EDWARD F BURKE
Engineering in West Linn, OR

5488396, Jan 30, 1996

Mar 7, 1994

8/206998

Edward F. Burke - Lake Oswego OR
Randy C. Karambelas - Milwaukie OR

Tektronix, Inc. - Wilsonville OR

B41J 1120

347 37

A print head (216) positioner (260) includes a stepper motor (264) that is coupled by a substantially friction- and backlash-free taut metal band (266) to a lever arm (268) that imparts precise lateral motion to a positioning shaft (220) that is rigidly attached to the print head assembly. Each step of the stepper motor is translated by the lever arm into one pixel (0. 085 millimeter) of lateral movement of the shaft. The exact amount of translation per step of the stepper motor is adjustable by an eccentrically mounted ball (272) that is minutely positionable (274) on the lever arm. The ball couples angular motion of the lever arm to lateral motion of the shaft such that adjusting the ball position on the lever arm provides a-variable scale factor adjustment that compensates for tolerance buildups and exact inter-nozzle spacing on the print head. The shaft is biased toward the ball by a spring (284). The shaft further allows the print head to swing away from a print media support, such as a drum (202), for maintenance.

7931362, Apr 26, 2011

Jul 13, 2007

11/827758

Edward Francis Burke - Lake Oswego OR, US

Xerox Corporation - Norwalk CT

B41J 2/01

347103, 101218, 101247

A hydraulic system controls engagement of a transfix roller with an image receiving member in a printer. The system includes a motor having an output shaft, a translational member having a first end and a second end, one of the first and the second ends being mechanically coupled to the output shaft of the motor so the motor output shaft moves the translational member in a linear path, a hydraulic translator coupled to the other end of the translational member so movement of the translational member in the linear path displaces hydraulic fluid within the hydraulic translator to move a pair of links in a linear direction, a transfix roller having a first end and a second end, the first and the second ends of the transfix roller being mechanically coupled to the pair of links so the displacement of the hydraulic fluid within the hydraulic translator moves the transfix roller in the linear direction for movement towards and away from an image receiving member, and a controller electrically coupled to the motor to send a motor control signal to the motor for controlling direction and speed of the motor output shaft.

4939440, Jul 3, 1990

Dec 4, 1989

7/445579

Edward F. Burke - Lake Oswego OR

Tektronix, Inc. - Beaverton OR

G05B 1300

318646

A motion controller for the head carriage of an ink jet printer comprises a target signal generator providing constant velocity reference input to a servo loop controller. Also, two levels of current are applied to the drive motor during direction reversal, a lower one during deceleration of the carriage, and a higher one during acceleration of the carriage. The timing of the two current levels is determined by inputting a rectified velocity signal into a slope detector. A comparator converts the output of the slope detector into a binary signal for controlling the motor current level.

5036266, Jul 30, 1991

Mar 30, 1990

7/502379

Edward F. Burke - Lake Oswego OR

Tektronix, Inc. - Beaverton OR

G05B 1500

318646

A system (11) for monitoring and controlling the movement of a mass (12) along a predetermined path (14) by a motor-driven flexible member (20) is provided to modulate the motor drive output so that the actual velocity of the mass corresponds more closely to the desired target velocity profile. The system preferably employs a dual loop servo system wherein an outer servo loop uses conventional linear encoding techniques and is supplemented by an inner servo loop utilizing a sensor (27) that detects a physical characteristic of the flexible member representative of the relative velocity of the mass. Relative velocity transducers utilizing magnetic circuits and operating according to variable reluctance principles for generating relative mass velocity signals directly are disclosed.

5455604, Oct 3, 1995

Aug 15, 1994

8/290441

Ronald L. Adams - Portland OR
Charles Bradford - Garland TX
Edward F. Burke - Lake Oswego OR
Eldon P. Hoffman - West Linn OR
Rodney B. Gilbert - West Linn OR
James D. Rise - Beaverton OR
Arthur C. Van Horne - Lake Oswego OR

Tektronix, Inc. - Wilsonville OR

B41J 201, B41J 1322, B41J 1516

346138

A printer accurately controls the passage of print media therethrough and maintains the print media taut as the print media passes through a printing zone while the media is printed by an ink jet printer. The print media sheet is preferably carried by a rotating drum in a first direction through the printing zone, with the drum being reversed to cause the exiting of the print media sheet from the printer. A pressure fixing or fusing apparatus may be positioned to flatten ink spots on the print media as the print media exits from the printer. The pressure fixing or fusing mechanism is preferably used in the case of a hot-melt or phase-change ink jet printer.

5196241, Mar 23, 1993

Apr 8, 1991

7/681252

Edward F. Burke - Lake Oswego OR
Donald R. Titterington - Tualatin OR
James D. Rise - Beaverton OR
Joern B. Eriksen - Oregon City OR
Clark W. Crawford - Wilsonville OR

Tektronix, Inc. - Wilsonville OR

B05D 312

427444

Methods and apparatus for processing printed substrates having a phase change ink layer of non-uniform thickness are disclosed. Application of a combination of heat and pressure reorients the printed ink layer to provide a layer having a substantially uniform thickness and flat surface conformation, at least in the area of each discrete color. A release surface (55) is positioned adjacent the printed ink layer during processing. A resilient contact surface (56) is also provided to facilitate reorientation of the printed ink layer. Mechanical buffing of the processed, printed substrate improves image quality. Application of a light transmissive, protective coating that overlays the printed ink layer also improves image quality.

5300957, Apr 5, 1994

Feb 12, 1992

7/836172

Edward F. Burke - Lake Oswego OR

Tektronix, Inc. - Wilsonville OR

B41J 201

346 11

A cylindrical drum is rotatable about a drum axis for supporting a print medium during printing. A print head has a plurality of printing elements for printing image elements of a predetermined color at a predetermined image-element printing rate. The drum is rotated about the drum axis at a predetermined speed such that alternate image-element locations are addressed by each printing element during each rotation of the drum at the predetermined printing rate. The drum rotates two revolutions at each print-head location along the axis, and all image-element locations are addressed.

4957014, Sep 18, 1990

Apr 10, 1989

7/335359

Edward F. Burke - Lake Oswego OR

Tektronix, Inc. - Beaverton OR

F16H 1906

74 8922

An apparatus providing a substantially fixed length cable drive comprises a motor-driven capstan having a helical groove. The groove on the capstan is sized to receive opposite ends of a cable for simultaneously letting out and taking up the cable. The cable passes over a fixed pulley and is attached to a carriage at a point intermediate the capstan and pulley. The carriage is guided along a rail defining a fixed mass path. The section of cable between the carriage and pulley is parallel to the mass path. The cable ends on the capstan are disposed on opposite sides of a plane containing the parallel cable section during travel of the carriage along the mass path.

5532566, Jul 2, 1996

Feb 1, 1995

8/382348

Edward F. Burke - Lake Oswego OR
David L. Knierim - Wilsonville OR

Tektronix, Inc. - Wilsonville OR

G05F 110

318650

A voltage mode drive for a servo system builds a drive matrix from an error signal, which is the difference between a measured value for a parameter of the servo system, such as the position of a rotating drum, and a reference signal, a voltage control signal for the servo system, and an estimated set of parameters for the servo system, the parameters including drive current. The outputs from the drive matrix are a new estimated set of parameters for the servo system which are multiplied by appropriate system constants to produce the voltage control signal. The voltage control signal is amplified by a voltage amplifier and applied to drive the servo system.

7021739, Apr 4, 2006

Nov 24, 2003

10/721842

Edward F. Burke - Lake Oswego OR, US
Barry D. Reeves - Lake Oswego OR, US
David L. Knierim - Wilsonville OR, US
James B. Jensen - Woodburn OR, US
Brent R. Jones - Tualatin OR, US
David D. Martenson - Oregon City OR, US
Lee D. Hills - Sherwood OR, US

Xerox Corporation - Stamford CT

B41J 29/393

347 19

Disclosed are methods for compensating for failed ink jets in an ink jet apparatus. The method in embodiments determines if one or more ink jets are nonfunctioning or have failed and substitutes for the one or more nonfunctioning ink jets by using one or more operational ink jets. The operational ink jets used are neighboring operational ink jets that fill in for the one or more failed ink jets. The one or more failed ink jets are disabled wherein a primary image pass is performed followed by one or more additional imaging passes to fill in for the one or more disabled ink jets by enabling the one or more neighboring operational ink jets. The additional imaging passes may be a right fill imaging pass, a left fill imaging pass or a combination of both.