Patents by Inventor Akira Terakado
Akira Terakado has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6754464Abstract: In order to provide a miniature full-color recorder having an excellent color reproducibility and to provide a full-color recorder having a wider color reproduction range beyond the range of subtraction color mixing of three primary colors, first and second potential split developing processes are continuously arranged for one recording medium.Type: GrantFiled: April 17, 2002Date of Patent: June 22, 2004Assignee: Hitachi Koki Co., Ltd.Inventors: Teruaki Mitsuya, Yasuo Kikuchi, Akira Terakado, Kazuo Sakaki, Shinya Kobayashi, Akira Arimoto
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Publication number: 20020150409Abstract: In order to provide a miniature full-color recorder excellent in color reproducibility and provides a full-color recorder having a wider color reproduction range beyond the range of subtraction color mixing of the three primary colors, the first and second potential split developing processes are continuously arranged for one recording medium.Type: ApplicationFiled: April 17, 2002Publication date: October 17, 2002Inventors: Teruaki Mitsuya, Yasuo Kikuchi, Akira Terakado, Kazuo Sakaki, Shinya Kobayashi, Akira Arimoto
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Patent number: 6445903Abstract: In an image forming apparatus, a length of a transporting passage between an induction roller pair and a reversal roller pair and a length of a transporting passage between the reversal roller pair and a feed roller pair are respectively set smaller than the smallest length in the transporting direction of a sheet used in an image forming apparatus. A time till the rotation of the reversal roller pair is switched to the forward rotation after a rear end of the sheet having a length in the transporting passage of 8.5 inch after reversal has passed through the reversal roller pair can be set shorter than a time when a leading end of a succeeding sheet inducted into a pull-in passage reaches the reversal roller pair.Type: GrantFiled: February 26, 2001Date of Patent: September 3, 2002Assignee: Hitachi Koki Co., Ltd.Inventors: Yasushi Hashimoto, Akira Terakado, Masato Miwa
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Publication number: 20010031155Abstract: In an image forming apparatus, a length of a transporting passage between an induction roller pair and a reversal roller pair and a length of a transporting passage between the reversal roller pair and a feed roller pair are respectively set smaller than the smallest length in the transporting direction of a sheet used in an image forming apparatus. A time till the rotation of the reversal roller pair is switched to the forward rotation after a rear end of the sheet having a length in the transporting passage of 8.5 inch after reversal has passed through the reversal roller pair can be set shorter than a time when a leading end of a succeeding sheet inducted into a pull-in passage reaches the reversal roller pair.Type: ApplicationFiled: February 26, 2001Publication date: October 18, 2001Inventors: Yasushi Hashimoto, Akira Terakado, Masato Miwa
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Patent number: 6227540Abstract: A sheet carrying apparatus (2) includes: a sheet receiving means (6, 16) for receiving a sheet ejected from a sheet output device (1); a first carrying path (7) for guiding the sheet; a second carrying path (8) branched out of the first carrying path; a carrying path switching means (9) provided in a branching portion between the first and second carrying paths; a first receiving device attachment portion (11) for detachably holding a first receiving device (3) for receiving the sheet ejected from the first carrying path; and a second receiving device attachment portion (12) for detachably holding a second receiving device (4) for receiving the sheet ejected from the second carrying path.Type: GrantFiled: May 5, 1999Date of Patent: May 8, 2001Assignee: Hitachi Koki Co., Ltd.Inventors: Takashi Nakamura, Akira Terakado, Yasushi Hashimoto, Tatsuo Matsuda, Tatsuya Shiraishi, Jun Ogino
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Patent number: 5240237Abstract: An air flow path switching device for a printing apparatus includes a sheet hopper which holds a plurality of sheets, a sheet switchback device for inverting the sheets so that both sides of the sheets can be printed on, sheet pickup devices associated, respectively, with the sheet hopper and the sheet switchback device for picking up sheets, and a blower device for supplying pressurized suction and discharge air to the sheet pickup devices. An air flow resistance existing in the sheet switchback device, when the sheet pickup device associated with the sheet hopper is connected to the blower, and an air flow resistance existing in the sheet switchback device, when the sheet pickup device associated with the sheet hopper is disconnected from the blower, are substantially equivalent.Type: GrantFiled: November 8, 1991Date of Patent: August 31, 1993Assignee: Hitachi Koki Co., Ltd.Inventors: Makoto Nakura, Akira Terakado, Yoshihiro Gunji
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Patent number: 5206784Abstract: An electrophotographic charger of the type in which a plurality of corona wires extend in the axial direction adjacent to and separated from the surface of a photosensitive drum in order to charge the surface. A plate-like etching grid is interposed between the corona wires and the drum to ensure the charge is uniformly placed on the drum. The grid is divided into a number of individual removable grids so that the distance between each grid and the adjacent corona wire, and the distance between each grid and the drum surface is substantially uniform.Type: GrantFiled: February 22, 1990Date of Patent: April 27, 1993Assignee: Hitachi Koki Co., Ltd.Inventors: Yasushi Kimiwada, Akira Terakado, Minoru Seino, Yasushi Hashimoto, Koji Kato, Isamu Komatsu
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Patent number: 5023464Abstract: In a heat roll consisting of a mandrel and a surface layer, this invention comprises a fixing apparatus and a recording apparatus, wherein a thickness of the surface layer is formed not exceeding the thickness determined by a square root of the product of a heat diffusion rate of the surface material and a nip time required for a form to pass a nip zone, and a thickness of the mandrel is formed not less than the thickness determined by a square root of the product of a heat diffusion rate of the mandrel material and a one rotational period of the mandrel. Since the surface layer and the mandrel are so specified for the thickness as mentioned, a quantity of heat flowing from the mandrel into the surface layer multiplies, and thus a high fixing strength is obtainable. The fixing apparatus and the recording apparatus are provided further with a cleaning device high in cleaning capacity.Type: GrantFiled: September 19, 1990Date of Patent: June 11, 1991Assignees: Hitachi, Ltd., Hitachi Koki Co., Ltd.Inventors: Teruaki Mitsuya, Shigetaka Fujiwara, Michio Endou, Akira Terakado
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Patent number: 4998143Abstract: An electrophotographic image transfer member of bias-roller transfer type is capable of pressing a recording medium into contact with a toner image. The image transfer member has a rotatable supporting member, an elastic member provided around the supporting member, and a conductive resin layer formed on the surface of the elastic member. An electrical path is formed to enable supply of a bias voltage to the conductive resin layer. An image transfer device has the image transfer member and a cleaner capable of removing toner from the image transfer member upon frictional contact therewith. An electrophotographic apparatus has an image transfer member for bringing the recording medium into pressure contact with the toner image and for applying the bias voltage, and a mechanism for bringing the image transfer member towards and away from the photosensitive member in response to a signal indicative of execution of one of several basic steps of the electrophotographic process.Type: GrantFiled: September 15, 1989Date of Patent: March 5, 1991Assignees: Hitachi, Ltd., Hitachi Koki Co., Ltd.Inventors: Takao Kumasaka, Yuzuru Simazaki, Akira Terakado, Yasuro Hori
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Patent number: 4926216Abstract: A feeder for a electrophotographic printer to feed photo-sensitive paper onto the drum of the printer. Sheets of photo-sensitive paper are adhered to release paper. The sheets are separated from the release paper by rolling the sheets adhered to the release paper over a positioning roll, where separation occurs, and rolling the photo-sensitive sheets onto the drum and the release paper onto a take-up roll. The sheets are clamped at their front end to the drum the drum is rotated and the sheets are clamped at their rear end to the drum. The take-up roll is rotated by the driving force of a stepping motor and the frequency of the driving force is controlled to coincide with the rotational speed of the drum.Type: GrantFiled: March 20, 1989Date of Patent: May 15, 1990Assignee: Hitachi Koki CompanyInventors: Yasushi Hashimoto, Yasuyuki Tsuji, Akira Terakado
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Patent number: 4774545Abstract: Cut paper electrophotographic printers with continuous paper feed mechanisms including a pickup roll, a photosensitive drum, a charging unit, an optical unit, a host controller, a developing unit, a transfer unit and fixing rolls. Further included are first and second branch passages for providing alternate feeding paths to continuously feed cut paper sheets to the photosensitive drum.Type: GrantFiled: May 26, 1987Date of Patent: September 27, 1988Assignee: Hitachi Koki Company, LimitedInventors: Yasuyuki Tsuji, Akira Terakado