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1. 发明专利

JPH09138532A TRANSFER AND CARRYING DEVICE FOR IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09138532A
公开(公告)日：1997-05-27
申请号：JP31953995
申请日：1995-11-14
申请人： RICOH KK
发明人： MATSUDA ITARU , HARASAWA YUKO , MIYAMOTO KAZUE
IPC分类号： G03G15/00 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a transfer/carrying device for an image forming device capable of maintaining a stable control of toner density. SOLUTION: A density sensor A is installed on the position of a pre transfer process by a photoreceptor 2, and a density sensor B is installed on the post transfer position. After the start of rotating the photoreceptor 2, the base outputs VSGA and VSGB of the photoreceptor 2 with no sticking toner are respectively detected by the density sensors A and B. After the start of copying, a pattern output VSPA is detected by the density sensor A, and after the final copying, a pattern output VSPB is detected by the density sensor B. And the toner replenishing quantity is controlled based on the numerical relation between the output ratio of the base outputs VSGA and VSGB to the pattern outputs VSPA and VSPB, that is, VSPA/VSGA and VSPB/VSGB and a previously set specified value, and the toner replenishment is controlled so that the toner density may be always kept constant.

2. 发明专利

JPH0968871A TRANSFER/CARRIER BELT DEVICE 失效
公开(公告)号：JPH0968871A
公开(公告)日：1997-03-11
申请号：JP22510895
申请日：1995-09-01
申请人： RICOH KK
发明人： ISHII KOICHI , TAKANO SATOSHI , KUTSUWADA AKIO , MIZUISHI HARUJI , ITOU NORIYUKI , MATSUDA ITARU , HARASAWA YUKO
IPC分类号： G03G15/14 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To prevent the generation of an abnormal image at the time of separating a transfer paper by providing a grounded spur in the part facing a transfer exit guide plate across a transfer paper carrying path, in the vicinity of a position where the transfer paper is separated from a transfer belt. SOLUTION: The transfer belt 101 is moved in the carrying direction of the transfer paper, at the position facing a photoreceptor 1, by the rotation of a driving roller 102. At this time, a spur 104 is provided in the part, facing the transfer exit guide plate across the transfer paper carrying path, of the vicinity of the position where the transfer paper is separated from the transfer belt 101. The distance between the outer peripheral part of the spur 104 and a transfer paper carrying surface is set in accordance with the deflection of the transfer paper, in the vicinity of the transfer paper separating part of the belt 101 and the spur 104 is grounded not to store the charges of the transfer paper in the spur 104. Thus, the property of carrying the transfer paper when it is separated from the transfer belt is stabilized and even if residual charges are moved, a certain or more gap can not be generated between the transfer belt and the transfer paper.

3. 发明专利

JPH08194395A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH08194395A
公开(公告)日：1996-07-30
申请号：JP7721695
申请日：1995-03-08
申请人： RICOH KK
发明人： ISHII KOICHI , TAKANO SATOSHI , KUTSUWADA AKIO , MIZUISHI HARUJI , ITOU NORIYUKI , MATSUDA ITARU , HARASAWA YUKO , NAKATANI MASAHIDE
IPC分类号： G03G15/00 , G03G15/16 , G03G21/06
摘要： PURPOSE: To provide an image forming device capable of maintaining an excellent state by detecting resistance and its unevenness in the cylindrical direction of a transfer belt, for facilitating its selection and correcting a resistance value, for reducing the resistance unevenness, in an image forming device using a contact type transfer system. CONSTITUTION: The image forming device is provided with the transfer belt which is constituted of a dielectric and capable of coming into contact with the outer periphery of an image carrier, a means driving the transfer belt, a charge applying means for directly applying a charge to the transfer belt, a destaticization member 7 for destaticizing the belt and means 24 for detecting a current flowing in the destaticization member 7. In the image forming device constituted in such a manner that the destaticization member 7, the current detecting means 24 and the charge applying means are arranged in a direction perpendicular to the rotational direction of the transfer belt, plural insulators extended in the peripheral direction of the destaticization member 7 are provided in the cylindrical direction, so that the member 7 is divided into plural destaticization parts and the current detecting means 24 are provided in the destaticization parts respectively, to detect the current of the each destaticization part, at the time of stopping a driving belt.

4. 发明专利

JPH08160780A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH08160780A
公开(公告)日：1996-06-21
申请号：JP30224694
申请日：1994-12-06
申请人： RICOH KK
发明人： HARASAWA YUKO , MATSUDA ITARU , TAKANO SATOSHI , ISHII KOICHI
IPC分类号： G03G15/16 , G03G21/06
摘要： PURPOSE: To make possible easily cleaning the inverse charged toner stuck on an image carrier or a transfer belt and to prevent the rear side soiling or the separation failure of a transfer paper from causing. CONSTITUTION: As for the image forming device provided with the developing means 20 for forming the toner image by developing the electrostatic latent image on the image carrier 1, the transfer means 8 for transferring the toner image on the transfer paper P while being contact with the image carrier 1, the transfer bias applying means 5 for applying the bias voltage to the transfer means 8 at the time of transferring and the contact plate 7 for permitting the electric current form the transfer means 8 to flow to the grounding, the transfer bias voltage applied by the transfer bias applying means 5, in the non-image area in between the transfer paper P, is decided corresponding to the transfer bias voltage applied to the image area.

5. 发明专利

JPH08146788A TRANSFER SEPARATING DEVICE 失效
公开(公告)号：JPH08146788A
公开(公告)日：1996-06-07
申请号：JP28190194
申请日：1994-11-16
申请人： RICOH KK
发明人： HARASAWA YUKO , ISHII KOICHI , TAKANO SATOSHI , KUTSUWADA AKIO , MIZUISHI HARUJI , ITOU NORIYUKI , MATSUDA ITARU
IPC分类号： G03G15/16 , G03G21/10
摘要： PURPOSE: To excellently perform the cleaning of a transfer device by providing a contact electrode capable of applying the transfer bias to the transfer means and cleaning the transfer means while coming in contact with the outer periphery of the transfer means, and statically cleaning the transfer means. CONSTITUTION: In the transfer separating device 15, the transfer belt 17 is disposed below the photoreceptor drum 11, and the transfer belt 17 is driven by the driving roller 18 in the reverse direction of the rotary direction of the photoreceptor drum 11. The contact electrode consisting of the roller 22 is held in contact with the outer periphery of the transfer belt 17 in the vicinity of the driving roller 18 placed on the downstream side of the transfer nip part B butting to the photoreceptor drum, the roller 22 is connected to the high voltage power source 23, and the electric current It is supplied from the high voltage power source 23. The roller 22 is the contact electrode for applying the transfer bias to the transfer belt 17 and cleaning the transfer belt 17, and the toner stuck on the roller 22 is scraped off by the blade 24 and falls in the toner recovering container 25.

6. 发明专利

JPH07210002A TRANSFERRING AND TRANSPORTING DEVICE 失效
公开(公告)号：JPH07210002A
公开(公告)日：1995-08-11
申请号：JP583994
申请日：1994-01-24
申请人： RICOH KK
发明人： TAKANO SATOSHI , ARAI MAKOTO , KONSHIYA MASAKUNI , MATSUDA ITARU , HARASAWA YUKO , ISHII KOICHI
IPC分类号： G03G15/16
摘要： PURPOSE:To decrease pulling load on a formed film layer and to prevent cracking of an elastic material belt by forming the film layer having a low friction coefft. on the previously stretched elastic material belt. CONSTITUTION:The inside surface layer 6a of the transfer belt 6 is formed of a rubber belt and the surface layer 6b is composed of a fluororesin which is a hard material having the low friction coefft. The surface layer 6b is formed by a method of applying the liquid fluororesin on the surface of the rubber belt stretched to the state of use in which the belt is wound around rollers 4 and 5 or extending the belt to the state of use in which the belt is wound around the rollers 4 and 5 while maintaining the heat insulating state of the belt by heating the rubber belt and applying the fluororesin on its surface, then drying the coating. Then, the surface layer 6b is formed on the previously stretched inside surface layer 6a and, therefore, even if the belt 6 is put on the rollers 4 and 5 at the time of using the transferring belt 6 made of rubber, the pulling load acting on the surface layer 6b is lessened and the crack of the surface layer 6b is prevented.

7. 发明专利

JPH052337A TONER REPLENISHMENT CONTROL METHOD AND IMAGE FORMING DEVICE USING THE SAME 失效
公开(公告)号：JPH052337A
公开(公告)日：1993-01-08
申请号：JP4097091
申请日：1991-02-12
申请人： RICOH KK
发明人： ISHIGAKI KOJI , HARASAWA YUKO
IPC分类号： G03G15/00 , G03G15/08 , G03G15/36
摘要： PURPOSE:To keep image density larger than a lowest image density and to prevent toner or carrier from spilling even when the electrostatically charged quantity of the toner is changed with the lapse of time in a device where a developing device is replenished with the toner in accordance with a toner sticking total area on a photosensitive body by using image data in an image area. CONSTITUTION:Output from an optical sensor that detects the toner sticking at on the photosensitive body is converted into data at step 1. By comparing the data with a constant 25 corresponding to specified density at a step 2, a 1st replenishing mode in which the developing device is replenished with the toner corresponding to toner consumption being the product of the toner sticking quantity total area and the specified toner sticking rate MA, and a 2nd replenishing mode in which the device is replenished with the toner which is a specified quantity more than that in the 1st mode are selected. The 1st replenishing mode is realized with steps 4, 5 and 6, and the 2nd replenishing mode is realized with steps 3, 5 and 6. In the 2nd replenishing mode, toner concentration is increased and the electrostatically charged quantity of the toner is reduced, thereby the image density is improved.

8. 发明专利

JPH04360175A TONER CONCENTRATION CONTROL METHOD 失效
公开(公告)号：JPH04360175A
公开(公告)日：1992-12-14
申请号：JP13657791
申请日：1991-06-07
申请人： RICOH KK
发明人： HARASAWA YUKO , ISHIGAKI KOJI
IPC分类号： G03G15/00 , G03G15/06 , G03G15/08 , G03G21/00
摘要： PURPOSE:To prevent the occurrence of the sticking of toner and a carrier by successively and repeatedly forming the latent images of plural different reference patterns for controlling a toner concentration on a toner carrier at equal intervals, plural times. CONSTITUTION:The latent images of plural different reference patterns for controlling the toner concentration (P-pattern), are successively and repeatedly formed on a photosensitive drum 11, at equal intervals, plural times. The reference pattern for controlling the toner concentration is composed of reference patterns 1 and 2, for instance. When the toner concentration is detected, the latent image of the reference pattern for controlling the toner concentration is formed on the photosensitive drum 11, and developed with a two-component developer by a developing unit, to obtain an actual image, and the density of the actual image is optically detected by an optical type sensor 18. At this time, the reference patterns 1 and 2 are alternately formed on the photosensitive drum 11. Therefore, a variation in the result of the detection caused by a difference in the toner concentration and a change in a toner electrifying quantity while the developer is stirred, is averaged and the toner concentration can be accurately controlled.

9. 发明专利

JPH04204777A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH04204777A
公开(公告)日：1992-07-27
申请号：JP33764990
申请日：1990-11-30
申请人： RICOH KK
发明人： HARASAWA YUKO
IPC分类号： G03G21/00 , G03G15/00 , G03G15/08
摘要： PURPOSE:To prevent the formation of a faint image due to the degradation of image density by increasing a toner replenishing quantity compared with that of a normal copying mode when a white-and-black inversion mode is set. CONSTITUTION:This image forming device is provided with a control part 9 whose output side is connected with a supplying member 6 and the driving part of a replenishing roller 7, and input side is connected with a white-and- black inversion mode changeover switch 10 and an optical detecting member 11 detecting a reflection density from a density reference pattern formed on a photosensitive body. When the white-and-black inversion mode changeover switch 10 is set to an inversion mode, and the ratio (VSP/VSG) of detection output (VSP) corresponding to the reflection density from the density reference pattern and reflection density detection output (VSG) on a nonimage part on the photosensitive body is made high with respect to a prescribed value, the control part 9 judges that the consumption of toner is increased, and sets the rotation of the replenishing roller 7 in a direction where the toner replenishing quantity is increased. Thus, even if copying is carried out, the constant image density can be obtained without reducing a toner concentration.

10. 发明专利

JPH04170868A IMAGE-FORMING DEVICE 失效
公开(公告)号：JPH04170868A
公开(公告)日：1992-06-18
申请号：JP29857690
申请日：1990-11-02
申请人： RICOH KK
发明人： SHOJI HISAFUMI , KUROKAWA JUNJI , HARASAWA YUKO , OGAWA TOMOKO
IPC分类号： H04N1/393 , H04N1/40 , H04N1/409
摘要： PURPOSE:To convert the density of an image element and to maintain the image of high quality by converting an image signal into an image signal consisting of the image elements of high quality, which corresponds to an enlarging mode, and executing a smoothing processing when an enlarging mode is instructed. CONSTITUTION:An image processing means 102 receiving the image signal which an image read means 101 outputs is caused to convert the image signal into the image signal consisting of the image element of high density, which corresponds to the enlarging mode, and to execute the smoothing processing. An image data signal outputted from a gamma correction circuit 120 executing a processing so that the inputted image data signal fits to the recording feature of an image recording part 103 is temporarily stored in a line memory 121 and is written into an appropriate address in accordance with a control signal. Thus, an oblique line becomes smooth even if the image is enlarged and jaggy or the like are cancelled.

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