Patents Assigned to Riso Kagaku Corporation
  • Publication number: 20180173480
    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: Application
    Filed: December 12, 2017
    Publication date: June 21, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Atsushi TAKATA
  • Patent number: 10000068
    Abstract: A controller changes a droplet number larger than a second maximum droplet number among droplet numbers in first droplet data for each ink color to the second maximum droplet number. The controller, for each of certain pixels with a droplet number of black decreased to the second maximum droplet number, performs at least one of a first processing or a second processing. The first processing includes distributing a droplet number subtracted to decrease the droplet number of black to pixels surrounding the certain pixel in the first droplet data for black. The second processing includes adding the subtracted droplet number to a droplet number for the certain pixel in the first droplet data for a color other than black.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: June 19, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Daisuke Fujiwara
  • Patent number: 10003721
    Abstract: An image processing method comprising: converting an RGB input signal to a CMYK signal; converting the RGB input signal to a common color signal including lightness; generating a first Gray signal including a Gray value substituted for CMY values forming gray in the CMYK signal; generating a second Gray signal including a Gray value corresponding to a K value greater than a threshold in the CMYK signal; generating a Gray output signal in a CMYKGray output signal indicating color material amounts of cyan (C), magenta (M), yellow (Y), black (K), and gray (Gray) for printing by multiplying the generated first Gray signal and the generated second Gray signal respectively by coefficients corresponding to the lightness in the common color signal and then synthesizing the first Gray signal and the second Gray signal.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: June 19, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Kenji Shimomura
  • Patent number: 9994059
    Abstract: When data about plural book sheets, each belonging to one of plural chapters, are edited to bind the plural book sheets by a casing-in operation in such a manner that chapter range images, which indicate the respective ranges of the plural chapters, are displayed on an edge so that the chapter range images that are adjacent to each other are arranged at different positions from each other in the top-bottom direction, a marker image emphasizing the chapter range image is adjacent to the chapter range image indicating the range of a chapter having book sheets the number of which is less than or equal to a predetermined threshold.
    Type: Grant
    Filed: February 25, 2013
    Date of Patent: June 12, 2018
    Assignee: Riso Kagaku Corporation
    Inventors: Asuka Araki, Ayako Kawano, Mayumi Okawa, Kouichi Nobushima, Hideo Nakao
  • Publication number: 20180147855
    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: Application
    Filed: November 14, 2017
    Publication date: May 31, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Katsuhiko MATSUNAGA
  • Patent number: 9981490
    Abstract: A print system includes a first printer which performs printing on a sheet while conveying the sheet and a second printer which receives the sheet conveyed from the first printer and performs printing on the sheet while conveying the sheet. The second printer includes a second printing unit, a second registration roller, a second pre-registration roller, a sheet detector, and a second controller. The second controller controls an operation of the second pre-registration roller and an operation of the second registration roller based on a timing of a detection of the sheet by the sheet detector.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: May 29, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Hideaki Inoue, Hirokazu Yabune
  • Publication number: 20180141354
    Abstract: A printing apparatus includes: a sheet discharge tray having an upstream portion tilted to extend downward in a direction of gravity; an upper member limiting a height of a space above the sheet discharge tray; a full sensor configured to detect an upstream end of a top sheet of sheets stacked on the sheet discharge tray; a counter configured to count a number of the sheets discharged onto the sheet discharge tray; and a controller. The controller determines whether to stop discharging of the sheets to the sheet discharge tray, based on a detection result of the full sensor upon the sheets to be stacked on the sheet discharge tray including only sheets each with uniform thickness and based on a count value of the counter upon the sheets to be stacked on the sheet discharge tray including a sheet with thickness varying partly.
    Type: Application
    Filed: November 9, 2017
    Publication date: May 24, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Hirokazu YABUNE
  • Publication number: 20180141331
    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: Application
    Filed: November 14, 2017
    Publication date: May 24, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Atsushi TAKATA
  • Publication number: 20180144787
    Abstract: A management device for a volatile semiconductor memory includes: a request generator configured to output a refresh request requesting a refresh operation of a target cell in the volatile semiconductor memory; and a refresh operator configured to execute the refresh operation of the target cell requested in the refresh request outputted by the request generator. The request generator repeatedly outputs the refresh request for a same target cell in the volatile semiconductor memory intermittently at unequal intervals with each two successive intervals being different from each other.
    Type: Application
    Filed: October 17, 2017
    Publication date: May 24, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Yuji YOSHINO
  • Patent number: 9963603
    Abstract: A colored resin particle dispersion and an ink are provided which exhibit excellent color development and abrasion resistance. Moreover, a colored resin particle dispersion and an inkjet ink are provided which exhibit excellent color development and abrasion resistance, together with excellent water resistance and marker resistance. Specifically provided are a colored resin particle dispersion containing colored resin particles, a basic dispersant, and a non-aqueous solvent, wherein the colored resin particles contain a colorant, and a phosphorylated solid resin and/or a nitrated solid resin. The phosphorylated solid resin may include a phosphorylated polyvinyl alcohol and/or a phosphorylated polyvinyl acetal, and the nitrated solid resin may include a nitrocellulose.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: May 8, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Yoshifumi Watanabe, Kazuyuki Ando, Manami Shimizu
  • Publication number: 20180117929
    Abstract: A printing apparatus includes: a conveyor including a first pair of conveyance rollers and a second pair of conveyance rollers each configured to nip and convey a sheet; a first jam releaser configured to separate rollers of the first pair of conveyance rollers from each other; a second jam releaser configured to separate rollers of the second pair of conveyance rollers from each other; and a controller configured to control the conveyor. In stopping sheet conveyance by the conveyor upon occurrence of a failure, the controller controls the conveyor to prevent a sheet from being nipped only by the first pair of conveyance rollers prior to separation of the rollers of the first pair of conveyance rollers from each other by the first jam releaser.
    Type: Application
    Filed: October 5, 2017
    Publication date: May 3, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Hiroyuki NAKAMURA
  • Patent number: 9951468
    Abstract: An aqueous inkjet ink set for textile printing is disclosed, the aqueous inkjet ink set including two or more aqueous inkjet inks that include a black ink, wherein among the charge density Cd values measured by the streaming potential method for the two or more aqueous inkjet inks, the Cd value (CdK) for the black ink is the highest, and the absolute value of the difference between the Cd value (CdK) for the black ink and the Cd value (Cd2) for the aqueous inkjet ink having the second highest Cd value is 80 ?eq/g or greater. A method for producing a printed item is also disclosed.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: April 24, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Sayako Arai, Yuki Urano, Shunsuke Uozumi, Hideki Imanishi, Takahisa Yamazaki
  • Patent number: 9944476
    Abstract: The rotational pin and the lock pin are laterally provided in the right and left first brackets that are fixed to the right and left side surfaces of the sheet loading tray respectively, and furthermore, the right and left second brackets are fixed to the right and left of the one side surfaces of the casing. When the sheet loading tray reaches the sheet loading position, the lock pin is made to enter the sheet loading tray lock groove formed on the right and left second brackets to thereby lock and hold the sheet loading tray at the sheet loading tray storage position, along with an action of rotating the sheet loading tray about the rotational pin fitting into the sheet loading tray support groove formed on the right and left second brackets from the sheet loading position to the sheet loading tray storage position.
    Type: Grant
    Filed: April 12, 2017
    Date of Patent: April 17, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Masaru Omori
  • Patent number: 9944483
    Abstract: A controller is configured to drive a conveying roller to allow a sheet to abut on a registration roller and stop, and to drive the registration roller to convey the sheet abutting on the registration roller to the printing unit at a set sheet interval. The controller is configured to control a conveying speed of the conveying roller based on a time from a first timing to a second timing, the first timing at which a preceding sheet conveyed from the registration roller to the printing unit exits the conveying roller, the second timing at which a following sheet reaches the conveying roller.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: April 17, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Hideaki Inoue, Masashi Hara
  • Patent number: 9944808
    Abstract: A non-aqueous pigment ink that includes a colorant and a non-aqueous solvent, wherein the colorant is a pigment complex of a pigment, a dispersant and an amine compound, the amine compound is a diamine and/or triamine comprising two or more primary and/or secondary amino groups within each molecule, and the dispersant comprises two or more reactive functional groups within each molecule that exhibit reactivity with the amino groups of the amine compound.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: April 17, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Shunsuke Uozumi, Ayako Mochizuki
  • Patent number: 9946503
    Abstract: There are provided: a tray information acquisition unit configured to acquire tray information indicating the size and direction of sheets stacked on a plurality of paper feed trays of a printing machine, and the number of remaining sheets; a number-of-pages calculator configured to calculate the number of print pages of the image data based on the print job; and a raster image processor configured to determine the direction of the image data based on the tray information and the number of print pages, and generate image data by performing a raster image processing.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: April 17, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Hideki Katabami
  • Patent number: 9937739
    Abstract: An inkjet printer includes a conveyer, a plurality of inkjet heads, a head cooler configured to generate cooling air and cool the plurality of inkjet heads by the generated cooling air, and a controller. The controller is configured to drive the plurality of inkjet heads to perform non-ejection drive on at least one of lines which involve no ink ejection, the non-ejection drive being driving of the plurality of inkjet heads to such a degree as to eject no ink. The controller is configured to determine a non-ejection drive ratio for each of the plurality of inkjet heads in accordance with a position of each of the plurality of inkjet heads, the non-ejection drive ratio being a ratio of lines on which the controller performs the non-ejection drive to the lines which involve no ink ejection.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: April 10, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Hiroyuki Nakamura
  • Patent number: 9937711
    Abstract: An inkjet printer includes plural inkjet heads that are aligned in a head alignment direction to form a head row, a blower that blows air to the head row from one side along the head alignment direction, and an aspirator that is disposed on an extended line of the head row and on the other side along the head alignment direction for aspirating air through its aspirator port. The aspirator includes a tubular duct that extends from the aspirator port toward the head row.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: April 10, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Shinichiro Otsuka
  • Patent number: 9937709
    Abstract: A surface treatment liquid for a porous sound-absorbing material, the surface treatment liquid comprising water and a colorant-fixing component, and the colorant-fixing component comprising at least one component selected from the group consisting of cationic water-dispersible resins, inorganic particles having a median size measured by a dynamic light scattering method of less than 1 ?m, and polyvalent metal salts.
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: April 10, 2018
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Sayako Arai, Hirotaka Yamamoto
  • Publication number: 20180095704
    Abstract: A controller performs a first processing including: at a predetermined timing, determining whether a first authentication code stored in a storage of a control board attached to a first control board attachment portion matches a second authentication code stored in a storage of a control board attached to a second control board attachment portion; upon determining that the first authentication code matches the second authentication code, allowing a printer to execute a print processing; and upon determining that the first authentication code does not match the second authentication code, prohibiting the printer from executing the print processing.
    Type: Application
    Filed: September 22, 2017
    Publication date: April 5, 2018
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Takaomi UEDA, Takahiro FUSHIMI