INK CARTRIDGE Russian patent published in 2010 - IPC B41J2/175 

FIELD: printing industry.

SUBSTANCE: invention relates to ink cartridge for bubblejet. Ink cartridge for bubblejet includes chamber for liquid placement and air valve of pressure difference, connected with chamber for supporting in it state of negative pressure, air valve of pressure difference includes valve element, made with elastic material and case, valve element being made in form of round valve membrane with small round hole in the middle with has projection. Air valve of pressure difference contains front part of valve case or chamber of ink storage, valve element, back part of valve case or lid, air hole and air chamber formed in back part of valve case, there is a boss projecting from central part of air chamber bottom, and small round hole has ring peripheral projection on valve element, there existing possibility of pressing round hole to boss.

EFFECT: simple construction able to ensure stale supply of ink to printing head.

6 cl, 2 dwg