Patent ID: 9315041
Filing Date: 2016-04-19
CPC Classification: B41J

Claim Text:
1. A pressure regulating unit provided on a supply path communicating between a liquid container for containing liquid and a liquid ejection head for ejecting liquid, the unit comprising: a first pressure chamber capable of introducing liquid; a second pressure chamber capable of leading out the liquid; a communication path that allows the first pressure chamber and the second pressure chamber to communicate with each other; a valve capable of adjusting an opening degree of the communication path; and an urging unit configured to apply an urging force to the valve, the urging force acting in a direction in which the communication path is closed and increasing according to a decrease in pressure in the first pressure chamber, wherein the urging unit includes: a first urging member configured to apply a predetermined first urging force that acts in the direction in which the communication path is closed and increases according to a decrease in pressure in the first pressure chamber; and a second urging member configured to apply a second urging force to the valve, the second urging force acting in the direction in which the communication path is closed, wherein at least a part of the first pressure chamber is formed of a first flexible member that is displaced according to the pressure in the first pressure chamber, and the first urging force of the first urging member to be applied to the valve changes according to displacement of the first flexible member.