Patents by Inventor Toshihide MAESAKA
Toshihide MAESAKA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9815301Abstract: An inkjet printer includes: a printing unit including an inkjet head and configured to eject an ink from the inkjet head while conveying a sheet in a conveying direction along a printing route to perform printing on the sheet; and a downstream side conveyor arranged downstream of the printing unit in the conveying direction and including a guide defining a downstream conveyance route being a space for the sheet to be conveyed. The downstream side conveyor is configured to convey the sheet along the downstream conveyance route. The downstream side conveyor includes an adjustment member narrowing a flow passage of air in the downstream conveyance route. The guide includes communication holes communicating the downstream conveyance route with a space outside the printing route and outside the downstream conveyance route.Type: GrantFiled: September 20, 2016Date of Patent: November 14, 2017Assignee: RISO KAGAKU CORPORATIONInventor: Toshihide Maesaka
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Publication number: 20170087881Abstract: An inkjet printer includes: a printing unit including an inkjet head and configured to eject an ink from the inkjet head while conveying a sheet in a conveying direction along a printing route to perform printing on the sheet; and a downstream side conveyor arranged downstream of the printing unit in the conveying direction and including a guide defining a downstream conveyance route being a space for the sheet to be conveyed. The downstream side conveyor is configured to convey the sheet along the downstream conveyance route. The downstream side conveyor includes an adjustment member narrowing a flow passage of air in the downstream conveyance route. The guide includes communication holes communicating the downstream conveyance route with a space outside the printing route and outside the downstream conveyance route.Type: ApplicationFiled: September 20, 2016Publication date: March 30, 2017Inventor: Toshihide MAESAKA
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Patent number: 9004634Abstract: An inkjet printer includes nozzle rows aligned along a printing direction along which printing on a print medium is executed, and a controller configured to control ejection of the ink droplets from the nozzle rows. The nozzle rows include a pair of an upstream nozzle row and a downstream nozzle row. The upstream nozzle row is positioned just upstream from the downstream nozzle row along the printing direction. The controller controls ejection of the ink droplets from the upstream nozzle row and the downstream nozzle row so that propulsive forces applied to ink droplets ejected from the downstream nozzle row are made larger, based on image data associated with the upstream nozzle row, than propulsive forces applied to ink droplets ejected from the upstream nozzle row. The inkjet printer can restrict degradation of print quality by landing the ink droplets ejected from the downstream nozzle at their target positions.Type: GrantFiled: March 14, 2013Date of Patent: April 14, 2015Assignee: Riso Kagaku CorporationInventors: Toshihide Maesaka, Mamoru Saitou, Takashi Ebisawa, Ryo Terakado
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Patent number: 8926046Abstract: An image forming apparatus includes at least one inkjet head which is disposed above a feed path of a print medium and on which plural nozzles are aligned along a primary sweeping direction perpendicular to a feed direction of the print medium fed along the feed path. The image forming apparatus forms images by ejecting ink droplets from the nozzles. The image forming apparatus includes a controller that is operable to compensate ejection timings of ink droplets to be ejected from the nozzles onto the print medium based on ejection density of the ink droplets. The image forming apparatus can form good images that are not affected by ink dot displacements caused by feed airflow even when the ink dot displacements are affected by self-induced airflow.Type: GrantFiled: September 12, 2013Date of Patent: January 6, 2015Assignee: Riso Kagaku CorporationInventors: Mamoru Saitou, Takashi Ebisawa, Ryo Terakado, Toshihide Maesaka
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Patent number: 8814307Abstract: An image forming apparatus includes a controller configured to adjust ink ejection amounts from nozzles in a downstream nozzle array on a basis of a bypassing air flow degree. The bypassing air flow degree is calculated based on an ejection density of ink ejected from nozzles in an upstream nozzle array on a recording medium and indicates a generation degree of a bypassing air flow generated when a transfer air flow generated by transfer of the recording medium bypasses a self-generated air flow generated by ink ejected from the nozzles in the upstream nozzle array. The downstream nozzle array is a nozzle array located downstream in a transfer direction among a plurality of nozzle arrays. The upstream nozzle array is a nozzle array located upstream in the transfer direction among the plurality of nozzle arrays.Type: GrantFiled: September 18, 2013Date of Patent: August 26, 2014Assignee: Riso Kagaku CorporationInventors: Takashi Ebisawa, Ryo Terakado, Mamoru Saitou, Toshihide Maesaka
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Publication number: 20140085371Abstract: An image forming apparatus includes a controller configured to adjust ink ejection amounts from nozzles in a downstream nozzle array on a basis of a bypassing air flow degree. The bypassing air flow degree is calculated based on an ejection density of ink ejected from nozzles in an upstream nozzle array on a recording medium and indicates a generation degree of a bypassing air flow generated when a transfer air flow generated by transfer of the recording medium bypasses a self-generated air flow generated by ink ejected from the nozzles in the upstream nozzle array. The downstream nozzle array is a nozzle array located downstream in a transfer direction among a plurality of nozzle arrays. The upstream nozzle array is a nozzle array located upstream in the transfer direction among the plurality of nozzle arrays.Type: ApplicationFiled: September 18, 2013Publication date: March 27, 2014Applicant: RISO KAGAKU CORPORATIONInventors: Takashi EBISAWA, Ryo TERAKADO, Mamoru SAITOU, Toshihide MAESAKA
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Publication number: 20140078204Abstract: An image forming apparatus includes at least one inkjet head which is disposed above a feed path of a print medium and on which plural nozzles are aligned along a primary sweeping direction perpendicular to a feed direction of the print medium fed along the feed path. The image forming apparatus forms images by ejecting ink droplets from the nozzles. The image forming apparatus includes a controller that is operable to compensate ejection timings of ink droplets to be ejected from the nozzles onto the print medium based on ejection density of the ink droplets. The image forming apparatus can form good images that are not affected by ink dot displacements caused by feed airflow even when the ink dot displacements are affected by self-induced airflow.Type: ApplicationFiled: September 12, 2013Publication date: March 20, 2014Applicant: RISO KAGAKU CORPORATIONInventors: Mamoru SAITOU, Takashi EBISAWA, Ryo TERAKADO, Toshihide MAESAKA
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Publication number: 20130249986Abstract: An inkjet printer includes nozzle rows aligned along a printing direction along which printing on a print medium is executed, and a controller configured to control ejection of the ink droplets from the nozzle rows. The nozzle rows include a pair of an upstream nozzle row and a downstream nozzle row. The upstream nozzle row is positioned just upstream from the downstream nozzle row along the printing direction. The controller controls ejection of the ink droplets from the upstream nozzle row and the downstream nozzle row so that propulsive forces applied to ink droplets ejected from the downstream nozzle row are made larger, based on image data associated with the upstream nozzle row, than propulsive forces applied to ink droplets ejected from the upstream nozzle row. The inkjet printer can restrict degradation of print quality by landing the ink droplets ejected from the downstream nozzle at their target positions.Type: ApplicationFiled: March 14, 2013Publication date: September 26, 2013Applicant: RISO KAGAKU CORPORATIONInventors: Toshihide MAESAKA, Mamoru Saitou, Takashi Ebisawa, Ryo Terakado