Ink jet printhead having a preloaded check valve

Details Ink jet printhead having a preloaded check valve Ink jet printhead having a preloaded check valve

1986-03-20

1987-06-30

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

With ink supply to marker

137854, 137526, G01D 1516

Patent

active

046774475

ABSTRACT:
A preloaded check valve disposed in a valve body between an ink reservoir and a printhead has a valve opening pressure or "cracking" pressure at least sufficient to overcome the hydrostatic pressure due to gravity of ink in the reservoir. This prevents depriming or leakage of ink at the orifices of the orifice plate forming part of the ink ejecting mechanism. Ejection of ink during printing creates a pressure differential across the valve sufficient to cause it to open and replenish the ink supply at the ink ejecting mechanism.

REFERENCES:
patent: 3983857 (1976-10-01), O'Connor
patent: 4500895 (1985-02-01), Buck
patent: 4509062 (1985-04-01), Low
patent: 4513784 (1985-04-01), Ferrand
patent: 4514742 (1985-04-01), Suga

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