Pressure adjustment apparatus and image forming apparatus,...

Details Pressure adjustment apparatus and image forming apparatus,... Pressure adjustment apparatus and image forming apparatus,...

Filed on

2008-02-14

Date issued

2011-10-25

Examiner

Le, Uyen Chau N (Department: 2874)

Patent Class

Incremental printing of symbolic information

SubClass

Ink jet

SubSubClass

Controller

Other Related Categories

C347S006000, C347S007000, C347S019000, C347S085000, C347S086000

Type

Reexamination Certificate

Status

active

Patent number

08042902

Description

ABSTRACT:
A pressure adjustment apparatus for adjusting a pressure of liquid inside a liquid ejection head including nozzles and flow channels includes: a tank; a pump; a buffer chamber; a first switching device; and a second switching device. The tank includes a movable film and a hermetically sealed container of a prescribed volume, the movable film dividing the hermetically sealed container into a gas chamber filled with gas and a liquid chamber filled with the liquid to be supplied to the liquid ejection head. The pump changes a pressure of the gas inside the gas chamber so as to adjust a pressure of the liquid inside the liquid chamber. The buffer chamber is filled with the gas and damps gas-flow pulsations caused by the pump. The first switching device connects and disconnects the buffer chamber and the gas chamber. The second switching device switches between a state where the pump is connected to the gas chamber without through the buffer chamber, and a state where the pump is connected to the buffer chamber.

REFERENCES:
patent: 7296881 (2007-11-01), Langford et al.
patent: 7524044 (2009-04-01), Kumagai
patent: 2006/0109321 (2006-05-01), Nottelman et al.
patent: 2006-150963 (2006-06-01), None

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