CPC B41J 2/17596 (2013.01) | 17 Claims |
1. A pressure control unit comprising:
a pressure chamber configured to accommodate a liquid, at least a part of a wall forming the pressure chamber being formed of a flexible member;
a flow inlet configured to cause the liquid to flow into the pressure chamber;
a flow outlet configured to cause the liquid to flow out from the pressure chamber;
a pressure receiving plate, which is provided on an inner surface of the flexible member, and is to be displaced toward an inner side and an outer side of the pressure chamber;
a valve member configured to open and close the flow inlet in accordance with the displacement of the pressure receiving plate; and
an internal flow passage, which extends in a boundary portion between the pressure receiving plate and the flexible member along the inner surface of the flexible member, and is opened on a side surface of the pressure receiving plate.
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