JP2003080418A - Portable electric cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable electric cutting tool favorable in workability capable of easily carrying out work to adjust a beam to either one of side surfaces of a knife edge part. SOLUTION: In this electric cutter having a main body with an electric motor built in it, a saw blade 2 held on the main body and driven to be free to revolve by the electric motor serving as its motive power, a saw cover 3 provided on the main body and formed in a shape to cover a part of the saw blade 2, a base 1 mounted on the main body, having an opening part free to project a part of the saw blade downward and free to slide on an upper surface of a material to be cut 6 at the time of cutting work, and a beam irradiation device 4 free to apply the beam on an extension in the cutting direction of the saw blade 2, the beam irradiation device 4 is disposed in the rear in the cutting direction of the tangential direction H with respect to an intersection point G where an outer periphery of the saw blade 2 and a bottom surface of the base 1 cross with each other, the beam 5 can be applied to the rear in the cutting direction of the intersection point G, and the beam irradiation device 5 is made free to move in parallel in the direction of the axis of rotation of the saw blade 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable cutting tool equipped with a light irradiation device. Hereinafter, the portable cutting tool will be described taking a portable electric circular saw as an example.

[0002]

2. Description of the Related Art A method for an operator to perform accurate cutting work with a portable cutting tool is to draw a marking line 13 on a material 6 to be cut as shown in FIG. There is a method of cutting while arranging one of the side surfaces 12a and 12b of the blade edge portion 2a of No. 2 as shown in FIG. 5 (a), and one side surface 12a (main body side) of the blade edge portion 2a is marked with the marking line 1.
Method of cutting along 3 or Fig. 5 (b)
As shown in FIG. 2, the worker performs the cutting work according to the two working methods of cutting the other side surface 12b (opposite the main body side) of the cutting edge portion 2a along the marking line 13.

As described above, the laser oscillator is designed so that the cutting work along the marking line 13 can be performed with high accuracy, and the work for properly using the cutting method can be performed with high accuracy as described above. An on-board portable electric circular saw is disclosed in US Pat. No. 5,375,495.

As shown in FIG. 6, the portable electric circular saw has the following structure.
Tangent line H of intersection G where the outer periphery of saw blade 2 and the bottom surface of base 1 intersect
The laser oscillator 4 is arranged in front of the saw blade 2 so that the laser beam 5 is irradiated toward the saw blade 2 so that the laser beam 5 can contact the saw blade 2. The laser oscillator 4 is provided so as to be movable in parallel to the rotation axis direction of the saw blade 2 so that the laser beam can be irradiated along either one of the side surfaces 12a and 12b of the portion 2a.

FIG. 7 is a sectional view taken along the line EE of FIG. 6, showing a line 11 appearing on the material 6 to be cut by irradiating the saw blade 2 and the laser beam 5 in the vicinity of the cutting edge portion 2a of the saw blade 2. It shows the relationship with. FIG. 7A shows a state in which the position in the rotation axis direction of the saw blade 2 of the laser oscillator 4 is set so that the line 11 is along one side surface 12a of the blade edge portion of the saw blade 2, and FIG. Shows a state in which the position of the laser oscillator 4 is set such that the line 11 is along the other side surface 12b of the cutting edge portion of the saw blade 2, and FIGS. 7 (b) to 7 (c) show FIG.
The laser oscillator 4 is moved in parallel from the state of FIG.
An intermediate state in which the state (e) is reached is shown.

The operation of irradiating either one of the side surfaces 12a and 12b of the blade tip portion 2a of the saw blade 2 with the laser beam 5 is as shown in FIG. 6 and FIG. It is performed in a state in which the blade tip portion 2a of the saw blade 2 is abutted against.

[0007]

In order to perform an accurate cutting operation, as shown in FIGS. 5 (a) and 5 (b), the marking line 13 drawn on the material 6 to be cut is provided with the cutting edge portion 2a. Although the cutting is performed along one of the side surfaces 12a and 12b, in the conventional portable electric circular saw that employs the laser oscillator 4 as described above, the laser beam 4 irradiates the material 6 to be cut. As shown in FIGS. 7 (a) and 7 (e), the line 11 to be cut is formed by the side surfaces 12a and 12b of the cutting edge portion 2a.
It is important to perform the cutting work in the state where

However, in the above-mentioned conventional portable electric circular saw, the laser oscillator 4 is arranged in front of the tangent line H of the intersection G where the outer periphery of the saw blade 2 and the bottom surface of the base 1 intersect, and the laser beam 5 emits the saw blade. It is configured to irradiate toward the saw blade 2 side so as to be able to contact the laser beam 2, and when the laser beam 5 is aligned with either side surface 12a, 12b of the blade tip portion 2a, the laser oscillator 4 While performing the parallel movement adjustment, the relationship between the cutting edge portion 2a and the line 11 irradiated on the material 6 to be cut near the end face 6a must be performed by directly visually observing the cutting edge portion 2a. The saw blade 2 must be rotated so that the relationship between the line 11 and the cutting edge portion 2a can be grasped in a state where the cutting edge 2a is not in contact with the end surface near the upper surface of the material 6 to be cut. Side 12a of the cutting edge 2a, 12
There is a drawback that the work of aligning the line 11 with b cannot be easily performed.

A saw blade 2 generally used in a portable electric circular saw has a shape in which two types of blade tips 2a are alternately arranged, as shown in FIGS. When the cutting operation is performed using the saw blade 2 of this type, the width dimension at which the material 6 to be cut is cut is the width D shown in FIG. 9, and the side surfaces 12a and 12b of the cutting edge portion 2a described above are Each becomes a protruding part. When this type of saw blade 2 is adopted in the above-mentioned conventional portable electric circular saw and the line 11 is aligned with the side surfaces 12a and 12b of the blade tip 2a as described above, the rotational position of the saw blade 2 is increased. Since the shape of the cutting edge portion 2a that abuts the end surface 6a of the cutting material 6 in the vicinity of the upper surface of the cutting material 6 differs depending on whether the saw blade 2 is in the proper rotational position, either One side 12
a, 12b and the line 11 cannot be aligned, and the line 1 is formed on the side surfaces 12a, 12b of the cutting edge portion 2a.
It was very difficult to combine 1's.

Further, the side surface 12b of the cutting edge portion 2a opposite to the main body side.
As for the work of aligning the line 11 with the cutting edge part 2 from the rear side in the cutting direction, the side surface side of the saw blade 2 is open.
Although it is possible to visually check the relationship between a and the line 11, the work of aligning the line 11 with the side surface 12a on the main body side is the rear side in the cutting direction because the main body side surface of the saw blade 2 is closed. Therefore, it is relatively difficult to visually check the relationship between the cutting edge portion 2a and the line 11.

An object of the present invention is to solve the above-mentioned drawbacks and to provide a portable electric cutting tool which has a good workability and which can easily perform the work of aligning a light beam on either side of the blade tip of a saw blade. It is to be.

[0012]

The above object is to arrange the light beam irradiation device rearward in the cutting direction with respect to the tangential direction with respect to the intersection where the outer periphery of the saw blade and the base bottom surface intersect, and to cause the light beam to be rearward with respect to the intersection point in the cutting direction. Can be irradiated, and the light beam irradiation device can be moved in parallel to the rotation axis direction of the saw blade.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a portable electric circular saw according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, a portable electric circular saw has a main body containing an electric motor (not shown), a saw blade 2 rotatably held by the main body, and rotationally driven by the electric motor, and the main body. A saw cover 3 having a shape to cover a part of the saw blade 2 and an opening (not shown) attached to the main body and capable of projecting a part of the saw blade 2 downward. 6 comprises a base 1 slidable on the upper surface, and a laser oscillator 4 which is a light beam irradiation device capable of irradiating a laser beam 5 on an extension of the saw blade 2 in the cutting direction.

The laser oscillator 4 is mounted on the saw cover 3, and the laser beam 5 oscillated by the laser oscillator 4 is provided around the saw cover 3 near the laser oscillator 4.
3a within the irradiation range of the laser beam and through which the laser beam 5 can pass
Is provided. Therefore, as shown in FIG. 1, the laser beam 5 oscillated by the laser oscillator 4 is capable of irradiating the front end of the base 1 in the cutting direction and the material 6 to be cut on the front side in the cutting direction with respect to the end of the base 1. The laser beam 5 that has passed through the inside of the saw cover 3 through the hole 3a of the saw cover 3 is cut by the saw blade 2 (the outer periphery of the saw blade 2 and the base 1).
Irradiation is performed on the material 6 to be cut near the intersection G) where the bottom surface intersects. Reference numeral 7 in FIG. 2 is a line that appears when the material 6 to be cut is irradiated with the laser beam 4.

Further, as shown in FIG. 1, the laser oscillator 4 is arranged behind a tangent line H to an intersection point G where the outer periphery of the saw blade 2 and the bottom surface of the base 1 intersect with each other in the cutting direction.

The laser beam 5 oscillated from the laser oscillator 4 can irradiate the rear side in the cutting direction from the intersection G which is the cutting portion of the saw blade 2 as shown in FIGS. At the same time, it is set so as to extend in parallel with the longitudinal direction of the saw blade 2. Further, as shown in FIG. 3, there is provided an adjusting mechanism for moving the laser oscillator 4 in parallel so that the laser beam 5 can move in parallel with the rotation axis direction of the saw blade 2, whereby the cutting edge portion 2a of the saw blade 2 is provided. The operation of aligning the laser beam 4 with one of the side surfaces 12a and 12b can be selectively performed. That is, in the state shown in FIG. 2, the line 1 appearing on the material 6 to be cut.
1 is one side surface 12a (body side) of the cutting edge portion 2a of the saw blade 2.
The laser beam 5 is in a state of being combined with the one side surface 12a, but it is possible to match the laser beam 5 with the other side surface 12b (opposite the main body side) by moving the laser beam 5 in parallel. .

Next, an adjusting mechanism for moving the laser oscillator 4 in parallel will be described with reference to FIG.

In the state shown in the drawing, the portion C of the laser beam oscillator 4 which oscillates the laser beam 5 is one side surface 12a of the saw blade 2.
It is located in the (main body side). Laser beam oscillator 4
Is fixed to the moving member 20 via a mounting portion 4a as shown in the figure. The moving member 20 includes a laser beam oscillator 5
A screw hole 20a and a hole 20b are provided at positions sandwiching. The bolt 21 inserted into the through hole 22a of the fixing member 22 fixed to the saw cover 3 is screwed into the screw hole 20a of the moving member 20, and the moving member 20 and the fixing member 22 have a space between them. Springs 23 and 24 are arranged, and the moving member 20 is always biased in a direction away from the fixed member 22. Further, the pin 25 is press-fitted into the through hole 22b of the fixed member 22, and the pin 25 is arranged in the through hole 20b so that the moving member 20 can slide on the pin 25.

With the above-described structure, when the bolt 21 is rotated in the direction in which the bolt 21 is tightened with respect to the screw hole 20a of the moving member 20, the bolt 21 side of the moving member 20 receives the urging force of the spring 23. Against fixing member 2
Move toward 0. Along with this, the moving member 20
The pin 25 side moves toward the fixed member 22 due to the engagement of the pin 25 and the through hole 20b, and the moving member 20 moves in parallel with the axial direction of the bolt 21 and the pin 25. Further, the bolts 21 are screw holes 20a of the moving member 20.
When the bolt 21 is rotated in a loosening direction, the bolt 21 side of the moving member 20 moves in a direction away from the fixed member 20, and accordingly, the pin 25 side of the moving member 20 is urged by the spring 24. It moves in a direction away from the fixed member 20. The bolt 21 and the pin 25 are provided so that the axial direction thereof coincides with the rotation axis direction of the saw blade 1, and thus the laser beam 5 is translated in the rotation axis direction of the saw blade 2. That is, since the irradiation position of the laser beam 5 can be moved in parallel to the rotation axis direction of the saw blade 2 by rotating the bolt 21, the laser beam 5 can be moved to either of the blade tip portions 2a of the saw blade 2 depending on the working situation. One side 1
2a, 12b can be adjusted. Note that FIG.
In the state shown in, the part C that oscillates the laser beam 4 is the cutting edge part 2.
Although it is in a state of fitting to the one side surface 12a of a, if the bolt 21 is rotated in the direction in which the screw fitting of the bolt 21 and the screw hole 20a is loosened from this state, the irradiation position of the laser beam 4 is changed to the saw blade. It can be fitted to the central part of 1 or the other side surface. Further, the spring 23 is provided for the purpose of preventing the laser beam oscillation device 5 from vibrating due to a slight gap existing in the screw portion between the bolt 21 and the screw hole 20a.

A state in which the mechanism for moving the laser oscillator 4 in parallel as described above is operated will be described with reference to the relationship between the saw blade 2 and the line 11 appearing on the workpiece 6 shown in FIG. In addition, in FIG. 4, the saw blade 2 is cut into the material 6 to be cut before the cutting work is started.
By contacting the end face 6a of the blade 2a and moving the laser oscillator 4 in parallel.
The operation of adjusting the laser beam 5 to 12b is shown.

FIG. 4A shows one side surface 1 of the cutting edge portion 2a.
Line 11 is fitted to 2a, and one side surface 1 of blade tip 2a
2a shows a state in which the laser beam 5 is combined with FIG.
(E) shows a state in which the line 11 is fitted to the other side surface 12b of the cutting edge portion 2a, and FIGS. 4 (b) to 4 (d) show the state of FIG. 4 (a) to the state of FIG. 4 (e). It shows an intermediate state in which the laser oscillator 4 is translated so that

As shown in FIG. 4 (a), the line 11 is fitted to one side surface 12a of the cutting edge portion 2a and the laser beam 5 is matched to one side surface 12a of the cutting edge portion 2a. To align with the other side surface 12b of the above, the bolt 21 shown in FIG. 3 is operated by rotating the bolt 21 and the screw hole 20a of the moving member 20 in a direction in which the screw fitting is tightened. The line 11 is shown in FIG. 4 according to the parallel movement of the laser oscillator 4.
During the parallel movement from the state shown in FIG. 4A to the state shown in FIG. 4E, as shown in FIG. 4B to FIG. 11 will disappear. This is because when the portion C of the laser oscillator 4 that oscillates the laser beam 5 is located on the saw blade 2 and the laser beam 5 is in contact with the saw blade 2, the laser beam 5 is as shown in FIG.
This is because the laser beam 5 is blocked by the saw blade 2 on the rear side in the cutting direction from the point K where the outer edge of the saw blade 2 intersects with the outer edge of the saw blade 2, and the tangent to the intersection point G where the outer periphery of the saw blade 2 and the bottom surface of the base 1 intersect. The laser oscillator 4 is disposed rearward of the cutting direction with respect to H, the laser beam 5 can irradiate the rear side of the intersection G with respect to the cutting direction, and the laser oscillator 4 can be moved in parallel with the rotational axis direction of the saw blade 2. This can be achieved by

In the state shown in FIGS. 4 (b) to 4 (d), the part where the line 11 disappears is caused by the laser beam 5 being interrupted by a plurality of cutting edge portions 2a located above the intersection point G. And for this reason line 11
Indicates that the laser beam 5 is located within the width dimension D of the blade edge portion 2a.

Therefore, in the portable electric circular saw of the present invention, the laser beam 5 is applied to either side surface 12a, 12 of the cutting edge portion 2a.
When adjusting to b, the laser oscillator 4 may be moved in parallel while confirming whether or not the line 11 disappears within the range of the dimension L, and the laser beam 5 and the cutting edge portion 2a can be easily moved.
Since it is possible to grasp whether or not one of the side surfaces 12a and 12b is in contact with each other, it is possible to easily perform the above-mentioned alignment work. Further, even if the relationship between the cutting edge portion 2a and the line 11 is not grasped by directly visually observing the cutting edge portion 2a, it is only necessary to confirm the state of the line 11 (whether or not part of the line disappears) and the laser beam 5 and the cutting edge. The relationship with the portion 2a can be easily grasped, and even if the rotational position of the saw blade 2 is not at the rotational position where the blade tip 2a is located in the vicinity of the line 11, the laser beam 5 falls within the width D of the blade tip 2a. You can easily grasp whether it is in a position,
The laser beam 5 is not limited to the rotational position of the saw blade 2 when the laser beam 5 is aligned with the side surfaces 12a and 12b of the blade tip 2a, and the alignment operation can be easily performed.

Even in the case of the saw blade 2 in which the blade tips 2a having different shapes are alternately arranged as shown in FIGS. 8 and 9, the laser beam 5 is blocked by the plurality of blade tips 2a as described above. By doing so, the line 11 disappears when the laser beam 5 is positioned within the width D of the cutting edge portion 2a, so that the above alignment work can be easily performed.

Further, since the relationship between the laser beam 5 and the cutting edge portion 2a can be easily grasped only by confirming the state of the line 11 (whether or not part of the line disappears), the laser beam 5 can be detected. Even when it is fitted to the side surface 12a of the cutting edge portion 2a on the main body side, the above-mentioned matching work can be easily performed from the rear side in the cutting direction.

In the above embodiment, the laser oscillator 4 is mounted on the saw cover 3 and the hole 3a is provided in the saw cover 3 so that the laser beam 5 can irradiate the portion behind the intersection G in the cutting direction. However, the laser oscillator 4 may be arranged inside the saw cover 3.

Further, in the above embodiment, the laser oscillator 4
In addition to the mechanism, the laser oscillator is configured so that the laser beam 5 can be rotated about the portion C where the laser beam 5 oscillates as a fulcrum. Mechanism for rotating 4 and laser beam 5
It is also possible to provide a mechanism for rotating the laser oscillator 4 with a fulcrum portion extending so as to be orthogonal to the bottom surface of the base 9 so that the verticality with respect to the bottom surface of the base 1 can be adjusted.

[0030]

According to the present invention, the light beam irradiation device is arranged rearward in the cutting direction with respect to the tangential direction with respect to the intersection where the outer periphery of the saw blade and the base bottom face intersect, and the light beam is irradiated behind the intersection point in the cutting direction. It is possible and the light beam irradiation device is configured to be able to move in parallel to the rotation axis direction of the saw blade, so that the light beam is located within the width of the blade tip only by checking the line that appears on the material to be cut. Can be easily grasped,
It is possible to easily perform the work of aligning the light beam with one of the side surfaces of the cutting edge portion, and it is possible to provide a portable electric cutting tool with good workability.

[Brief description of drawings]

FIG. 1 is a cross-sectional front view of essential parts showing an embodiment of a portable electric cutting tool according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

4 is an explanatory view showing a relationship between a saw blade and a line appearing on a material to be cut when the portable electric cutting tool shown in FIG. 1 is used.

FIG. 5 is an explanatory view showing a cutting method of a conventional portable electric circular saw.

FIG. 6 is a sectional front view of an essential part showing an example of a conventional portable electric circular saw.

7 is an explanatory view showing a relationship between a saw blade and a line appearing on a material to be cut when the portable electric circular saw shown in FIG. 6 is used.

FIG. 8 is an enlarged front view of an essential part showing an example of a saw blade used for a portable electric circular saw.

9 is an enlarged view of a main part of the F direction arrow of FIG.

[Explanation of symbols]

Reference numeral 1 is a base, 2 is a saw blade, 3 is a saw cover, 4 is a laser oscillator, 5 is a laser beam, 6 is a material to be cut, 6a is an end surface of the material to be cut, and 12a and 12b are side surfaces of the cutting edge.

Claims (3)

[Claims] 1. A main body having a built-in electric motor, a saw blade rotatably held by the main body, which is rotationally driven by the electric motor, and a shape provided on the main body to partially cover the saw blade. A saw cover, a base attached to the main body and having an opening capable of projecting a part of the saw blade downward, and capable of sliding on the upper surface of the material to be cut at the time of cutting work, and a light beam extending in the cutting direction of the saw blade. In the electric cutting machine having a light beam irradiation device capable of irradiating, the light beam irradiation device is arranged rearward in the cutting direction with respect to a tangential direction with respect to an intersection where the outer circumference of the saw blade and the base bottom surface intersect, and the light beam is A portable electric cutting tool, characterized in that it is capable of irradiating behind a crossing point with respect to the cutting direction and the light beam irradiation device can be moved in parallel to the rotational axis direction of the saw blade. 2. The portable electric cutting tool according to claim 1, wherein the light beam irradiating device can irradiate a front side in a cutting direction with respect to an end portion of the base. 3. The light beam irradiation device is arranged on the saw cover, and the saw cover is provided with a hole through which the light beam can pass within an irradiation range of the light beam.
Alternatively, the portable electric cutting tool according to claim 2.