Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1976-04-06
1977-07-05
Miller, Jr., George H.
Recorders
Markers and/or driving means therefor
With ink supply to marker
346 75, 310 81, G01D 1518, H01V 700
Patent
active
040343804
ABSTRACT:
Ink is fed into an ink chamber in an ink ejection head. An ejection orifice communicates with the ink chamber. An electrostrictive plate defines a surface of the ink chamber and is strained to decrease the volume of the ink chamber when an electrical pulse is applied thereto to cause ink to be ejected through the orifice. The apparatus is inoperative if there is no ink in the ink chamber or there are air bubbles in the ink in the ink chamber. In such a case the voltage across the electrostrictive plate has an oscillating component, the oscillating component being damped out when the ink chamber is completely filled with ink. A sensor is provided to detect the oscillating component and generate a signal indicating said detection. Circuit means are provided to increase the magnitude of the pulse when the oscillating component has a magnitude indicating that the apparatus is not inoperative but some bubbles are present in the chamber. The increased pulse magnitude serves to maintain the ink ejection at the desired level.
REFERENCES:
patent: 3747120 (1973-07-01), Stemme
patent: 3787882 (1974-01-01), Fillmore et al.
patent: 3820121 (1974-06-01), Rich et al.
patent: 3930260 (1975-12-01), Sicking
patent: 3950762 (1976-04-01), Anderka
patent: 3967286 (1976-06-01), Anderson et al.
patent: 3971039 (1976-07-01), Takano et al.
Jordan Frank J.
Miller Jr. George H.
Ricoh Co. Ltd.
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