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1. 发明专利

JP2002258606A DEVELOPING DEVICE USING ONE COMPONENT TONER 失效
公开(公告)号：JP2002258606A
公开(公告)日：2002-09-11
申请号：JP2001057692
申请日：2001-03-02
申请人： SHARP KK
发明人： SAKAI KOJI
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To prevent toner fixing on a roller when performing development by one component toner by means of a developing roller by adopting a regulating member of a roller structure to regulate a quantity of toner adhering to the developing roller, and to simultaneously stabilize electrostatic chargeability of toner. SOLUTION: A control roller 43 rotationally driven by the press-contact of a developing roller 41 which carries and transports one component toner to a photoreceptor 1 carrying an electrostatic latent, is provided to regulate the quantity of toner adhering to the developing roller 41. When a prescribed state is counted by a counter 53 which counts the development history of a developing device, variable control is performed to control the peripheral velocity of the control roller 43 slower than an initial state, and to increase a bias voltage Vb in an absolute value through the bias voltage control circuit 51 and the rotary driving control circuit 52 of the control part 50, respectively. Toner fixing on the control roller 43 can be suppressed by decreasing the peripheral velocity, and lowering of electrostatic chargeability is suppressed by increasing the bias voltage, thereby stable development can be maintained over the long term.

2. 发明专利

JP2001175136A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2001175136A
公开(公告)日：2001-06-29
申请号：JP35513299
申请日：1999-12-14
申请人： SHARP KK
发明人： SAKAI KOJI , YAMANAKA TAKAYUKI , INOUE ATSUSHI , MASUDA JITSUO
IPC分类号： G03G21/10 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a toner reclaiming device which allows generating the reclaimed toner of a good quality from remaining toner. SOLUTION: As the remaining toner recovered with a cleaning unit 6 has the concentration of an additive from the outside lower than that of a fresh toner, the remaining toner is temporarily stored in a recovered toner storing part 62 of a toner reclaiming part 61 and the remaining toner of a prescribed amount is transported to a high concentration toner storing part 64. Unused toner which has the concentration of the additive from the outside higher than that of the fresh toner is stored in the high concentration toner storing part 64, the remaining toner and the high concentration toner are mixed and stirred to product the reclaimed toner. Then, the reclaimed toner is transported to a fresh toner storing part 63, the reclaimed toner and the fresh toner are mixed and stirred to generate a mixed toner and the mixed toner is supplied to a developing part 4 and further supplied from the developing part 4 to an electrostatic latent image on a photoreceptor drum 1.

3. 发明专利

JP2001142285A ONE-COMPONENT TONER DEVELOPING DEVICE 失效
公开(公告)号：JP2001142285A
公开(公告)日：2001-05-25
申请号：JP32065899
申请日：1999-11-11
申请人： SHARP KK
发明人： SAKAI KOJI , YAMANAKA TAKAYUKI , INOUE ATSUSHI , MASUDA JITSUO
IPC分类号： G03G15/06 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To prevent toner from adhering to a developing roller and other members in the development with one-component toner by using a developing roller. SOLUTION: This developing device 4 is provided with a supply roller 42 driven to be rotated while keeping press-contact to supply the one-component toner to a developing roller 41 by carrying and feeding the toner to a photoreceptor 1 carrying an electrostatic latent image, a regulating roller 43 for regulating the toner supplied to the roller 41 to a fixed amount, and a cleaning roller 45 keeping press-contact with the supply and the regulating rollers. At the time of finishing a developing operation, the rotation of the roller 41 is stopped and the rotation of the rollers 42, 43 and 45 is maintained for a specified time in accordance with the stop control of the rotation of the roller 41, and then bias voltage is switched and controlled so that electric field received by the toner is reverse. Thus, the toner existing between the rollers 41, 42 and 43 is removed and the adhesion of the toner in a state that the device 4 is stopped is prevented.

4. 发明专利

JP2000305351A DEVELOPING DEVICE FOR ONE COMPONENT TONER 失效
公开(公告)号：JP2000305351A
公开(公告)日：2000-11-02
申请号：JP11161999
申请日：1999-04-20
申请人： SHARP KK
发明人： SAKAI KOJI , INOUE ATSUSHI , TATSUMI HIROSHI , YAMANAKA TAKAYUKI
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To make the size of a developing device small by efficiently removing toner that is remaining after developing on a developing roll where one component toner is carried and developing is carried out. SOLUTION: In this device, a feeding roll 42 is provided in pressurized contact with a developing roll 41 where the one component toner is carried and transported so that it comes into contact with the photoreceptor where an electrostatic latent image is carried. In addition, a removing rod 44 is provided to come into pressurized contact with the developing roll 41 from behind through an elastic plate 45 to eliminate the toner immediately after a developing range 46 where the developing roll 41 is faced to the photoreceptor 1 and the toner that is in a state where it is easily isolated from the developing roll 41 directly after developing is efficiently eliminated by the removing rod 44 with a small diameter. Furthermore, the device is made small by having the removing rod 44 installed close to the developing range 46 side.

5. 发明专利

JP2000284664A CLEANING DEVICE AND IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000284664A
公开(公告)日：2000-10-13
申请号：JP9461599
申请日：1999-04-01
申请人： SHARP KK
发明人： SAKAI KOJI , TAKENOUCHI KOICHI
IPC分类号： G03G21/10 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To reutilize toner in a proper condition while surely removing toner whose diameter gets small from the surface of an image carrier and to reduce running cost without deteriorating image quality. SOLUTION: This cleaning device 6 is equipped with a 1st recovering roller 61, a blade 62, a carrying roller 63, a 2nd recovering roller 64, power source parts 65 and 66 and a recovery container 67. Voltage whose polarity is reverse to the proper electrification polarity of the toner is applied to the rollers 61 and 64 from the power source parts 65 and 66. The surface of the photoreceptor drum 1 passing through a transfer position is made to abut on the blade 62 after it is opposed to the roller 61. After recovering the normal toner 9a remaining on the surface of the drum 1 as the reutilized toner by the roller 61, the toner 9b whose diameter gets small and which remains on the surface of the drum 1 is separated from the normal toner 9a as waste toner by the blade 62 and the rollers 63 and 64.

6. 发明专利

JP2000105499A DEVELOPING DEVICE 失效
公开(公告)号：JP2000105499A
公开(公告)日：2000-04-11
申请号：JP27469298
申请日：1998-09-29
申请人： SHARP KK
发明人： INOUE ATSUSHI , TATSUMI HIROSHI , YAMANAKA TAKAYUKI , SAKAI KOJI
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing device using an elastic blade suitable for the expanding of the assembling tolerance of the elastic blade for a developing roller, the stabilization of an elastic blade abutting load to secular or environmental change, the improvement of the degree of freedom of specific circular frequency setting and also the miniaturization of the developing device. SOLUTION: A rectangular hole 304 is formed in a width direction at an area between the developing roller 100 of the elastic blade 300 and the supporting end part 303 of an abutting part 302. Thus, since the fluctuation gradient of the line pressure (free end abutting load) of the abutting part 302 to the displacement (deflection) of a developer layer regulating member top end is suppressed to be small by reducing the geometrical moment of inertia, so that the assembling tolerance is expanded.

7. 发明专利

JPH1115263A DEVELOPING DEVICE 失效
公开(公告)号：JPH1115263A
公开(公告)日：1999-01-22
申请号：JP16388597
申请日：1997-06-20
申请人： SHARP KK
发明人： ISHII HIROSHI , TOYOSHIMA TETSURO , TATSUMI HIROSHI , SAKAI KOJI
IPC分类号： G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a highly-reliable developing device in which the structure for controlling a contact nip is simplified while absorbing a peripheral-speed difference due to a developing operation. SOLUTION: This device is provided with a developing roller 2 which rotates in contact with a photoreceptive drum 1, having a peripheral-speed difference between them. A contact-depth setting roller 9, which has a round external surface as a first abutting face and a round internal surface as a second abutting face and controls the depth of the contact of the developing roller 2 with the photoreceptive drum 1 so that it has a specific value, is idly mounted on each end of the shaft 3 of the developing roller 2. The round external surface and round internal surface of each of the contact-depth setting rollers 9 are made almost equal in peripheral speed to the surfaces of the corresponding members with which they abut.

8. 发明专利

JPH06180520A ELECTROPHOTOGRAPHIC DEVICE 失效
公开(公告)号：JPH06180520A
公开(公告)日：1994-06-28
申请号：JP33325092
申请日：1992-12-14
申请人： SHARP KK
发明人： TAKENOUCHI KOICHI , SAKAI KOJI
IPC分类号： G03G15/00 , G03G15/02 , G03G15/04 , G03G15/043 , G03G15/08 , G03G21/00
摘要： PURPOSE:To restrain the consumption of toner, to enhance toner yield, and to attain the target number of copies being the toner yield by reducing the stuck quantity of toner to a photosensitive drum. CONSTITUTION:This device is provided with a memory storing the set value of the number of image formed sheets, a control part judging whether or not the toner yield being the number of image formed sheets obtained per a toner bottle or a cartridge is smaller than the set value stored by the memory (S11) when a main body stops (S10) by lighting a toner depletion lamp (S9) and a control part controlling to make impressed voltage on a main charger which impresses electrostatic charging voltage on the photosensitive drum lower than an ordinary set value (S12) for the new toner when the control part judges that the toner yield is smaller than the set value.

9. 发明专利

JP2001109242A DEVELOPING DEVICE FOR ONE COMPONENT TONER 失效
公开(公告)号：JP2001109242A
公开(公告)日：2001-04-20
申请号：JP28632399
申请日：1999-10-07
申请人： SHARP KK
发明人： SAKAI KOJI
IPC分类号： G03G15/06 , G03G15/08 , G03G21/14
摘要： PROBLEM TO BE SOLVED: To prevent sticking of toner between a developing roll and feeding roll feeding toner to a developing roll when developing is carried out with the one component toner by utilizing the developing roll. SOLUTION: In this device, the feeding roll 43 that is rotated and driven in a pressurized contact to feed the toner to the developing roll 41 carrying and transporting the one component toner to the photoreceptor carrying an electrostatic latent image is provided. In this case, in order to carry out feeding to the developing roll 41 well, bias voltage is fed between the developing roll 41 and the feeding roll 42 so that an electric field works in a direction of attracting the toner to the developing roll side, bias voltage Vc that is fed to a restricting roll before a specified time when developing is completed is switched and controlled so that an electric field works in a direction where the toner is attracted to the feeding roll 42 side. Thus, the toner existing between the developing roll 41 and the feeding roll 43 after the developing is eliminated and the sticking of the toner generated in the part is prevented after the developing roll 41 is stopped.

10. 发明专利

JP2001051503A ONE-COMPONENT TONER DEVELOPING DEVICE 失效
公开(公告)号：JP2001051503A
公开(公告)日：2001-02-23
申请号：JP23020899
申请日：1999-08-17
申请人： SHARP KK
发明人： SAKAI KOJI , INOUE ATSUSHI , YAMANAKA TAKAYUKI
IPC分类号： G03G15/06 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To attain the roller constitution of a control member for controlling quantity of one-component toner sticking to a developing roller, in the case of developing with the one-component toner by the developing roller, and to prevent the toner from firmly sticking to the rollers. SOLUTION: The quantity of the toner sticking to the developing roller 41 is controlled by arranging the control roller 43 which is rotary-driven in press contact with the developing roller 41 for carrying the one-component toner to a photoreceptor on which an electrostatic latent image is formed. After developing is finished, a developing bias voltage Va supplied to the developing roller 41 is turned off, and the control roller 43 is controlled by a control part 50 so that the voltage may be switched and controlled to such a bias voltage that is equal to or below a discharge start voltage and for attracting the toner toward the control roller 43, and also, the control roller 43 may be continuously rotated. Then, the toner lying between the developing roller 41 and the control roller 43 after developing is scraped, and the toner is prevented from firmly sticking to the part.

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