Stationary circular saw cutting machine with dust collecting function

Abstract

To provide an installation type circular saw cutting machine having a dust collecting function capable of improving dust collecting capacity with a compact constitution.SOLUTION: A circular saw cutting machine 1 includes a blade case 40, a cyclone type separator 60, and a sirocco fan 80 (centrifugal separator), and an air supply port 451 is provided at an end part on the starting position side of the blade case 40, and a discharge port 441 is provided at an end part on the advancing direction side of a circular saw 31. The exhaust port 802 of the sirocco fan 80 and the air supply port 451 of the blade case 40 are connected by piping, the discharge port 441 of the blade case 40 and the intake port 611 of the cyclone separator 60 are connected by piping, the upper opening of the inner cylinder 64 of the cyclone separator 60 and the air intake port 801 of the sirocco fan 80 are connected, and the lower opening of the outer cylinder 61 of the cyclone separator 60 and the dust collection port 701 of the dust collection container 70 are connected. Air within the apparatus 1 circulates and passes through the cyclonic separator 60 a number of times.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a table saw that is installed on the ground and equipped with a dust collection function for collecting chips and dust (hereinafter collectively referred to as "chips") generated when cutting workpieces (workpieces) such as long aluminum sections using a circular saw that rotates vertically at high speed.In particular, the present invention relates to an undercut-type circular saw cutting machine in which the top of the saw blade protrudes above the surface of the table on which the workpiece is placed. [Background technology]

[0002] A stationary circular saw cutter is a device that is fixed to a stable base such as the ground and cuts a workpiece placed on a table by pressing a circular saw that rotates at high speed against it. Some such devices have grooves in the table that open at the top and bottom, with the upper part of the saw blade protruding from the groove. The circular saw can move back and forth along the groove while rotating at high speed, and by moving the circular saw forward toward the workpiece placed across the groove, the saw blade is pressed against the workpiece to cut it.

[0003] Typically, a circular saw rotates in a direction that causes the saw blade to strike the workpiece from the top to the bottom. Depending on the material of the workpiece, chips may consist of resin (e.g., vinyl chloride, acrylic), wood (e.g., structural materials for homes), or metal (e.g., steel or non-ferrous metals), and are characterized by their small size and tendency to move and scatter in the wind. Chips generated during processing with a circular saw are blown downward by the airflow generated by the rotation of the circular saw. Conventionally, a blade case that surrounds the bottom of the circular saw is attached to the underside of the table along a groove, so that the chips blown downward pass through the groove and are collected in the blade case.

[0004] Conventionally, a known dust collection device for collecting chips contained in a blade case involves attaching a dust bag to the blade case, and allowing the chips to flow into the bag with the airflow generated by the rotation of the circular saw. However, this device has the problem that the filter in the dust bag easily becomes clogged with chips, gradually reducing dust collection efficiency and making maintenance a burden.

[0005] In this regard, Patent Document 1 is known as a technology for collecting chips without using a filter. This technology is a dust collector for a stationary cutting machine that has a table on which the material to be cut (workpiece) is placed, and a cutting machine body that is installed below the table and has a saw blade protruding from the top surface of the table, and is connected to a blade case that covers the bottom of the saw blade, and uses the effect of centrifugally separating chips from the air by swirling the air flow generated by the rotation of the saw blade (see paragraph

[0009] , second paragraph). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-21835 Summary of the Invention [Problem to be solved by the invention]

[0007] The technology disclosed in Patent Document 1 is excellent in that it uses cyclone action as a dust collection means, but is insufficient in that the air after passing through the dust collector (air that passes through the lower end of the inner tube 3 and is exhausted to the outside from the exhaust port 3a) is released directly into the atmosphere. That is, this technology is based on the technical idea that chips can be separated and collected by passing them through a cyclone separator once, but because the swirling flow for centrifugal separation of the chips is generated by the air flow generated by the rotation of the saw blade, if the air flow is weak, the chips may be sucked into the inner tube before being separated inside the dust collector, and the air containing the chips may be scattered outside from the upper opening of the inner tube.

[0008] In this regard, methods have been considered to incorporate a blower to strengthen the airflow supplied to the dust collector (to increase the swirling force), but simply incorporating a powerful blower would result in the entire device becoming larger and more expensive.

[0009] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a stationary circular saw cutting machine with a dust collection function that has a compact configuration and can improve dust collection capacity, in other words, to provide a stationary circular saw cutting machine with a dust collection function that can prevent chips from being missed and improve the chip recovery rate while preventing the entire device from becoming larger. [Means for solving the problem]

[0010] The stationary circular saw cutting machine with dust collection function of the present invention comprises a table that is installed on the ground and has grooves that open at the top and bottom, a circular saw that is placed in the groove so that the upper side of the saw blade protrudes above the table surface and moves back and forth along the groove, and a blade case that is installed under the table along the groove and surrounds the underside of the circular saw, and by rotating the circular saw and moving it forward from a predetermined starting position, it cuts a workpiece that is placed on the table so as to straddle the groove, and the stationary circular saw cutting machine comprises an outer cylinder with an intake port on the side, and a cyclone separator that has an inner cylinder that is placed inside the outer cylinder and opens in the vertical direction, and a dust collection port on the top surface of the outer cylinder The saw blade has a dust collection container placed below the lower opening, and a centrifugal blower which has an air intake opening downward and an air exhaust opening to the side, and which takes in gas from the direction of the rotation axis and exhausts it in a direction perpendicular to the direction of the rotation axis, and the blade case has an air intake port provided at the end on the starting position side of the circular saw and an exhaust port provided at the end on the forward direction side of the circular saw, and is characterized in that the exhaust port of the centrifugal blower is connected by piping to the air intake port of the blade case, the exhaust port of the blade case is connected by piping to the intake port of the cyclone separator, the upper opening of the inner tube of the cyclone separator is connected to the air intake port of the centrifugal blower, and the lower opening of the outer tube of the cyclone separator is connected to the dust collection port of the dust collection container.

[0011] The blade case is preferably a housing fixed to the back surface of the table, with the air intake port of the blade case opening near the bottom of the side surface on the starting position side of the circular saw, and the air exhaust port of the blade case opening near the bottom of the side surface on the forward direction side of the circular saw. Preferably, the present invention further comprises a blade cover that is provided above the table and covers the upper side of the circular saw that protrudes above the table surface. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a stationary circular saw cutter with a dust collection function that has a compact configuration and can improve dust collection capacity. Because a filter is not required as a dust collection means, problems such as clogging caused by the filter and the burden of maintenance described above do not occur. However, the present invention has the following advantages that are not found in conventional cutters.

[0013] That is, according to the present invention, the airflow generated by the high-speed rotation of the saw blade draws most of the chips generated during the cutting process into the blade case through the groove. The forward airflow generated by the forward movement of the circular saw and the airflow from the centrifugal blower generate an airflow within the blade goose from the end (air inlet) on the starting position side to the end (exhaust port) on the forward movement side. Therefore, the chips in the blade goose flow toward the forward movement side (exhaust port) of the blade case and into the cyclone separator (outer cylinder) connected to the outlet port through a pipe. In the separator, most of the chips, which are heavier than air, are separated and fall into a dust collection container. The air in the cyclone separator is drawn in through the inner cylinder by the centrifugal blower, flows again from the exhaust port into the air inlet located at the end of the blade case on the starting position side, blows away the chips inside the blade case, and then flows back into the cyclone separator. That is, chips that are not completely separated in the cyclone separator and are sucked from the inner cylinder are sent back into the blade case and then sent back into the cyclone separator.

[0014] The air circulation continues while the centrifugal blower is operating. The present invention is not based on the premise that chips can be separated and collected by passing the air through the cyclone separator once. Rather, the present invention has a technical feature of circulating the air within the device, allowing it to repeatedly pass through the cyclone separator, thereby reducing chip loss and improving chip collection rate (dust collection capacity). While the present invention uses air blown by a centrifugal blower to move the chips, it also utilizes the airflow (rotational flow) generated by the rotation of the circular saw and the airflow generated by the forward movement of the circular saw. Furthermore, the air circulates within the device and passes through the cyclone separator multiple times. This allows for sufficient dust collection capacity without the need for a large blower or suction device, making it possible to provide a compact circular saw cutting machine.

[0015] A centrifugal blower is a blower that draws in air from the direction of the rotation axis and exhausts it in a direction perpendicular to the rotation axis, such as a sirocco fan or turbo fan. The centrifugal blower's intake port opens downward, and an inner cylinder that opens vertically is connected to this intake port. Furthermore, a dust collection container is located below the lower opening of the outer cylinder. This configuration allows chips in the centrifugal blower to fall straight into the dust collection container, thereby improving dust collection capacity. Additionally, the airflow from the centrifugal blower generates an airflow in the blade case in the forward direction (from the end on the starting position side toward the end on the forward direction side), which also has the effect of making it difficult for chips to accumulate in the blade case. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a simplified diagram showing the appearance of the circular saw cutter from the rear side. [Figure 2] FIG. 2 is a diagram showing a simplified appearance of the circular saw cutter from the right side. [Figure 3] FIG. 2 is a diagram showing a simplified appearance of the circular saw cutting machine from above. [Figure 4] FIG. 2 is a diagram showing a simplified internal configuration of the circular saw cutting machine from the front side. [Figure 5]This is a simplified diagram showing the internal structure of the circular saw cutting machine from the right side, with the drawing of the air duct and guide pipes omitted. [Figure 6] FIG. 2 is a diagram showing a simplified configuration of the circular saw cutting machine from the right side, particularly showing the standby state before cutting and the direction of air flow in the piping. [Figure 7] FIG. 1 is a diagram showing a simplified configuration of a circular saw cutter from the right side, particularly showing the state after cutting the workpiece and the direction of air flow in the piping. DETAILED DESCRIPTION OF THE INVENTION

[0017] The following describes in detail the stationary circular saw cutter with a dust collection function of the present invention with reference to the drawings, but the present invention is not limited to these embodiments. FIG. 1 is a simplified view of the appearance of the circular saw cutter 1 from the rear side, with some parts omitted. FIG. 2 is a simplified view of the appearance of the circular saw cutter 1 from the right side, with some parts omitted. FIG. 3 is a simplified view of the appearance of the circular saw cutter from the top side, with some parts omitted. FIG. 4 is a simplified view of the internal configuration of the circular saw cutter 1 from the front side, with some parts omitted. FIG. 5 is a simplified view of the internal configuration of the circular saw cutter 1 from the right side, with some parts omitted. To explain the power mechanism described below, the air duct 91 and guide duct 92 are omitted. FIG. 6 is a simplified (partially omitted) view of the configuration of the circular saw cutter 1 from the right side, particularly showing the standby state before cutting and the direction of air flow within the piping. 7 is a simplified (partially omitted) right side view of the circular saw cutting machine 1, particularly showing the state after the workpiece has been cut and the direction of air flow in the piping. The arrows in FIGS. 1, 3, 6, and 7 indicate the flow of air circulating within the device 1.

[0018] As shown by the arrows in Figures 1, 3, 6 and 7, the present invention is configured so that air circulates within the device 1 and repeatedly passes through the cyclone separator 60, preventing chips from being missed and improving the chip recovery rate.It can also provide sufficient dust collection capacity without the need for a large air blower or suction machine, and can provide a circular saw cutting machine with a compact overall configuration.

[0019] The circular saw cutting machine 1 is a processing device that is installed on the ground and equipped with a dust collection function for separating and collecting chips generated when a workpiece (workpiece) such as a long aluminum section is cut using a vertically rotating circular saw 31. It is an undercut cutting machine for aluminum sections that is fixed to a stable base such as the ground and cuts the workpiece W placed on the table 20 by pressing the high-speed rotating circular saw 31 against it. The underside of the table 20 is equipped with a power mechanism that rotates the circular saw 31 at high speed and moves it back and forth, and the above side of the table 20 is equipped with an elevator mechanism that presses the workpiece W on the table 20 to hold it in a predetermined position, and behind the table 20 (to the right in Figure 2 ) are equipped a cyclone separator 60 that separates and collects chips, a dust collection container 70, and a sirocco fan 80, all of which are part of the dust collection mechanism.

[0020] The circular saw cutting machine 1 includes a table 20 that is installed on the ground and has a groove 201 that opens at the top and bottom, a circular saw 31 that is placed in the groove 201 so that the upper side of the saw blade protrudes above the table surface and moves back and forth along the groove 201, and a blade case 40 that is installed below the table 20 along the groove 201 and surrounds the underside of the circular saw 31. The circular saw 31 rotates in a direction in which the saw blade strikes the workpiece from the top side toward the bottom side (counterclockwise in the case shown in FIG. 2). By moving the circular saw 31 forward from a predetermined starting position (in the direction of contact with the workpiece), the workpiece W placed on the table 20 is cut across the groove 201. The circular saw cutting machine 1 has a cyclone separator 60 which has an outer cylinder 61 with an intake port 611 on the side, and an inner cylinder 64 which is arranged inside the outer cylinder 61 and opens in the vertical direction, a dust collection container 70 which is arranged below the lower opening of the outer cylinder 61, and a sirocco fan 80 which serves as a centrifugal blower which has an air intake port 801 which opens downward and an exhaust port 802 which opens to the side, and which draws in gas from the direction of the rotation axis and exhausts it in a direction perpendicular to the direction of the rotation axis.

[0021] The table 20 is supported by a base 21 so that its upper surface is horizontal. The workpiece W is placed on the upper surface of the table 20. The table 20 has grooves 201 that open to the top and bottom surfaces and extend linearly. A column 23 and a plurality of L-shaped back support rulers 22 are provided on the top surface of the table 20. The column 23 is composed of an attachment part 23a that is disposed above the groove 201 and extends in the direction of extension of the groove 201, and an upright part 23b that supports the attachment part 23a and is fixed to the base 21. An elevation mechanism is provided on the attachment part 23a. The elevation mechanism is an air cylinder 24 that extends and contracts in the vertical direction. A material holder 25 equipped with a pad that deforms according to the shape of the workpiece is attached to the lower end of the air cylinder 24, and with the workpiece W placed against the back ruler 22, the material holder 25 is lowered to press down on the workpiece W, thereby holding the workpiece W in a predetermined position. The material holder 25 also serves as part of the blade cover 50 (see Figure 7), and has an inverted concave cross section when viewed from the front to allow the circular saw 31 to pass through, and a window 251 is provided on the side to allow the cutting status to be visually confirmed.

[0022] The circular saw 31 is attached so that the upper side of its saw blade protrudes from the groove 201. The circular saw 31 is operated by a power mechanism. The power mechanism includes a blade motor 32 that rotates the circular saw 31 at high speed, a slider 33 on which the blade motor 32 is installed, a guide 34 that is arranged parallel to the groove 201 and on which the slider 33 is mounted so that it can move back and forth, an air-hydro cylinder 35 that moves the slider 33 back and forth, and a hydro tank 36 (see Figure 5) connected to the air-hydro cylinder 35. Operation of the blade motor 32 rotates the circular saw 31, and operation of the air-hydro cylinder 35 moves the blade motor 32 and the attached circular saw 31 back and forth along the groove 201 (moving left and right in Figures 2, 5-7). The circular saw 31 can be replaced depending on the dimensions and material of the workpiece W.

[0023] To prevent chips from scattering, a blade cover 50 is provided above the table 20 to cover the upper side of the circular saw 31 that protrudes above the table surface. The blade cover 50 is composed of a rear blade cover 51, a workpiece holder 25, and a front blade cover 52. The rear blade cover 51 is a component with an inverted concave cross section when viewed from the front, which covers the upper side of the circular saw 31 when it is in the starting position, and is fixed to the rear end of the table 20. The front blade cover 52 is a component with an inverted concave cross section when viewed from the front, which covers the upper side of the circular saw 31 when it is in the forward position, and is fixed to the front end of the table 20. The workpiece holder 25 is positioned between the rear blade cover 51 and the front blade cover 52. The workpiece holder 25 is lowered during material processing and raised after processing is completed. The blade covers 51, 52 and the lowered material holder 25 define a space within which the circular saw 31 (or the upper side thereof) can reciprocate. Cutting operations can be performed safely with the circular saw 31 covered by the blade cover 50. In the illustrated example, the material holder 25 and the front blade cover 52 are configured as separate bodies, but they may also be integrated. Furthermore, the front blade cover and the rear blade cover may be configured to be raised and lowered by an air cylinder, just like the material holder 25.

[0024] The blade case 40 is a member that is provided along the groove 201 on the underside of the table 20 and surrounds the underside of the circular saw 31. The blade case 40 is a box-shaped member that has a left side surface 41 and a right side surface 42 that are arranged substantially parallel to the groove 201 so as to sandwich the circular saw 31, a bottom surface 43, a rear end surface 45 that is arranged on the starting position side of the circular saw, and a front end surface 44 that is arranged on the forward direction side of the circular saw, and has an upper surface that opens into the groove 201. To rotate the circular saw 31 housed in the blade case 40, the left side surface 41 has an opening 411 (see FIG. 4) that is arranged along the traveling direction of the slider 33 and through which the rotating shaft of the blade motor 32 is inserted. The blade case 40 has an air intake port 451 provided at the end on the starting position side of the circular saw 31 and an exhaust port 441 provided at the end on the forward direction side of the circular saw 31. Preferably, as shown in the figure, the air intake port 451 is provided so as to open near the bottom of the side surface on the starting position side of the circular saw 31 (near the bottom surface of the rear end surface 45), and the exhaust port 441 is provided so as to open near the bottom of the side surface on the forward direction side of the circular saw 31 (near the bottom surface of the front end surface 44). To make it easier to collect chips, the bottom surface 43 may be formed in a generally V-shape or a generally U-shape.

[0025] In addition to the blade cover 50 and blade case 40, the circular saw cutting machine 1 is equipped with a dust collection mechanism including a cyclone separator 60, a dust collection container 70, a sirocco fan 80 (centrifugal blower), a PVC air supply pipe 91 connecting an air inlet 451 of the blade case 40 to an exhaust port 802 of the sirocco fan 80, a guide pipe 92 connecting an exhaust port 441 of the blade case 40 to an intake port 611 of the cyclone separator 60, and a waste pipe 94 connecting a lower opening of the outer cylinder 61 of the cyclone separator 60 to a dust collection port 701 of the dust collection container 70. The guide pipe 92 is composed of a spiral duct 921 disposed inside the frame 21 and one end connected to the exhaust port 441, and a PVC duct hose 922 having one end connected to the other end of the spiral duct 921 and the other end connected to the intake port 611 of the cyclone separator 60. The upper opening of the inner cylinder 64 of the cyclone separator 60 is directly connected to the intake port 801 of the sirocco fan 80, but may be connected via a pipe. The lower opening of the outer cylinder 61 and the dust collection port 701 of the dust collection container 70 may be directly connected.

[0026] The cyclone separator 60 includes an outer cylinder 61 having an inlet 611 on its side, and an inner cylinder 64 that is disposed inside the outer cylinder 61 and opens in the vertical direction. The inlet 611 is disposed eccentrically with respect to the central axis of the outer cylinder 61. The airflow containing chips that flows into the outer cylinder 61 from the inlet 611 causes chips with a high specific gravity to gradually fall while swirling in the circumferential direction along the inner surface of the outer cylinder 61, and the air inside the separator 60 is sucked in by the sirocco fan 80 through the lower opening of the inner cylinder 64 and the upper opening.

[0027] The dust collection container 70 is placed below the lower opening of the outer cylinder 61. A dust collection port 701 is provided on the upper surface of the dust collection container 70. A pail can, for example, can be used as the dust collection container 70. The upper end of a waste pipe 94 is connected to the lower opening of the inner cylinder 64, and the dust collection port 701 is detachably connected to the lower end of the waste pipe 94. Chips that fall from the lower opening are collected in the dust collection container 70 through the waste pipe 94. The dust collection container 70 is removed from the waste pipe 94, and the collected chips are discarded.

[0028] Sirocco fan 80 is a multi-blade blower with multiple built-in blades and equipped with intake port 801 opening downward and exhaust port 802 opening to the side. When sirocco fan 80 is operated, an airflow is generated from intake port 801 toward exhaust port 802, drawing in air from the direction of the rotation axis and exhausting it in a direction perpendicular to the direction of the rotation axis. Negative pressure is created on the side of intake port 801, and air is sucked from inside separator 60 via inner cylinder 64. Preferably, sirocco fan 80 is operated while blade motor 32 is operating, so that the above-mentioned airflow is constantly generated by sirocco fan 80 while circular saw 31 is rotating.

[0029] To prevent chips separated by cyclone separator 60 and chips collected in dust collection container 70 from being sucked into sirocco fan 80 and circulating back into blade case 40, sirocco fan 80 has an air intake 801 that opens downward, and inner cylinder 64 that opens in the vertical direction is connected to this air intake 801, with dust collection container 70 located below the lower opening of outer cylinder 61. Inside sirocco fan 80, the airflow changes from the direction of the rotation axis (upward) to a direction perpendicular to this (left-right direction). Also, because cyclone separator 60 and dust collection container 70 are arranged vertically, chips inside sirocco fan 80 tend to fall straight into dust collection container 70.

[0030] More preferably, the following configuration may be adopted. That is, the outer cylinder 61 includes an upper cylindrical portion 62 having the same inner diameter, and a lower cylindrical portion 63 connected to the upper cylindrical portion 62 and having a tapered surface whose inner diameter decreases downward. An intake port 611 is provided in the upper cylindrical portion 62. By setting various dimensions so that the lower opening 63 of the inner cylinder 64 is positioned within the upper cylindrical portion 62 of the outer cylinder 61, chips separated in the lower cylindrical portion 63 are less likely to be sucked into the inner cylinder 64. Furthermore, by forming the lower cylindrical portion 63 vertically longer than the upper cylindrical portion 62 and providing a sufficient length for the waste pipe 94, chips contained in the dust collection container 70 are less likely to be sucked in by the suction force of the sirocco fan 80, thereby suppressing backflow.

[0031] An example of the procedure for carrying out the present invention will be described below. In a standby state before cutting, the circular saw 31 is in the starting position, as shown in FIGS. 5 and 6. In this state, the workpiece W is placed on the table 20, and the material holder 25 is lowered to hold the workpiece W in a predetermined position. The pad of the material holder 25 deforms according to the shape of the workpiece. Next, the sirocco fan 80 and the power mechanism are activated to generate a forward-direction airflow within the blade case 40. This generates an airflow in the direction indicated by the arrows in FIGS. 1, 3, and 6, circulating air within the circular saw cutting machine 1. The circular saw 31 then rotates counterclockwise at high speed to cut the workpiece. Most of the chips generated during this process are sucked into the groove 201 by the rotational flow of the circular saw 31 (see FIG. 7) and the air flow within the blade case 40. The upper side of the circular saw 31 is enclosed by the blade cover 50 (see FIG. 7), preventing chips from scattering.

[0032] The chips contained in the blade case 40 flow into the cyclone separator 60 through the guide pipe 92 due to the rotational flow of the circular saw 31, the airflow generated by the forward movement of the circular saw 31, and the airflow from the sirocco fan 80 that flows from the air inlet 451 toward the outlet 441. The air inlet 451 opens near the bottom of the side surface (rear end surface 45) on the starting position side, and the outlet 441 opens near the bottom of the side surface (front end surface 44) on the forward movement side. This allows the air to flow along the bottom surface 43 of the blade case 40, making it difficult for chips to accumulate inside the blade case 40. In the separator 60, the air and chips are separated, and the heavy chips fall into the dust collection container 70. The air inside the dust collector is drawn into the sirocco fan 80 through the inner tube 64. However, the air containing chips that were not completely separated is sent back into the blade case 40.

[0033] As described above, according to the present invention, air circulates within the device, and chips that are not completely separated within the cyclone separator 60 pass through the cyclone separator 60 again. By repeatedly passing through the cyclone separator 60, it is possible to reduce the amount of chips that are missed, and to increase the dust collection capacity. By configuring the air within the device to circulate and pass through the cyclone separator 60 multiple times, sufficient dust collection capacity can be achieved without the need for a large air blower or suction device, and a compact circular saw cutting machine can be provided, allowing it to be installed compactly even in a small space.

[0034] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

[0035] The present invention can be applied to a stationary circular saw cutting machine used to cut aluminum frames, aluminum sash building materials, drawn copper, resin materials such as PVC and acrylic, wood for residential construction materials, and various other materials. [Explanation of symbols]

[0036] 1. Circular saw cutting machine with dust collection function 20 tables 201 Groove 21 Mounting stand 24 Air cylinder 31 Circular Saw 40 Blade Case 44 Front end section 441 Outlet 45 Rear end surface 451 Air supply port 50 Blade Cover 51 Rear blade cover 52 Front blade cover 60 Cyclone separator 61 Outer cylinder 611 Intake 64 Inner cylinder 70 Dust collection container 701 Dust collection port 80 Sirocco fan (centrifugal blower) 801 Air intake 802 exhaust port 91 Air pipe 92 Guide tube 94 Waste pipe W Workpiece

Claims

1. a table having grooves that open at the top and bottom and that is installed on the ground; a circular saw that is disposed in the groove so that an upper side of the saw blade protrudes above the table surface and that reciprocates along the groove; a blade case provided under the table along the groove and surrounding the underside of the circular saw; A stationary circular saw cutting machine in which the circular saw is moved forward from a predetermined starting position while rotating, thereby cutting a workpiece placed on the table so as to straddle the groove, a cyclone separator including an outer cylinder having an inlet on a side thereof and an inner cylinder disposed inside the outer cylinder and opening in the vertical direction; a dust collection container having a dust collection port on its upper surface and disposed below a lower opening of the outer cylinder; a centrifugal fan having an intake port opening downward and an exhaust port opening to the side, which takes in gas from the direction of the rotation axis and exhausts gas in a direction perpendicular to the direction of the rotation axis; and the blade case has an air inlet provided at an end on the starting position side of the circular saw and an air outlet provided at an end on the forward direction side of the circular saw, an exhaust port of the centrifugal fan and an air inlet of the blade case are connected by piping; a piping connection between the outlet of the blade case and the inlet of the cyclone separator; an upper opening of the inner cylinder of the cyclone separator and an intake port of the centrifugal blower are connected; The lower opening of the outer cylinder of the cyclone separator is connected to the dust collection port of the dust collection container. A stationary circular saw cutting machine with a dust collection function characterized by:

2. the blade case is a housing fixed to the back surface of the table, The air intake port of the blade case opens near the bottom of the side surface on the starting position side of the circular saw, and the air exhaust port of the blade case opens near the bottom of the side surface on the forward direction side of the circular saw.

2. The stationary circular saw cutting machine with a dust collection function according to claim 1.

3. A blade cover is provided above the table and covers the upper side of the circular saw protruding above the table surface.

3. A stationary circular saw cutting machine with a dust collection function according to claim 1 or 2.

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