Hewlett-packard Development Company, L.P.

Hewlett-packard Company

Dean C Bayerle

John M Wade

Stephen A Smith

Trung Vu Nguyen

A method of and printing system for printing a multiple page print job on a print medium. A shingling sequence for a first page of the multiple page print job is opened by successively passing a printhead over the print medium and the first page is printed in a steady state mode of the printhead. The steady state mode of the printhead is maintained during a transition between printing the first page and printing a second page of the multiple page print job, such that the second page is printed as a continuation of the shingling sequence for the first page.

Printing system and method using page stitching for printing on roll media

When a thermal inkjet print cartridge operates to eject ink, three things happen at once: (1) heating by the heating resistor with flow of heat into the ink chamber; (2) cooling by heat drain toward the reservoir, print cartridge body and to ambient; and (3) cooling by carrying away of heat in the ink drops and replacement by cooler ink from the reservoir. The present invention is a method of detecting a depleted ink supply by monitoring the temperature of the printhead substrate with a temperature sensitive resistive trace on the printhead surface. When the print cartridge is warmed with warming pulses to a temperature higher than its normal operating temperature: and then firing pulses are implemented to eject ink, the temperature measured by the thermal sense resistor will decrease if the print cartridge is ejecting its normal, or nearly normal, amount of ink. If the print cartridge is ejecting less than its normal amount of ink the temperature will decrease less, stay the same, or even increase. It is this temperature increase or decrease that is used as an ink ejection detector. The method is quickly and readily performed by a printer before printing or between printing intervals. The indication of a depleted ink supply can be used to develop printer shutdown, or use of a reserve print cartridge, or an operator warning, or a combination of these tactics.

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Poway, CA, United States of America

Dean C Bayerle