WO2019009679A1

WO2019009679A1 - 3d printer for shaping three-dimensional object

Info

Publication number: WO2019009679A1
Application number: PCT/KR2018/007725
Authority: WO
Inventors: 이광민; 이병극
Original assignee: 이광민
Priority date: 2017-07-06
Filing date: 2018-07-06
Publication date: 2019-01-10
Also published as: KR20190005295A

Abstract

A 3D printer for shaping a three-dimensional object is disclosed. The 3D printer of the present invention comprises a frame, a resin tank, a modeling plate, a modeling plate driving unit, and a resin tank lifting restriction unit. The resin tank receives a shaping resin material and has a light-transmissive bottom plate installed on the frame. The modeling plate is received in the resin tank so as to support a three-dimensional object. The resin tank lifting restriction unit restricts lifting of a partial area of the resin tank such that the resin tank is lifted non-horizontally when an external lifting force is applied to the resin tank. Accordingly, the resin tank performs tilting motion, and thus a shaped object is released from the bottom plate, starting from a bottom plate portion corresponding to the position where the lifting restriction unit is installed.

Description

3D printers for forming 3D objects

The present invention relates to a 3D printer for forming a three-dimensional object.

In the photocurable 3D printer, when a molding plate is placed in a resin tank containing a liquid resin material and light energy is irradiated to a liquid resin layer between the molding plate and the bottom plate through a transparent resin base plate, the liquid resin layer And solidifies to form a solid unit molding layer. A desired three-dimensional molded product can be obtained by continuously stacking the unit shaping layers while raising or lowering the shaping plates. This type of 3D printer is called a photocurable 3D printer.

The cured molded product cured by exposure to light energy is solidified between the bottom plate and the molding plate of the resin tank and is separated and separated from the bottom plate when the molding plate is lifted to be gradually adhered to the molding plate. However, the suitability of the mold is important for the quality of the molding and is a factor in the speed and efficiency of the work. As a result, releasability is an important limiting factor in improving the quality and molding speed of 3D printing products.

It is an object of the present invention to allow the cured resin between the molding plate and the resin deck bottom to be easily released from the bottom plate of the resin bath or from the molding surface.

According to an aspect of the present invention, there is provided a 3D printer comprising: a frame; An exposure section; A resin tank accommodating a liquid resin material and provided on the frame having a molding surface on which the liquid resin material is photo-cured by an amount of light projected from the exposure unit; A molding plate accommodated in the resin tank to support the molding; A shaping plate driving unit that lifts and drives the shaping plate relative to the resin tank; And a regulating part regulating a rising or falling of the resin plate or a part of the molding plate so that the resin plate or the molding plate is raised or lowered ungraded by the rising or falling external force of the molding plate driving part And the shaping plate is released while tilting when the shaping plate is released from the shaping surface by the operation of the regulating portion interlocked with the rising or falling of the shaping plate driving portion. The 3D printer according to the present invention can be configured such that the shaping plate and the molding surface are not entirely released at one time but the mold surface is first released so that the mold release can be facilitated It is.

The regulating unit may include a regulating jaw provided in the frame and regulating an upward or downward movement of a rim region of the resin jam and a regulating jaw provided in any one of the regulating jaw and the resin jam to cause a rise or non- And a regulating protrusion. In the 3D printer according to an embodiment of the present invention, the molding plate and the molding surface adhere to each other in conjunction with the upward or downward external force of the molding plate driving unit, so that the resin bath is subjected to the upward or downward force, So that the molding surface of the molding plate and the molding surface of the resin mold is released while tilting.

The frame includes a frame body, a movable accommodating member which is disposed so as to be movable up and down with respect to the frame body to receive and support the resin tub, the movable accommodating member having the regulating jaw, and a movable accommodating member interposed between the movable accommodating member and the frame main body, The movable receiving member is resiliently lowered with respect to the frame body by a predetermined lowering width when a downward external force is applied to the movable receiving member. Due to the descent of the 3D printer movable storage member according to the present invention, the shaping plate and the resin tray bottom plate can always be kept parallel. The spring unit includes a plurality of springs arranged at a plurality of locations along the circumference of the resin bath. Each of the springs may be set to have a different falling width.

Wherein the movable housing member has a pair of mutually opposed mounting guide portions for guiding sliding attachment and detachment along the horizontal direction of the resin tank, and the regulation jaw is a partial area of any one of the pair of mounting guide portions do.

Wherein the resin reservoir has a rectangular container shape, the restriction portion is provided in one of four corner regions of the resin reservoir, and the other corner of the four corner regions is provided with an elastic spring. At other corners where no regulating part is provided, an elastic member such as a leaf spring is provided to make the tilting more smooth.

The regulating portion includes a shaping plate connecting portion provided between the shaping plate and the shaping plate driving portion to cause the shaping plate to rise or fall unevenly in association with the upward or downward movement of the shaping plate driving portion do. According to another embodiment of the present invention, in the 3D printer according to another embodiment of the present invention, the regulating part is provided at the connection part between the shaping plate and the shaping plate driving part so that the resin tank is fixed and the shaping plate is tilted so that the shaping plate and the resin molding surface can be easily released by tilting operation. do. The tilting operation of the resin tanks according to the present invention or the tilting operation of the molding plate facilitates the release of the molding plate and the molding surface. At this time, the release starts from the corner where the regulating section is installed.

As described above, in the 3D printer according to the present invention, since the molded article cured between the shaping plate and the bottom plate of the resin tank is easily released from the bottom plate or the molding surface of the resin tank, stable lamination and three-dimensional object molding are possible.

1 is an external functional diagram of a 3D printer according to an embodiment of the present invention.

2 is a perspective view of a movable storage unit and a resin tank according to the first embodiment of the present invention.

3 is a perspective view of a movable storage part and a resin tank according to a second embodiment of the present invention.

FIG. 4 is a function diagram showing the elastic state of the movable storage part lowered by a certain amount due to the lowering of the shaping plate according to the embodiment of the present invention.

FIG. 5 is a functional diagram showing a state in which the movable storage part is retracted from a predetermined lowered state at the initial stage of the rising of the shaping plate according to an embodiment of the present invention.

FIG. 6 is a functional diagram showing a state in which the rise of the resin tank is unrestrained because the rise of the resin tank is restricted by the upward regulation portion and the rise of the remaining portion of the resin tank is not regulated when the shaping plate according to the embodiment of the present invention rises .

FIG. 7 is a functional diagram showing a tilting operation in which the resin plate is fixed when the molding plate rises according to another embodiment of the present invention, the one side of the molding plate connection part is regulated, and the other side is not regulated, .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

The 3D printer 100 for molding the three-dimensional molding 1 includes a frame 10, a shaping plate 13, a shaping plate driving unit 11, a resin tank 30, an exposure unit 50, and a control unit 60 .

The frame 10 corresponds to a frame body supporting each functional unit while maintaining the overall shape of the 3D printer 100.

The frame 10 includes a spring unit 22 that allows the frame body 40, the movable storage compartment 20 and the movable compartment 20 to be lowered and raised under a certain amount of elasticity.

In the frame body (40), the movable storage portion (20) is provided under the elasticity of the spring unit (22). The movable storage portion 20 is mounted with a resin trough 30 which is freely attachable and detachable. A resin material (2) in a liquid state is contained in the resin tank (30).

The shaping plate 13 is connected to the shaping plate driving unit 11 through the shaping plate connecting portion 12. The shaping plate driving unit 11 is connected to the frame 10 and can raise or lower it by receiving a control signal from the control unit 60.

The control unit 60 controls the exposure unit 50 to control the exposure timing, the irradiation time, the irradiation energy, the size of the object, and the like.

When the shaping plate 13 is in close contact with the transparent bottom plate 32 of the resin tray 30 or a certain distance from the transparent bottom plate 32 in a state where the shaping plate 13 is immersed in the liquid resin material 2, And the liquid resin material 2 existing between the transparent bottom plate 32 of the resin trough 30 and the transparent bottom plate 32 of the resin trough 30 undergoes a curing reaction from liquid to solid under exposure of the exposure unit 50. In this case, the liquid resin layer on the lower side of the shaping plate 13 and on the upper side of the transparent bottom plate serves as a molding surface.

The liquid resin material 2 is positioned between the shaping plate 13 and the transparent bottom plate 32 even if the shaping plate 13 is closely attached to the transparent bottom plate 32 of the resin tank 30. [

When the molding plate 13 is lifted a certain distance from the transparent bottom plate 32 of the resin tank 30 in a state where the molded product 2 of the cured resin molded unit layer is attached to the molding plate 13, The resin plate 2 is filled with the liquid resin material 2 again below the transparent plate 1 and the molding plate 13 is lowered again and is separated from the transparent bottom plate 32 of the resin tank 30 by a predetermined distance, The resin of the next layer is cured under the molded article 1 which is cured by exposure. The above process is repeated to mold the three-dimensional molded product 1.

The present invention is characterized in that the cured molded article 1 between the shaping plate 13 and the transparent bottom plate 32 of the resin tank 30 is attached to the shaping plate 13 by the exposure of the

exposure unit

50, 13 in which the moldings 1 attached to the resin tanks 30 are separated from the hardened molding surfaces of the resin tanks 30.

The release of the molded article 1 from the transparent bottom plate 32 of the resin trough 30 is achieved by raising the unevenness or tilting the resin trough when the resin trough 30 rises.

The movable storage portion 20, which is a main part of the present invention, is installed under the elastic pressure of the spring 22 on the frame body 40. The movable storage portion 20 is a part of the frame 10.

The movable storage portion 20 is provided with a mounting guide portion 26 for mounting the resin tanks 30 on both sides of the rectangular base portion 23. The height of the mounting guide portion 26 from the base portion 23 to the restricting jaw 26a is greater than the height of the resin trough 30.

Therefore, when the resin trough 30 is attached to the mounting guide 26 of the movable storage portion 20, the resin trough 30 has a flow distance that flows upward and downward.

The protrusion 31 is provided at one corner of the four corners of the resin trough 30 so that the height of the resin trough 30 is adjusted to the height of the protrusion 31, When the resin reservoir 30 is mounted on the movable storage compartment 20, the height of the resin reservoir 30 of the resin reservoir 30 of the storage tank 30 is substantially the same height as the height of the storage reservoir of the storage reservoir 20 of the resin reservoir 20, Is mounted in a tightly closed state with almost no flowable distance to the top.

However, the remaining three corners except for the corner (front left corner) having the protrusion 31 among the four corners of the resin trough 30 have a flow space capable of flowing upward. Further, the flow space may be provided with a buffer member.

The transparent bottom plate 32 of the resin trough 30 is made of a transparent material and transfers the exposure of the exposure unit 50 from the bottom to the liquid resin material 2 housed in the resin tank 30. The central portion of the base portion 23 corresponding to the bottom plate of the movable storage portion 20 to which the resin trough 30 is mounted is formed in the central portion of the base portion 23, (25).

The light of the exposure section 50 can be irradiated to the transparent bottom plate 32 of the resin tank 30 through the exposure passage section 25 of the movable storage section 20, The liquid resin material 2 located between the transparent bottom plates 32 is irradiated to cure the resin material of the unit molding layer.

Four bolt holes 24 are provided in the four corner portions of the movable storage portion 20 and the four movable bolts 21 penetrate the four bolt holes 24 and four movable bolts 21, Are assembled to the frame body 40 in a state where the springs 22 are sandwiched.

The movable storage compartment 20 is installed under the elastic force of the spring 22 so that the shaping plate 13 presses the transparent bottom plate 32 of the resin tank 30 to press the shaping plate 13 and the resin tank 30, The springs 22 of the movable storage compartment 30 are also compressed so that the movable storage compartment 30 and the shaping plate 13 and the resin tanks 30 are kept parallel to each other.

Fig. 3 shows a structure most similar to the first embodiment of Fig. 2 except that it has two projections 31 and 31 '. In the second embodiment of the present invention, the operation of tilting the resin tanks is different from that of the first embodiment of the present invention. However, the same effect as the first embodiment is produced. The height of the projection of the first regulatory projection 31 is high. The height of the protrusion of the second regulatory protrusion 31 'is lower than that of the first regulating protrusion 31.

Embodiments in which the regulating portion can raise and lower unevenness by the difference in the elastic force of the buffer member provided in the flow section other than the regulating projection portion projecting from the frame or the resin tank are also included in the present invention. At this time, the corner portion provided with the cushioning member having a relatively elastic force can be a regulating portion.

FIG. 4 is a function diagram showing the elasticity state of the movable storage part when the movable plate descends by a certain amount due to the descent of the shaping plate according to an embodiment of the present invention. When the shaping plate driving portion 11 is lowered, the shaping plate 13 connected to the connecting portion 12 also descends. The plastic plate 13 presses the transparent bottom plate 32 of the resin trough 30 and the transparent bottom plate 32 of the resin trough 30 presses the base portion 23 of the movable storage portion 20, The accommodating portion 20 descends down the movable bolt 21 under the elastic pressure of the spring 22 while pressing the spring 22 as a whole.

The transparent bottom plate 32 of the resin trough 30 and the movable storage compartment 20 are kept parallel to each other even if the movable storage compartment 20 does not maintain a certain level, The degree of compression of the spring 22 provided on the movable bolt 21 keeps the movable storage compartment 20 in parallel with the transparent bottom plate 32 of the resin tank 30 at a different compression ratio.

This case corresponds to the initial position at which the molding starts, and the resin of the thin film maintains a gap between the shaping plate 13 and the transparent bottom plate 32 of the resin tank 30. This is because the plastic plate presses the transparent bottom plate 32 of the resin tank 30 in a state in which the liquid resin 2 maintains the constant height of the resin tank 30 so that the resin of the thin film is pressed against the plastic plate 13, (30) on the transparent bottom plate (32). This film is a film about 0.1 mm or less, which corresponds to the thickness of a unit molded layer of a 3D printer for molding a three-dimensional object.

In this state, the liquid resin is solidified by exposure energy having a predetermined shape between the shaping plate 13 and the transparent bottom plate 32 by the exposure of the exposure unit 50.

After the exposure is completed, the resin of the unit molding layer is hardened, and the molding plate 30 is lifted. The initial form of the rise is shown in Fig. In the initial stage of the rise, the movable storage portion 20 is lifted up to a state where it can no longer be lifted due to the bolt head of the movable bolt 21 due to the increase of the degree of compression of the movable storage portion 20 in the compressed state The plastic plate 20 is lifted. At this time, the movable storage portion 20 is returned to its original position by the elastic force of the spring 22. [ Of course, the compression of the movable storage portion 20 proceeds in the early stage of the molding, and the degree of compression gradually decreases as the molding progresses.

At this time, a solid unit forming layer is formed between the shaping plate 13 and the transparent bottom plate 32 of the resin tank 30 and attached to both sides of the shaping plate 13 and the bottom surface 32.

FIG. 6 is a graph showing a function of showing a state in which the resin tank rises unevenly because the rise of the resin tank is restricted by the upward regulation portion and the rise of the remaining portion of the resin tank is not regulated when the molding plate according to the embodiment of the present invention rises further. to be.

The shaping plate 20 continues to rise further after the initial rise. Since a solid unit molding resin is molded between the shaping plate 13 and the transparent bottom plate 32 of the resin trough 30 and attached to both sides of the shaping plate 13 and the transparent bottom plate 32, When the plate 13 continues to rise, the resin tie 30 attached to the unit molding layer under the shaping plate 13 is also subjected to a force of upward movement.

At this time, the corner portion provided with the protruding portion 31 on the left side of the resin tank 30 is restricted from rising by the guide restricting jaw 26a of the mounting guide 26 of the movable accommodating portion 20, but the right and other corner portions There is a flow space at a certain distance from the mounting guide 26 of the movable storage compartment 20 so that it can rise to the upper part.

The guide restricting jaw 26a and the protruding portion 31 provided in the mounting guide 26 correspond to the first restricting portion 29. [ When an upward external force is applied to the resin tank by the first regulating portion 29, the resin tank 30 rises unevenly. Unequal rise means that the rise of the resin trough 30 rises unevenly in the vertical direction.

An example of a unbalanced lift is to rise with a tilting motion. At this time, the center of rotation of the tilting operation becomes the protrusion 31 on the left side.

The molding surface formed immediately before by the tilting operation is not entirely released at one time, but progresses gradually or partially. Therefore, there is an effect that the load applied to the molding surface is relatively smaller than that in the case of the entire surface release.

That is, the wider the forming surface, the wider the surface to be released and the greater the load required for the mold release. However, since the tilting operation as in the embodiment of the present invention induces partial deformation, Do.

Since the one corner of the resin trough 30 is regulated by the upward regulation portion 29, the molded article 1 having the hardened unitary molding layer attached to the lower portion of the molding plate 13 starts the left side with the projection 31 The resin tray 30 is released from the transparent bottom plate 32 of the resin trough 30 and the resin trough 30 drops to the bottom due to its own weight when the remaining corners are completely released, (23).

The guide regulating step 26a provided in the mounting guide 26 and the protruding part 31 of the resin tank 30 constitute the first regulating part 29 in the embodiment of the present invention. When the rising external force is applied to the resin trough 30, the resin trough 30 rises unequally by the first restricting portion 29. One example of a non-flattening lift is several different embodiments where tilting is rising but unevenly rising. The first regulating portion 29 describes the case in which the shaping plate 13 is lifted, but it is also applicable to the case where the shaping plate 13 descends.

The enlarged view of FIG. 6 shows an exaggerated shape of the tilting of the resin tanks. In practice, momentary tilting and retracting operations occur in short, invisible moments when the width of the resin bath is 30 centimeters, by setting the flow space to 3 to 5 millimeters. However, due to such a tilting operation, releasing is facilitated and a stable three-dimensional object can be formed.

The first embodiment of the present invention is a case where regulating protrusions 31 are provided at one corner of four corners of a resin tank, as shown in Fig. At this time, the remaining three corners can rise freely. The resin flange of the corner where the restricting projection 31 is installed is caught by the restricting jaw 26a to be regulated to rise and the rest of the corners do not have the restricting projection so that it rises while receiving a proper buffering force due to the rise of the molding plate, .

In Fig. 3 according to the second embodiment of the present invention, two regulating protrusions 31 and 31 'are provided in the flange portion of the resin tank. Of these two restricting projections, the height of the first restricting projection 31 is high. The height of the projection of the second restricting projection 31 'is low. Therefore, the resin tank on the side of the first regulating protrusion 31 is prevented from rising, and the corner of the resin tank on which the second regulating protrusion 31 'is provided is finely regulated. The other two corners rise without moderating regulation, subject to moderate buffer capacity. Therefore, the tilting of the resin tanks is performed with more complicated motion than when one regulating projection is provided.

In the preferred embodiment of the present invention, protrusions 31 are provided on at least one corner of the resin trough 30, but the present invention is not limited to this. A protrusion may be provided on the guide portion 26 on which the resin tank is mounted so that one corner of the resin tank can be regulated.

In the preferred embodiment of the present invention, one protrusion is provided at one corner portion to restrict one corner and the other three corner portions are not restricted. However, the two corner portions are regulated and the two corner portions are regulated You can also use a tilting method.

Also, a tilting method in which three corners are regulated and one corner is not regulated is also possible. It is also included in the present invention that a buffering member such as a leaf spring is provided at corners that are not regulated so as to receive an appropriate buffering force.

In one embodiment of the present invention, a quadrilateral resin trough is used, but a resin trough such as a circle or an ellipse can also be used. However, in a circular or elliptical resin tank, at least one part regulates the rise and the rest does not regulate the rise.

In the case of a circular resin tank, the height of the regulating protrusion can be gradually changed along the rim. Therefore, the extension line of the high end point of each projection can be set to have a constant slope. By adopting such a structure, more smooth release can be realized.

In the embodiment of the present invention, the regulation jaws and protrusions for raising artificially unevenly are provided. However, the regulation jaws and protrusions are not provided, but the position of the molding plate is set to be eccentric in a certain direction with respect to the center of gravity of the resin tank. And when the steering plate is elevated, it can be structured so as to rise unevenly by the self weight of the resin tank.

In the present invention, although the case of raising the shaping plate is taken as an example, instantaneous tilting of the resin tub can be achieved in the method of lowering the shaping plate, thereby achieving the same object. That is, the embodiment in the case where the shaping plate descends is also possible, and this embodiment is also included in the present invention. At this time, in order to obtain a flat forming surface of the received liquid resin, a liquid level regulating bottom plate having a transparent bottom plate inside the resin tank and regulating the height of the liquid resin may be provided. The liquid level regulating deck can be installed so that liquid level regulation can be released when the molding is finished.

Further, it has been confirmed that the tilting type resin bath of the present invention is more excellent in the resin tank of high hardness in which the elastic deformation is small.

6, the resin trough 30 is fixed to the resin tiller 30 and one corner of the connecting portion 12 and the shaping plate 13 when the shaping plate driving portion 11 is lifted up And the other corner is not regulated so that the shaping plate 13 is tilted up against the bottom of the resin tray 30 so that the shaping plate 13 and the photocurable resin can easily be released. .

The second regulating portion 29-1 according to another embodiment of the present invention includes a regulating guide portion 11-2 connected to the connecting portion regulating protrusion 12-1 and the forming plate driving portion 11 provided on the forming plate connecting portion 12, .

A connecting portion regulating projection 12-1 is provided at one side of the forming plate connecting portion 12 and an elastic plate spring 12-2 is provided at the other side. The shaping plate driving section 11 is provided with a regulation guide section 11-2 and an elastic guide section 11-1 and the elastic guide section 11-1 is provided with an elastic leaf spring 12-2.

When the shaping plate driving part 11 is moved upward, the shaping plate connecting part 12 also moves upwards. At this time, the side where the connecting part regulating protrusion 12-1 is installed is immediately moved upward, but the regulating protrusion 12-1 The elastic plate 12-2 is compressed while the other side of the elastic plate 12-2 is compressed under the elastic pressure of the elastic plate 12-2 and the elastic plate 12-2 is delayed to rise and this eventually leads to the tilting of the plate connecting portion 12, Disengaging with tilting against the plane. Therefore, in the 3D printer according to the present invention, when the shaping plate is released from the shaping surface of the resin tank, the shaping plate and the shaping surface are not entirely released at a time by releasing the shaping plate while tilting, .

The present invention can be applied to the embodiment in the case where the shaping plate descends, and this embodiment is also included in the present invention.

Meanwhile, the exposure unit 50 of the present invention can use various optical devices such as a laser system, a project system, and an LCD system.

In particular, the exposure unit of the LCD system is relatively short in the focal distance compared with other light sources, and can be installed close to or close to the molding surface. At this time, the LCD light source is integrally formed with the resin plate or the liquid level regulating transparent bottom plate, and can be lifted or unlatched unrestrained by the regulating portion and the buffer member of the present invention. As a result, the exposed part of the LCD system is relatively useful for applying a tilting type release mold such as the present invention, since the light source and the molding surface are relatively short, so that the molding of a large molded product is easy and the molding plate is wide. Therefore, an exposure unit of the LCD system is also included in the present invention.

The present invention relates to a DLP 3D printer of the present invention. Therefore, there is an industrial possibility.

Claims

In a 3D printer,

frame;

An exposure section;

A resin tank accommodating a liquid resin material and provided on the frame having a molding surface on which the liquid resin material is photo-cured by an amount of light projected from the exposure unit;

A molding plate accommodated in the resin tank to support the molding;

A shaping plate driving unit that lifts and drives the shaping plate relative to the resin tank; And

And a regulating portion regulating a part of the resin tank or a part of the molding plate so as to raise or lower the resin tank or the molding plate by unloading or uneven descending due to an upward or downward external force of the molding plate driving unit and,

Wherein the shaping plate is released while tilting when the shaping plate is released from the shaping surface by an operation of the regulating portion interlocked with the rising or falling of the shaping plate driving portion.
The method according to claim 1,

[0027]

A regulating jaw provided in the frame and regulating upward or downward movement of a rim region of the resin tank,

And a regulating protrusion provided on either one of the regulating jaw and the resin trough to cause a rise or an uneven descent of the resin tank.
The method according to claim 1,

The frame includes a frame body, a movable accommodating member which is disposed so as to be movable up and down with respect to the frame body to receive and support the resin tub, the movable accommodating member having the regulating jaw, and a movable accommodating member interposed between the movable accommodating member and the frame main body, And a spring unit for elastically lowering the movable receiving member with respect to the frame body by a predetermined lowering width when a downward external force is applied to the movable housing member.
The method of claim 3,

Wherein the movable housing member has a pair of mutually opposed mounting guide portions for guiding sliding attachment and detachment along the horizontal direction of the resin tank, and the regulation jaw is a partial area of any one of the pair of mounting guide portions 3D printers.
5. The method of claim 4,

Wherein the resin reservoir has a rectangular container shape and the regulating portion is provided in any one of the four corner regions of the resin reservoir,

And the other corner of the four corner areas is provided with an elastic spring.
The method according to claim 1,

[0027]

And a shaping plate connection part provided between the shaping plate and the shaping plate driving part to cause the shaping plate to rise or fall unevenly in association with the upward or downward movement of the shaping plate driving part.