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公开(公告)号：DE2844691A1
公开(公告)日：1979-04-26
申请号：DE2844691
申请日：1978-10-13
Applicant: MITA INDUSTRIAL CO LTD
Inventor： KATO MAMORU , YAMAURA SUSUMU , HIRAKATA OSAKA , KAMEZAWA YASUTOKI , AIZAWA TATSUO
Abstract: A transfer sheet for electrostatically transferring thereon an electrically conductive or electrically semi-conductive toner in electrostatic photography or electrostatic printing, which comprises a substrate and a toner-receiving layer formed on at least one surface of the substrate, which toner-receiving layer contains a composition comprising (A) 100 parts by weight of thermoplastic acrylic-styrene copolymer and (B) 10 to 100 parts by weight of dry method finely divided silica is disclosed. In this transfer sheet, the electric resistance can be maintained at a high level even under high humidity conditions, and a toner image can be transferred on this transfer sheet at a high transfer efficiency without broadening of contours of the image. This transfer sheet has feel and touch quite similar to those of ordinary paper and is very excellent in graphic characteristics.
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公开(公告)号：DE2834309A1
公开(公告)日：1979-02-15
申请号：DE2834309
申请日：1978-08-04
Applicant: MITA INDUSTRIAL CO LTD
Inventor： KOUCHI TOSHIHIRO , AIZAWA TATSUO , TAKAYAMA HIROSHI
Abstract: In a one-component type developer for electrophotography consisting essentially of a dry blend of fixing magneto-sensitive particles and flowability- and electric resistance-controlling fine particles, when an aromatic vinyl resin and/or an acrylic resin is used an a binder resin for the magneto-sensitive particles in combination with a low molecular weight olefin resin, the magneto-sensitive particles are much improved in the property of holding the flowability- and electric resistance-controlling fine particles on the surfaces thereof. Accordingly, these fine particles cannot be substantially separated from the magneto-sensitive particles under agitation conditions, development conditions and fixing conditions. As a result, contamination of the interior of a copying machine, especially an optical system, can be completely prevented, and also contamination of the background can be completely prevented. Further, the resulting fixed images have a very high resistance to friction and abrasion, and troubles such as blurring and flow of the image are not caused at all.
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公开(公告)号：IT7883621D0
公开(公告)日：1978-06-12
申请号：IT8362178
申请日：1978-06-12
Applicant: MITA INDUSTRIAL CO LTD
Inventor： OKADA TETSUYA , UMEDA TADASHI , MURAKAMI MASAHIRO , AIZAWA TATSUO
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公开(公告)号：FR2355320A1
公开(公告)日：1978-01-13
申请号：FR7716769
申请日：1977-06-01
Applicant: MITA INDUSTRIAL CO LTD
Inventor： MIYOSHI HIDEO , SHIBATA KIYOSHI , FUKUOKA SHOGO , AIZAWA TATSUO
Abstract: An electrostatic photographic copying machine includes a photosensitive body having a photosensitive layer on its surface, a charging apparatus, a developing device and a transfer device arranged along a moving passage of the photosensitive body. An optical system projects an image of an original onto the surface of the charged photosensitive body, and a fixation apparatus fixes a transferred image onto copying paper. The electrostatic photographic copying machine is provided with an original paper inserting port, an original paper carrying passage, a first original paper discharging port for discharging the original paper in a forward direction, a second original paper discharging port for discharging the original paper in a rearward direction, a copying paper supplying apparatus, copying paper carrying passages, a first copying paper discharging port for discharging the copying paper in a forward direction, a second copying paper discharging port for discharging the copying paper in a rearward direction, and changing mechanism for changing the directions of movement of the original paper and the copying paper to the forward and rearward directions thereof, respectively.
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公开(公告)号：DE2723098A1
公开(公告)日：1977-12-08
申请号：DE2723098
申请日：1977-05-21
Applicant: MITA INDUSTRIAL CO LTD
Inventor： MIYOSHI HIDEO , SHIBATA KIYOSHI , FUKUOKA SHOGO , AIZAWA TATSUO
Abstract: An electrostatic photographic copying machine includes a photosensitive body having a photosensitive layer on its surface, a charging apparatus, a developing device and a transfer device arranged along a moving passage of the photosensitive body. An optical system projects an image of an original onto the surface of the charged photosensitive body, and a fixation apparatus fixes a transferred image onto copying paper. The electrostatic photographic copying machine is provided with an original paper inserting port, an original paper carrying passage, a first original paper discharging port for discharging the original paper in a forward direction, a second original paper discharging port for discharging the original paper in a rearward direction, a copying paper supplying apparatus, copying paper carrying passages, a first copying paper discharging port for discharging the copying paper in a forward direction, a second copying paper discharging port for discharging the copying paper in a rearward direction, and changing mechanism for changing the directions of movement of the original paper and the copying paper to the forward and rearward directions thereof, respectively.
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Patent Agency Ranking
公开(公告)号：DE2723081A1
公开(公告)日：1977-12-08
申请号：DE2723081
申请日：1977-05-21
Applicant: MITA INDUSTRIAL CO LTD
Inventor： KIMURA HIROSHI , KITAGAWA TAKAICH , HISAJIMA MASAHIKO , YOSHIKADO SHOJI , AIZAWA TATSUO
Abstract: An electrostatic photographic copying machine includes a device for automatically exchanging used master paper with fresh master paper on a master holding body, and for indicating when such an exchange should be initiated. The machine includes an apparatus for cleaning the fixing roller, an apparatus for adjusting the amount of toner supplied to the developer, a transfer device whereby improper discharge is prevented, a transfer paper jam detector, and a device for improved mixing of developer.
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公开(公告)号：DE2721827A1
公开(公告)日：1977-12-01
申请号：DE2721827
申请日：1977-05-13
Applicant: MITA INDUSTRIAL CO LTD
Inventor： KATO YOSHIAKI , FUSHIDA AKIRA , UEDA YASUO , TOHI YASUSUKE , AIZAWA TATSUO
Abstract: An electrophotographic photosensitive material suitable for offset printing and lithography comprising a flexible substrate, an electroconductive back coat layer formed on one surface of the substrate, an electroconductive intermediate layer formed on the other surface of the substrate and a photoconductive layer formed on the intermediate layer, said photoconductive layer being composed of a fine powder of a photoconductor dispersed in an electrically insulating resin, wherein said intermediate layer is composed of a composition comprising (A) an acrylic resin, (B) a vinyl acetate polymer having a degree of polymerization of 100 to 1700 and (C) a resinous conducting agent, in said composition the weight ratio of acrylic resin (A)/vinyl acetate polymer (B) is in the range of 4/1 to 10/1 and the amount of the conducting agent (C) is 20 to 100 parts by weight per 100 parts by weight per 100 parts by weight of the sum of the components (A) and (B), said intermediate layer has such a multi-layer distribution structure that a combination of the vinyl acetate polymer and the acrylic resin is predominantly distributed in the surface portion falling in contact with the photoconductive layer, and the photoconductive layer is bonded to the intermediate layer through said surface portion.
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公开(公告)号：DE2648253A1
公开(公告)日：1977-04-28
申请号：DE2648253
申请日：1976-10-25
Applicant: MITA INDUSTRIAL CO LTD
Inventor： KOZUKA NOBUHIKO , MATSUMOTO SHOJI , OKADA TETSUYA , GOTODA KATSUHIKO , AIZAWA TATSUO
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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
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.
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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
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.
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