Loading Patents (Class 399/281)
  • Patent number: 10761451
    Abstract: A developing apparatus, includes: a developer bearing member that is rotatable; an moving member configured to move the magnetic developer carried on the developer bearing member before the magnetic developer is restricted by a restricting member, the moving member being rotatable and brought into contact with a surface of the developer bearing member; and a control portion, wherein, at a contact position between the developer bearing member and the moving member, assuming that a moving speed vector of a surface of the developer bearing member is taken as R and a moving speed vector of a surface of the moving member is taken as r, the control portion controls rotational operation of the developer bearing member and the moving member such that a direction of a vector R?r during image formation and a direction of a vector R?r during non-image formation be opposite to each other.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: September 1, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masahito Kato, Hirokazu Fujino, Naoki Fukushima, Atsushi Toda, Daisuke Baba, Yosuke Kishi, Masaki Hirose
  • Patent number: 10739698
    Abstract: A developing cartridge includes: a casing, a developing roller, a first agitator, a supply roller, and a second agitator. The casing is configured to accommodate toner. The developing roller is rotatable about a developing roller rotation axis extending in a first direction. The first agitator is configured to agitate the toner. The first agitator is rotatable about a first agitator rotation axis extending in the first direction. The supply roller is positioned between the first agitator and the developing roller. The supply roller is rotatable about a supply roller rotation axis extending in the first direction. The second agitator is positioned between the supply roller and the first agitator. The second agitator is rotatable about a second agitator rotation axis extending in the first direction. A rotation locus of the second agitator is positioned outside of a rotation locus of the first agitator.
    Type: Grant
    Filed: July 1, 2019
    Date of Patent: August 11, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Kazuaki Ooka, Junichi Hashimoto, Shota Iriyama, Keigo Nakajima, Kengo Yada
  • Patent number: 10719028
    Abstract: A process cartridge includes a developer carrier including a dielectric portion and a conductive portion on a surface thereof, a regulation member, and an image carrier disposed so as to come into contact with the developer carrier. The developer carrier and the image carrier are rotationally driven such that a surface of the developer carrier and a surface of the image carrier move at linear velocities different from each other at a contact portion, and the developer remaining on the image carrier after the developer image is transferred from the image carrier, is collected by the developer carrier at the contact portion.
    Type: Grant
    Filed: August 7, 2019
    Date of Patent: July 21, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji An, Kazunari Hagiwara, Takuya Kitamura, Takashi Hiramatsu, Jun Miura
  • Patent number: 10712685
    Abstract: There are provided a developing roller having no risks of the image density of formed images rapidly decreasing and the occurrence of an uneven density since a toner transportation amount does not decrease greatly even if image formation is repeated, and a method of producing the same. In a developing roller, a plurality of recesses are disposed on an outer circumferential surface of a roller main body so that a ratio PA/PC of a pitch PA in an axial direction on the outer circumferential surface to a pitch PC in a circumferential direction is set to a range exceeding 1.1. The production method includes a process of forming the recesses on the outer circumferential surface by laser processing.
    Type: Grant
    Filed: April 29, 2019
    Date of Patent: July 14, 2020
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Yuta Imase
  • Patent number: 10691063
    Abstract: A process cartridge includes a photosensitive drum; a developing roller; a developer supplying roller, provided in contact with the developing roller; a driving force receiving portion provided at a shaft end of the supplying roller; a first driving force transmitting portion; a second driving force transmitting portion; flexible sheets provided adjacent to an engaging portion between the first portion and the second portion to intermittently contact the second portion with rotation of the second portion, wherein a rotational direction of the roller is opposite to that of the roller, and a peripheral speed of the roller is larger than that of the roller.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: June 23, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Maeshima, Kuniaki Hirukawa, Shuichi Gofuku, Yoshihiro Mitsui
  • Patent number: 10663910
    Abstract: A developing cartridge includes: a housing; a developing roller rotatable about a first axis extending in an axial direction; a first helical gear and a second helical gear positioned at an outer surface of the housing; and an engaging member movable together with the second helical gear. The second helical gear meshes with the first helical gear and is rotatable in a first rotational direction and a second rotational direction. The second helical gear is movable in the axial direction between a first position and a second position closer to the outer surface than the first position. The second helical gear rotates in the first rotational direction to move toward the first position. The second helical gear rotates in the second rotational direction to move toward the second position whereby the engaging member engages a part of the outer surface to terminate rotation of the second helical gear.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: May 26, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Keita Shimizu
  • Patent number: 10642199
    Abstract: An image forming apparatus fixes a toner image on a transfer material at a fixing portion by applying an AC voltage from an AC power source to a fixing unit and includes a conductive pre-transfer guide on a position at which the transfer material nipped by a transfer portion and the fixing portion is in contact therewith. A capacitor and a Zener diode which is connected to the capacitor in parallel and maintains the pre-transfer guide at a predetermined voltage in a state in which a toner image is transferred to the transfer material nipped by the fixing portion and the transfer portion are arranged between the pre-transfer guide and the ground.
    Type: Grant
    Filed: October 30, 2018
    Date of Patent: May 5, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kensuke Umeda, Shinsuke Kobayashi, Ai Suzuki
  • Patent number: 10620563
    Abstract: A developer container includes a developer bearing member for bearing developer, a conveying member which conveys the developer, and a frame. In the frame, a partition partitions a developer storage chamber and a developing chamber and includes a first opening which connects the developer storage chamber with the developing chamber, and a second opening which connects an interior of the developing chamber and an exterior of the frame. A sealing member suppresses leakage of the developer from between the frame and the developer bearing member, and a filter allows passage of air through the second opening and restricts passage of the developer through the second opening. The conveying member is deformable such that the developer is conveyed from the developer storage chamber to the developing chamber via the first opening by deformation of the conveying member being released.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: April 14, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shota Nakamura, Yuuki Nakamura
  • Patent number: 10551765
    Abstract: Provided is an image forming apparatus including an image bearing member, a charging member, an exposing member, a developer carrying member, a storage member to store a first lifetime threshold for the first image forming mode, a second lifetime threshold for the second image forming mode and a value related to a driving amount of the image bearing member. The image forming apparatus further includes a controller to (i) perform a first determination regarding the lifetime corresponding to the first mode based on the value related to the driving amount and the first lifetime threshold and (ii) perform a second determination regarding the lifetime corresponding to the second mode based on the value related to the driving amount and the second lifetime threshold, and a notifying unit to perform a notification based on a result of the first or second determination to the image bearing member.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: February 4, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuichiro Hirata, Shinichi Hagiwara
  • Patent number: 10545430
    Abstract: An image forming unit of an image forming apparatus includes a developing device and a toner replenishing unit that replenishes the developing device with toner. The toner replenishing unit includes an upper toner container, a lower toner container, a toner conveyance unit, and a replenishment control unit. The upper toner container and the lower toner container are disposed in a staggered manner in an apparatus body. When the upper toner container becomes empty, the replenishment control unit controls the toner replenishing unit so as to replenish the developing device with the toner from the lower toner container.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: January 28, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Yuta Nohara, Tomohiko Yamakawa, Hiroaki Ohashi, Masaru Takagi
  • Patent number: 10459372
    Abstract: A binary ink developer (BID) assembly for a liquid electrophotography (LEP) printing device can include a developer roller having an electrically insulating exterior coating that receives ink from an ink supply and transfers the received ink to a photoconductive imaging cylinder in accordance with an electrostatic image on the imaging cylinder. A charge-specified boundary condition can exist at the boundary between the exterior coating and the ink. Electrically conductive ink may not be transferred to the imaging cylinder at background portions of the electrostatic image.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: October 29, 2019
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Seongsik Chang
  • Patent number: 10191447
    Abstract: An image forming apparatus includes a development part, a temperature detection part that detects an apparatus inner temperature, and a control part that corrects a potential difference (?V) between the development voltage and the supply voltage based on a temperature difference (?T). The potential difference is an absolute value determined by follow: ?V=|(the development voltage)?(the supply voltage).| the temperature difference is determined by follow: ?T=(the apparatus inner temperature)?(a glass transition starting temperature). The glass transition starting temperature is determined in consideration of a differential scanning calorimetry (DSC) curve of the toner.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: January 29, 2019
    Assignee: Oki Data Corporation
    Inventor: Susumu Yamamoto
  • Patent number: 10191410
    Abstract: A developing device for use with an image forming apparatus includes a developer carrying member carrying a developer for developing a latent image, a supplying member for supplying the developer to the developer carrying member and forming a nip in contact with the developer carrying member, and an accommodating portion, provided below the supplying member in a state the developing device is mounted on the image forming apparatus for use, for accommodating the developer to be supplied from the supplying member to the developer carrying member. In addition, a feeding member, provided in the accommodating portion, feeds the developer accommodated in the accommodating portion to the supplying member, and a rotatable member, provided above the feeding member and located at a downstream side of the nip with respect to a rotational direction of the supplying member, moves the developer toward the nip.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: January 29, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shuhei Kawasaki, Hisashi Taniguchi
  • Patent number: 9639023
    Abstract: A sliding member has a free end that extends toward the downstream side of the direction of rotation of a developer bearing member, and a tip portion on the free end side of the sliding member slides against the developer bearing member. The developer bearing member has a region where, when a developer is placed on a vertical direction upper side of the developer bearing member which is in a stationary state, the developer can remain without dropping. A position against which the tip portion of the sliding member slides, the region, and a position against which a regulating member slides are located on the developer bearing member in this order toward the downstream side of the direction of rotation of the developer bearing member.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: May 2, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Shun Sato
  • Patent number: 9568855
    Abstract: A developing device including a containing unit configured to be arranged below a supply member and contain a developer and a developer bearing member configured to bear the developer and develop an electrostatic latent image, further includes a supply member which is configured to supply the developer to the developer bearing member, to be arranged to form a nip portion between the supply member and the developer bearing member, and to rotate in a direction in which its surface moves from an upper end to a lower end of the nip portion, and a conveyance member which is configured to convey the developer contained in the containing unit onto the supply member.
    Type: Grant
    Filed: April 23, 2013
    Date of Patent: February 14, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kodai Hayashi, Yoshihiro Mitsui, Nobuyoshi Yoshida, Hisashi Taniguchi
  • Patent number: 9494916
    Abstract: A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The cartridge includes an electrophotographic photosensitive drum, a developing roller, a drum unit containing the drum, a developing unit containing the roller and being movable so the roller contacts and is spaced from the drum, and a first force receiver receiving a force from a main-assembly first force applier by movement of a door from open to closed positions when mounting the cartridge and a second force receiver movable from a stand-by position by movement of the first force receiver by a force received from the first force applier. The second force receiver takes a projected position receiving a force from the second force applier to move the developing unit so the roller moves out of contact with the drum, the projected position being higher than the stand-by position.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: November 15, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akira Yoshimura, Kazunari Murayama, Susumu Nittani, Atsushi Numagami
  • Patent number: 9465353
    Abstract: A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus. The cartridge includes an electrophotographic photosensitive drum, a developing roller, a drum unit containing the drum, a developing unit containing the roller and being movable so the roller contacts and is spaced from the drum, and a first force receiver receiving a force from a main-assembly first force applier by movement of a door from open to closed positions when mounting the cartridge and a second force receiver movable from a stand-by position by movement of the first force receiver by a force received from the first force applier. The second force receiver takes a projected position receiving a force from the second force applier to move the developing unit so the roller moves out of contact with the drum, the projected position being higher than the stand-by position.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: October 11, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akira Yoshimura, Kazunari Murayama, Susumu Nittani, Atsushi Numagami
  • Patent number: 9448509
    Abstract: A developing device and image forming apparatus are provided. The developing device includes a chassis; a developer carrying member; a thickness regulating member; a supply member; and a conveying member. In a state in which the developing device is attached to a main body an opening of the chassis faces upward; the thickness regulating member pressure-contacts the developer carrying member from below the developer carrying member; the conveying member is disposed below the developer carrying member; the supply member overlaps a portion of the conveying member in a horizontal direction; and a portion of the conveying member is disposed within a vertical projection plane between a pressure-contact position of the thickness regulating member to the developer carrying member, and a contact position of the supply member to the developer carrying member. The image forming apparatus includes a main body; a plurality of photosensitive members; and a plurality of developing devices.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: September 20, 2016
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Shougo Sato
  • Patent number: 9442451
    Abstract: Provided is an electroconductive member for electrophotography which is suppressed in adhesion of a contaminant to a surface thereof. The electroconductive member for electrophotography includes, in this order, an electroconductive support, an electroconductive elastic layer, and a surface layer. The surface layer contains a binder resin and electroconductive fine particles having a number average particle diameter of 5.0 nm or more and 50.0 nm or less. At least part of the electroconductive fine particles are exposed from the surface layer. The surface layer has, on a surface thereof, protruded portions derived from exposed portions of the electroconductive fine particles. The surface layer has a volume resistivity of 1.0×1010 ?cm or more and 1.0×1016 ?cm or less and a universal hardness at a depth of 1 ?m from the surface thereof of 1.0 N/mm2 or more and 7.0 N/mm2 or less.
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: September 13, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kazuhiro Yamauchi, Satoru Nishioka, Kenichi Yamauchi, Hiroki Masu, Noriko Suzumura
  • Patent number: 9329531
    Abstract: A developing device includes an applying portion for applying a bias at a first voltage value and a first frequency, to a toner bearing member during a development period in which toner particles are supplied to an image bearing member. A controller executes a removal control to remove attached matter adhering to a bearing surface of the toner bearing member during a non-development period. Upon executing the removal control, the controller first causes residual toner particles to separate from the bearing surface. Subsequently, the controller controls the applying portion to cause a second bias at a second voltage value higher than the first voltage value or at a second frequency higher than the first frequency to be applied to the toner bearing member while bringing a developer layer on a developer bearing member into contact with the bearing surface.
    Type: Grant
    Filed: July 19, 2011
    Date of Patent: May 3, 2016
    Assignee: KYOCERA MITA CORPORATION
    Inventor: Takefumi Yotsutsuji
  • Patent number: 9280133
    Abstract: In a development device in which a developer containing unit underlies a development chamber, a supplying member in the development chamber forms a nip portion with a developer carrier and the developer carrier and the supplying member rotate in the direction in which their respective surfaces move from an upper end to a lower end of the nip portion.
    Type: Grant
    Filed: April 23, 2013
    Date of Patent: March 8, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobuyoshi Yoshida, Yoshihiro Mitsui, Kodai Hayashi, Yuichiro Hirata, Shinya Yamamoto
  • Patent number: 9261812
    Abstract: A toner adder roll according to one example embodiment includes an electrically conductive shaft defining an axis of rotation of the toner adder roll. A foam member is cylindrically disposed about the shaft and forms an outer circumferential surface of the toner adder roll. The foam member is composed of a polymeric open-cell foam material. An abrasive agent is dispersed on the outer circumferential surface of the toner adder roll.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: February 16, 2016
    Assignee: Lexmark International, Inc.
    Inventors: Martin Victor DiGirolamo, Billie Jo Enciu, Kelly Ann Killeen, Kurt Daniel Lambert, Johnny Dale Massie, II, Robert Francis Soto, Donald Wayne Stafford
  • Patent number: 9207566
    Abstract: A development device includes: a developer carrier configured to develop an electrostatic latent image with a developer while rotating, the electrostatic latent image being carried on a surface of a rotating electrostatic latent image carrier; and first and second developer supply members configured to, while rotating, supply the developer carrier with the developer contained in a developer container. The first developer supply member and the second developer supply member are disposed at positions opposed to the developer carrier, and in contact with the developer carrier. The first developer supply member is disposed downstream of the second developer supply member in a rotational direction of the developer carrier. A first contact amount at which the first developer supply member is in contact with the developer carrier is set smaller than a second contact amount at which the second developer supply member is in contact with the developer carrier.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: December 8, 2015
    Assignee: Oki Data Corporation
    Inventor: Toshiharu Sato
  • Patent number: 9128458
    Abstract: A developing unit includes a toner storage portion containing toner and a toner supply member, and a development portion disposed above the toner storage portion. A partition wall divides the toner storage portion from the development portion. The partition wall includes a supply opening that defines a toner supply path from the toner storage portion to the development portion, and a discharge opening that defines a toner discharge path from the development portion to the toner storage portion.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: September 8, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Sung-min Park, Hyun-wook Bae, Jong-woo Lee
  • Patent number: 9063466
    Abstract: A developing device includes a transporting unit that rotates while facing an image carrier that carries an electrostatic latent image, the transporting unit transporting developer toward the image carrier; a feeding unit that contacts the transporting unit to feed the developer to the transporting unit; a transport path that connects a containing chamber that contains the developer to a feeding chamber that houses the feeding unit; a supplying unit that retains the developer to be supplied in the transport path and supplies the developer to the feeding unit in a supply region that is separated from a contact region in which the feeding unit contacts the transporting unit; and an attaching unit that is disposed downstream of the contact region and upstream of the supply region in a rotation direction of the feeding unit and that attaches the developer to the feeding unit at a location below the contact region.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: June 23, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Munenobu Okubo, Yasuyuki Tsutsumi, Shinji Mitsui, Kazuaki Iikura, Yosuke Ninomiya, Yoshifumi Ozaki, Akihiko Noda, Hirokazu Hamano, Takafumi Wakai, Masaru Sakuma
  • Patent number: 9046811
    Abstract: A developing device includes: a developing chamber provided with a developing agent-holding body; a first developing agent-accommodating chamber for accommodating a developing agent and arranged below the developing chamber; a first rotating member disposed in the first developing agent-accommodating chamber, elastically deformable and configured to rotate to slidably contact with an inner surface of the first developing agent-accommodating chamber; a second developing agent-accommodating chamber arranged adjacent to the developing chamber and an upper portion of the first developing agent-accommodating chamber, and to which the developing agent in the first developing agent-accommodating chamber is supplied by the first rotating member; and a second rotating member disposed in the second developing agent-accommodating chamber, elastically deformable and configured to rotate to slidably contact with an inner surface of the second developing agent-accommodating chamber and to transport the developing agent in
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: June 2, 2015
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Atsushi Kato
  • Patent number: 9046818
    Abstract: A development device includes a developer container that contains developer; a rotatable electrostatic latent image carrier that forms an electrostatic latent image thereon, being arranged below the developer container; a rotatable developer carrier that provides the developer to the electrostatic latent image carrier so that the electrostatic latent image is developed with the developer to form a developer image; and rotatable first and second developer supply members that supply the developer to the developer carrier. Wherein the first developer supply member and the second developer supply member are arranged next to each other and facing the developer carrier, and an outer diameter (D12) of a central portion of the first developer supply member in a rotation axis direction is smaller than outer diameters (D11, D13) of two end portions of the first developer supply member.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: June 2, 2015
    Assignee: Oki Data Corporation
    Inventor: Toshiharu Sato
  • Patent number: 9037050
    Abstract: A developer container for an image forming apparatus includes a housing configured to store developer, a developer conveying member disposed inside the housing and configured to rotate to convey the developer stored in the housing. The developer conveying member includes a rotary shaft, a rotary base member and a sheet-like main body. The main body has a base end portion fixed to the rotary base member and a free end portion configured to be pressed into contact with an inner wall of the housing. The rotary base member includes an urging member configured to urge the main body from an upstream side toward a downstream side in a direction of rotation thereof.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: May 19, 2015
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Shuichi Kato, Yohsuke Hata, Norio Uchida
  • Patent number: 9037052
    Abstract: A developer supply device configured to supply developer is provided. The developer supply device includes a rotatable developer carrying body configured to carry the developer, a casing configured to rotatably support the developer carrying body, and a restricting member configured to contact the developer carrying body to remove a part of the developer. The casing has a collecting side developer storage room configured to store the developer removed by the restricting member and a supplying side developer storage room configured to store the developer to be supplied to the brush layer. A supplying side developer storage level, which is a storage level of the developer in the supplying side developer storage room, is higher than a collecting side developer storage level, which is a storage level of the developer in the collecting side developer storage room.
    Type: Grant
    Filed: January 23, 2013
    Date of Patent: May 19, 2015
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Kazuna Taguchi, Keisuke Takahashi
  • Publication number: 20150132026
    Abstract: A developing device is provided. The developing device includes a developer carrier, a regulator, a first developer storing chamber, a plurality of conveyers disposed within the first developer storing chamber, a second developer storing chamber in communication with the first developer storing chamber, and a supply member disposed within the second developer storing chamber. The developer carrier carries developer on its surface and supplies developer to a latent image carrier carrying a latent image. The regulator regulates the thickness of developer on the surface of the developer carrier. The first developer storing chamber stores developer separated from the developer carrier by the regulator and is to be supplied with fresh developer. Each of the plurality of conveyers coveys developer in a different conveyance direction. The second developer storing chamber is to be supplied with developer from the first developer storing chamber. The supply member supplies developer to the developer carrier.
    Type: Application
    Filed: October 13, 2014
    Publication date: May 14, 2015
    Inventors: Tomofumi YOSHIDA, Takafumi MIYAZAKI, Yasuhide OHKUBO, Yuusuke FURUICHI, Rie MITANI
  • Patent number: 9020404
    Abstract: A developing unit includes a toner storage portion for containing toner and a development portion for containing the toner supplied from the toner storage portion. The development portion includes a developing roller for supplying the toner to a photosensitive body, a supply roller and an auxiliary supply roller. The supply roller and the auxiliary supply roller rotate while facing each other to supply the toner to the developing roller. In the developing unit, an inequality that |D?(R1+R2)|?1.0 mm is satisfied, where a distance between the centers of the auxiliary supply roller and the supply roller in a region where the auxiliary supply roller and the supply roller face each other is D, a radius of the supply roller is R1, and a radius of the auxiliary supply roller is R2.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: April 28, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-hong Kim, Joo-hwan Noh, Young-su Lee, Yun-kyu Sim
  • Publication number: 20150086248
    Abstract: A developing device includes a housing, a developing roller, a supply roller, a first regulating member, a second regulating member, a communication portion, and a conveying member. The second regulating member contacts with the supply roller. The housing has a first part and a second part. The first part is downstream of the second regulating member in a rotating direction of the supply roller, and a second part is upstream of the second regulating member in the rotating direction. The communication portion provides communication between the first part and the second part. The conveying member is in the first part and configured to convey the developing agent in the first part to the communication portion.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 26, 2015
    Applicant: Brother Kogyo Kabushiki Kaisha
    Inventors: Keisuke Takahashi, Kazutoshi Kotama
  • Patent number: 8989638
    Abstract: A developer carrying device includes a first developer containing part configured to contain developer, a first rotational member arranged in the first developer containing part, a second developer containing part arranged side by side with the first developer containing part, a second rotational member arranged in the second developer containing part, an opening part formed between the first developer containing part and the second developer containing part, and a restriction part arranged between the first rotational member and the second rotational member.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: March 24, 2015
    Assignee: Oki Data Corporation
    Inventor: Masayuki Suzuki
  • Patent number: 8983345
    Abstract: A developer supplying member is provided for supplying developer to a developer supporting member. The developer supplying member includes a foamed member having a discrete foam cell structure and being formed of a silicone rubber as a main component thereof. The foamed member constitutes a surface of the developer supplying member. The foamed member includes a foam cell wall dividing foam cells thereof and being exposed on the surface of the developer supplying member. The foam cell wall has a ten-point average surface roughness between 45.2 ?m and 65.3 ?m.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: March 17, 2015
    Assignee: OKI Data Corporation
    Inventor: Naoki Masui
  • Patent number: 8948664
    Abstract: A developing device of an image forming apparatus to convey a developing agent, the developing device including a housing having a developing agent accommodating compartment disposed therein, a first rotation member and a second rotation member that are disposed inside the developing agent accommodating compartment, a plurality of developing agent convey members that rotate around the first rotation member and the second rotation member being arranged along a shaft direction of the first rotation member, and at least one torque limiter coupled to between the first rotation member and at least one of the plurality of developing agent convey members, the at least one torque limiter to allow at least one of the plurality of developing agent convey members to perform a relative rotation with respect to the first rotation member when a load is applied to the plurality of developing agent convey members is varied.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: February 3, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae Hyun Shin, Seung Gweon Lee, Ki Hyun Yoo
  • Patent number: 8923736
    Abstract: A developing unit includes a toner storage portion containing toner and including a toner supply member, a development portion disposed above the toner storage portion and containing the toner supplied from the toner storage portion by the toner supply member, and including a developing roller and a supply roller to supply the toner to the developing roller, and a partition wall to divide the toner storage portion and the development portion, and including an opening portion disposed under the lowest portion of the supply roller and forming a path of the toner supplied from the toner storage portion to the development portion.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: December 30, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-hong Kim, Joo-hwan Noh, Young-su Lee, Yun-kyu Sim
  • Patent number: 8913929
    Abstract: A developing device for use with an image forming apparatus, includes a developing roller for carrying a developer and for forming a developer image on an image bearing member; a supplying roller for supplying the developer to the developing roller, wherein the supplying roller has a foam layer at its surface and forms a nip between itself and the developing roller; an accommodating portion, provided below the supplying roller, for accommodating the developer; and a feeding member for feeding the developer from the accommodating portion to a location above the nip by being rotated in a direction opposite to a rotational direction of the supplying roller. The supplying roller is rotated in a direction which is from a lower end of the nip to an upper end of the nip. The supplying roller is provided so that its top is higher than a top of the developing roller.
    Type: Grant
    Filed: July 19, 2012
    Date of Patent: December 16, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirokazu Fujino, Nobuyoshi Yoshida
  • Patent number: 8903270
    Abstract: A developing device including a developer bearing member containing a magnetic field generator having multiple magnetic poles and a developer containing chamber is provided. The developer containing chamber contains a two-component developer comprising magnetic carrier particles having a saturated magnetization of 58 to 70 emu/g in a magnetic field of 1KOe and toner particles, and has a divider to define an upper supply chamber and a lower collection chamber. The supply chamber includes a supply conveyer to supply the two-component developer to the developer bearing member at an upstream side from the developing area. The collection chamber includes a collection conveyer to collect the two-component developer from the developer bearing member at a downstream side from the developing area. The multiple magnetic poles includes three developer bearing poles capable of bearing the developer on its surface.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: December 2, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Koichi Sakata, Shigenori Yaguchi, Toyoshi Sawada, Hitoshi Iwatsuki, Hiroyuki Kishida
  • Publication number: 20140348555
    Abstract: A development device includes a developer container that contains developer; a rotatable electrostatic latent image carrier that forms an electrostatic latent image thereon, being arranged below the developer container; a rotatable developer carrier that provides the developer to the electrostatic latent image carrier so that the electrostatic latent image is developed with the developer to form a developer image; and rotatable first and second developer supply members that supply the developer to the developer carrier. Wherein the first developer supply member and the second developer supply member are arranged next to each other and facing the developer carrier, and an outer diameter (D12) of a central portion of the first developer supply member in a rotation axis direction is smaller than outer diameters (D11, D13) of two end portions of the first developer supply member.
    Type: Application
    Filed: May 23, 2014
    Publication date: November 27, 2014
    Applicant: Oki Data Corporation
    Inventor: Toshiharu SATO
  • Patent number: 8892011
    Abstract: A developing apparatus includes a housing, a developing roller, a supply roller, and a thickness regulating member. The housing is configured to accommodate developer that includes developer particles having a mean volume diameter. The developing roller is rotatably supported in the housing and has a peripheral surface configured to carry the developer. The supply roller is rotatably supported in the housing, contacts the developing roller, and configured to supply the toner to the developing roller. The thickness regulating member includes a contact member contacting the peripheral surface. The contact member is configured to regulate a thickness of the developer on the peripheral surface such that an average of the thickness of the developer on the peripheral surface becomes smaller than or equal to the mean volume diameter.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: November 18, 2014
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Shougo Sato, Xu Fan
  • Publication number: 20140334853
    Abstract: A developing device usable with an image forming apparatus includes a developer carrying member for carrying a developer; a developer accommodating portion for accommodating a developer; a guiding member having an inclined surface contacting the developer carrying member, the inclined surface being effective to guide a developer to a contact portion where the inclined surface contacts the developer carrying member to cause the developer to be carried on the developer carrying member; and a regulating member for regulating an amount of the developer carried on the developer carrying member, wherein an inclination angle of the inclined surface is in a range not less than an angle of rest and less than 90 degrees.
    Type: Application
    Filed: May 5, 2014
    Publication date: November 13, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Motoki Adachi, Takuya Kitamura, Hideo Kihara, Kouki Yano, Yuta Isobe
  • Publication number: 20140334854
    Abstract: A developing apparatus for developing operation on an image bearing member, includes a rotatable developer carrying member for carrying a developer; a rubbing member for rubbing the developer carrying member with the developer therebetween to cause the developer to be carried on the developer carrying member; wherein the rubbing member includes a free end portion extending toward a downstream with respect to a rotational moving direction of the developer carrying member, the free end portion rubs the developer carrying member, and wherein the rubbing member is provided with a reinforcing portion for reinforcing the free end portion.
    Type: Application
    Filed: May 9, 2014
    Publication date: November 13, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takuya Kitamura, Motoki Adachi, Hideo Kihara, Kouki Yano, Yuta Isobe
  • Patent number: 8879967
    Abstract: A development device includes a developer carrier configured to develop an electrostatic latent image by causing a developer to adhere to an electrostatic latent image carrier, a first supply member disposed in non-contact with the developer carrier and configured to supply a developer to the developer carrier, a second supply member disposed in contact with the first supply member below the first supply member and configured to supply the developer to the first supply member, and a developer holder configured to hold the developer for replenishing the second supply member. The first supply member and the second supply member rotate so that the surfaces thereof move in the same direction at their opposed parts.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: November 4, 2014
    Assignee: Oki Data Corporation
    Inventor: Kentaro Hasegawa
  • Publication number: 20140241760
    Abstract: A development device includes a developer carrier, a restriction member to control a layer thickness of the developer on the developer carrier, first and second developer supply members being in contact with the developer carrier. Each of the developer supply members is configured to rotate at a speed having a constant ratio to a rotation speed of the developer carrier. The second developer supply member and the restriction member are arranged in this order downstream of the first developer supply member in a rotating direction of the developer carrier. A peripheral speed (a speed of the outer peripheral surface) of the second developer supply member is set to be slower than that of the first developer supply member.
    Type: Application
    Filed: February 24, 2014
    Publication date: August 28, 2014
    Applicant: Oki Data Corporation
    Inventor: Tatsuhiko SHIMOMURA
  • Patent number: 8805221
    Abstract: An image forming apparatus includes photosensitive drums, electrostatic latent image forming units, developing sleeves, patch detection sensors which detect image densities of the toner images formed by the electrostatic latent image forming units, and toner replenishment units which replenish the developing sleeves with the toner based on the detection results of the patch detection sensors. Further, controllers are provided to control the rotation speeds of the developing sleeves at the time of forming the reference toner image to be higher than the rotation speeds of the developing sleeves at the time of forming a normal image.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: August 12, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Noriyuki Okada
  • Patent number: 8774686
    Abstract: A developing device is provided that facilitates developing agent delivery upward. A cartridge includes a developing roller, a supply roller, and a container disposed below the supply roller. The container can have an upper portion formed with an opening having upper and lower edges. A conveying member can be rotatably disposed and in rotational contact with an inner surface of the container for delivering the developing agent upward. The developing agent container can include a first wall portion for receiving the developing agent through the opening. The first wall portion extends from the lower edge in a downstream direction with respect to a rotational direction of the conveying member toward a bottommost portion of the supply roller. The container also includes a second wall portion extending from the upper edge in an upstream direction. The conveying member can be in simultaneous sliding contact with the first and the second wall portions.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: July 8, 2014
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Shougo Sato
  • Publication number: 20140178107
    Abstract: Provided is an image forming device in which the cost needed for a roller member as a whole can be reduced, as well as a manufacturing process of the roller member can be simplified, and a method of manufacturing the roller member. Provided is an image forming device comprising, on the outer periphery of a shaft, at least two types of rollers each having an elastic layer composed of polyurethane foam of the same composition, in which the at least two types of rollers are selected from the group consisting of a toner feed roller, a transfer roller and a cleaning roller. At least one of the at least two types of rollers is preferably subjected to a heat pressing process.
    Type: Application
    Filed: August 8, 2012
    Publication date: June 26, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Toru Masuyama
  • Publication number: 20140153944
    Abstract: In an image forming apparatus that is provided with a developing unit to develop an electrostatic latent image formed on an image carrier as a toner image, the developing unit is provided with a developer reservoir that is disposed between a supplying roller to feed developer agitated by an agitating member into the developer reservoir and a developing roller to cause the developer in the developer reservoir to adhere onto the latent image on the image carrier so as to be developed as the toner image. A control section controls driving of the supplying roller, independently from driving of the agitating member.
    Type: Application
    Filed: November 22, 2013
    Publication date: June 5, 2014
    Applicant: Konica Minolta, Inc.
    Inventor: Takumi SAKURADA
  • Patent number: 8737888
    Abstract: A development device includes: a developer carrier that is positioned to oppose an electrostatic latent image carrier and that supplies a developer to the electrostatic latent image carrier; a developer supply member that is positioned to oppose the developer carrier and that supplies the developer to the developer carrier; a developer charging member that is positioned to oppose the developer supply member and that charges the developer.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: May 27, 2014
    Assignee: Oki Data Corporation
    Inventor: Takuya Goto
  • Patent number: 8731446
    Abstract: A developer supply device includes a developer-carrying body having a developer-carrying surface that faces an intended device in a first position and moves in a moving direction, a first transfer board that faces the developer-carrying surface in a second position upstream relative to the first position in the moving direction and transfers the developer to the second position in a direction opposite to the moving direction in the second position, an electrification member facing the developer-carrying surface in a third position downstream relative to the second position and upstream relative to the first position in the moving direction, and a second transfer board that faces the developer-carrying surface in a fourth position downstream relative to the first position and upstream relative to the second position in the moving direction and transfers the developer to a developer storage section in a direction identical to the moving direction in the fourth position.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: May 20, 2014
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Keisuke Takahashi, Kazuna Taguchi