Ink refill container, ink refill system, and ink refill adapter

1. An ink refill container configured to refill ink to an ink tank provided with a needle having a flow passage,

the ink refill container comprising:

a container main body comprising an ink storage chamber configured to store ink to be refilled to the ink tank;

an ink outlet-forming portion, the ink outlet-forming portion having an ink outlet that allows the ink to flow out from the ink storage chamber;

a valve disposed in the ink outlet, the valve being configured to be opened by the needle inserted into the ink outlet and closed by removal of the needle from the ink outlet;

a cap; and

an attachment surface located lower than the ink outlet in a state that the ink outlet is directed upward,

wherein the cap is configured to be in contact with the attachment surface in a capping state that the cap covers the ink outlet.

2. The ink refill container according to claim 1 , further comprising a thread forming portion, wherein the cap is engaged with the thread forming portion in the capping state.

3. The ink refill container according to claim 2 , wherein the attachment surface protrudes further outwards in a radial direction than the thread forming portion.

4. The ink refill container according to claim 2 , wherein the attachment surface is located lower than the thread forming portion in the state that the ink outlet is directed upward.

5. The ink refill container according to claim 2 , wherein further comprising a pair of portions opposed to each other across the ink outlet, each portion extending radially outward and having a radially outward end extending vertically to the thread forming portion.

6. The ink refill container according to claim 5 , wherein the radially outward end of each of the portions has an arc shape in a plan view as seen from the ink outlet side.

7. The ink refill container according to claim 5 , wherein the cap covers the pair of the portions in the capping state.

8. The ink refill container according to claim 1 , wherein the ink outlet-forming portion includes a small-diameter portion having the ink outlet.

9. The ink refill container according to claim 8 , wherein the small-diameter portion has at least one cyclic convex portion extending along a periphery of the small-diameter portion.

10. The ink refill container according to claim 9 , wherein the cyclic convex portion is covered with the cap and radially spaced from the cap in the capping state.

11. The ink refill container according to claim 1 , wherein the cap includes a plurality of protrusions on outer peripheral surface thereof at equal intervals, the protrusions extending from a lower portion of the cap toward a top of the cap.

12. An ink refill container configured to refill ink to a printer, the printer formed with an ink storage chamber of an ink tank; a hole having a circular portion and a pair of rectangular portions continuous to and arranged on opposite sides of the circular portion; a needle in fluid communication with the ink storage chamber of the ink tank, arranged in the circular portion, and extending in a vertical direction; and a receiving surface surrounding the hole and extending in a horizontal direction intersecting the vertical direction, the ink refill container comprising:

a container main body; and

an ink outlet-forming portion connected to the container main body and having an ink outlet,

when the ink outlet is directed upward, and viewed from the ink outlet side in the vertical direction, the ink outlet-forming portion comprising:

a valve disposed in the ink outlet-forming portion and configured to be opened by the needle inserted in the ink outlet and closed by taking the ink refill container away from the needle;

a pair of horizontal surfaces provided at a position lower than a position of the ink outlet and arranged on opposite sides of the ink outlet in a first horizontal direction, each of the pair of the horizontal surfaces having end portions spaced apart with respect to each other in a second horizontal direction orthogonal to the first horizontal direction, the end portions extending in the first horizontal direction; and

a pair of convex portions extending upward from the pair of the horizontal surfaces, each of the pair of the convex portions disposed between the end portions in the second horizontal direction,

wherein the ink outlet is configured to be inserted to the circular portion of the hole and connected to the needle, and at least a part of the pair of convex portions are configured to be inserted to the pair of rectangular portions of the hole in a state that the ink refill container is attached to the printer.

13. The ink refill container according to claim 12 , wherein at least a part of the pair of the horizontal surfaces is configured to abut against at least a part of the receiving surface.

14. The ink refill container according to claim 12 , wherein the valve has one or more slits in an elastic member sealing the ink outlet, and is opened in a state that the one or more slits are pushed inward from outside the ink outlet.

15. The ink refill container according to claim 12 , wherein the pair of the horizontal surfaces have first end surfaces in the first horizontal direction,

the pair of the convex portions have second end surfaces in the first horizontal direction, and

the first end surfaces are flush with the second end surfaces.

16. The ink refill container according to claim 12 , further comprising a cap configured to cover the ink outlet and the pair of the convex portions.