Liquid supplying device having tank and cartridge attachable thereto

1. A liquid supplying device comprising:

a tank; and

a cartridge configured to be attached to the tank and comprising a first storage chamber configured to store liquid, the cartridge being formed with a communicating opening in communication with the first storage chamber;

the tank comprising:

a second storage chamber configured to store the liquid;

a liquid passage in communication with the second storage chamber, the liquid passage having a first end portion connected to the second storage chamber and formed with a first opening, a second end portion opposite to the first end portion and formed with a second opening open to an atmosphere, and a first vertical portion extending upward in a vertical direction from the first opening;

a gas passage in communication with the second storage chamber, the gas passage having a third end portion connected to the second storage chamber and formed with a third opening, a fourth end portion opposite to the third end portion and formed with a fourth opening open to the atmosphere, and a second vertical portion extending upward in the vertical direction from the third opening;

a joint having a part of the liquid passage formed with the second opening and a part of the gas passage formed with the fourth opening;

an outer wall having a tubular shape having inner surfaces defining an inner space;

an inner wall partitioning the inner space into the first vertical portion and the second vertical portion;

an air communication portion having an air communication opening allowing the second storage chamber to communicate with the atmosphere; and

a narrow-width portion positioned at a fifth end portion in a first direction of the tank, the first direction extending in a horizontal direction, the narrow-width portion having a width narrower than that of the cartridge in a second direction perpendicular to the first direction and extending in the horizontal direction;

wherein the first vertical portion, the second vertical portion, and the air communication portion are arranged in this order in the first direction and a direction away from the fifth end portion.

2. The liquid supplying device according to claim 1 , wherein both of the first opening and the third opening are in communication with the second storage chamber at the narrow-width portion.

3. The liquid supplying device according to claim 2 , wherein each of the first vertical portion and the second vertical portion has a width in the second direction equal to a width in the second direction of the second storage chamber at the narrow-width portion.

4. The liquid supplying device according to claim 1 , wherein the tank further has a wide-width portion having a width in the second direction greater than the width of the narrow-width portion and less than or equal to a width in the second direction of the cartridge, the second storage chamber being formed over the wide-width portion and the narrow-width portion.

5. The liquid supplying device according to claim 1 , wherein the tank further has an upper wall defining an upper surface of the second storage chamber; and

wherein the first vertical portion and the second vertical portion extend upward relative to the upper wall.

6. The liquid supplying device according to claim 1 , wherein the joint extends in the first direction;

wherein the liquid passage further has a first horizontal portion formed in the joint and extending from the second opening in the horizontal direction;

wherein the gas passage further has a second horizontal portion formed in the joint and extending from the fourth opening in the horizontal direction; and

wherein the joint is configured to be connected to the communicating opening of the cartridge in the first direction.

7. An image recording apparatus comprising:

the liquid supplying device according to claim 1 ; and

a recording portion configured to eject the liquid supplied from the tank.