JP2001062803A - Circular saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an amount of chips scattered on an operator side through a peep window by providing a scattering direction-changing means for the chips so that the chips do not scatter to the operator side of the peep window. SOLUTION: When a material W to be cut approches an end of cutting, chips are scattered above a base 12 through a peep window 24. A part of the chips having passed through the peep window 24 hits a repulsing piece 22b of a first repulsing component 22 covering a partial upside of the peep window 24, and comes to fly downward by changing its scattering direction. Further, the chips spring back by hitting on an inner edge in a saw blade cutting direction of the peep window 24, hit on a repulsing face 26s of a second repulsing component 26, and come to fly downward by changing the scattering direction. Therefore, for the chips flying toward the peep window 24, their scattering direction is changed by the first repulsing component 22 and the second repulsing component 26, and they can be prevented from scattering to the operator side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular saw machine, and more particularly to a circular saw machine for cutting a material to be cut by protruding a saw blade rotating below a base. The present invention relates to a circular saw provided.

[0002]

2. Description of the Related Art An example of a conventional circular saw is Japanese Utility Model Publication No. 61-40.
No. 481. In this circular saw machine, a part of a saw blade that is rotationally driven by a motor or the like protrudes below the base, and the material to be cut below the base is cut by the protruding saw blade. When cutting a material to be cut by such a circular saw, the material to be cut cannot be cut accurately without any additional configuration because the material to be cut is below the base. For this reason, in such a circular saw machine, a viewing window for aligning the ink line is formed on the base, and a mark for aligning the ink line is formed in the viewing window. And
When cutting the material to be cut with the above-mentioned circular saw machine, first, a black line is drawn on the material to be cut, and the black line is aligned with a mark for aligning the black line of the viewing window to cut the material to be cut.

[0003]

When the material to be cut is cut in the above-mentioned conventional circular saw machine, the cutout is generated from the saw blade at the beginning of the cutting of the material to be cut because the viewing window is closed by the material to be cut. Chips do not fly above the base through the viewing window, but near the end of cutting the material to be cut, one of the chips generated from the saw blade is not blocked by the viewing window. In some cases, the part flew above the base through the viewing window. Then, there is a problem that a part of the chips flying above the base through the viewing window rebounds on the inner edge of the viewing window or the like and scatters to the operator side. Therefore, an object of the present invention is to provide a circular saw capable of reducing the amount of chips scattered to a worker through a viewing window.

[0004]

A circular saw machine according to the present invention is a circular saw machine for cutting a material to be cut by a saw blade protruding downward from a base, wherein the base has a viewing window for black line alignment. A scattering direction changing means for changing the scattering direction of the chips so that the chips are not scattered to the operator side is provided in the viewing window. In such a circular saw, chips flying toward the viewing window from the saw blade are scattered by the scattering direction changing means provided in the viewing window so that the chips do not fly to the operator side. Is changed. Therefore, according to the circular saw of the present invention, it is possible to reduce the amount of chips scattered to the operator side through the viewing window.

Here, the scattering direction changing means provided on the viewing window includes not only a case where the scattering direction changing means is provided on the viewing window itself but also a case where it is provided near the periphery of the viewing window. As a device provided with means for changing the scattering direction of chips near the periphery of the viewing window, there is, for example, a circular saw according to claim 2. In the circular saw according to claim 2, the scattering direction changing means includes a first shielding member provided on at least a part of a periphery of the viewing window. Here, the shielding member refers to a member provided on the flight trajectory of the swarf flying from the saw blade and blocking the whereabouts of the swarf flying. Therefore, it may be provided at any position as long as it can be arranged on the flight trajectory of the chips. However, in such a circular saw machine, an operator stands behind the saw blade and looks through the viewing window from behind the saw blade.
Look at the ink line drawn on the material to be cut. For this reason, in consideration of the visibility of the operator when viewing the black line, the location where the first shielding member is provided is preferably the periphery of the viewing window on the cutting direction side of the saw blade. Further, it is preferable that the first shielding member has a rebound surface (a surface on which the chips are applied) projecting above the viewing window within a range that does not impair the visibility of the viewing window for the operator. For example, if a repelling surface that protrudes above the view window at a position where the shielding member is vertically separated from the base by a predetermined distance is provided, more chips are repelled to the repelling surface without impairing the visibility of the operator. And the direction of its scattering can be changed. Also,
It is preferable that the repelling surface of the first shielding member be a repelling surface such that chips hitting the repelling surface of the first shielding member fly downward. With this configuration, the chips that have hit the first shielding member fly toward the ground or the like, and the chips do not scatter around.

A circular saw according to a third aspect of the present invention is provided with means for changing the direction in which chips are scattered in the viewing window itself. In the circular saw machine according to claim 3, the scattering direction changing means includes changing a scattering direction of the swarf by inclining at least a part of an inner edge of the viewing window on a saw blade cutting direction side. It is characterized by the following.
In the circular saw according to the third aspect, a part of the chips flying from the saw blade rebounds when hitting the inside edge of the viewing window in the saw blade cutting direction, but since the inner edge is inclined, the rebound direction of the chip changes. As a result, the amount of chips scattered to the worker can be reduced. Here, the saw blade cutting direction refers to the direction in which the saw blade moves (the circular saw machine moves) when cutting the material to be cut by the circular saw machine. It should be noted that the scattering direction changing means may be provided with both of the above-described structure of inclining the shielding member and the inside edge of the viewing window.

The shielding member for preventing the swarf from scattering to the operator can be provided at a position other than the periphery of the viewing window. For example, chips flying from the saw blade and scattered above the base are classified into those that pass through the viewing window as it is and those that bounce off the inner edge of the viewing window. Many of those that hit the inner edge of the viewing window rebound toward the saw blade cover and often hit the saw blade cover. Therefore, it is also effective to provide the above-mentioned shielding member on the saw blade cover. The circular saw according to claim 4 of the present invention is a circular saw that cuts a material to be cut by a saw blade projecting downward from a base, wherein the base is provided with a viewing window for black line alignment, A saw blade cover that covers the saw blade protruding above the base is provided, and the saw blade cover is provided with a second shielding member that changes the direction of chips scattered from the saw blade. . According to the circular saw according to the fourth aspect, the chips that mainly hit the inner edge of the viewing window on the saw blade cutting direction side and fly above the base hit the second shielding member. Since the direction of the swarf that has hit the second shielding member is changed, the amount of the swarf scattered toward the worker can be reduced. Here, as the shape of the second shielding member, a rebound surface protruding forward (saw blade cutting direction) from the saw blade cover may be formed within a range that does not impair visibility of the view window of the operator. preferable. By employing such a configuration, more chips can be applied to the second shielding member to change the scattering direction. In addition, it is preferable that the repelling surface of the second shielding member be formed with a repelling surface such that chips hitting the second shielding member fly downward. The same is true. Note that the scattering direction changing means may be provided in the viewing window, and the above-mentioned second shielding member may be provided in the saw blade cover. In this way, the amount of chips scattered to the worker can be further reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A circular saw according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a circular saw according to an embodiment of the present invention, FIG. 2 is a side view in which a part of the circular saw shown in FIG. 1 is cut away, and FIG. 3 is an enlarged view showing a part of a viewing window 24 of a circular saw. As shown in FIGS. 1 and 2, a circular saw according to the present invention includes a main body 10 having a motor, a saw blade, and the like, and a lower side of the main body 10. It has a base 12 that abuts against the outer surface.

The base 12 is formed of a substantially rectangular flat plate as shown in FIG. 1, and has a saw blade projecting groove (not shown) for projecting the saw blade 32 below the base. Also base 12
A viewing window 24 is formed in front of the saw blade 32 (saw blade cutting direction). The viewing window 24 is provided with a black mark 18 on a side opposite to the saw blade cutting direction, and a first rebound member 22 is provided on the saw blade cutting direction side. The first rebound member 22
As shown in FIG. 1, a fixing piece 22a having a width larger than the width of the viewing window 24 and being fixed to the base 12 as shown in FIGS.
And a bounce piece 22b which is bent from the fixed piece 22a and is separated from the view window 24 by a predetermined distance and covers a part of the view window 24. The splash piece 22b is inclined upward with respect to the base 12 so that the worker who is obliquely behind the circular saw machine sees the black line drawn on the workpiece from above the viewing window 24 so that the splash piece 22b does not interfere. While being formed,
The extent (area) of covering the viewing window 24 is adjusted (Fig. 3
reference). Also, the rebound surface 22s formed on the surface on the back side of the rebound piece 22b is such that chips hitting this surface fly downward. A black line mark 20 for black line alignment is formed on the outer periphery of the base 12 in the saw blade cutting direction.

A mounting portion 17 is fixed to the base 12, and a hinge portion 16 provided on the main body 10 is hinged to the mounting portion 17, and the main body 10 is assembled to the base 12. A motor housing 11 is disposed on the main body 10 so as to protrude from the center of the base 12 to the side as shown in FIG.
A saw blade 32 is provided at a position facing the motor housing 11. A motor is housed in the motor housing 11, and the motor is connected to the saw blade 32 via a speed reducer (not shown), and the saw blade 32 is driven to rotate by the motor. A substantially upper half of the saw blade 32 is covered by a fixed saw blade cover 28 provided on the main body 10 as shown in FIG. The fixed saw blade cover 28 also has a function of a dust box for storing the chips generated by the cutting operation and flying inside the fixed saw blade cover 28, and removes the chips stored in the fixed saw blade cover 28. A discharge hole 30 for discharging is provided. A second rebound member 26 is provided on the fixed saw blade cover 28 in the saw blade cutting direction. The second rebound member 26 is provided over the entire width of the fixed saw blade cover 28 as shown in FIG. The second rebound member 26 projects from the fixed saw blade cover 28 by a predetermined length in the saw blade cutting direction as shown in FIG. The length of the second rebound member 26 protruding from the fixed saw blade cover 28 is such that the visibility of the view window of the operator is not impaired. That is, the second rebound member 26 is projected so that the worker can visually recognize the black line mark 18 of the viewing window 24 provided on the base 12.
In the present embodiment, when the viewing window 24 is viewed from directly above,
The black line mark 18 and the second rebound member 26 are set to such an extent that they hardly overlap. Further, as shown in FIG. 2, the second spring member 26 has a spring surface 26s inclined obliquely upward with respect to the fixed saw blade cover 28. The repelling surface 26s is formed in such a direction as to hit the inner edge of the viewing window 24 on the cutting direction side and repel the chips protruding above the base 12 downward.

As shown in FIG. 2, a substantially lower half of the saw blade 32 projects below the base 12 from a saw blade protruding groove provided in the base 12. The saw blade 32 protruding below the base 12
Is covered by a movable saw blade cover 34 provided at a lower portion of the main body 10. The movable saw blade cover 34 is
The saw blade 32 is provided to be rotatable with respect to the cover, covers a substantially lower half of the saw blade 32 projecting below the base 12 when the saw blade 32 is not used without rotating the saw blade 32, and rotates when the saw blade 32 is in use.
And the saw blade 32 is exposed.

A handle portion 14 is formed substantially in the center of the main body 10 in parallel with the cutting direction. The handle portion 14 is provided with a switch and the like for turning on the power of a motor (not shown). A battery unit (not shown) is provided at the rear of the handle unit 14.

Next, the operation of the above-described circular saw for cutting a workpiece will be described. Here, as the material to be cut, an L-shaped angle material (metalwork) shown in FIG. 2 is used.
An example in which the material to be cut is cut will be described. First, an operator grasps the handle portion 14 of the circular saw machine, brings the bottom surface of the base 12 into contact with the workpiece W as shown in FIG. Two black lines 18 and 2
Adjust the position of the circular saw so that it is 0. At this time, since the shapes and the like of the first spring member 22 and the second spring member 26 are adjusted as described above, the operator can easily see the black line drawn on the workpiece W from the viewing window 24. In addition, the black line can be easily adjusted. Next, by turning on a switch provided on the handle portion 14, the motor is turned on, and the saw blade 32 is rotated. Thereafter, the hand gripping the handle portion 14 is moved while the black line drawn on the workpiece W is aligned with the black line marks 18 and 20 provided on the base 12, and the workpiece W is moved.
Perform cutting work. While the workpiece W is visible through the viewing window 24, the chips flying in the direction of the viewing window 24 from the saw blade 32 hit the workpiece W and do not fly out above the base 12. However, when the workpiece W approaches the end of cutting (the state shown in FIG. 2), since the workpiece W does not block the viewing window 24, chips generated by the saw blade 32 pass through the viewing window 24 and pass through the base 12. Will scatter above.

At this time, a part of the swarf that has passed through the viewing window 24 hits a rebound piece 22b of the first rebound member 22 that covers a part of the viewing window 24 as shown by a flight trajectory S in FIG. The direction of the scattering changes and it flies downward. In addition, the swarf that has hit the inner edge of the viewing window 24 in the saw blade cutting direction hits the rebound surface 26s of the second rebound member 26 as shown by the flight trajectory t in FIG. It will be. Therefore, the swarf that flew toward the viewing window 24 is the first rebound member 2
The scatter direction is changed by the second and second rebound members 26 to prevent scatter to the operator side.

As described above, in the circular saw according to the above-described embodiment, the direction in which the chips are scattered is changed by the first rebound member 22 and the second rebound member 26, and the swarf which is scattered to the operator side is changed. The amount can be reduced. Further, in the circular saw according to the above-described embodiment, since the spring piece 22b of the first spring member 22 is projected above the viewing window 24,
Chips that pass through the viewing window 24 without hitting the inner edge of the viewing window 24 can also be bounced downwards by hitting the pieces 22b. For example, if there is no bounce piece 22b, when there is a building in front of the circular saw machine, chips passing through the sight glass 24 may hit the building and scatter to the rebound operator side. In the embodiment, such a problem does not occur because the splash direction is changed by the rebound piece 22b. Further, since the size and shape of the first spring member 22 and the second spring member 26 are such that the worker can easily see the black line drawn on the workpiece W from the viewing window 24, There is no disadvantage in black line alignment due to the first rebound member 22 and the second rebound member 26.

The first rebound member 22 and the second
If the rebound member 26 is formed using a transparent resin material or the like, the operator can more easily see the black line drawn on the material to be cut from the viewing window 24. Also, the first rebound member 22
The shape and dimensions of the second rebound member 26 are not limited to those of the above-described embodiment. For example, the first rebound member may be configured as shown in FIG. Here, FIG. 4A is an enlarged plan view showing the viewing window 24 and the first rebound member 40, and FIG. 4B is a front view of FIG. 4A. As shown in FIG. 4, in this example, the first rebound member 40 does not project over the viewing window 24, and the rebound surface 40 s is perpendicular to the base 12, and also in the saw blade cutting direction. Tilted. And
By making the angle of inclination such that the chips are not scattered to the worker side (for example, the chips that have flown as shown by the dotted arrow in FIG. 4A are repelled by the repulsion surface 40s), It is possible to prevent chips from scattering to the operator side.

Next, a circular saw according to another embodiment of the present invention will be described with reference to FIG. FIG. 5 is a plan view of a circular saw according to another embodiment of the present invention.

The circular saw shown in FIG. 5 also includes a main body 10 having a motor, a saw blade, and the like, and a base arranged below the main body 10.
The point provided with 12 and the structure of the main body 10 are the same as those of the circular saw shown in FIGS. 1 and 2. However, FIG.
In the circular saw shown in FIG. 5, the first rebound member 22 and the second rebound member 26 are used to reduce the amount of chips scattered to the operator side, whereas in the circular saw shown in FIG. The difference is that the amount of chips scattered to the operator side is reduced by inclining the inner edge of the window 24 in the saw blade cutting direction.

More specifically, in the circular saw shown in FIG. 5, the inner edge 25 of the viewing window 24 on the cutting direction side is inclined, and chips rebounding from the inner edge 25 are repelled to the right rear of the circular saw (left in FIG. 5). (Diagonally downward). That is, since there are generally many right-handed workers, it is considered that the worker often works by gripping the handle portion 14 with the right hand. Therefore, it is considered that the operator often works on the left rear side of the circular saw machine (the upper left direction in FIG. 5). Therefore, if the inner edge 25 of the viewing window 24 in the cutting direction is inclined as shown in FIG.
In this case, the swarf that bounces off as shown in the flight trajectory u in FIG. 5 can be prevented from flying to the operator side (left rear of the circular saw). In addition, when such a configuration is adopted, only the shape of the viewing window 24 needs to be changed as compared with the case shown in FIGS. Note that, in the circular saw shown in FIGS.
Played a role mainly in changing the scattering direction of the swarf that hit the inner edge 25 of the viewing window 24. Therefore, in the circular saw shown in FIGS. 1 and 2 described above, if the configuration in which the inner edge of the viewing window 24 is inclined as in the circular saw shown in FIG. it can.

Although some embodiments of the present invention have been described in detail above, these are merely examples, and the present invention may be implemented in various modified and improved forms based on the knowledge of those skilled in the art. Can be.

[Brief description of the drawings]

FIG. 1 is a plan view of a circular saw according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view of the circular saw of FIG. 1;

FIG. 3 is a partially enlarged view of the circular saw shown in FIGS.

FIG. 4 is a drawing showing another example of the first rebound member.

FIG. 5 is a plan view of a circular saw according to another embodiment of the present invention.

[Explanation of symbols]

 10. Body 11 Motor housing 22 First spring member 24 Viewing window 25 Inner edge 26 Second spring member

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hideki Abe 3-11-8 Sumiyoshicho, Anjo City, Aichi Prefecture Makita Incorporated (72) Inventor Takayoshi Yoshimura 3-11-8 Sumiyoshicho, Anjo City, Aichi Prefecture Stock Company Makita

Claims (4)

[Claims] 1. A circular saw machine for cutting a material to be cut by a saw blade protruding downward from a base, wherein the base is provided with a viewing window for aligning a black line, and the viewing window is cut to an operator side. A circular saw machine provided with a scattering direction changing means for changing a scattering direction of chips so that the powder is not scattered. 2. The circular saw according to claim 1, wherein the scattering direction changing means includes a first shielding member provided on at least a part of a periphery of the viewing window. 3. The scattering direction changing means includes changing a scattering direction of chips by inclining at least a part of an inner edge of the viewing window on a saw blade cutting direction side. Item 4. The circular saw according to Item 1. 4. A circular saw machine for cutting a material to be cut by a saw blade protruding below a base, wherein the base is provided with a viewing window for black line alignment, and the saw blade protruding above the base is provided. A circular saw machine comprising: a saw blade cover for covering; and a second shielding member for changing a direction of chips scattered from the saw blade on the saw blade cover.