Asymmetric restrictor for ink jet printhead

Details Asymmetric restrictor for ink jet printhead Asymmetric restrictor for ink jet printhead

1997-08-01

2000-08-29

Barlow, John

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

B41J 219

Patent

active

061097446

ABSTRACT:
An ink jet comprises a restrictor with an asymmetrical opening that creates a vortex in the ink flowing into an ink jet chamber. The vortex is created as the ink in an ink manifold is transferred from the ink manifold to the ink jet chamber. The asymmetrical geometry of the opening, in which a throat of the opening is laterally offset with respect to a vertical center line dividing the opening, creates a vortex in the ink flow within the ink jet chamber. The vortex creates a swirling motion which helps to sweep air bubbles trapped in the ink jet chamber toward an ink droplet ejection orifice so that an air bubble purge system can then easily expel the air bubbles through the ink droplet ejection orifice. By removing the trapped air bubbles, jet outages can be prevented.

REFERENCES:
patent: 4418355 (1983-11-01), DeYoung et al.
patent: 4520374 (1985-05-01), Koto
patent: 5870126 (1999-02-01), Kondo et al.

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