Apparatus for maintaining hydrostatic pressure in an ink jet pri

Details Apparatus for maintaining hydrostatic pressure in an ink jet pri Apparatus for maintaining hydrostatic pressure in an ink jet pri

1996-10-10

1999-07-27

Le, N.

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

347 32, B41J 2175

Patent

active

059298820

ABSTRACT:
An ink supply system for an ink jet printing device in which the elevation of the ink reservoir is controlled as a function of the elevation of the printhead orifices. In a preferred embodiment, the ink reservoir is mounted on an elevating carriage which is mechanically linked to the printhead via a Bowden.TM. cable. The cable cooperates with a pulley on the printhead such that rotation of the printhead results in translational movement of the elevating carriage. The dimensions of the pulley are selected such that the elevational changes in the reservoir ink level correspond directly with the elevational changes in the printhead orifices. Thus, the hydrostatic pressure head at the printhead orifices remains constant as the printhead is rotated from its home position to the priming position.

REFERENCES:
patent: 4700205 (1987-10-01), Rich et al.
patent: 4731639 (1988-03-01), Gutmann

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