Thermoform packaging machine and method

1. A thermoform packaging machine comprising:

a forming station for forming a plurality of troughs in a film;

an infeed station;

a sealing station with a sealing tool; and

a holder for receiving the plurality of troughs and retaining a product in each of the troughs, wherein the holder comprises a plurality of clamping strips disposed for movement between a product retaining position and a product loading position and wherein each of the plurality of clamping strips includes a plurality of clamping jaws;

wherein the holder is disposed for movement relative to said sealing tool in a production direction of the thermoform packaging machine.

2. The thermoform packaging machine according to claim 1 , wherein the holder comprises said clamping jaws positioned for retaining products at a plurality of positions in the troughs.

3. The thermoform packaging machine according to claim 1 , wherein the clamping strips are adapted to be moved in common by an adjustment drive relative to one another such that the clamping jaws close upon the products in the troughs in the product retaining position.

4. The thermoform packaging machine according to claim 1 , wherein the holder comprises a plurality of holding segments arranged on a circulating feed system.

5. The thermoform packaging machine according to claim 4 , wherein the holder is adapted to be intermittently conveyed in synchronism with a film conveying unit for the film in said production direction into the sealing station for pre-sealing a cover film onto the film.

6. The thermoform packaging machine according to claim 5 , wherein the holder is mechanically coupled to the film conveying unit for the film.

7. The thermoform packaging machine according to claim 1 , wherein the infeed station includes a gripper for feeding a group of flexible and partially curved products into the troughs.

8. The thermoform packaging machine according to claim 1 , wherein the holder includes a downholder configured for retaining products at a plurality of positions in the troughs and the film.

9. The thermoform packaging machine according to claim 1 , wherein the holder includes a die for a group of products, said die being vertically movable by means of a lifting device.

10. The thermoform packaging machine according to claim 9 , wherein the sealing tool is movable in a direction opposite to the production direction to a position above the die for sealing a cover film onto the film.

11. The thermoform packaging machine according to claim 1 , wherein the clamping strips are disposed for a movement in a direction substantially perpendicular to the direction of production.

12. The thermoform packaging machine according to claim 1 , wherein clamping strips are disposed in the product retaining position and engage the product in each of the plurality of the troughs as the holder, the product in each of the plurality of the troughs moves from the infeed station toward said sealing tool in the production direction.

13. A method for operating an intermittently working thermoform packaging machine for packaging a group of flexible and partially curved products, said method comprising the steps of:

forming troughs in a film;

feeding the group of products into the troughs in an infeed station, the troughs being positioned in a holder during the feeding step;

moving the holder, the troughs and the products positioned in the holder relative to the sealing tool of a sealing station in a direction of production of the thermoform packaging machine; and

retaining the products with a plurality of clamping jaws in the holder while the holder, the trough and the products are moved relative to said sealing tool.

14. The method according to claim 13 , wherein the step of retaining of the products begins when the products have been fed in, and ends after sealing.

15. The method according to claim 13 , wherein said moving the holder step further comprises moving a format of holding segments.

16. The method according to claim 13 , further comprising feeding the products into the troughs with a gripper.

17. The method according to claim 13 , further comprising the steps of sealing the products in the troughs, and conveying the holder back to the infeed station with a circulating feed system.