Patents Assigned to Riso Kagaku Corporation
  • Publication number: 20210284471
    Abstract: A controller drives a floating unit and a conveyor to perform a sheet feed operation, during the sheet feed operation, acquires an amount of received light at a detector during floating of sheets floated by the floating unit each time each sheet is conveyed by the conveyor, and perform a following control of lifting a stacking tray upon the acquired amount of received light being less than a threshold value. The controller, after start of the sheet feed operation, samples amounts of received light at the detector during floating of the sheets floated by the floating unit, performs a threshold value determination process of determining the threshold value by using the sampled amounts of received light, and starts the following control upon determining the threshold value.
    Type: Application
    Filed: March 2, 2021
    Publication date: September 16, 2021
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Miki OKAWARA
  • Patent number: 11110711
    Abstract: A liquid agent mist recovery device for a liquid agent application device prevents dripping of a droplet formed from a sucked liquid agent mist onto a sheet. The ink mist recovery device installed downstream of an inkjet head includes a recovery casing with an opening for introducing the mist. The opening is communicated with a recovery hole connected to a suction fun, and positioned apart from an upstream wall surface by a distance corresponding to receiving portions for receiving a droplet trickling from the wall surface, and apart from a downstream wall surface so that air introduced from downstream obstructs the flow of the upstream liquid agent mist for guiding into the recovery hole. The liquid agent mist from upstream is securely introduced and recovered. The liquid agent mist trickling from the wall surface of the recovery hole is received by the receiving portion rather than dripping onto the sheet.
    Type: Grant
    Filed: February 19, 2020
    Date of Patent: September 7, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Shunta Nakamura
  • Patent number: 11110713
    Abstract: A transfer device includes: a first container including a bag portion configured to house liquid; a second container configured to house the liquid transferred from the first container; a transfer unit configured to transfer the liquid from the first container to the second container; and a controller configured to control the transfer unit to intermittently and repeatedly execute a transfer operation of starting transfer of the liquid and then completing the transfer before a side of the bag portion toward the transfer unit transitions to a suction contact state upon transferring the liquid from the first container to the second container.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: September 7, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Takehiro Yamori
  • Publication number: 20210261369
    Abstract: A medium feeding apparatus includes: a placement mount on which a plurality of media are placed; a transportation mechanism that transports an uppermost medium of the plurality of media placed on the placement mount; a floating-air blowout mechanism that blows out air to float at least the uppermost medium; a suction mechanism that sucks air to cause the uppermost medium floated by the floating-air blowout mechanism blowing out air to be attracted to the transportation mechanism; and a floating-air control unit that causes the floating-air blowout mechanism to start to blow out air while the uppermost medium is being attracted to the transportation mechanism after starting to be transported by the transportation mechanism, so as to float at least a second medium located below the uppermost medium, and causes the floating-air blowout mechanism to stop blowing out air before the second medium starts to be transported by the transportation mechanism.
    Type: Application
    Filed: January 21, 2021
    Publication date: August 26, 2021
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Yoshihisa MORITA, Yoshiyuki OKADA
  • Patent number: 11097548
    Abstract: A tank includes: a liquid container configured to store a liquid; an inlet opening through which the liquid flows into the liquid container; an outlet opening through which the liquid flows out from the liquid container; and a channel formation member arranged between the inlet opening and the outlet opening and configured to form channels. Widths of the channels are such that a channel at a position where stagnation of the liquid is more likely to occur has a larger width.
    Type: Grant
    Filed: January 17, 2020
    Date of Patent: August 24, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Hiroshi Sugitani, Toshihiro Bansyo, Takehiro Yamori
  • Patent number: 11090943
    Abstract: An ink mist recovery device allows suction of ink mist with uniform suction force irrespective of a position on a confronting sheet. The ink mist recovery device includes a recovery casing having multiple suction ports confronting a sheet, and a suction unit connected to the recovery casing. At least one of a size of each of the suction ports and a first suction distance from each of the suction ports to a suction slit is set in accordance with a second suction distance from the suction unit to the suction slit via each of the suction ports so that the suction force is kept uniform at the respective positions on the sheet corresponding to the suction ports. The mist suction force is made uniform over the entire width of the suction slit to improve quality of the printed image without sucking ink droplets required to land.
    Type: Grant
    Filed: February 18, 2020
    Date of Patent: August 17, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Shunta Nakamura
  • Publication number: 20210237999
    Abstract: A medium ejection apparatus including: a placement mount on which media are placed; a medium-leading-edge position restriction part that moves between a restriction position at which the restriction part restricts a position of a leading edge portion of a medium ejected toward the placement mount with reference to an ejection direction of the medium and a retracted position retracted from the restriction position; and a medium position control unit that controls the medium-leading-edge position restriction part such that the medium-leading-edge position restriction part performs a leading-edge restriction operation of moving from the retracted position to the restriction position and moving from the restriction position to the retracted position when the medium-leading-edge position restriction part and an upper surface of a medium are not in contact with each other.
    Type: Application
    Filed: January 7, 2021
    Publication date: August 5, 2021
    Applicant: RISO KAGAKU CORPORATION
    Inventor: Hisayuki TAKAHASHI
  • Patent number: 11077691
    Abstract: A method for producing printed matter is disclosed that includes applying a pretreatment liquid containing a resin and a pretreatment liquid containing a coagulant to a substrate, and after the applying of these pretreatment liquids, applying an aqueous inkjet ink to the substrate using an inkjet system.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: August 3, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Yuki Urano, Akiko Hayashi, Mamoru Fukuda
  • Patent number: 11068216
    Abstract: A print data generating apparatus includes a machine learning unit that has a learned model which is obtained by inputting and conducting machine teaming of the relationships among data size of document data of a plurality of print jobs, print setting conditions, RIP setting conditions and printing speeds when the document data are printed by a printing unit; a printing speed predicting unit that predicts the printing speed of a print job to be printed by inputting the data size of the document data of the print job to be printed, the print setting conditions, and arbitrary RIP setting conditions into the learned model; and an optimized RIP setting condition determining unit that determines optimized RIP setting conditions that result in the printing speed which is predicted by the printing speed predicting unit approaching or becoming greater than or equal to a processing seed of the printing unit.
    Type: Grant
    Filed: May 18, 2020
    Date of Patent: July 20, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Keiichiro Ishi
  • Patent number: 11059687
    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: Grant
    Filed: October 30, 2018
    Date of Patent: July 13, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Masayoshi Sakamoto, Yoshihisa Morita, Naoya Masuda, Toru Sakabe
  • Patent number: 11053406
    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: Grant
    Filed: June 27, 2019
    Date of Patent: July 6, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Akiko Hayashi, Takahisa Yamazaki, Kokoro Kinoe
  • Patent number: 11046543
    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: Grant
    Filed: May 17, 2019
    Date of Patent: June 29, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Manabu Tachi
  • Patent number: 11040559
    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: Grant
    Filed: March 27, 2019
    Date of Patent: June 22, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Tadashi Takakusa
  • Patent number: 11040556
    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: Grant
    Filed: August 13, 2019
    Date of Patent: June 22, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Atsushi Takata
  • Patent number: 11021624
    Abstract: An oil-based magnetic ink can be provided that has low viscosity and improved storage stability. Specifically disclosed is an oil-based magnetic ink containing a magnetic pigment that contains a ferrite, a pigment dispersant A that has an acid value but has no base value, a pigment dispersant B that has an acid value and a base value, and a non-aqueous solvent. One example of the pigment dispersant A is at least one compound selected from the group consisting of hydroxystearic acid and polyhydroxystearic acid. One example of the pigment dispersant B has an acid value of at least 5 mgKOH/g.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: June 1, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Kenji Yamada, Naofumi Ezaki, Yoshifumi Watanabe
  • Publication number: 20210155428
    Abstract: A transportation apparatus includes a plurality of transportation members that are arranged in a transportation direction for a medium and transport the medium, a plurality of actuators that drive the plurality of transportation members, and a processor that controls the plurality of actuators in such a manner as to increase transportation velocities of the plurality of actuators in order from actuators for driving transportation members on a downstream side in the transportation direction to actuators for driving transportation members on an upstream side in the transportation direction.
    Type: Application
    Filed: November 16, 2020
    Publication date: May 27, 2021
    Applicant: RISO KAGAKU CORPORATION
    Inventors: Ryuichi SHIBATA, Miki OKAWARA
  • Patent number: 11001469
    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: Grant
    Filed: October 5, 2017
    Date of Patent: May 11, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Hiroyuki Nakamura
  • Patent number: 10995230
    Abstract: An aqueous pigment ink for textile inkjet printing is disclosed that contains a pigment, a first water-dispersible resin, a second water-dispersible resin and water, wherein the first water-dispersible resin is at least one resin selected from the group consisting of a water-dispersible urethane resin, a water-dispersible (meth)acrylic resin and a water-dispersible styrene/(meth)acrylic resin, the second water-dispersible resin is a water-dispersible polyester resin, the total amount of the first water-dispersible resin and the second water-dispersible resin is from 2 to 18% by mass relative to the total mass of the ink, and the mass ratio of the second water-dispersible resin relative to the first water-dispersible resin (second water-dispersible resin/first water-dispersible resin) is from 0.1 to 5.0. A method for producing a printed textile item and an ink set are also disclosed.
    Type: Grant
    Filed: August 20, 2018
    Date of Patent: May 4, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Takahisa Yamazaki, Akiko Hayashi, Shunsuke Uozumi, Kokoro Kinoe
  • Patent number: 10987948
    Abstract: A controller performs control to: print a test pattern on a print medium, the test pattern including: a head reference straight line extending in a main scanning direction and printed by a reference print head; and head adjustment straight lines extending in the main scanning direction and printed by each of non-reference print heads at timings corresponding to timing adjustment values; and in response to input of information specifying the head adjustment straight line with a smallest print misalignment amount in the sub-scanning direction with respect to the head reference straight line for each of the non-reference print heads, determine, for each of the non-reference print heads, the timing adjustment value corresponding to the head adjustment straight line specified by the input information as an adjustment value of an ink ejection timing in the non-reference print head in normal printing.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: April 27, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventor: Takashi Ebisawa
  • Patent number: RE48686
    Abstract: A head holder has an opening through which a space between the head holder and a conveyer communicates with an inside of the head holder. Ahead cooler includes a blower configured to blow air into the head holder from an outside of the head holder with a flow rate of blow air and a suction unit configured to suction air from the head holder with a flow rate of suction air. The head cooler generates cooling air for cooling an ink-jet head inside the head holder by the blower and the suction unit. A controller controls the flow rate of blow air and the flow rate of suction air such that air containing ink mist is suctioned into the head holder through the opening.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: August 17, 2021
    Assignee: RISO KAGAKU CORPORATION
    Inventors: Shinichiro Otsuka, Hirohito Kubota