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| Number | Title | Issue Date |
| 7308221 | High developing voltage supply apparatus A high developing voltage supply apparatus includes solenoid power switches, and a high developing voltage driver selectively outputting a solenoid driving signal to close one of the solenoid power switches to electrically close a corresponding mechanical contact, a... | 12/11/2007 |
| 7095969 | Developing device A developing device has a voltage application member which is in contact via a toner layer with a developing roller that rotates while holding the toner layer on its outer peripheral surface. A voltage that the voltage application member applies to the toner layer i... | 08/22/2006 |
| 7079798 | Toner transfer back suppressing color image forming apparatus A multi color image forming apparatus includes a plurality of stations arranged side by side for forming unique mono-color toner images using mono-color developers each having a different mono-color toner. Each of the plurality of stations includes an image bearing ... | 07/18/2006 |
| 7076182 | Developing apparatus A developing apparatus includes a toner carrying member for carrying toner to a developing zone where the developing apparatus faces to an image bearing member; bias voltage applying means for applying to the toner carrying member a developing bias voltage for devel... | 07/11/2006 |
| 6845222 | IMAGE FORMING METHOD AND IMAGE FORMING APPARATUS FOR SUPPRESSING MOVEMENT OF DEVELOPER ONTO THE ELECTROSTATIC LATENT IMAGE CARRIER WHEN THE VOLTAGES APPLIED TO THE CHARGING AND DEVELOPING DEVICES ARE RAISED OR LOWERED An electrophotographic image forming apparatus having a photosensitive member 1, a charging roller 2 and a developing roller 31, and including an output variable power source 8 common to the charging and the developing rollers 2 an... | 01/18/2005 |
| 6507718 | Method and apparatus for reducing adhesion of carrier to image bearing member In an image forming apparatus having a reverse development system and using a two-component developer, respective potentials applied when charging an image bearing member and when applying a development bias to a developer bearing member are attenuated wh... | 01/14/2003 |
| 6353720 | Image developing device using a toner as a developer A developing device, includes; a developing roller supporting and conveying mono component toner to a photoreceptor having a static latent image; a supplying roller pressed against the developing roller and rotated so as to supply the toner to the develop... | 03/05/2002 |
| 6263178 | Method of applying a bias voltage for image development and method of switching the bias voltage in an image forming apparatus An image forming apparatus includes a plurality of image forming units each including a single image carrier, a single writing device and a plurality of developing means each including a single developing roller for developing a latent image formed on the... | 07/17/2001 |
| 6219499 | Developing apparatus and method of applying developing bias therefor In a developing apparatus of the present invention, a voltage applying circuit applies a developing bias voltage obtained by superimposing a DC component on an AC component to the developer carrying member. A bias voltage controller controls the voltage o... | 04/17/2001 |
| 5999777 | Image forming apparatus capable of temporarily breaking the contact between the developer and the photosensitive drum with use of electric field An image forming apparatus includes an image bearing member for bearing an electrostatic latent image; a first developing device for developing the electrostatic latent image on the image bearing member; a second developing device, faced to the image bear... | 12/07/1999 |
| 5970280 | Image forming apparatus having a developing bias control unit An image forming apparatus includes an image support which supports an electrostatic latent image on a surface of the image support. A developing unit has a developing agent support which retains a developing agent, including a toner and carriers, contain... | 10/19/1999 |
| 5956550 | Method and device for preventing formation of background image in electrophotographic image forming apparatus An electrophotographic image forming apparatus prevents the formation of a background image. The apparatus includes a photosensitive drum with a ground plate, and a power supply for applying a negative voltage to the ground plate in the case where the app... | 09/21/1999 |
| 5897243 | Electrophotographic recording apparatus configured to switch a bias voltage in a developing unit In an electrophotographic image recording apparatus of the type using a single-ingredient type developer, i.e., toner, a latent image is electrostatically formed on a photoconductive drum or similar image carrier. A developing unit has a developing roller... | 04/27/1999 |
| 5848337 | Electrical biasing scheme for preventing overplating in an image-on-image electrostatographic printing system A method and apparatus for eliminating undesirable development of background charge potentials in a multicolor electrostatographic system is disclosed, wherein the application of a developer bias at a given development station is selectively controlled to... | 12/08/1998 |
| 5826144 | Developing device for an electrophotographic recording apparatus including bias control of a toner supplying roller In an electrophotographic recording apparatus of the type using a single-ingredient type developer, i.e., toner, a developing device has a developing roller for conveying the toner deposited thereon, and an intermediate roller for conveying the toner tran... | 10/20/1998 |
| 5826146 | Color image forming device which changes developing bias when switching between developer units An image forming device includes a plurality of developing devices and a photosensitive drum. Each of the developing devices includes a developer carrying roller. One of the developing devices is moved to a developing position confronting the photosensiti... | 10/20/1998 |
| 5771423 | Image forming apparatus A voltage application timing control unit is connected to a DC component applying unit and an AC component applying unit in a developing bias applying unit. The voltage application timing control unit independently controls the DC component applying unit ... | 06/23/1998 |
| 5768665 | Image forming apparatus with bias control to prevent undesirable toner deposition In an image forming apparatus using a corona discharge type charging device and a contact type image transferring device, a toner deposited on a photoconductive element in the form of a black stripe is prevented from being transferred to the image transfe... | 06/16/1998 |
| 5671470 | Color image forming device which changes developing bias when switching between developer units An image forming device includes a plurality of developing devices and a photosensitive drum. Each of the developing devices includes a developer carrying roller. One of the developing devices is moved to a developing position confronting the photosensiti... | 09/23/1997 |
| 5627631 | Developer replenishing device and developer container for use therewith A developer replenishing device for replenishing a developing device with a developer, and a developer container for use therewith. The developer container, or toner bottle, has a mouth portion at one end thereof which is smaller in diameter than a hollow... | 05/06/1997 |
| 5572302 | Electrode wire positioning for scavengeless development An apparatus for supporting wires in a wire module for use in a scavengeless development system using wire maintaining members that longitudinally support the wires. The tops of the wire maintaining members have grooves that positively position the wires ... | 11/05/1996 |
| 5426487 | Image forming apparatus having bimodal charging means An image forming apparatus includes an image member which moves through a path past a series of stations. The series of stations create both first and second toner images on the same frame of the image member which images can be of different color. When t... | 06/20/1995 |
| 5404213 | Electrophotographic printing apparatus capable of printing images by electrophotographic processing and its start-up method To prevent spurious adherence of toner to the surface of a photosensitive drum during start-up of an electrophotographic printing apparatus, once rotation of the drum and charging of the drum surface to a predetermined potential are initiated, rotation of... | 04/04/1995 |
| 5270783 | Image forming equipment having improved toner sensing Image forming equipment having an image carrier and a developer carrier located face-to-face and forming an AC-superposed DC electric field between them to develop a latent image electrostatically formed on the image carrier. Sensors responsive to image f... | 12/14/1993 |
| 5253017 | Image forming apparatus An image forming apparatus capable of preventing a toner from depositing on non-charged part of an image carrier just after the start of an image forming operation even when implemented with a contact reversal development system and a contact charging sys... | 10/12/1993 |
| 5194901 | Image forming apparatus having means for preventing toner deposit on photosensitive member An image forming apparatus includes a movable photosensitive member; a toner image forming device for forming a toner image on the photosensitive member; a transfer device for electrostatically transferring the toner image from the photosensitive member t... | 03/16/1993 |
| 5155533 | Bias application control device for image forming equipment A device for controlling the application of a bias for development in electrophotographic image forming equipment which forms a latent image on a photoconductive element and develops it by a magnetic brush formed by a dry two-component developer on a deve... | 10/13/1992 |
| 5146285 | Image forming apparatus An image forming apparatus for forming a toner image on a recording medium. The apparatus includes a photosensitive drum on which a latent image is formed, a developing/cleaning device for developing the latent image with a developing agent and for removi... | 09/08/1992 |
| 5032870 | Electrophotographic apparatus An electrophotographic apparatus comprising a power supply, a detection means, a voltage control means, and an exposure unit control means, whereby the provision of a special discharge unit can be omitted to allow the reduction in the size and cost of the... | 07/16/1991 |
| 5003353 | Electrophotographic printer with developing unit employing two-component toning system A electrophotographic recording apparatus which delays the removal of a potential provided on the developer while the charges on the photosensitive surface are exposed to the developer. The apparatus includes a bias generator controlling which controls th... | 03/26/1991 |
| 4990961 | Electrophotographic apparatus with variable bias voltage An electrophotographic apparatus having: a developer unit that has a magnetic developing roller for applying toner to electrostatic latent image areas formed on the surface of a photoconductor and that has a shutter which is closed to regulate the distrib... | 02/05/1991 |
| 4984022 | Image forming apparatus having means for attenuating bias voltage of the developing sleeve An image forming apparatus including a photosensitive member, a developing sleeve for developing an electrostatic latent image formed on the photosensitive member by using a developer, and control means for controlling the application of bias voltage to t... | 01/08/1991 |
| 4984021 | Photoreceptor edge erase system for tri-level xerography The prevention of photoreceptor edge development by a discharged image area development system is accomplished by the provison of a photoreceptor charging device which uniformly charges the photoreceptor across its entire width, including the edges thereo... | 01/08/1991 |
| 4916491 | Control device for a copier In a relatively simple copier lacking a discharging unit which erases those portions of a photoconductive element which precede and follow an image, a control device reduces the amount of toner consumed and the amount of toner collected while preventing t... | 04/10/1990 |
| 4888621 | Multiple image forming apparatus with charger to prevent disturbance of already-transferred images In an image formation apparatus for sequentially forming toner images on an image carrier and transferring the toner images onto a transfer material on a transfer material support member which is moved in an endless manner, when the transfer material is b... | 12/19/1989 |
| 4811046 | Tri-level highlight color printing apparatus with cycle-up and cycle-down control Undesirable transient development conditions that occur during start-up and shut-down in a tri-level xerographic system when the developer biases are either actuated or de-actuated are obviated by the provision of developer apparatuses having rolls which ... | 03/07/1989 |
| 4809038 | Color electrophotographic apparatus and method A color electrographic apparatus is provided including a latent image forming device for forming plural electrostatic latent images respectively corresponding to image signals of different colors on the surface of a photoconductor, a plurality of toners o... | 02/28/1989 |
| 4791452 | Image forming apparatus having at least two-color image print function and method for controlling the same Single-colored image printing and multi-colored image printing are carried out by an image forming apparatus in response to color signals. The image forming apparatus includes an image carrier, a first image forming unit having a first developer wherein a... | 12/13/1988 |
| 4714942 | Reversal image development type electrophotographic printing system A reversal image development type electrophotographic printing system including a rotatable drum (1) coated with a light sensitive layer and an image developing roller (31) co-rotatable with the drum and using a printing medium composed of carriers and to... | 12/22/1987 |
| 4610528 | Electrophotographic copying machine with delayed development bias voltage application An electrophotographic copying machine comprises a developing device for visualizing an electrostatic latent image as a toner image by delaying applying a developing bias voltage between a magnet roller and a photoreceptor to prevent carriers of a develop... | 09/09/1986 |
