Beforehead maintenance for ink jet equipment

Application Number: 00108879
Application Date: 2000.05.22
Publication Number: 1290602
Publication Date: 2001.04.11
Priority Information: 1999/6/24 US 09/344,321
International: B41J2/165
Applicant(s) Name: Hewlett-Packarad Co.
Inventor(s) Name: Daon M. Bichino Hud;Babala H. Reed;Brian S. Talbot
Patent Agency Code: 11038
Patent Agent: yang guoxu
Abstract Document characteristics such as print media type (303) and selectable print quality variations (305) are used to determine whether to maintain print head, for example maintaining inking for print head. In operation, if a next print swath (217) contains (223) the next colour (221) in the printhead or set thereof (115), and the next swath would be greater than a predetermined time interval or number of swaths since the last firing of that colour ink (231) – whether on a page or at a service station (121) – and the last swath did not fire droplets of the colour, a decap service spit (235) of the printhead and nozzle firing tracking reset is triggered. Reaching or exceeding a fail-safe time limit (219) similarly triggers a decap service spit of the printhead.