Tube valve, a tube valve apparatus and a head cleaning apparatus

1. A tube valve comprising:

a tube defining a flow path therein through which a fluid flows, the tube being arranged so that a part of the tube forms at least one curved portion, the curved portion having a bendable part where the tube can be bent; and

an opening/closing mechanism which closes the flow path by folding the curved portion of the tube into a substantial M shape by bending the bendable part of the curved portion and opens the flow path by releasing a fold of the curved portion.

2. The tube valve as claimed in claim 1 , wherein the opening/closing mechanism comprises a rotating element which is rotatably provided and has a cam portion, and a rotation of the rotating element makes the cam portion thereof operate to bend the bendable part so that the curved portion is folded.

3. The tube valve as claimed in claim 2 , further comprising a moving element having a support portion that supports the tube at the bendable part of the curved portion and a contact portion that makes contact with the cam portion of the rotating element;

wherein the rotation of the rotating element makes the cam portion push the contact portion of the moving element to move the moving element, whereby a movement of the moving element makes the bendable part be bent to fold the curved portion.

4. The tube valve as claimed in claim 1 , further comprising a guide for controlling a bending direction of the curved portion.

5. The tube valve as claimed in claim 1 , wherein the at least one curved portion includes two curved portions, and the opening/closing mechanism opens and/or closes the flow path at the two curved portions of the tube wherein the tube valve is constructed so that the opening/closing operation of the opening/closing mechanism makes the flow path between the two curved portions of the tube be filled with the fluid and then makes the filled fluid be discharged outside the tube valve.

6. The tube valve as claimed in claim 5 , wherein the tube valve is provided so that a pressure at one end of the tube is higher than a pressure at the other end of the tube, and wherein the tube valve is constructed so that the opening/closing operation of the opening/closing mechanism makes the flow path between the two curved portions of the tube be filled with the fluid from the one end of the tube and then makes the filled fluid be discharged outside the tube valve from the other end of the tube.

7. The tube valve as claimed in claim 6 , wherein, when the filled fluid is discharged from the flow path between the two curved portions, the tube is folded at any one of the two curved portions by means of the opening/closing mechanism to close the flow path.

8. The tube valve as claimed in claim 7 , wherein the one curved portion at which the tube is folded is located on the side of the one end that is under the higher pressure than the other end.

9. The tube valve as claimed in claim 6 , wherein, when the flow path between the two curved portions is filled with the fluid, the tube is folded at any one of the two curved portions by means of the opening/closing mechanism to close the flow path.

10. The tube valve as claimed in claim 9 , wherein the one curved portion at which the tube is folded is located on the side of the one end that is under the lower pressure than the other end.

11. The tube valve as claimed in claim 5 , wherein the opening/closing mechanism always folds the tube at any one of the two curved portions to close the flow path.

12. The tube valve as claimed in claim 5 , further comprising adjusting means for adjusting the amount of fluid that is filled in the flow path between the two curved portions by adjusting the length of the tube between the two curved portions.

13. The tube valve as claimed in claim 5 , wherein each of the two curved portions has a bendable part where the tube can be bent, and the tube is folded by bending the bendable part.

14. The tube valve as claimed in claim 13 , further comprising two guides which respectively control bending directions of the tube at the two curved portions.

15. The tube valve as claimed in claim 14 , wherein the two guides respectively include a first moving element which is movably provided and has a support portion that supports the tube at the bendable part of one of the two curved portions and a second moving element which is movably provided and has a support portion that supports the tube at the bendable part of the other curved portion.

16. The tube valve as claimed in claim 14 , wherein the two guides respectively include a first moving element which is movably provided and has a contact portion that makes contact with the tube at one of the two curved portions and a second moving element which is movably provided and has a contact portion that makes contact with the tube at the other curved portion.

17. The tube valve as claimed in claim 13 , wherein the opening/closing mechanism comprises a rotating element which is rotatably provided and has a cam portion, and the rotation of the rotating element makes the cam portion thereof operate to bend the bendable part so that the tube is folded.

18. The tube valve as claimed in claim 17 , further comprising:

a first moving element which is movably provided and has a support portion that supports the tube at the bendable part of one of the two curved portions and a contact portion that makes contact with the cam portion of the rotating element; and

a second moving element which is movably provided and has a support portion that supports the tube at the bendable part of the other curved portion and a contact portion that makes contact with the cam portion of the rotating element;

wherein the rotation of the rotating element makes the cam portion push the contact portion of the first moving element, whereby the movement of the first moving element makes the corresponding bendable part be bent to fold the tube, and wherein the rotation of the rotating element makes the cam portion push the contact portion of the second moving element, whereby the movement of the second moving element makes the corresponding bendable part be bent to fold the tube.

19. The tube valve as claimed in claim 17 , further comprising:

a first moving element which is movably provided and has a contact portion that makes contact with the tube at one of the two curved portions and a contact portion that makes contact with the cam portion of the rotating element; and

a second moving element which is movably provided and has a contact portion that makes contact with the tube at the other curved portion and a contact portion that makes contact with the cam portion of the rotating element;

wherein the rotation of the rotating element makes the cam portion push the contact portion of the first moving element, whereby the movement of the first moving element makes the tube be folded, and wherein the rotation of the rotating element makes the cam portion push the contact portion of the second moving element, whereby the movement of the second moving element makes the tube be folded.

20. The tube valve as claimed in claim 1 , wherein the tube is restored from a bent state to a released state by a self-restoring force thereof to open the flow path.

21. The tube valve as claimed in claim 20 , further comprising restoration assisting means for assisting restoration of the tube.