Lint collection assembly for a dryer appliance

1. A dryer appliance comprising:

a cabinet;

a drum rotatably mounted within the cabinet, the drum defining a chamber for receipt of clothes for drying;

an air handler for urging a flow of air through the chamber;

a trap duct in fluid communication with the chamber; and

a lint collection assembly operably coupled to the trap duct for filtering lint from the flow of air exiting the chamber, the lint collection assembly comprising:

a filter housing defining an aperture through which the flow of air passes;

a roller assembly comprising a supply roller for supplying a filter medium over the aperture and a collection roller for receiving the filter medium; and

a drive mechanism operably coupled to the roller assembly for rotating the supply roller and the collection roller to move the filter medium over the aperture.

2. The dryer appliance of claim 1 , wherein the drive mechanism comprises:

a motor mechanically coupled to the collection roller, the motor configured for selectively rotating the collection roller to wind up a used section of the filter medium and position a clean section of the filter medium over the aperture.

3. The dryer appliance of claim 2 , wherein the lint collection assembly further comprises:

a tensioning roller in contact with the filter medium for urging the filter medium against the filter housing over the aperture.

4. The dryer appliance of claim 3 , wherein the lint collection assembly comprises:

a biasing member for urging the tensioning roller against the filter medium to provide tension to the filter medium over the aperture.

5. The dryer appliance of claim 1 , wherein the lint collection assembly further comprises:

a drive roller positioned between the supply roller and the collection roller and being operably coupled to the filter medium; and

a motor mechanically coupled to the drive roller for selectively rotating the drive roller to move the filter medium off of the supply roller and onto the collection roller.

6. The dryer appliance of claim 5 , wherein the lint collection assembly comprises:

a biasing member for urging the drive roller against the filter medium to provide tension to the filter medium over the aperture.

7. The dryer appliance of claim 5 , wherein the filter medium defines a plurality of holes spaced down sides of the filter medium along a length of the filter medium, and wherein the drive roller comprises teeth configured for engaging the plurality of holes to move the filter medium as the drive roller rotates.

8. The dryer appliance of claim 5 , wherein the lint collection assembly further comprises:

a gear assembly operably coupling the drive roller to the collection roller.

9. The dryer appliance of claim 5 , wherein the lint collection assembly further comprises:

a friction clutch mechanically coupled to the supply roller to resist rotation of the supply roller and tension the filter medium.

10. The dryer appliance of claim 1 , wherein the lint collection assembly further comprises:

a lint detection sensor for detecting a magnitude or presence of lint collected on the used section of the filter medium.

11. The dryer appliance of claim 10 , wherein the lint detection sensor is a light sensor, an optical sensor, a tactile sensor, an acoustic sensor, a capacitive sensor, or an ultrasonic sensor.

12. The dryer appliance of claim 1 , wherein the lint collection assembly further comprises:

a cleaning mechanism for removing collected lint from a used section of the filter medium.

13. The dryer appliance of claim 12 , wherein the cleaning mechanism is operable to engage the used section of the filter medium when the filter medium is moved away from the aperture.

14. The dryer appliance of claim 12 , wherein the cleaning mechanism is pivotally mounted to the filter housing such that it is movable between a disengaged position and an engaged position.

15. The dryer appliance of claim 12 , wherein the cleaning mechanism is an elongated blade, hook, or wire brush that is that is positioned proximate the supply roller, and wherein the supply roller may be rotated in reverse to clean the used section of the filter medium and rewind the filter medium onto the supply roll.

16. The dryer appliance of claim 1 , wherein the filter medium is a roll of metal screen.

17. The dryer appliance of claim 1 , wherein the supply roller and the collection roller are positioned on opposite sides of the aperture along a lateral direction.

18. The dryer appliance of claim 16 , wherein the supply roller and the collection roller are rotatable about a vertical direction.

19. A lint collection assembly for a dryer appliance, the lint collection assembly comprises:

a filter housing defining an aperture through which a flow of air passes;

a roller assembly comprising a supply roller for supplying a filter medium over the aperture and a collection roller for receiving the filter medium;

a drive mechanism operably coupled to the roller assembly for rotating the supply roller and the collection roller to move the filter medium over the aperture;

a drive roller positioned between the supply roller and the collection roller and being operably coupled to the filter medium; and

a motor mechanically coupled to the drive roller for selectively rotating the drive roller to move the filter medium off of the supply roller and onto the collection roller.

20. The lint collection assembly of claim 19 , wherein the drive mechanism comprises:

a motor mechanically coupled to the collection roller, the motor configured for selectively rotating the collection roller to wind up a used section of the filter medium and position a clean section of the filter medium over the aperture; and

a tensioning roller in contact with the filter medium for urging the filter medium against the filter housing over the aperture.