WO2021251544A1

WO2021251544A1 - Plate-cutting circular saw device

Info

Publication number: WO2021251544A1
Application number: PCT/KR2020/008970
Authority: WO
Inventors: 박성현
Original assignee: 주식회사 준엔지니어링
Priority date: 2020-06-10
Filing date: 2020-07-09
Publication date: 2021-12-16
Also published as: WO2021251544A8; KR20200091830A; KR102382622B1

Abstract

Disclosed is a novel plate-cutting circular saw device, which can adjust, to be within an angle range of 45° laterally from an erect state perpendicular with respect to the upper surface of a mounting plate, the inclination of an electric circular saw for cutting a plate and the like placed on the upper surface of a worktable, can finely adjust the front-back position of the circular saw to enable the plate to be more accurately cut, and has a blade provided on a motor shaft for transmitting the driving force of a motor to the circular saw, so as to allow external air to flow into a saw housing from the rear side of a motor cover during driving of the motor, and then to be discharged together with sawdust to the outside of the lower portion of the saw housing, so that a pleasant work environment can be created. The present invention relates to a plate-cutting circular saw device comprising: the mounting plate having a through-hole formed in the upper surface thereof in the direction coinciding with the plate-cutting direction; the saw housing which is rotatably hinge-coupled to the bottom portion of the left and right sides of the mounting plate while being disposed below the mounting plate to be vertically downward from the through-hole, and which has an open upper portion; a side plate erectly provided to be spaced a predetermined distance from the side surface portion of the housing below one side surface of the mounting plate; an electric motor provided in the horizontal direction outside the saw housing, and driven according to the application of an electric current; an operation switch which is provided on one side of the side plate, and which controls the driving of the electric motor during plate-cutting work while electrically connected to the electric motor and an external power source; the circular saw which has an upper portion protruding upward and outward from the through-hole in the mounting plate in a state in which the circular saw is disposed inside the saw housing to be vertically downward from the through-hole, and which has a center portion to which the motor shaft of the electric motor is fixedly coupled, so as to cut a plate placed on the mounting plate while rotating in place according to the driving direction of the electric motor; a circular saw lifting member provided between the electric motor, the mounting plate and the side plate so as to move the electric motor and the circular saw up/down in accordance with the thickness of the plate; an angle-adjusting member provided on the saw housing and the side plates so as to adjust the inclination of the circular saw in accordance with the plate-cutting angle within an angle range of 45° laterally from a vertically erected state; and a safety cover for preventing an operator from being injured by the circular saw that rotates while being lifted upward due to the thickness of the plate during cutting of the plate, in a state in which the cover is provided above the upper portion of the circular saw protruding upward from the through-hole in the mounting plate, and further includes: a circular saw position-adjusting member provided below one side of the front surface of the mounting plate so as to finely adjust the position of the saw housing, in which the circular saw is accommodated, in the front-rear direction by means of an operation for rotating same in place in the forward and reverse directions; and a sawdust discharge member, which is provided at the motor shaft of the electric motor and the outside of the front surface of the saw housing so as to allow external air to flow into the saw housing from the rear side of the motor cover according to the driving of the electric motor during the plate-cutting work, and then to be discharged together with sawdust to the outside of the lower portion of the saw housing.

Description

Circular saw device for cutting board

The present invention relates to a circular saw device for cutting boards, and more particularly, the inclination of an electric circular saw for cutting boards placed on the upper surface of a workbench is 45 from a vertically standing state with respect to the upper surface of the mounting plate. It can be adjusted within the angle range, but the front and rear positions of the circular saw can be finely adjusted so that the plate can be cut more accurately, and a blade is installed on the motor shaft that transmits the driving force of the motor to the circular saw. Circular saw for cutting boards to create a comfortable working environment by allowing outside air to flow into the saw housing from the back of the motor cover when the motor is driven and then to discharge it together with sawdust to the outside of the lower part of the top housing. It's about the device.

In general, in order to more easily cut a plate material such as wood, acrylic, or a soft iron plate, a plate cutting device using various electric circular saws is mainly used.

The plate cutting device using the above-described electric circular saw is installed with an electric circular saw protruding from the upper surface of the workbench, and when the circular saw is rotated in place, the plate to be cut is pushed toward the circular saw and rotated at high speed on the circular saw blade. It is configured so that the plate material is cut.

However, in the plate cutting device using such a conventional electric circular saw, since the circular saw is installed at a predetermined height on the workbench, it is easy to cut a relatively thin plate, but cut a thick wooden or synthetic resin pipe, etc. The problem is that it is difficult to do.

In addition, there is a problem that precise cutting of the plate is impossible because the front-rear position of the circular saw cannot be adjusted in the existing plate cutting device, and sawdust or dust generated when the plate is cut by the circular saw is scattered around. Therefore, there is a problem that the working environment is not very pleasant and the health of workers is threatened.

Accordingly, a separate dust collector for collecting sawdust and dust generated during the cutting operation of the plate is installed.

On the other hand, as a technology related to the above-described circular saw for cutting plate material, Korean Patent Laid-Open Publication No. 10-2005-0087091 (title: plate cutting device, hereinafter referred to as 'prior art') has been proposed.

The prior art is 'a working plate in which a through hole is formed on the upper surface and Y-axis guide grooves are formed on both sides of the through hole, and a workbench in which the first supporting member and the second supporting member are installed on the bottom surface of the working plate, respectively, are provided. The Y-axis guide groove of the plate is provided with a polygonal guide for guiding the plate at multiple angles, and the X-axis side of the working plate is configured to install a right-angled guide for guiding the plate in a direction perpendicular to the X-axis. A rotary saw control unit is installed on the bottom surface to adjust the height of the rotary saw rotated by the driving member to protrude and protrude above the working plate by the height adjusting member, and cooling water is supplied to the rotary saw between the first support member and the second support member Its technical gist is that the cooling water supply unit is configured to be installed.

However, in this prior art, although a configuration capable of adjusting the height of the rotary saw is provided, the configuration is relatively complicated and inconvenient to operate.

In addition, in the prior art, there is no configuration for adjusting the front-rear position of the rotary saw, so workability is very poor, as well as a separate configuration for discharging sawdust or dust generated during the cutting operation of the plate material is not provided. Existing problems are still unresolved.

The present invention is to solve such a problem in the prior art, the purpose of which is to change the inclination of the electric circular saw for cutting the plate placed on the upper surface of the work bench from the state perpendicular to the upper surface of the mounting plate to the side 45 It is to provide a new circular saw device for cutting boards that can be adjusted within the angle range, but can cut the board more accurately by allowing the front and rear positions of the circular saw to be finely adjusted.

Another object of the present invention is to install a blade on the motor shaft that transmits the driving force of the motor to the circular saw so that external air is introduced into the saw housing from the back of the motor cover when the motor is driven, and then the saw together with the sawdust. An object of the present invention is to provide a new circular saw device for cutting boards so that a comfortable working environment can be created by discharging to the outside of the lower part of the housing.

In order to achieve the above object, the present invention is a mounting plate in which a through hole is formed in a direction coincident with the cutting direction of the plate material on the upper surface; a top housing (Saw Housing) which is hinged rotatably to the left and right bottom surfaces of the mounting plate in a state disposed under the mounting plate corresponding to the vertical downward direction of the through hole and has an open upper part; a side plate installed in a state of being spaced apart from a side part of the housing by a predetermined distance from a lower part of one side of the mounting plate; an electric motor installed in the horizontal direction from the outside of the top housing and driven according to the application of current; an operation switch installed on one side of the side plate and configured to control the driving of the electric motor when the plate is cut while being electrically connected to the electric motor and an external power supply; In a state disposed inside the top housing corresponding to the vertical downward direction of the through hole, the upper part is installed to protrude outward of the upper part of the through hole on the mounting plate, and the motor shaft of the electric motor is fixedly coupled to the central part of the electric motor A circular saw for cutting the plate placed on the mounting plate while rotating in place according to the driving direction of the; a circular saw elevating member installed between the electric motor and the mounting plate and the side plate to vertically elevate the electric motor and the circular saw according to the thickness of the plate; an angle adjusting member installed on the top housing and the side plate to adjust the inclination of the circular saw within an angle range of 45° laterally from a vertically standing state according to the cutting angle of the plate; A safety cover is included to prevent injury to the operator by the circular saw that rotates while being lifted upward by the thickness of the plate when cutting the plate while installed on the upper part of the circular saw protruding to the upper part of the through hole on the mounting plate. In the circular saw device for cutting plate material, the circular saw position is installed at the lower end of one side of the front side of the mounting plate so that the position of the top housing in which the circular saw is accommodated is finely adjusted in the front and rear direction by the operation of rotating in the forward and reverse directions in place a control member; It is installed on the outside of the front surface of the motor shaft and the top housing of the electric motor to allow outside air to flow into the top housing from the back side of the motor cover according to the driving of the electric motor during cutting of the plate material. It is configured to further include a sawdust discharge member to be discharged to.

In the present invention, the circular saw positioning member includes: a first bracket extending downward from the lower end of the front side of the mounting plate and having a screw hole formed thereon; a second bracket bent to face the first bracket on the outer side of the side of the top housing corresponding to a position spaced apart from the first bracket by a predetermined distance, the second bracket having a fixing hole formed thereon; In a state in which the tip is screwed into the screw hole on the first bracket, the tip is inserted and coupled to the process on the second bracket, and the front-rear position of the top housing with the circular saw is finely adjusted by rotating it in the forward and reverse directions in place. It is configured to include a position adjustment bolt to be adjusted.

In the present invention, the sawdust discharge member is covered with the outside of the electric motor, and a motor cover having a plurality of air inlet holes formed on the rear surface; A blade that is fixedly fitted to the middle of the motor shaft of the electric motor and rotates together when the circular saw is rotated according to the application of current in a coupled state so that external air is introduced into the top housing through the air inlet hole on the motor cover. Wow; It is fixedly installed on the outside of the mounting hole formed on the front surface of the top housing corresponding to the installation position of the electric motor, and the blade rotates without interference while the blade is positioned on the front side, and at the same time, a part of the air introduced during the rotation of the blade is discharged to the outside. A blade rotation space in the form of which the four edges are opened is formed, and a motor shaft insertion hole is formed in the central portion of the front corresponding to the blade rotation space, while the front surface corresponding to the upper side of the motor shaft insertion hole rotates the blade a blade mounting block in which a through hole is formed so that a portion of the external air introduced into the blade rotation space is discharged to the outside; It is inserted into the lower end of the blade mounting block and coupled with a screw, and blocks the lower part of the mounting hole formed in the front of the top housing so that air introduced from the outside is formed on the front of the top housing during the cutting operation of the plate according to the rotational operation of the circular saw. a guide cap guiding it to be introduced into the top housing through the mounting hole; It is formed to protrude from the lower end of one side of the top housing to the outside while communicating with the inside of the top housing, and it has a feature consisting of a discharge pipe that allows sawdust and dust generated during plate cutting work to be discharged together with the air introduced from the outside. .

According to the present invention, since the front-rear position of the electric circular saw for cutting the plate material placed on the upper surface of the workbench is finely adjusted by the action of the circular saw position adjusting member, the plate material can be cut more accurately and workability is improved. There is a significant improvement effect.

In addition, a blade is installed on the motor shaft that transmits the driving force of the electric motor to the circular saw via a blade mounting block, and an air inlet hole is formed on the rear surface of the motor cover, and air introduced through the air inlet hole when the electric motor is driven After being introduced into the top housing by the guiding action of the guide cap, it is configured to be discharged to the outside through the discharge pipe formed on the outside of the lower part of the top housing together with sawdust and dust. There is a remarkable effect that the environment is maintained.

1 is an exploded perspective view showing a circular saw device for cutting a plate according to the present invention.

Figure 2 is a perspective view showing a state in which the circular saw device for cutting the plate according to the present invention is mounted on the plate cutter.

Figure 3 is a left side perspective view of a circular saw device for cutting a plate according to the present invention.

Figure 4 is a right side perspective view of the circular saw device for cutting a plate according to the present invention.

5 is an exploded perspective view of the top housing in the circular saw device for cutting plate material according to the present invention.

6 is a side view showing a state in which the circular saw is finely adjusted in the front-rear direction in the circular saw device for cutting boards according to the present invention.

7 is a side view and a partially enlarged view showing a state in which the circular saw is finely adjusted in the front-rear direction in the circular saw device for cutting boards according to the present invention.

8 is an operation state diagram and a partially enlarged view of the circular saw position adjusting member in the circular saw device for cutting boards according to the present invention.

9 is a plan view showing a state in which the circular saw is finely adjusted in the front-rear direction in the circular saw device for cutting boards according to the present invention.

10 is a front view of a circular saw device for cutting a plate according to the present invention.

11 is an exploded perspective view showing the sawdust discharging member in the circular saw device for cutting plate material according to the present invention.

12 is a front view showing a partial cross-section of a sawdust discharging member applied to a circular saw device for cutting plate material according to the present invention.

13 is a partially enlarged view showing the action of the sawdust discharge member applied to the circular saw device for cutting plate material according to the present invention.

14 is a partial enlarged view showing a state in which the blade is excluded from the sawdust discharge member applied to the circular saw device for cutting plate material according to the present invention.

15 is a cross-sectional view showing the operating state of the sawdust discharging member applied to the circular saw device for cutting plate material according to the present invention.

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

1 to 15, in the circular saw device 10 for cutting plate material according to the present invention, a mounting plate 20 having a predetermined size is provided, and the upper surface of the mounting plate 20 has a plate material. It is configured such that the through hole 21 is formed in a direction coincident with the cutting direction.

In the present invention, a top housing 30 with an open upper portion is disposed on the lower portion of the mounting plate 20 corresponding to the vertical downward direction of the through hole 21 in the present invention so as to be rotatable on the left and right bottom surfaces of the mounting plate 20 It is hinged, and

separate side plates

40 and 40 ′ are installed on the lower side of both sides of the mounting plate 20 while standing and spaced apart from the side part of the top housing 30 by a predetermined distance.

In the present invention, an electric motor (M) driven according to the application of current is installed from the outside of the top housing (30) in a horizontal direction, and the electric motor (M) and an external power supply are located on one side of the side plate (40). and an operation switch (S) for controlling the driving of the electric motor (M) during the cutting operation of the plate in a state electrically connected to is configured to be installed.

In addition, a circular saw 50 for cutting a plate is disposed inside the top housing 30 corresponding to the vertical downward direction of the through hole 21 , and the upper part of the circular saw 50 is on the mounting plate 20 . It is installed to protrude outward from the upper part of the through hole 21, and the motor shaft 51 of the electric motor M is fixedly coupled to the center of the circular saw 50, and the motor shaft 51 is fixed in place according to the driving direction of the electric motor M configured to rotate.

In the present invention, between the electric motor (M), the mounting plate 20 and the side plate 40, a circular saw elevating member ( 60) is installed, and on the top housing 30 and the side plate 40, the angle to adjust the inclination of the circular saw 50 within an angle range of 45° laterally from a vertically standing state according to the cutting angle of the plate The adjusting member 70 is configured to be installed.

In addition, in the upper upper part of the circular saw 50 protruding to the upper part of the through hole 21 on the mounting plate 20, the circular saw 50 rotates while being lifted upward by the thickness of the plate material during cutting of the plate material. The safety cover member 80 to prevent the operator from being injured by the is configured to be installed.

On the other hand, in the present invention, at the lower end of the front side of the mounting plate 20, the position of the top housing 30 in which the circular saw 50 is accommodated is finely adjusted in the front and rear directions by rotating in the forward and reverse directions in place. The top position adjusting member 90 is installed.

In addition, on the outside of the front surface of the motor shaft 51 and the top housing 30 of the electric motor (M), the top housing 30 ) The sawdust discharge member 100 is configured to be installed so that outside air is introduced into the inside and then discharged to the lower outside of the top housing 30 together with sawdust.

In order to configure the circular saw position adjusting member 90 in the present invention, a first bracket 91 having a screw hole 91a formed thereon is formed to extend downward from the lower end of one front side of the mounting plate 20. and a second bracket 92 having a fixing hole 92a on the surface on the outside of the side of the top housing 30 corresponding to a position spaced apart from the first bracket 91 by a predetermined distance from the first bracket 91 and are bent oppositely.

In addition, a separate positioning bolt 93 is screwed into the screw hole 91a on the first bracket 91 to rotate in the forward and reverse direction, and the front end of the positioning bolt 93 is the second It is configured to be fitted and fixed in the fixing hole 92a on the bracket 92 .

In order to configure the sawdust discharging member 100 in the present invention, a motor cover 52 having a plurality of air inlet holes 52a formed on the rear surface is covered and coupled to the outside of the electric motor M, and the electric motor ( In the middle part of the motor shaft 51 of M), external air is rotated together during the rotation operation of the circular saw 50 according to the application of electric current through the air inlet hole 52a on the motor cover 52, the top housing 30 ), the blade 101 to be introduced into the interior is fixedly fitted and coupled.

In addition, a separate blade mounting block 102 is fixedly installed on the outside of the mounting hole formed on the front surface of the top housing 30 corresponding to the installation position of the electric motor M, the front of the blade mounting block 102 At the same time as the blade 101 is rotated without interference in the position in which the blade 101 is rotated, a blade rotation space 103 having four edges is formed so that a portion of the air can flow out to the outside.

In addition, the motor shaft insertion hole 104 is formed in the center of the front surface corresponding to the blade rotation space 103, while the front surface corresponding to the upper side of the motor shaft insertion hole 104 is for the rotational operation of the blade 101. Accordingly, a through hole 105 that allows a portion of the external air introduced into the blade rotation space 103 to flow out is configured to be formed.

In addition, the lower end of the blade mounting block 102 blocks the lower portion of the mounting hole 31 formed on the front surface of the top housing 30 to cut the plate material according to the rotational operation of the circular saw 50 from the outside. The guide cap 106 for guiding air to be introduced into the interior of the top housing 30 through the mounting hole 31 is coupled with the screw 107 in the fitted state.

In addition, at the lower end of one side of the top housing 30, a discharge pipe 108 for discharging sawdust and dust generated during the plate cutting operation together with the air introduced from the outside protrudes to the outside while communicating with the inside of the top housing configured to be formed.

In the present invention, guide grooves 109 into which the guide rods 61 constituting the circular saw elevating member 60 are fitted may be formed on both sides of the blade mounting block 102 .

The operation of the present invention made in this way is as follows.

In the case of cutting a plate using the circular saw device 10 for cutting a plate according to the present invention, as shown in FIGS. 1 to 15, when the operation switch S is turned "ON", the electric motor (M ) is driven and the circular saw 50 fixedly coupled to the motor shaft 51 is rotated in place while protruding upward of the through hole 21 on the mounting plate 20 .

At the same time, if the plate to be cut is placed on the upper surface of the mounting plate 20 and pushed toward the circular saw 50, the plate is cut by the rapidly rotating circular saw 50.

In this process, when it is desired to adjust the protrusion height of the circular saw 50 according to the thickness of the plate to be cut, the electric motor M and the circular saw 50 are operated according to the operation of the circular saw lifting member 60 . The lifting operation is to be able to adjust the protrusion height of the circular saw (50).

On the other hand, if you want to adjust the cutting angle of the plate material, by manipulating the angle adjusting member 70 installed on the side plate 40, the inclination of the circular saw 50 from a vertically standing state to the side within an angle range of 45 °. can be adjusted in

In this way, it is possible to easily adjust the inclination of the circular saw 50 according to the cutting angle of the plate material.

In addition, since the safety cover member 80 is installed on the upper part of the circular saw 50 in the process of cutting the plate material, a safety accident caused by the sharp circular saw 50 rotating at high speed can be prevented.

On the other hand, if you want to adjust the front and rear position of the circular saw 50, as shown in FIGS. 6 to 9, the position adjusting bolt 93 constituting the circular saw position adjusting member 90 in the forward or reverse direction When rotated, the pitch of the positioning bolt 93 is shifted in the screw hole 91a on the first bracket 91, and the second bracket 92 fixed to the tip of the positioning bolt 93 is adjusted by the adjusted pitch. As it moves forward or backward, the front-rear position of the circular saw 50 is finely adjusted.

When the electric motor M is rotated during the cutting operation of such a plate, the circular saw 50 is rotated and the blade 101 is rotated in place at the same time. ) is introduced into the inside of the blade rotation space 103 on the blade mounting block 102 through the air inlet hole 52a, and a part of the introduced air flows out through the open side of the blade rotation space 103. and another part of the introduced air is introduced into the top housing 30 through the mounting hole 31 by the guiding action of the guide cap 106 (refer to FIGS. 11 to 15 ).

The external air introduced into the top housing 30 is circulated inside the top housing 30 together with sawdust and dust generated in the plate material cutting process, and then a discharge pipe 108 formed at the lower end of the side of the top housing 30 . ) is discharged to the outside and collected.

According to the present invention as described above, since the front-rear position of the electric circular saw 50 for cutting the plate material placed on the upper surface of the work table is finely adjusted by the action of the circular saw position adjusting member 90, the plate material is better It can be cut accurately, greatly improving workability.

In addition, the blade 101 is installed via the blade mounting block 102 on the motor shaft 51 that transmits the driving force of the electric motor M to the circular saw 50 from the back side of the motor cover 52 . External air flows into the inside of the top housing 30, and the outside air introduced into the top housing 30 is discharged to the outside through the discharge pipe 108 formed on the lower outside of the top housing 30 together with sawdust and dust. Because it is configured to be discharged, external scattering of sawdust and dust is prevented, and a pleasant working environment is maintained.

10: Circular saw device for cutting board

20: mounting plate 21: through hole

30: top housing 31: installer

40, 40': side plate 50: circular saw

51: motor shaft 52: motor cover

52a: air inlet hole 60: circular saw elevating member

61: guide rod 70: angle adjustment member

80: safety cover member 90: circular saw position adjusting member

91: first bracket 91a: screw hole

92: second bracket 92a: fixed hole

93: position adjustment bolt

100: sawdust discharge member 101: blade

102: blade mounting block 103: blade rotation space

104: motor shaft insertion hole 105: through hole

106: guide cap 107: screw

108: discharge pipe 109: guide groove

M : Electric motor S : Operation switch.

Claims

a mounting plate 20 having a through hole 21 formed on its upper surface in a direction coincident with the cutting direction of the plate; a top housing 30 having an upper opening and hinged rotatably to the left and right bottom surfaces of the mounting plate in a state disposed below the mounting plate 20 corresponding to the vertical downward direction of the through hole 21; side plates 40 and 40' which are erected and installed spaced apart from the side portions of the top housing 30 by a predetermined distance from the lower portions of both sides of the mounting plate 20; an electric motor (M) installed in the horizontal direction from the outside of the top housing (30) and driven according to the application of current; an operation switch (S) installed on one side of the side plate (40) and controlling the driving of the electric motor (M) during cutting of the plate material in a state in which the electric motor (M) and an external power source are electrically connected; In a state disposed inside the top housing 30 corresponding to the vertical downward direction of the through hole, the upper part is installed to protrude outward from the upper part of the through hole 21 on the mounting plate 20, and the electric motor ( A circular saw 50 to which the motor shaft 51 of M) is fixedly coupled and rotates in place according to the driving direction of the electric motor (M) to cut the plate material placed on the mounting plate; a circular saw elevating member 60 installed between the electric motor and the mounting plate and the side plate to vertically elevate the electric motor and the circular saw according to the thickness of the plate; an angle adjusting member 70 installed on the top housing and the side plate to adjust the inclination of the circular saw within an angle range of 45° laterally from a vertically standing state according to the cutting angle of the plate; When the plate is cut in the state of being installed above the upper part of the circular saw 50 protruding to the upper part of the through hole on the mounting plate 20, the operator is not injured by the rotating circular saw while being lifted upward by the thickness of the plate. In the circular saw device for cutting boards including a safety cover 80 to prevent,

Circular saw position adjustment that is installed at the lower end of the front side of the mounting plate 20 so that the position of the top housing 30 in which the circular saw 50 is accommodated is finely adjusted in the front-rear direction by an operation of rotating in the forward and reverse directions in place a member 90;

Installed on the outside of the front surface of the motor shaft 51 and the top housing 30 of the electric motor (M), the top housing 30 ) Circular saw device for cutting plate material, characterized in that it further comprises a sawdust discharge member (100) for allowing outside air to be introduced into the inside and then discharged to the lower outside of the top housing (30) together with sawdust.
According to claim 1,

The circular saw positioning member 90 extends downward from the lower end of one front side of the mounting plate 20 and includes a first bracket 91 having a screw hole 91a formed thereon;

A second bracket ( 92) and;

In a state in which the tip is screwed into the screw hole 91a on the first bracket 91, the tip is inserted into the fixing hole 92a on the second bracket 92 and coupled thereto. A circular saw device for cutting a plate, characterized in that it consists of a position adjusting bolt (93) for finely adjusting the position in the front-rear direction of the top housing (30) in which the saw (50) is built-in.
According to claim 1,

The sawdust discharging member 100 is covered with the outside of the electric motor (M), the rear surface of the motor cover 52 is formed with a plurality of air inlet holes (52a);

When the circular saw 50 is rotated according to the application of current in a state where it is fixedly fitted to the middle part of the motor shaft 51 of the electric motor M, it is rotated together while being rotated through the air inlet 52a. a blade 101 for allowing air to flow into the top housing 30;

It is fixedly installed outside the mounting hole formed on the front surface of the top housing 30 corresponding to the installation position of the electric motor M, and rotates without interference while the blade 101 is positioned on the front surface of the blade 101. A blade rotation space 103 having four edges open so that a part of the air introduced during the rotation operation flows out to the outside is formed, and a motor shaft insertion hole 104 is formed in the center of the front corresponding to the blade rotation space 103 . ) is formed, and on the front surface corresponding to the upper side of the motor shaft insertion hole 104, a portion of the air introduced into the blade rotation space 103 according to the rotational operation of the blade 101 is discharged to the outside. a blade mounting block 102 having a through hole 105 formed therein;

It is inserted into the lower end of the blade mounting block 102 and coupled with a screw 107, blocks the lower portion of the mounting hole 31 formed in the front of the top housing 30, and drives the electric motor M and the circular saw ( 50) a guide cap 106 for guiding a portion of the external air introduced in accordance with the rotational operation to be introduced into the top housing 30 through the mounting hole 31;

It is formed to protrude from the lower end of one side of the top housing 30 to the outside while communicating with the inside of the top housing 30, and sawdust and dust generated during the plate cutting operation are discharged together with the air introduced from the outside. Circular saw device for cutting board, characterized in that consisting of a discharge pipe (108).
4. The method of claim 3,

A circular saw device for cutting boards, characterized in that guide grooves (109) into which guide rods (61) constituting the circular saw elevating member (60) are fitted are formed on both sides of the blade mounting block (102).