Fish filleting machine

1. A fish-cutting machine for cutting fillets from the backbone of fish, the machine comprising:

a feed-line for feeding fish through the machine,

two mutually adjacent band saws arranged along said feed-line, and which function to cut on respective sides of the backbone of a fish for filleting the abdomen-bone part of the fish and thus for separating the fish into two fish fillets and a carcass,

spine cutting means arranged along said feed-line and before the band saws in a feeding direction of the feed-line, the spine cutting means comprising two mutually adjacent cutting blades for cutting of incisions in the spine part of the fish, and

fish-separating means arranged in the feeding direction after the spine cutting means and before the band saws so as to enter the incisions for separating the fillets of the fish during cutting with said band saw.

2. A machine according to claim 1 , wherein the cutting blades are circular cutting blades adapted to cut during rotation around a rotation axis.

3. A machine according to claim 1 , wherein the cutting blades are arranged mutually rotated an angle in the order of 0.6 degrees around a first axis.

4. A machine according to claim 1 , wherein the cutting blades are arranged mutually rotated an angle in the order of 0.6 degrees around a second axis.

5. A machine according to claim 1 , wherein the cutting blades are arranged mutually parallel.

6. A machine according to claim 1 , wherein the blades are provided with radially extending grooves.

7. A machine according to claim 1 , wherein the spine cutting means are arranged pivotally around an axis perpendicular to the rotation axis of the blades.

8. A machine according to claim 1 , wherein the fish-separating means comprises a fish-separating blade with a cutting front-edge arranged upstream in the feeding direction for cutting the tail part of the fish.

9. A machine according to claim 1 , wherein the fish-separating means is formed with a curved outer surface with an increasing thickness from the upstream front-edge towards the downstream rear-edge.

10. A machine according to claim 1 , wherein the fish-separating means is formed with a curved outer surface with an increasing thickness in a direction perpendicular to the feeding direction from a sharp upper edge to a wider lower edge.

11. A machine according to claim 8 , wherein the fish separating blade extends forwardly along an upper edge thereof for the defining of a cutting sword tip.

12. A machine according to claim 1 , further comprising a fish supporting inlet with a supporting surface adapted to support the fish during entrance into the feed-line in a position in relation to the spine cutting means wherein the distance between the backbone and the axis of rotation is substantially constant for various fish of the same species.

13. A machine according to claim 1 , further comprising fillet pressing means adapted to press at least a part of the fish fillet into a desired position.

14. A machine according to claim 1 , wherein the feed-line comprises a feed belt, the feed belt being arranged in a distance from a supporting surface substantially in the range of an average distance from the backbone to the spine for a fish species.

15. A machine according to claim 1 , further comprising shape forming means adapted to shape at least a part of the band saw into a desired shape and/or position.

16. A machine according to claim 1 , further comprising guiding means for guiding predetermined parts of the fish away from said band saws, so as to maintain said part to the fillet(s).

17. A machine according to claim 16 , wherein the guiding means are arranged between fillet pressing means just before the band saws in the feeding direction.

18. A machine according to claim 1 , further comprising grinding means for grinding the band saws and/or spine cutting means during operation of the machine.

19. A machine according to claim 1 , further comprising a compressor for activating fillet pressing means and/or shape forming means and/or grinding means by air pressure.

20. A machine according to claim 1 , wherein the cutting blades are operable to cut on each side of a line of vertical fishbone of the spine part.

21. A machine according to claim 1 , further comprising carcass separating means provided downstream of said band saws for ensuring that the carcass is entirely removed from the fillets.

22. A machine according to claim 21 , wherein a coupling mechanism is provided for rotating the carcass separating means upwards so as to ensure that the fillets and the carcass is not stuck in the machine.