Incremental printing of symbolic information – Ink jet – Controller
Patent
1994-10-06
1996-12-10
Fuller, Benjamin R.
Incremental printing of symbolic information
Ink jet
Controller
B41J 2195
Patent
active
055835449
ABSTRACT:
The ink level sensor of the invention comprises an ink container having a generally cylindrical shield extending downward from its top to define shielded and unshielded compartments within the container. Ink, but not foam, froth or mist, flows under the shield to the shielded compartment. A plurality of conductive rods of differing length extend downwardly into the shielded compartment from the container top. The rods are connected to an impedance network which provides signals representative of the ink level inside the container. A vacuum source can be connected to each compartment to maintain pressure equilibrium in the compartments and to prevent foam, froth or mist from entering the shielded compartment. Alternatively, a return pump is used to force ink into the container such that each compartment can be vented to the atmosphere.
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Patent abstracts of Japan, vol. 7 No. 196 (p. 219) Aug. 26, 1983 and JP, A, 58 095218 (Zoujirushi Mahoobin K.K.) Jun. 6, 1983 see abstract.
Sharpe Colin
Stamer Michael E.
Anderson L.
Fuller Benjamin R.
Videojet Systems International Inc.
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