System for additively manufacturing composite structure

1. An additive manufacturing system configured to discharge a continuous reinforcement, comprising:

a support;

a compactor operatively connected to and movable by the support, the compactor being configured to apply a pressure to the continuous reinforcement during discharge;

a feed mechanism configured to translate toward and away from the compactor to selectively feed the continuous reinforcement during discharge; and

a cutting mechanism disposed between the feed mechanism and the compactor, the cutting mechanism being configured to:

engage the continuous reinforcement to selectively sever the continuous reinforcement into a first section and a second section, the first section being located upstream of the cutting mechanism and the second section being located downstream of the cutting mechanism, and

disengage the continuous reinforcement during feeding of the first section via the feed mechanism.

2. The additive manufacturing system of claim 1 , further including:

a first actuator operatively connected to the cutting mechanism;

a second actuator operatively connected to the feed mechanism.

3. The additive manufacturing system of claim 1 , further including a wetting mechanism located upstream of the compactor, the wetting mechanism being configured to at least partially wet the continuous reinforcement with a liquid matrix.

4. The additive manufacturing system of claim 3 , further including a supply of the continuous reinforcement located upstream of the wetting mechanism.

5. The additive manufacturing system of claim 4 , further including:

a sensor configured to generate a signal indicative of a payout of the supply; and

a controller in communication with the sensor and the cutting mechanism, the controller being configured to selectively affect at least one of a movement of the support or a severing attempt by the cutting mechanism based at least in part on the signal.

6. The additive manufacturing system of claim 4 , further including a cure enhancer configured to expose the liquid matrix to cure energy at least one of during or after application of the pressure by the compactor.

7. The additive manufacturing system of claim 4 , further including a guide disposed between the supply and the compactor, the guide having a plurality of features that separately direct reinforcements from the supply to the compactor.

8. The additive manufacturing system of claim 1 , wherein the feed mechanism is movably connected to the compactor.

9. The additive manufacturing system of claim 1 , wherein the feed mechanism is located closer to the compactor during engagement with the continuous reinforcement than during disengagement with the first section of the continuous reinforcement.

10. A print head, comprising:

a cutting mechanism configured to cut a continuous reinforcement into a first portion that is located upstream of the cutting mechanism and a second portion that is located downstream of the cutting mechanism;

a discharging end configured to discharge the second portion of the continuous reinforcement at least partially coated in a liquid matrix;

a compactor configured to compact the second portion of the continuous reinforcement during discharge from the discharging end; and

a feed mechanism configured to selectively push the first portion of the continuous reinforcement to the compactor, the feed mechanism being configured to translate:

in a first direction towards the compactor during an engagement with the first portion of the continuous reinforcement; and

in a second direction away from the compactor during a disengagement with the first portion of the continuous reinforcement.

11. The print head of claim 10 , further comprising a cure enhancer, the cure enhancer being located prior to the compactor or after the compactor, relative to a direction of movement of the continuous reinforcement through the print head.

12. The print head of claim 10 , wherein the cutting mechanism is located between the feed mechanism and the compactor.

13. The print head of claim 12 , wherein the cutting mechanism is configured to translate in a third direction to cut the continuous reinforcement, the third direction being different than the first direction and the second direction.

14. The print head of claim 10 , further comprising an actuator, the actuator being configured to actuate the cutting mechanism to cut the continuous reinforcement.

15. The print head of claim 10 , further comprising:

a spool about which the continuous reinforcement is wound;

a sensor configured to generate signals indicative of a movement of the spool; and

a controller in communication with the sensor and the cutting mechanism, the controller being configured to:

receive, at a first instance, a first signal indicative of the cutting mechanism cutting the continuous reinforcement;

receive, at a second instance after the first instance, a second signal indicative of the movement of the spool; and

cause, based at least in part on the second signal, at least one of:

the print head to stop moving, or

the cutting mechanism to cut the continuous reinforcement.

16. The print head of claim 10 , further comprising an actuator, wherein the actuator is configured to move the feed mechanism in the first direction towards the compactor and in the second direction away from the compactor.

17. The print head of claim 10 , further comprising a controller in communication with the feed mechanism, wherein the controller is configured to cause the feed mechanism to move:

in the first direction towards the compactor; and

in the second direction away from the compactor.

18. The print head of claim 10 , further comprising a wetting mechanism located upstream of the compactor, relative to a direction of movement of the continuous reinforcement through the print head, the wetting mechanism being configured to at least partially wet the continuous reinforcement with the liquid matrix.

19. The print head of claim 10 , wherein:

the print head is configured to connect to a support; and

the print head is movable by the support.

20. The print head of claim 10 , further including a guide configured to direct the first portion of the continuous reinforcement to the compactor, the feed mechanism being operably connected to the guide.