Ink jet recording apparatus and pump mechanism for use therewith
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United States of America Patent
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-
Oct 18, 1994
Issued Date -
N/A
app pub date -
Dec 30, 1993
filing date -
Mar 30, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A pump mechanism of an ink jet recording apparatus comprises a pump having a suction portion for sucking from a sucked member, said pump switching between the suction and non-suction operation of the suction portion by a reciprocating motion of a piston within a cylinder, without having a valve, a carrying member connected to said pump for carrying waste ink from said pump said carrying member opening to the atmosphere and a prevention mechanism for preventing a backflow of ink within said pump from the suction portion of said pump, to the outside of said pump which is caused by the reciprocating motion of the piston said prevention mechanism being an internal pump mechanism.
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