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21. 发明专利

JPH04204786A CLEANING DEVICE FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH04204786A
公开(公告)日：1992-07-27
申请号：JP33768490
申请日：1990-11-30
申请人： HITACHI KOKI KK
发明人： MAEDA SADAKI , HARADA TOSHIMITSU , NISHINO SHINICHI , OGAWA TOSHITAKA
IPC分类号： G03G21/10 , G03G15/01 , G03G21/00
摘要： PURPOSE:To attach a color developing machine, to eliminate the need of the attachment of a touch/detach driving device to a monocolor printer rotating a photosensitive body plural times and forming an image thereon, and to attain reduction in cost by attaching/detaching the contact/uncontact driving device of the cleaning device of the photosensitive body. CONSTITUTION:The contact/uncontact driving device 8 touching/detaching or abrading the cleaning device 1 carrying out the cleaning of the photosensitive body 2 is united, and constituted so as to be attached/detached from the cleaning device 1. In other words, latch members 30 and 31 attached on one ends of springs 26 and 27 attached to the frame 33 of the touch/detach driving unit 8 are caught on the hook of the cleaning device 1, pulled it and pressed and fixed on cams 21 and 22. Therefore, the cleaning device 1 can be touched/ detached to/from the photosensitive body 2, or abrade it, by the actions of the cams 21 and 22, centering stays 15 and 16. Thus, a multiprinter rotating the photosensitive body plural times and forming the image thereon, can be obtained.

22. 发明专利

JPH04204785A CLEANING DEVICE FOR ELECTRPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH04204785A
公开(公告)日：1992-07-27
申请号：JP33768390
申请日：1990-11-30
申请人： HITACHI KOKI KK
发明人： HARADA TOSHIMITSU , MAEDA SADAKI , NISHINO SHINICHI , OGAWA TOSHITAKA
IPC分类号： G03G21/00 , G03G21/10
摘要： PURPOSE:To prolong the life of a blade and a cleaner by using a metallic blade as a cleaning blade, and obtaining a difference in the hardness of the blade and a cleaning roll. CONSTITUTION:Toner 2 remaining on the surface of a photosensitive body 1 is electrostatically removed by a conductive cleaning brush 3 on which a bias is applied by a brush bias applying means 8. Further, the toner 2 is electrostatically stuck to the cleaning roll 4 on which a high bias voltage is applied by an applying means 9, carried up to the metallic blade 6 held by a blade holder 5 to be scratched off, and exhausted outside a device by a toner recovery screw 7. At such a time, a phosphor bronze plate consisting of phosphor, copper, tin, etc., is used for the metallic blade 6, and a stainless pipe is used for the cleaning roll 4, so that a combination that the hardness of the blade is lower than that of the roll is adopted. Thus, the life of the cleaner is increased, running cost per a page is reduced, and the liberalization of maintenance is attained.

23. 发明专利

JPH04204780A ELECTROPHOTOGRAPHIC IMAGE FORMING DEVICE 失效
公开(公告)号：JPH04204780A
公开(公告)日：1992-07-27
申请号：JP33765190
申请日：1990-11-30
申请人： HITACHI KOKI KK
发明人： KIKUCHI TAKAHIRO , NISHINO SHINICHI , YAMADA MASATO , OGAWA TOSHITAKA , SAKAMOTO ATSUSHI
IPC分类号： G03G15/16
摘要： PURPOSE:To transfer excellently image quality and to simultaneously prevent a peeling failure by arranging a corona discharger within a nip region where a photosensitive drum comes into contact with a transfer belt. CONSTITUTION:The corona discharger 2 is arranged within the nip region where the photosensitive drum 7 comes into contact with the transfer belt 1. Therefore, the electric field of the corona discharger 2 can be shut in the nip region as a region where the photosensitive drum 7 comes into contact with the transfer belt 1. Consequently, toner whose attracting force with respect to the photosensitive drum 7 is weakened by a destaticizer 9 is prevented from being peeled before development and being stuck to the side of a sheet 5. Thus, the excellent image quality can be obtained while having no blur around an image, caused by the sticking of the toner to a part except an image part.

24. 发明专利

JPH04204769A ELECTROPHOTOGRAPHIC PRINTER 失效
公开(公告)号：JPH04204769A
公开(公告)日：1992-07-27
申请号：JP33765290
申请日：1990-11-30
申请人： HITACHI KOKI KK
发明人： KOBAYASHI JUNJI , SAKAMOTO ATSUSHI , NISHINO SHINICHI
IPC分类号： G03G15/02 , G03G15/00 , G03G15/04 , G03G15/043 , G03G15/047 , G03G15/14
摘要： PURPOSE:To prevent a failure in peeling by detecting the surface potential of a photosensitive drum before a transfer and controlling a surface potential adjusting means such as pretransfer erasing light, or the peeling means of an AC corona dischager, etc., or both of the surface potential adjusting means and the peeling means. CONSTITUTION:The surface potential of the photosensitive drum before the transfer is detected and the surface potential of the photosensitive drum is controlled by the surface potential adjusting means such as the pretransfer erasing light, so as to properly carry out the peeling of a sheet after the transfer, and a sheet peeling means such as the AC corona discharger 12, and an electrifier 2 is controlled. In other words, the surface potential of the photosensitive drum before the transfer is properly adjusted, and the current, voltage, etc., of the AC corona discharger 12, the electrifier 2, etc., for peeling the sheet are properly controlled. Thus, pollution caused by the toner of the photosensitive drum surface potential adjusting means such as the erasing light is periodicaly cleaned and a secular change in the characteristics of the photosensitive drum 1 and its environmental dependency change are prevented.

25. 发明专利

JPH0467189A CLEANING DEVICE FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH0467189A
公开(公告)日：1992-03-03
申请号：JP18013090
申请日：1990-07-06
申请人： HITACHI KOKI KK
发明人： OGAWA TOSHITAKA , NISHINO SHINICHI , KOBAYASHI JUNJI , HARADA TOSHIMITSU , MAEDA SADAKI
IPC分类号： G03G21/00 , G03G21/10
摘要： PURPOSE:To eliminate the occurrence of insufficient cleaning and, at the same time, to reduce the cost of a cleaning device by using a conductive elastic roll for a recovering roll. CONSTITUTION:A recovering roll 14 is an elastic body made of urethane rubber added with carbon, etc., having a resistance value which is almost equal to that of a cleaning brush 13 and hardness of 30-60. Since such an elastic roller is used for the recovering roll 14, the surface roughness of the roll 14 and a cleaning blade 18 can be allowed to the extent of the elastic deformation of the roll 14 and the partial defects of the materials respectively forming the roll 14 and blade 18 and partial omission of the roll 14 and blade 18 produced by foreign matters mixed from the outside of a cleaning device can be prevented. Therefore, occurrence of insufficient cleaning can be prevented and the cost of the cleaning device can be reduced.

26. 发明专利

JPH0442240A ELECTROPHOTOGRAPHIC PRINTING DEVICE 失效
公开(公告)号：JPH0442240A
公开(公告)日：1992-02-12
申请号：JP15121690
申请日：1990-06-08
申请人： HITACHI KOKI KK
发明人： FURUHATA KAZUHIRO , NISHINO SHINICHI , OGAWA TOSHITAKA
IPC分类号： G03G15/02 , G03G15/00 , G03G15/16 , G03G21/00
摘要： PURPOSE:To prevent the material or the electric characteristic of a transfer belt from being changed and to improve the quality of printing and the reliability of a device by intermittently or always rotating the transfer belt at the non-printing time of the device. CONSTITUTION:A toner image on a photosensitive body 6 is transferred to a material to be transferred by attracting the material to be transferred to the transfer belt 1 which is electrostatically charged by corona discharging and carrying it. Besides, the belt 1 is set to be endless. Then, by successively or intermittently driving the belt 1 at the non-printing time, relative position between the belt 1 and corona dischargers 2 - 5 disposed by being faced to the circumference of the belt 1 is changed. Thus, since one part of the belt 1 is prevented from being concentrically exposed to O3 and NOX the material or the electric characteristic of the belt 1 is prevented from being changed and the quality of the printing or the reliability of the device is improved.

27. 发明专利

JPH0429273A DEVELOPING MACHINE 失效
公开(公告)号：JPH0429273A
公开(公告)日：1992-01-31
申请号：JP13576390
申请日：1990-05-25
申请人： HITACHI KOKI KK
发明人： SAKUMA YUKINORI , FUJINUMA YOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G15/08
摘要： PURPOSE:To always stabilize the output value of a toner concentration sensor and to detect the toner concentration of a developer with sufficient precision by providing a developer forcibly carrying member periodically facing to the sensor and rotating, on the rotary shaft of an auger. CONSTITUTION:The developer forcibly carrying member 3 is loaded to a developer U-turn part 6. In the U-turn part 6, the delivery of the developer 5 from one screw-like auger 1 to the other screw-like auger 2 is smoothly carried out. Then, the developer forcibly carrying member 3 is provided on a position where it is periodically opposed to the sensor 4 and rotates, on the shaft of one auger 1 facing to the toner concentration sensor 4, out of two screw-like augers 1 and 2. Therefore, a specific developer 5 is prevented from being stagnated on the detecting surface of the toner concentration sensor 4 for a long time, and the output value of the toner concentration sensor 4 is prevented from being irregular and unstable, as well. Thus, the output value of the toner concentration sensor 4 is always stabilized, and the toner concentration of the developer can be detected with the sufficient precision.

28. 发明专利

JPH0429271A DEVELOPER FEEDING DISCHARGING MECHANISM 失效
公开(公告)号：JPH0429271A
公开(公告)日：1992-01-31
申请号：JP13574890
申请日：1990-05-25
申请人： HITACHI KOKI KK
发明人： FUJINUMA YOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G15/08
摘要： PURPOSE:To shorten the handling time of a developer exchanging work and to simultaneously obtain stable printing quality without being affected by the life of a developer by discharging the developer of a prescribed quantity set in advance and supplying the fresh developer of the almost same quantity as a discharging quantity, when the used quantity of the developer inside a developing machine reaches a value set in advance. CONSTITUTION:The developer discharging part of the developing machine 1 is communicated with a developer container by a discharging pipe 8 via a discharging valve 7. When the used quantity of the developer 2 reaches the value set in advance, a part of the developer 2 finished to be used is exhausted by the prescribed quantity set in advance, the fresh developer 4 of almost the same quantity as the discharging quantity is fed to the developing machine 1 from a housing tank 3. In other words, the developer 2 is automatically and continuously discharged little by little and the fresh developer 4 of the same quantity is fed little by little, before the developer 2 inside the developing machine 1 is degraded in its quality reacher its service life. Thus, a period for carrying out the exchanging work of the developer 2 is prolonged, and simultaneously, the printing quality can be always stabilized.

29. 发明专利

JPH03123371A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH03123371A
公开(公告)日：1991-05-27
申请号：JP26233389
申请日：1989-10-06
申请人： HITACHI KOKI KK
发明人： KOBAYASHI JUNJI , SAKAMOTO ATSUSHI , NISHINO SHINICHI
IPC分类号： G03G15/02 , G03G15/00 , G03G15/06 , G03G15/08 , G03G21/00
摘要： PURPOSE:To prevent soiling of a drum and to prevent change in surface potential by fixing a range of potential difference of a non image part potential on the photosensitive drum and developing bias voltage to a specified amount and by providing a reference voltage generating device, and a drum surface potential controlling electrode. CONSTITUTION:An electrifying film of the photosensitive drum 1 is electrified to positive potential VO by an electrifying device 2, and when the electrifying film is neutralized by irradiating with a laser beam, VO is lowered to VR. When the bias voltage VBP given to a developing sleeve is lowered to less than VR, negative toner is stuck even to the part irradiated with the laser beam (non image part), causing surface fogging and soiling. To prevent this, VBP is made as close to VR as possible, and the attracting force against the positively electrified toner is weakened. In a standard developing, since there is little fluctuation of VR, VBP is set sufficiently close to VR. Then, if the difference between potential VO of non image part of the photosensitive drum and the developing bias potential VBN(VO - VBN) is selected between 50 to 300 volts, the electrophotographic device of a reverse developing method where soiling of the nonimage part does not generate is obtained.

30. 发明专利

JPS63138377A FLASH FIXING DEVICE 失效
公开(公告)号：JPS63138377A
公开(公告)日：1988-06-10
申请号：JP28417686
申请日：1986-12-01
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： KUMASAKA TAKAO , MITSUYA TERUAKI , FUJIWARA SHIGETAKA , NISHINO SHINICHI , YAMADA MASATO
IPC分类号： F21V3/04 , G03G15/20 , H05B7/02
摘要： PURPOSE:To prevent a protection plate from reaching high temperature and to increase light transmissivity by providing an anti-reflection film on the surface of a glass plate. CONSTITUTION:A lamp house 6 is provided outside, a reflecting plate 2 is arranged inside, and a flash lamp 1 is installed further inside. The reflecting plate 2 is of roof-shaped constitution and has the glass plate 8 at its lower opening part, and a guide member 5 guides recording paper 4. Anti-reflection films 8A and 8B are provided on both surfaces of the glass plate 8 and stuck by coating. Consequently, the reflection on the glass plate is reduced and its temperature is prevented from becoming high.

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