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    ELECTROSTATIC COPYING PROCESS AND APPARATUS
    1.
    发明专利
    ELECTROSTATIC COPYING PROCESS AND APPARATUS 未知

    公开(公告)号：CA1125356A

    公开(公告)日：1982-06-08

    申请号：CA301377

    申请日：1978-04-18

    Applicant: MITA INDUSTRIAL CO LTD

    Inventor： MATSUMOTO SHOJI ,  MATSUI TOSHIKAZU ,  IKEDA TOSHIMITSU ,  KOZUKA NOBUHIKO ,  NISHIHAMA HITOSHI ,  AIZAWA TATSUO

    IPC: G03B27/50 ,  B65H1/00 ,  G03G13/09 ,  G03G15/00 ,  G03G15/09 ,  G03G15/16 ,  G03G15/30 ,  G03G21/00 ,  G03G21/10 ,  G03G21/14 ,  G03G21/16

    Abstract: An electromagnetic copying apparatus comprising a housing having at its top surface a transparent plate on which to place an original to be copied, a rotary drum disposed within the housing and having a photosensitive member on its surface, a charging, a developing, a transferring and a cleaning means which are successively arranged around the rotary drum in the moving direction of its surface. an optical system for projecting the image of the original onto the surface of the rotary drum between the charging means and the developing means, and a receptor sheet conveying system for transferring a receptor sheet through a transfer station defined between the surface of the rotary drum and the transferring means; wherein a support is mounted on the housing so that it is slidable in the forward and rearward directions between its operating position within the housing and its pulled-out position ahead of the housing, and the rotary drum and the developing device are mounted on the support so that they can be separately and independently detached from the support. An electrostatic copying process can be efficiently practiced by using this apparatus.

    ELECTROSTATIC COPYING PROCESS AND APPARATUS
    2.
    发明专利
    ELECTROSTATIC COPYING PROCESS AND APPARATUS 未知

    公开(公告)号：CA1120093A

    公开(公告)日：1982-03-16

    申请号：CA371011

    申请日：1981-02-16

    Applicant: MITA INDUSTRIAL CO LTD

    Inventor： MATSUMOTO SHOJI ,  MATSUI TOSHIKAZU ,  IKEDA TOSHIMITSU ,  KOZUKA NOBUHIKO ,  NISHIHAMA HITOSHI ,  AIZAWA TATSUO

    IPC: G03G21/00

    Abstract: The invention relates to an electrostatic copying apparatus of type in which an electrostatic latent image is developed on the surface of a photosensitive member by applying a fine powdery developer to the electrostatic latent image to form a toner image which is transferred to a receptor sheet after which the remaining electrostatic charge on the photosensitive member is eliminated and the photosensitive member cleaned of excess developer. The cleaning step is carried out, according to the invention, by magnetically holding the same developer as used in the developing step on the surface of a developer-holding member by means of a magnet disposed within the developerholding member, moving the surface of the developer-holding member in a direction opposite to the moving direction of the surface of the photosenstive member to contact the two surfaces at reasonable relative speeds through the layer of the developer, and thus mechanically brushing the surface of the photosensitive member by the layer of the developer.

    ELECTROSTATIC COPYING PROCESS AND APPARATUS
    3.
    发明专利
    ELECTROSTATIC COPYING PROCESS AND APPARATUS 未知

    公开(公告)号：CA1145386A

    公开(公告)日：1983-04-26

    申请号：CA390932

    申请日：1981-11-25

    Applicant: MITA INDUSTRIAL CO LTD

    Inventor： MATSUMOTO SHOJI ,  MATSUI TOSHIKAZU ,  IKEDA TOSHIMITSU ,  KAZUKA NOBUHIKO ,  NISHIHAMA HITOSHI ,  AIZAWA TATSUO

    IPC: G03G15/26

    Abstract: An electrostatic copying apparatus comprising a housing having at its top surface a transparent plate on which to place an original to be copied, a rotary drum disposed within the housing and having a photosensitive member on its surface, a charging, a developing, a transferring and a cleaning means which are successively arranged around the rotary drum in the moving direction of its surface, an optical system for projecting the image of the original onto the surface of the rotary drum between the charging means and the developing means, and a receptor sheet conveying system for transferring a receptor sheet through a transfer station defined between the surface of the rotary drum and the transferring means; wherein a support is mounted on the housing so that it is slidable in the forward and rearward directions between its operating position within the housing and its pulled-out position ahead of the housing, and the rotary drum and the developing device are mounted on the support so that they can be separately and independently detached from the support. An electrostatic copying process can be efficiently practiced by using this apparatus.

    5.
    发明专利
    未知

    公开(公告)号：DE2503994A1

    公开(公告)日：1975-08-07

    申请号：DE2503994

    申请日：1975-01-31

    Applicant: MITA INDUSTRIAL CO LTD

    Inventor： MATSUMOTO SHOJI ,  NISHIHAMA HITOSHI ,  AIZAWA TATSUO

    IPC: G03G15/16 ,  G03G7/00 ,  G03G13/16 ,  G03G9/08

    Abstract: A transfer sheet on which toner images free of broadening of edge portions and having sharp contours can be transferred even in the electrophotography or electrostatic printing of the transfer type using conductive or semiconductive toners, i.e., magnetic toners, is disclosed. This transfer sheet is characterized in that a conductive or semiconductive toner-receiving face having a volume specific resistance of at least 3x1013 OMEGA -cm is formed on at least one surface of a substrate of the transfer sheet.

    6.
    发明专利
    未知

    公开(公告)号：DE2338837A1

    公开(公告)日：1974-02-14

    申请号：DE2338837

    申请日：1973-07-31

    Applicant: MITA INDUSTRIAL CO LTD

    Inventor： MATSUMOTO SHOJI ,  NISHIHAMA HITOSHI ,  AIZAWA TATSUO

    IPC: G03G15/05 ,  G03G5/00 ,  G03G5/02 ,  G03G15/01 ,  G03G15/18 ,  G03G15/22 ,  G03G13/22

    Abstract: 1433350 Transferring latent images MITA INDUSTRIAL CO Ltd 30 July 1973 [31 July 1972] 36165/73 Heading G2H In a method of charge image transfer electrophotography employing a sensitive member having a conductive base 1, a photo-conductive layer 2 and a transparent insulating layer 3, the surface of the member is first charged primarily overall (using a direct current corona 5), the surface is then exposed to an image having light areas L and dark areas D and simultaneously or subsequently is subjected to a secondary charging (using an alternating current corona 9). The photoconductive layer is then treated (e.g. by overall light exposure) to eliminate the charge at the interface between the photo-conductive layer and the insulating layer, the resulting electrostatic image is transferred by contact to a transfer sheet which is then developed and fixed in the conventional manner. The characteristics of the alternating current used for secondary charging and/or the secondary charging time are chosen so that the electrostatic image formed on the surface of the member after dissipation of the interface charge has the same polarity as the polarity of the primary charging and so that the potential of the light areas L of said image is substantially equal to the "untransferable upper limit potential" and the potential of the dark areas D are higher than the said limit potential. The "untransferable upper limit potential" is defined as the upper limit of the potential which does not permit the electrostatic image to be transferred for a copy sheet by mere contact. A multi-colour electrophotographic apparatus employing this method comprises a sensitive surface A mounted on a drum 1 for circulation past primary charging station 4, a secondary charging and colour exposure station 28, an overall exposure station 39 and an electrostatic image transfer station M. Image-receiving material 10 is fed from a roll by a series of rollers, cut to a length corresponding to the length of the original by cutters 50, 51, and taken up by a suction drum 49 which advances it past the transfer station M, a developing zone and a fixing zone 71. To effect multi-colour reproduction the receiving sheet is circulated a plurality of times past the transfer station M, each time picking up one colour separation image of the original and being developed with the corresponding colour developer from one of a series of liquid developer troughs 57, 58, 59 and 60 which are brought selectively into a position above cams 69 and 70 by a transport device 56. Operation of the cams raises the selected trough into a developing position with a development electrode 65, 66, 67 or 68 adjacent the surface of drum 49. The images are fixed by heat from heaters 72 and the finished sheet is stripped from the drum by a device 73. The colour separation images are formed by positioning one of a series of coloured mirrors 34, 35, 36 and 37 in the path of light from an original a.

    ELECTROSTATIC COPYING PROCESS AND APPARATUS
    10.
    发明专利
    ELECTROSTATIC COPYING PROCESS AND APPARATUS 未知

    公开(公告)号：CA1120090A

    公开(公告)日：1982-03-16

    申请号：CA371012

    申请日：1981-02-16

    Applicant: MITA INDUSTRIAL CO LTD

    Inventor： MATSUMOTO SHOJI ,  MATSUI TOSHIKAZU ,  IKEDA TOSHIMITSU ,  KOZUKA NOBUHIKO ,  NISHIHAMA HITOSHI ,  AIZAWA TATSUO

    IPC: G03G15/26

    Abstract: The invention relates to an electrostatic copying apparatus of the type in which an electrostatic latent image is formed on the surface of a photosensitive member. Specifically, a corona discharge device is used to charge up the photosensitive member and an image of an original document is projected to the charged surface by an optical system including a lamp for illuminating the original thereby to form the electrostatic latent image. According to the invention, for a specified period of time which runs from the time when the corona discharge device for charging has been deenergized by the completion of the electrostatic latent image-forming step light is irradiated on the surface of the photosensitive member in an area downstream of the corona discharge device for charging and upstream of the developing device along the moving path of the surface of the photosensitive member.

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