Abstract: In an ink jet recording head according to the present invention in which a small ink droplet and a large ink droplet can be discharged, a common liquid chamber is connected to discharge ports via ink flow paths and pressure chambers, and ink droplets are discharged from the discharge ports by utilizing thermal energy of heaters. Widths of the ink flow paths are narrower than widths of the pressure chambers so that the ink flow paths act as restriction portions. When it is assumed that a sectional area of the small liquid droplet ink flow path is SS, a sectional area of the small liquid droplet pressure chamber is SRS, a sectional area of the large liquid droplet ink flow path is SL and a sectional area of the large liquid droplet pressure chamber is SRL, a relationship SS/SRS<SL/SRL is established. According to the present invention, with this arrangement, even in the nozzle for discharging the small ink droplet, loss is reduced and energy efficiency can be enhanced.

Abstract: An ink jet print head has a bubble collecting device in an ink liquid chamber between a filter and an ink ejection opening for ejecting ink, a bubble moving device for moving bubbles to the bubble collecting device, and a bubble discharging device for discharging bubbles accumulated in the bubble collecting device to the outside. Further, an ink jet printing apparatus performs printing using an ink jet print head having a bubble collecting device in an ink liquid chamber between a filter and an ink ejection opening for ejecting ink, a bubble moving device for moving bubbles to the bubble collecting device, and a bubble discharging device for discharging the bubbles accumulated in the bubble collecting device to the outside.

Abstract: The ink jet printing apparatus has an ink moving device for returning almost all of the ink in the sub ink tank to the main ink tank. The method of supplying ink has a first step of returning the ink in the sub ink tank to the main ink tank, a second step of discharging bubbles in the sub ink tank out of the sub ink tank, and a third step of, after the first step, supplying a predetermined amount of ink from the main ink tank to the sub ink tank. The method of recovering the ink jet print head has a first step of returning the ink in the sub ink tank to the main ink tank, and a second step of discharging the ink from the print head by, after the first step, applying an external pressure against any part of the ink supply path.

Abstract: An ink container for containing ink to be supplied to an ink jet head to which the ink container is detachably mountable, inclues an ink supply port for supplying the ink to the ink jet head; a air vent for fluid communication with ambience; a claw-like projection provided on a first side of the ink container; a latching lever provided on a second side opposite from the ink container, the latching lever being resiliently supported on the ink container and having a latching claw.

Abstract: An ink cartridge (3) including an ink reservoir portion having a porous member (37) for storing ink and an ink supply portion (39) has an ink inducing element (47) disposed between the ink reservoir portion and the ink supply portion (39). The ink inducing element (47) is made of bundle of fibers in which each fiber is disposed in parallel to the direction of ink supplying from the ink reservoir to the ink supply portion (39), and one end of the ink inducing element (47) is press-touched to the porous member (37).

Abstract: An ink cartridge (3) including an ink reservoir portion having a porous member (37) for storing ink and an ink supply portion (39) has an ink inducing element (47) disposed between the ink reservoir portion and the ink supply portion (39). The ink inducing element (47) is made of bundle of fibers in which each fiber is disposed in parallel to the direction of ink supplying from the ink reservoir to the ink supply portion (39), and one end of the ink inducing element (47) is press-touched to the porous member (37).

Abstract: An ink jet recording head includes a plurality of recording element substrates each having a plurality of recording elements for applying ejection energy to recording liquid; a plurality of flow paths for the recording liquid which is to receive ejection energy; a supply port for supplying the recording liquid to the plurality of flow paths; a plurality of ejection outlets for ejecting the recording liquid, the ejection outlets being disposed face to the recording elements, respectively; wherein distances between the recording elements and the ejection outlets in at least one of the recording element substrates are different from distances between the recording elements and ejection outlets of another one of the recording element substrates, and wherein liquid ejection systems of the recording elements of the at least one of the recording element substrates and the recording elements of the another one of the recording element substrates, are different.

Abstract: An ink cartridge (3) including an ink reservoir portion having a porous member (37) for storing ink and an ink supply portion (39) has an ink inducing element (47) disposed between the ink reservoir portion and the ink supply portion (39). The ink inducing element (47) is made of bundle of fibers in which each fiber is disposed in parallel to the direction of ink supplying from the ink reservoir to the ink supply portion (39), and one end of the ink inducing element (47) is press-touched to the porous member (37).

Abstract: An ink cartridge (3) including an ink reservoir portion having a porous member (37) for storing ink and an ink supply portion (39) has an ink inducing element (47) disposed between the ink reservoir portion and the ink supply portion (39). The ink inducing element (47) is made of bundle of fibers in which each fiber is disposed in parallel to the direction of ink supplying from the ink reservoir to the ink supply portion (39), and one end of the ink inducing element (47) is press-touched to the porous member (37).

Abstract: An ink container for containing ink to be supplied to an ink jet head to which the ink container is detachably mountable, inclues an ink supply port for supplying the ink to the ink jet head; a air vent for fluid communication with ambience; a claw-like projection provided on a first side of the ink container; a latching lever provided on a second side opposite from the ink container, the latching lever being resiliently supported on the ink container and having a latching claw.

Abstract: An ink jet print head has bubble collecting means in an ink liquid chamber between a filter and an ink ejection opening for ejecting ink, means for moving bubbles to the bubble collecting means, and means for discharging bubbles accumulated in the bubble collecting means to the outside. Further, an ink jet printing apparatus performs printing using an ink jet print head having bubble collecting means in an ink liquid chamber between a filter and an ink ejection opening for ejecting ink, means for moving bubbles to the bubble collecting means, and means for discharging the bubbles accumulated in the bubble collecting means to the outside.

Abstract: The ink jet printing apparatus has an ink moving means for returning almost all of the ink in the sub ink tank to the main ink tank. The method of supplying ink has a first step of returning the ink in the sub ink tank to the main ink tank, a second step of discharging bubbles in the sub ink tank out of the sub ink tank, and a third step of, after the first step, supplying a predetermined amount of ink from the main ink tank to the sub ink tank. The method of recovering the ink jet print head has a first step of returning the ink in the sub ink tank to the main ink tank, and a second step of discharging the ink from the print head by, after the first step, applying an external pressure against any part of the ink supply path.

Abstract: An ink jet recording head includes a plurality of recording element substrates each having a plurality of recording elements for applying ejection energy to recording liquid; a plurality of flow paths for the recording liquid which is to receive ejection energy; a supply port for supplying the recording liquid to the plurality of flow paths; a plurality of ejection outlets for ejecting the recording liquid, the ejection outlets being disposed face to the recording elements, respectively; wherein distances between the recording elements and the ejection outlets in at least one of the recording element substrates are different from distances between the recording elements and ejection outlets of another one of the recording element substrates, and wherein liquid ejection systems of the recording elements of the at least one of the recording element substrates and the recording elements of tho another one of the recording element substrates, are different.

Abstract: An ink container for containing ink to be supplied to an ink jet head to which the ink container is detachably mountable, inclues an ink supply port for supplying the ink to the ink jet head; a air vent for fluid communication with ambience; a claw-like projection provided on a first side of the ink container; a latching lever provided on a second side opposite from the ink container, the latching lever being resiliently supported on the ink container and having a latching claw.

Abstract: An ink jet head cartridge having a recording head without an ink container includes a casing with an ink ejection device; and a structural member on the casing for improving handling of the recording head.

Abstract: An ink container for containing ink to be supplied to an ink jet head to which the ink container is detachably mountable, inclues an ink supply port for supplying the ink to the ink jet head; an air vent for fluid communication with ambience; a claw-like projection provided on a first side of the ink container; a latching lever provided on a second side opposite from the ink container, the latching lever being resiliently supported on the ink container and having a latching claw.

Abstract: An ink cartridge (3) including an ink reservoir portion having a porous member (37) for storing ink and an ink supply portion (39) has an ink inducing element (47) disposed between the ink reservoir portion and the ink supply portion (39). The ink inducing element (47) is made of bundle of fibers in which each fiber is disposed in parallel to the direction of ink supplying from the ink reservoir to the ink supply portion (39), and one end of the ink inducing element (47) is press-touched to the porous member (37).

Abstract: In an ink tank including a receiving portion having a polyhedral shape and receiving an ink absorbing member to store ink therein, an ink supply opening formed in part of the receiving portion for supplying the ink stored in the ink absorbing member to the outside, and an open-air communication port formed in part of the receiving portion apart from the ink supply opening for making an inner space of the receiving portion open to be communicated with open air, the ink is filled into the ink absorbing member while the inner space of the receiving portion is held under depressurization, and a projection comprising at least two ribs extending over a distance substantially equal to a length of inner wall surfaces of the receiving portion is provided on at least one of the inner wall surfaces of the receiving portion, which has a maximum surface area, substantially at a center thereof.

Abstract: In a construction in which between ink supply parts and a second chamber of ink tanks is selectively connected through a tube, a needle and septum, ink IN stored in the ink supply parts is supplied to the second chamber of the ink tanks by a pump, and then, a part of ink of the second chamber of the ink tanks is supplied to the ink supply parts, thereby introducing an air from the first chamber to the second chamber through the communicating passage.

Abstract: A liquid storing container employable for an ink jet recording apparatus includes a housing, a storing area containing a porous ink absorbing member, a valve mechanism, a filter in contact with the porous member, and a stopper. The liquid storing container is detachably connected to an ink jet recording head, where the valve mechanism allows an outflow of ink to the ink jet head through the joint portion when connected to an ink feed pipe, and closes the joint portion when disconnected from the ink feed pipe.