Patents Examined by Jane Lau
  • Patent number: 4835572
    Abstract: An image forming apparatus is provided which includes a document set section, a document size detecting device, a medium set section, a device for picking up the size of the medium, a medium feed device, and an image forming device for forming an image of a document in the document set section on the medium of an image forming location. The apparatus further includes an auto magnification designating device for generating data to designate an image forming magnification according to data representative of the size of the medium picked up by the pick up device by using the document size as detected by the document size detecting device. Further, a manual magnification designating device is providing for manually designating a desired magnification for image forming.
    Type: Grant
    Filed: October 29, 1987
    Date of Patent: May 30, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Fumito Ide
  • Patent number: 4829337
    Abstract: A cleaning device for removing residual developer particles from a photoconductive element, such as a photoconductive belt, comprises a cleaning sleeve having a length substantially equal to the width of the photoconductive element. The cleaning sleeve includes a thin screen portion having apertures therein. The screen portion is maintained in contact with the photoconductive element. A biasing voltage is applied to the cleaning sleeve. Developer particles pass through the apertures in the screen portion. An auger is located in the interior of the cleaning sleeve. The auger transports the collected developer particles out of the cleaning sleeve where the particles may be either recycled or discarded.
    Type: Grant
    Filed: April 1, 1987
    Date of Patent: May 9, 1989
    Assignee: Kentek Information Systems, Inc.
    Inventors: Kensuke Fukae, Shozo Kaieda
  • Patent number: 4827306
    Abstract: A discharging apparatus for use in a copying machine for discharging the photoreceptor layer laminated on a drum includes a short wavelength light source for producing a light having a wavelength shorter than 6000 angstrom, and a long wavelength light source for producing a light having a wavelength longer than 6200 angstrom. A control circuit is provided for controlling both light sources such that both light sources are turned on during at least one complete rotation of the drum before an exposure of a light image on the photoreceptor layer.
    Type: Grant
    Filed: October 17, 1985
    Date of Patent: May 2, 1989
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshiharu Tsujimoto, Hiroshi Kinashi, Yuhi Yui, Teruhiko Noguchi, Itaru Kawabata
  • Patent number: 4827310
    Abstract: Disclosed herein is a device for setting a copying magnification in an electrophotographic copying apparatus. The device comprises means for manually inputting a numerical value, a plurality of memory means, selection key means for selecting one from the plurality of memory means and control means for memorizing a numerical value input by the numerical value input means in said one of memory means selected by the selection key means, so that the copying apparatus operates to set a copying magnification by a numerical value memorized in said one of memory means.
    Type: Grant
    Filed: November 19, 1986
    Date of Patent: May 2, 1989
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Kenji Shibazaki, Yutaka Irie, Masazumi Ito, Tomoji Murata
  • Patent number: 4825244
    Abstract: A development station for an eletrostatographic apparatus has an elongate sump for a two-component developer material. A feed screw drives developer material along a tube and through openings in the tube into the sump. A ribbon blender coaxially positioned wtih respect to the tube mixes the developer material, delivers it to a developer applicator for transfer to an electrostatic image, and returns the remaining developer material to the other end of the sump for mixture with fresh toner particles.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: April 25, 1989
    Assignee: Eastman Kodak Company
    Inventor: Edwin A. Hediger
  • Patent number: 4819030
    Abstract: A cleaning device adapted to be detachably mounted on an electrostatic printing apparatus etc. for removing by means of a cleaning blade etc. extra toner left on a photosensitive member of the printing apparatus for storage in a toner recovery tank is disclosed, in which the cleaning blade etc. is moved to seal an opening of the toner recovery tank when the cleaning device is detached from the photosensitive member.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: April 4, 1989
    Assignee: Ricoh Company, Ltd.
    Inventor: Tomobumi Shibano
  • Patent number: 4819020
    Abstract: A fixing roller of the present invention comprising at least an electrically conductive core member and a PFA dispersion layer formed from a polytetrafluoro ethylene perfluoro alkoxy ethylene co-polymer (PFA resin) with carbon black or like conductive material dispersed therein by means of a dispersing agent. A roller of this construction effectively prevents triboelectrically-induced offset caused by the electrostatic attraction of the toner by a surface charge on the outer peripheral surface of the roller. Since the release properties of said roller are superior, offset caused by thermal adhesion of the toner to the roller is also effectively prevented.
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: April 4, 1989
    Assignee: Minolta Camera Kabushika Kaisha
    Inventors: Moriyoshi Matsushiro, Etsuaki Urano
  • Patent number: 4816870
    Abstract: One or each of a plurality of developing units of a magnetic brush type developing device includes a shield plate which is angularly movable in a space between a cylindrical sleeve, which constitutes a developing roller, and a magnetic body so as to shield a part of magnetic fields which are developed by the magnetic body. The shield plate moves in a reciprocal motion only between a first position corresponding to that where the sleeve scoops a developer and a second position where the developer is separated and not to a position where a main pole magnet for development of the magnetic body is disposed, so that a magnetic field developed by the main pole magnet is not shielded. A member for supporting the shield plate is interposed between the magnetic body and the shield plate.
    Type: Grant
    Filed: November 27, 1987
    Date of Patent: March 28, 1989
    Assignee: Ricoh Company, Ltd.
    Inventor: Masanori Nagayama
  • Patent number: 4814815
    Abstract: An image-generating device for an electrophotographic copying machine; is provided with a white-color reflection plate at a specific position on a component part supporting the light source that is used for illuminating the original document in order to prevent charge from being generated at the position where the separation belt comes into contact with the photoreceptor, while the device sufficiently cancels charge by effectively applying a tapered tip part of the white-color reflection plate without causing a black streak to be generated.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: March 21, 1989
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Kiyoshi Shibata, Kikunosuke Tsuji
  • Patent number: 4812881
    Abstract: An automatic image-density control system for photo-copying the page-to-page content of an open book, in which optimum values (of exposure or development bias) needed for precisely copying the page-to-page content are initially established by performing either continuous pre-scanning of both pages of an open book or pre-scanning of the second page after completing photo-copying of the first page, and then, based on the optimum values thus established in conjunction with the first page content, photo-copying operation for the first page content is executed, and then, based on the optimum values established for the second-page content, photo-copying operation is sequentially executed for the second-page content.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: March 14, 1989
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Hidechika Kumamoto, Satoshi Kuroyanagi, Setsuo Hori
  • Patent number: 4812873
    Abstract: A heat fixing unit in an electrophotographic copying apparatus is disclosed. The heat fixing unit comprises a heat fixing roller with a heater, a pressure roller with a plurality of fibers, and driven ring components disposed on the ends of the pressure roller for adjusting the contact amount between the heat fixing roller and the pressure roller. The heat fixing unit offers a less warming up time and a better paper delivery performance, and requires less material cost.The heat fixing unit in an electrophotographic copying apparatus may employ a fixed type or a rotary type curing unit for raising the plurality of fibers.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: March 14, 1989
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Sanji Inagaki, Hiroshi Fukao, Tetsuya Yamada, Etsuaki Urano, Yoshihiro Hattori
  • Patent number: 4811049
    Abstract: There is disclosed an automatic original feeder of an improved structure capable of functioning in a first mode in which the original is ejected after exposure and in a second mode in which the original is reversed between exposures of both sides before ejection.
    Type: Grant
    Filed: July 18, 1984
    Date of Patent: March 7, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takeshi Honjo, Naomi Takahata
  • Patent number: 4809035
    Abstract: Substantial amounts of non-magnetic (zinc stearate) particles are removed from a supply of single component magnetic toner descending from a toner hopper before the toner reaches the image drum of an ion deposition printer. Such separation is accomplished by providing an unwanted particle chamber extending along substantially the entire width of the toner unit housing adjacent and generally below the toner hopper outlet. A blower is effective through an air manifold assembly mounted on the toner unit housing to draw the unwanted particles from such chamber.
    Type: Grant
    Filed: July 7, 1987
    Date of Patent: February 28, 1989
    Inventor: Joseph M. Allen, Jr.
  • Patent number: 4809041
    Abstract: An image processing apparatus includes: a section for setting an image processing mode; a memory for storing a processing mode necessary for processing an image and set by the operating section as an operating mode, the memory being capable of storing a plurality of such modes; an input section for inputting a command for reading the modes stored in the memory; a controller responsive to the command from the input section for reading a plurality of operating modes stored in the memory in a predetermined order; and a process for performing an image processing based on a mode read by the controller.
    Type: Grant
    Filed: February 6, 1987
    Date of Patent: February 28, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masahiro Funada
  • Patent number: 4809034
    Abstract: A developing device includes a developing sleeve which is provided with a plurality of magnets so as to transport a two-component developer composed of toner and carrier to a developing region where the developing sleeve and a member bearing an electrostatic latent image confront each other, a toner reservoir, a toner supply roller for supplying the toner to the developing sleeve, which is disposed at an end portion of the toner reservoir so as to be brought into contact with the toner in the toner reservoir, a rotary member which is rotatably provided in the toner reservoir so as to be rotated in contact with the toner supply roller and a charge erasing member for erasing electric charge of electrically charged toner transported to the toner reservoir by the toner supply roller.
    Type: Grant
    Filed: May 19, 1987
    Date of Patent: February 28, 1989
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Hiroshi Murasaki, Hiroshi Mizuno, Akihito Ikegawa, Kouichi Etou
  • Patent number: 4809036
    Abstract: A developing apparatus is disclosed which includes a rotatable development sleeve which carries a non-magnetic one-constituent toner on a surface thereof. When the development sleeve rotates, the toner thereon is transferred to an electrostatic latent image, an elastic blade being urged against the surface of the development sleeve, to ensure that the layer of toner thereon is of uniform thickness. The interior of the development sleeve has a ribbed structure which provides additional structural rigidity.
    Type: Grant
    Filed: October 19, 1987
    Date of Patent: February 28, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mitsuo Yamashita, Shinji Nakagawa
  • Patent number: 4806992
    Abstract: In a developing apparatus for developing an electrostatic-latent image by applying a charged developer to the electrostatic-latent image formed on a surface of an image carrier, a housing which stores the developer has a developing roller for feeding the developer therefrom to a developing position. A developer supply roller for supplying a triboelectrically charged developer is in rolling contact with the developer roller. The developer supply roller has a conductive material, and is rotated while electrostatically holding a developer so as to charge it by friction.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: February 21, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Sachiko Yasuda, Minoru Yoshida, Tomoyuki Asada, Hideo Mukai
  • Patent number: 4806989
    Abstract: The present invention provides an optical correction device capable of correcting an exposure distribution so as to be flat at an image receiving surface such as a photoreceptor of copying machine, in spite of varying a projection magnification of original image on the image receiving surface. Additionally, the optical correction device can correct an exposure amount on the image receiving surface so as to be substantially same level throughout all available magnifications.
    Type: Grant
    Filed: May 6, 1987
    Date of Patent: February 21, 1989
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Taku Saito, Yozo Fujii
  • Patent number: 4806991
    Abstract: A reproduction apparatus has a flexible photoconductor that is moved along an endless path and past a development station for developing latent images on one surface of the photoconductor. A back-up roller is adjacent the other surface of the photoconductor. A mechanism urges the roller against the photoconductor to move it toward the station in response to insertion of the station into the reproduction apparatus. The mechanism has arms alongside the path of the photoconductor that are engageable with stops on the station to precisely locate the roller, and thus the photoconductor, relative to the station.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: February 21, 1989
    Assignee: Eastman Kodak Company
    Inventor: Vladimir S. Guslits
  • Patent number: 4805973
    Abstract: In a method of recording a continuous tone image by controlling a drive current for a semiconductor laser in accordance with image density signal and modulating the intensity of a laser beam emitted by the semiconductor laser, laser beams emitted by a plurality of semiconductor lasers which respectively emit laser beams of wavelength ranges with regard to the spectral sensitivity of the photosensitive material. The photosensitive material is scanned by a coalesced laser beam, and the drive current of the respective semiconductor lasers is controlled.
    Type: Grant
    Filed: April 2, 1986
    Date of Patent: February 21, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Hideo Watanabe