Off-axis ink supply with pressurized ink tube for preventing air

Details Off-axis ink supply with pressurized ink tube for preventing air Off-axis ink supply with pressurized ink tube for preventing air

1996-08-30

1999-11-23

Le, N.

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

B41J 2175

Patent

active

059888024

ABSTRACT:
In the preferred embodiment, an inkjet printer includes a replaceable print cartridge which is inserted into a scanning carriage. The print cartridge contains a regulator valve. An ink tube extends from the scanning carriage to a separate, disposable ink supply cartridge located within the printer. A second valve connected between the ink tube and the ink supply cartridge is automatically actuated when it is determined that the printer is not being used. The valve seal is more reliable than the inexpensive one-way valve seal in the disposable ink supply cartridge. The reliable valve seal prevents any air bubbles in the tube from expanding toward the ink supply cartridge, enabling the use of more flexible tubes which have less stringent air diffusion characteristics. In another embodiment, instead of a valve, a pressure source is connected to the ink tube to maintain the partial air pressure within the tube at approximately ambient pressure.

REFERENCES:
patent: 3805276 (1974-04-01), Ishii
patent: 4514742 (1985-04-01), Suga et al.
patent: 4558326 (1985-12-01), Kimura et al.
patent: 4630077 (1986-12-01), Berruti et al.
patent: 4777497 (1988-10-01), Nozu et al.
patent: 5367328 (1994-11-01), Erickson
patent: 5369429 (1994-11-01), Erickson
patent: 5469201 (1995-11-01), Erickson et al.
patent: 5552815 (1996-09-01), Shimoda
Webster's II New Riverside University Dictionary, p. 932, 1994.

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