| Patent application number | Description | Published |
|---|
| 20080304841 | Virtual clean belt to enable direct sensing of toner quantity - In accordance with one aspect of the present exemplary embodiment, a system determines the amount of toner on a photo receptor in a xerographic operation. A photo receptor is charged in one or more locations to create an image. A developer places a patch of a predetermined amount of toner onto the one or more charge locations of the photo receptor. A light emitting diode projects light onto the photo receptor, wherein the intensity of the light varies based on the voltage provided to the LED. An optical reflective sensor measures the reflectance of the toner placed on the photo receptor, the amount of reflectance of the toner is related in a known way to the intensity of the LED. | 12-11-2008 |
| 20090009776 | ADAPTIVE CYCLE UP CONVERGENCE CRITERIA - A method of adjusting cycle-up criteria of a device based on estimated noise levels, including obtaining a current estimated noise level, adjusting the cycle-up criteria according to the estimated noise level, comparing at least one signal, from which the noise level is estimated, with at least one target value, calculating the difference between the signal and the at least one target value, calculating the calculated difference between the signal and the at least one target value with the adjusted cycle-up criteria; and initiating a print job if the calculated difference falls within the adjusted cycle-up criteria. | 01-08-2009 |
| 20090297187 | MULTI-SENSOR CALIBRATION TECHNIQUE - A method and apparatus for sensor calibration and signal processing to obtain transfer efficiency measurements in a reprographic device from a pair of reflective toner area coverage (mass) sensors, one located before transfer and the other located after. The same mass is passed under both sensors and the ratio of responses yields the necessary sensor characterization. | 12-03-2009 |
| 20090297221 | TRANSFER BELT MODULE STEERING TO OPTIMIZE CONTACT FORCES AT TRANSFER BELT AND PHOTORECEPTOR BELT INTERFACE - According to aspects of the embodiments, there is provided methods of optimizing contact forces between transfer and photoreceptor belts in image forming devices. The method acquires initial and operational set point data for the photoreceptor and transfer belt at different stages of engagement. Yaw motion is applied to reduce any misalignment between the belts based on the acquired data. A processor is used to determine misalignment between the photoreceptor belt and the transfer belt, and an actuator can be used to apply yaw motion. The yaw motion can return the transfer belt and the photoreceptor belt to their initial set position, or return a steering subsystem actuator to its setting prior to engagement of the belts. Set point data can be from the respective transfer steering subsystem for the photoreceptor and the transfer belts. | 12-03-2009 |
| 20100080596 | ADAPTIVE TRANSFER PERFORMANCE REGULATION BY FEEDBACK AND CONTROL - An adaptive approach is described that maximizes xerographic transfer efficiency, i.e. minimizes post toner image transfer residual mass, in response to changes in operational conditions, variations in material, and/or changes in other factors that may otherwise adversely affect xerographic transfer efficiency. The described approach may be used during a set up phase, or startup phase, of a xerographic system to determine an initial transfer field that provides a desired level of toner image transfer efficiency. The described approach may also be used in real time to dynamically adjust a transfer field to maintain a desired level of transfer efficiency. The described approach allows optimal toner image transfer efficiency to be achieved despite changes in the operational environments, and/or changes in the materials, e.g., paper, toner, etc., being processed. | 04-01-2010 |
| 20100215381 | METHOD AND APPARATUS FOR AUTOMATICALLY ADJUSTING NIP WIDTH BASED ON A SCANNED NIP PRINT IMAGE ON ULTRAVIOLET (UV)-SENSITIVE MEDIA IN AN IMAGE PRODUCTION DEVICE - A method and apparatus for automatically adjusting nip width based on a scanned nip print image on ultraviolet (UV)-sensitive media in an image production device is disclosed. The method may include receiving a signal to generate a nip print, automatically inserting a sheet of UV-sensitive media into a fuser nip in the image production device, pausing the sheet of UV-sensitive media in the fuser nip for a predetermined time period, illuminating the UV-sensitive media with ultraviolet light to generate a nip print, scanning the generated nip print, determining if a nip width adjustment is required based on the scanned nip print, and if it is determined that a nip width adjustment is required based on the scanned nip print, adjusting the nip width using a nip width adjustment device. | 08-26-2010 |
| 20110026945 | XEROGRAPHIC PROCESS CONTROLS SCHEDULING APPROACH TO MITIGATE COSTS OF MEASUREMENT - A method and apparatus for maintaining color consistency includes varying a sampling interval to balance the benefit of xerographic process controls regulation with the cost of sampling. The request to sample is triggered by external indicators (area coverage, carrier age, relative humidity, temperature, etc.). Before the developed mass is expected to go out of range because of the external indicators, a patch measurement is made and the system is controlled back towards its desired set-point. | 02-03-2011 |
| 20110026952 | SYSTEMS AND METHODS FOR REDUCING VELOCITY ERRORS IN A MOVABLE IMAGE CARRIER OF AN IMAGE FORMING DEVICE - Systems and methods apply active feedback via a repetitive controller to compensate for periodic disturbances applied by recording media to a movable image carrier having a controlled velocity. The compensation parameters of the repetitive controller, once the error signal of the feedback converges to zero, can be stored with one or more characteristics of the print job or the recording media used for the print job. When other print jobs are received having the same one or more characteristics, the stored, converged compensation parameters can be retrieved, reducing the time to convergence of the systems and methods. | 02-03-2011 |
| 20110044707 | TONER IMAGE PROCESSING MACHINE WITH CHARGE COMPENSATION AND METHOD THEREOF - A method for compensating a charge retentive imaging surface for a photoreceptor in a toner image processing machine, the surface including a plurality of panels, each panel including a document printing zone (DPZ) and an interdocument zone (IDZ), and the machine including at least one specially programmed computer, at least one sensor, and charging members for charging the surface, including: measuring for each panel, using the sensor, first density values for a plurality of points in the DPZ, the DPZ in a printing region of the photoreceptor; measuring for each panel, using the sensor, a second density value for the IDZ; determining for each IDZ, using a processor in the computer, a respective compensated IDZ density value; and modifying operation of the charging members according to the compensated IDZ density values, such that the first density values for said each panel are substantially centered with a desired density value. | 02-24-2011 |
