Patents Represented by Attorney William A. Henry

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  • Method and apparatus for reducing transfer deletions
    Patent number: 5678122
    Abstract: An electrophotographic printing machine that transfers an image at a transfer work station or zone incorporates an adjustable electromechanical pretransfer paper guide to affect entrance geometry and paper landing position onto a photoreceptor, thereby minimizing image deletion.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: October 14, 1997
    Assignee: Xerox Corporation
    Inventor: Robert A. Gross
  • Xerographic charging and transfer using the pyroelectric effect
    Patent number: 5678145
    Abstract: Pyroelectric materials are used to create net charge/surface potentials for use in xerographic charge and transfer steps. Heating and cooling a pyroelectric film, such as, polyvinylidene fluoride induces thermal expansion or contraction which create surface charge density changes that can be used to charge a photoconductive surface and/or transfer an image from a photoconductive surface to a copy sheet.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: October 14, 1997
    Assignee: Xerox Corporation
    Inventors: Christopher Snelling, Dale R. Mashtare
  • Xerographic systems using piezoelectric intermediate belt transfer
    Patent number: 5671472
    Abstract: Piezoelectric properties of materials, such as, polyvinylidene fluoride (PVDF) are used to generate surface potentials that are adequate for the xerographic transfer function. A web of PVDF is used to form a transfer intermediate belt. The magnitude and direction of fields generated around the belt can be controlled by judicious location of field neutralizing devices and the direction, location and magnitude of the belt strain. Toner images are first transferred onto the belt and then transferred from the belt onto copy sheets without the need for high voltage power supplies.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: September 23, 1997
    Assignee: Xerox Corporation
    Inventor: Christopher Snelling
  • Solenoid impact control device
    Patent number: 5668517
    Abstract: An apparatus that controls impact noise of a solenoid by energy dissipation through both resilient and pneumatic devices. This is achieved by providing a device between the plunger of the solenoid and a machine member. The device includes a predetermined number of orifices which are of different sizes and placed at different locations. This forms an air metering system and controls the stiffness of the device for maximum impact noise attenuation.
    Type: Grant
    Filed: October 2, 1995
    Date of Patent: September 16, 1997
    Assignee: Xerox Corporation
    Inventor: Chee-Chiu J. Wong
  • Mandrel with a retractable segment for mounting a belt photoreceptor on the mandrel
    Patent number: 5666600
    Abstract: A photoreceptor apparatus constructed of a photoreceptor belt releasably attached to the surface of a cylindrical mandrel. The photoreceptor belt is preferably attached to the mandrel by means of a movable segment of the mandrel that is retracted into the mandrel to allow installation of the belt by reducing the effective circumference of the mandrel.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: September 9, 1997
    Assignee: Xerox Corporation
    Inventors: David R. Kamprath, William Brant
  • Unload while run apparatus for a copier/printer
    Patent number: 5666630
    Abstract: A device that allows an operator to unload copy sheets from an output tray of a machine, keep the machine running, and maintain integrity of the copy sheet stack. The output tray is slid to the right with respect to the front of the machine to allow the operator to unload the copy sheet stack. When slid to the right, an `X-shelf` is unfolded to hold the stack of continual copy sheet output. After the tray is emptied, it is slid to the left and back into the original position. The sheets on the `X-shelf` fall into the output tray and the job continues uninterrupted.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: September 9, 1997
    Assignee: Xerox Corporation
    Inventors: John D. Zoltner, Gary A. Kelpin
  • Scanning corotron
    Patent number: 5659176
    Abstract: A charging apparatus for modulating the distribution of available charge to a charge retentive surface. The charging apparatus includes a coronode wire positioned a predetermined distance away from the charge retentive surface and a charge stream dividing rod positioned between the coronode and charge retentive surface. The charge stream dividing rod has a conductive core and an insulating sheath overcoating the conductive core. Preferably, the conductive core is AC biased in order to sweep ions from the coronode wire back and forth over the charge retentive surface.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: August 19, 1997
    Assignee: Xerox Corporation
    Inventors: Richard F. Bergen, Ronald E. Godlove
  • Apparatus and method of controlling insertion of substrates into a stream of imaged substrates
    Patent number: 5655759
    Abstract: An apparatus and method is provided for controlling the insertion of one or more special insert sheets into a steam of regular imaged sheets. A coded sheet is placed into a sheet stack in a position where an insert sheet is to be placed. Sheets are removed from the stack one by one and transported along a path past a sensor toward a finishing apparatus. When the sensor detects a coded sheet, the coded sheet is diverted from the stream and later replaced with an insert sheet.
    Type: Grant
    Filed: September 28, 1995
    Date of Patent: August 12, 1997
    Assignee: Xerox Corporation
    Inventors: William C. Perkins, Kevin R. Mathers
  • Light blocking ion charging apparatus
    Patent number: 5655186
    Abstract: A charging apparatus that prevents fogging due to light generated by a corona source. The charging apparatus includes two offset reference electrodes lying in separate horizontal planes or a light eclipsing element positioned between a corona source and an electrode member.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: August 5, 1997
    Assignee: Xerox Corporation
    Inventors: Ronald E. Godlove, Robert W. Gundlach, Richard F. Bergen
  • Vacuum transport apparatus
    Patent number: 5608511
    Abstract: A prefuser vacuum transport apparatus that increases the latitude of sheet acquisition includes at least one perforated belt entrained around a vacuum plenum to provide a limited drive force on sheets being driven by the vacuum transport apparatus. The vacuum plenum includes a vacuum port surface having a profile that is contoured to follow the profile of the stiffest sheet to be transported with the maximum specified curl. The belt follows the port surface contour.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: March 4, 1997
    Assignee: Xerox Corporation
    Inventor: David M. Attridge
  • Three piece tape bound hard cover books
    Patent number: 5605425
    Abstract: A method for assembling hard cover books with a tape bound cover includes the steps of: providing front and rear hard covers; placing a book block between the front and rear covers; adhering a flexible spine member having an adhesive on one surface thereof to the front and rear hard covers and spine portion of the book block; and adhering an inner leaf sheet to inside surfaces of the front and rear hard covers and outside surfaces of the book block, thereby completing a bound hard cover book.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: February 25, 1997
    Assignee: Xerox Corporation
    Inventor: Barbara J. Schaefer
  • Cross roll registration deskew based on paper weight
    Patent number: 5601283
    Abstract: A sheet handler for deskewing and registering sheets en route to a processing station in an image processing apparatus includes cross rolls that drive each copy sheet against a registration edge for deskewing purposes. The angle of a driven one of the cross rolls with respect to the registration edge is adjusted, as well as, its speed varied based on the output of a sheet weight detector to a controller that controls pivotal movement of the driven cross roll.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: February 11, 1997
    Assignee: Xerox Corporation
    Inventor: Timothy S. Pinckney
  • System for controlling the motion of fused or unfused copy sheets entering a fuser nip
    Patent number: 5600424
    Abstract: A fuser roll nip sheet sensing scheme detects the torque spike of a fuser roll motor when paper is entering the nip region and uses that spike to signal a speed change to the motor to thereby control the motion of the paper. The nip sheet sensing scheme is used for paper position/timing and for single pass duplex fusing.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: February 4, 1997
    Assignee: Xerox Corporation
    Inventor: Michael A. Malachowski
  • Apparatus for charging a film on the internal surface of a drum
    Patent number: 5587584
    Abstract: A scorotron charging unit for charging Verde film residing on the inner surface of an imagesetter drum has a charging region that encompasses a 270.degree. sector of the drum. The scorotron is fashioned by attaching a metallic strip coronode having a sawtooth edge around a section of pipe. Each tooth of the sawtooth strip is bent to an angle of about 90.degree. with respect to the surface of the pipe. This pipe is slipped inside another pipe that includes a slit for the passage of ions in the direction of the Verde film, thus forming a scorotron. The scorotron while sliding through the drum holding this film, charges the film to sensitize it for imaging.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: December 24, 1996
    Assignee: Xerox Corporation
    Inventor: Richard F. Bergen
  • Pivotal bi-directional decurler
    Patent number: 5565971
    Abstract: A pivotal, bi-directional decurler that changes sheet bending direction from an away from image to a toward image direction includes a decurler support structure that is mounted for bi-directional movement by a cam mechanism. A belt member is entrained around two support rollers that are supported by the decurler support structure with an unsupported span between the rollers. A pinch roll is adapted to form a nip with the unsupported span of the belt to provide away from image bending of copy sheets when the cam mechanism is rotated into a first position. An elastomer coated rotating shaft positioned downstream of the away from image nip cooperates with a bending baffle when the cam mechanism is rotated into a second position to provide toward image bending of copy sheets.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: October 15, 1996
    Assignee: Xerox Corporation
    Inventors: Youti Kuo, James F. Smoak, Curtis Arline, Jr.
  • Shock mount frame for copiers
    Patent number: 5560313
    Abstract: A shock mounting assembly for attaching a copier/printer to shock mounts aboard a vessel. The assembly includes two steel supporting members attached to the base of the copier/printer that are easily and quickly screwed into two nonparallel shock mount frames with four jack screws to raise the copier/printer off its casters and restrain it in a fixed position. The four jack screws make detachment from the shock mount assembly a simple and time efficient process for repairmen.
    Type: Grant
    Filed: October 2, 1995
    Date of Patent: October 1, 1996
    Assignee: Xerox Corporation
    Inventors: Charles R. Brewer, III, Douglas W. Gates
  • Decurler apparatus for reducing cross curl in sheets
    Patent number: 5555083
    Abstract: A decurler for reducing cross curl in sheets includes at least one grooved elastomer transport belt and a ribbed pinch shaft. The ribs of the decurler shaft extend into the grooves in the belt to provide one-sided corrugations to a passing sheet and provide distributed localized bending of the copy sheet in the area of the belt grooves. Distributed local bending in the cross direction, as well as, in the wrap in the process direction around the ribbed decurler shaft provide cross curl reduction in the process direction.
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: September 10, 1996
    Assignee: Xerox Corporation
    Inventors: Youti Kuo, James F. Smoak
  • Vacuum transport apparatus
    Patent number: 5548388
    Abstract: A limited drive force prefuser vacuum transport apparatus includes at least two sets of belts entrained around a vacuum plenum to provide a limited drive force on sheets being driven by the vacuum transport apparatus. One set of the belts is deliberately driven at a lower speed than the other of the at least two sets of belts in order to maintain the ability of limited slip of sheets on the vacuum belt transport, thus accommodating speed variations among components of a copier/printer including a photoreceptor, paper transport and fuser.
    Type: Grant
    Filed: September 25, 1995
    Date of Patent: August 20, 1996
    Assignee: Xerox Corporation
    Inventor: Richard A. Schieck
  • Two step, large latitude, stalled roll registration system
    Patent number: 5543909
    Abstract: A stalled roll registration method and apparatus used as the sole timing adjustment in a paper path includes a clutch or motor driven registration nip, a buckle chamber and two sensors. After a sheet reaches a sensor upstream of the registration nip, the sheet lead edge advances a fixed distance into the stalled registration nip in order to buckle a known amount. Afterwards, the registration nip advances the deskewed sheet until a second sensor downstream of the registration nip is reached. The registration nip then stops, allowing the sheet to form an upstream buckle. This second buckle can be large since the lead edge is constrained by the registration nip. Therefore, large timing variations between sheet locations and image locations can be accommodated.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: August 6, 1996
    Assignee: Xerox Corporation
    Inventor: Lisbeth S. Quesnel
  • Edge raggedness and background removal by post development member
    Patent number: 5539506
    Abstract: An apparatus for removing the edge raggedness and background toner level of, for example, tri-level images by reestablishing the images and cleaning fields of the first developed image with a closely spaced electrode. The toner is redistributed by electrical and/or mechanical forces which leads to the removal of edge raggedness and background toner before transfer of the tri-level images to a copy sheet.
    Type: Grant
    Filed: October 31, 1994
    Date of Patent: July 23, 1996
    Assignee: Xerox Corporation
    Inventors: Lloyd F. Bean, Victor Berko-Boateng