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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 6859631 | Image forming apparatus and image forming method A switching timing condition for controlling the switching timing from first transfer bias during a non-transfer process to second transfer bias during a transfer process is recognized, and the switching timing of the transfer bias from the non-transfer process to t... | 02/22/2005 |
| 6859630 | Image transferring and recording medium conveying device and image forming apparatus including the same An image transferring and recording medium conveying device, for an image forming apparatus, which includes a nip between a belt and an image carrier for image transfer to a recording medium. A bias applying device applies a bias for image transfer to the nip. An im... | 02/22/2005 |
| 6832060 | Image forming apparatus and method for processing a plurality of toner colors onto a transfer medium An image forming apparatus and method that repeats image create/transfer processing, in which serial processing of forming a toner image on a photosensitive member while rotating the photosensitive member and a transfer medium in a sub scanning direction and thereaf... | 12/14/2004 |
| 6832059 | Image forming apparatus featuring dual polarity, multiple timing bias applying means An image formation apparatus includes: an image formation unit for forming toner images on a photosensitive drum; a transfer belt for transporting sheets of a transfer medium; an electrostatic transfer unit transferring toner images on the photosensitive drum onto t... | 12/14/2004 |
| 6829450 | Transfer bias applying method for an image forming apparatus and device for the same In an electrophotographic image forming apparatus of the type including a plurality of image carriers arranged along an image transfer belt and an image transferring device configured to transfer toner images of different colors from the image carriers to a sheet be... | 12/07/2004 |
| 6829449 | Image forming apparatus with transfer bias inverting function A transfer member transporting section is disposed so as to bring a tip end of a transfer member into contact with a peripheral face of a transfer rotary member before the tip end of the transfer member enters a nip area. A bias power supply has a polarity inverting... | 12/07/2004 |
| 6813453 | Method and apparatus for forming an image In the present invention, in an image forming apparatus for laminating images by using an intermediate transferring body, it is sensed that all toner images corresponding to image data for the same sheet material are formed on the intermediate transferring body in a... | 11/02/2004 |
| 6807385 | Difference potential preventing image forming apparatus An image forming apparatus capable of preventing generation of an excessive difference in potential between a cleaning member and an intermediate transfer member to thereby increase the service life of the intermediate transfer member, including an image bear... | 10/19/2004 |
| 6804481 | Image forming apparatus An image forming apparatus includes image forming device for forming an image on a first image bearing member, a transfer member, capable of contacting the first image bearing member, for transferring the image on the first image bearing member to a second image bea... | 10/12/2004 |
| 6801742 | Method and apparatus for producing duplex prints and image forming system using the same An image forming apparatus of the present invention includes a plurality of image carriers arranged along a first intermediate image transfer belt. Toner images of different colors formed on the image carriers are sequentially transferred to the first intermediate i... | 10/05/2004 |
| 6801728 | Image forming apparatus and image forming method An intermediate transfer belt having a plurality of layers including a conductive layer, and having transfer area and a transfer protection area. A CPU sends a control signal to a primary transfer bias generating circuit, and applies a primary transfer bias upon the... | 10/05/2004 |
| 6801727 | Recording-material type determination apparatus and method and image forming apparatus To provide a recording-material type determination apparatus and recording-material type determination method which can determine the type of recording material using simple calculations as well as to provide an image forming apparatus capable of obtaining stable im... | 10/05/2004 |
| 6801725 | Image forming apparatus An image forming apparatus includes: a photosensitive member; an intermediate transferring member to which an image formed on the photosensitive member is transferred; a press/release operation controlling section for controlling a pressing of the intermediate trans... | 10/05/2004 |
| 6795667 | Process cartridge and electrophotographic apparatus having an intermediate transfer belt A process cartridge which is detachably mountable to a main body of an electrophotographic apparatus, includes an electrophotographic photosensitive member to carry a toner image; an intermediate transfer belt having a contact part with the photosensitive member, an... | 09/21/2004 |
| 6792235 | Electrophotographic apparatus including transferring device A transfer flow-in current which flows from a transferring device into an image carrier, a separation flow-in current which flows from a separating device into the image carrier, an aperture width in the recording member transporting direction of an aperture of the ... | 09/14/2004 |
| 6792222 | Image formation apparatus for amplifying differences in potential for image and non-image sections of photo sensor A potential difference between a surface potential of a photo sensor and a surface potential of an intermediate transfer belt is set such that a discharging occurs at an image section and no discharging occurs at a non-image section. Once a discharging has occurred ... | 09/14/2004 |
| 6792219 | Transfer control for an image forming apparatus A transfer bias applying power supply 81 applies a transfer bias current of a fixed amount to a transfer roller 31 by executing a constant current control operation. A voltmeter 78 measures the amount of voltage generated by the transfer roller ... | 09/14/2004 |
| 6785502 | Image forming apparatus and method of preventing toner from transferring from image carrier to reverse surface of sheet An image forming apparatus of the present invention includes an image transferring device for transferring a toner image from an image carrier to a recording medium and a moving device for selectively moving the image transferring device toward or away from the imag... | 08/31/2004 |
| 6782227 | Transfer device for setting a suitable recording medium adsorbing bias, and an image-forming apparatus including the transfer device A transfer device that transfers color visual images of different colors from image carriers to each of first and second sides of a recording medium. The transfer device includes a transfer element that holds and moves the recording medium, transfer bias applying de... | 08/24/2004 |
| 6782215 | Electrophotographic printer An electrophotographic printer maintains a surface potential of a photosensitive drum at a constant value even when a photosensitive layer corresponding to a surface of the photosensitive drum wears down. The electrophotographic printer includes a charging power sup... | 08/24/2004 |
| 6775490 | Electrostatographic reproduction method and apparatus with improved start-up to substantially prevent transfer roller contamination An electrostatographic reproduction apparatus having a transfer assembly, including an electrically biased transfer roller in nip relation with a dielectric support member, for effecting transfer of a pigmented marking particle image from an image area of a dielectr... | 08/10/2004 |
| 6766137 | Apparatuses for color image formation, tandem color image formation and image formation The color image formation apparatus of the invention can include an image formation unit that is placed diagonally in relation to the vertical direction, a largest paper-feed tray that is placed below the image formation unit and feeds paper to image formation secti... | 07/20/2004 |
| 6766125 | Image forming apparatus A control unit uses electric field generating means (power supply) to effect a control to set a time period of alternate application of positive and negative bias voltages to a secondary transfer roller to be less than a time period corresponding to a single continu... | 07/20/2004 |
| 6766124 | Image forming apparatus and image forming method having speed control to improve throughput A CPU 111 drives an intermediate transfer belt at a first speed in a normal mode, but drives the intermediate transfer belt at the first speed in a low speed mode at least until the end of forming a toner image performed by a developer part 20, reduces... | 07/20/2004 |
| 6766123 | Image forming apparatus with detected-current transfer material charging voltage control feature An image forming apparatus includes a detected-current-controlled voltage charging device for charging a transfer material before a toner image is transferred to the transfer material by a transfer device. A current is produced when a voltage is applied to the charg... | 07/20/2004 |
| 6766122 | System and methods for calibrating a printing process The system and methods described herein relate to calibrating an electrophotographic (EP) printing process. Calibration patches are monitored before and after transfer and cleaning functions to provide information useful in adjusting an EP process to improve overall... | 07/20/2004 |
| 6763203 | Image forming apparatus having transfer bias control function The image forming apparatus has an image bearing member for transferring an image from the image bearing member to a recording material, a fixing device for fixing an image onto the recording material, the fixing device having a heating member and back-up roller for... | 07/13/2004 |
| 6757515 | Method and apparatus for image forming capable of performing a stable sheet transfer operation A sheet transferring apparatus for use in an image forming apparatus including a sheet transferring mechanism and a controller. The sheet transferring mechanism transfers a recording sheet at a transfer speed to an image forming mechanism in the image forming appara... | 06/29/2004 |
| 6741825 | Image forming apparatus and method An image forming apparatus which may form first and second visual images on first and second sides of a recording medium, includes a first image bearing member, a second image bearing member, a first transfer device that transfers the first visual image formed on th... | 05/25/2004 |
| 6738594 | Color image forming apparatus and control method thereof When a transfer and conveyance belt mechanism has already started moving and a recording sheet has just passed through a cyan color photoreceptor drum, photoreceptor drums for cyan, magenta and yellow colors have not yet abutted on the transfer and conveyance belt. ... | 05/18/2004 |
| 6735402 | Image forming apparatus with current-controlled transfer voltage feature An image forming apparatus includes an image bearing member and a transferring member for transferring a toner image on the image bearing member onto a recording material in a transferring portion of the image forming apparatus. When the recording material is not pr... | 05/11/2004 |
| 6735400 | Electrophotographic or ionographic printer with variable printing speed In a printer with an electrically chargeable image drum, such as a laser or a LED printer, for imprinting a medium by transferring toner to the medium, including, arranged around the image drum, a charging unit, a writing unit and a toner unit, the toner unit is dis... | 05/11/2004 |
| 6731891 | Transfer roll engagement method for minimizing motion quality disturbances A method of maintaining a rotational velocity of an imaging drum in an image producing device includes constructing a table of a drive current for a transfer roll for a plurality of first distances between the imaging drum with the transfer roll, and utilizing the t... | 05/04/2004 |
| 6731890 | Transfer of toner using a time-varying transfer station current An electrostatographic machine having a transfer station including a toner image carrier and a transfer member for electrostatic transfer of toner from the toner image carrier to a toner-image area on a receiver sheet in a nip formed between the toner image carrier ... | 05/04/2004 |
| 6728496 | Image forming apparatus An image forming apparatus has an image bearing member, a movable recording material carrying member and a transfer means for transferring the image from the image bearing member onto the recording material being carried by application of a transfer output having a ... | 04/27/2004 |
| 6724998 | Image forming apparatus with variable toning bias offset service utility An electrophotographic print engine has a variable primary charger and toning bias which places the machine in abnormal reproduction modes in order to provide service and diagnostic information to troubleshoot subsystems involved in the electrophotographic process. | 04/20/2004 |
| 6721517 | Image forming apparatus with control of start timing of application of transfer output An image forming apparatus has an image bearing member, a movable recording material carrying member, transferring means for transferring the image from image bearing member to the carrying member and a fixing unit. A control starts timing of application of a transf... | 04/13/2004 |
| 6721515 | Electrostatic transfer type image forming apparatus with control of start timing of transfer output An electrostatic image forming apparatus has an image bearing member, a movable recording material carrying member and a transfer unit for effecting electrostatic transfer of an image from the image bearing member onto a recording material being carried. A control i... | 04/13/2004 |
| 6708008 | Image forming apparatus and image forming method with transfer belt drive unit control A microcomputer processes count data counted by a CPU counter, and accumulates it in a RAM. The microcomputer always accesses the count data accumulated in the RAM and compares it with preset count data. Based on the comparison result, the microcomputer controls the... | 03/16/2004 |
| 6708017 | Image forming apparatus including controller to start driving movable body after image carrier An image forming apparatus of the present invention includes an image carrier whose surface is movable in a preselected direction while carrying a toner image thereon. A movable body has a surface movable in the same direction as the image carrier in contact with th... | 03/16/2004 |
