JP4762642B2 - Cutting machine - Google Patents

Description

  The present invention relates to a cutting machine having a dust collector for collecting dusts generated by cutting, for example, a portable cutting machine that is moved by an operator and held by hand.

For example, a portable cutting machine called a circular saw machine is equipped with a cutting machine body equipped with a circular saw blade that rotates using an electric motor as a drive source, and a base mounted on a cutting material. When the operator moves the cutting machine main body along the cutting direction while being placed on the upper surface of the material, the cutting material can be cut by the saw blade protruding to the lower surface side of the base.
In such a portable cutting machine, a device for efficiently collecting dust generated by cutting has been conventionally made.
For example, in Japanese Utility Model Laid-Open No. 5-5332 or Japanese Patent Laid-Open No. 11-58305, a dust collecting path is provided inside a blade case that covers the upper portion of a circular saw blade, and air generated by the rotation of the saw blade from the cutting site. A technique is disclosed in which swarf is prevented from being scattered around the cutting site by guiding the swarf wound upward in the dust collection path in a dust collecting path.
Japanese Utility Model Publication No. 5-5332 JP-A-11-58305

However, in the above conventional cutting machine, a cloth dust bag is attached to the leeward side of the blade case or a separately prepared dust collector hose is connected to collect the dust that has been rolled up in the blade case. Then, the dust was forcibly collected. In the former dust collection method, there is a problem that the dust collection bag is clogged and the dust collection efficiency tends to be lowered. In the latter dust collection method, it is necessary to connect a dust collector separately, and the cost is high. There was a problem that the portability of the machine was impaired.
The present invention has been made to solve this problem, and provides a cutting machine equipped with a dust collector that does not cause clogging like a dust bag and does not impair the portability of the cutting machine. The purpose is to do.

This problem is solved by the following inventions.
1st invention is equipped with the base mounted in a cutting material, the cutting machine main body supported by the upper surface of this base, a cutting machine main body is a saw blade rotated by an electric motor, and a blade case which covers the circumference | surroundings of a saw blade A cutting machine in which chips are wound up in the blade case by mixing with the saw blade rotating wind generated by the rotation of the saw blade, and a cyclone type dust collector is provided on the leeward side of the blade case .
According to the first invention , since the chips blown up in the blade case are collected by the cyclone type dust collector, clogging does not occur as in the case of the conventional dust collecting bag, and separately. The portability of the cutting machine is not impaired by connecting the prepared forced dust collector.
According to a second invention, in the first invention, the dust collector includes an outer cylinder and an inner cylinder inside the outer cylinder, and the outer cylinder is a cutting machine connected to an exhaust port provided on the leeward side of the blade case .
According to the second aspect of the present invention , the cyclone dust collector is provided on the leeward side of the blade case, so that the chips that are wound up in the blade case by the saw blade rotating wind can be efficiently collected.
In a third aspect of the invention according to the second aspect of the invention, the saw blade rotating air exhausted from the inner cylinder is circulated to the windward side of the blade case and blown to the smear line guide portion provided at the front end portion in the cutting progress direction of the base. It is a cutting machine .
According to 3rd invention , it is the saw blade rotary wind exhausted from an inner cylinder, Comprising: By spraying the air after the swarf is centrifuged in an outer cylinder to a Sumi line guide part, the said Sumi line guide It is possible to make it easier to visually check the smear line guide part by blowing away the chips that are scattered and deposited on the part, and the exhaust from the cyclone type dust collector can be used effectively.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a schematic overall configuration of a cutting machine 1 described below. In FIG. 1, the flow of motor cooling air and cutting powder (cutting powder), which will be described later, are indicated by white arrows. In the embodiment described below, a portable circular saw is illustrated as an example of a cutting machine.
The cutting machine 1 includes a cutting machine body 10 including a circular saw blade 12 that is rotated by an electric motor 11 and a base 2 that supports the cutting machine body 10 on the upper surface side.
The cutting machine main body 10 includes a blade case 13 that covers a substantially half range of the upper side of the saw blade 12. The electric motor 11 is disposed on the back side (upper side in FIG. 3) of the blade case 13. The electric motor 11 is attached so that the front end of the motor case 17 is joined to a cylindrical motor mounting base 13 a provided on the back side of the blade case 13 and protrudes from the back side of the blade case 13 to the side. Yes. For this reason, the machine axis of the electric motor 11 (the rotation axis of the rotor 11 a) is orthogonal to the saw blade 12.
The output shaft 15 of the electric motor 11 (the rotation shaft of the rotor 11a) is connected to a reduction gear train (not shown) incorporated in the motor mounting base portion 13a. A cooling fan 14 is attached to the output shaft 15. The cooling fan 14 rotates integrally with the output shaft 15. When the cooling fan 14 rotates, outside air (cooling air) is introduced into the interior of the electric motor 11 through the cooling air intake port 16 provided on the rear surface of the motor case 17. The introduced cooling air flows toward the front portion of the motor case 17, thereby cooling the interior of the electric motor 11. The cooling air reaching the front of the motor case 17 is blown into the motor mounting base 13a, and then a part of the cooling air is exhausted into the blade case 13 through the exhaust ports 19 to 19, and the rest is the motor mounting base 13a. The air is blown into the air passage 20 through the cooling air outlet 18 provided on the side of the air.
The ventilation path 20 is provided along the back surface of the blade case 13. One end side (windward side) of the ventilation path 20 is communicated with the cooling air blowing port 18, and the other end side (leeward side) is opened near the dust collection port 21 a of the dust collection path 21 described below.
The exhaust ports 19 to 19 are provided on the back side of the blade case 13 and around the output shaft 15 of the electric motor 11 as shown in FIG. In addition, an illumination tool 29 for brightly illuminating the cutting portion C of the saw blade 12 is provided on the side of the blade case 11 on the back side.
Further, a handle portion 45 for an operator to hold is provided on the rear surface side of the blade case 13 and on the upper surface of the base portion side (motor mounting base portion 13a side) of the motor case 17.

Next, as shown in FIG. 2, the blade case 13 has a semicircular arc shape that covers a substantially half range of the upper side of the saw blade 12. Further, as shown in FIG. 5, the blade case 13 has a width capable of accommodating a saw blade 12 and a safety cover 25 (to be described later) and a depth guide 26 having a strip shape inside. The blade case 13 and thus the cutting machine main body 10 has its front end side (right end portion in FIG. 2) in the cutting progress direction (right direction in FIG. 2) rotated up and down to the base 2 side via the vertical movement support shaft 24. Supported as possible. On the other hand, the rear end side (left end portion in FIG. 2) of the blade case 13 in the cutting progress direction is connected to a strip-shaped depth guide 26 provided in an upright state on the upper surface of the base 2. The depth guide 26 is positioned so as to be relatively movable along the inner periphery of the blade case 13. A fixing pin 27 is inserted between the depth guide 26 and the blade case 13. By displacing the fixing pin 27 in the axial direction by tilting the lever 28, the blade case 13 is fixed to the depth guide 26, and the fixed state is released. With the depth guide 26 released from being fixed, the blade case 13 and thus the cutting machine main body 10 are tilted up and down about the vertical movement support shaft 24 to project the saw blade 12 to the lower surface side of the base 2. Thus, the depth of cut of the so-called saw blade 12 can be adjusted.
Further, the blade case 13 and thus the cutting machine main body 10 can be tilted to the left and right in the cutting progress direction with respect to the base 2, thereby enabling so-called tilt cutting. As shown in FIGS. 2 to 4, the front angular plate 30 is provided in a standing state at the front end of the base 2 in the cutting progress direction. A front bracket 32 is supported on the front angular plate 30 via a front support shaft 31 (FIG. 4) so as to be tiltable left and right with respect to the cutting progress direction. The vertical movement support shaft 24 is provided on the front bracket 32. A front fixing screw 33 is fastened between the front angular plate 30 and the front bracket 32. When the front fixing screw 33 is loosened, the front bracket 32 can be tilted to the left and right in the cutting progress direction around the front support shaft 31, and when the front fixing screw 33 is tightened, the front bracket 32 is moved relative to the front angular plate 30. Fixed so that it cannot tilt.

A similar left / right tilt mechanism is also provided on the rear end side of the base 2 in the cutting progress direction. As shown in FIGS. 4 to 6, a rear angular plate 35 is provided in an upright state on the upper surface of the rear end of the base 2. A rear bracket 37 is supported on the rear angular plate 35 via a rear support shaft 36 disposed coaxially with the front support shaft 31 so as to be tiltable to the left and right with respect to the cutting progress direction. The depth guide 26 is provided on the rear bracket 37. A rear fixing screw 38 is fastened between the rear angular plate 35 and the rear bracket 37. When the rear fixing screw 38 is loosened, the rear bracket 37 can be tilted to the left and right in the cutting progress direction about the rear supporting shaft 36, and when the rear fixing screw 38 is tightened, the rear bracket 37 is moved relative to the rear angular plate 35. Thus, the rear bracket 37 is fixed so as not to tilt.
Therefore, when the front and rear fixing screws 33 and 38 are loosened, the blade case 13 and thus the cutting machine main body 10 can be tilted to the left and right with respect to the cutting progress direction. When the front and rear fixing screws 33 and 38 are tightened, the blade case 13 As a result, the cutting machine main body 10 can be fixed at any left-right tilt position. Further, in a state where the cutting machine body 10 is fixed at an arbitrary left and right tilt position, the cutting machine body 10 is tilted up and down about the vertical movement support shaft 24 by further tilting the lever 28 to saw blade 12. It is possible to adjust the depth of cut (projecting dimension from the base 2).

Next, the dust collection passage 21 is formed in the range from the vicinity of the front end to the vicinity of the rear end along the inner peripheral edge of the blade case 13. As shown in FIG. 4, the dust collection path 21 is partitioned from the other range (saw blade 12 side) of the blade case 13 by a partition wall portion 22 provided to face the inner periphery of the blade case 13. A dust collection port 21 a is provided at the front end of the dust collection path 21. The dust collection port 21 a is located above the cutting part C of the saw blade 12. 2 and 4, the saw blade 12 rotates in the counterclockwise direction (the direction indicated by the white arrow in FIG. 2). For this reason, the chips generated in the cutting part C due to the rotation of the saw blade 12 are wound up on the air flow (saw blade rotating wind) generated by the rotation of the saw blade 12. The wound chips are blown into the dust collecting passage 21 through the dust collecting port 21a as it rides on the flow of the saw blade rotating wind. The blown chips flow toward the rear side (counterclockwise direction) in the dust collecting path 21 together with the saw blade rotating wind.
Moreover, the other end side of the above-mentioned ventilation path 20 is opened to the side of the dust collection port 21a. For this reason, a part of the motor cooling air blown from the electric motor 11 into the motor mounting base portion 13a is blown out to the vicinity of the dust collection port 21a through the ventilation path 20. Here, on the downstream side of the dust collection port 21a, the branch plate 40 is provided substantially horizontally. The motor cooling air blown from the other end side of the air passage 20 is branched up and down by the branch plate 40. The motor cooling air branched upward is merged with the chips and saw blade rotating air blown from the dust collection port 21a, and the motor cooling air branched downward is from the front end of the blade case 13 to the front end of the base 2. It sprays toward the sumi guide part 2a provided. When a part of the motor cooling air is blown onto the smear wire guide portion 2a, it is possible to increase the visibility by blowing away the chips covering the smear wire guide portion 2a.
Furthermore, rectifying plates 21b and 21b are provided on both sides of the dust collection port 21a. The rectifying plates 21b and 21b rectify the saw blade rotating air blown into the dust collecting port 21a, and the chips generated thereby are efficiently blown into the dust collecting port 21a.
Further, an auxiliary dust collection port 21c is provided in the middle of the dust collection passage 21 and in the middle of the partition wall portion 22 so as to open to the saw blade 12 side. The auxiliary dust collecting port 21c is blown with chips and saw blade rotation air that have not been blown into the dust collecting port 21a.

The swarf and saw blade rotating air blown into the dust collecting passage 21 provided in the blade case 13 as described above flows through the dust collecting passage 21 toward the downstream side (the rear side of the blade case 13). Thereafter, it is blown into a cyclone type dust collector 51 provided on the front side of the blade case 13.
The cyclone type dust collector 51 includes an outer cylinder 52 and an inner cylinder 53. The outer cylinder 52 is connected to a side portion on the front side of the blade case 13. Further, as shown in FIG. 2, when viewed from the front side, the outer cylinder 52 is supported in a direction in which the axis is inclined in the vertical direction and the discharge port 52b is directed obliquely downward.
An exhaust port 21 d is provided at the leeward side end of the dust collection passage 21. The exhaust port 21 d protrudes from the front side of the blade case 13. On the other hand, a connection port 52 a is provided on the side of the outer cylinder 52. The connection port 52 a is provided at a position such that its axis does not intersect the central axis of the outer cylinder 52. The connection port 52a is airtightly connected to the exhaust port 21d, and the outer cylinder 52 is supported on the front side of the blade case 13.
An inner cylinder 53 is fixed on the inner peripheral side of the outer cylinder 52 along the central axis. As described above, the connection port 52 a is provided in a direction that does not intersect the central axis of the outer cylinder 52. For this reason, the saw blade rotating air blown from the exhaust port 21 d turns around the inner cylinder 53 along the inner wall surface of the outer cylinder 52.
Chips having a higher specific gravity are separated on the outer peripheral side (inner wall surface side of the outer cylinder 52) by the centrifugal force generated by the rotation of the saw blade and the cutting powder along the inner wall of the outer cylinder 52 (cyclone action). ). The swarf separated from the saw blade rotating air then falls to a discharge port 52b provided at the lower portion of the outer cylinder 52 by the action of gravity. Although illustration is omitted, the swarf falling on the discharge port 52b of the outer cylinder 52 can be directly received by a dust collection box or the like, or can be forcibly sucked by a separately prepared dust collector.

On the other hand, the saw blade rotating air blown into the outer cylinder 52 is exhausted to the outside of the outer cylinder 52 through an intake port 53 a provided at the lower end portion of the inner cylinder 53. The upper part of the inner cylinder 53 protrudes upward from the upper part (right end part in FIG. 1) of the outer cylinder 52. The upper part of the inner cylinder 53 protruding from the upper part of the outer cylinder 52 is communicated with one end side of the exhaust passage 55. The exhaust path 55 is provided along the side portion on the front side of the blade case 13. The other end side of the exhaust passage 55 is opened toward the smear line guide portion 2a provided at the front end portion of the base 2 at the front portion of the blade case 13 (blowout port 55a). For this reason, the saw blade rotating air exhausted through the inner cylinder 53 is blown to the sumi guide part 2a through the exhaust passage 55.
The saw blade rotating wind blown out from the blowout port 55a through the inner cylinder 53 is the air after the swarf is centrifuged by the cyclone type dust collector 51, so that the saw blade is blown out from the blowout port 55a. The chips are not mixed with the rotating wind. As described above, a part of the motor cooling air is branched by the branch plate 40 and blown out from the front end of the blade case 13 and blown to the smear wire guide portion 2a. In addition to this, since the exhaust from the cyclone type dust collector 51 is blown to the smear line guide part 2a, it is possible to more reliably blow off the chips accumulated on the smear line guide part 2a and to increase the visibility thereof. In this respect, not only the motor cooling air but also the exhaust of the dust collector 51 can be effectively utilized.

According to the cutting machine 1 of the present embodiment configured as described above, the swarf wound on the saw blade rotating wind generated along with the rotation of the saw blade 12 enters the dust collecting path 21 together with the saw blade rotating wind. Infused. In addition to the saw blade rotation air, the motor cooling air of the electric motor 11 is blown into the dust collection passage 21 through the air passage 20. For this reason, the chips generated at the cutting site C are blown into the dust collecting passage 21 with a stronger wind than in the case of only the saw blade rotating air generated immediately after the rotation of the saw blade 12. The generated chips can be efficiently collected in the dust collecting passage 21 with larger wind power.
The saw blade rotating wind and the chips blown into the dust collecting path 21 flow into a cyclone type dust collector 51 provided on the leeward side of the dust collecting path 21, and the chips are centrifuged by the cyclone type dust collector 51. . Thereby, dust generated at the cutting site C can be collected more reliably.
As described above, since the chips blown into the dust collecting passage 21 can be efficiently collected by the cyclone type dust collector, the dust collection due to the clogging when the cloth dust collecting bag is attached as in the prior art. It is possible to solve problems such as a reduction in dust efficiency or a high cost when a separately prepared forced dust collector is connected and a loss in portability of the cutting machine.
Moreover, the saw blade rotating air exhausted from the inner cylinder 53 of the dust collector 51 is circulated to the front end side of the blade case 13 and then blown to the smear wire guide portion 2a. Thus, since the saw blade rotating air exhausted from the dust collector 51 in addition to a part of the motor cooling air is blown to the smear wire guide portion 2a, the chips accumulated on the smear wire guide portion 2a are blown away or hardly accumulated. This can improve the visibility of the smear line guide portion 2a. Thus, according to the cutting machine of this embodiment, motor cooling air and exhaust of dust collector 51 can be used effectively.

Various modifications can be made to the embodiment described above. For example, in the dust collector 51, the connection port 52a of the outer cylinder 52 is connected to the exhaust port 21d so as to be rotatable within a certain range around the axis thereof, and between the inner cylinder 43 and the exhaust path 55, for example, a bellows tube or the like The outer cylinder 52 and thus the dust collector 51 can be provided so as to be rotatable around the axis of the exhaust port 21d within a certain range. According to such a configuration, since the inclination angle of the dust collector 51 can be changed, the centrifugal separation efficiency of the chips in the outer cylinder 52 can be adjusted, and as a result, the dust collector 51 can generate the dust collection capability. It can be set appropriately according to the size and specific gravity of the powder.
Furthermore, although the motor cooling air is circulated to the front end side of the blade case 13, a part thereof is blown into the dust collecting passage 21, and the remaining part is blown toward the sumi guide part 2a. Can be omitted. In this case, the air passage 20 and the branch plate 40 are not necessary.
Further, the swarf separated in the outer cylinder 52 of the dust collector 51 may be directly discharged from the discharge port 52b and collected in a separately prepared dust collection box or the like. In addition, it is possible to connect the hose of a separately prepared forced dust collector to the discharge port 52b of the outer cylinder 52 so as to forcibly collect the chips that have been centrifuged in the outer cylinder 52. is there.
Although not included in the invention as set forth in the appended claims, the saw blade the rotational wind from the front end portion of the blade case 13 the structure for blowing the corner line guide portion 2a outright been omitted flour exhausted from the inner cylinder 55 It is good also as a structure which exhausts the saw blade rotary wind from which this was removed directly from the inner cylinder 53 to the atmosphere.

It is a schematic top view of the portable circular saw machine provided with the dust collector which concerns on embodiment of this invention. It is a front view of the portable circular saw machine provided with the dust collector which concerns on embodiment of this invention. It is a top view of the portable circular saw machine provided with the dust collector which concerns on embodiment of this invention. It is a longitudinal cross-sectional view of the portable circular saw machine provided with the dust collector which concerns on embodiment of this invention. In this figure, the blade case is shown in a longitudinal section. It is a cross-sectional view of a portable circular saw machine equipped with a dust collector according to an embodiment of the present invention. It is a perspective view of the portable circular saw machine provided with the dust collector which concerns on embodiment of this invention. This figure has shown the state which looked at the back side from the cutting progress direction diagonally left front side.

Explanation of symbols

1 ... Cutting machine (portable circular saw)
DESCRIPTION OF SYMBOLS 2 ... Base, 2a ... Sumi wire guide part 10 ... Cutting machine main body 11 ... Electric motor 12 ... Saw blade 13 ... Blade case, 13a ... Motor mounting base part 14 ... Cooling fan 16 ... Cooling air intake 18 ... Cooling air outlet 20 ... Ventilation path 21 ... Dust collection path 21a ... Dust collection port, 21d ... Exhaust port 25 ... Safety cover 26 ... Depth guide 30 ... Front side angular plate 35 ... Rear side angular plate 40 ... Branch plate 45 ... Handle part 51 ... Dust collector 52 ... outer cylinder, 52a ... connection port, 52b ... discharge port 53 ... inner cylinder, 53a ... intake port 55 ... exhaust path, 55a ... outlet port C ... cutting site

Claims (1)

A base mounted on a cutting material; a cutting machine body supported on an upper surface of the base; the cutting machine body including a saw blade rotated by an electric motor; and a blade case covering the periphery of the saw blade; A cutting machine in which cutting powder is wound up in the blade case by mixing with the saw blade rotating wind generated by the rotation of the saw blade,
A cyclonic dust collector is provided on the leeward side of the blade case ,
The dust collector includes an outer cylinder and an inner cylinder inside the outer cylinder, and the outer cylinder is connected to an exhaust port provided on the leeward side of the blade case ,
The saw blade rotating air exhausted from the inner cylinder is circulated to the windward side of the blade case through the exhaust passage and blown to the smear wire guide provided at the front end of the base in the cutting direction. Cutting machine configured.

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