US 11,745,514 B2
Pressure adjustment unit, liquid ejecting head, and liquid ejecting apparatus
Yu Okamura, Matsumoto (JP); and Yoshiki Sugawara, Shiojiri (JP)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Feb. 23, 2022, as Appl. No. 17/652,143.
Claims priority of application No. 2021-029754 (JP), filed on Feb. 26, 2021.
Prior Publication US 2022/0274421 A1, Sep. 1, 2022
Int. Cl. B41J 2/175 (2006.01)
CPC B41J 2/17596 (2013.01) 12 Claims
OG exemplary drawing
 
1. A pressure adjustment unit, comprising:
a flow passage including a first chamber, a second chamber, and a through hole through which a liquid flows from the first chamber to the second chamber;
a partition wall that separates between the first chamber and the second chamber and that the through hole is formed;
a first sealing portion having flexibility;
a second sealing portion facing with the first sealing portion;
a valve configured to close the flow passage by contact of the first sealing portion and the second sealing portion by moving in a first direction, which is a direction from the first chamber toward the second chamber, and to open the flow passage by releasing the contact of the first sealing portion and the second sealing portion by moving in a second direction opposite to the first direction;
a biasing member biasing the valve in the first direction; and
a restricting portion restricting movement of the valve in the first direction by contact with a to-be-restricted portion of the valve, at a second portion different from a first portion where the contact of the first sealing portion and the second sealing portion occurs.