Patents by Inventor Lucas David Barkley
Lucas David Barkley has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8210631Abstract: Disclosed is a method for printing a media sheet in a media processing device. The method includes aligning a first portion of a printhead of the media processing device to a print area of the media sheet. The method further includes printing the print area of the media sheet by traversing the printhead over the print area in a first direction. The printing is performed by the first portion. Further, the method includes aligning a second portion of the printhead to the print area by adjusting the media sheet relative to the printhead by an index distance in a direction perpendicular to the first direction. Thereafter, the method includes reprinting the print area by traversing the printhead over the print area in a second direction opposite to the first direction. The reprinting is performed by the second portion.Type: GrantFiled: March 25, 2009Date of Patent: July 3, 2012Assignee: Lexmark International, Inc.Inventors: James Ray Bailey, Lucas David Barkley, John Booth Bates, James Lesesne Bush, III, Michael Anthony Marra, III
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Publication number: 20100309489Abstract: A method for printing of raster data in a media processing device is disclosed. The method includes identifying an attribute of a set of raster lines of the raster data. The method further includes determining at least one print mode from a plurality of print modes based on the attribute. Each print mode of the plurality of print modes is configured to print the set of raster lines of the raster data. Furthermore, the method includes printing the set of raster lines of the raster data in the at least one print mode.Type: ApplicationFiled: June 9, 2009Publication date: December 9, 2010Inventors: James Ray Bailey, Lucas David Barkley, John Booth Bates, James Lesesne Bush, III, Eric David Langevin, Michael Anthony Marra, III
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Publication number: 20100245430Abstract: Disclosed is a method for printing a media sheet in a media processing device. The method includes aligning a first portion of a printhead of the media processing device to a print area of the media sheet. The method further includes printing the print area of the media sheet by traversing the printhead over the print area in a first direction. The printing is performed by the first portion. Further, the method includes aligning a second portion of the printhead to the print area by adjusting the media sheet relative to the printhead by an index distance in a direction perpendicular to the first direction. Thereafter, the method includes reprinting the print area by traversing the printhead over the print area in a second direction opposite to the first direction. The reprinting is performed by the second portion.Type: ApplicationFiled: March 25, 2009Publication date: September 30, 2010Inventors: James Ray Bailey, Lucas David Barkley, John Booth Bates, James Leseseme Bush, III, Michael Anthony Marra, III
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Publication number: 20100165015Abstract: A system for selecting and applying an appropriate print quality defect correction technique to compensate for specified print quality defects includes a printhead deployed to perform an operation that forms an image on a print medium sheet composed of multiple adjacently-positioned swaths of print, a sensor mechanism deployed to perform an operation that scans the image, detects the presence of specified print quality defects in the multiple adjacently-positioned swaths of print, and generates an output corresponding to the detected defect, and a control mechanism communicating with and controlling operations of the printhead and sensor mechanism and storing an algorithm that responds to the sensor mechanism output by analyzing and comparing the output with a stored threshold value and when the output exceeds the stored threshold value selecting and applying an appropriate print quality defect correction technique to the printhead that compensates for the detected print quality defect in the multiple adjacenType: ApplicationFiled: December 29, 2008Publication date: July 1, 2010Inventors: Lucas David Barkley, Daniel Robert LaBar, Michael Anthony Marra, III
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Patent number: 7594708Abstract: Heater chips for use with a printing device, such as heater chips that include a first heater array, positioned substantially adjacent a first via, and a second heater array, positioned substantially adjacent a second via. The heater chip can also include a region, positioned between the first heater array and the second heater array, and a temperature sensing element operable to sense the temperature of the region, where the temperature sensing element is substantially centrally disposed with respect to the region. According to one embodiment of the invention, the temperature sensing element comprises a temperature sensing resistor.Type: GrantFiled: December 30, 2005Date of Patent: September 29, 2009Assignee: Lexmark International, Inc.Inventors: Lucas David Barkley, Bruce David Gibson, Eric Spencer Hall, David G. King, George K. Parish
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Patent number: 7484823Abstract: Heater chips for use with a printing device, such as heater chips that include a first heater array, positioned substantially adjacent a first via, and a second heater array, positioned substantially adjacent a second via. The heater chip can also include a region, positioned between the first heater array and the second heater array, and a temperature sensing element operable to sense the temperature of the region, where the temperature sensing element is substantially centrally disposed with respect to the region. Additionally, the first heater array and the second heater array are operable to receive heating responsive to the temperature of the region sensed by the temperature sensing element to regulate the temperature of the region. According to one embodiment of the invention, the temperature sensing element comprises a temperature sensing resistor and the heating may occur via non-nucleating heating.Type: GrantFiled: December 30, 2005Date of Patent: February 3, 2009Assignee: Lexmark International, Inc.Inventors: Lucas David Barkley, Bruce David Gibson, Eric Spencer Hall, David G. King, George K Parish
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Patent number: 6660996Abstract: An encoder system may determine a plurality of intersection points for first and second encoder output signals produced by an encoder. Each intersection point may be determined by initiating a capture of sample points of each of the encoder signals and then examining the captured sample points.Type: GrantFiled: July 3, 2001Date of Patent: December 9, 2003Assignee: Lexmark International, Inc.Inventors: Christopher Alan Adkins, Lucas David Barkley, Michael Anthony Marra, III
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Patent number: 6637961Abstract: An analog encoder system repeatedly switches back and forth between monitoring of first and second encoder output signals to track movement of a structure associated with the encoder. An energization level of an encoder light element may be controlled in accordance with which encoder output signal is being monitored.Type: GrantFiled: July 2, 2001Date of Patent: October 28, 2003Assignee: Lexmark International, Inc.Inventors: Christopher Alan Adkins, Lucas David Barkley, Hugh Edwin Gilbert, Michael Anthony Marra, III
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Patent number: 6609781Abstract: A printhead firing control system for an inkjet printer includes a printhead mounted for movement across a paper path and an encoder for producing a digital output signal indicative of movement of the printhead. A filter circuit is connected to receive the digital output signal for filtering the digital output signal to remove frequency variations which meet at least one predetermined parameter, thereby providing a filtered digital signal. A fire-pulse generation circuit receives the filtered digital signal from the filter circuit and produces printhead heater resistor drive pulses based at least in part upon the filtered digital signal. This arrangement provides for improved printing accuracy by eliminating frequency changes in the digital encoder signal which may erroneously be caused by mechanical vibrations or other noise within the printer. An improved digitally controlled oscillator construction is also described.Type: GrantFiled: December 13, 2000Date of Patent: August 26, 2003Assignee: Lexmark International, Inc.Inventors: Christopher Alan Adkins, Lucas David Barkley, Michael Anthony Marra, III
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Patent number: 6600150Abstract: An analog encoder system repeatedly switches back and forth between monitoring of first and second encoder output signals to track movement of a structure associated with the encoder. Switching between signals is controlled according to an upper intersection amplitude and a lower intersection amplitude of the two encoder output signals.Type: GrantFiled: July 3, 2001Date of Patent: July 29, 2003Assignee: Lexmark International, Inc.Inventors: Christopher Alan Adkins, Lucas David Barkley, Michael Anthony Marra, III
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Patent number: 6525837Abstract: A printer assembly and a method for determining the position of a printer component, such as a printer paper-feed roller, during a move of the printer component from an initial position toward a desired final position. An analog encoder is operatively connected to the printer component, and a threshold device is connected to the analog output of the analog encoder. The position of the printer component is determined from the digital output of the threshold device and a digitization of the analog output of the analog encoder.Type: GrantFiled: June 29, 2001Date of Patent: February 25, 2003Assignee: Lexmark International, Inc.Inventors: Christopher Alan Adkins, Lucas David Barkley, Michael Anthony Marra, III
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Publication number: 20020126165Abstract: A printhead firing control system for an inkjet printer includes a printhead mounted for movement across a paper path and an encoder for producing a digital output signal indicative of movement of the printhead. A filter circuit is connected to receive the digital output signal for filtering the digital output signal to remove frequency variations which meet at least one predetermined parameter, thereby providing a filtered digital signal. A fire-pulse generation circuit receives the filtered digital signal from the filter circuit and produces printhead heater resistor drive pulses based at least in part upon the filtered digital signal. This arrangement provides for improved printing accuracy by eliminating frequency changes in the digital encoder signal which may erroneously be caused by mechanical vibrations or other noise within the printer. An improved digitally controlled oscillator construction is also described.Type: ApplicationFiled: December 13, 2000Publication date: September 12, 2002Inventors: Christopher Alan Adkins, Lucas David Barkley, Michael Anthony Marra
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Patent number: 6064171Abstract: The invention is a host-based stepper motor controller that reduces velocity overshoot and settling time. A typical embodiment of the invention will include a stepper motor, a carrier mechanically coupled to the stepper motor, a processor for controlling the stepper motor and a driver circuit allowing communication between the processor and the stepper motor. The processor control reduces velocity overshoot and settling time by guaranteeing that each move begins on the stepper motor phase that optimally reduces velocity overshoot and settling time. The processor generates an initial value indicative of the extent of a current move of a carrier mechanically coupled to a stepper motor. Next, the start phase of the current move is determined along with the direction of the next move.Type: GrantFiled: June 11, 1999Date of Patent: May 16, 2000Assignee: Lexmark, International, Inc.Inventors: Lucas David Barkley, Mark Walter Fagan, Randall David Mayo