Appeal No. 96-2416
Application 08/206,447
APPENDIX
1. An ink jet printing system comprising at least one ink
jet printhead and means for supplying ink under pressure to the
printhead wherein said means comprises:
an accumulator for holding a supply of ink under pressure
for delivery to the printhead, said accumulator comprising
expansible chamber means comprising a body having a chamber
therein, and a member movable in one direction in said chamber
for decreasing the volume of said chamber and in the opposite
direction for increasing the volume of said chamber,
said chamber being ported for delivery of ink thereinto from
an ink supply and for delivery of ink under pressure therefrom to
said printhead;
means for exerting force on said member for biasing it for
movement in said one direction in said chamber for pressurizing
ink filling said chamber to capacity and for forcing ink out of
said chamber for delivery to said printhead on demand for ink by
said printhead;
a pump for pumping ink from an ink supply to said chamber;
and
means for effecting operation of the pump to deliver ink
from said supply to said chamber in response to decrease in
volume of said chamber and in the corresponding volume of ink
therein to a predetermined lower limit resulting from delivery of
ink from said chamber to said printhead and for cutting off
operation of the pump in response to increase in volume of said
chamber and in the corresponding volume of ink therein to a
predetermined upper limit resulting from delivery of ink from
said supply to said chamber to fill said chamber to capacity.
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