Abstract: Disclosed is an inkjet printing apparatus including a connection switching device in a housing having external suction ports and an internal suction port being disposed at an equal distance from the center of rotation of a switching section, the external suction ports being connectable to a plurality of lines, the internal suction port being connected to a suction path for sucking the interior of the housing. The connection switching device selectively connects any of the plurality of external suction ports to the suction device by rotating the switching section Consequently, when the switching section is connected to the internal suction port, the interior of the housing is sucked, whereby ink is sucked from all the inkjet nozzles.

Abstract: Disclosed is an inkjet printing apparatus including a connection switching device in a housing having external suction ports and an internal suction port being disposed at an equal distance from the center of rotation of a switching section, the external suction ports being connectable to a plurality of lines, the internal suction port being connected to a suction path for sucking the interior of the housing. The connection switching device selectively connects any of the plurality of external suction ports to the suction device by rotating the switching section Consequently, when the switching section is connected to the internal suction port, the interior of the housing is sucked, whereby ink is sucked from all the inkjet nozzles.

Abstract: Disclosed is an inspecting chart including a reference pattern containing a first line segment group and a second line segment group, a first-side deviation pattern, and a second-side deviation pattern. The first line segment group is formed by a plurality of first line segments printed by a reference printing head at a first given interval. The second line segment is formed by second line segments printed by a printing head on a center between two adjacent first line segments or a center of each of the first line segments, the printing head being spaced away from the reference printing head in a the transportation direction of a print medium. The first-side deviation pattern and the second-side deviation pattern are printed with various deviations.

Abstract: Provided is an inkjet printing apparatus discharging ink droplets onto a print medium to be transported successively for forming an image. The apparatus includes a print unit discharging the ink droplets onto the print medium to form the image, a heating roller disposed downstream of the print unit and winding the print medium for drying, and a downstream skew correcting device disposed downstream of the print unit and upstream of the heating roller, and correcting skew of the print medium.

Abstract: Provided is an inkjet printing apparatus including a first transport roller disposed on a transport path transporting a long print medium, a second transport roller disposed on the transport path downstream of the first transport roller, a print medium holder disposed downstream of the second transport roller, and a recording unit discharging ink droplets to a printing area of the print medium, and performing recording operation, the print medium being transported on the transport path. The first transport roller has a first winding angle upon contact to the print medium. The second transport roller has a second winding angle upon contact to the print medium. The first winding angle is larger than the second winding angle. The first winding angle is equal to or more than 75 degrees. The sum of the first and second winding angles is equal to or more than 80 degrees.

Abstract: Provided is a medium transport device transporting a medium. The medium transport device includes a skew correcting mechanism disposed on a transport path for transporting a long medium, a first transport roller disposed on the transport path and transporting the medium, and a second transport roller transporting the medium to the first transport roller. The first transport roller is disposed upstream of the skew correcting mechanism. The second transport roller is disposed upstream of and next to the first transport roller. The second transport roller contacts one surface of the medium, and the first transport roller contacts the other surface of the medium.

Abstract: Disclosed is an inkjet printing apparatus with an inkjet printing unit performing printing onto web paper to be transported. The apparatus includes a drive roller transporting the web paper, a transportation velocity detector detecting a transportation velocity of the web paper, an encoder generating a timing reference signal of the printing by the printing unit in accordance with transportation of the web paper, the encoder being disposed in a transport roller, a printing correction data generator generating printing correction data in accordance with the transportation velocity and the timing reference signal so as to correspond to a time-dependent variation of the transport roller provided with the encoder; and an offset corrector correcting the printing of the inkjet printing unit to the web paper in accordance with the printing correction data.

Abstract: A filter manufacturing apparatus includes a printing cell setting unit that sets, based on a predetermined filter pitch and a head resolution, printing cells having an equal number of dot areas in the direction perpendicular to the transport direction of the printing medium, a shift amount calculating unit that calculates shift amounts between the filter pitch and the printing cells in the direction perpendicular to the transport direction of the printing medium, a shift amount determining unit that determines whether shift amounts of the printing cells exceed a unit dot area; and a printing cell complementing unit that complements the shift amounts of the printing cells exceeding the unit dot area by adjusting the number of dot areas included in the printing cells.

Abstract: Disclosed is an inspecting chart including a reference pattern containing a first line segment group and a second line segment group, a first-side deviation pattern, and a second-side deviation pattern. The first line segment group is formed by a plurality of first line segments printed by a reference printing head at a first given interval. The second line segment is formed by second line segments printed by a printing head on a center between two adjacent first line segments or a center of each of the first line segments, the printing head being spaced away from the reference printing head in a the transportation direction of a print medium. The first-side deviation pattern and the second-side deviation pattern are printed with various deviations.

Abstract: A controller in the example of this invention operates to perform flushing by ejecting three types in size of ink droplets, i.e., smaller, middle and larger ink droplets, from each of nozzles. Then the controller operates an ink-droplet detector to perform an ejection test to detect ejection conditions. Thereafter, the controller operates an ink supply section to perform cleaning in accordance with results of the test. A combination in size of unejected ink droplets indicates a defective condition of the nozzle. Consequently, varying the degree of cleaning the nozzles in accordance with the size of the unejected ink droplets may achieve cleaning in a shorter time of period. As a result, time for cleaning the nozzle can be suppressed. This leads to a decreased proportion of maintenance to a starting time in an apparatus and increased availability of the apparatus.

Abstract: Provided is a printed matter for measuring printing precision of a printing apparatus configured to perform printing to both sides of a printing medium. The printed matter includes a plurality of positioning reference marks printed orthogonal to a transportation direction of the printing medium; and an inspecting window bored in a positioning reference mark of the plurality of positioning reference marks, the positioning reference mark corresponding to an object to be inspected. The printing medium is folded so as to make another positioning reference mark on the printing medium visible through the inspecting window, and the positioning reference mark on a side of the inspecting window is compared with the positioning reference mark visible through the inspecting window, whereby printing precision is measured.

Abstract: An inkjet printing apparatus carries out printing by moving an inkjet head and printing paper relative to each other. The inkjet head has a plurality of nozzles for discharging ink droplets. The apparatus includes a feed pipe connected to each nozzle of the inkjet head for feeding ink thereto, an ink feed control valve mounted on the feed pipe for controlling circulation of the ink, a cap for blocking the plurality of nozzles of the inkjet head, a decompression device for decompressing an inside of the cap, decompression piping for connecting the cap and the decompression device, a decompression control valve mounted on the decompression piping for controlling communication between the cap and the decompression device, and a controller.

Abstract: Web paper is transported by roll with two or more drive rollers. The two adjacent drive rollers each have difference in rotation speed in accordance with a draw ratio. Accordingly, tension is applied to the web paper. Tension of the web paper between the adjacent drive rollers is detected by a tension sensor. A tension controller controls the detected tension value so as to be a target tension value. A predictive control device predicts decrease in tension during an initial printing period where tension control is not stable, and increases rotation speeds of the drive rollers downstream of a print unit to suppress the decrease in tension. Consequently, tension acting on the web paper is appropriately controlled also during the initial printing period, resulting in possible reduction in printing quality.

Abstract: The present invention provides a printer and printing method that forms a lenticular lens or a transparent structure based on pseudo-embossment printing or the like on paper having penetrability, and an inkjet printer performs: with respect to a base material having a characteristic of being penetrated by radiation-curable ink, an undercoating step of using radiation-curable transparent ink to form a thin undercoat layer; an undercoat curing step of irradiating the formed undercoat layer with radiation to completely solidify the thrilled undercoat layer; a transparent structure forming step of using the radiation-curable transparent ink to form a spacer layer and microlens layer as a desired transparent structure on the solidified undercoat layer; and a transparent structure curing step of afterward further irradiating the radiation to cure the formed spacer layer and microlens layer.

Abstract: An inkjet printing apparatus is provided, which has a simple construction, and is yet capable of reducing ink consumption and cleaning inkjet heads promptly. The inkjet printing apparatus includes connector caps 51a-51l for connecting tubes communicating with suction caps, a cap support 54 supporting the connector caps 51a-51l, a switch element 60 for switching to a sucking state one of the connector caps 51a-51l to which the tubes are connected, and a stepping motor 57 for supporting and rotating the switch element 60.

Abstract: Provided is a printed matter for measuring printing precision of a printing apparatus configured to perform printing to both sides of a printing medium. The printed matter includes a plurality of positioning reference marks printed orthogonal to a transportation direction of the printing medium; and an inspecting window bored in a positioning reference mark of the plurality of positioning reference marks, the positioning reference mark corresponding to an object to be inspected. The printing medium is folded so as to make another positioning reference mark on the printing medium visible through the inspecting window, and the positioning reference mark on a side of the inspecting window is compared with the positioning reference mark visible through the inspecting window, whereby printing precision is measured.

Abstract: A controller in the example of this invention operates to perform flushing by ejecting three types in size of ink droplets, i.e., smaller, middle and larger ink droplets, from each of nozzles. Then the controller operates an ink-droplet detector to perform an ejection test to detect ejection conditions. Thereafter, the controller operates an ink supply section to perform cleaning in accordance with results of the test. A combination in size of unejected ink droplets indicates a defective condition of the nozzle. Consequently, varying the degree of cleaning the nozzles in accordance with the size of the unejected ink droplets may achieve cleaning in a shorter time of period. As a result, time for cleaning the nozzle can be suppressed. This leads to a decreased proportion of maintenance to a starting time in an apparatus and increased availability of the apparatus.

Abstract: Disclosed is an inkjet printing apparatus including a connection switching device in a housing having external suction ports and an internal suction port being disposed at an equal distance from the center of rotation of a switching section, the external suction ports being connectable to a plurality of lines, the internal suction port being connected to a suction path for sucking the interior of the housing. The connection switching device selectively connects any of the plurality of external suction ports to the suction device by rotating the switching section Consequently, when the switching section is connected to the internal suction port, the interior of the housing is sucked, whereby ink is sucked from all the inkjet nozzles.

Abstract: Web paper is transported by roll with two or more drive rollers. The two adjacent drive rollers each have difference in rotation speed in accordance with a draw ratio. Accordingly, tension is applied to the web paper. Tension of the web paper between the adjacent drive rollers is detected by a tension sensor. A tension controller controls the detected tension value so as to be a target tension value. A predictive control device predicts decrease in tension during an initial printing period where tension control is not stable, and increases rotation speeds of the drive rollers downstream of a print unit to suppress the decrease in tension. Consequently, tension acting on the web paper is appropriately controlled also during the initial printing period, resulting in possible reduction in printing quality.

Abstract: An inkjet printing apparatus carries out printing by moving an inkjet head and printing paper relative to each other. The inkjet head has a plurality of nozzles for discharging ink droplets. The apparatus includes a feed pipe connected to each nozzle of the inkjet head for feeding ink thereto, an ink feed control valve mounted on the feed pipe for controlling circulation of the ink, a cap for blocking the plurality of nozzles of the inkjet head, a decompression device for decompressing an inside of the cap, decompression piping for connecting the cap and the decompression device, a decompression control valve mounted on the decompression piping for controlling communication between the cap and the decompression device, and a controller.