Method and device for layer-wise production of patterns

1. An apparatus for the manufacture of a three-dimensional object in layers comprising

i) a device for conveying a particulate material during the manufacture of the object in layers, wherein the devise comprises

a) a reservoir,

b) a spreader unit,

c) a particulate material conveying component, and

d) a build platform on which the object is built;

wherein

the particulate material conveying component conveys the particulate material from the reservoir to the spreader unit;

the spreader unit is adapted for spreading the particulate material onto the build platform as a layer of the particulate material, and

the device includes an ejection system for filling the spreader unit with the particulate material, the ejection system including a first component having a pattern of openings and a second component having the same pattern of openings, wherein the first component moves relative to the second component for shifting the patterns of openings between an aligned configuration and a sealed configuration.

2. An apparatus for the manufacture of a three-dimensional object in layers comprising:

i) a device for conveying a particulate material during the manufacture of the object in layers, wherein the devise comprises

a) a reservoir,

b) a spreader unit,

c) a particulate material conveying component, and

d) a build platform on which the object is built;

wherein

the particulate material conveying component conveys the particulate material from the reservoir to the spreader unit;

the spreader unit is adapted for spreading the particulate material onto the build platform and

the device includes an ejection system for filling the spreader unit with the particulate material, the ejection system including a first component having a pattern of openings and a second component having the same pattern of openings, wherein the first component moves relative to the second component for shifting the patterns of openings between an aligned configuration and a sealed configuration;

wherein the first component and the second component are tubes having spaced apart openings along a bottom length of the tubes.

3. The apparatus of claim 1 , wherein the particulate material conveying component includes a screw conveyor.

4. The apparatus of claim 3 , wherein the screw conveyor runs horizontally above the spreader unit.

5. The apparatus of claim 4 , wherein the screw conveyor extends the length of the spreader unit.

6. The apparatus of claim 1 , wherein the reservoir is arranged below the spreader unit in a vertical direction, at least during a filling process.

7. The apparatus of claim 1 , wherein the apparatus includes a recirculation system for reintroducing particulate material back into the spreader after being ejected from the ejection system.

8. The apparatus according to claim 7 , wherein provision is furthermore made for a junction for introducing new particulate material into the reservoir.

9. A method of constructing a three-dimensional article in layers with a device for conveying a particulate material during the manufacture of the article in layers, wherein the devise includes a reservoir, a spreader unit, a particulate material conveying component, and a build platform on which the object is built;

the method comprising the following steps:

conveying a particulate material from the reservoir to the spreader unit with the particulate material conveying component;

filling the spreader unit with the particulate material using an ejection system; and

spreading the particulate material onto the build platform as a layer of the particulate material with the spreader unit;

wherein the ejection system includes a first component having a pattern of openings and a second component having the same pattern of openings, wherein the first component moves relative to the second component for shifting the patterns of openings between an aligned configuration and a sealed configuration.

10. The method of claim 9 , wherein the particulate material conveying component includes a screw conveyor and the method includes moving the first and/or the second component of the ejection system for sealing a bottom of the ejection system; and rotating the screw conveyor for filling the spreader while the bottom of the ejection system is sealed.

11. The method of claim 9 , wherein the method includes opening a bottom of the ejection system only after the particulate material is distributed throughout an entire length of the spreader.

12. The method of claim 9 , wherein the first component and the second component are tubes having spaced apart openings along a bottom length of the tubes, and the method includes rotating one of the tubes for aligning the openings.

13. The apparatus of claim 1 , wherein the pattern of openings includes a plurality of openings.

14. The apparatus of claim 13 , wherein gravity forces the particulate material through the plurality of openings.

15. The apparatus of claim 2 , wherein the particulate material conveying component includes a screw conveyor.

16. The apparatus of claim 15 , wherein the screw conveyor runs horizontally above the spreader unit and extends the length of the spreader unit.

17. The apparatus of claim 16 , wherein the reservoir is arranged below the spreader unit in a vertical direction, at least during a filling process.

18. The apparatus of claim 17 , wherein the apparatus includes a recirculation system for reintroducing particulate material back into the spreader after being ejected from the ejection system, wherein provision is furthermore made for a junction for introducing new particulate material into the reservoir.

19. The apparatus of claim 6 , wherein

the reservoir is arranged below the spreader unit in a vertical direction, at least during a filling process; and

the apparatus includes a recirculation system for reintroducing particulate material back into the spreader after being ejected from the ejection system, wherein provision is furthermore made for a junction for introducing new particulate material into the reservoir.