Pressure-regulating airbag for embedding-type ink cartridge and the method for assembling it

摘要

This specification discloses a negative pressure-regulating airbag for an embedding-type ink cartridge and its assembly method. In addition to a bag with a variable volume, the negative pressure-regulating airbag has a buckle ring, a plate, and a elastic element. The buckle ring is closely connected to the bag. A vent hole is formed in the middle of the buckle ring, allowing air to enter or escape the airbag when the ambient pressure changes. The buckle ring has a protruding part on the surface of the bag so as to be embedded into a preserved hole on an ink cartridge by pressing during the assembly. This forms a quick and tight connection between the airbag and the ink cartridge. One end of the elastic element is connected to the ink cartridge and the other end to the plate so that the plate imposes a force to depress the airbag. This keeps a negative pressure inside the cartridge to prevent ink leakage from the cartridge during transportation or use.