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61. 发明专利

JPS572064A DEVELOPING AND TRANSFER METHOD IN ELECTROPHOTOGRAPHY SYSTEM 失效
公开(公告)号：JPS572064A
公开(公告)日：1982-01-07
申请号：JP7579680
申请日：1980-06-05
申请人： RICOH KK
发明人： SUZUKI HIROHARU , ENOKI SHIGEKAZU , KANEKO TOSHIO , KOYAMA HAJIME , AKUTSU HIDEKAZU
IPC分类号： G03G15/06 , G03G13/09 , G03G15/09 , G03G15/16
摘要： PURPOSE:To obtain a copied picture having a high quality by use of ordinary paper, by using a magnetic toner by which dispersion of iron powder contained in toner particles is not isotropic and also electric resistance is greatly varied depending on a direction. CONSTITUTION:In case of using a magnetic toner T by which the particle size of iron powder FO is comparatively large and its dispersion is not isotropic, the electric resistance becomes small in the direction of B and large in the direction of A, due to deviation of dispersion of the iron powder FO. Therefore, in case of charging, when voltage is applied to a sleeve 22 and a doctor 24, a conductive path having low resistance is formed, charge passes through this conductive path, is injected into each particle easily, and stabilized charging is executed. In case of development, electric force by an electrostatic latent image operates on a toner, unified directional properties of a toner on the sleeve 22 are deteriorated. Accordingly, when a visible image is transferred, a direction which is large in resistance of toner particles is applied. That is to say, this toner operates as that of low resistance for development, and that of high resistance for transfer. In this way, even when ordinary paper is used, a copied image having a high quality can be obtained.

62. 发明专利

JPS56161552A DEVELOPER FOR ELECTROSTATIC LATENT IMAGE 失效
公开(公告)号：JPS56161552A
公开(公告)日：1981-12-11
申请号：JP6569280
申请日：1980-05-16
申请人： RICOH KK
发明人： KAWABATA TOSHIYASU , NOBORISAKA HACHIROU , TAKATSUGI MASAKI , KANEKO TOSHIO , MOCHIZUKI NOBUO
IPC分类号： G03G9/08 , G03G9/097
摘要： PURPOSE:To obtain a developer having superior developing and transferring properties and not causing whitening and ground staining by using a magnetic toner with high electric resistance contg. fine magnetic powder, electrically conductive magnetic particles smaller than the toner in volume average particle size and a specified fine powder as principal components. CONSTITUTION:A magnetic toner 5a contg. fine magnetic powder of magnetite, etc. and having >=10 OMEGAcm volume electric resistivity and 5-20mum volume average particle size is mixed with electrically conductive magnetic particles 5b 1/5-4/5 time as large as the toner 5a in volume average particle size and having OMEGAcm volume electric resistivity in (2-40):(98-60)wt. ratio. To the mixture is further added fine powder of Al2O3, SiO2 or other oxide having

63. 发明专利

JPS56104340A ELECTROPHOTOGRAPHIC METHOD 失效
公开(公告)号：JPS56104340A
公开(公告)日：1981-08-20
申请号：JP718680
申请日：1980-01-24
申请人： RICOH KK
发明人： ENOKI SHIGEKAZU , SUZUKI HIROHARU , KANEKO TOSHIO
IPC分类号： G03G9/08 , G03G9/083 , G03G13/16 , G03G15/09
摘要： PURPOSE:To enable a toner image to be transferred to a plain paper without weakening toner charge, by using a one-component type magnetic toner of particle diameter in a specified range, forming conductive paths between a developing sleeve and a photoreceptor, and injecting charge reverse in polarity to an electrostatic latent image to the toner. CONSTITUTION:A magnetic material having 0.5-5mum average particle diameter amounting to 30-70wt% of the total raw material of a toner containing a binder resin is heat-melted and cooled, then pulverized to give a one-component type toner having 8-18mum average particle diameter and 1.8-2.2 true specific density. Obtained toner particle T have magnetic grains larger than conventional ones, and forms a conductive path in the direction X-X, but toner particle T functions as an insulating material in the direction Y-Y due to larger spaces between magnetic grains 11. As a result, a few toner particles form a conductive path between photoreceptor 2 and grounded developing sleeve 6 surrounding fixed magnets 9, and toner T1 is given positive charge reverse to electrostatic negative charge on photoreceptor 2, thus permitting toner T1 to form a visible image by toner T2 and then, toner T2 to form a transferred toner image of toner T3 by applying an electric field to transfer paper S from the backside.

64. 发明专利

JPS5337428A MANUFACTURE OF ELECTROPHOTOGRAPHIC RECORDING PAPER 失效
公开(公告)号：JPS5337428A
公开(公告)日：1978-04-06
申请号：JP11171376
申请日：1976-09-20
申请人： RICOH KK
发明人： KANEKO TOSHIO , YASUMORI AKIYOSHI , SUZUKI KOUICHIROU
IPC分类号： G03G5/05 , G03G5/00
摘要： PURPOSE:To produce fine foam cells in a photoconductor layer by heat forming and reduce the wieght of recording paper as well as improve image lightness.

65. 发明专利

JPS52152230A ELECTROPHOTOGRAPHIC RECORDING MATERIAL 失效
公开(公告)号：JPS52152230A
公开(公告)日：1977-12-17
申请号：JP6869276
申请日：1976-06-14
申请人： RICOH KK
发明人： SUZUKI KOUICHIROU , KANEKO TOSHIO , IGAWA TAKAO , YASUMORI AKIYOSHI , ABE MICHIHARU
IPC分类号： G03G5/14 , G03G5/10
摘要： PURPOSE:To enable the thickness of the photoconductor layer and the wt. of a recording material used for wet type electrophotography to be reduced, and yet, a clear image to be formed, by providing a specified layer between an electrically conductive support and a photoconductor layer.

66. 发明专利

JPH09146402A FIXING DEVICE 失效
公开(公告)号：JPH09146402A
公开(公告)日：1997-06-06
申请号：JP32372995
申请日：1995-11-18
申请人： RICOH KK
发明人： AKAFUJI MASAHIKO , KANEKO TOSHIO , KUROTAKA SHIGEO , MOTOHASHI TAKESHI , KIMURA NORIYUKI , AOKI KATSUHIRO , FUJISHIRO TAKATSUGU
IPC分类号： G03G15/20 , G03G21/16
摘要： PROBLEM TO BE SOLVED: To prevent an excessive oil left in a fixing device from being leaked when the fixing device is taken out from an image forming device body, and dispose or recover the excessive oil after taking out the fixing device with a safe method. SOLUTION: This fixing device has a fixing roller 1, a pressure roller 3 making contact with the fixing roller 1 to pressurize it, an oil applying means 5 making contact with the fixing roller 1 to apply a releasing oil 7 thereto, and an oil tank 6a for storing releasing oil 7. This device also has an oil leakage preventing means formed of an oil recovering tank 9 for preventing the leakage of the releasing oil 7 within the oil tank 6a at the replacement of the fixing device, which is provided in the lower part of the oil tank 6a, and a partitioning plate 10, and the partitioning plate 10 is slid to carry the releasing oil 7 within the oil tank 6a into an oil recovering tank 9, thereby preventing the leakage of the releasing oil 7.

67. 发明专利

JPH08314217A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH08314217A
公开(公告)日：1996-11-29
申请号：JP11599795
申请日：1995-05-15
申请人： RICOH KK
发明人： KUROTAKA SHIGEO , KANEKO TOSHIO , MOTOHASHI TAKESHI , AOKI KATSUHIRO , AKAFUJI MASAHIKO , KIMURA NORIYUKI , FUJISHIRO TAKATSUGU
IPC分类号： B41J29/13 , G03G15/00 , G03G21/16
摘要： PURPOSE: To easily execute a removing operation of a jammed paper by releasing the transmission of driving from a main body driving system to a fixing device, at the time of processing jamming. CONSTITUTION: A compression spring 40 is disposed on a placing table 31 on which a fixing unit 7a is dismountably mounted, to energize it upward. A compression spring 50 is disposed on a main body cover 8, to energize the fixing unit 7a downward, at the time of closing the cover. When the cover 8 is closed, the compression spring 40 is compressed by the energizing force of the compressing spring 50 and the weight of the fixing unit 7a and a main body side gear 37 is meshed with the gear 38 of a fixing roller 21, to transmit driving force. When the cover 8 is opened, the fixing unit 7a is moved upward by the compression spring 40 and the gears 37 and 38 are separated to release the transmission of the driving force, so that the jammed paper can be removed with a light load.

68. 发明专利

JPH0594067A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH0594067A
公开(公告)日：1993-04-16
申请号：JP6228592
申请日：1992-03-18
申请人： RICOH KK
发明人： SUGIYAMA TOSHIHIRO , MATSUDA ITARU , OGIYAMA HIROMI , KANEKO TOSHIO , WATANABE SHIGERU , KARASHIMA KENJI , SHINOZAKI ATSUSHI , KAWAMURA SHIZUO
IPC分类号： B65B43/26 , B65H1/04 , B65H11/00 , B65H47/00 , G03G15/00 , G03G15/20
摘要： PURPOSE:To prevent transfer missing and deviation in an image by reducing generation of wrinkling which tend to form when an envelope is fed. CONSTITUTION:The generation of wrinkling is prevented by providing a flap opening mechanism 20 opening a flap fa of the envelope Pf with the flap fa in a closed state upstream in the carrying direction than a paper ejection tray, and ejecting the envelope Pf, which was fed in a state where the wrinkling is easily generated with the flap closed and the paper overlapped with each other, in a state where the flap fa is opened. The flap opening mechanisms 20 are effective if they are provided downstream in the carrying direction of a fixing device 21, upstream of the carrying direction of an image transferring part, and furthermore in a paper feeding part, and if they are provided each to upstream and downstream of an image transferring part and operated selectively, the flap can be opened even after being printed with the flap closed in a printing where an image is on the flap.

69. 发明专利

JPH04249977A GRAPHICAL OUTPUT DEVICE 失效
公开(公告)号：JPH04249977A
公开(公告)日：1992-09-04
申请号：JP28518990
申请日：1990-10-23
申请人： RICOH KK
发明人： KANEKO TOSHIO , HANIYU YOSHIAKI , KUMAZAKI HITOMI
IPC分类号： B41J2/485 , G06F3/12 , G06T9/00 , G09G5/36 , H04N1/23 , H04N1/40 , H04N1/409
摘要： PURPOSE:To secure the consecutiveness of a picture and to enhance the anti- aliasing picture efficiency by selecting pulse width modulation or power modulation based on the result of discrimination of a picture element area rate. CONSTITUTION:The device is provided with a PDL controller 200 expanding a signal into an image picture in three colors (red, green, blue) while applying anti-aliasing processing to a page description language(PDL) sent from a host computer 100 in the unit of pages. When it is discriminated that an adjacent picture element in the main scanning direction of a noticed picture element is a prescribed picture element area or over, pulse width modulation is executed, and when it is discriminated that the adjacent picture element in the main scanning direction of the noticed picture element is a prescribed picture element area or below conversely, power modulation is executed. Moreover, when the adjacent picture element in the main scanning direction of the noticed picture element reaches a saturation density, the pulse width modulation is executed, and when the adjacent picture element in the main scanning direction of the noticed picture element does not reach a saturation density, the power modulation is executed.

70. 发明专利

JPH04215681A TRANSFER DEVICE 失效
公开(公告)号：JPH04215681A
公开(公告)日：1992-08-06
申请号：JP41092590
申请日：1990-12-14
申请人： RICOH KK
发明人： KANEKO TOSHIO
IPC分类号： G03G15/16
摘要： PURPOSE:To prevent a transfer blur and a transfer omission by improving the adhesion between a photosensitive belt and a transfer roller across the transfer paper. CONSTITUTION:The carrier of a photosensitive belt 1 is formed with a nickel seamless belt made of a magnetic substance, a transfer roller 12 is formed with a nonmagnetic conducting sleeve 21 provided with a polyurethane thin layer on aluminum storing a fixed magnet 22, and the photosensitive belt 1 and the transfer roller 12 are closely stuck by the mechanical pressing force and the magnetic attracting force.

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