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71. 发明专利

JPH06324579A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH06324579A
公开(公告)日：1994-11-25
申请号：JP11048593
申请日：1993-05-12
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： MIWA MASATO , KIKUCHI YASUO , NOBUMORI SHIYOUGO , MITSUYA TERUAKI
IPC分类号： G03G15/16 , G03G21/00 , G03G21/10
摘要： PURPOSE:To surely prevent deterioration of a transfer belt caused by wear by providing a reverse-polarity charger downstream of a position where paper is separated from a transfer belt, in the direction of paper feed, for cleaning the transfer belt. CONSTITUTION:A reverse-polarity charger 8 is placed downstream of a position P where paper 12 is separated from a transfer belt 1, in the direction of paper feed, and is removably supported by charger supporting portions 13a, 13b. Of the charger supporting portions 13a, 13b, at least the charger supporting portion 13b is molded from plastics and has a rib 13c provided in the upper portion thereof to guide the paper 12. When a toner transferred onto the transfer belt 1 passes near the reverse-polarity charger 8, the toner polarity on the transfer belt 1 is reversed to + since a positive voltage is being applied to the reverse- polarity charger 8. In this case, materials left on the transfer belt 1 can be removed by application of a voltage to the reverse-polarity charger 8 simultaneous with the start of rotation of the transfer belt 1.

72. 发明专利

JPH06161195A ELECTROPHOTOGRAPHIC RECORDING DEVICE 失效
公开(公告)号：JPH06161195A
公开(公告)日：1994-06-07
申请号：JP31162192
申请日：1992-11-20
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： OKANO MAMORU , HOSHI NOBUYOSHI , KOBAYASHI SHINYA , MITSUYA TERUAKI , FUJIWARA SHIGETAKA , MASUDA KAZUTO , KIKUCHI YASUO
IPC分类号： B41J2/44 , G03G15/00 , G03G15/04 , G03G15/043 , G03G15/06 , H04N1/23 , H04N1/29
摘要： PURPOSE:To change the exposure quantity according to the use environment and state of a device and a developer so as to obtain constant image quality by controlling a bias voltage control means and an exposure quantity control means interlockingly. CONSTITUTION:Image data 2 from a host device 1 is sent to a memory 3 according to the printing order of an electrophotographic recording device. The dot array of an image is determined on the basis of the image data 2 and printed. A pattern recognizing device 4 recognizes whether the printed image indicated by the data stored in the memory 3, the dot, array, and the like is a plane image or a line image, and sends the recognized result to a data base 5. The data base 5 is stored with appropriate exposure quantity to the plane image and line image obtained previously by experiment and analysis. Constant image quality can be obtained by thus collating the recognized data with the data base 5 to determine the exposure quantity for exposure.

73. 发明专利

JPH06138776A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH06138776A
公开(公告)日：1994-05-20
申请号：JP29242092
申请日：1992-10-30
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MASUDA KAZUTO , TAKUMA YASUO , IKAWA TATSUO , MITSUYA TERUAKI , SUZUKI TAKASHI
IPC分类号： G03G15/14 , G03G15/16
摘要： PURPOSE:To provide an image forming device capable of preventing the peeling and electrifying of a transfer material occurring at the time of peeling the transfer material from a transferring/carrying belt, the scattering of an image forming medium on the transfer material and the generation of the discharge pattern of the image forming medium on the transfer material after being peeled, without reducing the performance of the destaticization means caused by long-term use, and obtaining a high grade image. CONSTITUTION:The charge of the polarity reverse to that of the image forming medium 23 is generated. The destaticization means 21 not having a counter electrode is used. The destatization means 21 is installed in a position just after the transfer material 9 is peeled from a transferring/carrying belt 10, the opening part of the destaticization means 21 is installed so as to face the surface reverse to the surface of the transfer material 9 to which an unfixed image forming medium 23 is stuck. Further, the charge generating part of the destaticization means 21, for instance, a straight line connecting a wire with the peeling point of the transfer material 9 from the transferring/carrying belt 10 is not covered so that the charge generated by the destaticization means 21 is imparted to the rear side of the transfer material 9, to obtain the peeling point.

74. 发明专利

JPH0619357A FIXING DEVICE AND ELECTROPHOTOGRAPHIC RECORDER 失效
公开(公告)号：JPH0619357A
公开(公告)日：1994-01-28
申请号：JP17231992
申请日：1992-06-30
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MITSUYA TERUAKI , MASUDA KAZUTO , SUZUKI TAKASHI , UNO KAZUO
IPC分类号： B65H29/24 , G03G15/20 , G03G21/00 , G03G21/10
摘要： PURPOSE:To remove offset toner without causing erroneous printing by resolving the particles of the offset toner which is recognized when a toner image is fixed on a recording paper to the offset toner which can not be recognized. CONSTITUTION:In the case an unfixed toner image formed on the recording paper is inserted to pass through fixing rollers 1 and 2, it passes so that an unfixed toner image carrying surface may come in contact with the heated fixing roller. In such a case, the brush 7 of a brush roller 3 is made of nylon fiber and the roller 3 is rotated by following the rotation of a heat roller(HR) 1, and the offset toner 6 is resolved. Therefore, the offset toner 6 is resolved on the surface of the HR 1 by following the rotation without being separated from the surface of the HR 1. Namely, by making the circumferential speed of the HR 1 coincide with that of the roller 3, the scraping effect of the offset toner 6 by the brush 7 of the roller 3 is prevented. Therefore, the offset toner is removed without causing the erroneous printing by using the recording paper 4 submitted for printing.

75. 发明专利

JPH05232827A 失效
公开(公告)号：JPH05232827A
公开(公告)日：1993-09-10
申请号：JP6292191
申请日：1991-03-27
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： SUZUKI TAKASHI , MITSUYA TERUAKI
IPC分类号： B65H5/00 , G03G15/00 , G03G15/16 , G03G15/20
摘要： PURPOSE:To provide an electrophotographic printer where the miniaturization of the device is achieved and a jam which has conventionally occurred owing to the defective sparation of a transfer body between the paper guide and the toner transfer belt is eliminated. CONSTITUTION:The transfer belt 7 is held by being directly wrapped around a pressure roller 13 which is on the downstream side in the rotating direction of the transfer belt 7 for carrying a body 5 to be transfered and opposite a toner fixing roller 12. On the downstream side in the rotating direction of the transfer belt 7, the body 5 to be transfered on which a toner image 10 is transferred is directly sent between the fixing roller 12 and the pressure roller 13. By eliminating the need for a belt holdling roller, which has been conventionally provided in this part, and, in addition, a paper guide, etc., the miniaturization of the electrophotographic printer can be achieved. At the same time, by making the paper guide unnecessary, a jam which has conventionally occurred owing to the defective separation of the body to be transferred between the paper guide and the transfer belt can be eliminated.

76. 发明专利

JPH05210331A DEVICE AND METHOD FOR FIXING TONER IMAGE AND ELECTROPHOTOGRAPHIC RECORDER AND FACSIMILE DEVICE 失效
公开(公告)号：JPH05210331A
公开(公告)日：1993-08-20
申请号：JP31428991
申请日：1991-11-28
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MITSUYA TERUAKI , MASUDA KAZUTO , SUZUKI TAKASHI , UNO KAZUO
IPC分类号： G03G15/00 , G03G13/20 , G03G13/26 , G03G15/20 , G03G15/22 , G03G21/00 , G03G21/10
摘要： PURPOSE:To provide a printing device where offset toner is decreased and removed and misprinting does not occur. CONSTITUTION:This device is provided with a rotating fixing roller 1 so as to fix a toner image 5 formed on a recording medium (recording paper) 4. The fixing roller 1 is heated, and the toner image 5 is fixed on the recording medium 4 while it is pressed and brought into contact with the fixing roller 1. The minute offset toner particles 6 are accumulated and broken down to such minute particles that they are not recognized as an image before they become such large particles that they are recognized as the image by an offset toner breakdown device. Desirably, the offset toner breakdown means is a brush roller 3, which follows the rotating fixing roller 1 and is rotated equally to the rotating circumferential speed of the fixing roller 1 in substance. As for the amount of the formed offset toner 6, the occurrence of the offset toner 6 on the fixing roller 1 is restrained and reduced by decreasing the torque fluctuation of a driving motor for the fixing roller 1.

77. 发明专利

JPH03107956A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH03107956A
公开(公告)日：1991-05-08
申请号：JP24732589
申请日：1989-09-22
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MITSUYA TERUAKI , FUJIWARA SHIGETAKA , KUMASAKA TAKAO
IPC分类号： G03G15/00 , G03G15/01 , G03G15/20
摘要： PURPOSE:To eliminate the needs for a carrying path, which makes a detour around a fixing station and an inverting tray and to contrive miniaturization by providing the electrophotographic device with a paper reciprocally carrying means, which allows the paper to be moved reciprocally and the fixing station, which fixes recording information onto the paper, and also providing a carrying line, along which the paper is carried from the paper carry-in port side of the fixing station to a photosensitive body, with a paper returning means. CONSTITUTION:The paper 2 is carried to the photosensitive body 20 via the carrying line along which it is carried to the photosensitive body 20; recording information on the photosensitive body 20 is transferred on the first side of the paper 2; then, the paper 2 is carried from the paper carry-in port side of the fixing station 5 to the inside of the station 5, and fixing on the paper is carried out by a fixing machine. After the fixing is finished, the paper 2 is ejected from the paper carrying-in port side of the fixing station 5 by the paper reciprocally carrying means 40-42, and is returned to the carrying line by the returning means 43. At this time, the paper 2 is already inverted; when it is carried to the photosensitive body 20 again via the carrying line, recording information on the photosensitive body 20 is transferred on the second side of the paper 2. Thus, the needs for the carrying path, which makes a detour around the fixing station, and the inverting tray is eliminated and the miniaturization can be contrived.

78. 发明专利

JPH01147466A TONER FOR DOUBLE SIDED PRINTING 失效
公开(公告)号：JPH01147466A
公开(公告)日：1989-06-09
申请号：JP30565387
申请日：1987-12-04
申请人： HITACHI LTD , HITACHI CHEMICAL CO LTD , HITACHI KOKI KK
发明人： MITSUYA TERUAKI , KUMAGAI YUGO , KATO KOJI , KUMASAKA TAKAO
IPC分类号： G03G9/08 , G03G9/087
摘要： PURPOSE:To improve the fixability of a toner using styrene-acrylic resin by setting the thermal diffusivity of the toner at a specified value. CONSTITUTION:The thermal diffusivity of a toner for double sided printing having 50-80 deg.C glass transition temp. and contg. at least styrene-acrylic resin as a binding resin is set at >=3X10 m /hr. The heat conduction of the toner can be improved, the temp. of the vicinity of the point of contact of the toner with a recording body rises sufficiently at the time of fixing and the fixability of the toner is improved. A toner usable for double side printing can be obtd.

79. 发明专利

JPH01124869A BOTH-SURFACE RECORDER 失效
公开(公告)号：JPH01124869A
公开(公告)日：1989-05-17
申请号：JP28217987
申请日：1987-11-10
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MITSUYA TERUAKI , KUMASAKA TAKAO , UMEDA TAKAO , HORI YASURO , SHIMOKAWABE IKUO , HOSHI NOBUYOSHI
IPC分类号： G03G15/00 , G03G15/20 , G03G15/23
摘要： PURPOSE:To prevent a component on a conveyance path, etc., from being stained by conveying the printing surface of recording paper with an air flow without containing until the toner image surface is solidified. CONSTITUTION:The recording paper 13 which is sent from a recording paper entrance 10 is passed through a conveyance path 4 and a development station 3 forms a toner image 14. Then the recording paper 13 is fixed by a heat roll 1 and a backup roll 2, and sent to an aerial conveying device 15. The device 15 blows an air blow out of upper and lower blow-out holes 21 to convey the paper 13 while cooling the image 14. Then when the image 14 reaches an inversion claw 9, the toner is fixed completely and the end is separated from the rollers 1 and 2 at the same time 13. Consequently, the paper 13 is conveyed stably in the device 15 and toner sticks on neither an inversion path 6 and a conveyance path 8.

80. 发明专利

JPS63243983A FIXING DEVICE FOR RECORDER 失效
公开(公告)号：JPS63243983A
公开(公告)日：1988-10-11
申请号：JP7579987
申请日：1987-03-31
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MITSUYA TERUAKI , KUMASAKA TAKAO , HIGAKI MASARU , FUJIWARA SHIGETAKA
IPC分类号： G03G15/20
摘要： PURPOSE:To surely detect the timing of flash light emission without using a shutter mechanism and to prevent mis-shot and failure in emission of a flash light by providing a recording paper detector so as to prevent direct projection of the flash light of a flash lamp thereto. CONSTITUTION:Recording paper 5 is conveyed by a conveyance path 14 and an unfixed toner is adhered as an image on the surface thereof by a transfer device 7; thereafter, the paper is conveyed to the position right under a flash fixing device 1, where the flash light of the flash lamp 15 is projected toward the surface of the paper 5. The recording paper detector 4 in this case is installed in the position within the range nearer the paper feed side than the position right under the device 1 and nearer the paper feed side than a bent part Q. The flash light is, therefore, not directly projected to the detector and since the leak light of the flash light is shielded by the bent part Q, the light intensity thereof is considerably lowered. The direct incident flash light on the detector is thereby eliminated and in addition, the intensity of the leak flash light is weak; therefore, the failure and malfunction (wrong detection of recording paper) of the detector 4 are prevented and the mis-shot and failure in emission of the flash light are eliminated accordingly.

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