Xerox Corporation

Henry R Kang

Warren E Solodar

Timothy J Fuller

Samuel Kaplan

Stephen F Pond

Raymond K Crandall

Joseph R Weber

Joel W Grover

Robert E Coward

A method and apparatus of printing with a liquid ink printhead ejecting ink in swaths on a recording medium to form an image including a plurality of dots deposited at pixel locations of a scanline. The printer deposits a plurality of dots at adjacent pixel locations on the scan line during non-consecutive swaths of the printhead to form the image. Dot interaction between dots is minimized so that no two dots are deposited adjacent to each other in consecutive depositions of the dots of consecutive swaths of the printhead. Reduction of ink bleeding, printhead signatures such as banding, and other defects caused by clogged nozzles of the printhead are reduced.

Dot scheduling for liquid ink printers

A method for converting a set of input image pixels having a first resolution and being represented by a set of input image signals to a set of output image pixels having a second resolution and being represented by a set of output image signals. The method is adapted for use in an electroreprographic machine having a memory for storing images and an image output terminal for printing the images. The method comprises the following steps: first, developing a set of state determination rules which govern the conversion of the set of input image pixels having the first resolution to the set of output image pixels having the second resolution; second, communicating the set of input image signals and the set output image signals to the memory, third, relating a plurality of selected input image pixels with a selected one of the output image pixels; fourth, determining respective binary states of the plurality of selected input image pixels; finally, corresponding the selected output image pixel with one of at least three output states by reference to the determined, respective binary states and one of the state determination rules.

Resolution conversion with simulated multi-bit gray

A method for improving the quality of bitmap image includes repeated iterations of doubling the resolution of an image and smoothing the doubled image. The doubling and smoothing steps are repeated until the intermediate image has a resolution which is greater than a desired resolution of an output image. After generating such an intermediate resolution image, the intermediate resolution image has its resolution reduced to the desired resolution by area mapping to generate a pseudo-gray scale image. The pseudo-gray image is then further processed to further improve the image quality, and then is converted to a true gray scale image or a binary image having the desired resolution.

Resolution conversion of bitmap images

Disclosed is an ink jet ink composition comprising a liquid vehicle such as water or ethanol, a dye, and a linear N-hydroxyl substituted polyethyleneimine polymer. In a preferred embodiment, the linear N-hydroxyl substituted polyethyleneimine polymer is selected from the group consisting of linear poly(N-hydroxyethylethyleneimine), linear poly(N-hydroxypropylethyleneimine), and linear poly(N-hydroxymethylethyleneimine). Also disclosed is a process for generating images with the disclosed inks in ink jet printing processes, including continuous stream ink jet printing processes. Further, a process for preparing the linear N-hydroxyl substituted polyethyleneimine polymers included in the inks of the present invention is also disclosed.

Ink jet ink compositions

An improved ink jet composition comprised of a major amount of water, a hydroxypropylated polyethyleneimine with a weight average molecular weight of from about 1,000 to about 10,000, and a dye component; and wherein the ink has a viscosity of from about 1 to about 5 centipoise.

Waterfast ink jet compositions and process

Disclosed in an ink jet composition comprised of a major amount of water, a hydroxyethylated polyethylenimine polymer, and a dye component wherein the polymer has incorporated therein from about 65 percent by weight to about 80 percent by weight of hydroxyethyl groups.

Growing community of inventors

Fairport, NY, United States of America

Henry R Kang