Liquid storage container unit

1. A liquid storage container unit comprising:

a liquid storage container provided with an injection port for injecting a liquid therethrough;

a plug which is provided with a front edge for closing the injection port and is attachable to and detachable from the injection port;

a support member which connects the plug and a member other than the plug and elastically supports the plug,

wherein the plug takes at least a first state, in which the plug closes the injection port, and a second state, in which the plug opens the injection port and stands by, and

the front edge of the plug faces in the direction toward the support member in the second state.

2. The liquid storage container unit according to claim 1 , wherein the support member is a molded component which is shaped to have a curved portion and which is configured such that the front edge of the plug faces toward an inner side surface of the curved portion of the support member, with no force being applied.

3. The liquid storage container unit according to claim 1 , further comprising:

a first structure formed on the front edge of the plug and a second structure formed on the support member,

wherein the first structure and the second structure are engageable with each other to fix the plug in the second state.

4. The liquid storage container unit according to claim 1 , further comprising a backup member that comes in contact with the support member from the side of the support member opposite to the side of the support member toward which the front edge of the plug faces in the second state.

5. A liquid storage container unit comprising:

a liquid storage container provided with an injection port for injecting a liquid therethrough;

a plug which is provided with a front edge for closing the injection port and is attachable to and detachable from the injection port;

a support member which connects the plug and a member other than the plug and elastically supports the plug,

wherein the plug takes at least a first state, in which the plug closes the injection port, and a second state, in which the plug opens the injection port and stands by, and

the front edge of the plug is located between a position at which the support member connects to the other member and the injection port in the second state.

6. The liquid storage container unit according to claim 5 , wherein the support member is a molded component which is shaped to have a curved portion and is configured such that the plug is located between the position where the support member connects to the other member and the injection port, with no force is being applied.

7. The liquid storage container unit according to claim 5 , further comprising:

a first structure formed on the front edge of the plug and a second structure formed on the other member,

wherein the first structure and the second structure are fittable to or engageable with each other to fix the plug in the second state.

8. A liquid storage container unit comprising:

a liquid storage container provided with an opening;

a plug which is attachable to and detachable from the opening and is provided with a front edge to be inserted in the opening;

a support member which connects the plug and a member other than the plug and supports the plug,

wherein the support member is formed into a shape having a curved portion, and

the front edge of the plug is closer to an inner side surface of the curved portion of the support member in a state in which the plug is removed from the opening than in a state in which the plug is attached to the opening.

9. The liquid storage container unit according to claim 8 , wherein in the state in which the plug is removed from the opening, the front edge of the plug faces toward the inner side surface of the support member.

10. The liquid storage container unit according to claim 8 , wherein the other member is the liquid storage container.

11. The liquid storage container unit according to claim 8 , wherein the plug and the support member are integrally molded.

12. The liquid storage container unit according to claim 8 , wherein a supply tube through which a liquid is supplied is connected to a liquid discharge head provided in a liquid discharge device.

13. A liquid storage container unit comprising:

a liquid storage container provided with an opening;

a plug which is attachable to and detachable from the opening and provided with a front edge to be inserted in the opening;

a support member which connects the plug and a member other than the plug and supports the plug,

wherein the plug is fixable to a portion other than the opening, and

in a state in which the plug is fixed to the other portion, the support member is curved and the front edge of the plug comes closer to an inner side surface of a curved portion of the support member than in a state in which the plug is attached to the opening.

14. The liquid storage container unit according to claim 13 , further comprising a backup member that comes in contact with a surface opposite to the inner side surface of the support member.

15. The liquid storage container unit according to claim 14 , wherein the other portion is a part of the backup member.

16. The liquid storage container unit according to claim 13 , wherein the other portion is a part of the inner side surface of the support member.

17. The liquid storage container unit according to claim 13 , wherein in a state in which the plug is fixed to the other portion, the front edge of the plug faces toward the inner side surface of the support member.