Ink jet printing apparatus having means for preventing excessive

Details Ink jet printing apparatus having means for preventing excessive Ink jet printing apparatus having means for preventing excessive

1993-02-09

1993-11-30

Fuller, Benjamin R.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1518

Patent

active

052669750

ABSTRACT:
An ink jet type recording device has a recording head which is moved over a recording sheet to jet ink droplets to form dots on it, an ink tank for supplying ink to the recording head, a cap member arranged outside the printing region in such a manner that it is moved to and from the recording head, a suction pump having an ink sucking inlet connected to the cap member and an ink discharging outlet connected to a waste ink tank. Also, a switch is provided for starting the suction pump; a memory circuit is provided for storing data representing the quantity of waste ink sucked out by the suction pump; and a control circuit is provided for nullifying an ink purging instruction when the sum of the quantities of waste ink exceeds a predetermined value. When it is detected through the memory circuit that the sum of the quantities of waste ink thus sucked out is beyond the capacity of the waste ink tank, the ink purging operation is suspended irrespective of a forcible ink purging instruction from the switch.

REFERENCES:
patent: 4571600 (1986-02-01), Hara
patent: 4577203 (1986-03-01), Kawamura
patent: 4965596 (1990-10-01), Nagoshi et al.
patent: 5172140 (1992-12-01), Hirabayashi et al.

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