Sleeve Patents (Class 399/276)
  • Patent number: 11029622
    Abstract: Provided is a developer carrying member that enables stable formation of images of high quality even on recording paper having a high talc content. The developer carrying member includes a conductive base member and a surface layer, wherein the surface layer includes a urethane resin, and the urethane resin has a carbonate bond and a tertiary amine structure.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: June 8, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Sosuke Yamaguchi, Minoru Ito, Takashi Koyanagi, Takahiro Miyazawa, Shohei Urushihara, Kentarou Nakamura
  • Patent number: 10976684
    Abstract: Provided is a developer carrying member that enables stable formation of images of high quality even on recording paper having a high talc content. The developer carrying member includes a conductive base member and a surface layer, wherein the surface layer includes a urethane resin, and the urethane resin has a carbonate bond and a tertiary amine structure.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: April 13, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Sosuke Yamaguchi, Minoru Ito, Takashi Koyanagi, Takahiro Miyazawa, Shohei Urushihara, Kentarou Nakamura
  • Patent number: 10795276
    Abstract: A conductive roller includes a supporting member and a conductive elastic foam layer disposed on the supporting member. In a spectrum of amplitude (?m) vs. period (?m) obtained by subjecting a roughness waveform of the outer circumferential surface of the conductive elastic foam layer in an axial direction to fast Fourier transformation, the integrated value St of the amplitude within a period range of 100 ?m or more and 300 ?m or less is 455 ?m or less.
    Type: Grant
    Filed: January 28, 2020
    Date of Patent: October 6, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Minoru Rokutan, Kenta Shingu
  • Patent number: 10725397
    Abstract: A developing apparatus includes a sleeve for carrying a developer including toner and magnetic carrier, the sleeve having a plurality of grooves extending in a longitudinal direction; a magnet provided inside the sleeve, a non-magnetic regulating member, provided spaced from the sleeve, wherein an amount M/S (mg/mm2) of the developer carried on a unit area of the sleeve after passing by the regulating member, a gap SB (mm) between a free end of the regulating member and the sleeve, a density G (mg/mm3) of the developer, and a groove ratio ? which is a ratio of the grooves in the surface of the sleeve satisfy, 0.1?M/S (mg/mm2)?0.5, 0.2?SB (mm), and m/S (mg/mm2)×¼??×{SB(mm)+D(mm)}×G(mg/mm3)<M/S (mg/mm2).
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: July 28, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tomoyuki Sakamaki, Mitsuhiro Furukawa
  • Patent number: 10416593
    Abstract: A developing device includes a developing container, a developing sleeve, a magnet and grooves provided at a surface of the sleeve and formed along a direction crossing a circumferential direction of the sleeve. In a cross-section, each of the grooves is formed by a flat bottom portion contacting a carrier particle and a pair of side surface portions provided in both sides of the flat bottom portion with respect to the circumferential direction of the sleeve and satisfies the following relationship: r<w<2r, 2×r<L, and r/2?s<2r. In the above, r is a volume-average particle size of the carrier particles, w is a length of the flat bottom portion, L is a width between the side surface portions at the surface of the sleeve, and s is a depth of each of the grooves.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: September 17, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yusuke Ishida, Takanori Iida, Yasushi Takeuchi, Toshiyuki Yamada, Shiro Higashikozono, Hiroto Kakinuma, Toshiya Kobayashi
  • Patent number: 10401756
    Abstract: An image forming apparatus includes a rotatable image bearing member and a rotatable developer bearing member. The image bearing member, configured to carry a toner image, includes first recess portions provided at intervals substantially equal to a first pitch Pdr (mm) in a rotation direction of the image bearing member. The developer bearing member, configured to carry developer comprising toner and carrier and to form the toner image on the image bearing member, includes second recess portions provided at intervals substantially equal to a second pitch Ps (mm) in a rotation direction of the developer bearing member. The following relationship is satisfied Vs/Vdr<Ws/Pdr where Vdr represents a movement speed (mm/sec) of the first recess portions, Vs represents a movement speed (mm/sec) of the second recess portions, and Ws represents a length (mm) of each of the second recess portions in the rotation direction of the developer bearing member.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: September 3, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomoyuki Sakamaki
  • Patent number: 10222726
    Abstract: A developing device includes a development roller, a layer-thickness limiting member, and a first screw. The development roller includes a fixed magnet and a sleeve. The first screw supplies developer to the development roller while conveying the developer in a first conveyance direction. The sleeve includes a plurality of recesses. Each of the recesses has an elongated shape, and a downstream end and an upstream end in the first conveyance direction. The downstream end is located farther downstream in a rotational direction of the sleeve than the upstream end. When the developer in each of the recesses passes the layer-thickness limiting member, the developer moves upstream in the first conveyance direction.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: March 5, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tamotsu Shimizu
  • Patent number: 9996026
    Abstract: A developer carrying member is disposed below a storage chamber of a frame and has a surface configured such that a plurality of dielectric portions are dispersed on a conductive portion, an upper region of the storage chamber of the frame is enlarged further in a horizontal direction than a lower region in which the developer carrying member is disposed, and the frame has a lower guide surface and includes a curved surface having a tangent plane inclined at a first angle equal to or greater than a degree of an angle of repose of the developer and less than 90 degrees, in an inner wall of the lower region, and an upper guide surface includes a curved surface having a tangent plane inclined at a second angle that is less than the first angle relative to a horizontal plane in an inner wall of the upper region.
    Type: Grant
    Filed: March 28, 2017
    Date of Patent: June 12, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kazuhiro Okubo, Jun Miura, Takaaki Shinkawa
  • Patent number: 9760037
    Abstract: A developing apparatus includes a sleeve for carrying a developer including toner and magnetic carrier, the sleeve having a plurality of grooves extending in a longitudinal direction; a magnet provided inside the sleeve, a non-magnetic regulating member, provided spaced from the sleeve, wherein an amount M/S (mg/mm2) of the developer carried on a unit area of the sleeve after passing by the regulating member, a gap SB (mm) between a free end of the regulating member and the sleeve, a density G (mg/mm3) of the developer, and a groove ratio ? which is a ratio of the grooves in the surface of the sleeve satisfy, 0.1?M/S (mg/mm2)?0.5 0.2?SB (mm), and m/S (mg/mm2)×¼??×{SB (mm)+D (mm)}×G (mg/mm3)<M/S (mg/mm2).
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: September 12, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomoyuki Sakamaki, Mitsuhiro Furukawa
  • Patent number: 9733594
    Abstract: A developing device includes a developing container, a developing sleeve, a magnet and grooves provided at a surface of the sleeve and formed along a direction crossing a circumferential direction of the sleeve. In a cross-section, each of the grooves is formed by a flat bottom portion contacting a carrier particle and a pair of side surface portions provided in both sides of the flat bottom portion with respect to the circumferential direction of the sleeve and satisfies the following relationship: r<w<2r, 2×r<L, and r/2?s<2r. In the above, r is a volume-average particle size of the carrier particles, w is a length of the flat bottom portion, L is a width between the side surface portions at the surface of the sleeve, and s is a depth of each of the grooves.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: August 15, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yusuke Ishida, Takanori Iida, Yasushi Takeuchi, Toshiyuki Yamada, Shiro Higashikozono, Hiroto Kakinuma, Toshiya Kobayashi
  • Patent number: 9454103
    Abstract: A developing device includes a developing member and a carrier collecting member. An outer surface of the developing member includes a plurality of protrusion portions aligned at regular intervals that are equal to or larger than an average particle diameter of toner particles and smaller than an average particle diameter of magnetic carrier particles. Each protrusion portion has a first face formed at one side of an apex of each protrusion portion and a second face formed at the other side of the apex, and an inclination angle of the first face is less than an inclination angle of the second face. In the circumferential direction of the developing member, when a downward direction of the first face is set to be positive, a relative velocity of a surface velocity of an image bearing member to a surface velocity of the developing member is set to be positive.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: September 27, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kenta Kubo, Tomohito Ishida, Shunichi Takada, Koichi Hashimoto, Tatsuya Tada
  • Patent number: 9389739
    Abstract: The invention discloses devices and methods for transferring a tactile signal through an inert piece of material. In some embodiments, clear, impact resistant covers are employed with devices including touch-sensitive screens. The instant invention, in some embodiments, employs a plurality of magnets to allow one to input information on a touch-sensitive screen through the inert cover. Contact of a magnet pair above the cover may allow for a signal to be delivered to the touch-sensitive display via a second magnet pair that includes a stylus adapted to activate the surface of the display.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: July 12, 2016
    Inventor: Netanel Raisch
  • Patent number: 9372439
    Abstract: A developing device includes a developing member, a toner supplying member, and a carrier recovering member configured to recover magnetic carrier particles from the toner supplying member. An outer surface of the toner supplying member includes a plurality of protrusion portions with a regular interval between adjacent protrusion portions. The regular interval is equal to or larger than a particle diameter of a toner particle having an average particle diameter from among the particle diameters of the toner particles and smaller than a carrier particle diameter of a magnetic carrier particle having an average particle diameter from among the particle diameters of the magnetic carrier particles. The protrusion portions protrude from the remainder of the outer surface of the toner supplying member with a height that is smaller than the average particle diameter of the toner particles.
    Type: Grant
    Filed: February 4, 2015
    Date of Patent: June 21, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kenta Kubo, Tatsuya Tada, Satoru Yamanaka, Hideaki Okamoto
  • Patent number: 9366988
    Abstract: A developing device configured to develop an electrostatic image includes a developing member and a carrier recovering member. An outer surface of the developing member includes a plurality of protrusion portions which extend in a direction intersecting a toner particle carrying direction and are aligned with a regular interval between adjacent protrusion portions. The regular interval is equal to or larger than a particle diameter of a toner particle having an average particle diameter from among the toner particles and smaller than a carrier particle diameter of a magnetic carrier particle having an average particle diameter from among the magnetic carrier particles. The protrusion portions protrude from the outer surface of the developing member with a height that is smaller than the average particle diameter of the toner particles, and the developing member contacts with the image bearing member at a developing portion.
    Type: Grant
    Filed: January 15, 2015
    Date of Patent: June 14, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kenta Kubo, Hideaki Okamoto, Satoru Yamanaka, Tatsuya Tada
  • Patent number: 9235158
    Abstract: A developing device includes a developing sleeve having a plurality of grooves, and a magnetic field generating portion configured to be disposed on an inner side of the developing sleeve and including at least a drawing-up pole and a cut pole. The magnetic field generating portion is configured to form. a Fr attenuation area and a F? reverse area between a peak of a magnetic flux density of the drawing-up pole and a peak of a magnetic flux density of the cut pole. Fr attenuates toward the cut pole side from the drawing-up pole side in the Fr attenuation area and F? is oriented towards an opposite direction to a direction of rotation of the developing sleeve in the F? reverse area. A pitch interval of the plurality of grooves is shorter than a length of the F? reverse area in the direction of rotation of the developing sleeve.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: January 12, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yusuke Ishida
  • Patent number: 9189015
    Abstract: A computer apparatus includes a base and a display device. The base includes a first casing and a ferromagnetic unit fastened to the first casing. The display device includes a second casing having a connecting side portion and a magnetic unit. In a first use state, the connecting side portion of the second casing is adjacent to the first casing of the base, and an angle formed therebetween is adjustable. The magnetic unit is fastened to the connecting side portion of the second casing, and magnetically attracts ferromagnetic unit of the base, thereby permitting sliding of the display device relative to the base without separating therefrom.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: November 17, 2015
    Assignee: Wistron Corporation
    Inventors: Tien Chung Tseng, Chen Yi Liang, Hung Chih Chen
  • Patent number: 9146504
    Abstract: A developing device includes a developing roller. The developing roller includes a magnetic roller configured to have multiple magnetic poles in a circumferential direction thereof and a roller-shaped developing sleeve sheathed on the magnetic roller, and supplies magnetic toner to a photosensitive drum. Further, the developing sleeve is configured such that a surface of an image region thereof, which is located in an intermediate portion thereof in a rotation axis direction thereof and which supplies the magnetic toner to the photosensitive drum, is coated with a non-magnetic material, and such that surfaces of non-image regions thereof, which are located at opposite ends thereof in the rotation axis direction and which supply no magnetic toner to the photosensitive drum, are coated with a magnetic material.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: September 29, 2015
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Koji Kuramashi
  • Patent number: 9122194
    Abstract: A developing roller includes a roller main body disposed to face, without contact, an outer circumferential surface of an image carrier. The roller main body includes a resin coat layer that is formed on an outer circumferential surface of a base body that is made of a metal including aluminum, the resin coat layer being made of a resin material and having electric conductivity. An AC impedance Z obtained from an application of an AC voltage at a frequency in a range from 0.05 Hz to 100 Hz is equal to or higher than 100?, and a phase angle ? satisfies a relationship of 0 rad<?<0.1 rad when a power factor is cos ?=Za/Z.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: September 1, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tamotsu Shimizu, Yuji Kamiyama, Akihiro Watanabe, Yoshinobu Yoneima, Shizuka Okada, Sakae Saito, Yasuhiro Oishi
  • Patent number: 9122193
    Abstract: A developing roller includes a roller main body disposed to face, without contact, an outer circumferential surface of an image carrier. A resin coat layer has been formed on an outer circumferential surface of the roller main body, the resin coat layer being made of a resin material having electric conductivity. A product of resistance component Rs [?] and electrostatic capacitance component Cs [F] in AC impedance Z of the roller main body is in a range from 2.79×10?7 to 6.77×10?5, the AC impedance Z being obtained when an AC voltage of a predetermined frequency f is applied.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: September 1, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Yoshinobu Yoneima, Yuji Kamiyama, Akihiro Watanabe, Tamotsu Shimizu, Shizuka Okada, Sakae Saito, Yasuhiro Oishi, Chikara Ishihara, Masashi Fujishima, Yoshimi Shimizu, Yasuhiro Tauchi, Yu Sasaki
  • Patent number: 9098011
    Abstract: A typical configuration of a development device for an image forming apparatus includes a development sleeve and an electrode portion. In the development device, a pre-bias is applied between the electrode portion and the photosensitive drum, a DC voltage is applied to the development sleeve, a development bias is applied between the development sleeve and the photosensitive drum, the toner in the developer on the development sleeve is moved to the photosensitive drum, and an electrostatic latent image is developed on the photosensitive drum. In the development device, the electric field intensity between the electrode portion and the development sleeve by the pre-bias is larger than the electric field intensity between the image bearing member and the development sleeve by the development bias.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: August 4, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shohei Okumura
  • Patent number: 9026012
    Abstract: A developer carrying member is provided the surface layer of which can make a developer stable by controlling its triboelectric charging strongly and which can maintain a high image quality over a long period of time even where a developer made highly spherical-particle or a small-particle developer is used. The developer carrying member has a substrate and a surface layer. The surface layer is a cured product of a resin composition containing a binder resin, conductive particles, a quaternary ammonium salt and an azo metal complex compound, the binder resin has in the molecular structure at least one structure selected from the group consisting of an —NH2 group, an ?NH group and an —NH— linkage, and the azo metal complex compound is a compound represented by the formula (1) as defined in the specification.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: May 5, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Otake, Masayoshi Shimamura, Yasutaka Akashi, Takuma Matsuda, Minoru Ito, Kazuhito Wakabayashi, Atsushi Noguchi, Hironori Mori
  • Publication number: 20150104221
    Abstract: A developing device includes a developing roller. The developing roller includes a magnetic roller configured to have multiple magnetic poles in a circumferential direction thereof and a roller-shaped developing sleeve sheathed on the magnetic roller, and supplies magnetic toner to a photosensitive drum. Further, the developing sleeve is configured such that a surface of an image region thereof, which is located in an intermediate portion thereof in a rotation axis direction thereof and which supplies the magnetic toner to the photosensitive drum, is coated with a non-magnetic material, and such that surfaces of non-image regions thereof, which are located at opposite ends thereof in the rotation axis direction and which supply no magnetic toner to the photosensitive drum, are coated with a magnetic material.
    Type: Application
    Filed: October 10, 2014
    Publication date: April 16, 2015
    Inventor: Koji Kuramashi
  • Publication number: 20150104220
    Abstract: A developing apparatus includes a sleeve for carrying a developer including toner and magnetic carrier, the sleeve having a plurality of grooves extending in a longitudinal direction; a magnet provided inside the sleeve, a non-magnetic regulating member, provided spaced from the sleeve, wherein an amount M/S (mg/mm2) of the developer carried on a unit area of the sleeve after passing by the regulating member, a gap SB (mm) between a free end of the regulating member and the sleeve, a density G (mg/mm3) of the developer, and a groove ratio ? which is a ratio of the grooves in the surface of the sleeve satisfy, 0.1?M/S(mg/mm2)?0.5 0.2?SB(mm), and m/S(mg/mm2)×1/4??×{SB(mm)+D(mm)}×G(mg/mm3)<M/S(mg/mm2).
    Type: Application
    Filed: April 26, 2013
    Publication date: April 16, 2015
    Inventors: Tomoyuki Sakamaki, Mitsuhiro Furukawa
  • Publication number: 20150078788
    Abstract: A developing device includes a developer bearer to carry, by rotation, developer including toner and magnetic carrier to a development range facing a latent image bearer, and the developer bearer includes a magnetic field generator having multiple magnetic poles and a cylindrical developing sleeve to rotate and bear developer on an outer circumferential face thereof with magnetic force of the magnetic field generator provided inside the developing sleeve. The developing sleeve receives developing bias voltage including an AC component, and includes a base to maintain a cylindrical shape of the developing sleeve and a low friction surface layer including a material lower in friction coefficient with toner than a material of the base.
    Type: Application
    Filed: August 5, 2014
    Publication date: March 19, 2015
    Inventors: Toshio KOIKE, Kiyonori TSUDA, Yutaka TAKAHASHI, Yuichi AIZAWA, Keinosuke KONDOH, Kentaro MIKUNIYA
  • Patent number: 8909104
    Abstract: According to a representative configuration of the developing device and the image forming apparatus of the present invention, the developing device includes: a developing sleeve which bears developer and conveys the developer to a developing region; a developing chamber which supplies the developer to the developing sleeve; an agitating chamber which forms a circulation path with the developing chamber and collects the developer from the developing sleeve; and a conveying unit (a first conveying screw and a second conveying screw) which circulates and conveys the developer in the circulation path. A spiral groove is formed on a surface of the developing sleeve so as to apply a conveying force to the developer in a rotation axis direction of the developing sleeve opposite to a developer conveying direction of the agitating chamber.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: December 9, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Koji Shigehiro
  • Publication number: 20140356031
    Abstract: A roller includes a cylindrical body having openings on both ends thereof and a press-fit member fitted in at least one of the openings of the cylindrical body with an outer circumferential face thereof in contact with an inner face of the cylindrical body. The outer circumferential face of the press-fit member is grooved obliquely to an axis of the cylindrical body, and the inner face of the cylindrical body is smooth at least in a portion that contacts the outer circumferential face of the press-fit member.
    Type: Application
    Filed: May 22, 2014
    Publication date: December 4, 2014
    Applicant: RICOH COMPANY, LTD.
    Inventors: Yuki Moro, Noriyuki Kamiya, Hiroya Abe, Masashi Nakayama, Soichiro Fukutomi, Rei Suzuki, Takashi Innami, Yuusuke Arai
  • Patent number: 8843035
    Abstract: A developing device includes a developer bearing member, a layer restricting member, a facing magnet and a nonmagnetic member. The developer bearing member has a sleeve for bearing magnetic toner and a fixed magnet included inside the sleeve. The layer restricting member faces one magnetic pole of the fixed magnet, is arranged at a distance from the sleeve and made of a magnetic material. The facing magnet is arranged upstream of the layer restricting member in a rotation direction of the sleeve and at a distance from the sleeve, includes a first facing surface facing a position overlapping with a position with a maximum magnetic force of the one magnetic pole and has a magnetic pole having the same polarity as the one magnetic pole on the first facing surface. The nonmagnetic member is connected at an upstream side of the facing magnet in the rotation direction.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: September 23, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventors: Tamotsu Shimizu, Shizuka Okada
  • Patent number: 8792810
    Abstract: A developer carrying member is provided which can maintain a high image quality over a long period of time even where a highly triboelectrically chargeable developer is used. The developer carrying member has a substrate and a surface layer. The surface layer is a cured product of a resin composition containing a binder resin, conductive particles, a quaternary phosphonium salt and an azo metal complex compound, the binder resin has in the molecular structure at least one structure selected from the group consisting of an —NH2 group, an ?NH group and an —NH— linkage, and the azo metal complex compound is a compound represented by the formula (1) as defined in the specification.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: July 29, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Minoru Ito, Masayoshi Shimamura, Yasutaka Akashi, Satoshi Otake, Takuma Matsuda, Kazuhito Wakabayashi, Atsushi Noguchi, Hironori Mori
  • Publication number: 20140161493
    Abstract: The developing device includes: a developing container that stores a developer including a non-magnetic toner and a magnetic carrier; a toner bearing member that bears the toner and conveys the toner to a developing portion; and a separating portion wherein a surface of the toner bearing member includes a plurality of recess structures in which a smallest opening width R is equal to or larger than rt10 and equal to or smaller than rc10, and a depth D is equal to or larger than rt10/2, where rt10 is a particle diameter in which an accumulated number distribution in a toner granularity distribution is 10%, and rc10 is a particle diameter in which an accumulated number distribution in a carrier granularity distribution is 10%; and a percentage of the recess structures per unit area in a toner bearing region of the toner bearing member is equal to or larger than 55%.
    Type: Application
    Filed: December 5, 2013
    Publication date: June 12, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kenta Kubo, Tatsuya Tada, Satoru Yamanaka, Hideaki Okamoto
  • Patent number: 8731444
    Abstract: A develop roller includes a magnet roller, and a develop sleeve containing the magnet roller and comprising a plurality of depressions in an elliptic shape regularly arranged with an interval in a longitudinal direction on a surface onto which developer is attracted by a magnetic force of the magnet roller, wherein the depressions are arranged such that a longitudinal direction of the depressions is intersected with the longitudinal direction of the develop sleeve, and a downstream side of the depressions are formed to be deeper than an upstream side in a rotary direction of the develop sleeve.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: May 20, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Masayuki Ohsawa, Toshio Kojima, Kyohta Koetsuka, Yoshiyuki Takano, Noriyuki Kamiya, Takashi Innami, Takumi Terasaka
  • Patent number: 8682230
    Abstract: A development device including a developer container, a developer bearer, a magnetic field generator, a developer agitator to supply the developer to the developer bearer, and a developer regulator to adjust a layer thickness of the developer carried on the developer bearer. Multiple oval recesses oblique to the axial direction of the developer bearer are formed in the outer circumferential surface of the developer bearer and arranged in a circumferential direction and the axial direction thereof. An upstream inner wall of the recess in the rotational direction of the developer bearer applies a force to the developer as the developer bearer rotates, and an angle between a long axis of the recess and the axial direction is set so that the force applied by the upstream inner wall of the recess has a component in a direction substantially identical to the developer conveyance direction of the developer agitator.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: March 25, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Nobuyuki Taguchi, Katsumi Masuda, Takamasa Ozeki, Yuuki Satoh, Toshiki Hayashi, Kyohta Koetsuka, Toshio Kojima, Masayuki Ohsawa, Noriyuki Kamiya, Takumi Terasaka
  • Patent number: 8649715
    Abstract: An image forming apparatus includes: a developing device that allows a developer to be retained on a developer carrier having a magnet member equipped with a plurality of magnetic poles mounted on an inner periphery thereof and rotates the developer carrier to deliver the developer to an image carrier and that forms a toner image by supplying the toner of the developer to the image carrier by applying a developing bias voltage from a bias voltage source between the developer carrier and the image carrier; a transfer device for transferring the toner image formed on the image carrier to a transfer receiving material; a toner recovery device for recovering the toner remaining on the surface of the image carrier after the transfer of the toner image; and a toner return device for returning to the developing device the toner recovered by the toner recovery device.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: February 11, 2014
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventor: Takashi Gonda
  • Publication number: 20140023408
    Abstract: There is provided a developing device including a first developing roller that is disposed to be rotatable with a desired distance set between the first developing roller and an outer circumferential surface of a rotatable latent image holding member, transports a developer onto an outer circumferential surface thereof while holding the developer by magnetic force, and has a substantially cylindrical shape, and a second developing roller that is disposed to be rotatable with desired distances set between the second developing roller and the respective outer circumferential surfaces of the corresponding latent image holding member and the corresponding first developing roller at a position on the downstream side of the first developing roller in a rotation direction of the latent image holding member, transports the developer onto an outer circumferential surface thereof while holding the developer by magnetic force, and has a substantially cylindrical shape.
    Type: Application
    Filed: January 29, 2013
    Publication date: January 23, 2014
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Masanori KATO, Nobumasa FURUYA, Jun ABE, Sakae YOSHIOKA
  • Patent number: 8626039
    Abstract: A developing device includes a non-magnetic rotatable sleeve of a developer bearer to bear developer and a development electric field generator to generate a development electric field between the image bearer and the developer bearer by applying a development bias to the developer bearer. The developing bias is an AC bias generating an AC electric field therebetween. The magnetic carrier includes a plurality of fine particles each covered by a covering layer made of prescribed material having a volume resistivity equal to or more than 1012 [?·cm] having a prescribed particle diameter equal to or less than 100 [nm]. Each of the a plurality of fine particles has a total volume resistivity equal to or less than 105 [?·cm]. The magnetic carrier has a total volume resistivity equal to or more than 1012 [?·cm].
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: January 7, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Katsuhiro Aoki, Akira Azami, Daichi Yamaguchi, Akihiro Kawakami
  • Patent number: 8565652
    Abstract: A development roller includes a magnet roller and a rotatably supported development sleeve including inside thereof the magnet roller, the development sleeve is formed in a cylindrical shape and configured such that a shaft center of the cylindrical shape is inconsistent with a rotation axis of the development sleeve, the development sleeve includes an outer surface provided with many circular or elliptical depressions in a planar view, the depressions being regularly arranged at intervals, and a depth of the depression provided in a portion of the outer surface close to the rotation axis is larger than a depth of the depression provided in a portion of the outer surface far from the rotation axis.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: October 22, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Takumi Terasaka, Toshio Kojima, Kyohta Koetsuka, Noriyuki Kamiya, Masayuki Ohsawa, Hiroya Abe
  • Patent number: 8548364
    Abstract: A developing device includes: an magnetic field generating unit that generates an magnetic field; and a cylindrical developer holder, to which a voltage is applied, that surrounds the magnetic field generating unit and rotates, the cylindrical developer holder: having an outer circumferential surface having a plurality of grooves that extend in a direction of a rotational axis, the outer circumferential surface being capable of holding developer including a magnetic substance by using the magnetic field generated by the magnetic field generation unit, an electrical resistance of an inner wall surface of each of the grooves being higher than an electrical resistance of the magnetic substance included in the developer; and supplying the developer to an image holder that holds an electrostatic latent image.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: October 1, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Shota Oba, Shigeru Inaba, Takashi Yamamuro, Takashi Ochi, Shinichi Kuramoto
  • Publication number: 20130243495
    Abstract: In the case where V-groove portions in a surface of a developing sleeve are located in the closest position between the developing sleeve and a regulating blade, an angle ? formed by a slope surface of the regulating blade with a downstream surface of a V-groove in a rotation direction of the developing sleeve is set to less than 90°.
    Type: Application
    Filed: February 26, 2013
    Publication date: September 19, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Yusuke Ishida
  • Publication number: 20130243494
    Abstract: A developing device includes a developer supporting rotator, toner supporting rotator and voltage application unit. The toner supporting rotator is arranged opposite to a developer supporting rotator, supports toner supplied from the developer supporting rotator, and forms a toner layer by a magnetic brush. The voltage application unit causes the toner supported by the toner supporting rotator to an electrostatic latent image on a surface of an image carrier to develop it into a toner image. A longitudinal end portion of the toner supporting side magnetic member is positioned longitudinally more outside than a longitudinal end portion of the developer supporting side magnetic member. A surface of the second rotating sleeve positioned more outside than the end of the developer supporting side magnetic member is composed of a surface of low adherence with lower toner adherence and a higher dielectric constant than those of a surface positioned inside thereof.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 19, 2013
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Tetsuya Toichi
  • Patent number: 8538303
    Abstract: A developer carrying member having less environmental dependence is provided. The developer carrying member has a substrate and a resin layer, which resin layer contains an acrylic resin; the acrylic resin having a unit (1) represented by the following formula (1) and a unit (2) represented by the following formula (2). In the formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents an alkylene group having 1 to 4 carbon atoms, and an asterisk * represents the part of linkage to the part shown by a double asterisk ** in the formula (2). In the formula (2), R3 represents a hydrogen atom or a methyl group; R4 represents an alkylene group having 1 to 4 carbon atom(s); R5, R6 and R7 each represent an alkyl group having 1 to 18 carbon atoms; A? represents an anion.
    Type: Grant
    Filed: November 1, 2012
    Date of Patent: September 17, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takuma Matsuda, Masayoshi Shimamura, Yasutaka Akahashi, Satoshi Otake, Minoru Ito, Kazuhito Wakabayashi, Atsushi Noguchi, Hironori Mori
  • Patent number: 8509659
    Abstract: The image forming apparatus is provided with first spacing members having an outer diameter larger than that of a first developing roller, which first spacing members are disposed at two ends of the first developing roller coaxially with the first developing roller, second spacing members having an outer diameter larger than that of a second developing roller, which second spacing rollers are disposed at two ends of the second developing roller coaxially with the second developing roller, a first retaining member, a second retaining member, a first biasing member, a second biasing member.
    Type: Grant
    Filed: November 13, 2009
    Date of Patent: August 13, 2013
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventor: Ichiro Sawano
  • Publication number: 20130136506
    Abstract: A developing device includes first and second developer carrying members for developing an electrostatic latent image formed on an image bearing member. The first developer carrying member has a surface provided with grooves and feeds a developer carried thereon to a first developing region which is an opposing portion where the first developer carrying member opposes the image bearing member. The second developer carrying member carries the developer delivered from the first developer carrying member and feeds the developer to a second developing region which is an opposing portion where the second developer carrying member opposes the image bearing member. The second developer carrying member has a surface provided with grooves different in angle from those of the surface of the first developer carrying member.
    Type: Application
    Filed: October 24, 2012
    Publication date: May 30, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: CANON KABUSHIKI KAISHA
  • Publication number: 20130108328
    Abstract: An image forming apparatus includes developing devices each including a developer carrying member for carrying a developer to develop an electrostatic latent image; and an image forming station capable of forming a toner image on a recording material by overlapping toner images formed by the developing devices, wherein in at least two of the developing devices, the developer carrying member has a surface provided with grooves at predetermined intervals, and wherein angles of the grooves relative to respective directions of generatrixes of the developer carrying members are different from each other.
    Type: Application
    Filed: October 18, 2012
    Publication date: May 2, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: CANON KABUSHIKI KAISHA
  • Patent number: 8372570
    Abstract: The present invention provides a developer carrying member capable of maintaining excellent charge imparting property even under long-term use. The present invention relates to a developer carrying member including a substrate and a resin layer, wherein the resin layer includes an acrylic resin having three specific structural units and electroconductive particles.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: February 12, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takuma Matsuda, Masayoshi Shimamura, Yasutaka Akashi, Satoshi Otake, Minoru Ito, Yoshiyuki Takayama, Kazuhito Wakabayashi
  • Patent number: 8284458
    Abstract: A detecting unit detects output-prohibit area information indicating an output-prohibit area from image data. An identifying unit identifies the output-prohibit area in the image data based on the output-prohibit area information detected by the detecting unit. A masking unit performs a masking on the output-prohibit area identified by the identifying unit. A rearranging unit rearranges an image of an area other than the output-prohibit area over the output-prohibit area on which the masking is performed by the masking unit. An outputting unit outputs image data obtained by rearranging the image by the rearranging unit.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: October 9, 2012
    Assignee: Ricoh Company, Ltd.
    Inventor: Taro Kikuchi
  • Publication number: 20120195647
    Abstract: A developing device includes a plurality of developer carrying members each for carrying at its surface a developer for developing an electrostatic latent image on an image bearing member. Of the plurality of developer carrying members, the developer carrying member requiring a largest driving torque resulting from the developer has a surface which has a plurality of grooves extending in parallel in a direction having a component of an axial direction of the developer carrying member at a predetermined interval, and wherein another developer carrying member has a blasted surface.
    Type: Application
    Filed: January 12, 2012
    Publication date: August 2, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Katsuya Nose, Akihiro Noguchi, Asuna Fukamachi
  • Patent number: 8219009
    Abstract: A developer station for an electrographic printer is provided that reduces developer agitation. The developer station includes a sump of magnetic developer, and a magnetic brush roller mounted above said sump and having a rotatable magnetic core surrounded by a substantially cylindrical toning shell rotatably mounted with respect to the core. The toning shell defines a nip at its closest point to the photoconductor element. A toning shell and magnetic core radius along with the eccentric offset of the toning shell from the rotating magnetic core are used in combination with the magnetic properties of the rotating magnetic core to determine the radius of the toning shell and magnetic core to improve the skiving and removal of developer from the toning shell after the developer has passed through the nip with the photoconductor element.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: July 10, 2012
    Assignee: Eastman Kodak Company
    Inventor: Eric C. Stelter
  • Patent number: 8175501
    Abstract: A development roller, including a development sleeve disposed near a photo conductive drum, a magnetic roller disposed in the development sleeve, and a supplying device configured to supply a developer including a toner and a magnetic carrier to the photo conductive drum uniformly, the development sleeve having an outer surface on which the developer including the toner and the magnetic carrier is adsorbed by a magnetic force of the magnetic roller.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: May 8, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Noriyuki Kamiya, Tsuyoshi Imamura, Sumio Kamoi, Kyohta Koetsuka, Yoshiyuki Takano, Mieko Terashima, Satoshi Terashima, Hiroya Abe, Shigeharu Nakamura, Masaki Watanabe
  • Patent number: 8170453
    Abstract: A sleeve constituting a developing roller of a developing device has a cylindrical body with three layers composed of a base layer having rigidity and formed in a mesh-like shape, a filter layer for blocking toner passage, and a conductive layer to which a developing bias voltage is applied, which are arranged in this order from the inside. When a sucking device sucks from an open end of one end portion of the sleeve, an air flow going from the inside of the developing roller through the open end to outside is generated so that a pressure of the internal space of the developing roller becomes smaller compared with the outside. As the peripheral wall has air permeability in its thickness direction, air flows from the outer circumferential portion of the developing roller through the peripheral wall to the inside of the developing roller.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: May 1, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Shuichi Akedo
  • Patent number: 8155571
    Abstract: A developing roller for providing a magnetic brush for a printer or copier has a substantially cylindrical outer surface. The outer surface includes a regular or irregular array of a number of isolated areas, each isolated area being provided by a recess in the outer surface. Each recess is completely surrounded on all sides and isolated from any neighbouring isolated area by separation zones being part of the substantially cylindrical outer surface.
    Type: Grant
    Filed: April 25, 2008
    Date of Patent: April 10, 2012
    Assignee: Xeikon Manufacturing N.V.
    Inventor: Bart Van Dessel
  • Patent number: 8135316
    Abstract: An image forming device comprises a process cartridge. The process cartridge comprises a development roller. The development roller comprises a magnet roller and a developing sleeve 132. The magnet roller is fixed. The depressions 139 each having an oval shape are formed on the external surface of the developing sleeve 132. Both ends of the depressions 139 which are adjacent with each other along the longitudinal direction of the developing sleeve 132 are overlapped with each other and both ends of the depressions 139 which are adjacent with each other along the circumferential direction of the developing sleeve 132 are spaced with each other.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: March 13, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshio Kojima, Kyohta Koetsuka, Noriyuki Kamiya, Rei Suzuki, Tadaaki Hattori, Yoshiyuki Takano, Masayuki Ohsawa, Hiroya Abe, Takashi Innami