Abstract: In process control loops by keeping the DMA (Developed Mass per unit Area) under control, the print quality can be satisfactorily maintained to within tolerance in spite of temporal variabilities in subsystem parameters. The DMA is measured by creating patches in the interdocument zones. Three patches are created, one at high area coverage (90% to 100%), one at low area coverage (0 to 20%) and one at mid tone (around 50%). These DMA readings are compared to the setpoints. The errors are processed in the controller to generate the internal process parameters known as the cleaning voltage, discharge ratio and development voltage. These internal parameters have well known meaning to the physical xerographic process. The cleaning voltage is used to indicate the background in printing. The discharge ratio gives an indication of how much dot growth is present in the halftones. Finally, the development voltage is proportional to how much toner is laid on the photoreceptor.

Abstract: A substrate transport assembly having an air mover that moves air through an air housing such that a substrate is biased against a drive member. The substrate assembly further includes an air plenum that receives moving air and directs that air along a predetermined path. The air plenum expands when air is moving but is otherwise collapsed.

Abstract: The document processing system stores document forms which can be chosen by the user based on the specification of document attributes such as the purpose and distributees of document or on the finished styles of document, and displays the selected document form. The system enables the user to determine a proper document form easily and swiftly without the need of instructing a detailed document design and write the intended document in the displayed form.

Abstract: An image writing apparatus has improved performance of image reproduction based on a multi-beam scanning optical system, in which the number of laser beams n and the spacing of scanning lines p meet the condition: 1/(n.multidot.p).gtoreq.4 line pairs per millimeter. The optical system is further designed such that the number of deflection planes q of the deflector, a natural number m, where the period of repetitive patterns of image in the slow scan direction is equal to p multiplied by m, and the least common multiple E of m and n, or the least common multiple G of m, n and q meet the condition:1/(E.multidot.p).gtoreq.4 or 1/(G.multidot.p).gtoreq.4 line pairs per millimeter.

Abstract: An electrophotographic photoreceptor comprising a conductive substrate having thereon an undercoat layer and a photoconductive layer, the undercoat layer comprising a specific polymer compound which is prepared by using at least one of monomers represented by formula (1): ##STR1## wherein R.sup.1 represents a hydrogen atom or a methyl group; and A represents a group represented by formula (2), (3), (4), (5) or (6): ##STR2## where the symbols in the above formulae are defined in the specification.

Abstract: A digital scanning system for scanning a document includes a full width array having two sets of color sensitive photosites, each set of photosites being sensitive to a different color of light and a backdrop portion. The backdrop portion is colored such that the backdrop portion appears nearly black to one set of color sensitive photosites and appears nearly white to a different set of color sensitive photosites. the scanning system further includes a light source, a document edge detection circuit operatively connected to the set of color sensitive photosites which perceive the backdrop portion as being nearly black, and an image processing circuit operatively connected to the set of color sensitive photosites which perceive the backdrop portion as being nearly white.

Abstract: A method and apparatus for measuring colorimetric, gloss and registration data on a substrate exiting a printing machine. A detector using a series of red, green, and blue filters collects image data and maps the collected data to absolute color coordinates. The apparatus is factory calibrated to the specific colorants used in the printing machine. Gloss measurements are made using the same apparatus. Registration data between the various color separations is also obtained and feedback delivered to the various imaging modules. The detector allows on the fly data to be obtained and machine specific corrections to be made.

Abstract: An ink composition comprised of a polyesterified-dye (I) or polyurethane-dye (II) with a viscosity of from about 3 centipoise to about 20 centipoise at a temperature of from about 125.degree. C. to about 165.degree. C. and represented by the formulas ##STR1## wherein A is an organic chromophore, Y is an oxyalkylene or poly(oxyalkylene), R is an arylene or alkylene, n represents the number of repeating segments, and is an integer of from about 2 to about 50, and p represents the number of chains per chromophore and is an integer of from about 1 to about 6.

Abstract: An image enlarging reading device includes an image inputting device including an image sensor and an image displaying device, for example, a liquid crystal display for displaying a whole or a part of image information inputted by the image inputting device. A reading portion of the image inputting device and a displaying portion of the image displaying device are positioned on a front side and a rear side respectively of the image enhancement display device with the displaying portion positioned over an area being read, that is, an area of image inputting. The image may be enhanced by enlargement of an input image to a magnified output image.

Abstract: A bearing for supporting a member in an electrophotographic printing machine of the type having a latent image recorded in a photoconductive drum and for alternatively receiving at least a first shaft and a second shaft is provided. The first shaft has a shape substantially physically different from the second shaft. The bearing includes a body operably associated with the member, a first feature operably associated with the body for supporting the first shaft, and a second feature operably associated with the body for supporting the second shaft, whereby the bearing may accommodate both of the two shafts.

Abstract: An architecture of a fuser subsystem in an electrophotographic printer or copier includes a web which cleans the fuser roll. The web is driven by a mechanism which enables a constant velocity of the web relative to the fuser roll surface without the need of separate motor or controller. The design can further compensate for changes in frictional coefficient between the fuser roll and the web, such as is caused by large deposits of toner collected on the cleaning web.

Abstract: The present invention produces a data structure that indicates a partition of a given input set of line segments in a plane using a technique that is mathematically robust, canonical and dynamic. The technique is robust because it assumes a finite precision model of computer arithmetic and rounds the endpoints and intersections of all line segments to representable points in a way that is globally topologically consistent with the input set of line segments and that keeps the position of each rounded line segment close to the position of the input segment. The technique is canonical because the output partition produced is a function of the set of segments currently present only, and not of the history of insertion and deletions. This canonical aspect of the technique is facilitated by storing the input unrounded line segments in the partition data structure so that they are associated with their rounded fragments.

Abstract: A technique for calibrating the hardware and software of a digital printing apparatus relies on making seven component test patches which completely characterize the printing system, and then measuring the actual reflectance of these seven test patches. The measured reflectances are then converted, by the Yule-Nielsen equation, to values representative of the ink area coverage characteristic of each component test patch, because ink area coverage is the parameter that can be directly controlled by the digital printer. This conversion step takes into account the non-linear relationship between the reflectance of a halftone area and the amount of ink area coverage on the halftone area.

Abstract: A printing system includes a feeder module having a local clock; a marking engine having a local clock; a finisher module having a local clock; and a control unit. The control unit is connected to the feeder module, marking engine, and the finisher module. The control unit sends a sync preparation signal to the feeder module, the marking engine, and the finisher module. The feeder module, marking engine, and the finisher module each send a signal to the control unit so that the control unit can determine a difference between the local time of the control unit and the local time of each of the feeder module, marking engine, and the finisher module. The control unit sends event instructions to each of said feeder module, said marking engine, and said finisher module and timing information in terms of the local time of each of the feeder module, marking engine, and finishing module.

Abstract: An electrostatographic printing machine having an imaging member, operating components, and a control system including a sensor, compensator, and look up table for adjusting the operating components. The sensor signal provides a suitable indication of an operating component condition such as a developer unit or a photoreceptor charging device. A compensator responds to the sensor signal to provide a non-linear adjustment signal and the look up table converts the non-linear adjustment signal to a linear adjustment signal. A device such as a charging corotron or developer power supply responds to the linear adjustment signal to appropriately adjust the operating component.

Abstract: A method of compensating for toner cohesivity within a repository in a developer system by recording toner consumption rate and toner dispense rate over a given time within the developer system. A control responds to the toner consumption and dispense rates over the given time period to compute toner residence time in the repository and estimate a degree of toner cohesiveness. The control then projects an adjustment to the development voltage to suppress the effects of toner cohesivity.

Abstract: A forms creation and processing system which identifies and locates the active areas of a form using forms landmarks. The present invention eliminates the need to place predefined registration marks onto a machine readable form. The active areas of a form are those which may contain a user created mark, such as a checkbox or a signature box. A form is preanalyzed at the same time that the active areas are being described. The aim of the preanalysis is to find a set of graphic shapes, i.e. landmarks, that can be found on the form independent of their location or orientation in the image. Examples of such landmarks include paragraphs of text, heavy black lines and gray scale areas. The analysis looks at the geometric distribution and regularities of the connected components to choose a set of landmarks. The landmarks and active areas on the form are stored in a forms control file.

Abstract: A photoconductive imaging member comprised of a starburst aromatic amine compound of the formula ##STR1## wherein N is nitrogen; A.sup.1 to A.sup.3 each individually represent biaryl; R.sub.a, R.sub.b, and R.sub.c independently represent one of the groups of the following formulas ##STR2## wherein N is nitrogen; each Ar.sup.1 and Ar.sup.2 are aryl; R.sub.1 to R.sub.8 are substituents independently selected from the group consisting of hydrogen, halogen, hydrocarbon, and alkoxy; and X represents oxygen, sulfur, or an alkylene.

Abstract: A method for processing an input image including a plurality of input pixels each having a first number of possible input levels of optical density to form an output image including a plurality of separations each including a plurality of output pixels each having a second number of possible output levels of optical density.