Patent ID: 9327513
Filing Date: 2016-05-03
CPC Classification: B41J

Claim Text:
1. A liquid supplying apparatus for supplying a liquid to a liquid ejection head capable of ejecting the liquid comprising: a liquid container configured to contain the liquid; a pressure regulating unit provided in a liquid supply channel communicating between the liquid container and the liquid ejection head; and a pressurizing pump, wherein the pressure regulating unit comprises: a first pressure chamber capable of introducing the liquid therein; a second pressure chamber capable of leading out the liquid therefrom, at least a part of the second pressure chamber being defined by a displacement member that is displaced according to an inside pressure; a communication path that allows the first pressure chamber and the second pressure chamber to communicate with each other; a valve capable of adjusting the opening degree of the communication path according to the displacement of the displacement member; a first urging unit configured to apply an urging force to the valve, the urging force of the first urging unit acting in a direction in which the communication path is closed; and a second urging unit configured to apply an urging force to the displacement member, the urging force of the second urging unit acting in a displacement direction in which the volume of the second pressure chamber is reduced, wherein a spring constant of the second urging unit being greater than a spring constant of the first urging unit, wherein the pressurizing pump is provided in a liquid supply channel communicating between the liquid container and the pressure regulating unit and is configured to supply the liquid in the liquid container to the pressure regulating unit.