Flow control system for ink cartridges

Details Flow control system for ink cartridges Flow control system for ink cartridges

1989-07-18

1990-06-05

Miller, Jr., George H.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1518

Patent

active

049318128

ABSTRACT:
An ink cartridge system is provided which includes a reservoir maintained at a negative pressure in communication with a printing system. As the printing system is activated, ink is expelled from the cartridge which draws ink from the reservoir by capillary action. To prevent the reverse flow of air and ink into the reservoir, a control unit is provided. The control unit includes an ink conduit communicating with a standpipe. A medial section is provided between the ink conduit and standpipe. The medial section includes an opening adapted to receive a ball within the ink conduit. The ball is freely movable within the ink conduit, but is larger than the opening. As a result, the outward flow of ink from the reservoir is allowed, while the backflow of ink and air into the reservoir is prevented by movement of the ball into the opening of the medial section.

REFERENCES:
patent: 4433341 (1984-02-01), Thomas
patent: 4500895 (1985-02-01), Buck et al.
patent: 4677447 (1987-06-01), Nielsen
patent: 4714937 (1987-12-01), Kaplinsky
patent: 4737801 (1988-04-01), Ichihashi et al.
Simpson, H. W., Drop-On-Demand Ink Jet Printing Head, Sep. 1981, vol. 24, No. 4, IBM Technical Disclosure Bulletin, p. 1820.
Hewlett-Packard Journal, May 1985, vol. 36, No. 5, pp. 1-27.

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