Entries |
Document | Title | Date |
20080240754 | IMAGE FORMING SYSTEM AND METHOD OF DETECTING COLOR MISREGISTRATION - An image forming system, in which a method of detecting a misregistration of a color image is performed, includes multiple image carriers, an optical writing unit, a transfer member extended by a drive roller and at least one driven roller, a rotation detector, a roller driving unit, a belt controller, an image detector configured to detect the images formed on the surface of the transfer member and obtain detection data, and a controller configured to calculate an amount of misregistration and correct relative misregistration of a scanning line between the image carriers based on a result of the calculation. In the image forming system, a distance from a transfer position to a detection position is an integer multiple of a travel distance of the transfer member during one revolution of the at least one driven roller. | 10-02-2008 |
20080247769 | IMAGE FORMING APPARATUS - An image forming apparatus capable of keeping reproducibility and gradation in balance and outputting high-quality images. A primary electrostatic charger charges a photosensitive drum. A polygon scanner irradiates the drum with a laser beam to form an electrostatic latent image on the drum. A developing device develops the latent image into a toner image by applying a developing bias to the drum. In performing development by the developing device at a preset environmental contrast potential, a CPU determines a required contrast potential for obtaining a target maximum density. The CPU compares between the environmental contrast potential and the required contrast potential. Further, the CPU sets an upper limit value for a set contrast potential to be set to the developing device according to the result of the comparison, and sets an output level of the laser light to be output from the developing device. | 10-09-2008 |
20090169225 | Driving control device and image forming apparatus including the same - A driving control device for use in an image forming apparatus includes a control unit that analyzes any one of a speed variation pattern and a thickness variation pattern of an endless belt member of the image forming apparatus per at least one rotation of the endless belt member while endlessly moving the endless belt member by a driving rotating unit, and starts to execute, based on a result of analysis, a driving-speed-control-pattern updating process to update a driving speed control pattern of the driving rotating unit per at least one rotation of the endless belt member, after a power of an image forming apparatus is turned on and within a preparation period in which a predetermined preparation process is completed so that an image forming operation can be started based on an image formation command from an operator. | 07-02-2009 |
20090169226 | IMAGE FORMING APPARATUS - An image forming apparatus capable of observing toner amount limitation with reliability even when two types of developers which have the same have and have different densities is provided. After an inputted image signal is subjected to color conversion processing to make the toner amount limitation, at least one color signal of the converted color signals is converted into signals for a dark color toner and a light color toner by light and dark separation using a single light and dark separation look-up table. Thereafter, the toner amount is determined again for each pixel. In the case where the toner amount exceeds a predetermined value, the light and dark separation of at least one color is made until the toner amount is the predetermined value or less by using another light and dark separation look-up table. | 07-02-2009 |
20090175637 | Image Forming Apparatus and Image Forming Apparatus Control Method - An image forming apparatus includes a first image carrier that carries a first latent image. A first charging section charges the first image carrier. A first exposure section exposes the first image carrier charged by the first charging section. A first developing section develops the first latent image formed on the first image carrier in the first exposure section using a first liquid developer containing a carrier and first toner particles. A first primary transfer section transfers a first image developed in the first developing section onto a transfer medium. A second image carrier carries a second latent image. A second charging section charges the second image carrier. A second exposure section exposes the second image carrier charged by the second charging section. | 07-09-2009 |
20090175638 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREFOR - This invention provides an image forming apparatus capable of shortening the user's print waiting time as much as possible when it is determined that image adjustment is necessary during the image forming operation, and a control method therefor. To accomplish this, in a color image forming apparatus including a plurality of image forming stations which form toner images with a plurality of toners on the basis of a job, it is discriminated whether adjustment processing is necessary during a continuous image forming operation based on the job. If it is discriminated that adjustment processing is necessary, it is determined whether each of the image forming stations has a non-operating time enough to execute the discriminated adjustment processing during the image forming operation. The image forming station determined to have a non-operating time enough to execute adjustment processing executes the discriminated adjustment processing during the non-operating time. | 07-09-2009 |
20090238587 | Test print, color image printer using the test print and method for adjusting the color image printer using the test print - A color image printer includes a print engine ( | 09-24-2009 |
20090238588 | Image forming apparatus - An image forming apparatus includes a control unit to control a latent image support with a target rate; a first unit to detect patterns; plural parts to be detected revolving with the support; a second unit to detect passing of the part; a first generating unit to obtain an amplitude and a phase of fluctuation and a pattern for canceling out the fluctuation from the amplitude and the phase; a second generating unit to perform a process to obtain an amplitude and a phase of fluctuation while the support rotates once or more, perform the process again, calculate a change in the amplitude and phase, and generate another pattern for canceling out the change; and a correcting unit to correct the target rate by superimposing the patterns with the target rate. | 09-24-2009 |
20090285590 | Closed-Loop Printing Registration Systems, Devices, Components and Methods - Closed-loop printing registration systems (e.g., printers), devices, components and methods are provided. In one embodiment, a printer reproduces continuously and sequentially on a sheet of paper invisible ink landmarks that mimic registration information provided initially by permanent invisible ink markers, disposed on a platform or platen. According to one embodiment, once the first row of invisible ink landmarks has been printed on a sheet of paper, the first and subsequent rows of invisible ink landmarks provide a basis for continuous registration and alignment of sheet of the paper as it is being printed upon and advanced through the printer. In other embodiments, one or two invisible ink landmarks dispensed on a sheet of paper, preferably in combination with a sensed edge or corner of a sheet of paper, provide sufficient information for a sheet of paper to be registered and aligned initially with respect to a print head or carriage, and for subsequent invisible ink landmarks to be deposited on the sheet of paper at locations which are determined. | 11-19-2009 |
20090310993 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREFOR - An image forming apparatus capable of suppressing occurrences of image defects and maintaining the image density constant while improving the development ability. The image forming apparatus includes a photosensitive drum on which an electrostatic latent image is carried, a developing sleeve on which developer is carried, an AC high-voltage drive circuit, an AC transformer, a DC high-voltage circuit, a p-p voltage detection circuit, and a CPU. The p-p voltage detection circuit converts a peak-to-peak voltage across a capacitor into a DC voltage which is taken out as a capacity detection signal. Based on the capacity detection signal output from the p-p voltage detection circuit, the CPU changes an image formation condition, e.g., a set value of a developing bias voltage. | 12-17-2009 |
20100221024 | IMAGE FORMING APPARATUS, METHOD, AND PROGRAM STORAGE MEDIUM - An image forming apparatus includes an image formation unit, a conveying unit and controller. The image formation unit includes a rotating photoreceptor, a latent image formation unit, a developing unit, a first transfer unit, and a second transfer unit. Regardless of forming or not forming on the photoreceptor a belt-shaped image which is not being transferred onto a recording medium, the controller controls the image forming unit such that formation of an image quality adjusting image that is not transferred to the recording medium starts from a predetermined position in a rotational direction of the photoreceptor, and such that the recorded image is formed further downstream in the rotational direction of the photoreceptor than an image quality adjusting image region. | 09-02-2010 |
20100260511 | IMAGE FORMING APPARATUS - The present invention is directed to clean a collecting member without making toner on the collecting member enter a developing device and to reduce deterioration in throughput accompanying the operation of cleaning the collecting member with a simple configuration. A control unit is provided that executes cleaning operation of transferring toner collected by a cleaning roller to a conveyance belt via a photosensitive drum and collecting the toner by a cleaning device. In the cleaning operation, the control unit develops at least a surface part to which the toner is transferred from the cleaning roller, in the surface portion of the photosensitive drum with the toner by the developing device. | 10-14-2010 |
20100303489 | IMAGE FORMING APPARATUS - An image forming apparatus includes a photoreceptor drum, a charging part, an exposure unit, a developing part which feeds a photoreactive toner, a color formation exposure part, a transfer part, a recording medium feeding part, a fixing part, and a control unit part | 12-02-2010 |
20100322647 | ELECTROPHOTOGRAPHIC COLOR IMAGE FORMING APPARATUS - A color electrophotographic image forming apparatus, wherein a plurality of each including an electrophotographic photosensitive drum are detachably mountable to a main assembly of the apparatus, the apparatus includes an exposure device for forming an electrostatic latent image on the drum; a cartridge supporting member capable of demountably supporting the cartridges and movable between an inside position and an outside position; a driving device for driving the drum; an intermediary transfer belt onto which an image provided by developing the electrostatic latent image formed on the drum is transferred; and a controller for controlling execution of image formation in response to print jobs received by the apparatus, wherein the controller causes the exposure device to expose the drum to light after completion of a last one of the print jobs, and the controller stops drive of the by the driving device in a state that the exposed area is opposed to the intermediary transfer belt. | 12-23-2010 |
20110058831 | IMAGE FORMING APPARATUS - An apparatus includes: an image carrier; a charger to uniformly charge a surface of the image carrier; an exposing unit to perform write scanning on the image carrier; a developing unit that includes a developer carrier carrying a developer including a toner and that is configured to perform a visible image process on an electrostatic latent image formed on the image carrier; and a transferor to transfer a toner image that has been subjected to the process onto a material. If length Lg of a non-image part directly before an image part in an image carrier moving direction has the relation of | 03-10-2011 |
20110064433 | Imaging device and image forming apparatus - An imaging device includes an image carrying member; a developing unit for forming a toner image by developing an electrostatic latent image that has been formed on the image carrying member in a charged state; a cleaning unit for cleaning a toner that remains on the image carrying member after the toner image has been transferred from the image carrying member onto a transfer material; a lubricant applying unit for applying a lubricant on the image carrying member; and a control unit for performing drive control of the image carrying member, the developing unit, the cleaning unit, and the lubricant applying unit. Before the imaging device starts an imaging operation, the control unit controls the image carrying member, the developing unit, and the cleaning unit to perform respective operations; while controls the lubricant applying unit to repeat performing and suspending the operation in an intermittent manner. | 03-17-2011 |
20110158666 | IMAGE FORMING DEVICE THAT EXECUTES REVERSE-TRANSFER OPERATION - An image forming device in a continuous mode forms monochrome images on a plurality of recording media in succession. A transfer member is disposed in confrontation with a plurality of photosensitive members. In the continuous mode, a control unit controls a reverse-transfer unit to perform a reverse-transfer operation on at least one of a plurality of collecting members such that the excrescences are transferred from the at least one of the photosensitive members onto the transfer member in a medium interval. A switching unit sets a contact state to a first contact state during the reverse-transfer operation in the continuous mode such that one of the developing rollers for black contacts one of the photosensitive members for black and that remaining ones of the developing rollers are separated from remaining ones of the photosensitive members. | 06-30-2011 |
20110206394 | Image forming apparatus - In a RAM are stored a first deflection information table representing the relationship between the rotation amount and the deflection amount of a photosensitive element, a second deflection information table representing the relationship between the rotation amount and the deflection amount of a developing sleeve, a writing sensitivity information table representing the relationship between the rotation amount of the photosensitive element and latent image writing sensitivity, and an image forming condition information table representing the relationship between the rotation amount and laser power. An information input unit is provided to input the respective tables. During a print job, laser power is changed on the basis of the image forming condition information table, and laser power which causes deviation in an opposing direction is calculated on the basis of information input in a standby state to update the image forming condition information table. | 08-25-2011 |
20110206395 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - This invention provides an image forming apparatus, which attains a uniform gloss level of an overall image by preventing regions having different gloss levels from being generated on the image to be formed upon execution of image formation using a transparent toner, and a control method thereof. To accomplish this, an image forming apparatus of this invention identifies pixels to be developed using only a black toner of colored toners from an image signal of an image to be formed on a printing material upon execution of image formation using the transparent toner. Furthermore, the image forming apparatus executes exposure control so as to perform development using the transparent toner in an amount required to reduce a gloss level difference between the pixels to be developed using only the black toner and those to be developed using the colored toners other than the black toner. | 08-25-2011 |
20110236046 | IMAGE FORMING APPARATUS - There is provided an image forming apparatus including: a transfer-receiving member onto which developer images are transferred and superimposed in sequence by switching over plural developing units that develop latent images on a latent image holding body with a developer to form developer images; a primary transfer section that primary transfers the developer image on the latent image holding body onto the transfer-receiving member; a secondary transfer section that secondary transfers the developer image on the transfer-receiving member onto a recording medium; and a selection section that selects a combination of a first process speed for the primary transfer and a second process speed for the secondary transfer according to the number of developing units employed. | 09-29-2011 |
20110311254 | IMAGE FORMING APPARATUS - An image forming apparatus includes a rotatable image bearing member configured to bear an electrostatic latent image, a plurality of development devices including a developer bearing member configured to bear a developer for developing the electrostatic latent image, a rotatable development device supporting member configured to support the plurality of development devices. In the image forming apparatus, the developer bearing member is configured to execute development while contacting the image bearing member at a development position via the developer, rotating in the same direction as rotating direction of the image bearing member at the development position, and rotating at a speed faster than a surface speed of the image bearing member. In addition, the development device supporting member is configured to rotate in the same direction of a rotating direction of the image bearing member at a position where the development device supporting member and the image bearing member are facing each other, and change a developer bearing member existing at the development position to another developer bearing member by rotating. Furthermore, a relative speed of a surface moving speed of the developer bearing member with respect to a surface moving speed of the image bearing member when the developer bearing member abuts on or separates from the image bearing member due to the rotation of the development device supporting member becomes higher than a relative speed of the surface moving speed of the developer bearing member with respect to the surface moving speed of the surface of the image bearing member when the electrostatic latent image is developed, and a control unit configured to control a first potential difference, which is a potential difference between a potential of a bias applied to the developer bearing member when the developer bearing member abuts on or separates from the image bearing member and a potential of the image bearing member at the development position becomes higher than a second potential difference, which is a potential difference between the potential of the bias applied to the image bearing member and a potential of a non-imaging portion of the image bearing member at the development position. | 12-22-2011 |
20120014702 | IMAGE FORMING APPARATUS - An image forming apparatus includes a color toner image forming portion, a transparent toner image forming portion, a heating portion, an obtaining portion that obtains information on an area where a gloss level should partly be increased and an area where the gloss level should partly be decreased in an image, and a controller controls the color toner image forming portion and the transparent toner image forming portion to form the color toner images and a first partial transparent toner image on a recording material, controls the heating portion to heat the color toner images and the first partial transparent toner image on the recording material, controls the transparent toner image forming portion to form a second partial transparent toner image on the recording material, and controls the heating portion to heat the second partial transparent toner image on the recording material based on information obtained by the obtaining portion. | 01-19-2012 |
20120027443 | IMAGE FORMING APPARATUS - An image forming apparatus including: a photoreceptor for bearing a toner image; a transfer body onto which the toner image borne by the photoreceptor is transferred; a drive section for driving the photoreceptor and transfer body respectively, and a control section for controlling the drive section so as to drive the photoreceptor and transfer body at a predetermined driving speed, wherein the control section, under a state in which the control section controls to drive the transfer body at the predetermined driving speed, controls to: a) drive the photoreceptor while changing the driving speed of the photoreceptor within a range of driving speeds between low speed and high speed, including the predetermined driving speed, b) extract torque characteristics under the control which includes the change of driving speed of the photoreceptor, and c) determine the driving speed of the photoreceptor based on the extracted torque characteristics. | 02-02-2012 |
20120189331 | IMAGE FORMING APPARATUS AND METHOD THEREOF - An initialization method of an electrophotographic image forming apparatus includes rotating a photosensitive member to receive toner along a width of the photosensitive member prior to activation of a charging unit and to remove the toner with a cleaning unit, and activating the charging unit configured to charge the photosensitive member in response to a determination of a completion of a predetermined number of rotations of the photosensitive member. | 07-26-2012 |
20130011152 | IMAGE FORMING APPARATUS - There is provided an image forming apparatus in which an image forming speed is changed in a state where toner is provided between a photosensitive drum and an intermediate transfer member. Therefore, even if a speed difference between the photosensitive drum and the intermediate transfer member is generated, a drive torque can be suppressed, and deterioration caused by abrasion of the photosensitive drum and the intermediate transfer member can be reduced. | 01-10-2013 |
20130028619 | IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND IMAGE FORMING PROGRAM - An image forming apparatus and method compute a total amount of toner to be deposited per unit area of a target image. When the highest total amount of toner computed exceeds a given level, a heating determination unit, using a processor, determines whether a first heating amount range enabling fusing of the computed highest total amount of toner and a second heating amount range enabling fusing of the computed lowest total amount of toner have an overlapping portion that can effectively fuse a first toner image, a second toner image, and identifies a heating amount to fuse a toner image of the target image from an overlapping portion that can effectively fuse the first toner image, and the second toner image. | 01-31-2013 |
20130028620 | IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND IMAGE FORMING PROGRAM - An image forming apparatus and method that compute a total amount of toner to be deposited per unit area of a target image in which a first unit area is computed to form a first toner image using a highest total amount of toner, and a second unit area is computed to form a second toner image using a lowest total amount of toner. When the highest total amount of toner computed by a computing unit exceeds a given level, a transfer bias determination unit identifies a transfer bias to transfer a toner image of the target image from an overlapping portion that can effectively transfer the first toner image, and the second toner image. | 01-31-2013 |
20130136470 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image forming section attached on an apparatus main body, having a forming and writing section that forms and writes an electrostatic latent image on an image carrier based on image information, and a transfer section which transfers a developed image after the electrostatic latent image has been developed, onto a sheet; a sheet conveyance section detachably attached on the apparatus main body, which conveys the sheet to the image forming section; a sheet detection section attached on the apparatus main body, which detects a sheet position conveyed to the image forming section by the sheet conveyance section; and a position correction section which corrects an image writing position for an image in the image forming section based on information of the detected sheet position. | 05-30-2013 |
20130142528 | IMAGE FORMING APPARATUS - An image forming apparatus includes a photosensitive member, a charging unit, an image exposure unit configured to form image portion potential by exposing the photosensitive member to light, a weak exposure unit configured to form non-image portion potential by exposing the photosensitive member to weak light having a lower exposure amount than the light for forming the image portion potential, and a developer bearing member configured to carry developer, wherein a relationship of Ldev06-06-2013 | |
20130287416 | IMAGE FORMING APPARATUS - An image forming apparatus includes: a first image forming unit configured to form an image on a sheet using a first colorant to be heat-fixed on the sheet; a second image forming unit configured to form an image on the sheet using a second colorant that is erasable by heating; and a fixing device arranged further on a downstream side in a sheet conveying direction than the first image forming unit and further on an upstream side in the sheet conveying direction than the second image forming unit and capable of executing fixing processing for heat-fixing the image, which is formed on the sheet by the first image forming unit, on the sheet and executing erasing processing for heating the sheet, on which the image is formed with the second colorant, to erasing temperature to thereby erase the second colorant on the sheet. | 10-31-2013 |
20140037311 | IMAGE FORMING DEVICE - An image forming device includes each of developing devices including an image carrying part, a charging part that charges the image carrying part, a developing part on which a developing voltage is applied and which attaches developer to the image carrying part to develop the electrostatic latent image, and a control part that controls each of the developing devices. The developers are a white developer and other color developers, one of the developing devices using the white developer being defined the white developing device, the others using the other color developers being defined the non-white developing devices, and a developing potential difference of the white developing device is smaller than other developing potential differences of the non-white developing devices, the developing potential difference being defined between the developing voltage and potential of the image carrying part of the each developing device. | 02-06-2014 |
20140178086 | IMAGE FORMING APPARATUS - An image forming apparatus including: a photosensitive member; a charging device; an exposure device; and a developer carrying member, wherein, when it is assumed that an image forming area, a printing portion and a non-printing portion are an area on the photosensitive member on which an image to be transferred onto a recording material is formed, an area in the image forming area to which the developer adhere and an area in the image forming area to which the developer does not adhere, respectively, the exposure device exposes the printing portion at a first laser power, exposes the non-printing portion at a second laser power smaller than the first laser power, and exposes a non-image forming area on the photosensitive member between two adjacent image forming areas at no laser power or a third laser power smaller than the second laser power. | 06-26-2014 |
20140255050 | ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS - An image forming apparatus includes a charging bias output device, a developing bias output device, a transfer bias output device, and a controller. The controller controls the transfer bias output device to supply a transfer bias from a time at which a first position of a photosensitive member arrives at a transfer position after the charging bias output device starts supplying a charging bias. An initial value of the transfer bias is controlled to be smaller than a normal set value for a predetermined time period (Tc) which is a time after the transfer bias starts to be supplied and within a time corresponding to a rise time (Ta) during which a surface potential of the photosensitive member reaches a predetermined potential after the charging bias starts to be output. The first position of the photosensitive member is a position at which the charging device start charging the photosensitive member. | 09-11-2014 |
20140314431 | IMAGE FORMING APPARATUS - An image forming apparatus includes a plurality of image bearing members; a belt for receiving toner images from the image bearing members and for transferring the toner image onto a transfer material; a controller for driving the image bearing members; and wherein the image forming apparatus is operable in a monochromatic mode in which the toner image is formed only on a predetermined one of the image bearing members, and no image is formed on the other image bearing member, wherein in a operation in the monochromatic mode, the controller starts to drive the plurality of image bearing members in synchronism with each other in a state that the other image bearing member is spaced from the belt, and the predetermined image bearing member is in contact with the belt. | 10-23-2014 |
20150093130 | Image Forming Apparatus Ensuring Reduced Initial Bleeding Phenomenon - An image forming apparatus includes an apparatus main body, a power supply switch, a photoreceptor drum, a charging device, an exposure device, a developing device, a transfer roller, a cleaning device, and a toner-layer formation unit. The transfer roller contacts the circumferential surface of the photoreceptor drum at a downstream side with respect to the developing device in the rotation direction and is configured to transfer the toner image to a sheet. The cleaning device is cleaning device arranged opposed to the photoreceptor drum, downstream. The cleaning device is configured to clean the photoreceptor drum. The toner-layer formation unit is configured to form a toner layer on a surface of the transfer roller in an initial operation started after the apparatus main body is installed in a predetermined installation location and the power supply switch is switched on. | 04-02-2015 |
20150098717 | ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS - An electrophotographic image forming apparatus including a photoreceptor on which an electrostatic latent image is formed, a developing roller for forming a visual toner image by supplying toner onto the electrostatic latent image, a transfer unit for transferring the visual toner image onto a recording medium, and a cleaning member for removing residual toner remaining on the photoreceptor after the transfer of the visual toner image from the photoreceptor is described. The image forming apparatus operates in a printing mode, and a collecting mode in which the residual toner on the cleaning member is collected on the developing roller via the photoreceptor. A linear velocity of the developing roller in the collecting mode is faster than in the printing mode. | 04-09-2015 |
20160195832 | IMAGE FORMING APPARATUS | 07-07-2016 |