专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2002341695A IMAGE FORMING APPARATUS 失效
公开(公告)号：JP2002341695A
公开(公告)日：2002-11-29
申请号：JP2001149544
申请日：2001-05-18
申请人： RICOH KK
发明人： TABUCHI TAKESHI
IPC分类号： G03G15/00 , G03G21/00 , G03G21/14
摘要： PROBLEM TO BE SOLVED: To provide an image forming apparatus which can secure the uniformity of coating amount of a lubricant applied to the surface of an image carrier with a comparatively simple and inexpensive structure and can maintain a stable image quality. SOLUTION: The image forming apparatus is provided with a means to variably control on-off timing of a rotation of a coating brush 2 by counted value of the number of times of image formation or circulation time of a photoreceptor belt 1. Moreover, the on-off timing of the rotation of the coating brush 2 is variably controlled with a duty ratio in which the time that does not at least become an integral ratio to the time required for one round of circulation of the photoreceptor belt 1 is made 100%. Further, when the photoreceptor belt 1 does not circulate, rotational operation of the coating brush 2 is turned off.

2. 发明专利

JP2002244516A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2002244516A
公开(公告)日：2002-08-30
申请号：JP2001016771
申请日：2001-01-25
申请人： RICOH KK
发明人： SATO TOSHIYA , TABUCHI TAKESHI
IPC分类号： G03G15/02 , G03G21/10
摘要： PROBLEM TO BE SOLVED: To solve a problem that the filming and the melt sticking of toner remarkably occurs on the surface of a photoreceptor when applied voltage to an electrifying member is voltage obtained by superposing AC voltage on a DC component. SOLUTION: This image forming device is provided with the electrifying member 1 which is arranged proximately to the surface to be electrified of a rotatable photoreceptor 2 and to which the voltage obtained by superposing an AC component on the DC component is applied so as to electrify the photoreceptor 2, and is equipped with lubricant applying means 25 and 26 driven to be rotated by a rotating and driving means so as to apply lubricant to the photoreceptor 2.

3. 发明专利

JP2001331015A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2001331015A
公开(公告)日：2001-11-30
申请号：JP2000152620
申请日：2000-05-24
申请人： RICOH KK
发明人： TABUCHI TAKESHI
IPC分类号： G03G15/02
摘要： PROBLEM TO BE SOLVED: To provide an image forming device making a gap between an electrostatic charging member and a surface to be charged possible to be stably held, by restraining stress as the result of contact with the image carrier. SOLUTION: In this image forming device, an insulating tape 20 of the appropriate width is adhered as a contact member, on both left and right sides with regard the rotary direction becoming to a non image forming area, on a surface of a photoreceptor belt 10. The device holds a gap between the photoreceptor belt 10 and the surface to be charged, by means of coming into contact an electrostatic charging roller 11 as a charging member by the energizing force of a presser spring 17, with the contact member.

4. 发明专利

JP2000089545A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000089545A
公开(公告)日：2000-03-31
申请号：JP25621298
申请日：1998-09-10
申请人： RICOH KK
发明人： TABUCHI TAKESHI
IPC分类号： G03G15/02 , G03G21/14
摘要： PROBLEM TO BE SOLVED: To maintain the uniformity of electrification over a long period of time by preventing perpetual deformation of the brush portion of an electrifying brush roller. SOLUTION: To prevent perpetual deformation of the brush portion 2b of the electrifying roller 2 by performing an electrifying process in such a manner that each time a count number obtained by counting with a print counter 23 which counts sheets subjected to image formation reaches a specific count number the direction of the rotation of the electrifying brush roller 2 is selectively changed to either the arrow B showing the normal direction with respect to the direction of the rotation of a photoreceptor 1 or the arrow C showing the opposite direction to it.

5. 发明专利

JPH1090981A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH1090981A
公开(公告)日：1998-04-10
申请号：JP32468496
申请日：1996-11-20
申请人： RICOH KK
发明人： TABUCHI TAKESHI
IPC分类号： G03G15/02 , G03G21/00 , G03G21/14
摘要： PROBLEM TO BE SOLVED: To provide an image forming device capable of maintaining stable charging function for a charging member for a long time. SOLUTION: When a copy start key is pressed, a solenoid 10f is switched ON and a charging roller 2 is brought into contact with a photosensitive drum 1 so as to charge the surface of the photosensitive drum. When a copying process is finished, the solenoid 10f is switched OFF and the charging roller 2 is removed from the photosensitive drum 1 to be brought into contact with a cleaning pad 11. In this condition, the charging roller 2 is rotated at a specified speed for a specified time and cleaning is performed. Herein, if the number of times of continuously forming images is large, a cleaning time is extended, or the rotating speed of the charging roller 2, that is, a cleaning speed is increased. Thus, cleaning is assured.

6. 发明专利

JPH09311530A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09311530A
公开(公告)日：1997-12-02
申请号：JP14870496
申请日：1996-05-20
申请人： RICOH KK
发明人： TABUCHI TAKESHI
IPC分类号： G03G15/02 , G03G15/00
摘要： PROBLEM TO BE SOLVED: To provide an image forming device capable of holding the surface potential of a photoreceptor at a fixed value by always setting/applying a proper electrifying voltage to an electrifying roller in accordance with ambient temperature and humidity. SOLUTION: A temperature detecting sensor 20 detects the temp. of the electrifying roller 2 electrifying the photoreceptor 1, and a microcomputer 50 selects one of two kinds of temperature correction characteristics, based on the detected temperature. Then, a voltage corrected with the selected temperature correction characteristic is applied to the electrifyied roller 2 as an electrifying voltage, the photoreceptor 1 is electrifying by the roller 2, based on the electrifying voltage and the microcomputer 50 stores the previous temp. detected during the time when power is turned off. In such a case, when the temp. detected during the time when the power is supplied is within a fixed temperature range with respect to the previous temp. detected just before the power is turned off, the setting control of the electrifying voltage is executed with the previous temperature correction characteristic and the photoreceptor 1 is electrified at the proper electrifying voltage, according to the temp. and humidify in the environment of the device. Thus, the formation of an image of high quality, without being adversely affected by the sudden turning on/off of a main switch can be attained without the influence of an environmental condition.

7. 发明专利

JPH09265228A ELECTRIFYING MEMBER AND ITS PRODUCTION 失效
公开(公告)号：JPH09265228A
公开(公告)日：1997-10-07
申请号：JP7293796
申请日：1996-03-27
申请人： RICOH KK
发明人： KUROKAWA JUNJI , TABUCHI TAKESHI
IPC分类号： G03G15/02 , F16C13/00 , G03G15/16
摘要： PROBLEM TO BE SOLVED: To prevent production of transverse stripes on a transferred image due to scratches on the surface of a photoreceptor. SOLUTION: In the electrifying member 1 having an elastic layer 102 and a surface layer 103 which covers the surface of the elastic layer, the surface layer 103 is produced by dispersing a hydrophobic silica and a low structure type acetylene black which can be easily dispersed in an alcohol in a copolymer nylon resin which is soluble with an alcohol. In the surface layer 103, the amt. of the acetylene black dispersed is larger in the area near the elastic layer 102, while the amt. of silica dispersed increases with the distance from the elastic layer 102. This layer 103 is formed by repeatedly applying solns. of different blending ratios of the acetylene black and the silica to the copolymer nylon resin in several times.

8. 发明专利

JPH0954477A ELECTRIFYING ROLLER 失效
公开(公告)号：JPH0954477A
公开(公告)日：1997-02-25
申请号：JP20891295
申请日：1995-08-16
申请人： RICOH KK
发明人： KUROKAWA JUNJI , TABUCHI TAKESHI
IPC分类号： G03G15/02
摘要： PROBLEM TO BE SOLVED: To prevent electric inhomogeneity and to eliminate irregular electrification produced when only DC voltage is applied, by controlling the proportion of carbon black in a surface layer to be larger than the proportion of carbon black in an elastic layer. SOLUTION: This electrifying roller has at least two layers of an elastic layer and a surface layer which covers the elastic layer. The proportion of carbon black in the surface layer is controlled to be larger than the proportion of carbon black in the elastic layer. The elastic layer consists of an epichlorohydrin rubber, while the surface layer consists of an alcohol-soluble copolymer nylon resin and carbon black. The proportion of the carbon black to the nylon resin component in the surface layer is controlled to be larger than the proportion of the carbon black to the epichlorohydrin rubber component in the elastic layer. Moisture dependence of the resistance can be thereby suppressed low and changes in the electrification characteristics due to the environment can be decreased.

9. 发明专利

JPH08110680A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH08110680A
公开(公告)日：1996-04-30
申请号：JP24537594
申请日：1994-10-11
申请人： RICOH KK
发明人： TABUCHI TAKESHI
IPC分类号： G03G15/02 , G03G15/00 , G03G21/00
摘要： PURPOSE: To enable optimum electrification just after a transfer paper jammed during an image forming operation is removed and the image forming operation is resumed. CONSTITUTION: When the jam of the fed transfer paper P is detected by a jam detecting means 37, a contact/uncontact means for detecting a temp. 39 actuates a solenoid 45 and a temperature detecting sensor 20 separated from an electrifying roller 2, at the time of forming an image is brought into contact with the surface of the electrifying roller 2. Therefore, heated air in a machine escapes to its outside by the opening of the cover of a device, at the time of processing the jam, so that even if an atmospheric temp. in the vicinity of the temperature detecting sensor 20 in the machine is suddenly dropped, the sensor 20 directly and accurately detects the temp. of the surface of the electrifying roller 2, in the contact state therewith, to apply an optimum voltage corresponding to the detected temp. to the electrifying roller 2.

10. 发明专利

JPH07128956A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH07128956A
公开(公告)日：1995-05-19
申请号：JP27701793
申请日：1993-11-05
申请人： RICOH KK
发明人： MIYASHITA YOSHIAKI , TABUCHI TAKESHI , YAMAZAKI KOICHI , KIKUCHI NORIO , MATSUMOTO KENTARO , TAKAHASHI SADAO , HAYAKAWA NAOSHI
IPC分类号： G03G15/02 , G03G21/00 , G03G21/10 , G03G21/14
摘要： PURPOSE:To achieve extremely-steady, uniform electrification which prevents an occurrence of an image defect over a long period of time. CONSTITUTION:The device is equipped with a controller 30 for ordinarily keeping a cleaning member 22, used for cleaning the surface of an electrifying roller 2 which is in contact with a photoreceptor 1, apart from the surface of the roller 2, and for allowing the contact of the cleaning member 22 with the electrifying roller 2 only for a fixed time by driving a cleaning member contact/ separation mechanism 10 at each timing, at prescribed time-intervals. Thus, because excessive cleaning of the electrifying roller 2 by means of the cleaning member 22 is eliminated, an occurrence of an image defect can be prevented. Also, sudden soiling of the electrifying roller 2 can be handled by providing a means for detecting the degree of the soil of the surface of the electrifying roller 2, and by varying the timing that the cleaning member 22 is brought into contact with the roller 2, according to the degree of the soil.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式