Apparatus for cutting a packaging material for a package

1. An apparatus for cutting a packaging material ( 4 ) for a package, comprising:

an ultrasonic welding device ( 2 ) that includes a sonotrode ( 3 ) and an anvil ( 5 ) for sealing the packaging material ( 4 ), the sonotrode ( 3 ) being rotatable about a first axis of rotation (X) and the anvil ( 5 ) being rotatable about a second axis of rotation (Y), and

a cutting device ( 6 ) which includes at least one knife ( 7 ) for cutting the packaging material ( 4 ) and which is arranged within the anvil ( 5 ), characterized in that the knife ( 7 ) has a blade ( 8 ) with a cutting edge ( 28 ) that includes at least two tips ( 33 , 35 ) and at least two curved sections ( 22 ) interconnecting the two tips ( 33 , 35 ), wherein the cutting edge ( 28 ) comprises a straight section ( 42 ) which connects the at least two curved sections ( 22 ) to one another.

2. The apparatus according to claim 1 , characterized in that the cutting edge ( 28 ) has a bracket-shaped section ( 44 ) which comprises the at least two curved sections ( 22 ).

3. The apparatus according to claim 1 , characterized in that the straight section ( 42 ) is formed by at least two surfaces ( 29 , 31 ) converging.

4. The apparatus according to claim 3 , characterized in that the at least two surfaces ( 29 ; 31 ) are connected to one another via a raised portion ( 30 ; 36 ) or a recess ( 34 ; 32 ).

5. The apparatus according to claim 3 , characterized in that the at least two surfaces ( 29 ; 31 ) are connected to one another via a raised portion ( 30 ; 36 ) or a recess ( 34 ; 32 ) and via curved sections ( 22 ).

6. The apparatus according to claim 1 , characterized in that the tips ( 33 , 35 ) alternately protrude once with respect to one surface ( 31 ) and subsequently with respect to other surfaces ( 31 ; 29 ).

7. The apparatus according to claim 1 , characterized in that the tip ( 33 , 35 ) is alternately oriented once in the normal direction of one surface ( 31 ) and subsequently in the normal direction with respect to an other surface ( 31 ; 29 ).

8. The apparatus according to claim 1 , characterized in that the tip ( 33 , 35 ) defines an acute angle ( 38 ) in a range between 10° and 60°.

9. The apparatus according to claim 1 , characterized in that the at least one knife ( 7 ) is disposed at the anvil ( 5 ) such that a minimum spacing (S) is maintained between the sonotrode ( 3 ) and the blade ( 8 ) of the knife ( 7 ); thus enabling the packaging material ( 4 ) to be severed without contact between said sonotrode ( 3 ) and said knife ( 7 ).

10. The apparatus according to claim 1 , characterized in that the straight section ( 42 ) is formed by at least two surfaces ( 29 , 31 ) converging at an angle of approximately 90°.

11. The apparatus according to claim 10 , characterized in that at least two surfaces ( 29 ; 31 ) are disposed in the same plane and are connected to one another via a raised portion ( 30 ; 36 ) or a recess ( 34 ; 32 ).

12. The apparatus according to claim 1 , characterized in that the tip ( 33 , 35 ) defines an acute angle ( 38 ) of approximately 30°.

13. The apparatus according to claim 2 , characterized in that the straight section ( 42 ) is formed by at least two surfaces ( 29 , 31 ) converging.

14. The apparatus according to claim 13 , characterized in that the at least two surfaces ( 29 ; 31 ) are connected to one another via a raised portion ( 30 ; 36 ) or a recess ( 34 ; 32 ).

15. The apparatus according to claim 13 , characterized in that the at least two surfaces ( 29 ; 31 ) are connected to one another via a raised portion ( 30 ; 36 ) or a recess ( 34 ; 32 ) and via curved sections ( 22 ).

16. The apparatus according to claim 2 , characterized in that the straight section ( 42 ) is formed by at least two surfaces ( 29 , 31 ) converging at an angle of approximately 90°.

17. The apparatus according to claim 16 , characterized in that at least two surfaces ( 29 ; 31 ) are disposed in the same plane and are connected to one another via a raised portion ( 30 ; 36 ) or a recess ( 34 ; 32 ).

18. An apparatus for cutting a packaging material ( 4 ) for a package, comprising:

an ultrasonic welding device ( 2 ) that includes a sonotrode ( 3 ) and an anvil ( 5 ) for sealing the packaging material ( 4 ), the sonotrode ( 3 ) being rotatable about a first axis of rotation (X) and the anvil ( 5 ) being rotatable about a second axis of rotation (Y), and

a cutting device ( 6 ) which includes at least one knife ( 7 ) for cutting the packaging material ( 4 ) and which is arranged within the anvil ( 5 ), characterized in that the knife ( 7 ) has a blade ( 8 ) with a cutting edge ( 28 ) that includes at least two tips ( 33 , 35 ) and at least two curved sections ( 22 ) interconnecting the two tips ( 33 , 35 ), wherein the tip ( 33 , 35 ) is alternately oriented once in the normal direction of one surface ( 31 ) and subsequently in the normal direction with respect to an other surface ( 31 ; 29 ).

19. An apparatus for cutting a packaging material ( 4 ) for a package, comprising:

an ultrasonic welding device ( 2 ) that includes a sonotrode ( 3 ) and an anvil ( 5 ) for sealing the packaging material ( 4 ), the sonotrode ( 3 ) being rotatable about a first axis of rotation (X) and the anvil ( 5 ) being rotatable about a second axis of rotation (Y), and

a cutting device ( 6 ) which includes at least one knife ( 7 ) for cutting the packaging material ( 4 ) and which is arranged within the anvil ( 5 ), characterized in that the knife ( 7 ) has a blade ( 8 ) with a cutting edge ( 28 ) that includes at least two tips ( 33 , 35 ) and at least two curved sections ( 22 ) interconnecting the two tips ( 33 , 35 ), wherein the at least one knife ( 7 ) is disposed at the anvil ( 5 ) such that a minimum spacing (S) is maintained between the sonotrode ( 3 ) and the blade ( 8 ) of the knife ( 7 ); thus enabling the packaging material ( 4 ) to be severed without contact between said sonotrode ( 3 ) and said knife ( 7 ).