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1. 发明专利

JPH06167912A CLEANING DEVICE AND CLEANING METHOD FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH06167912A
公开(公告)日：1994-06-14
申请号：JP31885892
申请日：1992-11-27
申请人： HITACHI KOKI KK
发明人： NISHINO SHINICHI , HARADA TOSHIMITSU
IPC分类号： G03G21/10 , G03G21/00
摘要： PURPOSE:To provide a cleaning device for preventing recovered toner, etc., from scattering, to prolong the life of a cleaning brush and also to provide a cleaning method for efficiently mending the cleaning brush at the printing operation time of an electrophotographic device. CONSTITUTION:As to the cleaning device for the electrophotographic device provided with the cleaning brush 3 for cleaning a part to be cleaned and a collecting roll 4 for removing and collecting dusts sticking to the cleaning brush 3, the cleaning brush 3 is separated from the part to be cleaned at the time other than the cleaning time, and also, the cleaning brush 3 is rotated in the direction reverse to that at the operation time for cleaning, so that the dusts, etc., sticking to the cleaning brush 3 are prevented from scattering outside the cleaning device and also the life of the cleaning brush 3 is prolonged.

2. 发明专利

JPH0571949B2 失效
公开(公告)号：JPH0571949B2
公开(公告)日：1993-10-08
申请号：JP22847286
申请日：1986-09-29
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： MITSUYA TERUAKI , KUMASAKA TAKAO , NISHINO SHINICHI , YAMADA MASATO , FUJIWARA SHIGETAKA
IPC分类号： G03G15/20 , G03G15/00 , G03G21/00

3. 发明专利

JPH04204791A CLEANING DEVICE FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH04204791A
公开(公告)日：1992-07-27
申请号：JP33766690
申请日：1990-11-30
申请人： HITACHI KOKI KK
发明人： OGAWA TOSHITAKA , NISHINO SHINICHI , HARADA TOSHIMITSU , MAEDA SADAKI
IPC分类号： G03G21/10 , G03G21/00
摘要： PURPOSE:To collect the foreign matter of paper powder, etc., mixed in a cleaning unit and to integrally exchange it with the cleaning unit by providing an air filter between the housing and sucking device of a cleaning device exhausting residual toner outside the housing. CONSTITUTION:A path 32 communicated with ducts 16 and 18 is formed on the housing 30 of the cleaning unit 20, and the air filter 21 capable of removing toner and the foreign matter of the paper powder, etc., is attached on the housing 30. Then, a vacuum device is connected with the cleaning unit 20 with a filter cover 33, and sucks the toner and the paper powder via the air filter 21. In other words, the foreign matter of the paper powder, etc., mixed on a printing process is removed by the air filter 21 inside the cleaning unit, and the cleaning unit 20 is periodically exchanged. Thus, the foreign matter of the paper powder etc., is periodically removed, and a trouble caused by the foreign matter of the paper powder, etc., is avoided.

4. 发明专利

JPH04204790A CLEANER FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH04204790A
公开(公告)日：1992-07-27
申请号：JP33768190
申请日：1990-11-30
申请人： HITACHI KOKI KK
发明人： SAKAMOTO ATSUSHI , HARADA TOSHIMITSU , FUJINUMA YOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G21/10 , G03G21/00
摘要： PURPOSE:To stabilize cleaning efficiency for a long time by setting the depth of the abrasion between a cleaning brush and a photosensitive body in such a manner that respective roller-like members disposed on a cleaner and a device side are abutted on the outer periphery of the photosensitive body. CONSTITUTION:The roller-like members 5 and 6 are on the driving shaft 7 as the same shaft as that of a fixing gear 3 and on the driving shaft 8 as the same shaft as that of a fixing gear 4, respectively, the shafts have outer diameters equal to the pitch circles of respective gears, and simultaneously, the roller-like members 5 and 6 have the same outer diameters, as well. The follower roller 8 has the same shaft as the rotary shaft of the cleaning brush 10. On the other end, the driving shaft 7 is positioned via the photosensitive body 1 as a member to be cleaned, and a printing frame 11. Therefore, the roller-like members 5 and 6 are abutted on the outer periphery of the photosensitive body, so that the depth (a) of the abrasion of the cleaning brush 10 and the photosensitive body 1 can be set. Thus, the abrasion/deformation of a positioning member is suppressed, and the cleaning efficiency is stabilized for the long time.

5. 发明专利

JPH04104216A PHOTOSCANNER 失效
公开(公告)号：JPH04104216A
公开(公告)日：1992-04-06
申请号：JP22135290
申请日：1990-08-24
申请人： HITACHI KOKI KK , HITACHI LTD
发明人： MOCHIZUKI KENJI , SAITO SUSUMU , NISHINO SHINICHI , KIKUCHI TAKAHIRO , ARIMOTO AKIRA
IPC分类号： G02B26/12 , G02B26/10 , G02B27/00 , G03G15/04 , H04N1/04
摘要： PURPOSE:To vary the diameter of a recording dot by a simple function over a wide range by inserting a refractive index member into an optical path of a converged or diverged beam and varying the diameter of a beam spot on a scanned medium. CONSTITUTION:The beam 7 projected by a light source 1 is collimated by a collimator lens 2 into a parallel beam, which is reduced by a cylindrical lens 3 only in a scanning vertical direction to form a line image nearby the reflecting surface of a rotary polygon mirror 4; and an Ftheta lens 5 is an anamorphic aspherical lens. The scanning direction is so arranged that an infinite distance point and a photosensitive drum surface are in optically conjugate relation; and the vertical scanning direction is so arranged that the periphery of the reflecting surface of the rotary polygon mirror and photosensitive drum surface are in optically conjugate relation. The line image nearby the reflecting surface of the rotary polygon mirror is formed on the photosensitive drum surface. Namely, the parallel plane plate 8 is interposed between the cylindrical lens 3 and rotary polygon mirror 4. The diameter of the beam spot is switched according to the recording dot density switching command of the controller of a laser printer, etc. Consequently, the scanning spot diameter is easily varied and print dot density varies over a wide range.

6. 发明专利

JPH0442286A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH0442286A
公开(公告)日：1992-02-12
申请号：JP15120290
申请日：1990-06-08
申请人： HITACHI KOKI KK
发明人： SAKAMOTO ATSUSHI , KIKUCHI TAKAHIRO , OGAWA TOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G15/16 , G03G21/00 , G03G21/06
摘要： PURPOSE:To prolong the service life of a photosensitive body while suppressing the time of irradiating the photosensitive body with light at a minimum by reducing the amount of destaticization in the case of printing the continuous paper rather than the case of printing cut paper. CONSTITUTION:Before transferring, a destaticizer 1 is connected through a lighting appliance 2 for pre-transferring destaticizer to an ON/OFF signal generator 3. A control part controls the ON/OFF signal generator 3 so as to turn on a fluorescent lamp 1 in the case of the cut paper and to turn it OFF in the case of the continuous paper according to the designation of the cut paper or the continuous paper from a host device, and the time of exposing the photosensitive body is suppressed at a minimum so as to prevent the optical fatigue of the photosensitive body. Thus, the service life of the photosensitive body can be prolonged in the machine of using both the cut paper and the continuous paper.

7. 发明专利

JPH0442275A ELECTROPHOTOGRAPHIC PRINTER 失效
公开(公告)号：JPH0442275A
公开(公告)日：1992-02-12
申请号：JP15120990
申请日：1990-06-08
申请人： HITACHI KOKI KK
发明人： OGAWA TOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G15/16 , B65H29/16 , G03G15/00 , G03G15/20 , G03G21/00
摘要： PURPOSE:To improve reliability for a device and to extend the service lifes of a transfer belt and a photosensitive material by moving the transfer belt so as to be separated from a heating roll when no print operation is performed. CONSTITUTION:A form 12 is inputted from a driving roll 15 side and is passed through a transfer part, and is carried to a fixing part consisting of the heating roll 2 and a pressurizing roll 3, etc. The transfer belt 1 is formed in such structure that it can be turned around the rotary shaft 20 of the driving roll 15, and the stoppage of printing is performed by turning and holding the transfer belt 1 to a position shown in dotted line around the rotary shaft 20 after a printed sheet 12 is carried. In such a way, it is possible to improve the reliability by separating the transfer belt 1 from the heating roll 2 keeping high temperature for a while after performing the printing, and to extend the service lives of the transfer belt 1 and the photosensitive material 4.

8. 发明专利

JPH0442262A DEVELOPING DEVICE FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH0442262A
公开(公告)日：1992-02-12
申请号：JP15120590
申请日：1990-06-08
申请人： HITACHI KOKI KK
发明人： MIWA KOJI , FUJINUMA YOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G15/09
摘要： PURPOSE:To stop the transportation of a developer from the sleeve surface of a magnet roll and to detach the developer from a photosensitive body by disposing one magnetic pole in the magnet roll and a member for suppressing the amt. of the developer to be transported in the positions where both face each other and in the relative positional relation thereof. CONSTITUTION:The stationary magnetic pole in the magnet roll 2 is rotationally moved via a link by the excitation of a solenoid 9 and the N3 magnetic pole 4 is so positioned as to come to the position where the magnetic pole nearly faces a regulating member 5 at the time of non-development. The developer 7 in this state cannot pass the gap between the front end of the regulating member 5 and a sleeve 6. The developer 7 sticking to the sleeve 6 surface of the magnet roll 2 is easily removed in this way to prevent the contact of the photosensitive body 8 and the developer 7.

9. 发明专利

JPH0429275A ELECTROPHOTOGRAPHIC PRINTER 失效
公开(公告)号：JPH0429275A
公开(公告)日：1992-01-31
申请号：JP13574390
申请日：1990-05-25
申请人： HITACHI KOKI KK
发明人： OGAWA TOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G15/16 , G03G15/00 , G03G15/20 , G03G15/24
摘要： PURPOSE:To prevent the defect of a printed image on fixing and transfer parts by adopting structure so that the driving roll of a transfer belt serves also as the pressure or heating roll of a fixing device. CONSTITUTION:The transfer belt 2 is supported with proper tension by the pressure roll 8 composed of an elastic body and an idler roll 6, and the function of the pressure roll 8 servers also as the function of the driving roll driving the transfer belt 2 and the function of the pressure roll thermally pressurizing and fixing an unfixed toner image. Therefore, the sheet carrying speed of a sheet carrying member 2 is equal to that of the heating roll 7 or the pressure roll 8, and simultaneously, a space for receiving and delivering a sheet carrying member 2 and the heating roll 7 or the pressure roll 8 of the fixing part is eliminated. Thus, the defect of an image on the transfer part and the disturbance of the unfixed toner image on the part of the heating roll 7 can be prevented.

10. 发明专利

JPH03266878A ELECTROSTATIC CLEANING DEVICE 失效
公开(公告)号：JPH03266878A
公开(公告)日：1991-11-27
申请号：JP6787490
申请日：1990-03-16
申请人： HITACHI KOKI KK
发明人： NISHINO SHINICHI , HARADA TOSHIMITSU
IPC分类号： G03G21/10 , G03G21/00
摘要： PURPOSE:To prolong a durable life by extending the length of the circumference of a conductive brush, making it into a belt shape, and driving it by means of plural rollers. CONSTITUTION:The conductive brush 2 is constituted so that a conductive fiber is planted on a flexible base material, turned by rollers 11 and 12 and cleans the face of a photosensitive body 1. In other words, a voltage is applied on the conductive fiber by a bias power source 9, via the rollers 11 and 12, and through the base material of the conductive brush 2, and residual toner on the photosensitive body 1 is mechanically and electrostatically cleaned. The toner attracted to the brush 2 comes in contact with a recovering roller 4 and is attracted by a bias voltage applied by a bias power source 10. Then, the attracted toner is carried to a blade 5 by the turning of the roller 4, scratched off, and ejected by a recovered toner ejecting screw 6.

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