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公开(公告)号：CA2514399A1
公开(公告)日：2006-02-13
申请号：CA2514399
申请日：2005-08-05
Applicant: XEROX CORP
Inventor： LOFTHUS ROBERT M , GERMAN KRISTINE A
Abstract: A sensor module is able to sense at least one aspect of objects produced by a plurality of object sources. Since one sensor module or set of sensor elements is used to examine out put from the plurality of object sources, sensor to sens or variation is removed as a source of error. In a multi-engine document processor, information from the sensor module is used to adjust process actuators, adju st image data and/or generate scheduling constraints to improve output consistency. For example, facing pages of a document are rendered only on marking engin es operating within a predetermined tolerance of one another. Image data may be altered so that related images are within the measured capabilities of a plurality of marking engines. System actuators, such as xerographic actuators, of selecte d marking engines are adjusted to improve output consistency between marking engines.
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公开(公告)号：BR0106002A
公开(公告)日：2002-08-06
申请号：BR0106002
申请日：2001-12-11
Applicant: XEROX CORP
Inventor： WALLACE STANLEY J , LOFTHUS ROBERT M , BORTON MICHAEL D
Abstract: In color printing with a color registration system for the registration of plural color images on an image bearing surface, such as a photoreceptor belt of a color printer, chevron shaped registration marks are imaged on the image bearing surface, which registration marks correspond to the color images and are sensed by a registration marks sensor as the image bearing surface moves in its process direction. The registration marks sensor has chevron shaped optical sensing areas provided by a matching pair of spaced apart elongated bi-cell detectors in a generally chevron shaped pattern. Each of these spaced apart elongated bi-cell detectors has a parallelogram shaped optical sensing area. That parallelogram shaped sensing area is defined by elongated parallelogram sides extending at the same angle as one leg of the chevron shaped registration marks, and parallelogram ends which are parallel to the process direction, so as to provide higher color registration accuracy.
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23.发明专利
公开(公告)号：CA2363444A1
公开(公告)日：2002-05-29
申请号：CA2363444
申请日：2001-11-21
Applicant: XEROX CORP
Inventor： WING JOSEPH M , HOU JAMES S , COSTANZA DANIEL W , LOFTHUS ROBERT M , FURST MICHAEL R , CASELLA JAMES M , BRESSLER LOUIS J , SIRIANNI JOHN F , ADILETTA MARK A , LACAYO ORLANDO J , LEO MICHAEL F , MARTIN MICHAEL J , OMELCHENKO MARK A , AHL DAVID K
Abstract: A belt drive module and a corresponding method includes or employs a belt that moves along a path, at least one support roller or other structure that supports the belt as it moves along the path, a drive roller that effects movement of the belt along the path, a tension roller that applies a tension force to the belt in order to maintain engagement of the belt with the drive and/or support rollers, at least one processing station (e.g., an image processing station) disposed along the path that performs a process relative to a predetermined position of the bel t, and a torque assist drive that applies a torque assist force T d at a location between the drive roller and the tension roller. Torque assist may be provided by a current limited DC motor or by a constant torque friction clutch applied to a roller , e.g., a stripper roller of an electrophotographic imaging system. Advantageously, th e torque assist force T d facilitates accurate positioning of the belt (e.g., latent image registrations in a color imaging process employing multiple imaging processi ng stations) by reducing slippage between the drive roller and the belt that ma y be encountered due to belt wear, toner contamination and/or other debris.
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公开(公告)号：BR0006331A
公开(公告)日：2001-07-17
申请号：BR0006331
申请日：2000-11-29
Applicant: XEROX CORP
Inventor： CASTELLI VITTORIO , WOLF BARRY , LOFTHUS ROBERT M , ANDERSON HAROLD
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公开(公告)号：BR9905854A
公开(公告)日：2000-09-12
申请号：BR9905854
申请日：1999-12-15
Applicant: XEROX CORP
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Patent Agency Ranking
公开(公告)号：CA2285844A1
公开(公告)日：2000-06-16
申请号：CA2285844
申请日：1999-10-13
Applicant: XEROX CORP
Inventor： LOFTHUS ROBERT M , FURST MICHAEL R , LEO MICHAEL F , CASELLA JAMES M , COSTANZA DANIEL W , OMELCHENKO MARK A , ADILETTA MARK A , HOU SSUJAN , LACAYO ORLANDO J , WING JOSEPH M , MARTIN MICHAEL J
Abstract: A single pass, multi-color electrophotographic printing machine architecture uses a vertically oriented photoconductive belt. Transfer of the toner powder images occur at the lowermost portion of the photoconductive belt. The photoconductive belt is elliptically shaped, having a major and a minor axis. N image recording stations are positioned adjacent an exterior surface of the photoconductive belt on one side of the major axis thereof. N-1 image recording stations are positioned adjacent the exterior surface of the photoconductive belt on the other side of the major axis thereof. The image recording stations record electrostatic latent images on the photoconductive belt. This architecture optimizes image registration while minimizing the overall height of the printing machine.
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公开(公告)号：DE69122058T2
公开(公告)日：1997-02-20
申请号：DE69122058
申请日：1991-12-12
Applicant: XEROX CORP
Inventor： DEJONG JOANNES N M , RICCIARDELLI JOHN J , LEAN MENG H , SCHWEID STUART A , WOLF BARRY , LOFTHUS ROBERT M
Abstract: An inductive-type rotary encoder (2) capable of generating an output signal indicative of the angular position of a rotor (4) to a stator (6) is disclosed. The rotary encoder (2) includes a stator (6) having at least one conductive pattern on one side thereof, and a rotor (4) having another conductive pattern on one side thereof which faces the at least one conductive pattern of the stator (6). The conductive patterns are inductively coupled to one another so as to generate an output signal indicative of the angular position of the rotor (4) relative to the stator (6). In order to reduce the overall size and number of parts required, the circuitry for energizing the stator conductive pattern(s) and for generating the output signal can be provided on a printed circuit board, the opposite side of which contains the at least one stator conductive pattern. In order to reduce noise as well as to reduce the first harmonic error, lead lines for attaching the stator and rotor conductive patterns to the controlling circuitry and a return line which extends along substantially the entire length of the rotor or stator conductive patterns and attaches to one of the lead lines are provided and specially located relative to undulations of the conductive patterns. Additionally, the length of spokes which define undulations of the respective rotor and stator conductive patterns can be controlled to improve the performance of the rotary encoder. A rotary encoder (2) including inductively coupled rotor and stator conductive patterns for generating a relative angular position (or rotary speed) of the rotor (4) relative to the stator (6), as well as stator and rotor index pulse patterns inductively coupled for generating an index pulse once per revolution of the rotor relative to the stator is also provided.
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公开(公告)号：DE68917917D1
公开(公告)日：1994-10-06
申请号：DE68917917
申请日：1989-05-31
Applicant: XEROX CORP
Inventor： DANIELE JOSEPH J , LOFTHUS ROBERT M
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公开(公告)号：BR102012020822A2
公开(公告)日：2016-11-29
申请号：BR102012020822
申请日：2012-08-20
Applicant: XEROX CORP
Inventor： HAMBY ERIC S , LOFTHUS ROBERT M , SRINIVAS SHARATH
Abstract: resumo patente de invenção: sistema para coagrupamento de dados de avaliação de estudantes. a presente invenção refere-se a um sistema e método para fazer uso de dados de avaliação formativa coletados que identificam agrupamentos de estudantes e simultaneamente determinam as características dos agrupamentos de estudantes. uma decomposição dos dados é realizada com teorias espectrais de gráficos e algoritmos de lógica fuzzy * p. 20 para identificar os agrupamentos de estudantes, agrupamentos de dados de avaliação e as relações entre eles. uma saída de dados acionável é apresentada aos professores para a avaliação do progresso educacional.
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公开(公告)号：CA2514399C
公开(公告)日：2009-10-20
申请号：CA2514399
申请日：2005-08-05
Applicant: XEROX CORP
Inventor： GERMAN KRISTINE A , LOFTHUS ROBERT M
Abstract: A sensor module is able to sense at least one aspect of objects produced b y a plurality of object sources. Since one sensor module or set of sensor elements is used to examine output from the plurality of object sources, sensor to senso r variation is removed as a source of error. In a multi-engine document processor, information from the sensor module is used to adjust process actuators, adju st image data and/or generate scheduling constraints to improve output consistency. For example, facing pages of a document are rendered only on marking engines operating within a predetermined tolerance of one another. Image data may be altered so that related images are within the measured capabilities of a plurality of marking engines. System actuators, such as xerographic actuators, of selecte d marking engines are adjusted to improve output consistency between marking engines.
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