Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
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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Hewlett--Packard Company
Preston Gerald E.
Reynolds Bruce A.
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