Tightener

1. A tensioning device for an endless transport belt, wherein the tensioning device comprising two tensioning edges and at least one spring section integrally formed with the tensioning edges and at least partially located between the two tensioning edges, wherein the belt circumscribes the two tensioning edges and the at least one spring section, the belt being deflectable around the two tensioning edges.

2. The tensioning device as claimed in claim 1 , wherein the at least one spring section comprises two spring sections.

3. The tensioning device as claimed in claim 2 , wherein the two spring sections are symmetrically distributed in a direction parallel to the tensioning edges.

4. The tensioning device as claimed in claim 1 , wherein the spring section is omega-shaped.

5. The tensioning device as claimed in claim 1 , wherein the spring section is S-shaped, double S-shaped or Z-shaped.

6. The tensioning device as claimed in claim 1 , wherein two overexpansion abutments contactable with each other are provided between the two tensioning edges.

7. The tensioning device as claimed in claim 6 , wherein the overexpansion abutments have a distance of 3 to 12 mm from each other.

8. The tensioning device as claimed in claim 6 , wherein at least one of the overexpansion abutments is connected by a plate-shaped section and/or by stays with the adjoining tensioning edge.

9. The tensioning device as claimed in claim 1 , wherein the tensioning device is made of a plastic material.

10. The tensioning device as claimed in claim 6 , wherein the tensioning edges, the at least one spring section and optionally the overexpansion abutments have a continuously constant material thickness.

11. The tensioning device as claimed in claim 10 , wherein the material thickness is 2 mm to 5 mm.

12. The tensioning device as claimed in claim 1 , wherein a bearing element can be plugged onto the tensioning device.

13. A gripper system comprising a transport belt for collecting or transporting products, and the tensioning device as claimed in claim 1 .

14. A method for manufacturing a tensioning device for an endless transport belt, wherein predetermined portions are removed from a plate so that the plate contains two tensioning edges around which the transport belt is deflectable, and at least one spring section is integrally formed with the tensioning edges and arranged between the two tensioning edges.

15. A tensioning device for a transport belt, the tensioning device comprising: a plate comprising a front tensioning edge, a rear tensioning edge, spaced from, and generally parallel to, the front tensioning edge, a first side edge extending between and connecting the front and rear edges, and a second side edge, spaced apart and generally parallel to the first side edge, extending between and connecting, the front and rear edges, the transport belt being deflectable around at least one of the tensioning edges, and at least one of the side edges having at least one spring section integrally formed with the plate and arranged between the two tensioning edges.

16. The tensioning device as claimed in claim 15 , wherein the at least one spring section comprises two spring sections.

17. The tensioning device as claimed in claim 16 , wherein the spring section is omega-shaped.

18. The tensioning device as claimed in claim 1 , wherein the tensioning device is made of a plastic material.

19. The tensioning device as claimed in claim 16 , wherein the spring sections extends inwardly towards each other, away from a respective one of the side edges.

20. The tensioning device as claimed in claim 19 , wherein each spring section includes a neck having spaced apart neck portions and a base having spaced apart base portions, the neck portions being closer to each other than the base portions.

21. The tensioning device as claimed in claim 1 , wherein the tensioning edges and the spring section are substantially coplanar.