KR20160129630A - 3D printer Head for three dimension production comprised of multi material - Google Patents

Abstract

The present invention relates to a head for a 3D printer capable of discharging different materials with one head, an FDM discharging unit for discharging a nonconductive material for forming a structure in an FDM manner, And a conductive material discharging portion for discharging a conductive material for forming circuit conductors while being installed, so that a structure of the three-dimensional circuit device and a new type of multi-material discharging device capable of effectively discharging each material for conductor wire forming in a single process The present invention provides a head for a 3D printer capable of simplifying the overall configuration of the apparatus and improving the efficiency of the process by simplifying the process as well as downsizing the equipment.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a head for a 3D printer for multi-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head for a 3D printer, and more particularly to a head for a 3D printer which forms a three-dimensional object composed of multiple materials in such a manner that a plastic material is melted and discharged, .

In general, 3D printing technology is a technology to produce three-dimensional shape by stacking materials according to designed data, and it has a feature to make shape easily and quickly compared with existing cutting processing.

This 3D printing technology has been mainly used for prototyping to confirm the function at the development stage rather than the finished product due to the materials to be used and the technical limitations.

Most 3D printing technologies use a single material for three-dimensional geometry production due to technical limitations such as molding method and material properties used.

Recently, multi-material 3D printing technology using multi-material has attracted attention as a manufacturing technology for direct production of products.

The use of multiple materials is advantageous in that a product can be manufactured through a single process without going through various processes such as assembly and welding.

Particularly, FDM (Fused Deposition Modeling) technology among 3D printing technologies is the most advanced technology for simultaneously applying multiple materials.

This FDM technique forms a three-dimensional shape by melting the thermoplastic plastic material in the form of a filament, feeding it through the nozzle, and controlling the position of the nozzle.

Thus, by applying multiple nozzles and material dispensing devices, different materials can easily be used compared to other types of 3D printing techniques.

However, the existing FDM multi-material 3D printing technology has a limitation that only polymer materials of similar characteristics can be used.

On the other hand, as well as FDM, most common 3D printing techniques classify technologies according to the materials used and the way they are processed.

Therefore, even though the current 3D printing technology is different in color, material, and property, it is possible to use only materials having the same processing characteristics that can be applied to the processing method of each 3D printing technology.

Therefore, in order to directly produce the finished product through the multi-material 3D printing technology applicable to the direct product production, it is necessary to develop a technology that can use completely different materials.

On the other hand, DW (Direct Writing) technology is a technique for forming a pattern of a desired shape by directly applying pressure to a fluid to be discharged through a nozzle, and directly controlling the position of the nozzle through a transfer system.

This technology is applied to direct printed circuit technology and is applied to the production of electronic circuits, sensors, devices and various electronic products.

The direct injection technology has a feature that the system configuration is simple in comparison with other technologies in forming a pattern, and a desired material can be directly formed at a desired position without a complicated process.

It is possible to create a new type of three-dimensional circuit by using the multi-material 3D printing technology which combines FDM technology using nonconductive material and direct injection technique using conductive material.

Conventional printed circuit boards (PCBs) are fabricated in the form of planes, and circuit elements are also arranged in planes, which limits design of the shapes.

Therefore, the existing PCB is located inside the product, which limits the design of the external shape of the product.

On the other hand, a new type of three-dimensional circuit fabricates a structure that simultaneously performs the external shape of the product and the insulator of the PCB through 3D printing technology, and arranges the circuit elements three-dimensionally inside the structure to produce an electronic product with high design freedom .

On the other hand, studies on multi-material 3D printing technology are proceeding in various forms as follows.

As an example, we have studied on the production of scaffolds using a number of materials by applying the 3D printing technology of extrusion type.

As another example, electronic circuits were fabricated using photocurable 3D printing technology and conductive material molding technology.

That is, a structure is fabricated using a SLA (Stereo Lithography Apparatus) technique among the photocuring methods, and then a circuit element is inserted on the surface.

After that, the circuit was molded in such a manner that the conductive material was discharged onto the surface of the structure by using a direct scanning technique to manufacture an electronic circuit.

As another example, 3D electronic circuits were fabricated by applying SLA technology and direct scanning technology.

SLA technology was used to construct the structure, and standardized circuit elements were inserted inside the structure manufacturing process and arranged in three dimensions.

In addition, a three - dimensional electronic circuit was fabricated by molding a conductive material directly into a structure through a scanning method.

As another example, electronic circuits were fabricated by applying FDM technology and direct scanning technology.

In particular, circuit conductors were formed on the two opposing surfaces of the rectangular parallelepiped structure and then electrically connected.

However, this study formed a conductive material on the surface of the structure after the completion of construction.

Most of studies on the fabrication of electronic circuits using the existing 3D printing technology have been performed on the surface of the fabricated 3D structures.

In addition, although a multi-material technique is applied, another molding process is used after completing one molding process.

In other words, there is little research on the fabrication of a three-dimensional circuit using a single process.

Particularly, there is an example of fabricating a three-dimensional circuit by applying SLA technology and direct injection technology. Using SLA technology, a structure can be manufactured with high precision and resolution. However, since liquid material is used, For the molding, a cleaning process is indispensable, and the entire manufacturing process is complicated.

In this way, existing researches are the method of manufacturing three-dimensional circuit devices by applying independently configured process equipments. In this case, when independently configured equipments are used, they are molded between respective process equipments for forming structures and circuit conductors There is a disadvantage that a product must be moved, and a stage system for controlling each process equipment is separately required, so that the overall device configuration becomes complicated.

Accordingly, the present invention provides a 3D head assembly for a 3D printer capable of realizing a three-dimensional circuit device manufacturing process and a multi-material complex system by a simple and automated process compared with stereolithography by applying FDM technology using a solid material .

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a three-dimensional circuit device and a conductive material discharging device, By implementing a new type of multi-material dispensing 3D printer head that can be effectively implemented in a single process, it is possible to simplify the overall device configuration by simplifying the process as well as downsizing the equipment, And to provide a head for a 3D printer which can improve the performance of the head.

In order to achieve the above object, a 3D printer head for multi-material molding according to the present invention has the following features.

A head for a 3D printer capable of discharging different materials with a single head, comprising: an FDM discharging unit for discharging a nonconductive material for forming a structure in one of a head frame and an FDM system; And a conductive material discharging portion for discharging a conductive material for circuit conductor forming. Therefore, the 3D printer head is characterized in that it can effectively manufacture a three-dimensional circuit device by discharging multiple materials through a single integrated head.

In this case, the conductive material discharging portion discharges the conductive material by a direct scanning method.

Here, the conductive material discharging portion includes a syringe fixed to the head frame while storing a material, a driving portion provided on the head frame to provide power for a material discharging operation, and a driving portion that is screw- And a direct scanning nozzle which is mounted on an end portion of the syringe and in which the material is finally discharged. The direct scanning head includes a syringe holder for pressing a handle of a syringe while operating.

At this time, the syringe holder is pierced through a guide bar vertically installed on the head frame, so that accurate guidance can be obtained without shaking during vertical movement.

The driving unit includes a step motor as a power source, an LM screw vertically installed on the head frame and coupled to the syringe holder of the scanning head unit by screws, and a motor motor connected between the step motor side and the LM screw side, And a belt transmission for transmitting to the screw.

The belt transmission includes a first pulley mounted on a shaft of a step motor, a second pulley mounted on an upper end of the LM screw, and a large pulley connected by the first pulley and the first belt, And a dual pulley connected to the second pulley by a second belt and having a small pulley.

In such a belt transmission apparatus, it is preferable that the first pulley has a smaller diameter than the pulley, and the second pulley has a larger diameter than the pulley, so that the torque can be increased.

The head for a 3D printer provided in the present invention has the following advantages.

By integrating the conductive material supply and the non-conductive material supply into one head, it is possible to perform the process while discharging the material for forming the structure and the material for forming the circuit conductor in a single process according to the process plan, It is possible to realize the miniaturization of the device, and in particular, the efficiency of the entire process for manufacturing the 3D circuit device can be improved.

1 is a front view showing a head for a 3D printer for multi-material molding according to an embodiment of the present invention;
2 is a plan view showing a belt transmission in a head for a 3D printer for multi-material molding according to an embodiment of the present invention;
FIGS. 3A and 3B are front views showing an operating state of a head for a 3D printer for multi-material molding according to an embodiment of the present invention;
4 is a schematic view showing a process of fabricating a three-dimensional circuit device using a head for a 3D printer for multi-material molding according to an embodiment of the present invention
5 is a conceptual diagram of a multi-material composite system applying a head for a 3D printer for multi-material molding according to an embodiment of the present invention
6 is a graph showing a result of measuring a change in a scanning flow rate according to a rotation speed of a step motor in a multi-material composite system using a 3D printer head for multi-material molding according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view showing a head for a 3D printer for multi-material molding according to an embodiment of the present invention.

As shown in Fig. 1, the head for the 3D printer has an FDM discharge unit for discharging a non-conductive material and a conductive material discharge unit for discharging a conductive material into one head, So that the three-dimensional circuit device can be manufactured effectively in a single process.

To this end, the 3D printer head includes a head frame 10 installed in an X-Y stage (not shown) of 3D printer equipment.

The head frame 10 is in the form of a rectangular plate and has an FDM discharge portion including an FDM head portion 11 and an FDM nozzle 12 to be described later and a direct scanning head portion 13 and a direct scanning nozzle 14 The conductive material discharge portion is provided.

For example, the FDM head 11 and the FDM nozzle 12 are installed on one side of the head frame 10, that is, on the left side, and the FDM nozzles 12 are provided on the right and left sides of the head frame 10, (14).

The head frame 10 is movable in the X-axis direction and the Y-axis direction in accordance with the movement of the XY stage. As a result, the FDM head portion 11 and the direct scanning head portion 13 are moved So that the respective materials can be discharged.

In addition, the 3D printer head includes an FDM head 11 and an FDM nozzle 12 for discharging a non-conductive material for forming a structure in an FDM manner.

The FDM head 11 and the FDM nozzle 12 are installed on the upper surface and the lower surface of one side (left side) of the head frame 10 respectively and are operated by a plunger (not shown) moving up and down by a motor The FDM nozzle 11 and the FDM nozzle 12 are the same as those in the conventional art. Therefore, the FDM nozzle 12 may be a specific A description thereof will be omitted.

Of course, although not shown, a tube or the like for supplying the molten material can be connected to the FDM nozzle side.

In addition, the head for the 3D printer includes a direct scanning head portion 13 and a direct scanning nozzle 14 for discharging a conductive material for circuit lead forming in a direct scanning manner.

The direct scanning head 13 and the direct scanning nozzle 14 are provided on the upper surface and the lower surface of the other side (right side) of the head frame 10, respectively.

The direct scanning head unit 15 is provided with a syringe housing 27 which is installed on the upper surface of the head frame 10 and has an open upper part. A syringe 16 filled with a conductive material is mounted and fixed .

At this time, the lower discharge hole of the syringe 16 can be connected to the side of the direct scanning nozzle 14 while inserting the syringe 16 in the syringe housing 27, whereby the liquid material in the syringe It is supplied to the direct scanning nozzle 14 so that discharge can be performed through the nozzle.

In particular, the direct scan head 15 is provided with a syringe holder 17 as a means for pressing the handle of the syringe 16.

The syringe holder 17 includes a holder body 17a having a plate shape and a cylindrical holder pressing part 18a vertically formed on the upper surface of the holder body 17a to receive a length of the syringe including the syringe handle part therein 17b.

At this time, the cylindrical holder pressing portion 17b is not shown in the drawing, but its side portion is opened so that it can be mounted on the syringe housing 27 after inserting the syringe 16 through the cylindrical pressing portion 17b.

The handle of the syringe 16 inserted into the syringe housing 27 through the holder pressing portion 17b is inserted into the holder pressing portion 17b to be in contact with the inner surface of the upper end of the holder pressing portion 17b, 17b are moved downward, the syringe handle is pushed so that the material in the syringe 16 can be supplied to the nozzle side.

One end of the syringe holder 17, that is, one end of the holder body 17a is screwed while being passed through an LM screw 20 to be described later. Thus, when the LM screw 20 rotates, The entire syringe holder 17 can be moved up and down. As a result, when the syringe handle is pressed down during the downward movement, the material in the syringe can be escaped.

The syringe holder 17 is guided by the guide bar 18 for accurate movement without vertical movement during the vertical movement.

The guide bar 18 is installed vertically on the upper end of the head frame 10 and the guide bar 18 installed in this manner is inserted into the end of the syringe holder 17 through a bushing As shown in Fig.

Accordingly, the syringe holder 17 can be moved in a precise linear trajectory while being guided by the guide bar 18 when the syringe holder 17 is moved up and down.

In addition, the 3D printer head includes a driving unit 15 of a screw driving type for providing power for discharging operation of the direct scanning head unit 13.

The driving unit 15 is positioned between one side of the head frame 10, for example, between the FDM head unit 11 and the direct scanning head unit 13, and includes a step motor 19, an LM screw 20, Device 21 and the like.

The step motor 19 is installed in a vertical posture with an axis up while being supported at a lower end by a bracket (not shown) provided on the head frame 10. A shaft of the step motor 19 installed on the shaft motor 19 is connected to a belt- Of the first pulley 22 is mounted.

The LM screw 20 is vertically positioned in front of the step motor 19 and the lower end portion is supported by the head frame 10 via a bearing or the like. (Not shown) in the screw support block 28 attached to the body of the motor 19, and the upper end of the LM screw 20, which is installed as described above, (23) is mounted.

At this time, the LM screw 20 vertically penetrates one end of the syringe holder 17 and is coupled to the syringe holder 17 side in a structure capable of transmitting a screw electric power, for example, a ball screw.

Accordingly, when the LM screw 20 rotates, the entire screw holder 17 can be moved up and down by screw driving at this time.

The belt transmission 21 is connected between the step motor 19 and the LM screw 20 to transmit the motor power to the screw.

For this purpose, the belt transmission apparatus 21 can increase the rotational torque of the motor while transmitting power using three pulleys and two belts, for example, a timing belt combination.

2, a first pulley 22 is mounted on a shaft of the step motor 19, a second pulley 23 is mounted on an upper end of the LM screw 20, A dual pulley 25 composed of a combination of a lower pulley 25a and an upper pulley 25b is provided.

The large pulley 25a and the first pulley 22 of the dual pulley 25 are connected by the first belt 24 and the small pulley 25b and the second pulley 23b of the dual pulley 25, Are connected by a second belt 26. [

The power of the stepping motor 29 is transmitted through the first pulley 22, the large pulley 25a, the small pulley 25b, and the second pulley 23 in the form of deceleration to the LM screw 20 .

For example, the first pulley 22 of the belt transmission apparatus 21 has a relatively small diameter as compared with the large pulley 25a, and the second pulley 23 is relatively small as compared with the small pulley 25b So that the rotation torque of the motor can be increased while the motor power is transmitted in a decelerated fashion.

Here, the dual pulley pulleys and the small pulleys mean a pulley having a diameter difference relative to each other. In the case of a dual pulley, a bracket (not shown) for supporting the step motor can be suitably installed.

Of course, the large pulley 25a of the dual pulley 25 and the first pulley 22 of the step motor 19 can be positioned at the same height, and the small pulley 25b and the small pulley 25b of the dual pulley 25, The second pulley 23 of the LM shaft 20 can be positioned at the same height.

Figs. 3A and 3B are front views showing an operating state of a head for a 3D printer for multi-material molding according to an embodiment of the present invention. Fig.

As shown in Figs. 3A and 3B, here, an operating state of discharging the conductive material by a direct scanning method using the direct scanning head 13 and the direct scanning nozzle 14 is shown.

For example, when the step motor 19 is operated, the power is transmitted from the first pulley 22 to the large pulley 25a, the small pulley 25b, and the second pulley 23 while the LM screw 20 At the same time, the syringe holder 17, which is coupled to the LM screw 20 in a screw-transferable structure, moves downward.

When the syringe holder 17 is lowered, the holder pressing portion 17b directly presses the handle of the syringe 16 mounted on the scanning head portion 13, So that the material can be discharged through the direct scanning nozzle 14.

4 is a schematic view showing a process of fabricating a three-dimensional circuit device using a head for a 3D printer for multi-material molding according to an embodiment of the present invention.

As shown in FIG. 4, here, a process of forming a three-dimensional circuit device by simultaneously molding a plurality of materials (non-conductive material and conductive material) in a single process through FDM technology and direct scanning technology is shown.

That is, the FDM method is used to form a structure by repeatedly laminating a nonconductive material to form a structure, a circuit conductor is formed of a conductive material by using a direct scanning method, and a circuit element is mounted and electrically connected thereto. Dimensional circuit in a simple process.

For this purpose, a plastic material such as a nonconductive solid material such as an ABS series is melted, and the solid material thus melted is extruded through an FDM nozzle to form a plate-like structure 100 having a thin section.

The plate-like structure 100 may be at least one layer, and it is preferable to form a plurality of layers for securing the insertion depth of the circuit element 110.

A groove 130 is formed for inserting the circuit element 110 and forming the circuit conductor 120 when the structure 100 is formed.

That is, in forming the structure 100 by laminating the nonconductive materials through the FDM method, the grooves 130 for inserting the circuit elements 110 and for forming the circuit conductors 120 are formed in the structure layer, So that a circuit can be manufactured.

In addition, it is possible to provide a structure for electrically connecting each layer of the upper and lower structures 100 when the structure 100 is formed, that is, between the circuit elements inserted into and formed in the respective structures 100, Thereby forming a vertical hole 140 for electrical connection between the device and the circuit conductor.

Then, the circuit conductor 120 is formed by a direct scanning method using a direct scanning head and a direct scanning nozzle, and the circuit element 110 is mounted.

That is, conductive material is discharged into the grooves 130 and the holes 140 of the structure 100 through the direct scanning nozzle to form the circuit conductors 120, and the circuit elements 110 So that the circuit element 110 and the circuit conductor 120 can be electrically connected to each other.

Subsequently, after the formation of the structure using the FDM nozzle and the direct scanning nozzle, the inserting of the circuit element and the formation of the circuit conductor are completed, on the structure 100 having the circuit conductor 120 and the circuit element 110, (100) are laminated and the above process is repeated, a complex type three-dimensional circuit device can be effectively manufactured through a very simple process.

[Example]

It is possible to constitute a multi-material composite apparatus by integrally configuring the FDM type material feeding device and the direct scanning type material feeding device by one head and controlling it by a stage system.

6 is a conceptual diagram of a multi-material composite system.

In order to develop a complex device, an open source commercial equipment BFB3000 was used and a direct injection device was separately manufactured and installed in the head of the composite device.

The flow measurement experiment was conducted to verify the performance of the direct injection system.

On the other hand, the direct injection technique is divided into a pneumatic method using a pneumatically controlled pump and a mechanical method using a syringe pump controlled by a mechanical drive.

The pneumatic method is a method of discharging a liquid by transferring pressure to a liquid in a container having a constant volume using the pressure of generated air.

The mechanical system is a system in which liquid is discharged by pushing the piston of the syringe by conveying the pressing portion through the rotation of the motor.

The mechanical direct injection technology has a simpler and more economical structure than the pneumatic system.

However, there is a disadvantage that the reaction of the fluid due to pressurization and decompression is not precise as compared with the pneumatic system.

The direct injection system manufactured in this study was applied by mechanical method.

Therefore, when a general nozzle is applied to a direct injection system for a complex system, problems such as droplet formation, flow, and nozzle clogging have occurred.

To solve these problems, an openable nozzle was developed and applied. The shape of the nozzle tip contacting the base plate and the effect of the spring constant on the base plate were studied.

The BFB 3000, an open source based commercial device, was modified for the development of complex devices.

BFB 3000 is based on FDM technology and it is possible to use plastic material of PLA and ABS series. In this study, ABS material is used.

The diameter of the heating nozzle for extruding the material is 0.5 mm. The structure can be fabricated with 0.125, 0.25 and 0.5 mm lamination thicknesses and the output error range is ± 0.2 mm.

It is possible to mold a structure up to 100.100.200 mm in size.

The x, y, and z stages and control systems of the BFB 3000 were used for the fabrication of complex devices.

The x, y axis stage is driven by a pulley and belt rotating by a stepping motor, and the z axis stage is driven by a ball screw.

The stage system operates with G code information created through AXON.

The G-code for driving the device contains both structural and conductive material molding information.

That is, it includes position coordinates, feed speed and machining path information for driving the stage, and includes nozzle temperature for driving the material supply device, material supply step motor control information, and the like.

We have developed a head that incorporates an FDM material feeder and a direct scan type conductive material feeder.

The FDM type material feeding device extrudes the melted plastic material through the heating nozzle to supply the material.

The supply amount of the material is controlled by the number of revolutions of the step motor.

On the other hand, a mechanical scanning type material feeding apparatus was applied.

Two types of material feeding devices were integrated into one head.

Figure 1 shows a head integrated with FDM and direct scan type material supply devices.

During the production of the structure, the material is supplied through the FDM device at the same time as the stage is driven, and the material is supplied through the direct injection device when forming the conductive material.

This enables the molding of automated structures and circuit conductors.

The operation principle of the direct injection material supply device is shown in Figures 3A and 3B.

FIG. 3A shows the pressure portion at the highest position, and FIG. 3B shows the pressure portion at the lowest position.

The LM screw rotates by the rotation of the step motor, and the pressing part of the direct scanning device performs linear motion.

A syringe filled with a conductive material is placed directly inside the injection device, and is pressed by the pressing portion to discharge the conductive material through the nozzle.

The rotation of the LM screw connected to the stepper motor was decelerated through the pulley and the timing belt for precise control of the injection flow rate and increase of the rotational torque.

A power transmission device composed of a pulley and a timing belt is shown in Fig.

The stepper motor shaft and the pulley shaft were connected by a timing belt with 16 teeth and 72 pulleys, respectively, and the shaft rotation was decelerated at a rotation ratio of 4.5.

The pulley shaft is again equipped with 16 pulleys, and the LM thread is fitted with 72 pulleys of teeth and connected by a timing belt.

The rotating shaft was decelerated again at a rotation ratio of 4.5.

Thus, the LM screw was decelerated with a rotation ratio of 20.25 for the stepper motor.

The integrated head of the fabricated multi - material composite system is attached to the X - axis stage, and the X - axis stage is attached to the Y - axis stage.

Thus, the integrated head is transported in the X, Y plane.

The Z-axis stage is provided with a shaping plate, and the thickness of the structure is controlled by controlling the position of the shaping plate.

The developed direct injection system applied mechanical system for discharging liquid material.

In particular, in direct injection technology based on liquid flow, it is important to constantly control the desired flow rate for constant control of line width and desired line width in forming conductive material.

Therefore, we tried to grasp the fluid discharge condition through flow measurement experiment using direct injection device.

The injection flow rate of the liquid discharged through the nozzle can be obtained as shown in equation (1).

D is 20 mm inside diameter of the syringe mounted on the direct injection device.

l is 2 mm with lead of L M screw.

S is the rotation ratio of the step motor and the LM screw is 20.25.

R is the rotational speed of the stepping motor, and the scanning flow rate according to the rotational speed of the stepping motor is obtained.

flow rate =? / 4 * D * R / s * 1 ----- (1)

The experiment was carried out by increasing the step motor rotation speed by 4 RPM to 12 RPM.

The mass of the distilled water discharged for 1 hour through a nozzle (TPND-25G, Musashi) having a diameter of 250 μm was measured with respect to each step motor rotation speed, and the injection flow rate was obtained through this measurement.

The results of measuring the change in the scanning flow rate with the step motor rotation speed are shown in FIG.

It can be seen that there is almost no difference between the predicted flow rate calculated through equation (1) and the measured flow rate measured through the experiment.

Therefore, it is judged that the developed direct scanning device operates at the performance expected by the design.

In addition, it can be confirmed that the scanning flow rate increases proportionally as the rotation speed increases.

Particularly, it can be seen that the change of the flow rate linearly changes with the rotation speed.

Therefore, it is judged that the control of the direct scanning system is possible.

As described above, according to the present invention, by integrating the FDM-type nonconductive material supplying means and the direct-scanning conductive material supplying means into one head and improving the material supplying structure in the direct scanning method, In the case of constructing the structure, the material is supplied through the FDM method at the same time as the stage is driven. In the case of forming the conductive material, the material can be supplied through the direct scanning method, and the effect of forming the automated structure and the circuit diagram can be expected.

10: Head frame
11: FDM head part
12: FDM nozzle
13: Direct scanning head part
14: Direct injection nozzle
15:
16: Syringe
17: Syringe holder
17a: holder body portion
17b: Holder pressing portion
18: Guide Bar
19: Step motor
20: LM screw
21: Belt transmission
22: First pulley
23: 2nd pulley
24: first belt
25: Dual pulley
25a: Large pulley
25b: Small pulley
26: Second belt
27: Syringe housing
28: Screw support block

Claims (7)

A head for a 3D printer capable of ejecting different materials with one head,
An FDM discharging unit installed on one side of the head frame for discharging a nonconductive material for forming a structure in an FDM manner; And
And a conductive material discharging portion provided on the other side of the head frame for discharging a conductive material for circuit conductor forming:
≪ RTI ID = 0.0 > 3, < / RTI >
The method according to claim 1,
Wherein the conductive material discharging portion discharges the conductive material by a direct scanning method.
The method of claim 2,
The conductive material discharging part includes a syringe fixed to the head frame while storing a material, a driving part provided on the head frame for providing power for material discharging operation, and a driving part connected to the driving part side in a screw- The direct scan head including a syringe holder for pressing a handle of a syringe; And
And a direct scanning nozzle mounted on an end of the syringe to which the material is ultimately ejected.
The method according to claim 3 or 4,
Wherein the syringe holder of the direct scanning head unit is supported by a guide bar vertically installed on the head frame so as to be guided during vertical movement.
The method of claim 3,
The driving unit includes a step motor as a power source, an LM screw vertically installed on the head frame and coupled to the syringe holder of the scan head unit directly by a screw, and a motor connected between the step motor side and the LM screw side, Wherein the belt drive comprises a belt conveying device for conveying the multi-material.
The method of claim 5,
The belt transmission includes a first pulley mounted on a shaft of a step motor, a second pulley mounted on an upper end of the LM screw, and a large pulley connected by the first pulley and the first belt, And a dual pulley connected by a second belt and having a small pulley.
The method of claim 6,
Wherein the diameter of the second pulley is relatively smaller than that of the first pulley pulley of the belt transmission, and the diameter of the second pulley is relatively larger than that of the small pulley.

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