Multiple-chamber gear pump for ink jet printing

Details Multiple-chamber gear pump for ink jet printing Multiple-chamber gear pump for ink jet printing

1995-01-17

1996-07-30

Casaregola, Louis J.

Pumps

Motor driven

Electric or magnetic motor

4171991, 4171992, 417435, 417439, 417522, 418200, 418102, 347 85, 347 89, B14J 218

Patent

active

055405690

ABSTRACT:
Pump heads comprising at least two gear-pump chambers are disclosed. Each chamber comprises a housing which defines a corresponding pump cavity. Each cavity contains a driving gear and at least one driven gear and has a separate inlet and outlet. The pump cavities are hydraulically interconnected by a fluid conduit allowing passage whenever the pump chambers are pumping a fluid so as to generate a higher pressure in one cavity relative to the other cavity, of the fluid from the higher-pressure cavity to the lower-pressure cavity sufficient to maintain hydraulic prime of both cavities. The invention is particularly useful for ink jet printing applications.

REFERENCES:
patent: 4320407 (1982-03-01), Goldis et al.
patent: 4364055 (1982-12-01), Aiba
patent: 4464668 (1984-08-01), Komai et al.
patent: 4476472 (1984-10-01), Aiba et al.
patent: 5380164 (1995-01-01), Fry et al.

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