence of the carriage, the recording head, and at least one of the ink containers. This sensor is provided for the main body of the apparatus and positioned within the movable range of the carriage. With this arrangement, it is possible to simplify the structure required for detecting whether or not these vital elements for recording are installed without any auxiliary power-supply or memory means.

Abstract: An operation method for an ink jet recording apparatus comprises a cap for covering the discharge orifices for discharging the ink, and suction means for effecting suction through said discharge orifices. The method includes a suction process of effecting suction through said discharge orifices by driving said suction means when said cap covers said discharge orifices, a discharge process of discharging the ink from said discharge orifices into said cap, and an exhausting process of exhausting the ink out of said cap.

Abstract: A liquid jet recording method includes applying thermal energy to liquid in a liquid passage to produce film boiling of the liquid to produce a. bubble; permitting the bubble to communicate with ambience; wherein the liquid passage is not blocked in the communicating step.

Abstract: A system using discharge orifices having waterproof ink orifices for discharging waterproof ink which becomes water insoluble after drying and non-waterproof ink orifices for discharging non-waterproof ink, a cap for covering the discharge orifices, and a suction device for effecting suction through the discharge orifices when the cap covers the discharge orifices. The system includes covering both the waterproof ink orifices and the non-waterproof ink orifices collectively by the cap, effecting suction through both the waterproof ink orifices and the non-waterproof ink orifices by driving the suction device when the cap covers both the waterproof ink orifices and the non-waterproof ink orifices collectively, discharging, after sucking, both the waterproof ink orifices and the non-waterproof ink orifices into the cap, and exhausting, after discharging, ink out of the cap by driving the suction means when an inside of the cap communicates with air.

Abstract: An ink jet recording apparatus comprises a recording head having discharge ports to discharge ink; an ink tank containing ink to be supplied to the recording head; and device for performing predischarges to stabilize ink discharges from the recording head. In this apparatus, the recording head is provided with a discharge unit to discharge plural kinds of ink, and the device for performing predischarges operates predischarges from all the discharge ports, only from the discharges ports in the vicinity of each end of the discharging units, and from all the discharge ports in that order at least for predischarges from discharging unit having relatively thin ink. With such head and device for performing predischarges, it is possible to remove mixed ink after suction recovery with a lesser amount of ink consumption, and execute a high quality recording stably at all times.

Abstract: An operation method for an ink jet recording apparatus comprises a cap for covering the discharge orifices for discharging the ink, and suction means for effecting suction through said discharge orifices. The method includes a suction process of effecting suction through said discharge orifices by driving said suction means when said cap covers said discharge orifices, a discharge process of discharging the ink from said discharge orifices into said cap, and an exhausting process of exhausting the ink out of said cap.

Abstract: A control portion for arithmetically predicting a temperature transition of a printing head using a predicting parameter includes an interface for receiving the predicting parameter from outside of the apparatus. The predicting parameter is based on a table regarding temperature increase of the printing head.

Abstract: An ink jet recording apparatus comprising a recording head having discharge ports for discharging the ink, an ink tank for storing said ink to be supplied to the recording head, and suction recovery device for stabilizing the ink discharge from the recording head, characterized in that the suction recovery device has a plurality of suction operations, which can be selected in accordance with the content of the discharge stabilization.

Abstract: Whether or not a color image is present adjacent to a black image is discriminated. Whether the black image is formed using a black ink or a plurality of color inks C, M, and Y is determined in accordance with the discrimination result. When the black image is formed using the plurality of color inks, it is recorded using a repetitive pattern of two of C, M, and Y so as to prevent blurring with the color image, and to improve fixing characteristics by decreasing the total ejection amount.

Abstract: An ink jet printing system to perform printing by ejecting ink toward a printing medium by employing a printing head having ink passages for ejecting ink through ejection openings and a common ink chamber supplying the ink into the ink passages.

Abstract: A method of forming a black image on a recording member includes the steps of providing each of a black ink having a first penetration rate and at least one color ink having a second penetration rate different from the first penetration rate, applying the at least one color ink to the recording member, and applying the black ink to the recording member after the at least one color ink has been absorbed into the recording member is disclosed. An ink-jet recording apparatus is also disclosed.

Abstract: A liquid jet recording method includes applying thermal energy to liquid in a liquid passage to produce film boiling of the liquid to produce a bubble; permitting the bubble to communicate with ambience; wherein the liquid passage is not blocked in the communicating step.

Abstract: An ink jet recording apparatus comprises a carriage movable in a given direction with a recording head which is detachably mountable on it and provided with discharge ports for discharging liquid. The apparatus is arranged to include a sensor for detecting the presence or absence of the carriage, the recording head, and at least one of the ink containers. This sensor is provided for the main body of the apparatus and positioned within the movable range of the carriage. With this arrangement, it is possible to simplify the structure required for detecting whether or not these vital elements for recording are installed without any auxiliary power-supply or memory means.

Abstract: A head for discharging yellow ink, magenta ink, cyan ink and first black ink having a relatively fast penetration velocity to a recording medium and a head for discharging second black ink having a relatively low penetration velocity are used to print an image. When a black image is adjacent to a color image, the black image is formed by using the first black ink, and when the black image is not adjacent to the color image, the black image is formed by using the second black ink. A black ink and a plurality of color inks having a different penetration velocity to a recording medium than that of the black ink are also used to print an image.

Abstract: When the color printing is performed using a recording head arranged such that number of nozzles for discharging black ink is greater than the number of nozzles for discharging inks of other colors, the use frequency of some nozzles among all the nozzles for discharging the black ink is higher, so that image unevenness may arise when transferred to the black printing. The present invention relates to an ink jet recording method and an ink jet recording apparatus in which the image unevenness often seen in the black printing involving the use of more nozzles than other colors, and the blur of recorded image seen in the image having black images adjacent color images located are reduced.

Abstract: Whether or not a color image is present adjacent to a black image is discriminated. Whether the black image is formed using a black ink or a plurality of color inks C, M, and Y is determined in accordance with the discrimination result. When the black image is formed using the plurality of color inks, it is recorded using a repetitive pattern of two of C, M, and Y so as to prevent blurring with the color image, and to improve fixing characteristics by decreasing the total ejection amount.

Abstract: An ink jet recording apparatus comprises a recording head having discharge ports to discharge ink; an ink tank containing ink to be supplied to the recording head; and means for performing predischarges to stabilize ink discharges from the recording head. In this apparatus, the recording head is provided with a discharge unit to discharge plural kinds of ink, and the means for performing predischarges operates predischarges from all the discharge ports, only from the discharges ports in the vicinity of each end of the discharging units, and from all the discharge ports in that order at least for predischarges from discharging unit having relatively thin ink. With such head and means for performing predischarges, it is possible to remove mixed ink after suction recovery with a lesser amount of ink consumption, and execute a high quality recording stably at all times.

Abstract: In a jet recording method, a recording material is placed in a path defined by a nozzle leading to an ejection outlet, and then heated by actuating a heater disposed within the nozzle to generate a bubble within the recording material, thus ejecting a droplet of the recording material out of the ejection outlet under the action of the bubble to be attached onto recording paper. As improvement, the recording material is pre-heated by actuating the heater before the heating for generating the bubble, and the generated bubble is caused to communicate with ambience. As a result, the ejection of the recording material droplet is stabilized without causing splash or mist.

Abstract: An ink jet recording method uses black ink and a plurality of inks having different colors, which have ink penetration properties different from that of the black ink. The method includes generating multi-level black recording datum on the basis of a multi-level color recording datum of a discrimination pixel, wherein a ratio of generation of black recording datum is changed in accordance with a multi-level color recording datum of a pixel marginal to the discrimination pixel; and recording a color image on the basis of the multi-level color recording datum and the multi-level black recording datum generated by the generating step.