Patent ID: 8042902
Filing Date: 2011-10-25
Classification: B41J

Abstract:
1. A pressure adjustment apparatus which adjusts a pressure of liquid inside a liquid ejection head including nozzles and flow channels, the pressure adjustment apparatus comprising: a tank which 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; a pump which changes a pressure of the gas inside the gas chamber so as to adjust a pressure of the liquid inside the liquid chamber; a buffer chamber which is filled with the gas and which damps gas-flow pulsations caused by the pump; a first switching device which connects and disconnects the buffer chamber and the gas chamber; and a second switching device which 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.