Patents by Inventor Yoshikane Matsumoto

Yoshikane Matsumoto 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).

  • Patent number: 9375958
    Abstract: An image forming apparatus includes a sheet feed conveying unit having an outlet for a recording medium on one side; at least one image forming unit having an inlet for the recording medium on one side and an outlet for the recording medium on the other side; and a sheet eject conveying unit having an inlet for the recording medium on one side, wherein the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are arranged along a conveying direction of the recording medium; the outlet of the sheet feed conveying unit matches the inlet of the image forming unit; the outlet of the image forming unit matches the inlet of the sheet eject conveying unit; and the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are connected to each other in a separable manner.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: June 28, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yuuji Ohmura, Yasushi Hashimoto, Yoshikane Matsumoto
  • Patent number: 9259947
    Abstract: An image forming apparatus includes a sheet feed conveying unit having an outlet for a recording medium on one side; at least one image forming unit having an inlet for the recording medium on one side and an outlet for the recording medium on the other side; and a sheet eject conveying unit having an inlet for the recording medium on one side, wherein the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are arranged along a conveying direction of the recording medium; the outlet of the sheet feed conveying unit matches the inlet of the image forming unit; the outlet of the image forming unit matches the inlet of the sheet eject conveying unit; and the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are connected to each other in a separable manner.
    Type: Grant
    Filed: October 20, 2009
    Date of Patent: February 16, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yuuji Ohmura, Yasushi Hashimoto, Yoshikane Matsumoto
  • Publication number: 20140375741
    Abstract: An image forming apparatus includes a sheet feed conveying unit having an outlet for a recording medium on one side; at least one image forming unit having an inlet for the recording medium on one side and an outlet for the recording medium on the other side; and a sheet eject conveying unit having an inlet for the recording medium on one side, wherein the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are arranged along a conveying direction of the recording medium; the outlet of the sheet feed conveying unit matches the inlet of the image forming unit; the outlet of the image forming unit matches the inlet of the sheet eject conveying unit; and the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are connected to each other in a separable manner.
    Type: Application
    Filed: September 12, 2014
    Publication date: December 25, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Yuuji OHMURA, Yasushi HASHIMOTO, Yoshikane MATSUMOTO
  • Patent number: 8870328
    Abstract: An image forming apparatus includes a sheet feed conveying unit having an outlet for a recording medium on one side; at least one image forming unit having an inlet for the recording medium on one side and an outlet for the recording medium on the other side; and a sheet eject conveying unit having an inlet for the recording medium on one side, wherein the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are arranged along a conveying direction of the recording medium; the outlet of the sheet feed conveying unit matches the inlet of the image forming unit; the outlet of the image forming unit matches the inlet of the sheet eject conveying unit; and the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are connected to each other in a separable manner.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 28, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuuji Ohmura, Yasushi Hashimoto, Yoshikane Matsumoto
  • Publication number: 20130201267
    Abstract: An image forming apparatus includes a sheet feed conveying unit having an outlet for a recording medium on one side; at least one image forming unit having an inlet for the recording medium on one side and an outlet for the recording medium on the other side; and a sheet eject conveying unit having an inlet for the recording medium on one side, wherein the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are arranged along a conveying direction of the recording medium; the outlet of the sheet feed conveying unit matches the inlet of the image forming unit; the outlet of the image forming unit matches the inlet of the sheet eject conveying unit; and the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are connected to each other in a separable manner.
    Type: Application
    Filed: March 15, 2013
    Publication date: August 8, 2013
    Applicant: RICOH COMPANY, LTD.
    Inventors: Yuuji OHMURA, Yasushi HASHIMOTO, Yoshikane MATSUMOTO
  • Publication number: 20100110134
    Abstract: An image forming apparatus includes a sheet feed conveying unit having an outlet for a recording medium on one side; at least one image forming unit having an inlet for the recording medium on one side and an outlet for the recording medium on the other side; and a sheet eject conveying unit having an inlet for the recording medium on one side, wherein the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are arranged along a conveying direction of the recording medium; the outlet of the sheet feed conveying unit matches the inlet of the image forming unit; the outlet of the image forming unit matches the inlet of the sheet eject conveying unit; and the sheet feed conveying unit, the image forming unit, and the sheet eject conveying unit are connected to each other in a separable manner.
    Type: Application
    Filed: October 20, 2009
    Publication date: May 6, 2010
    Applicant: RICOH COMPANY, LTD.
    Inventors: Yuuji OHMURA, Yasushi HASHIMOTO, Yoshikane MATSUMOTO
  • Patent number: 7413294
    Abstract: An inkjet head includes a common ink puddle section, a nozzle plate having a plurality of nozzle orifices, an ink flow channel substrate having grooves communicating from the common ink puddle section to the nozzle orifices, and being formed alternatively in front and back surfaces of the ink flow channel substrate, to end sections of the grooves the nozzle plate being fixed, a chamber plate being stacked on the ink flow channel substrate, and having pressure generation chambers corresponding to the nozzle orifices, a diaphragm stacking on the chamber plate opposite from the ink flow channel substrate, a pressure generator provided on the diaphragm for the respective pressure generation chambers to generate a change in an internal pressure. Preferably, a volumetric capacity of the pressure generation chambers is changed in accordance with a change in the pressure, to eject an ink droplet from the nozzle orifice.
    Type: Grant
    Filed: March 1, 2004
    Date of Patent: August 19, 2008
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Satoru Tobita, Yoshitaka Akiyama, Toshiharu Sumiya, Yoshikane Matsumoto
  • Patent number: 7131718
    Abstract: A housing of inkjet head has a projection that is formed with a plurality of opening grooves defined between adjacent two of projecting parts, and tip ends of the projecting parts are fixed to a diaphragm plate. Piezoelectric elements are inserted in respective opening grooves and fixed to a diaphragm of the diaphragm plate at positions opposite respective pressure chambers.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: November 7, 2006
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Ryouta Matsufuji, Satoru Tobita, Yoshitaka Akiyama, Toshiharu Sumiya, Yoshikane Matsumoto
  • Publication number: 20060187274
    Abstract: A chamber support plate of an inkjet head is formed as a member different from a housing. The chamber support plate is formed with a plurality of grooves at high density by a dicing saw or the like. Piezoelectric elements are inserted into the grooves and adhered to a chamber plate. The plurality of grooves define comb teeth portions, which support the chamber plate at positions between adjacent piezoelectric elements.
    Type: Application
    Filed: March 16, 2006
    Publication date: August 24, 2006
    Inventors: Osamu Machida, Tomohiko Koda, Satoru Tobita, Yoshitaka Akiyama, Toshiharu Sumiya, Yoshikane Matsumoto
  • Patent number: 7090340
    Abstract: An inkjet recording head includes: a nozzle plate having nozzles arranged in a row; a plurality of pressure generating chambers communicating to the nozzles, the plurality of pressure generating chambers including a first pressure generating chamber and a second pressure generating chamber; a diaphragm formed on one face of the pressure generating chamber; a common ink chamber for supplying the ink to the plurality of pressure generating chambers; and a piezoelectric element for displacing the diaphragm. The first pressure generating chamber is disposed on one side of the nozzles and a second pressure generating chamber is disposed on the other side. The first and second pressure generating chambers are opposed to each other across the nozzles so that the central lines of the first and second pressure generating chambers are almost coincident.
    Type: Grant
    Filed: December 3, 2003
    Date of Patent: August 15, 2006
    Assignee: Hitachi Printing Solutions, Ltd.
    Inventors: Satoru Tobita, Yoshitaka Akiyama, Toshiharu Sumiya, Yoshikane Matsumoto
  • Patent number: 7077511
    Abstract: A chamber support plate of an inkjet head is formed as a member different from a housing. The chamber support plate is formed with a plurality of grooves at high density by a dicing saw or the like. Piezoelectric elements are inserted into the grooves and adhered to a chamber plate. The plurality of grooves define comb teeth portions, which support the chamber plate at positions between adjacent piezoelectric elements.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: July 18, 2006
    Assignee: Ricoh Printing Systems Ltd.
    Inventors: Osamu Machida, Tomohiko Koda, Satoru Tobita, Yoshitaka Akiyama, Toshiharu Sumiya, Yoshikane Matsumoto
  • Patent number: 6837574
    Abstract: A recording head 200 has a plurality of nozzle orifices aligned in a row extending in a first direction. The recording head 200 is arranged with the nozzle orifices in confrontation with a recording medium P. The recording medium P is moved in a second direction B with respect to the recording head 200. Also, ink droplets ejected from the nozzle orifices are charged to a charged amount that corresponds to deflection amount of the ink droplets. The charged ink droplets are deflected in a direction perpendicular to a main scanning line. The plurality of ink droplets ejected from the plurality of nozzle orifices impinge on the same pixel position or at a nearby position so that it is possible to impinge multiple droplets at the same pixel position or a nearby position. As a result, it is possible to back up broken nozzles and to reduce recording distortion.
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: January 4, 2005
    Assignee: Hitachi Printing Solutions, Ltd.
    Inventors: Takahiro Yamada, Shinya Kobayashi, Hitoshi Kida, Kunio Satou, Toshitaka Ogawa, Yoshikane Matsumoto, Katsunori Kawasumi, Kazuo Shimizu
  • Publication number: 20040263579
    Abstract: A housing of inkjet head has a projection that is formed with a plurality of opening grooves defined between adjacent two of projecting parts, and tip ends of the projecting parts are fixed to a diaphragm plate. Piezoelectric elements are inserted in respective opening grooves and fixed to a diaphragm of the diaphragm plate at positions opposite respective pressure chambers.
    Type: Application
    Filed: June 16, 2004
    Publication date: December 30, 2004
    Inventors: Ryouta Matsufuji, Satoru Tobita, Yoshitaka Akiyama, Toshiharu Sumiya, Yoshikane Matsumoto
  • Publication number: 20040169704
    Abstract: An inkjet head includes a common ink puddle section, a nozzle plate having a plurality of nozzle orifices, an ink flow channel substrate having grooves communicating from the common ink puddle section to the nozzle orifices, and being formed alternatively in front and back surfaces of the ink flow channel substrate, to end sections of the grooves the nozzle plate being fixed, a chamber plate being stacked on the ink flow channel substrate, and having pressure generation chambers corresponding to the nozzle orifices, a diaphragm stacking on the chamber plate opposite from the ink flow channel substrate, a pressure generator provided on the diaphragm for the respective pressure generation chambers to generate a change in an internal pressure. Preferably, a volumetric capacity of the pressure generation chambers is changed in accordance with a change in the pressure, to eject an ink droplet from the nozzle orifice.
    Type: Application
    Filed: March 1, 2004
    Publication date: September 2, 2004
    Applicant: Hitachi Printing Solutions, Ltd.
    Inventors: Satoru Tobita, Yoshitaka Akiyama, Toshiharu Sumiya, Yoshikane Matsumoto
  • Publication number: 20040109047
    Abstract: An inkjet recording head includes: a nozzle plate having nozzles arranged in a row; a plurality of pressure generating chambers communicating to the nozzles, the plurality of pressure generating chambers including a first pressure generating chamber and a second pressure generating chamber; a diaphragm formed on one face of the pressure generating chamber; a common ink chamber for supplying the ink to the plurality of pressure generating chambers; and a piezoelectric element for displacing the diaphragm. The first pressure generating chamber is disposed on one side of the nozzles and a second pressure generating chamber is disposed on the other side. The first and second pressure generating chambers are opposed to each other across the nozzles so that the central lines of the first and second pressure generating chambers are almost coincident.
    Type: Application
    Filed: December 3, 2003
    Publication date: June 10, 2004
    Applicant: Hitachi Printing Solutions, Ltd.
    Inventors: Satoru Tobita, Yoshitaka Akiyama, Toshiharu Sumiya, Yoshikane Matsumoto
  • Publication number: 20040066431
    Abstract: A chamber support plate of an inkjet head is formed as a member different from a housing. The chamber support plate is formed with a plurality of grooves at high density by a dicing saw or the like. Piezoelectric elements are inserted into the grooves and adhered to a chamber plate. The plurality of grooves define comb teeth portions, which support the chamber plate at positions between adjacent piezoelectric elements.
    Type: Application
    Filed: August 26, 2003
    Publication date: April 8, 2004
    Inventors: Osamu Machida, Tomohiko Koda, Satoru Tobita, Yoshitaka Akiyama, Toshiharu Sumiya, Yoshikane Matsumoto
  • Patent number: 6618159
    Abstract: When print mode of a printing device is switched to a print mode with a higher print speed, after the direction of shuttle movement is reversed, a time duration that driving current is applied to a reversing coil is increased, so that shuttle speed is increased to a target speed. A time duration that driving current is applied to a constant velocity coil is decreased accordingly. On the other hand, when the print mode is switched to a print mode with a lower print speed, the time duration that driving current is applied to the reversing coil is decreased, and the time duration that driving current is applied to the constant velocity coil is increased accordingly. In this way, the print modes of the printing device can be switched quickly without stopping printing operations, thereby enhancing throughput.
    Type: Grant
    Filed: October 1, 1999
    Date of Patent: September 9, 2003
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Satoru Tobita, Yoshikane Matsumoto, Hideaki Mamiya
  • Patent number: 6561629
    Abstract: A back electrode 30 is provided at a rear surface side of a recording sheet 60. An orifice electrode 11 is attached to an orifice plate 15 of a head module 10. The orifice electrode 11, the orifice plate 15, and ink filling in a nozzle element 2 are electrically connected to the ground. The back electrode 30 has the potential corresponding to that of a charging/deflecting signal. With this configuration, the orifice electrode 11, a pressure chamber 13, and the back electrode 30 together generates an inclined electric field 85 at a position a close to a center trajectory 90. A charged ink droplet is deflected greatly by the inclined electric field 85, at an early stage of the ink flight, and even greater deflection can be achieved as the flight proceeds.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: May 13, 2003
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Takahiro Yamada, Kunio Satou, Shinya Kobayashi, Hitoshi Kida, Kazuo Shimizu, Toshitaka Ogawa, Yoshikane Matsumoto, Lee Chahn
  • Publication number: 20030058289
    Abstract: A recording head 200 has a plurality of nozzle orifices aligned in a row extending in a first direction. The recording head 200 is arranged with the nozzle orifices in confrontation with a recording medium P. The recording medium P is moved in a second direction B with respect to the recording head 200. Also, ink droplets ejected from the nozzle orifices are charged to a charged amount that corresponds to deflection amount of the ink droplets. The charged ink droplets are deflected in a direction perpendicular to a main scanning line. The plurality of ink droplets ejected from the plurality of nozzle orifices impinge on the same pixel position or at a nearby position so that it is possible to impinge multiple droplets at the same pixel position or a nearby position. As a result, it is possible to back up broken nozzles and to reduce recording distortion.
    Type: Application
    Filed: September 5, 2002
    Publication date: March 27, 2003
    Inventors: Takahiro Yamada, Shinya Kobayashi, Hitoshi Kida, Kunio Satou, Toshitaka Ogawa, Yoshikane Matsumoto, Katsunori Kawasumi, Kazuo Shimizu
  • Publication number: 20020130926
    Abstract: A back electrode 30 is provided at a rear surface side of a recording sheet 60. An orifice electrode 11 is attached to an orifice plate 15 of a head module 10. The orifice electrode 11, the orifice plate 15, and ink filling in a nozzle element 2 are electrically connected to the ground. The back electrode 30 has the potential corresponding to that of a charging/deflecting signal. With this configuration, the orifice electrode 11, a pressure chamber 13, and the back electrode 30 together generates an inclined electric field 85 at a position &agr; close to a center trajectory 90. A charged ink droplet is deflected greatly by the inclined electric field 85, at an early stage of the ink flight, and even greater deflection can be achieved as the flight proceeds.
    Type: Application
    Filed: March 13, 2002
    Publication date: September 19, 2002
    Inventors: Takahiro Yamada, Kunio Satou, Shinya Kobayashi, Hitoshi Kida, Kazuo Shimizu, Toshitaka Ogawa, Yoshikane Matsumoto, Lee Chahn