# US 12,759,051 B2 · Recoating device and 3D printer including the same

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- Number: US 12,759,051 B2
- Document ID: US12759051B2
- Status: Granted
- Kind: B2
- Application number: 18/712,936
- Filed: 2023-12-08
- Published: 2026-06-18
- Granted: 2026-10-13
- Earliest claimed: 2022-12-30
- Assignees: Samyoung Machinery Co., Ltd.
- Applicants: Samyoung Machinery Co., Ltd.
- Inventors: Kuk Hyun Han
- Web page: https://patentgrep.com/patent/US12759051B2

## CPC

- B22F 12/67: Blades
- B29C 64/214: Doctor blades
- B33Y 30/00: Apparatus for additive manufacturing; Details thereof or accessories therefor
- B22F 10/28: Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
- B29C 64/153: using layers of powder being selectively joined, e.g. by selective laser sintering or melting
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING

## Abstract

The present invention relates to a recoating device that performs the function of evenly applying powder in a powder bed-type 3D printer and a 3D printer including the same. The recoating device of the present invention is formed to include a leveling blade that generates a flow of powder in a direction perpendicular to a moving direction of the recoating device, thereby evenly leveling powder even if the discharge amount of powder is uneven depending on a position at the front of the recoating device.

## Claims

### Claim 1

A powder-based 3D printer including;
a build plate movable in a vertical direction and on which metal or non-metal powder is solidified and stacked;
a recoating device applying powder on the build plate;
a transfer device transferring the recoating device;
a powder supply device supplying powder to the recoating device; and
a laser scanning unit or a binder jetting unit to bond the applied powder,
wherein
the recoating device includes an ejector ejecting powder and a leveler leveling the ejected powder,
the leveler includes a leveling blade formed to be adjacent to an ejection port of the ejector and leveling the ejected powder,
where a direction parallel to a proceed direction of the recoating device is referred to as a front-to-rear direction, with the proceed direction being the front and the opposite direction being the rear; a direction in which the leveling blade extends is referred to as a left-to-right direction; and a height direction perpendicular to the front-to-rear and left-to-right directions is referred to as a up-to-down direction,
the leveling blade,
when connecting outermost corners of the leveling blade, a three-dimensional shape with a front and a back is formed, wherein a portion of the front of said three-dimensional shape is recessed toward the back to form an indentation space, and an inclined surface is formed at a front lower end of the leveling blade by said indentation space,
the indentation space is defined by an indentation depth (d), which is the depth of the indentation space from the front in the front-to-rear direction; a space height (h), which is a distance in the up-to-down direction from a bottom surface of the leveling blade to an upper edge of a front opening of the indentation space; and an entry angle (φ), which is the angle of inclination between the inclined surface and the bottom surface of the leveling blade; wherein at least one of the indentation depth (d), the space height (h), and the entry angle (φ) is configured to vary depending on a position of the leveling blade in the left-to-right direction, and
wherein the leveling blade generates a flow of powder in a direction perpendicular to a movement direction of the recoating device.

### Claim 2 (depends on 1)

The powder-based 3D printer of claim 1, wherein the leveling blade has a slope so that a central portion in the left-to-right direction protrudes toward the ejection port and both sides in the left-to-right direction are inclined toward the opposite side of the ejection port.

### Claim 3 (depends on 2)

The powder-based 3D printer of claim 2, wherein the leveling blade is formed so that the protruding central portion has a certain curvature.

### Claim 4 (depends on 2)

The powder-based 3D printer of claim 2, wherein the leveling blade is formed in a straight line with the protruding central portion having a certain length.

### Claim 5 (depends on 2)

The powder-based 3D printer of claim 2, wherein the leveling blade includes a plurality of V-shaped slopes.

### Claim 6 (depends on 2)

The powder-based 3D printer of claim 2, wherein opening and closing device is formed at the ejection port to open and close the ejection port, and the opening and closing device is opened and closed according to a vibration frequency.

### Claim 7 (depends on 1)

The powder-based 3D printer of claim 1, wherein the indentation depth (d) is shallowest at a center of the leveling blade in the left-to-right direction and becomes deeper toward both sides.

### Claim 8 (depends on 1)

The powder-based 3D printer of claim 1, wherein the space height (h) is formed to be lowest at a center in the left-to-right direction and higher on both sides.

### Claim 9 (depends on 1)

The powder-based 3D printer of claim 1, wherein the entry angle (φ) is lowest at a center in the left-to-right direction and is formed to change in the form of a sine wave on both sides.

### Claim 10 (depends on 9)

The powder-based 3D printer of claim 9, wherein the recoating device further includes a compactor including an excitation device for compacting leveled powder, and the excitation device for compacting the leveled powder is formed to be controlled independently of vibration for opening and closing an opening and closing device.