Cartridge for liquid jetting apparatus

1. A cartridge that is mountable to a liquid jetting apparatus that includes an air supply apparatus that supplies air and a liquid jetting unit that jets liquid, the cartridge comprising:

a liquid container that contains the liquid, at least a portion of the liquid container being flexible;

a case that includes the liquid container; and

an air bag that is positioned between an internal wall of the case and the liquid container, at least a portion of which is flexible, and that contacts with the liquid container in a state of being expanded upon being supplied with the air,

wherein the air bag includes,

a first bag that is expanded upon being supplied with the air, and

a second bag that is positioned above the first bag when the cartridge is in use, and is expanded upon being supplied with the air, wherein the first bag and the second bag are fluidly dependent on each other,

the air bag and the liquid container are aligned in a first direction intersecting an up-down direction when the cartridge is in use, and

when the cartridge is in use and the cartridge is viewed in the first direction, the first bag is arranged to overlap a lower part of the center in the up-down direction of the liquid container.

2. The cartridge according to claim 1 ,

wherein the air bag includes a pillow-type bag, the pillow-type bag is divided into the first bag and the second bag.

3. The cartridge according to claim 2 ,

wherein the pillow-type bag includes a configuration in which edges of two overlapped film materials are joined through welding, and

in a joint portion formed through welding, notch portions are formed in a portion adjacent to the first bag in a direction intersecting the up-down direction and the first direction, and a portion adjacent to the second bag in the direction intersecting the up-down direction and the first direction.

4. The cartridge according to claim 3 ,

wherein an introduction port for introducing the air into the air bag is included so as to be shared by the first bag and the second bag,

an introduction path that branches into the first bag and the second bag from the introduction port is formed in the pillow-type bag, and

the introduction path includes a configuration in which surface press molding has been performed on at least one film material out of the two film materials.

5. The cartridge according to claim 1 , further comprising:

a second air bag that is expanded upon being supplied with the air,

wherein the liquid container is divided into a first container and a second container,

the first container and the second container are aligned in a second direction intersecting the up-down direction and the first direction, and are communicated with each other at a lower part of the center in the up-down direction of the liquid container, and

the first air bag is arranged at a position opposing the first container, and the second air bag is arranged at a position opposing the second container.

6. The cartridge according to claim 5 ,

wherein the liquid container is a flexible bag, and is divided into the first container and the second container by a clamping member that clamps a portion of the bag from outside the bag.

7. The cartridge according to claim 6 ,

wherein the clamping member includes a clamping portion that clamps the bag and an expansion holding portion that is configured to communicate the first container and the second container with each other by holding a portion of the bag in a state of being expanded, and

a rigidity member is configured to heighten rigidity of the bag, the rigidity member is joined to a portion of the bag overlapping with the expansion holding portion.