Device and method for producing a three dimensional object

1. A device for producing a three dimensional object from a powdery material by solidifying layer by layer the powdery material through the application of energy, the device comprising:

a working surface;

an application device configured to apply predefined, locally different amounts of powdery material of the powdery material onto the working surface; and

a solidifying device configured to solidify the powdery material applied onto the working surface,

wherein the application device comprises

a transfer device, which can be magnetized and/or can be electrostatically charged and discharged and which is configured to transfer the powdery material to the working surface; and

a magnetizing or charging device configured to magnetize or electrostatically charge and discharge the transfer device.

2. The device as claimed in claim 1 , wherein the magnetizing or charging device is configured to locally magnetize or electrostatically charge and discharge the transfer device at predefined positions.

3. The device as claimed in claim 1 , wherein the transfer device has a same width extension or length extension as the working surface.

4. The device as claimed in claim 1 , wherein the transfer device is a roller or a plate.

5. The device as claimed in claim 4 , wherein the roller has a circumference corresponding to a width extension of the working surface in a rolling direction of the roller.

6. The device as claimed in claim 1 , further comprising:

a supply device configured to store the powdery material that is to be placed onto the working surface.

7. The device as claimed in claim 6 , wherein the supply device has a same length or width extension as the transfer device or the working surface.

8. The device as claimed in claim 6 , wherein the magnetizing or charging device is configured to

magnetize or charging a transfer device, which is arranged in or over the supply device, at predefined positions; and

demagnetize or discharge the transfer device, which is arranged on or over the working surface, at the predefined positions.

9. The device as claimed in claim 6 , wherein the transfer device is a roller rotatably mounted over the supply device or the working surface.

10. The device as claimed in claim 6 , further comprising:

a motion device configured to move the transfer device between the supply device and the working surface.

11. The device as claimed in claim 10 , wherein the motion device is configured to move the transfer device in three spatial directions or to rotate or pivot the transfer device.

12. The device as claimed in claim 10 , further comprising:

a control unit configured to control the magnetizing or charging device, the motion device, or the solidifying device.

13. The device as claimed in claim 1 , wherein the working surface is adjustable in a height direction.

14. A method for producing a three dimensional object from a powdery material by means of selective solidification through the application of energy, wherein the object is produced layer by layer in such a way that a layer of a powdery material is applied and solidified on a working surface; and wherein applying of the layer of powdery material comprises the steps of:

a) positioning a transfer device for applying the powdery material on the working surface over or in a supply device;

b) magnetizing or electrostatically charging the transfer device at predefined positions, so that the powdery material is deposited on the transfer device;

c) moving the transfer device on or over the working surface;

d) demagnetizing or discharging the transfer device at predefined positions, so that the powdery material falls onto the working surface at predefined positions.

15. The method as claimed in claim 14 , wherein following the selective solidification of the powdery material, the working surface is lowered and an additional layer of the powdery material is applied.