Patents Assigned to Riso Kagaku Corporation
  • PRINTING APPARATUS WITH PLURALITY OF SHEET FEED TRAYS
    Publication number: 20200070549
    Abstract: A printing apparatus includes: a printer; a sheet feeder including sheet feed trays; a sheet discharger to discharge and hold sheets printed by the printer; and a controller. Upon unloading of the sheets from the sheet discharger, the controller: determines whether to perform switching of a sheet feed source from a first sheet feed tray which is a latest sheet feed source of the sheet feed trays to a second sheet feed tray which is a sheet feed tray other than the first sheet feed tray of the sheet feed trays, based on a first sheet remaining amount in the first sheet feed tray and a second sheet remaining amount in the second sheet feed tray; and, upon determining to perform the switching, controls the sheet feeder to switch the sheet feed source from the first sheet feed tray to the second sheet feed tray.
    Type: Application
    Filed: August 13, 2019
    Publication date: March 5, 2020
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Atsushi TAKATA
  • CONVEYANCE DEVICE AND IMAGE INSPECTION DEVICE
    Publication number: 20200070498
    Abstract: A hanging prevention roller is installed between a first suction conveyance unit on an upstream side and a second suction conveyance unit. When an inspection object is sent from the first suction conveyance unit into the second suction conveyance unit, a top edge of the inspection object abuts on and runs on the hanging prevention roller before the top edge of the inspection objects hangs down under its own weight or due to downward curling and so forth, the top edge is sandwiched between the roller and the second suction conveyance unit, and thereby stable suction conveyance is started without delay.
    Type: Application
    Filed: August 27, 2019
    Publication date: March 5, 2020
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Muneaki KAWAI
  • Ink jet head module
    Patent number: 10576747
    Abstract: The ink jet head module includes: at least one ink jet head that ejects ink; an ink path that supplies ink to the ink jet head; a joint for connecting the ink path and a fitting portion of a printing apparatus main body; a handle which is operated according to attachment and detachment of the ink jet head module to the printing apparatus main body; and a fitting mechanism that inserts and extracts the fitting portion of the printing apparatus main body into and out from the joint in response to movement of the handle.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: March 3, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Mutsumi Kubota
  • Printing apparatus capable of performing printing on partially-thick sheets
    Patent number: 10576761
    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: Grant
    Filed: November 9, 2017
    Date of Patent: March 3, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Hirokazu Yabune
  • CONVEYING APPARATUS
    Publication number: 20200062527
    Abstract: A conveying apparatus that carries in a web to he wound in a rolled state or unrolls and carries out the web wound in a rolled state includes a movable roller capable of moving in a vertical direction that is arranged between a carry-in port or a carry-out port of the web and the web wound in a rolled state to apply a tensile force to the web, and a movable-roller holding unit that releases the tensile force by a holding stand that holds the movable roller so as not to fall, at a time of replacement of the web.
    Type: Application
    Filed: July 31, 2019
    Publication date: February 27, 2020
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Kazuyuki AOKI
  • Inkjet printer using oil-based ink
    Patent number: 10569546
    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: Grant
    Filed: August 8, 2018
    Date of Patent: February 25, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Shinsuke Ozawa, Shinichiro Shimura, Marie Morinaga, Kazuyuki Ando, Hikaru Sugiura
  • INKJET PRINTER WITH INKJET HEADS IN OVERLAPPING ARRANGEMENT
    Publication number: 20200055310
    Abstract: An inkjet printer includes first and second inkjet heads arranged to partially overlap each other in a main scanning direction and configured to eject ink to a print medium conveyed in a direction orthogonal to the main scanning direction and a controller. The controller is configured to perform a distribution processing of distributing a number of drops of ink for each of pixels in an image to be printed by an overlap portion of the first inkjet head and the second inkjet head based on a random number between first nozzles of the first inkjet head and second nozzles of the second inkjet head overlapping each other.
    Type: Application
    Filed: March 5, 2018
    Publication date: February 20, 2020
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Mamoru WAKABAYASHI
  • LIQUID COLLECTION DEVICE WITH SUCTIONER FOR SUCKING LIQUID
    Publication number: 20200016897
    Abstract: A liquid collection device includes: a suction tank configured to suck and collect liquid accumulated in a liquid reservoir; a suction passage connecting the liquid reservoir and an inlet opened in a lower portion of the suction tank to each other; a suctioner configured to generate a negative pressure in the suction tank and suck the liquid from the liquid reservoir into the suction tank via the suction passage by using the generated negative pressure; and a controller configured to control the suctioner to terminate suction of the liquid into the suction tank upon continuance of a state where a pressure in the suction tank is equal to or greater than a threshold for a prescribed time or more after start of the suction.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 16, 2020
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Daichi KAGAYA
  • Printing apparatus for web
    Patent number: 10525752
    Abstract: A controller: generates a first corrected pulse signal by correcting a received first pulse signal or generate a second corrected pulse signal by correcting a received second pulse signal, based on a difference value between a first rotation cycle of a first roller and a second rotation cycle of a second roller such that a difference between a first pulse cycle of the received first pulse signal and a second pulse cycle of the received second pulse signal is reduced; upon generating the first corrected pulse signal, controls first print timings in respective first print mechanisms of a first printer based on the generated first corrected pulse signal; and upon generating the second corrected pulse signal, controls second print timings in respective second print mechanisms of a second printer based on the generated second corrected pulse signal.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: January 7, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Mamoru Wakabayashi
  • Paper supply apparatus
    Patent number: 10526152
    Abstract: A paper supply apparatus includes: a primary paper supply roller that feeds out and conveys a print medium from a paper tray on which the print medium is placed; resist rollers that a leading end of the print medium abuts to form a flexure in the print medium by temporarily ceasing conveyance, and rotate at a predetermined timing after this flexure is formed, to convey the print medium toward a conveyance mechanism; and a control unit that executes assist control that drives the primary paper supply roller during the time that the print medium is being conveyed by the resist rollers to assist conveyance of the print medium by the resist rollers. The control unit executes the assist control such that the flexure in the print medium remains at a point in time at which the leading end of the print medium reaches the conveyance mechanism.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: January 7, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Ryo Terakado
  • Image forming apparatus performing print processing in color or black-and-white print modes by analyzing pixel information of image data generated when a print job is input
    Patent number: 10528854
    Abstract: A print-mode determination processor determines the print mode of a print job that is described in a page description language (PDL) and that has a print mode set to an automatic determination mode, using image data generated for a preflight check by a preflight checker that performs a preflight check of image data of a print job. The image data for a preflight check has a resolution lower than that of thumbnail image data and sufficient to determine whether to set a color print mode or a black-and-white print mode, such as presence or absence of a color part in the image data of the print job or the degree of the color part, so that the time required for generating and analyzing image data for print mode determination can be shortened.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: January 7, 2020
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Shigeru Masuda
  • INK FOR INKJET TEXTILE PRINTING, INK SET, AND METHOD FOR PRODUCING PRINTED ITEM
    Publication number: 20200002561
    Abstract: An ink for inkjet textile printing is disclosed that contains a pigment, a water-dispersible urethane resin having a film elongation of 600% to 2,000%, a water-soluble organic solvent and water, wherein the weight ratio between the pigment and the water-dispersible urethane resin is from 1:3 to 1:16. An ink set and a method for producing a printed item are also disclosed.
    Type: Application
    Filed: June 27, 2019
    Publication date: January 2, 2020
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Akiko HAYASHI, Takahisa YAMAZAKI, Kokoro KINOE
  • DENSITY CORRECTION PROFILE GENERATION METHOD AND IMAGE FORMING DEVICE
    Publication number: 20200001618
    Abstract: Density of each pixel is specified from a test pattern for measurement of density distribution, a density profile indicating distribution of the specified density for each pixel is acquired, and a pixel region including a “nozzle of interest” having a certain density difference or more from surrounding pixels and pixels on both sides thereof is extracted as a nozzle region of interest from the acquired density profile. Filters B to E, other than a filter A to be applied for density smoothing processing of pixels that do not belong to the nozzle region of interest, are applied for the density smoothing processing of the pixels in the nozzle region of interest, to generate a profile of a density correction value for eliminating a density difference between respective pixels based on the density profile after the smoothing processing.
    Type: Application
    Filed: March 14, 2018
    Publication date: January 2, 2020
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Hironori INAGAWA
  • WEB CONVEYANCE DEVICE WITH BRAKE
    Publication number: 20190389683
    Abstract: A conveyance device includes: a conveyance mechanism configured to unwind and convey a web from a web roll; a brake configured to brake rotation of the web roll; a controller configured to perform control of gradually reducing a torque of the brake and then turning off the brake in an operation of turning off the brake in a state where conveyance of the web by the conveyance mechanism is stopped and the brake is on with a tension applied to the web between the web roll and the conveyance mechanism.
    Type: Application
    Filed: May 17, 2019
    Publication date: December 26, 2019
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Manabu TACHI
  • Image processing apparatus for ink jet printer
    Patent number: 10513126
    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: Grant
    Filed: February 14, 2017
    Date of Patent: December 24, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Kenji Shimomura
  • Inkjet head maintenance mechanism
    Patent number: 10500863
    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: Grant
    Filed: September 19, 2018
    Date of Patent: December 10, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Katsuhiko Matsunaga, Mamoru Saito
  • Inkjet printer
    Patent number: 10486431
    Abstract: An inkjet printer includes: a pressurized space and a depressurized space for circulation of ink along a circulation path; a main connection path and an adjustment path connecting the pressurized space and the depressurized space to each other; an air pump configured to send air from the depressurized space to the pressurized space though the main connection path or the adjustment path; a changeover device configured to change over between the main connection path and the adjustment path; and a controller. The controller drives the air pump with the main connection path being set to generate preset pressures respectively in the pressurized space and the depressurized space and then controls the air pump with the adjustment path being changed over to maintain pressures in the pressurized space and the depressurized space respectively at the preset pressures.
    Type: Grant
    Filed: September 6, 2016
    Date of Patent: November 26, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Hiroshi Sugitani
  • Ink jet printer provided with movable shuttle
    Patent number: 10457038
    Abstract: A controller forms an image on a print medium by alternately repeating: a first operation of driving an inkjet head to eject ink from the inkjet head to the print medium while driving a main scanning driver to move the inkjet head in a main scanning direction; and a second operation of driving a sub-scanning driver to move a shuttle in the sub-scanning direction. The controller performs a multi-stage brake control to stop the shuttle in the second operation, and in a second stage and a stage after the second stage of the multi-stage brake control, apply brake to the shuttle at such a timing that a direction of vibration of the shuttle and a direction of force of inertia of the shuttle in braking of the shuttle are opposite to each other.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: October 29, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Katsuhiko Matsunaga, Atsushi Tanaka
  • INK JET PRINTING APPARATUS
    Publication number: 20190299683
    Abstract: An ink jet printing apparatus includes: a conveying mechanism that moves at least one of a print medium and an ink jet head in a predetermined conveyance direction; a height information detecting unit that obtains information related to the height of the surface of the print medium; a moving mechanism that moves at least one of the ink jet head and the print medium upward and downward in the vertical direction; and a control unit that controls the ink jet head while sequentially controlling the moving mechanism accompanying conveyance by the conveying mechanism, based on the information related to the height which is detected by the height information detecting unit, thereby maintaining the distance between the print medium and the ink jet head to be within a range which is set in advance, to perform a printing process on the print medium.
    Type: Application
    Filed: March 27, 2019
    Publication date: October 3, 2019
    Applicant: Riso Kagaku Corporation
    Inventor: Tadashi TAKAKUSA
  • Portion of a container for an ink cartridge
    Patent number: D866659
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: November 12, 2019
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Hiroyuki Sunagawa