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1. 发明专利

JP2002214942A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2002214942A
公开(公告)日：2002-07-31
申请号：JP2001015068
申请日：2001-01-23
申请人： RICOH KK
发明人： NAMEKATA SHINICHI , TAMIYA TAKAHIRO , WATANABE SHIGERU
IPC分类号： G03G15/00 , G03G15/01 , G03G15/14 , G03G15/16 , G03G21/14
摘要： PROBLEM TO BE SOLVED: To provide an image forming device capable of preventing the unevenness of image density caused by potential contrast on an intermediate transfer belt because of the direct application of separation bias without transfer-paper even in the case of using the intermediate transfer belt having a high resistance layer advantageous in terms of the prevention of transfer scattering. SOLUTION: By using the intermediate transfer belt 501 having the high resistance layer whose volume resistivity is >=1010 Ωcm, primary transfer from a photoreceptor drum 200 to the belt 501 is controlled so as not to primarily transfer the toner image on the drum 200 to a separation bias directly applying area S. When the peripheral length of the belt 501 is defined as Lbelt, and the length of transfer-paper P in the moving direction of the belt 501, a gap between the sheets of transfer paper to which the toner images are consecutively secondarily transferred and the applying distance of the separation bias per one circulation of the belt 501 are respectively defined as Lp, Lbwn and Lsep, they satisfy the expression (2×Lp+Lbwn)

2. 发明专利

JP2002214932A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2002214932A
公开(公告)日：2002-07-31
申请号：JP2001014669
申请日：2001-01-23
申请人： RICOH KK
发明人： WATANABE SHIGERU , NAMEKATA SHINICHI , TAMIYA TAKAHIRO
IPC分类号： G03G15/00 , G03G15/01 , G03G15/16 , G03G21/14
摘要： PROBLEM TO BE SOLVED: To provide an image forming device capable of preventing the unevenness of image density caused by potential contrast on an intermediate transfer belt when space between transfer paper and transfer paper passes through a secondary transfer position even in the case of using the intermediate transfer belt having a high resistance layer advantageous in terms of the prevention of transfer scattering. SOLUTION: By using the intermediate transfer belt 501 having the high resistance layer whose volume resistivity is >=1010 Ωcm, the current value of secondary transfer bias at the time of secondarily transferring a plurality of toner images consecutively formed on the belt 501 to the sheets of transfer paper P respectively different from each other is controlled so that the surface potential of the belt 501 passing through the secondary transfer position may be constant.

3. 发明专利

JP2001337517A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2001337517A
公开(公告)日：2001-12-07
申请号：JP2000154750
申请日：2000-05-25
申请人： RICOH KK
发明人： WATANABE SHIGERU
IPC分类号： G03G15/02 , G03G21/00
摘要： PROBLEM TO BE SOLVED: To provide an image forming device which can prevent the filming of a photoreceptor even when zinc stearate is used by dispersing the same into toners and can achieve the uniform electrostatic charge free of surface staining by poor electrostatic charge. SOLUTION: In the initial period of development when the photoreceptor filming is liable to occur, the applied current of the electrostatic charge is suppressed to a lower level and when the photoreceptor filming is least likely to occur and the poor electrostatic charge is liable to occur as time passes by, the applied current of the electrostatic charge is increased to prevent the surface staining by the poor electrostatic charge. Constant current control of 1.0 mA in AC component is carried out at a constant voltage of -600 V from the initial period of using a cartridge up to passing of 4,000 sheets. The constant current control of 1.3 mA in AC component is carried out after lapse of 4,000 sheets.

4. 发明专利

JP2001209206A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2001209206A
公开(公告)日：2001-08-03
申请号：JP2000020306
申请日：2000-01-28
申请人： RICOH KK
发明人： WATANABE SHIGERU
IPC分类号： G03G15/02 , G03G5/047 , G03G9/08 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide an image forming device capable of preventing the scattering of toner. SOLUTION: This image forming device 1 is equipped with a photoreceptor 3, an electrifying roller 5 uniformly electrifying the peripheral surface of the photoreceptor 3, a writing device 7 forming an electrostatic latent image on the electrified photoreceptor 3, a developing device 9 developing the electrostatic latent image as a toner image by superposing AC voltage on DC voltage so that flying development may be performed with toner, a transfer roller 11 transferring the toner image on the photoreceptor 3 to transfer paper, and a cleaning device 13 removing the toner remaining on the photoreceptor 3 after transfer. In the device 1, at least zinc stearate is added to the toner used in the device 9, and the photoreceptor 3 is equipped with a charge transportation layer 3a and the film thickness T of the layer 3a is set to

5. 发明专利

JP2000132003A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000132003A
公开(公告)日：2000-05-12
申请号：JP30716398
申请日：1998-10-28
申请人： RICOH KK
发明人： WATANABE SHIGERU
IPC分类号： G03G9/08 , G03G15/06 , G03G15/08 , G03G21/00 , G03G21/10
摘要： PROBLEM TO BE SOLVED: To provide an image forming device in which the cleanability of its image carrier is kept satisfactory and good images free from surface stain and transfer failure can be obtained from the early stage of output when the image carrier is new. SOLUTION: The image forming device has not only an image forming mode but also a zinc stearate application mode in which zinc stearate added to a single-component developer is transferred to the surface of a photoreceptor 1 serving as an image carrier by an electric field formed between the photoreceptor 1 and a developing roll 41 which carries the single-component developer on the surface and conveys it to a developing region. When the photoreceptor 1 is new, zinc stearate can be automatically applied to the surface of the photoreceptor 1 by actuating the zinc stearate applying mode to reduce the frictional force on the surface of the photoreceptor 1. Consequently, the newly installed photoreceptor is kept easily cleanable and good images free from surface stain and image transfer failure can be obtained from the early stage of image output.

6. 发明专利

JP2000019773A DEVELOPER FOR ELECTROPHOTOGRAPHY, AND IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000019773A
公开(公告)日：2000-01-21
申请号：JP20123698
申请日：1998-06-30
申请人： RICOH KK
发明人： WATANABE SHIGERU
IPC分类号： G03G9/08 , G03G9/083 , G03G9/087 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To form a superior transfer image, and to maintain cleaning performance for an image carrier, by adding zinc stearate in a developer. SOLUTION: 0.9-1.4 wt.% of silica for improving flowability is added to a toner of small particle size having 6-8 μm of average volume particle size, and then zinc stearate is added to it. Flowability of the toner is enhanced and cleaning property for the toner cleaned from a photoreceptor 1 is enhanced by this manner, so as to form a superior transfer image and to enhance cleaning performance for an image carrier.

7. 发明专利

JPH1124453A TRANSFER-ROLLER DETACHING STRUCTURE FOR IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1124453A
公开(公告)日：1999-01-29
申请号：JP19491197
申请日：1997-07-03
申请人： RICOH KK
发明人： YAMAGUCHI TOSHITAKA , TANAKA MASARU , MIZUISHI HARUJI , WATANABE SHIGERU , TATSUMI KENZO , SUDA TAKEO , YOSHINAGA HIROSHI , AMAMIYA MASARU , OHORI MAYUMI
IPC分类号： G03G15/16 , G03G21/16
摘要： PROBLEM TO BE SOLVED: To provide a transfer-roller detaching structure for an image forming device which makes it possible to detach a transfer roller from a transfer unit without touching the transfer roller. SOLUTION: A pair of through-holes 16 are made through the casing 1 of the transfer-and-separation unit and in positions corresponding to the roller part 2b of the transfer roller 2, mounted in the casing, or corresponding to core metals 2a exposed from both its ends. From the through-holes 16 the projections 18 of the jigs 17 are inserted, and the transfer roller 2 is pushed, thereby detaching it from the casing 1. In the case, the detached transfer roller is received by turning over the casing 1 and putting a box or the like under the casing 1.

8. 发明专利

JPH10333421A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH10333421A
公开(公告)日：1998-12-18
申请号：JP9202098
申请日：1998-04-03
申请人： RICOH KK
发明人： WATANABE SHIGERU , TANAKA MASARU , MIZUISHI HARUJI , TATSUMI KENZO , YAMAGUCHI TOSHITAKA , SUDA TAKEO , YOSHINAGA HIROSHI , AMAMIYA MASARU , OHORI MAYUMI
IPC分类号： G03G21/00 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To form a satisfactory image without the occurrence of toner drop and staining by detecting toner concentration after stirring developer for a prescribed time at the initializing of the developer, and performing an abnormality processing in the case the detection result is beyond the prescribed extent. SOLUTION: In the case the output value of the toner concentration detecting sensor 19 is >=0.5 V, the developer is already supplied to a developing device, then, a developer stirring operation is started by an image forming device control circuit 25. Simultaneously, a time counting operation is started by a timer 33. For the prescribed time, that is, until three minutes elapses, the developer is repeatedly stirred and also the output value of the toner concentration detecting sensor 19 is repeatedly detected. In the case the detected output value is not

9. 发明专利

JPH10307521A CLEANER 失效
公开(公告)号：JPH10307521A
公开(公告)日：1998-11-17
申请号：JP13032097
申请日：1997-05-02
申请人： RICOH KK
发明人： TANAKA MASARU , MIZUISHI HARUJI , TATSUMI KENZO , YAMAGUCHI TOSHITAKA , WATANABE SHIGERU , SUDA TAKEO , YOSHINAGA HIROSHI , AMAMIYA MASARU , OHORI MAYUMI
IPC分类号： G03G21/10 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To prevent bridging of a toner cover the wide area of a screw by generating the plural peaks of a swing by eccentricity when rotating the screw to discharge the toner outside a device. SOLUTION: When rotating a toner discharge screw 1 to discharge a recovered toner outside a device, a swing (f) by eccentricity having plural peaks p1 and p2 is generated, two-antinode vibration is generated with a central part between both end parts and a shaft 1a as the so-called node, and a bridging preventive range is expanded. In the toner discharge screw 1, a diameter of the shaft 1a is changed in several places, rigidity is changed between a thick diameter part and a thin diameter part arranged in two places, and a swing having the plural peaks is generated. By being constituted in this way, a peak- like part is generated in a boundary between the thick diameter part and the thin diameter part on both ends, a flat swing is generated between them, the swing is generated over the whole area of the shaft 1a, and the prevention of bridging becomes more effective.

10. 发明专利

JPH10186816A DEVELOPER CONTAINER 失效
公开(公告)号：JPH10186816A
公开(公告)日：1998-07-14
申请号：JP34096396
申请日：1996-12-20
申请人： RICOH KK
发明人： MIZUISHI HARUJI , TANAKA MASARU , WATANABE SHIGERU , YAMAGUCHI TOSHITAKA , TATSUMI KENZO , YOSHINAGA HIROSHI , SUDA TAKEO , AMAMIYA MASARU , OHORI MAYUMI
IPC分类号： G03G15/08 , B01D53/54 , B65D83/06
摘要： PROBLEM TO BE SOLVED: To prevent the adverse influence on the developer derived from ammonia gas by providing the ammonia removing member inside the developer container, and making the ammonia gas inside the developer container being absorbed. SOLUTION: This developer container 7 contains the developer 10 therein, while contains activated carbon 11 for removing the ammonia gas. The activated carbon 11 is fixed to the developer container 7 inside on a bottom part thereof via an adhesive. When the developer container 7 is fitted to the developing unit 2 upside down and a heat sealing 9 is pulled off, the developer 10 falls into the developing unit 2. The activated carbon 11 being fixed to the bottom part stays in the developer container 7, while performs remove of the ammonia gas in the developing unit 2, after the heat sealing 9 is pulled off. In this way, the ammonia gas inside the developer container 7 is reduced, while the activated carbon 11 is allowed to fulfill the removing work of the ammonia gas in the developing unit 2, and deterioration of an electrifying performance by the ammonia gas can be prevented.

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