Modal ink jet printing system

Details Modal ink jet printing system Modal ink jet printing system

1988-12-16

1991-02-19

Reynolds, Bruce A.

Recorders

Markers and/or driving means therefor

With ink supply to marker

E01D 1518

Patent

active

049948245

ABSTRACT:
An ink jet pen has two modes of operation, a normal speed mode and a high speed mode. In the normal speed mode, the pen's ink reservoir is maintained at a desired below-atmospheric pressure by a bubble generator orifice that introduces air from an atmospherically vented chamber into the reservoir to relieve the partial vacuum caused by ejection of ink. In the high speed mode, a heater heats air trapped in the ink reservoir. As the air tries to expand, it pressurizes the ink and causes it more quickly to refill the pen's ink-ejecting nozzle after firing. The pen can thus be fired at a faster rate. The bubble generator orifice is blocked during the high speed mode by the first droplet of ink expelled through the orifice, which acts to wet and seal a vent tube.

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Durbeck, Robert C. et al., "Ink Jet Printing", Output Hardcopy Devices, Academic Press, Inc., 1988, Chapter 13, pp. 311-370.
Hewlett-Packard Journal, May, 1985, vol. 36, No. 5, pp. 1-27.

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