Sleeve Patents (Class 399/276)
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Patent number: 7406279Abstract: A development subsystem is used to develop toner particles transported by semiconductive carrier particles.Type: GrantFiled: October 31, 2005Date of Patent: July 29, 2008Assignee: Xerox CorporationInventors: James M. Chappell, Patrick J. Howe, Michael D. Thompson
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Patent number: 7400849Abstract: A magnetic one-component toner of the invention contains at least a binding resin and a magnetic powder, and has a volume average particle size of 6.0 to 9.0 ?m, a compressibility of 15 to 50%, and a mean roundness of 0.950 to 0.960. The magnetic powder has at its surface a phosphorus element of 0.10 to 0.50% by weight. This toner is suitable for use in an image forming apparatus provided with a developer carrier made of stainless steel, or an image forming apparatus provided with an amorphous silicon photosensitive material. This toner has high transfer efficiency and less fog, thereby enabling to maintain image density for a long period of time, and form high image-quality image.Type: GrantFiled: June 23, 2005Date of Patent: July 15, 2008Assignee: Kyocera Mita CorporationInventor: Hidekazu Tamura
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Patent number: 7394570Abstract: A method of modifying screened image data so that there is no visible seam when the image is printed repeatedly in a circumferential direction, for example using a drum output device. One version applicable to images screened using a supercell includes cutting the image so that the image size in the circumferential direction is an integral number of screen supercells. Another version includes displacing halftone dots in a neighborhood of the seam such that the seam is not visible in a repeated print.Type: GrantFiled: May 20, 2003Date of Patent: July 1, 2008Assignee: Esko-Graphics Imaging GmbHInventors: Thomas Klein, Nils Kay, Kim Skovgaard Jensen
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Patent number: 7389073Abstract: A development station in an electrostatographic imaging machine supports longer operational life without undue variation in the mass of developer on roll parameter. The development station includes a developer housing, for retaining a quantity of developer having semi-conductive carrier particles and toner particles, a first magnetic roll having a stationary core with at least one magnet and a sleeve having longitudinal grooves that rotates about the stationary core of the first magnetic roll to transport developer to a photoreceptor, a second magnetic roll having a stationary core with at least one magnet and a sleeve having longitudinal grooves that rotates about the stationary core of the second magnetic roll to receive developer from the first magnetic roll and present the developer to the photoreceptor, the sleeve of the second magnetic roll being fabricated from a material that is softer than the sleeve of the first magnetic roll.Type: GrantFiled: March 29, 2006Date of Patent: June 17, 2008Assignee: Xerox CorporationInventors: Ajay Kumar, Keith Allan Nau, David Antwone Reed, Hirotsugu Oba
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Patent number: 7366453Abstract: A development subsystem is used to develop developer having semiconductive carrier particles and toner particles. The development subsystem includes a developer housing, for retaining a quantity of developer having semiconductive carrier particles and toner particles, a first magnetic roll having a stationary core with at least one magnet and a sleeve that rotates about the stationary core of the first magnetic roll, a second magnetic roll having a stationary core with at least one magnet and a sleeve that rotates about the stationary core of the second magnetic roll, and a motor coupled to the first and the second magnetic rolls to drive the rotating sleeves of the first and the second magnetic rolls in a direction that is against the direction of a photoreceptor that rotates in proximity to the first and the second magnetic rolls. The first and the second magnetic rolls carry semiconductive carrier particles and toner particles through a development zone formed by the first and the second magnetic rolls.Type: GrantFiled: October 31, 2005Date of Patent: April 29, 2008Assignee: Xerox CorporationInventors: Michael D. Thompson, James M. Chappell, Steven C. Hart, Patrick J. Howe, Ajay Kumar, Steven R. Leroy, Paul W. Morehouse, Palghat S. Ramesh, Fei Xiao
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Patent number: 7361442Abstract: A developing method is provided in which a developer is carried on a developer carrying member, a thin layer of the developer is formed thereon and a latent image on a latent image bearing member is developed with a developer. The developer is composed of magnetic toner particles containing a binder resin and a magnetic powder. The magnetic powder has a saturation magnetization of 67.0 Am2/kg to 75.0 Am2/kg in a magnetic field of 79.6 kA/m (1,000 oersteds) and has a residual magnetization of 4.5 Am2/kg or less. In the surface profile of the conductive resin coat layer of the developer carrying member, the relationship 1.00?S/A?1.65 is satisfied where S is a surface area of regions zoned by an area A of microscopic unevenness regions from which parts exceeding a reference plane by 0.5×r (r: weight average particle diameter (?m) of a toner used) or more have been excluded.Type: GrantFiled: April 17, 2007Date of Patent: April 22, 2008Assignee: Canon Kabushiki KaishaInventors: Satoshi Otake, Masayoshi Shimamura, Yusutaka Akashi, Kazunori Saiki, Nene Dojo, Minoru Ito, Michihisa Magome, Eriko Yanase, Tatsuya Nakamura
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Publication number: 20080080905Abstract: An image forming apparatus includes an image carrier that carries a latent image; a charging device that charges the image carrier with a charging voltage having an AC component; and a roller that carries a developer to be supplied to the image carrier in a developing position, with a surface of the roller provided with axially-formed grooves, the frequency of the AC component of the charging voltage and the number of the grooves provided on the roller being set so that non-uniformity in density of an output image becomes invisible, caused by interference between the frequency of the AC component of the charging voltage and the frequency at which the grooves pass the developing position.Type: ApplicationFiled: April 13, 2007Publication date: April 3, 2008Inventors: Makoto Hirota, Takashi Yamamuro, Shigeru Inaba, Shota Oba, Akihiko Noda, Yoshifumi Ozaki
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Publication number: 20070201907Abstract: A developing apparatus includes: a developing sleeve that carries a mono-component developer; and a developing blade that abuts on the sleeve to regulate a layer thickness of the developer on the sleeve, wherein surface roughness parameters of the sleeve satisfy: 3.0?Rpk?9.0; and 2?Pc2?10. At an abutment portion between the sleeve and the blade, surface roughness parameters of the blade satisfy: 0.030?Sm?0.170; and 0.10?Rvk×(100?Mr2)/100?1.30, where Sm is a mean spacing of profile irregularities [mm]; Rpk is an initial wear height [?m]; Rvk is an oil retaining depth [?m]; Mr2 is a profile bearing length ratio 2 [%]; and Pc2 denotes the number of profile peaks having a height larger than a count level from a center line per the evaluation length of 1 mm.Type: ApplicationFiled: February 23, 2007Publication date: August 30, 2007Applicant: CANON KABUSHIK KAISHAInventors: Daisuke Baba, Masahiro Yoshida
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Patent number: 7260347Abstract: A developing apparatus having: a first developer carrying member close to a developer regulating member for regulating an amount of developer; a second developer carrying member to which the developer is delivered from the first developer carrying member; and a mode for removing the toner on the surface of the second developer carrying member, in which mode, in a non-image-formation period, no toner transfer operation from the first developer carrying member to an image bearing member is substantially performed, but a toner transfer operation from the second developer carrying member to the image bearing member is performed.Type: GrantFiled: October 17, 2005Date of Patent: August 21, 2007Assignee: Canon Kabushiki KaishaInventors: Masayuki Tamaki, Yuji Bessho
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Patent number: 7236728Abstract: A developing device for developing an electrostatic latent image, which is formed on an image-bearing body, with a developer which includes a toner and a carrier, the developing device comprises a developing roll, which includes a fixed magnet at an interior portion and a rotatable sleeve at an outer side thereof, and which is disposed to oppose the image-bearing body, rotates while carrying the developer, and conveys the developer to a developing region in a direction opposite to a direction of progress of the image-bearing body for developing the electrostatic latent image formed on the image-bearing body, wherein the developing roll includes a magnetic pole which includes, in a circumferential direction of the developing roll, at least two magnetic flux density peaks with the same polarity in the developing region, one of the magnetic flux density peaks opposing an end portion of the developing region at a downstream side in the direction of progress of the image-bearing body.Type: GrantFiled: March 2, 2005Date of Patent: June 26, 2007Assignee: Fuji Xerox Co., Ltd.Inventors: Akihiko Noda, Hirotaka Matsuoka, Tsutomu Kubo
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Patent number: 7214461Abstract: The toner of the present invention is suitably used in SLIC development system where a liner velocity of a developer-bearing member is 150 to 500 cm/sec. The toner has resin particles containing at least a coloring agent, and a charge controlling agent fine articles, and a ratio M/T of the amount M (% by weight) of an element in the surface of toner particles as determined by X-ray photoelectron spectroscopy (XPS) to the amount T (% by weight) of the element in the entire toner particles of 20 to 500, which element is present only in a charge control agent among components of the toner and is an element belonging to one of the first, second, third, fourth, and fifth periods of the long form of periodic table of elements except hydrogen, carbon, oxygen, and rare gas elements.Type: GrantFiled: July 10, 2006Date of Patent: May 8, 2007Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Yamashita, Kenzo Tatsumi
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Patent number: 7132211Abstract: A magnetic toner contains, as a magnetic powder, magnetic iron oxide having an octahedral particle shape and an average particle diameter of 0.21 ?m or larger and containing 18% or more by weight of FeO. The magnetic toner is so prepared as to have a bulk density A (g/cm3) and a magnetic powder content B (% by weight) that fulfill the formulae 0.8?A/B×100?1.6 and 35?B?50. This alleviates the reddishness of images produced with the magnetic toner, and alleviates the disturbance of a thin toner layer on a developing sleeve and thus the fogging resulting therefrom.Type: GrantFiled: September 9, 2005Date of Patent: November 7, 2006Assignee: Kyocera Mita CorporationInventors: Hiroko Sugimoto, Takashi Nagai, Toru Takatsuna, Seiji Kikushima
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Patent number: 7127200Abstract: A developing roller is provided having an elastic layer and a surface layer superposed thereon. The surface layer is formed of a resin material containing nitrogen atoms, and contains at least two types of particles, organic-compound particles (M) and organic-compound particles (N). The particles (N) are composed of nitrogen-containing heterocyclic-compound particles. The number-average particle diameter of the particles (N) in the surface layer is smaller than the number-average particle diameter of the particles (M) in the surface layer. Where the universal hardness of the elastic layer is represented by A and the universal hardness of the developing roller is represented by B, they satisfies 0.9?B/A?1.8.Type: GrantFiled: September 30, 2004Date of Patent: October 24, 2006Assignee: Canon Kabushiki KaishaInventors: Minoru Nakamura, Arihiro Yamamoto, Kazutoshi Ishida, Takeshi Suzuki
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Patent number: 7120379Abstract: The invention relates generally to processes for electrographic image development. An electrographic development apparatus is provided wherein a film is adjacent a cylindrical toning shell and a mixture of toner and carrier is particles disposed on the cylindrical toning shell in contact with the film. The cylindrical toning shell is closest to the film at a first location, the mixture of toner and carrier particles being movable through the first location with a flow direction. A magnetic core disposed within the cylindrical toning shell offset toward the cylindrical shell such that a magnetic field strength is greater at the second location than the first location.Type: GrantFiled: September 24, 2004Date of Patent: October 10, 2006Assignee: Eastman Kodak CompanyInventors: Edward Michael Eck, Thomas Joseph Foster
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Patent number: 7110710Abstract: The toner of the present invention is suitably used in SLIC development system where a liner velocity of a developer-bearing member is 150 to 500 cm/sec. The toner has resin particles containing at least a coloring agent, and a charge controlling agent fine articles, and a ratio M/T of the amount M (% by weight) of an element in the surface of toner particles as determined by X-ray photoelectron spectroscopy (XPS) to the amount T (% by weight) of the element in the entire toner particles of 20 to 500, which element is present only in a charge control agent among components of the toner and is an element belonging to one of the first, second, third, fourth, and fifth periods of the long form of periodic table of elements except hydrogen, carbon, oxygen, and rare gas elements.Type: GrantFiled: April 27, 2005Date of Patent: September 19, 2006Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Yamashita, Kenzo Tatsumi
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Patent number: 7054583Abstract: A developing device having a first developing sleeve for supplying developing agent to the first developing area A, and a second developing sleeve for supplying developing agent, handed from the first developing sleeve, to a second developing area B, the surfaces of the first developing sleeve and the second developing sleeve are subjected to roughening such that the average inter-peak distances thereof differ between the first developing sleeve and the second developing sleeve. This prevents fusion of toner due to toner particles becoming embedded in recesses of course formations on the surface of the developing sleeves, resulting in extensive usage periods yielding high image quality.Type: GrantFiled: October 2, 2003Date of Patent: May 30, 2006Assignee: Canon Kabushiki KaishaInventor: Fumitake Hirobe
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Patent number: 6990307Abstract: A device (100) for the transport of particles (30), in particular development particles (30) with a first magnetic roller (11) and a second magnetic roller (22) , in which the first magnetic roller (11) and the second magnetic roller (22) form a gap, and with a photographic element (1) for the particles (30), which moves through the gap, while the magnetic rollers (11, 22) turn in the same direction.Type: GrantFiled: June 10, 2003Date of Patent: January 24, 2006Assignee: Eastman Kodak CompanyInventor: Thomas Dera
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Patent number: 6975825Abstract: A developing apparatus includes a developer container containing a magnetic developer including a toner and a wax contained in the toner. First and second developer carrying members are rotatably provided in the developer container, for carrying the magnetic developer. A regulation member regulates a thickness of a layer of the magnetic developer carried on the first developer carrying member. A first magnet has a first magnetic pole disposed opposite to the second developer carrying member and a second magnetic pole, which is a subsequent magnetic pole, dispose downstream from the first magnetic pole in a rotation direction of the first developer carrying member and having a polarity identical to a polarity of the first magnetic pole. A second magnet has a third magnetic pole, which has a polarity opposite to a polarity of the first magnetic pole, is disposed opposite to the first developer carrying member.Type: GrantFiled: April 4, 2003Date of Patent: December 13, 2005Assignee: Canon Kabushiki KaishaInventors: Tomoyuki Sakamaki, Masaru Hibino, Fumitake Hirobe
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Patent number: 6973282Abstract: In a device for transporting toner in an electrophotographic printing or copying device, a rotatable cylinder has a cylinder sheath. The cylinder such includes a metallic layer having a surface with a roughness search that at least one of peaks and columns are provided along with recesses. The recesses of the surface are filled with plastic. Also, the cylinder sheath may include a layer of a porous ceramic material having a roughness.Type: GrantFiled: March 26, 2003Date of Patent: December 6, 2005Assignee: Oce Printing Systems GmbHInventors: Peter Schulmeister, Uwe Höllig
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Patent number: 6961535Abstract: An image forming apparatus including a cleaning device for removing toner, paper dust and other impurities left on an image carrier after image transfer with a cleaning member is disclosed. The cleaning member contacts the surface of the image carrier with variable pressure and remains, about the time when the image carrier stops moving after image formation, in contact with the surface with pressure lower than pressure capable of scrapping off the impurities. Before movement for image formation, the image carrier is driven in a reverse direction opposite to a forward direction assigned to image formation, stopped, and again moved in the forward direction and then in the reverse direction at least one time.Type: GrantFiled: October 19, 2004Date of Patent: November 1, 2005Assignee: Ricoh Company, Ltd.Inventors: Shinichi Kawahara, Satoshi Takano, Toshihiro Sugiyama, Hiroshi Saitoh, Hirokazu Ishii, Yuji Arai, Shigeru Yoshiki
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Patent number: 6947692Abstract: A method for developing an electrostatic latent image, including forming a magnet brush of a developer including a toner and a carrier on a developing sleeve including a main magnet and auxiliary magnets; and developing the electrostatic latent image with the magnet brush to form a toner image at a rubbing region, wherein the magnetic flux density in a normal line direction, half width, and attenuation ratio of the main magnet and the angle between the main magnet and auxiliary magnets are specified, and the magnetic sleeve has specific grooves thereon, and wherein the toner has a volume average particle diameter of from 4.0 to 7.0 ?m, and includes fine particles having a circle equivalent diameter not greater than 2 ?m in an amount not greater than 20% by number.Type: GrantFiled: September 22, 2003Date of Patent: September 20, 2005Assignee: Ricoh Company LimitedInventors: Maiko Kondo, Fumihiro Sasaki, Toshiki Nanya, Shinichiro Yagi, Masami Tomita, Shigeru Emoto, Naohito Shimota, Hiroto Higuchi, Tomoyuki Ichikawa
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Patent number: 6925277Abstract: A developing device of the present invention includes a developing roller including a sleeve and a magnet roller accommodated in the sleeve. The surface of the sleeve s configured such that the center portion, including an image forming range corresponding to the image forming range of an image carrier, in the direction of width perpendicular to the direction of movement of the above has a higher developer conveying ability than opposite end portions outward of the center portion. Opposite ends of the magnetic pole of the magnet roller in the direction of width face the opposite end portions of the sleeve.Type: GrantFiled: June 12, 2003Date of Patent: August 2, 2005Assignee: Ricoh Company, Ltd.Inventor: Kazuyuki Sugihara
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Patent number: 6879800Abstract: A position where a transport amount regulation member is opposed to a developing roller is in an area wherein the magnetic flux density in the tangent line direction becomes 95% or less of the maximum value upstream in the developer transport direction from the position at which the magnetic flux density in the normal direction formed by two magnetic poles on both sides of the transport amount regulation member on the sleeve roller surface of the developing roller becomes 0 gausses and is in an area wherein the magnetic flux density in the normal direction becomes 90% or less of the maximum value of the upstream pole in the developer transport direction.Type: GrantFiled: December 18, 2002Date of Patent: April 12, 2005Assignee: Ricoh Printing Systems, Ltd.Inventors: Hiroyuki Mabuchi, Masayoshi Ishii
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Patent number: 6775505Abstract: The invention relates generally to processes for electrostatic image development, and setpoints that provide uniform image development. In particular, an apparatus and process having a magnetic brush that implements a rotating magnetic core within a shell is disclosed. The process implements one or more of the following optimum setpoints: a range of shell surface speeds that provide uniform toning density, a range of shell surface speeds that prevent toner plate-out, a skive spacing that minimizes sensitivity to variation, a magnetic core speed that minimizes sensitivity to variation, and an imaging member spacing that minimizes sensitivity to variation.Type: GrantFiled: January 17, 2003Date of Patent: August 10, 2004Assignee: NexPress Digital LLCInventors: Eric C. Stelter, Joseph E. Guth, Matthias H. Regelsberger, Edward M. Eck
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Patent number: 6762665Abstract: The object is to provide a magnet roller whereby picture quality can be improved by raising the magnetic flux density of the specified magnetic pole and/or other magnetic poles, and wherein this magnetic pole pattern can be achieved with low cost. In a magnet roller (10) according to the invention that achieves this object, a plurality of magnet pieces (12, 14, 16, 18) are mounted at the periphery of a shaft (20) by joining at joining faces and peaks (32a, 34a, 36a, 38a) of magnetic poles (32, 34, 36, 38) are generated on the lines of extension of joining faces (13, 15, 17, 19) by setting the directions of orientation magnetization (22, 24, 26, 28) of adjacent magnet pieces (12, 14, 16, 18) facing the joining faces (13, 15, 17, 19), the respective joining faces (13, 15, 17, 19) of the plurality of magnet pieces (20) being provided along the roller radial directions.Type: GrantFiled: July 9, 2001Date of Patent: July 13, 2004Assignees: Kaneka Corporation, Tochigi Kaneka CorporationInventors: Masaharu Iwai, Masami Hosokawa
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Patent number: 6733891Abstract: Rolls include a core and a glass outer coating on the core. The glass can be electrically charged and discharged. The outer coatings have smooth finishes and controlled electrical properties. The outer coatings can also provide selected mechanical, chemical and thermal properties. The rolls can be used in various applications in which controlled electrical properties are desired. For example, the rolls can be used as charge donor rolls in electrostatographic imaging apparatus.Type: GrantFiled: May 31, 2000Date of Patent: May 11, 2004Assignee: Xerox CorporationInventors: Christopher D. Blair, Timothy R. Jaskowiak
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Patent number: 6725007Abstract: In a developing assembly having a developer container, a developer-carrying member, a developer layer thickness control member, a magnetic-field formation device and an agitation member, the developer is a two-component developer which contains at least a binder resin, a colorant, an organometallic compound and a wax and has wax-dispersed non-magnetic toner particles with an average particle diameter of from 2 &mgr;m to 10 &mgr;m and a magnetic carrier. The developer-carrying member is a member which has been subjected to surface blasting with spherical particles to have a surface having a ten-point average roughness Rz in a range from D/6 to D/2 where D is the average particle diameter of the magnetic carrier. The magnetic carrier has a magnetization intensity in a range of 8 Am2/kg to 50 Am2/kg in a magnetic field of 7.95775 kA/m.Type: GrantFiled: September 27, 2002Date of Patent: April 20, 2004Assignee: Canon Kabushiki KaishaInventor: Keiko Igarashi
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Publication number: 20040028429Abstract: To provide a development apparatus capable of, by curbing wear between flange members and a magnet roller and easily keeping accuracy of a clearance t between an inner radius surface of a developing sleeve and a circumferential surface of the magnet roller, generating an even magnetic force around the developing sleeve and further providing a liquid lubricant so as to obtain an image with good quality.Type: ApplicationFiled: August 4, 2003Publication date: February 12, 2004Applicant: Canon Kabushiki KaishaInventor: Naoki Matsumaru
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Patent number: 6687476Abstract: A used developer-carrying member having a resin coating layer on a substrate is regenerated through a step of scraping the resin coating layer of the used developer-carrying member to form a developer-carrying member surface having unevenness showing a central line-average roughness Ra of at most 0.8 &mgr;m, and a step of coating the developer-carrying member surface having the unevenness with a coating layer of a resinous composition comprising at least a binder resin and electroconductive fine powder. The regenerated developer-carrying member can be reinstalled in a developing apparatus and subjected to repetitive electrophotographic image forming cycles.Type: GrantFiled: January 14, 2002Date of Patent: February 3, 2004Assignee: Canon Kabushiki KaishaInventors: Yasuhide Goseki, Masayoshi Shimamura, Yasutaka Akashi, Kenji Fujishima, Kazunori Saiki, Satoshi Otake, Naoki Okamoto
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Patent number: 6640076Abstract: A developing roller system used in a developing device. A magnet roller includes a plurality of magnets configured to attract the developer. A developing sleeve is provided outside of the magnet roller and configured to carry and convey a developer while bearing the developer by a magnetic force of the magnet roller. The surface of the developing sleeve is configured such that a transportation capacity of the developer in end portions of the developing sleeve which correspond to a vicinity of ends of the magnet roller is smaller than the transportation capacity of the developer in a central portion of the developing sleeve which corresponds to a central portion of the magnet roller. The developer includes a two-component developer having a toner and a carrier.Type: GrantFiled: December 3, 2001Date of Patent: October 28, 2003Assignee: Ricoh Company, Ltd.Inventor: Takeshi Shintani
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Publication number: 20030170050Abstract: A developing device for developing a latent image formed on an image carrier includes a developer carrier having a developer carrying surface. The developer carrying surface includes a plurality of grooves to carry the developer. Dispersion D (%) in depth of the plurality of grooves is calculated according to an equation, D (%)={(A−B)/2}/C, where A is a maximum depth of the plurality of grooves, B is a minimum depth of the plurality of grooves, and C is an average depth of the plurality of grooves. The dispersion D (%) is at most approximately 30%.Type: ApplicationFiled: February 4, 2003Publication date: September 11, 2003Inventor: Junichi Terai
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Patent number: 6571077Abstract: The invention relates generally to apparatus for electrostatic image development and, in particular, apparatus that implement a magnetic brush with a drum photoconductor. According to an aspect of the invention, a method and apparatus for developing an electrostatic image are provided implementing a drum photoconductor and a magnetic brush contacting the drum photoconductor. The magnetic brush includes a mixture of toner and hard magnetic carriers.Type: GrantFiled: May 16, 2001Date of Patent: May 27, 2003Assignee: Heidelberger Druckmaschinen AGInventors: John R. Thompson, Timothy G. Armstrong, Richard G. Allen, Thomas Hilbert, Christopher S. Garcia
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Publication number: 20030068178Abstract: In a developing assembly having a developer container, a developer-carrying member, a developer layer thickness control member, a magnetic-field formation means and an agitation means, the developer is a two-component developer which contains at least a binder resin, a colorant, an organometallic compound and a wax and has wax-dispersed non-magnetic toner particles with an average particle diameter of from 2 &mgr;m to 10 &mgr;m and a magnetic carrier, and the developer-carrying member has been subjected to surface blasting with spherical particles to have a surface having a ten-point average roughness Rz of from D/6 to D/2 where D is the average particle diameter of the magnetic carrier.Type: ApplicationFiled: September 27, 2002Publication date: April 10, 2003Applicant: Canon Kabushiki KaishaInventor: Keiko Igarashi
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Patent number: 6546222Abstract: A developing apparatus for an image forming apparatus forms an electrostatic latent image corresponding to an image information signal on an image bearing member. The developing apparatus includes a developer carrying member which bears and conveys a two-component developer containing a non-magnetic toner and a magnetic carrier for forming a toner image by developing the electrostatic latent image formed on the image bearing member. Convexities and concavities are formed on a surface of the developer carrying member. An average peak-to-peak spacing (Sm) of the convexities and concavities is set at ⅓ to 6 times of a weight-average particle diameter of the magnetic carrier (D) (D/3≦Sm≦6*D). An average roughness at ten points (Rz) on the surface of the developer carrying member is set at {fraction (1/10)} to ½ times of the weight-average particle diameter of the magnetic carrier. A number of concavities which are 1 &mgr;m to 10 &mgr;m wide and 0.Type: GrantFiled: June 6, 2001Date of Patent: April 8, 2003Assignee: Canon Kabushiki KaishaInventors: Yuji Sakemi, Keiko Igarashi, Tomoyuki Sakamaki
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Publication number: 20030054275Abstract: A magnetic toner contains, as a magnetic powder, magnetic iron oxide having an octahedral particle shape and an average particle diameter of 0.21 &mgr;m or larger and containing 18% or more by weight of FeO. The magnetic toner is so prepared as to have a bulk density A (g/cm3) and a magnetic powder content B (% by weight) that fulfill the formulae 0.8≦A/B×100≦1.6 and 35≦B≦50. This alleviates the reddishness of images produced with the magnetic toner, and alleviates the disturbance of a thin toner layer on a developing sleeve and thus the fogging resulting therefrom.Type: ApplicationFiled: August 15, 2002Publication date: March 20, 2003Inventors: Hiroko Sugimoto, Takashi Nagai, Toru Takatsuna, Seiji Kikushima
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Patent number: 6526247Abstract: The invention relates generally to processes for electrostatic image development, and setpoints that provide uniform image development. In particular, an apparatus and process having a magnetic brush that implements hard carriers and a rotating magnetic core within a shell is disclosed. The process implements one or more of the following optimum setpoints: a range of shell surface speeds that provide uniform toning density, a range of shell surface speeds that prevent toner plate-out, a skive spacing that minimizes sensitivity to variation, a magnetic core speed that minimizes sensitivity to variation, and an imaging member spacing that minimizes sensitivity to variation.Type: GrantFiled: May 15, 2001Date of Patent: February 25, 2003Assignee: Heidelberger Druckmaschinen AGInventors: Eric C. Stelter, Joseph E. Guth, Matthias H. Regelsberger, Edward M. Eck
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Patent number: 6512910Abstract: The developing sleeve comprising a metal substrate and a ceramic-dispersion-plated metal film containing ceramic particles dispersed therein and formed on a surface of the metal substrate. The developing apparatus is equipped with this developing sleeve and the image forming apparatus has this developing apparatus.Type: GrantFiled: March 27, 2001Date of Patent: January 28, 2003Assignee: Toshiba Tec Kabushiki KaishaInventors: Shinji Aoki, Takao Izumi
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Patent number: 6512908Abstract: A developing apparatus is provided which includes a hollow cylindrical sleeve which is rotationally driven and a magnetic shaft which is rotationally driven inside the sleeve. The magnetic shaft causes magnetic toner to adhere to a peripheral surface of the sleeve by magnetic force. The magnetic toner adhering to the peripheral surface is supplied to a developing position by rotation of the sleeve and adheres to an electrostatic latent image formed on the surface of a photosensitive body. The center of rotation of the magnetic shaft is deviated from the center of rotation of the sleeve nearer to the photosensitive drum, and frontward along the direction of rotation of the sleeve from a line connecting the center of rotation of the sleeve and the center of rotation of the photosensitive body.Type: GrantFiled: June 25, 2001Date of Patent: January 28, 2003Assignee: Toshiba Tec Kabushiki KaishaInventor: Hiromichi Mitamura
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Patent number: 6503674Abstract: Member for a printer, a fax machine, a copier or a toner cartridge, in which said member has a face in contact with toner particles, said face being provided with a top layer in contact with toner particles, said top layer comprising substantially spherical particles with a Mohs hardness of more than 3 or equal to 3 and an average particle size lower than 100 &mgr;m.Type: GrantFiled: April 24, 2001Date of Patent: January 7, 2003Assignee: CF TechnologiesInventor: Gino Sirejacob
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Patent number: 6480691Abstract: In a developing roll, grooves of a length direction of a developing roll are formed on a surface of the developing roll on conditions that a ratio of a groove depth to a groove width is set to one or more and a ratio of a groove pitch to a groove width is set to two or more and a groove depth is set to three times or more a carrier particle size, and a magnetic pole of the inside of the developing roll is provided in a position of a doctor blade for regulating the amount of carriage of a developer roll, and further a magnetic force on the surface of the developing roll of the position of the doctor blade is set to 0.06 T or less.Type: GrantFiled: May 30, 2001Date of Patent: November 12, 2002Assignee: Hitachi Koki Co., Ltd.Inventor: Hisao Okada
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Patent number: 6430384Abstract: A developer-carrying member has a conductive substrate and a conductive resin coating layer provided on the surface of the conductive substrate. The conductive resin coating layer has a resin in which graphite particles or molybdenum disulfide particles stand dispersed, and the particles are uncovered to the surface of the conductive resin coating layer at a specific degree of uncovering. Also disclosed are a process for producing the developer-carrying member, a developing apparatus having the developer-carrying member, and an image-forming apparatus having the developing apparatus.Type: GrantFiled: December 26, 2000Date of Patent: August 6, 2002Assignee: Canon Kabushiki KaishaInventors: Masayuki Hama, Kazushige Nishiyama
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Publication number: 20020067933Abstract: A developing roller used in a developing device includes a magnet roller including a plurality of magnets, and a developing sleeve provided outside of the magnet roller to carry and convey a developer while bearing the developer by a magnet force of the magnet roller. The surface of the developing sleeve is configured such that a transportation capacity of the developer in end portions of the developing sleeve which correspond to a vicinity of ends of the magnet roller is smaller than the transportation capacity of the developer in a central portion of the developing sleeve which corresponds to a central portion of the magnet roller.Type: ApplicationFiled: December 3, 2001Publication date: June 6, 2002Inventor: Takeshi Shintani
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Patent number: 6393242Abstract: A metal pipe excellent in dimensional accuracy, which is suitably used for a development sleeve, a fixing roller, or a photosensitive drum for electrophotographic apparatuses or electrostatic recording apparatuses such as copying machines or printers, or a base body thereof. The metal pipe is produced by cutting a long-sized metal pipe body into a specific length, to obtain a raw pipe, and adjusting the surface state and the dimensional accuracy of the raw pipe by cutting and polishing the outer peripheral surface of the raw pipe, wherein the raw pipe has an inner stress of 20 N/mm2 or less.Type: GrantFiled: May 7, 2001Date of Patent: May 21, 2002Assignee: Bridgestone CorporationInventors: Morihiro Miyashita, Yuuichi Hamaguchi
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Patent number: 6391511Abstract: A developing apparatus has a developer container for holding a developer, a developer carrying member for carrying a positively chargeable developer held in the developer container and transporting the developer to a developing zone and a developer layer-thickness regulating member for regulating the thickness of a positively chargeable developer layer to be formed on the developer carrying member. The developer carrying member has at least a substrate and a resin coat layer formed of a resin composition on the surface of the substrate. The resin composition contains at least (I) a binder resin, (II) a conductive fine powder, (III) spherical particles having a number-average particle diameter of from 0.3 &mgr;m to 30 &mgr;m and (IV) a quaternary ammonium salt compound which is positively chargeable to iron powder.Type: GrantFiled: April 13, 1999Date of Patent: May 21, 2002Assignee: Canon Kabushiki KaishaInventors: Naoki Okamoto, Yasuhide Goseki, Masayoshi Shimamura, Kenji Fujishima, Kazunori Saiki, Satoshi Otake
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Patent number: 6379858Abstract: A honing means produces sonic waves that suspend and propel a honing medium against a surface of a substrate. The honing medium impinges on the surface of the substrate and alters the substrate's surface roughness. The substrate and the honing means are positioned relative to each other to ensure substantial surface roughness uniformity.Type: GrantFiled: August 14, 2000Date of Patent: April 30, 2002Assignee: Xerox CorporationInventors: Philip G. Perry, Gene W. O'Dell, William G. Herbert, Alexander A. Antonelli
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Patent number: 6376088Abstract: A method of electroforming a non-ferromagnetic substrate for use in an electrostatographic imaging member includes electroforming a non-ferromagnetic substrate of nickel and one of phosphorus, tin and copper. The substrate can be cylindrical shaped and have a substantially constant inner diameter and outer diameter along a length of the substrate. The substrates can be used in various electrostatographic imaging members including electrographic and electrophotographic imaging members. The methods of this invention can provide seamless imaging members such as photoreceptors that can be used in apparatus that include magnetic developer systems, without adversely interacting with magnetic brushes and magnetic toners.Type: GrantFiled: November 24, 1999Date of Patent: April 23, 2002Assignee: Xerox CorporationInventors: William G. Herbert, James E. McNamara, Gary J. Maier
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Publication number: 20020031376Abstract: The invention relates generally to apparatus for electrostatic image development and, in particular, apparatus that implement a magnetic brush with a drum photoconductor. According to an aspect of the invention, a method and apparatus for developing an electrostatic image are provided implementing a drum photoconductor and a magnetic brush contacting the photoconductor. The magnet brush comprises a mixture of toner and hard magnetic carriers.Type: ApplicationFiled: May 16, 2001Publication date: March 14, 2002Inventors: John R. Thompson, Timothy G. Armstrong, Richard G. Allen, Thomas Hilbert, Christopher S. Garcia
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Publication number: 20020028094Abstract: A developing apparatus for an image forming apparatus has means for forming an electrostatic latent image corresponding to an image information signal on an image bearing member having: a developer carrying member which bears and conveys a two-component developer containing a non-magnetic toner and a magnetic carrier for forming a toner image by developing the electrostatic latent image on the image bearing member. The convexities and concavities are formed on a surface of the developer carrying member, and an average peak-to-peak spacing (Sm) of the convexities and concavities is set at ⅓ to 6 times of a weight-average particle diameter of said magnetic carrier (D) (D/3≦Sm≦6*D), average roughness at ten points (Rz) on the surface of the developer carrying member is set at {fraction (1/10)} to ½ times of the weight-average particle diameter of the magnetic carrier and a number of concavities which are 1 &mgr;m to 10 &mgr;m wide and 0.Type: ApplicationFiled: September 21, 2001Publication date: March 7, 2002Inventors: Yuji Sakemi, Keiko Igarashi, Tomoyuki Sakamaki
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Publication number: 20020025198Abstract: A developing apparatus comprises a hollow cylindrical sleeve which is rotationally driven and a magnetic shaft which is rotationally driven inside the sleeve. The magnetic shaft causes the magnetic toner to adhere to the peripheral surface of the sleeve by the magnetic force. The magnetic toner adhering to the peripheral surface is supplied to the developing position by rotation of the sleeve and adheres to the electrostatic latent image formed on the surface of a photosensitive body. The center of rotation of the magnetic shaft is deviated from the center of rotation of the sleeve nearer to the photosensitive drum, and frontward along the direction of rotation of the sleeve from a line connecting the center of rotation of the sleeve and the center of rotation of the photosensitive body.Type: ApplicationFiled: June 25, 2001Publication date: February 28, 2002Applicant: Toshiba Tec Kabushiki KaishaInventor: Hiromichi Mitamura
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Patent number: 6335066Abstract: A disposal cartridge for use in an image forming apparatus includes a sheet and a roller. An area of the sheet is at least equal to an area of the entire circumferential surface of the roller. The sheet is detachably bonded to an entire circumferential surface of the roller. The roller attracts toner and is detachably and rotatably mounted on the disposal cartridge.Type: GrantFiled: December 29, 1998Date of Patent: January 1, 2002Assignee: Ricoh Company, Ltd.Inventor: Shigemi Kanda