Abstract: An ink jet head is provided which includes: nozzles forming a predetermined array; liquid chambers respectively provided for the nozzles; pressure generation elements respectively provided for the liquid chambers which respectively discharge liquid in the liquid chambers; individual supply flow paths which respectively supply the liquid to the liquid chambers; a common supply flow path that is connected to each individual supply flow path and supplies the liquid into each individual supply flow path; and a liquid supply unit that circulates the liquid of the common supply flow path so as to make the liquid flow in one direction in the common supply flow path. The common supply flow path has a shape in which a cross-sectional area is increased and decreased at a predetermined interval. Each individual supply flow path is provided at a position where the cross-sectional area of the common supply flow path is increased.

Abstract: An ejection surface cleaning apparatus for cleaning a liquid ejection surface of a liquid ejection head ejecting an ejection liquid, includes: a cleaning liquid deposition device which deposits a cleaning liquid that dissolves or redisperses the ejection liquid, onto the liquid ejection surface; a wiping device which wipes the liquid ejection surface onto which the cleaning liquid has been deposited; and a control device which controls a leave time from deposition of the cleaning liquid onto the liquid ejection surface until wiping performed by the wiping device.

Abstract: An ink jet head is provided which includes: nozzles forming a predetermined array; liquid chambers respectively provided for the nozzles; pressure generation elements respectively provided for the liquid chambers which respectively discharge liquid in the liquid chambers; individual supply flow paths which respectively supply the liquid to the liquid chambers; a common supply flow path that is connected to each individual supply flow path and supplies the liquid into each individual supply flow path; and a liquid supply unit that circulates the liquid of the common supply flow path so as to make the liquid flow in one direction in the common supply flow path. The common supply flow path has a shape in which a cross-sectional area is increased and decreased at a predetermined interval. Each individual supply flow path is provided at a position where the cross-sectional area of the common supply flow path is increased.

Abstract: Inkjet apparatus includes: a tank; a first flow channel; a first liquid chamber; a second flow channel; a second liquid chamber; a first liquid movement; a second liquid movement device; a first pressure determination device; a second pressure determination device; a pressure control device which controls pressures in the first and second liquid chambers by respectively controlling the first and second liquid movement devices, in accordance with determination results of the first and second pressure determination devices, in such a manner that the internal pressures of the first and second liquid chambers respectively remain at the target pressures; a circulation path through which the liquid inside the first liquid chamber is circulated without passing through the inkjet head; and a deaeration device which is provided at an intermediate point of the circulation path and which removes dissolved gas.

Abstract: There is provided a droplet ejection device comprising: a droplet ejecting head comprising a droplet ejecting surface on which an ejecting aperture from which droplets are ejected and a collecting hole for collecting adherent liquid adhered to the droplet ejecting face are formed; and a collecting unit that causes the liquid to overflow to the droplet ejecting face through the collecting hole and collects the overflowed liquid through the collecting hole together with the adherent liquid.

Abstract: The recording head cleaning apparatus cleans a nozzle surface of a recording head that is disposed at an inclination with respect to horizontal. The recording head cleaning apparatus includes: an application roller having a substantially conical shape of which a circumferential surface holds cleaning liquid and has an inclination corresponding to the inclination of the nozzle surface, an axis of the substantially conical shape being a rotational axis of the application roller; and a rotating device which rotates the application roller on the rotational axis to apply the cleaning liquid to the nozzle surface while not making the application roller in contact with the nozzle surface.

Abstract: The invention is directed to an ink-jet recording apparatus including: a recording medium transport unit as defined herein; a full-line ink-jet head as defined herein; and an ultraviolet light illumination unit as defined herein, wherein the ultraviolet light illumination unit comprises an aperture-type hot-cathode tube, or an ultraviolet-setting ink-jet recording apparatus including: a recording medium transport unit as defined herein; and ink-jet head as defined herein; and an ultraviolet light illumination unit as defined herein, wherein: the ultraviolet light illumination unit comprises plural aperture-type hot-cathode tubes and apertures of at least one set of aperture-type hot-cathode tubes are rotated so that an overlap of their illumination regions is increased.

Abstract: A UV curable ink-jet recording apparatus includes: a recording medium transporting unit; an ink-jet head; and a UV irradiating unit, wherein the apparatus includes a light capturing portion between the UV irradiating unit and the ink-jet head, at least a part of the light capturing portion as seen in a longitudinal section taken vertically along a direction of transporting the recording medium has an opened wedge shape having no base side and comprising: a side vertical to the recording medium; and an oblique side which is in contact with a top of the vertical side, and which extends obliquely downward, the vertical side is located on the side of the ink-jet head, and the oblique side downward extends from the top toward the UV irradiating unit.

Abstract: There is provided a droplet ejection device comprising: a droplet ejecting head comprising a droplet ejecting surface on which an ejecting aperture from which droplets are ejected and a collecting hole for collecting adherent liquid adhered to the droplet ejecting face are formed; and a collecting unit that causes the liquid to overflow to the droplet ejecting face through the collecting hole and collects the overflowed liquid through the collecting hole together with the adherent liquid.

Abstract: An ejection surface cleaning apparatus for cleaning a liquid ejection surface of a liquid ejection head ejecting an ejection liquid, includes: a cleaning liquid deposition device which deposits a cleaning liquid that dissolves or redisperses the ejection liquid, onto the liquid ejection surface; a wiping device which wipes the liquid ejection surface onto which the cleaning liquid has been deposited; and a control device which controls a leave time from deposition of the cleaning liquid onto the liquid ejection surface until wiping performed by the wiping device.

Abstract: The recording head cleaning apparatus cleans a nozzle surface of a recording head that is disposed at an inclination with respect to horizontal. The recording head cleaning apparatus includes: an application roller having a substantially conical shape of which a circumferential surface holds cleaning liquid and has an inclination corresponding to the inclination of the nozzle surface, an axis of the substantially conical shape being a rotational axis of the application roller; and a rotating device which rotates the application roller on the rotational axis to apply the cleaning liquid to the nozzle surface while not making the application roller in contact with the nozzle surface.

Abstract: Inkjet apparatus includes: a tank; a first flow channel; a first liquid chamber; a second flow channel; a second liquid chamber; a first liquid movement; a second liquid movement device; a first pressure determination device; a second pressure determination device; a pressure control device which controls pressures in the first and second liquid chambers by respectively controlling the first and second liquid movement devices, in accordance with determination results of the first and second pressure determination devices, in such a manner that the internal pressures of the first and second liquid chambers respectively remain at the target pressures; a circulation path through which the liquid inside the first liquid chamber is circulated without passing through the inkjet head; and a deaeration device which is provided at an intermediate point of the circulation path and which removes dissolved gas.

Abstract: The ink-jet recording device includes an image forming section where an active energy ray-curable ink is ejected onto a recording medium to form an image, and an image curing section which includes at least one light irradiation unit having a fluorescent lamp and which cures the ink on the recording medium upon exposure to active energy rays. The fluorescent lamp has a bulb, a reflective film formed on a bulb inner wall and having a first aperture formed on a recording medium side, and a phosphor film formed on the reflective film and the bulb inner wall and having a second aperture formed on the recording medium side. The formulas: ?<?, 60°???150° and 30°???90° where ? represents a first aperture angle of the first aperture and ? represents a second aperture angle of the second aperture are satisfied.

Abstract: A UV curable ink-jet recording apparatus includes: a recording medium transporting unit; an ink-jet head; and a UV irradiating unit, wherein the apparatus includes a light capturing portion between the UV irradiating unit and the ink-jet head, at least a part of the light capturing portion as seen in a longitudinal section taken vertically along a direction of transporting the recording medium has an opened wedge shape having no base side and comprising: a side vertical to the recording medium; and an oblique side which is in contact with a top of the vertical side, and which extends obliquely downward, the vertical side is located on the side of the ink-jet head, and the oblique side downward extends from the top toward the UV irradiating unit.

Abstract: The invention is directed to an ink-jet recording apparatus including: a recording medium transport unit as defined herein; a full-line ink-jet head as defined herein; and an ultraviolet light illumination unit as defined herein, wherein the ultraviolet light illumination unit comprises an aperture-type hot-cathode tube, or an ultraviolet-setting ink-jet recording apparatus including: a recording medium transport unit as defined herein; and ink-jet head as defined herein; and an ultraviolet light illumination unit as defined herein, wherein: the ultraviolet light illumination unit comprises plural aperture-type hot-cathode tubes and apertures of at least one set of aperture-type hot-cathode tubes are rotated so that an overlap of their illumination regions is increased.