Apparatus for declogging an ink jet recording apparatus

Details Apparatus for declogging an ink jet recording apparatus Apparatus for declogging an ink jet recording apparatus

1993-03-15

1995-01-03

Fuller, Benjamin R.

Recorders

Markers and/or driving means therefor

Printing, dotting, or punching marker

347 30, 347 33, B41J 2165

Patent

active

053790618

ABSTRACT:
In a recording apparatus with an ink jet print head which forms dots on a recording sheet by ink jets shot from an array of nozzles, a microcomputer determines whether a printing defect is a light printing defect caused by paper particles and dust adhering to the nozzles or a heavy printing defect caused by the entry of air bubbles into the ink flow paths. The determination is made on the basis of intervals of operating a print recovery button mounted on a chassis of the recording apparatus. For the light printing defect, the computer puts a cap member to the front face of the nozzles of the print head and applies a negative pressure to the nozzles, thereby to reduce the amount of ink emitted from the nozzles. For the heavy printing defect, the computer increases the amount of ink.

REFERENCES:
patent: 4362572 (1982-12-01), Wallace
patent: 4577203 (1986-03-01), Kawamura
patent: 4692777 (1987-09-01), Hasumi
patent: 4926196 (1990-05-01), Mizoguchi et al.
patent: 4977459 (1990-12-01), Ebinuma et al.

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