Build material application device

1. A build material application device for an apparatus for additively manufacturing three-dimensional objects by successive layerwise selective irradiation and consolidation of layers of build material with an energy beam, the build material application device being adapted to apply an amount of build material in a build plane of a respective apparatus, the build material application device comprising:

a first build material application element, the first build material application element being moveably supported in a first motion path in which the first build material application element is moved across a build plane of a respective apparatus, and in a second motion path in which the first build material application element is moved past the build plane in a direction opposite the first motion path while being laterally offset from a side of the build plane, wherein build material cannot be applied to the build plane with the first build material application element being laterally offset from the side of the build plane; and

a second build material application element, the second build material application element being moveably supported in a first motion path in which the second build material application element is moved across the build plane, and in a second motion path in which the second build material application element is moved past the build plane in a direction opposite the first motion path while being laterally offset from the side of the build plane, wherein build material cannot be applied to the build plane with the second material application element being laterally offset from the side of the build plane;

wherein the first motion path of the first build material application element and the first motion path of the second build material application element extend in the same horizontal plane, and wherein the second motion path of the first build material application element and the second motion path of the second motion path of the second build material application element extend in the same horizontal plane.

2. The build material application device according to claim 1 , wherein the first motion path extends between a start position and an end position and the second motion path extends between a start position and an end position.

3. The build material application device according to claim 2 , wherein the start position of the first motion path is laterally offset from a first side of the build plane in a build material supplying region in which an amount of build material which is to be applied in the build plane of a respective apparatus during motion of the first or second build material application element in the first motion path is supplyable or supplied, and

the end position of the first motion path is laterally offset from a second side of the build plane in a build material receiving region in which an amount of build material which was not applied in the build plane of a respective apparatus during motion of the first or second build material application element in the first motion path is receivable or received.

4. The build material application device according to claim 1 , wherein the first motion path of the first build material application element is the same as the first motion path of the second build material application element, and

the second motion path of the first build material application element is the same as the second motion path of the second build material application element.

5. The build material application device according to claim 1 , wherein the first motion path of the first build material application element and the second motion path of the first build material application element extend in the same horizontal plane, and wherein the first motion path of the second build material application element and the second motion path of the second build material application element extend in the same horizontal plane.

6. The build material application device according to claim 5 , wherein the first motion path of the first build material application element and the second motion path of the first build material application element extend in parallel and wherein the first motion path of the second build material application element and the second motion path of the second build material application element at least partially extend in parallel.

7. The build material application device according to claim 1 , wherein the first motion path of the first build material application element and the second motion path of the first build material application element extend in different horizontal planes and wherein the first motion path of the second build material application element and the second motion path of the second build material application element extend in different horizontal planes.

8. The build material application device according to claim 1 , wherein the first build material application element is moveably supported in a third motion path in which the first or second build material application element is moved from an end position of the first motion path, to a start position of the second motion path.

9. The build material application device according to claim 1 , wherein the first build material application element is moveably supported in a fourth motion path in which the first build material application element is moved from an end position of the second motion path, to a start position of the first motion path; and

wherein the second build material application element is moveably supported in a third motion path in which the second build material application element is moved from an end position of the first motion path to a start position of the second motion path.

10. The build material application device according to claim 1 , further comprising a control unit adapted to at least:

control motions of the first build material application element in the first motion path and in the second motion path; and

control motions of the second build material application element in the first motion path and in the second motion path.

11. The build material application device according to claim 10 , wherein the control unit is adapted to at least control motions of the first and second build material application elements so that the first and second build material application elements are moved simultaneously.

12. The build material application device according to claim 10 , wherein the control unit is adapted to at least control motions of the first and second build material application elements so that the first and second build material application elements are moved constantly.

13. The build material application device according to claim 1 , wherein at least one of:

the first motion path;

the second motion path;

a third motion path; or

a fourth motion path is a translational motion path.

14. The build material application device according to claim 1 , further comprising a guiding device adapted to implement a guided motion of the first and second build material application elements, the guiding device comprising:

at least one first guiding element being adapted to implement a guided motion of the first build material application element and/or the second build material application element along the first motion path; and

at least one second guiding element, the at least one second guiding element being adapted to implement a guided motion of the first build material application element and the second build material application element along the second motion path;

at least one third guiding element, the at least one third guiding element being adapted to implement a guided motion of the first build material application element and/or the second build material application element along a third motion path; and

at least one fourth guiding element, the at least one fourth guiding element being adapted to implement a guided motion of the first build material application element and the second build material application element along a fourth motion path.

15. A method for applying an amount of build material in a build plane of an apparatus for additively manufacturing three-dimensional objects by means of successive layerwise selective irradiation and consolidation of layers of build material which can be consolidated by means of an energy beam, the method comprising the steps of:

moving a first build material application element in a first motion path in which the first build material application element is moved across the build plane, and/or in a second motion path in which the first build material application element is moved past the build plane of the apparatus in a direction opposite the first motion path while being laterally offset from a side of the build plane, wherein build material cannot be applied to the build plane with the first build material application element being laterally offset from the side of the build plane, and

moving a second build material application element in a first motion path in which second build material application element is moved across the build plane of the apparatus, and in a second motion path in which the second build material application element is moved past the build plane in a direction opposite the first motion path while being laterally offset from the side of the build plane, wherein build material cannot be applied to the build plane with the second material application element being laterally offset from the side of the build plane;

wherein the first motion path of the first build material application element and the first motion path of the second build material application element extend in the same horizontal plane, and wherein the second motion path of the first build material application element and the second motion path of the second motion path of the second build material application element extend in the same horizontal plane.