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81. 发明专利

JPH04145451A CARRIER FOR DEVELOPER 失效
公开(公告)号：JPH04145451A
公开(公告)日：1992-05-19
申请号：JP26914490
申请日：1990-10-05
申请人： HITACHI KOKI KK
发明人： YOKOYAMA TAKASHI , NISHINO SHINICHI
IPC分类号： G03G9/107 , G03G21/00
摘要： PURPOSE:To perform printing without causing the adhesion of carrier to a paper by allowing the carrier whose saturation magnetization, particle size and specific gravity are set at specified set values to float while impressing a specified voltage between a photosensitive body and a rotor with a sleeve where a magnetic pole is arranged and attaching a carrier particle whose saturation magnetization, particle size and specific gravity are smaller than the specified set values to the photosensitive body and removing it. CONSTITUTION:The carrier 1 whose saturation magnetization, particle size and specific gravity are specified set values are allowed to float while impressing the specified voltage between the rotor with the sleeve 3 where the magnetic pole 2 is arranged and the rotatable photosensitive body 4 which is arranged to be opposed to the rotor 3. The carrier particle whose saturation magnetization, particle size and specific gravity are smaller than the specified set value of the carrier 1 which is allowed to float is attached to the photosensitive body 4 or the rotors with a magnet and the sleeve 5 and 6 respectively set near the rotor with sleeve 3 and the photosensitive body 4. Then, the rest is attached to the rotor with sleeve for recovery 7 which is set below the photosensitive body 4 and provided with the magnetic pole and recovered, thereby obtaining the carrier 1a for the developer used for the development of electrostatic photography.

82. 发明专利

JPH0450976A DEVELOPING DEVICE FOR ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH0450976A
公开(公告)日：1992-02-19
申请号：JP15813290
申请日：1990-06-15
申请人： HITACHI KOKI KK
发明人： SAKAMOTO ATSUSHI , NISHINO SHINICHI , KIKUCHI TAKAHIRO
IPC分类号： G03G15/06 , G03G21/00
摘要： PURPOSE:To prevent the sticking of toners to a cap part by turning off the bias voltage to be impressed to a developing sleeve when the cap consisting of a conductive member faces the developing sleeve. CONSTITUTION:The cap part which consists of the conductive part and is provided in the aperture of a drum formed as a part for taking out photosensitive sheets and the non-image part of the photosensitive body 2 are maintained at the same potential. The bias voltage 6 to be impressed on the developing sleeve 4 is turned off by an on-off device 7 when the cap 1 faces the developing sleeve 4. Consequently, the electric field between the gap 1 and the developing sleeve 4 is kept larger than the image force of the cap 1. The sticking of the toners to the cap par 1 is prevented in this way.

83. 发明专利

JPH0442250A ELECTROPHOTOGRAPHIC PRINTING DEVICE 失效
公开(公告)号：JPH0442250A
公开(公告)日：1992-02-12
申请号：JP15121490
申请日：1990-06-08
申请人： HITACHI KOKI KK
发明人： OGAWA TOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G15/00 , G03G15/04
摘要： PURPOSE:To secure positional accuracy between an optical unit and a photosensitive unit by directly brining the respective unit into contact with each other at a point becoming a positional reference as the unit. CONSTITUTION:The photosensitive unit 8 consisting by turnably supporting a photosensitive drum is positioned in a main body frame 5 by pins 13 and 14 and fixed by a know. The optical unit 2 is mounted on the unit 8 at three accuracy adjusting parts. Then, the accuracy such as parallelism, torsional degree or height of respective two places of guide member 15 and a frame stay 16, which are provided on the frame 7 of a photosensitive body, with respect to the photosensitive drum is previously provided. On the other hand, the accuracy such as the parallelism, the torsional degree or the height of the respective rotating members 17 - 19 of the optical unit 2 is previously provided. Then, the optical unit 2 is pressed against the photosensitive unit 8 at three points by an energizing member 20. Thus, the positional accuracy between the photosensitive body and laser light is easily secured and printing quality is improved.

84. 发明专利

JPH0442248A ELECTROPHOTOGRAPHIC PRINTING DEVICE 失效
公开(公告)号：JPH0442248A
公开(公告)日：1992-02-12
申请号：JP15121990
申请日：1990-06-08
申请人： HITACHI KOKI KK
发明人： FURUHATA KAZUHIRO , FUJINUMA YOSHITAKA , KOBAYASHI JUNJI , OGAWA TOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G15/02
摘要： PURPOSE:To always keep the electrostatic charge potential of a photosensitive body uniform by moving a scorotron electrostatic charger in a direction that it is kept away from the photosensitive body and cleaning both grid surfaces on a side which is not faced to the photosensitive body and on a side which is faced to it. CONSTITUTION:The scorotron electrostatic charger constituted of a corona wire 2 generating corona discharge, a shielding case 3 and a grid 4 controlling the electrostatic charge potential of the photosensitive body 1 are provided. Besides, a grid cleaning member 5 is provided. Then, a means 6 which moves the scorotron electrostatic charger in the direction that it is kept away from the photosensitive body 1 when the grid is cleaned is provided and both grid surfaces on the side which is not faced to the photosensitive body and on the side which is faced to it are cleaned by the means 5. Thus, the electrostatic charge potential of the photosensitive body 1 is always kept uniform and printing quality is improved, besides.

85. 发明专利

JPH0429284A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH0429284A
公开(公告)日：1992-01-31
申请号：JP13575390
申请日：1990-05-25
申请人： HITACHI KOKI KK
发明人： SAKAMOTO ATSUSHI , HARADA TOSHIMITSU , KOBAYASHI JUNJI , OGAWA TOSHITAKA , NISHINO SHINICHI , NAKAMURA KIMIO , ANZAI MASAYASU
IPC分类号： G03G21/10 , G03G21/00
摘要： PURPOSE:To improve the cleanability of a cleaning device by disposing a corona generator, which faces a photosensitive body, between a transfer position and the cleaning device. CONSTITUTION:The corona generator 1 is disposed between a cleaning brush 3a which applies a positive DC bias and a transfer device 9 and faces a photosen sitive body 4. When the photo-sensitive body is negatively electrified as the power source of the corona generator 1, positive DC poser 10 is superposed on AC poser 2; and when the photosensitive body 4 is positively elecrified, negative DC power 11 is superposed on AC poser 2. Thus, the cleanability of the cleaning device 3 is improved.

86. 发明专利

JPH0429270A DEVELOPER FEEDING DISCHARGING MECHANISM 失效
公开(公告)号：JPH0429270A
公开(公告)日：1992-01-31
申请号：JP13574590
申请日：1990-05-25
申请人： HITACHI KOKI KK
发明人： FUJINUMA YOSHITAKA , NISHINO SHINICHI , NAKAMURA KIMIO
IPC分类号： G03G15/08
摘要： PURPOSE:To shorten a handling time spent on the developer replacing working of a maintenance parson or an operator by providing a mechanism discharging the developer from a developing machine, a container housing the developer, a tank storing a fresh developer, and a mechanism newly feeding the developer. CONSTITUTION:A printer main body counts the number of printing pages, and a printer displays a message so as to urge the operator to replace the developer when the prescribed number of pages is obtained. The operator carries out the discharging working of the developer by turning on a switch for exchanging the developer. In other words, a discharging valve 9 is opened, after the lapse of a prescribed time a closing action is carried out. Then, the measurement of the fresh developer is carried out, that is, a measuring valve 6 is opened, a measuring tank is made full, and then, the measuring valve 6 is closed. Then, a feeding valve 7 is opened to feed the developer of a necessary amount to the developing machine 1. This consecutive actions (sequence) are automatically controlled. Thus, the number of times of the exchanging working of the developer by the maintenance parson or the operator can be reduced.

87. 发明专利

JPH03217887A ELECTROSTATIC RECORDER 失效
公开(公告)号：JPH03217887A
公开(公告)日：1991-09-25
申请号：JP1257190
申请日：1990-01-24
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： UMEDA TAKAO , NAGATA TETSUYA , IKAWA TATSUO , NAKAMURA KIMIO , NISHINO SHINICHI , OGAWA TOSHITAKA
IPC分类号： G03G15/16 , G03G15/00 , G03G15/02 , G03G21/00 , G03G21/16
摘要： PURPOSE:To prevent toner from being wasted and the device from being contaminated by forming a specific dielectric film at the part of a photosensitive drum where a photosensitive body is not present. CONSTITUTION:A cap member 1 is treated thermally at about 560 deg.C, then the surface and flank are coated with aluminum enamel material paste of low- fusion-point glass uniformly and baked at 520-540 deg.C to form a dielectric aluminum enamel film 2 of 30 mum in film thickness, 53 in dielectric constant, and 10 -10 OMEGA.cm in volume resistivity. The parallel circuit of a capacitor 5 with o.01 muF capacity and a varistor 6 whose varistor operating voltage is 800V is connected to the aluminum enamel film 2. Thus, the dielectric film which has a

88. 发明专利

JPH03200278A PRE-TRANSFER ELECTROSTATIC DISCHARGING DEVICE OF ELECTRONIC CAMERA 失效
公开(公告)号：JPH03200278A
公开(公告)日：1991-09-02
申请号：JP34316289
申请日：1989-12-28
申请人： HITACHI KOKI KK
发明人： SAKAMOTO ATSUSHI , KOBAYASHI JUNJI , TOKORO HIROYOSHI , NISHINO SHINICHI , SUGANO KAZUO , NAKAMURA KIMIO
IPC分类号： G03G15/16 , G03G21/00 , G03G21/06
摘要： PURPOSE:To improve the transfer efficiency and reliability by providing a hood-shaped cover which prevents toner scattering in operation from sticking on a fade lamp filter. CONSTITUTION:The fade lamp filter 10a is fitted with the hood-shaped cover 11. The toner T scattering from a developing device 4 is therefore all cut off here, so it does not reach the fade lamp filter 10a, which can be held clean. Consequently, destaticization effect is improved, a form is prevented from being wound, and the maintenance cost is reduced without decreasing the irradiation quantity o the fade lamp to improve the transfer efficiency and reliability.

89. 发明专利

JPH03164756A ELECTROPHOTOGRAPHIC PRINTER 失效
公开(公告)号：JPH03164756A
公开(公告)日：1991-07-16
申请号：JP30504189
申请日：1989-11-24
申请人： HITACHI KOKI KK
发明人： OGAWA TOSHITAKA , NISHINO SHINICHI
IPC分类号： G03G15/20 , G03G15/00
摘要： PURPOSE:To improve the performance of a device to miniaturize the device and to reduce a cost by constituting a paper carrying path between a paper feeding hopper and a fixing device of a photosensitive body having a flat part, and driving a sheet only by means of the flat part of the photosensitive body. CONSTITUTION:The electrophotographic printer is provided with the paper feeding hopper 1, a mean picking up the sheet 2 from the paper feeding hopper 1, the photosensitive body 3 holding a toner image 5, a transferring unit 4 trans ferring the toner image 5 on the sheet 2, a carrying means having the carrying path of the sheet 2, and the fixing part 11 including a heat roll 8 and fixing the toner image 5 transferred on the sheet 2. The sheet carrying path between the paper feeding hopper 1 and the fixing part 11 is composed of the photosensi tive body 3, and the sheet 2 is driven only by the photosensitive body 3. Thus, the blurring in a transfer is prevented and the performance of the device is improved. A photosensitive body is used for carrying a sheet surving also as the sucking of the sheet for a transferring unit, so that a device is miniaturized and cost-down is attained.

90. 发明专利

JPS6383782A FLASH FIXING DEVICE 失效
公开(公告)号：JPS6383782A
公开(公告)日：1988-04-14
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
摘要： PURPOSE:To decrease a gas generating quantity by providing a device to control a toner image part region receiving both a first flash light and a next second flash light. CONSTITUTION:The toner image 11 of a recording paper 10 is flash-radiated when it passes through a lamp house 12 and fixed to the recording paper 10. When the toner image 11 is positioned to an overlapping part bn, a stain 13 occurs. When the operator of a printer equipped with a flash fixing device finds the stain and a function generator 3 is changed over by a switch 5, a light emitting period comes to be longer, the overlapping width bn is decreased, therefore, the abnormal generation of gas is eliminated, thereafter, the stain does not occur. Since a fixing strength reduction at the overlapping part bn is anxious in such a condition, the switch 5 is returned to a function generator 1 after printing executed to some extent. Thus, the gas generating quantity can be decreased and a lamp peripheral member such as a glass plate and the stain of the recording paper can be suppressed.

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