Ink jet printer with variable-force ink declogging apparatus

Details Ink jet printer with variable-force ink declogging apparatus Ink jet printer with variable-force ink declogging apparatus

1993-07-27

1995-02-14

Grimley, A. T.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 47, B41J 2165

Patent

active

053899610

ABSTRACT:
An ink jet printer includes apparatus for preventing ink clogs from interfering with the flow of ink from a printing nozzle during a printing operation. The ink-declogging apparatus includes a vacuum pump having a vacuum chamber and a member movable with respect to such chamber to adjust the pressure therein. A printing nozzle is operably coupled to the chamber when the printing nozzle is not being used in a print operation. A stepper motor controls the position of the movable member relative to the chamber to selectively provide at least two different preset levels of vacuum (suction) to the printing nozzle. Having the capability of controlling the level of vacuum applied to the printing nozzle, a high vacuum need only be applied in situations warranting its use (e.g. to remove ink clogs), and the waste of ink (by an unnecessarily high vacuum) can be avoided.

REFERENCES:
patent: 4483749 (1984-11-01), Shimamura
patent: 4577203 (1986-03-01), Kawamura
patent: 4587535 (1986-05-01), Watanabe
patent: 4600931 (1986-07-01), Terasawa
patent: 4620202 (1986-10-01), Koto et al.
patent: 4734718 (1988-03-01), Iwagami et al.
patent: 4806955 (1989-02-01), Koto et al.
patent: 4893138 (1990-01-01), Terasawa et al.
patent: 5055856 (1991-10-01), Tomii et al.

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