Abstract:
Systems and methods for implementing use of customer documents in maintaining image quality or image quality consistency of printing devices are provided. The system may include a marking engine constructed to print images on an image bearing surface of the print device; one or more color measuring devices for measured toner images formed on the image bearing surface corresponding to the one or more relevant pages, and an image analyzer configured to generate reference images and to compare measured image data with the reference images. The image analyzer may also be configured to analyze input image data for a document and to identify one or more relevant pages of the document that may provide information regarding the state of the printing system to generated reference image data. Comparisons between the color separations of the reference image data and measured image data images may be realized for determining defects.
Abstract:
An image forming process module is provided having an integrated photoreceptor unit and development unit, and an image forming apparatus having the same. The image forming process module includes a photoreceptor unit having at least one photoreceptor on which an electrostatic latent image is formed. A development unit is installed around the outer surface of the photoreceptor and having a plurality of development assemblies for developing the latent image, thereby forming a visual image. A fixing frame is detachably installed to a main body of an image forming apparatus for fixing the photoreceptor unit and the development unit to be integrated into a single module. The image forming process module has the enhanced assembly and replacement efficiencies because the photoreceptor unit and the development unit are simultaneously installed to and uninstalled from a main body of an image forming apparatus as a single module.
Abstract:
An improved developer for an electrophotographic image forming apparatus is provided. The developer includes a developer frame, a plurality of developing cartridges that are sequentially mounted in the developer frame and have a plurality of toner feeding units for receiving respective toners. A plurality of toner cartridges feed the respective toners to the plurality of toner feeding units, respectively. A toner cartridge frame is detachably mounted in the developer frame and in which the plurality of toner cartridges are mounted.
Abstract:
An image forming method, comprising: a step of forming a toner image on a image carrying member; and a step of transferring the toner image from the image carrying member to a transfer member, wherein toner forming the toner image has a volume-basis median diameter of 3.0 to 5.0 μm, contains a releasing agent with a melting point in the range of from 40° C. to 75° C., and is added with a lubricant.
Abstract:
A color electrophotographic apparatus having a photosensitive member, an exposing device for forming an electrostatic latent image on the photosensitive member, four developing devices which attach toner on the photosensitive member and form a toner image and a transfer member for transferring the toner image onto a printing medium. The four developing devices include respectively a developing device for a yellow image, a magenta image, cyan image, and a black image. Each developing device includes a toner storing chamber for storing toner of a nonmagnetic one-component developer, a toner carrying member for forming a toner layer of the toner, a regulating member for regulating an amount of toner attached to the toner carrying member, a toner recovery chamber having an agitating member for agitating recovered toner, and a separating member for separating a toner supply chamber for the toner carrying member from the toner recovery chamber.
Abstract:
An image forming apparatus has a photoreceptor drum and a toner image receptor for forming toner images on both sides of a transfer sheet. The apparatus includes a photoreceptor drum; a toner image forming unit for forming a toner image on the photoreceptor drum; a toner image receptor, disposed facing the photoreceptor drum, for holding the toner image; a first transfer unit for transferring the toner image, on the photoreceptor drum, to one side surface of a transfer sheet; a second transfer unit for transferring the toner image, on the toner image receptor, to the other side surface of the transfer sheet; a fixing unit for fixing the toner image transferred to both side surfaces of the transfer sheet; an image size discriminator for discriminating a size of an image to be formed by the image forming apparatus, and for generating a signal corresponding to the discriminated size; and a control unit for controlling the image forming apparatus so that either the toner image corresponding to one page is formed on the toner image receptor or the toner image corresponding to plural pages is formed on the toner image receptor according to the signal generated by the image size discriminator.
Abstract:
A color printing apparatus and method for printing separate color images onto the two sides of a substrate, which includes a number of image bearing cylinders, not necessarily of the same size, each of which is related to a single color and an imaging mechanism for imaging each of the cylinders with two separate images. The apparatus includes a number of transfer mechanisms for simultaneously transferring each of the images of each of the cylinders onto the substrate, with at least one of the images being transferred to each side of the substrate, and each of the images being transferred to the substrate from a different location along each of the cylinders. Finally, the apparatus includes a turnover mechanism for turning the substrate over between the transferring of the first of the images of all of the cylinders and the transferring of the second of the two images. A similar apparatus can also be used in monochrome printing using a single imaging cylinder. Both continuous-web and sheet-fed systems may be used.
Abstract:
An image forming apparatus includes a plurality of developing devices to develop toners of different colors on an image carrier; a power supply to supply the plurality of developing devices with a first voltage to develop the toners on the image carrier; a switching unit to connect the power supply to one of the plurality of developing devices; and a voltage divider to supply some of the other developing devices that are not connected to the power supply with a second voltage to prevent toner development and to supply any other remaining developing device with a third voltage, an absolute value of which is less then an absolute value of the second voltage.
Abstract:
Image forming apparatus includes image forming units, an intermediate transfer member, a mark detecting mechanism, a counter, and a controller. The intermediate transfer member have marks. A distance between nth and (n+1)th marks is substantially equal to or smaller than a difference between a distance from a write position of the nth image forming unit to a primary transfer position of the (n+1)th image forming unit and a distance from a write position of the (n+1)th image forming unit to the primary transfer position of the (n+1)th image forming unit. The controller controls the nth image forming unit to start writing when the mark detecting mechanism detects the nth mark and the counter reaches a predetermined count value, and controls the (n+1)th image forming unit to start writing when the mark detecting mechanism detects the (n+1)th mark and the counter reaches another predetermined count value.
Abstract:
An image formation device is disclosed that is able to detect data errors each time data are read from a memory in a cartridge and able to detect transmission error of the data. The image formation device includes a cartridge memory controller and a verification unit to verify reliability of data read from the memory of the cartridge. The cartridge reads both predetermined data and verification data stored in the memory unit, and sends the predetermined data and verification data to the image formation device; the verification unit compares the read-out verification data to verification data stored in a main body of the image formation device to verify reliability of the data read from the memory unit.