Processing

Please wait...

Settings

Settings

Goto Application

1. WO2020202147 - METHOD AND SYSTEM FOR LEVELING A LAYER IN FREEFORM FABRICATION

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

WHAT IS CLAIMED IS:

1. A method of fabricating an object in layers, the method comprising, for at least one layer:

dispensing a building material formulation to form a first portion of said layer, and leveling said first portion by a leveling device;

increasing a vertical distance between said first portion and said leveling device; and while a topmost surface of said first portion is exposed and beneath a segment of said leveling device: dispensing a building material formulation to form a second portion of said layer, laterally displaced from said first portion along an indexing direction, and leveling said second portion by said leveling device.

2. The method according to claim 1, further comprising increasing a vertical distance between said second portion and said leveling device; and

while a topmost surface of said second portion is beneath a segment of said leveling device and is exposed: dispensing a building material formulation to form a third portion of said layer, laterally displaced from said first and said second portions along said indexing direction, and leveling said third portion by said leveling device.

3. The method according to any of claims 1 and 2, further comprising solidifying each portion of said layer prior to a formation of a subsequent portion of said layer.

4. The method according to any of claims 1-3, wherein said at least one layer is a plurality of layers, and wherein for each layer of said plurality of layers, said formations of said portions are repeated at the same order.

5. The method according to any of claims 1-4, wherein said leveling device extends over a width of said layer along said indexing direction by its entirety, and is non-movable along said indexing direction.

6. The method according to any of claims 1-5, wherein said first portion and said second portions are formed from different building material formulations.

7. The method according to any of claims 1-5, wherein said first portion and said second portions are formed from the same building material formulations.

8. The method according to any of claims 1-7, wherein said dispensing is executed by a printing head of a solid freeform fabrication system, and wherein said increment of said vertical distance is by Lh/N, Lh being a height of said layer, and N being a number greater than 1.

9. The method according to any of claims 1-8, being executed by a solid freeform fabrication system which comprises:

a rotary tray configured to rotate about a vertical axis; and

a printing head, having a plurality of separated nozzles, and operable to dispense said building material during said rotation, wherein said indexing direction is a radial direction defined relative to said vertical axis.

10. The method according to claim 9, wherein said solid freeform fabrication comprises a plurality of printing heads, each configured to reciprocally move relative to said tray along said radial direction, wherein for at least two of said inkjet printing heads, said reciprocal motion is independent and at a different azimuthal angle.

11. A solid freeform fabrication (SFF) system for fabricating an object in layers, the system comprising:

a printing head, having a plurality of separated nozzles for dispensing one or more building material formulations;

a leveling device for leveling said dispensed building material formulation; and a controller configured to control said printing head so as to dispense a building material formulation to form a first portion of a layer, to ensure a contact between said leveling device and said first portion so as to level said first portion, to increase a vertical distance between said first portion and said leveling device following said leveling, to dispense a building material formulation so as to form a second portion of said layer that is laterally displaced from said first portion, and, while a topmost surface of said first portion is exposed and beneath a segment of said leveling device, to ensure contact between said leveling device and said second portion but not said first portion so as to level said second portion.

12. The system according to claim 11, further comprising a solidification system for solidifying each portion of said layer prior to a formation of a subsequent portion of said layer.

13. The system according to any of claims 11-12, wherein said at least one layer is a plurality of layers, and wherein said controller is configured to ensure that for each layer of said plurality of layers, said formations of said portions are repeated at the same order.

14. The system according to any of claims 11-13, wherein said leveling device extends over a width of said layer along said indexing direction by its entirety, and is non-movable along said indexing direction.

15. The system according to any of claims 11-14, comprising N printing heads, wherein said increment of said vertical distance is by Lh/N, Lh being a height of said layer.

16. The system according to any of claims 11-14, comprising a rotary tray configured to rotate about a vertical axis, wherein said printing head is operable to dispense said building material during said rotation, and wherein said indexing direction is a radial direction defined relative to said vertical axis.

17. The system according to claim 16, comprising a plurality of printing heads, each configured to reciprocally move relative to said tray along said radial direction, wherein for at least two of said inkjet printing heads, said reciprocal motion is independent and at a different azimuthal angle.