Lexmark International, Inc.

Claudia Alexandra Marin

Kerry Leland Embry

Robert Reed Booth

Paul Wesley Etter

Michael Craig Leemhuis

John William Kietzman

Ligia Aura Bejat

Gerald Lee Fish

Ryan David Brockman

Jing X Sun

Donald Wayne Stafford

Benjamin Alan Askren

Donald Leo Elbert

Ronald Lloyd Roe

Ronald Willard Baker

Philip Jerome Heink

Hrishikesh Pramod Gogate

Calvin Dale Murphy

Tom E Stickler

Jean Marie Massie

Bhaskar Gopalanarayanan

Michael James Bensing

Sean David Smith

John Joseph Kraseski

Charles Edward Akers, Jr

Benjamin John Goebel

Michael Lewis Pawley

Jason Edward Gordon

Travis Alan Riggs

Charles Jerome Cheek

Gregorio Balandran

A hyper-branched polyester and a method of making the same having a tri-functional monomer A3, a di-functional monomer B2 and a mono-functional monomer C1 having a monomer ratio of A3:B2:C1 from about 1:0.2:2 to about 1:1.4:0.2 for use in a chemically processed electrophotographic toner providing a lower fusing temperature. In one form, the hyper-branched polyester includes a tri-hydroxy monomer, a di-acid and its derivatives, and a mono-acid and its derivatives. In other forms, a substituted anhydride and a long chain hydrocarbon carboxylic acid and its derivatives may also be included in the di-functional monomer.

Hyper-branched polyester for use in CPT toner and method of preparing the same

A system for adjusting a selected operating parameter of an image forming device to control white vector based on selected environmental conditions includes an image forming station having a photoconductive surface with a latent image formed by discharged areas leaving non-discharged areas different from the discharged areas, a sensor mechanism for measuring selected environmental conditions of dry-bulb temperature and relative humidity, a control mechanism for reading the sensor mechanism to adjust the voltage bias of a charging unit by an offset applied to the charging unit based on a wet-bulb temperature value so as to minimize white vector without enabling onset of development of toner background on non-discharged areas, and a memory connected to and accessible by the control mechanism and storing a lookup table of a list of wet-bulb temperature values related to measured dry-bulb temperature and relative humidity values and correlated to a list of voltage bias offsets.

System and method for adjusting voltage bias of a charge roller of an image forming device based on environmental conditions to control white vector

An electrographic image forming device may use a feedback loop to determine environmental conditions and accordingly set one or more operating parameters. The device may detect a resistance/capacitance characteristic of a feedback loop comprising an interface between a first component and a second component of an image forming unit. The device may detect temperature measurements and humidity measurements that can be used to calculate wet-bulb temperature or other metrics used to characterize ambient environmental conditions. The interface may be one in which a toner image is transferred during image forming device operation. A controller may adjust the resistance/capacitance characteristic in response to wet-bulb temperature in conjunction with measured transfer feedback voltage.

Transfer print voltage adjustment based on temperature, humidity, and transfer feedback voltage

The present application is directed to methods of controlling the transfer voltage in a transfer nip formed between the photoconductive member and the transfer member. The methods offset the effects of large transfer current spikes caused when a media sheet enters and exits the transfer nip and account for temperature and humidity operating parameters using wet-bulb temperature measurements to adjust the transfer voltage. The control may include either ramping up or ramping down the transfer voltage. The ramped transfer voltage may include a series of alternating positive and negative steps that generally trend to ramp up or down. The size of the steps may further be adjusted to provide a smooth transition.

Method for adjusting transfer voltage controls based on environmental conditions to improve print quality in a direct transfer image forming device

A system for adjusting selected operating parameters of an image forming device to improve color registration based on selected environmental conditions includes a first image forming station to print a first registration mark on a substrate, a second image forming station to at least partially erase the first registration mark to form a registration pattern in a reverse transfer process of the color registration, and a control mechanism to adjust voltage biases of charge and developer rolls of the second image forming station based on wet-bulb temperature values determined from measured dry-bulb temperature and relative humidity values and stored in a lookup table so as to maintain a predetermined potential difference between charged and uncharged areas of a PC drum of the second image forming station that avoids Paschen breakdown and the development of toner at charged areas of the PC drum during the reverse transfer process of the color registration.

System and method for adjusting selected operating parameters of image forming device based on selected environmental conditions to improve color registration

The present invention is generally directed to composite materials or charge rolls comprising a sleeved foam charge roll where the sleeve is interference-fit over the foam core, and methods of constructing them. The foam core can be made with an outer diameter larger than that of the sleeve inner diameter. The sleeve can be interference fit over the foam core to provide a functional charge roll. In some embodiments the charge roll can be used in an image forming apparatus including, but not limited to, an electrophotography system, an electrophotographic copying machine, and a laser printer.

Interference fit sleeved foam charge rolls and composite materials

A helical auger member for transporting toner in an image forming apparatus. The auger member may be implemented as part of a waste toner removal system for removing toner from a photoconductive member of a toner cartridge. Toner that is removed by a cleaner member is transported through a cleaner housing with a helical member, such as a coil wire, having a pitch to outer diameter ratio from about 1.5 to 2.5.

Auger for use in an image forming device

An apparatus and method for ink-jet printing including an intermediate transfer medium, a transfer medium, and an ink-jet print head to jet ink toward the intermediate transfer medium, to transfer an ink image from the intermediate transfer medium to media with an optimum image transfer and optical density. The optimum image transfer and optical density is accomplished by generating uniform pressure across a nip generated by the intermediate transfer medium and the transfer medium, and control of a release coating thickness resident on the intermediate transfer medium and a time delay between a jetting of ink toward the intermediate transfer medium and transfer of jetted ink resident on a surface of the intermediate transfer medium to the media.

Apparatus and method for printing with an inkjet drum

An apparatus for ink-jet printing including an ink-jet print head to jet ink, a coating solid, and a coating holder to support the coating solid, wherein the coating holder transfers a portion of the coating solid onto a medium to form a coating solid layer. The coating holder and coating solid may be combined in a removable cartridge. In addition, the medium may be an intermediate transfer medium, a media support medium, a transfer medium, or media, such as paper. A method for inkjet printing also includes applying a coating solid to a medium to form a layer of the coating solid, in a solid form, having predetermined thickness, and applying ink to the medium. The layer of coating solid may interact with the applied ink to destabilize colorant in the ink.

Apparatus and method for printing using a coating solid

Growing community of inventors

Lexington, KY, United States of America

Claudia Alexandra Marin