KR20160141144A - 3-dimensional laser sintering printer - Google Patents

3-dimensional laser sintering printer Download PDF

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Publication number
KR20160141144A
KR20160141144A KR1020150075095A KR20150075095A KR20160141144A KR 20160141144 A KR20160141144 A KR 20160141144A KR 1020150075095 A KR1020150075095 A KR 1020150075095A KR 20150075095 A KR20150075095 A KR 20150075095A KR 20160141144 A KR20160141144 A KR 20160141144A
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KR
South Korea
Prior art keywords
powder
chamber
elevating
unit
laser
Prior art date
Application number
KR1020150075095A
Other languages
Korean (ko)
Inventor
박종복
한수욱
임정운
김윤현
임영은
Original Assignee
한국광기술원
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Priority to KR1020150075095A priority Critical patent/KR20160141144A/en
Publication of KR20160141144A publication Critical patent/KR20160141144A/en

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    • B29C67/0085—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling

Abstract

The present invention relates to a three-dimensional laser sintering printer apparatus, and more particularly, to a three-dimensional laser sintering printer apparatus comprising a working chamber in which a powder is received and a product is manufactured, a supply chamber for supplying powder to the working chamber, And a recovery chamber for recovering powder dispersed in a region other than the working chamber; A first elevating part for elevating the powder contained in the supply chamber; A transfer unit for transferring the powder in the supply chamber to the work chamber; A laser irradiating unit for irradiating a surface of the powder supplied to the working chamber with a laser; A second elevating part for lowering the powder supplied to the working chamber; A control unit for controlling operations of the first elevating unit, the second elevating unit, the conveying unit, and the laser irradiating unit; And a recovery unit provided below the main body for recovering the powder contained in the recovery chamber.
The three-dimensional laser sintering printer apparatus according to the present invention can simplify the structure of an expensive SLS type three-dimensional printer to reduce the volume of the apparatus and to miniaturize the apparatus. In addition, It is possible to distribute the powder evenly and easily collect the powder dispersed to the area outside the working surface, thereby improving the ease of collection and reducing the waste of the powder.

Description

3-dimensional laser sintering printer [0002]

The present invention relates to a three-dimensional laser sintering printer apparatus, and more particularly, to a three-dimensional laser sintering printer apparatus capable of easily collecting powder dispersed in a region deviating from a work surface, thereby improving the ease of collection and reducing the waste of the powder. And a printer device.

In the field of three-dimensional molding, a method of completing the molding of a three-dimensional molding while layering a material by using three-dimensional sectional shape data of the three-dimensional molding is widely used. Examples of the three-dimensional molding system to which such a three-dimensional molding method is applied are 3DP (Three Dimensional Printing) system, SLS (Selective Laser Sintering) system and SLA (Stereo Lithography Apparatus) system.

First, in a 3DP (Three Dimensional Printing) system, the powder material contained in the material accommodating chamber is supplied stepwise by the material thickness of the three-dimensional molding to the molding table of the molding chamber by the material supply roller (or braid). Then, the printing head, which is a material hardening device, moves in correspondence with the coordinates of the three-dimensional cross-sectional data, and injects an adhesive material onto the powder material in the area corresponding to each cross-section to laminate the cross-sectional shapes. However, in the 3D molding system of the 3DP method, since the curing apparatus for curing the powder material uses the adhesive material injection method by the printing head, it is difficult to precisely control the injection region of the adhesive material, It has a disadvantage that it is difficult to mold the molding.

Next, as in the 3DP system, the SLS (Selective Laser Sintering) system supplies the powder material stored in the material accommodating chamber to the shaping table of the shaping chamber step by step as much as the thickness of the section forming the three-dimensional molding. However, unlike the 3DP system, Is provided in a laser system. In this laser type curing apparatus, after a laser beam generated from a laser generator is amplified by a beam amplifier through a reflection mirror, the irradiation direction and the focus position are controlled in a galvanometer controlled by itself, The powder material in the region corresponding to each cross section of the three-dimensional molding is cured and sectioned.

Meanwhile, in a SLA (Stereo Lithography Apparatus) system, a laser is irradiated to a liquid surface of a photo-curable resin distributed on a top surface of a molding table accommodated in a molding chamber to cure a region corresponding to three- It forms. Here, the configuration of the laser curing apparatus of the SLA system may have a configuration such as a laser generator, a reflection mirror, a beam amplifier, and a galvanometer, in the same manner as the curing apparatus of the SLS system.

However, the above-described SLS system and SLA system have a disadvantage in that it is very difficult to form fine precise three-dimensional molding, especially, nanoscale three-dimensional molding. However, in order to minimize the focus change of the laser beam and to cure the material at a relatively high speed, the irradiation region of the laser beam is divided in the three-dimensional cross-sectional data, and then the multi-laser curing However, this requires expensive laser devices, which leads to a problem of significantly increasing the production cost of a three-dimensional molding system.

Further, in the conventional SLS system, when the powder material accommodated in the material accommodating chamber is supplied to the shaping table of the shaping chamber by the blade or roller, most of the powder material moves to the shaping table, but some of the powder material moves to the shaping table There is a problem that it is considerably cumbersome and difficult to collect after the modeling of the molding is completed after being pushed to the edge.

KR 10-2002-0087250 A KR 10-2005-0062161 A

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to simplify the structure of an expensive SLS type 3D printer, A three-dimensional laser sintering printer apparatus capable of uniformly distributing powder throughout the work surface and easily collecting powder dispersed in an area outside the working surface, thereby increasing the ease of collection and reducing the waste of the powder It has its purpose.

According to an aspect of the present invention, there is provided a three-dimensional laser sintering printer apparatus comprising: a working chamber in which a powder is received and a product is manufactured; a supply chamber for supplying powder to the working chamber; A main body having a recovery chamber for collecting powder dispersed in a region other than the working chamber in a process of transferring the powder; A first elevating part for elevating the powder contained in the supply chamber; A transfer unit for transferring the powder in the supply chamber to the work chamber; A laser irradiating unit for irradiating a surface of the powder supplied to the working chamber with a laser; A second elevating part for lowering the powder supplied to the working chamber; A control unit for controlling operations of the first elevating unit, the second elevating unit, the conveying unit, and the laser irradiating unit; And a recovery unit provided below the main body for recovering the powder contained in the recovery chamber.

The first elevating portion includes a first elevating plate provided in the supply chamber so as to be movable up and down along the supply chamber, a first driving portion for elevating and lowering the first elevating plate, a second driving portion for guiding the movement of the first elevating plate The second lifting plate includes a second lifting plate installed in the supply chamber so as to be movable up and down along the working chamber, a second driving unit for lifting and lowering the second lifting plate, And a second guide for guiding the movement of the two lifting plate, wherein the feeding unit includes a feed motor provided on one side of the body corresponding to the feed chamber, a drive pulley rotated by the feed motor, A driven pulley which rotates in conjunction with the drive pulley by means of the drive pulley, a first driven shaft which rotatably supports the driven pulley, A second driven shaft rotatably supported on the other side of the main body corresponding to the working chamber, the second driven shaft having a first pulley member and a second pulley member, A second timing belt which is connected to the first pulley member and the second pulley member so as to communicate with the first pulley member and the second pulley member, And a blade for moving the powder in the supply chamber to the working chamber, wherein the laser irradiating unit includes a laser generator, a laser generator, And a scanning mirror which reflects the laser beam passing through the optical lens to the powder surface of the working chamber .

And a tension adjusting pulley provided on the outer side of the body between the first pulley member and the third pulley member so as to adjust the height of the second timing belt so as to be adjustable up and down.

And a heater for applying heat to the powder on the work chamber.

The three-dimensional laser sintering printer apparatus according to the present invention can simplify the structure of an expensive SLS type three-dimensional printer to reduce the volume of the apparatus, thereby reducing the size of the apparatus. In addition, It is possible to distribute the powder evenly and easily collect the powder dispersed to the area outside the working surface, thereby improving the ease of collection and reducing the waste of the powder.

1 is a perspective view of a three-dimensional laser sintering printer apparatus according to the present invention.
2 is a perspective view showing the inside of the three-dimensional laser sintering printer apparatus shown in FIG. 1;
3 is a side view for explaining the operation of the three-dimensional laser sintering printer apparatus shown in Figs. 1 and 2. Fig.
Fig. 4 is a side view for explaining the operation of the three-dimensional laser sintering printer apparatus shown in Figs. 1 and 2. Fig.

Hereinafter, a three-dimensional laser sintering printer apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 show a three-dimensional laser sintering printer apparatus according to the present invention. 1 to 4, a three-dimensional laser sintering printer apparatus according to the present invention includes a main body 100; A first elevating part (200); A transfer unit 300; A laser irradiation unit 400; A second lifting part 500; A control unit; And a recovery unit (600).

The main body 100 includes a working chamber 120 accommodating powder inside and a product manufactured therein, a supply chamber 110 for supplying powder to the working chamber 120, And a recovery chamber 130 for recovering powder dispersed in a region other than the working chamber 120 in the process of transferring the powder.

The main body 100 includes a front plate 101 and a rear plate 102 which are arranged to face each other and are spaced apart from each other by a predetermined distance and a rear plate 102 which is disposed between the front plate 101 and the rear plate 102, And a side plate 103 connecting the front plate 101 and the rear plate 102 to form a space portion on the inside. The front plate 101, the rear plate 102, and the side plates 103 are coupled such that the tops thereof are at the same height.

The main body 100 further includes an outer plate 014 coupled to upper edge portions of the front plate 101 and the rear plate 102 to be separated from the side plates 103, And an upper plate 105 installed to contact the upper ends of the rear plate 102 and the outer plate 014. [ In order to expose the inside of the main body 100, that is, the space portion, more specifically, a supply chamber 110 to be described later and an opening portion having a predetermined area opened to expose the working chamber 120 are formed at the center side of the upper plate 105 .

The supply chamber 110 and the working chamber 120 are fixed to the inside of the main body 100 with respect to the front plate 101 and the back plate 102 between the side plates 103 of the main body 100, A first partition plate 141 and a second partition plate 142 which are spaced apart from each other and arranged in parallel with each other and a space formed between the first partition plate 141 and the second partition plate 142, A fourth partition plate 144 disposed between the side plate 103 and the third partition plate 143 on the one side and a fourth partition plate 144 disposed on the other side plate 103 and a third partition plate A fifth partition plate 145 disposed between the three partition plates 143 and a sixth partition plate 146 joined to the lower ends of the first partition plate 141 to the fifth partition plate 145 to form a bottom, And a second accommodating space that is independent from each other by a partition plate portion including the first accommodating space and the second accommodating space.

The elevation height of the first elevating portion and the elevating height of the second elevating portion are the same, and the cross section of the supply chamber is formed larger than the cross section of the working chamber. This is to allow the powder of the supply chamber, which is raised by the first lifting part to be exposed to the outside, to fill the upper empty space of the work chamber lowered by the second lifting part, thereby maximizing the utilization of the space It is. That is, when the cross-sectional area of the supply chamber and the working chamber is the same or smaller, it is necessary to raise the first elevating portion more than the second elevating portion and to prevent the supply of the material from being cut off because the space of the working chamber is not utilized . The ratio of the cross-sectional area of the supply chamber to the working chamber is preferably 1.3: 1 or 1.4: 1.

The recovery chamber 130 is a space formed between the main body 100 and the partition plate, more specifically, the space between the front plate 101 and the first partition plate 141, the rear plate 102, A space formed between the first partition plate 142 and the first side plate 103 and the fourth partition plate 144 and between the side plate 103 and the fifth partition plate 145 on the other side. The space formed in the recovery chamber 130 is formed to communicate with a space portion on the lower side of the main body 100.

The first lift part 200 lifts the powder contained in the supply chamber 110 and the first lift part 200 moves along the supply chamber 110 inside the supply chamber 110 A first guide 240 for guiding the movement of the first lifting plate 210, a second lifting plate 210 for lifting and lowering the first lifting plate 210, . The first driving part includes a first lifting rod 220 having one end fixed to the lower portion of the first lifting plate 210 and the other end extending downward through the sixth partitioning plate 146, And a first driving motor 230 for moving the rod 220 up and down. The first guide 240 is formed as a pair at the periphery of the first lifting rod 220, So as to guide the movement of the first lifting plate 210.

The second elevating part 500 described later also includes the second elevating plate 510, the second driving part, and the second guide 540 in the same manner as the first elevating part 200, The second lifting rod 520 and the second guide 540. [

The transfer unit 300 is for transferring the powder of the supply chamber 110 to the work chamber 120 and includes a feed motor 311 installed at one side of the main body 100 corresponding to the feed chamber 110 A driven pulley 313 rotated by the first timing belt 314 in conjunction with the drive pulley 312 and a second driven pulley 313 rotating in conjunction with the drive pulley 312 by a first timing belt 314, A first pulley member 316 and a second pulley member 317 provided at both side ends of the first driven shaft 315, A second workpiece coaxial shaft 318 which is parallel to the first workpiece coaxial shaft 315 and rotatably supported on the other side of the main body 100 corresponding to the work chamber 120; A third pulley member 319 and a fourth pulley member 320 provided at both side ends of the first pulley member 316 and the third pulley member 319, A slider 322 which is movable along the longitudinal direction of the main body 100 at an upper portion of the main body 100 while being fixed to the second timing belt 321, 322) for moving the powder of the supply chamber (110) to the working chamber (120).

An elastic spring for biasing the blade 323 downward against the slider 322 is further provided between the slider 322 and the blade 323. [

Although not shown in the drawings, the tension of the second timing belt 321 can be adjusted on the outside of the main body 100 between the first pulley member 316 and the third pulley member 319, A tension adjusting pulley that is adjustably installed may be further provided.

The laser irradiation unit 400 irradiates a laser to the surface of the powder supplied to the working chamber 120 and includes a laser generator 410 and an optical lens for condensing the laser emitted from the laser generator 410 And a scanning mirror 430 that reflects the laser beam passing through the optical lens 420 to the powder surface of the work chamber 120.

The second elevating part 500 is for lowering the powder supplied to the working chamber 120 and the second elevating part 500 is for holding the working chamber 120 inside the supplying chamber 110 A second driving unit for moving the second lifting plate 510 and a second guide 540 for guiding the movement of the second lifting plate 510. The second lifting plate 510 is movable upward and downward, . Since the second elevating part 500 is different from the first elevating part 200 only in the installation position, the structure of the second elevating part 500 is the same.

The controller controls the operations of the first and second lifting and lowering units 200 and 500 and the transporting unit 300 and the laser irradiating unit 400. The control unit controls the first lifting unit 200 And controls the second lift unit 500 to be lowered by a set height every predetermined cycle. At this time, the operations of the first elevator 200 and the second elevator 500 can be performed at the same time.

The recovery unit 600 is disposed below the main body 100 and collects the powder contained in the recovery chamber 130. The recovery unit 600 is installed in a drawer on the lower side of the main body 100, And a space portion in which the powder is received is formed inside. A powder falling down to the bottom of the main body 100 is received in the collecting part 600 through the collecting chamber 130.

Although not shown in the drawing, a three-dimensional laser sintering printer apparatus according to the present invention may further include a heater for applying heat to the powder on the working chamber 120, So that the powder can be preheated before work on the surface of the powder through the irradiation part 400 so that a quick work can be performed.

Hereinafter, the operation of the three-dimensional laser sintering printer apparatus according to the present invention having the above-described configuration will be described with reference to FIGS. 3 and 4. FIG.

First, powder is filled in the supply chamber 110 and the working chamber 120, and the powder is spread flat so as to have the same height as the upper end of the working chamber 120. At this time, the position of the first lifting plate 210 is close to the bottom of the supply chamber 110, and the position of the second lifting plate 510 is close to the top of the working chamber 120. Then, when the work is started under the control of the control unit, the surface of the powder is sintered in a pattern corresponding to the cross-sectional shape of the product to be manufactured by irradiating laser on the powder surface of the work chamber 120 in the laser irradiation unit 400. When the laser irradiation unit 400 finishes the laser irradiation, the first lifting plate 210 is lifted upward by a predetermined height through the first lifting unit 200, (510) is lowered to the height set downward.

The slider 322 is moved from the supply chamber 110 side to the work chamber 120 side so that the blade 323 is moved to the working chamber 120 while the powder having risen higher than the upper end of the supply chamber 110 is moved And the powder is spread flat so as to have a height corresponding to the upper end of the working chamber 120. In this process, the residual powder that is not filled in the working chamber 120 falls into the recovery chamber 130, and the dropped residual powder is recovered in the recovery unit 600.

After the powder is filled in the working chamber 120, the laser is irradiated to the upper surface of the powder through the laser irradiation unit to sinter the surface of the powder. After that, the first lift plate 210 is lowered, the second lift plate 510 is lowered, The process of transferring the powder to the work chamber 120, and the laser irradiation process are repeated. When the above process is repeated, the product is completed in the work chamber 120, and after the completion of the production, the second lifting plate 510 is lifted to take the product out of the work chamber 120.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It will be appreciated that other embodiments are possible.

Therefore, the scope of the true technical protection of the present invention should be determined by the technical idea of the appended claims.

100:
110: supply chamber
120: working chamber
130: Recovery chamber
200: First elevating portion
210: first lift plate
300:
311: Feed motor
312: Driving pulley
313: Follow pulley
400: laser irradiation unit
410: laser generator
420: Optical lens
430: scanning mirror
500: second elevating portion
510: second lifting plate
600:

Claims (4)

A supply chamber for supplying the powder to the working chamber, and a powder recovered in a region other than the working chamber in the process of transferring the powder from the supply chamber to the work chamber A recovery chamber for recovering the waste water;
A first elevating part for elevating the powder contained in the supply chamber;
A transfer unit for transferring the powder in the supply chamber to the work chamber;
A laser irradiating unit for irradiating a surface of the powder supplied to the working chamber with a laser;
A second elevating part for lowering the powder supplied to the working chamber;
A control unit for controlling operations of the first elevating unit, the second elevating unit, the conveying unit, and the laser irradiating unit;
And a recovery unit provided below the main body to recover the powder contained in the recovery chamber. The method according to claim 1,
The first elevating portion includes a first elevating plate provided in the supply chamber so as to be movable up and down along the supply chamber, a first driving portion for elevating and lowering the first elevating plate, a second driving portion for guiding the movement of the first elevating plate And a second guide for guiding the first guide,
The second lifting and lowering part includes a second lifting plate installed in the supply chamber so as to be movable upward and downward along the working chamber, a second driving part lifting the second lifting plate, and a second driving part guiding the movement of the second lifting plate And a second guide,
The conveying portion includes a conveying motor provided on one side of the main body corresponding to the supply chamber, a driving pulley rotated by the conveying motor, a driven pulley rotated by the first timing belt in interlock with the driving pulley, A first pulley member and a second pulley member provided on both side ends of the first pulley shaft and the first pulley member and rotatably supporting the driven pulley; A second pulley shaft rotatably supported on the other side of the main body, a third pulley member and a fourth pulley member respectively provided at both side ends of the second driven shaft, and a third pulley member and a third pulley member, A slider that is movable along the longitudinal direction of the main body at an upper portion of the main body while being fixed to the second timing belt; A powder supply chamber of the groups comprises a blade that moves in the working chamber,
Wherein the laser irradiation unit includes a laser generator, an optical lens for condensing the laser emitted from the laser generator, and a scanning mirror for reflecting the laser beam passing through the optical lens to the powder surface of the working chamber. Laser sintering printer apparatus. 3. The method of claim 2,
And a tension adjusting pulley provided on the outer side of the body between the first pulley member and the third pulley member so as to adjust the height of the second timing belt so as to be adjustable in height up and down. Sintered printers. The method according to claim 1,
And a heater for applying heat toward the powder on the working chamber.
KR1020150075095A 2015-05-28 2015-05-28 3-dimensional laser sintering printer KR20160141144A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101855184B1 (en) * 2017-11-24 2018-05-11 원광이엔텍 주식회사 3-dimensional printer having variable laser irradiation device
WO2019103218A1 (en) * 2017-11-24 2019-05-31 원광이엔텍 주식회사 3d printer
KR20190078497A (en) * 2017-12-26 2019-07-04 참엔지니어링(주) Appatratus for forming powder layer for 3d printer and 3d printer having the same
KR20190130192A (en) * 2018-04-18 2019-11-22 울산대학교 산학협력단 3D print with variable printing space
CN110520277A (en) * 2017-04-21 2019-11-29 惠普发展公司，有限责任合伙企业 Increasing material manufacturing
KR20200017599A (en) * 2018-08-01 2020-02-19 한국생산기술연구원 Apparatus for 3d printing capable to adjust powder dispersion and method for 3d printing using the same
CN111107978A (en) * 2017-10-05 2020-05-05 惠普发展公司，有限责任合伙企业 Container with directional handle
WO2021020888A1 (en) * 2019-07-31 2021-02-04 한국기계연구원 Three-dimensional printing method enabling three-dimensional printing on one area of bed, and three-dimensional printer used therein
KR102373953B1 (en) 2020-10-15 2022-03-17 한국기계연구원 Three-dimensional printer with fixed table and up-down movable table and method for three-dimensional printing using the printer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020087250A (en) 2001-05-15 2002-11-22 사단법인 고등기술연구원 연구조합 Three-dimensional printer
KR20050062161A (en) 2003-12-19 2005-06-23 엘지전자 주식회사 Laminate manufacturing method with powder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020087250A (en) 2001-05-15 2002-11-22 사단법인 고등기술연구원 연구조합 Three-dimensional printer
KR20050062161A (en) 2003-12-19 2005-06-23 엘지전자 주식회사 Laminate manufacturing method with powder

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110520277A (en) * 2017-04-21 2019-11-29 惠普发展公司，有限责任合伙企业 Increasing material manufacturing
CN111107978A (en) * 2017-10-05 2020-05-05 惠普发展公司，有限责任合伙企业 Container with directional handle
KR101855184B1 (en) * 2017-11-24 2018-05-11 원광이엔텍 주식회사 3-dimensional printer having variable laser irradiation device
WO2019103218A1 (en) * 2017-11-24 2019-05-31 원광이엔텍 주식회사 3d printer
KR20190078497A (en) * 2017-12-26 2019-07-04 참엔지니어링(주) Appatratus for forming powder layer for 3d printer and 3d printer having the same
KR20190130192A (en) * 2018-04-18 2019-11-22 울산대학교 산학협력단 3D print with variable printing space
KR20200017599A (en) * 2018-08-01 2020-02-19 한국생산기술연구원 Apparatus for 3d printing capable to adjust powder dispersion and method for 3d printing using the same
WO2021020888A1 (en) * 2019-07-31 2021-02-04 한국기계연구원 Three-dimensional printing method enabling three-dimensional printing on one area of bed, and three-dimensional printer used therein
KR102373953B1 (en) 2020-10-15 2022-03-17 한국기계연구원 Three-dimensional printer with fixed table and up-down movable table and method for three-dimensional printing using the printer

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