Xerox Corporation

Matthew Hudson Dixon

Lisa Marie Schmidt

Russell J Watt

Jeff Lee Nelson

Howard A Mizes

Ernest I Esplin

Terrance Lee Stephens

Yeqing Zhang

John A Durbin

James Bruce Campbell

Susan June Zoltner

Bhaskar T Ramakrishnan

Andrew S Yeh

Steven Van Cleve Korol

George Laurens Taylor

Joel Chan

Brian Edward Williams

Ngoc-Diep Nguyen

Kenneth Ralph Chamberlain

Luo Cheng

Katie Maria Teslow

Kelly D Sims

A method compensates for changes in drop mass of drops ejected by ink jets in a printhead of an ink jet imaging device. The method includes identifying an average of differences between drop placement position for ink drops on an image receiving member and default ink drop positions. The average of the differences is used to adjust a parameter of one or more ink jet driving signals in response to the average of the differences being greater than a predetermined threshold.

Drop mass calibration method based on drop positional feedback

A method evaluates image quality in an ink printing system and generates data values for altering the operation of the ink printing system. The method includes generating an ink image on an ink image receiving member that corresponds to a digital image stored in the ink printing system, generating a scanned image signal corresponding to the ink image, generating firing signal waveform adjustments and image data adjustments with reference to the scanned image signal corresponding to the ink image, and operating a printhead in an ink imaging system with reference to the firing signal waveform adjustments and the image data adjustments.

System and method for adjusting operation of printheads in an ink printing device

A method of compensating for changes in drop mass of drop emitted by at least one ink jet of an ink jet imaging device is provided. The method comprises identifying a drop placement position on an image receiving member of an ink jet imaging device for at least one ink jet of a print head. The identified drop placement position for the at least one ink jet is compared to a default drop placement position for the at least one ink jet to determine a difference in drop placement position. A drive signal for the at least one ink jet is then adjusted in accordance with the difference in drop placement position.

A method of adjusting an ink jet imaging device comprises measuring a drop parameter for drops generated by each drop generator in a plurality of drop generators. Each drop generator is configured to generate a drop in response to a drop generating signal having a fill portion, an eject portion, and a resonance tuning portion. A first portion of the drops are generated by each drop generator at a first fill density, and a second portion of the drops are generated by each drop generator at a second fill density. A drop parameter difference is measured for each drop generator of the plurality of drop generators of drops generated at the first and second fill densities. The resonance tuning portion of the drop generating signal for at least one drop generator is adjusted so that the drop parameter difference for the drop generator corresponds to the drop parameter difference normalization value.

Method for normalizing a printhead assembly

Growing community of inventors

Portland, OR, United States of America

Matthew Hudson Dixon