Patents Assigned to Riso Kagaku Corporation
  • Patent number: 10293599
    Abstract: The present invention discloses a method for producing a decorative article which includes a step of performing inkjet printing onto the surface of a humidity-conditioning base material using an aqueous inkjet ink containing at least water, a water-dispersible resin and a colorant, and also discloses a device for producing the decorative article.
    Type: Grant
    Filed: November 28, 2014
    Date of Patent: May 21, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Hirotaka Yamamoto, Sayako Arai, Mamoru Saito, Ami Terakado, Akiko Hayashi
  • Patent number: 10291818
    Abstract: A calculator performs in parallel gamma correction calculations on gray level values 1 to Z depending on each of target nozzles for each of target pixels containing gray level values other than zero of pixels in image data to be printed by a multi-drop inkjet head including nozzles and having a maximum droplet number Z per pixel, the nozzles of the multi-drop inkjet head including the target nozzles for ink ejection on the respective target pixels. A selector selects a calculation result corresponding to a gray level value of the target pixel from calculation results of the gamma correction calculations performed on the gray level values 1 to Z by the calculator, for each of the target pixels.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: May 14, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Yasutaka Sasaki
  • Patent number: 10286678
    Abstract: An inkjet printer includes: a closing unit configured to close at least part of an ink passage connected to an inkjet head to form a closed passage; a negative pressure generator configured to generate a negative pressure in the closed passage; an ink deliverer configured to deliver ink to the inkjet head via the ink passage; and a controller. The controller: drives the closing unit to form the closed passage; drives the negative pressure generator to generate the negative pressure in the closed passage; and, upon the negative pressure in the closed passage reaching a prescribed pressure, stops the negative pressure generator while driving the closing unit to release closure of the at least part of the ink passage, and drives the ink deliverer to discharge an air bubble together with the ink in the at least part of ink passage from the inkjet head.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: May 14, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Katsuhiko Matsunaga
  • Publication number: 20190126623
    Abstract: An inkjet printer includes: an inkjet head including nozzles and a nozzle surface tilted in a tilt direction with respect to a horizontal plane; a purging unit configured to discharge ink from the nozzles and attach the discharged ink to the nozzle surface; and a wiper configured to wipe the nozzle surface in a wiping direction orthogonal to the tilt direction. At least a portion of the wiper including an end of the wiper on a lower side in the tilt direction is tilted or curved toward a downstream side in the wiping direction toward the lower side in the tilt direction. The portion of the wiper is configured to wipe the nozzle surface while pushing the ink attached to the nozzle surface from the lower side to an upper side in the tilt direction.
    Type: Application
    Filed: October 26, 2018
    Publication date: May 2, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Akira NISHIYAMA
  • Publication number: 20190127163
    Abstract: A sheet supplying device includes: an air blow opening configured to blow air to a side portion of an uppermost part of stacked sheets; and a flow adjuster extending from above the air blow opening over an edge of a top sheet of the stacked sheets and configured to cause an air flow blown from the air blow opening to travel along an upper surface of the top sheet of the stacked sheets.
    Type: Application
    Filed: October 30, 2018
    Publication date: May 2, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Masayoshi SAKAMOTO, Yoshihisa MORITA, Naoya MASUDA, Toru SAKABE
  • Publication number: 20190118548
    Abstract: A halftone processing of an image processing apparatus includes: performing a drop-less halftone processing on image data of each color corresponding to one or more ink colors including at least one selected from all ink colors of an inkjet printer in descending order of lightness of the all ink colors, the drop-less halftone processing having a minimum drop number per pixel greater than a minimum drop number per pixel in a normal halftone processing of generating drop data having a number of levels corresponding to a maximum drop number per pixel; and performing the normal halftone processing on image data of each color corresponding to the other ink colors other than the one or more ink colors.
    Type: Application
    Filed: February 14, 2017
    Publication date: April 25, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Kenji SHIMOMURA
  • Patent number: 10259214
    Abstract: An image forming device includes an inkjet head unit, a count acquiring section, a determining section, and a head controlling section. The inkjet head unit includes an element. The count acquiring section acquires, based on job data, an element operation count of the element. The determining section determines whether the element operation count is equal to or greater than a warning threshold count that is smaller by a predetermined count than a life threshold count corresponding to a life end point of the element. The head controlling section controls, when the element operation count is equal to or greater than the warning threshold count, the inkjet head unit to form an image by suppressing the element operation count.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: April 16, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Atsushi Takata
  • Patent number: 10255007
    Abstract: A printing machine includes a scanning unit, a storing unit, a determination section, and an editing section. The scanning unit reads a set of original images from an original composed of a plurality of pages and reads a set of editing images from an original-for-editing for editing the original. The storing unit stores the read set of original images and the read set of editing images in units of pages. When an editing mode is set, the determination section determines whether or not there are original images that correspond to a first editing image which is a first page and a last editing image which is a last page of the original-for-editing stored in the storing unit, among the set of original images stored in the storing unit. The editing section edits the set of original images using the set of editing images based on a result of the determination.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: April 9, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Yoshifumi Sugiyama
  • Publication number: 20190100671
    Abstract: An oil-based inkjet ink set is disclosed that includes: an oil-based inkjet ink A containing a non-aqueous solvent, the non-aqueous solvent of the oil-based inkjet ink A containing at least 15% by mass of a silicone oil relative to the total mass of the non-aqueous solvent of the oil-based inkjet ink A, and an oil-based inkjet ink B containing a non-aqueous solvent, the non-aqueous solvent of the oil-based inkjet ink B containing at least 50% by mass of a petroleum-based hydrocarbon solvent relative to the total mass of the non-aqueous solvent of the oil-based inkjet ink B. A method for producing a printed item is also disclosed.
    Type: Application
    Filed: September 25, 2018
    Publication date: April 4, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Marie MORINAGA, Toshihiro ENDO, Shinichiro SHIMURA, Kazuyuki ANDO, Hikaru SUGIURA, Shinsuke OZAWA
  • Publication number: 20190100668
    Abstract: A method for producing a printed item including discharging two or more inks by an inkjet method toward a recording medium to form an image is disclosed, wherein the two or more inks include a first oil-based inkjet ink containing a first colorant and a non-aqueous solvent and having an ink surface tension of less than 27.0 mN/m, and a second oil-based inkjet ink containing a second colorant and a non-aqueous solvent and having an ink surface tension of 27.0 mN/m or greater, and the method includes discharging the first oil-based inkjet ink toward the recording medium at a discharge volume of at least 20 pl per one liquid droplet to form dots with the first oil-based inkjet ink, and subsequently discharging the second oil-based inkjet ink toward the recording medium at a discharge volume of less than 20 pl per one liquid droplet so as to overlap with the dots formed with the first oil-based inkjet ink.
    Type: Application
    Filed: September 25, 2018
    Publication date: April 4, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Kazuyuki ANDO, Shinichiro SHIMURA, Marie MORINAGA, Hikaru SUGIURA, Shinsuke OZAWA
  • Publication number: 20190100400
    Abstract: A conveying apparatus includes: a conveyor configured to convey a web while unwinding the web from a web roll; a brake configured to apply brakes to rotation of the web roll; and a controller configured to perform control to unwind the web from the web roll and convey the web with the conveyor while giving tension to the web by applying brakes to the rotation of the web roll using torque of the brake. The controller is configured to determine the torque of the brake during deceleration of the web to be a value depending on an inertial load of the web roll.
    Type: Application
    Filed: September 21, 2018
    Publication date: April 4, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Hideaki INOUE, Manabu TACHI
  • Publication number: 20190100002
    Abstract: An inkjet printer includes: an oil-based ink containing silicone oil; and inkjet heads each including a nozzle row in which nozzles configured to eject the oil-based ink to a print medium conveyed in a conveyance direction are arranged, the inkjet heads being arranged adjacent to each other with the nozzles in each nozzle row arranged in a direction non-orthogonally intersecting the conveyance direction.
    Type: Application
    Filed: August 8, 2018
    Publication date: April 4, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Shinsuke OZAWA, Shinichiro SHIMURA, Marie MORINAGA, Kazuyuki ANDO, Hikaru SUGIURA
  • Publication number: 20190100399
    Abstract: A conveying apparatus includes: a conveyor including a brake to apply brakes to a web, the conveyor configured to convey the web while giving tension to the web by applying brakes to the web using torque of the brake; and a controller configured to control the conveyor. The controller performs at least one of a first control or a second control. The first control includes determining a first torque of the brake during acceleration of the web to be a value depending on a first inertial load at the conveyor during the acceleration of the web. The second control includes determining a second torque of the brake during deceleration of the web to be a value depending on a second inertial load at the conveyor during the deceleration of the web.
    Type: Application
    Filed: September 21, 2018
    Publication date: April 4, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Hideaki INOUE, Manabu TACHI
  • Publication number: 20190092021
    Abstract: An inkjet head maintenance mechanism includes: an inkjet head including a nozzle plate with ejection ports arranged in the nozzle plate and configured to eject droplets of ink, and a protection plate stacked on the nozzle plate and having an opening formed at a position corresponding to the ejection ports and exposing the ejection ports to an outside; a cap configured to come into contact with the protection plate and surround the opening of the protection plate; and a controller configured to detect an on-off state of a power supply of an inkjet printer to which the inkjet head is attached and adjust a contact pressure of the cap onto the protection plate depending on the detected on-off state of the power supply.
    Type: Application
    Filed: September 19, 2018
    Publication date: March 28, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Katsuhiko MATSUNAGA, Mamoru SAITO
  • Patent number: 10223056
    Abstract: A printing control machine includes an obtaining section, a determination section, and a printing control section. The obtaining section obtains from each of a plurality of printing machines, ink information regarding an ink mounted to the each printing machine. The determination section determines whether or not each of the plurality of printing machines is within a similarity condition range on the basis of the ink information obtained by the obtaining section. The printing control section allocates a printing job to printing machines determined to be within the similarity condition range to make the determined printing machines perform printing.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: March 5, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Atsushi Takata
  • Publication number: 20190062095
    Abstract: A conveying apparatus includes: a first roller and a second roller configured to convey a print sheet while nipping the print sheet at a nip pressure; an adjustor supporting the first roller and the second roller in a manner capable of adjusting an inter-axial distance between the first roller and the second roller, the adjustor being configured to apply a biasing force biasing the second roller toward the first roller and capable of adjusting the biasing force; and a controller configured to control the nip pressure by driving the adjustor to adjust the biasing force.
    Type: Application
    Filed: August 13, 2018
    Publication date: February 28, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Kenji KUDO
  • Patent number: 10209930
    Abstract: A printer includes: an image former configured to form an image on a sheet based on a print job; a processor; and a memory including instructions that, when executed by the processor, cause the processor to perform operations. The operations include: comparing first time information indicating time information set for a region where the printer is allowed to be present and second time information indicating time information in a region where the printer is currently present and determining whether a time difference between the first time information and the second time information is greater than a predetermined time, and upon determining that the time difference is greater than the predetermined time, calling for execution of maintenance of the printer and selectably displaying options of the execution of the maintenance of the printer and execution of limited print processing by the image former.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: February 19, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Takahiro Fushimi, Takaomi Ueda
  • Publication number: 20190047306
    Abstract: A printing apparatus includes: a case having a door; a duct installed on an inner side of the door in the case and communicating with an outside of the case; a cover installed in the case and having an opening, the opening allowing an inside of the case and the outside of the case to communicate with each other via the duct of the door being closed; a fan configured to perform at least one of drawing of air into the case or exhausting of air from the case via the opening and the duct with the door being closed; and a shutter configured to open the opening during drive of the fan and close the opening while the door is open.
    Type: Application
    Filed: June 29, 2018
    Publication date: February 14, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Naoki SASAKI
  • Patent number: 10196227
    Abstract: A sheet folding device includes first and second folding rollers as a pair arranged on a sheet transfer path located downstream of a printing unit and configured to form a fold on a printed sheet. At least the first folding roller includes a small-diameter portion formed at a position corresponding to a range of a width of a separating roller in the sheet width direction, and a large-diameter portion formed at a position other than the position of the small-diameter portion.
    Type: Grant
    Filed: November 18, 2014
    Date of Patent: February 5, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Kunihiro Maeda
  • Patent number: D841607
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: February 26, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Hiroyuki Sunagawa