Automatic failure recovery method and system for ink-jet printhe

Details Automatic failure recovery method and system for ink-jet printhe Automatic failure recovery method and system for ink-jet printhe

1992-09-21

1995-07-18

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 2165

Patent

active

054346053

ABSTRACT:
A fully automatic failure recovery method and system are described. The method and system achieve selected priming and flushing of one of plural capped printheads in response to an ink drop detector that indicates the need therefor. The priming duration and pressure are adjustable in accordance with the automatically determined extent of the failure of the selected printhead reliably to fire ink droplets. In its preferred embodiment, the system uses a plural cam and cam follower valve subsystem that has few moving parts the cams of which selectively are rotated via a one-way clutch with the ink-jet printer's paper feed drive motor to open a selected vacuum tube leading to an ink accumulator. Preferably, the method includes capping the plural printheads, priming a selected one of them by vacuuming the selected tube to an adjustable pressure differential, during an adjustable delay flushing the same of ink and particulate drawn thereto into the accumulator, uncapping the printheads to terminate the priming and flushing, wiping the printheads and returning the printer to service. The recovery method and system features a relatively short cycle time.

REFERENCES:
patent: 4493993 (1985-01-01), Kanamuller et al.
patent: 4853717 (1989-08-01), Harmon et al.
patent: 4959662 (1990-09-01), Kobayashi
patent: 4959673 (1990-09-01), Noda
patent: 5086305 (1992-02-01), Terasawa
patent: 5103244 (1992-04-01), Gast et al.
patent: 5128690 (1992-07-01), Nozawa
patent: 5166708 (1992-11-01), Hirano et al.

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