JP3829673B2 - Portable electric circular saw - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable electric circular saw equipped with a laser oscillator.
[0002]
[Prior art]
One example of a conventional portable electric circular saw provided with a laser oscillator is a portable electric circular saw disclosed in US Pat. No. 5,375,495. This portable electric circular saw has a configuration in which a laser oscillator that irradiates a laser beam onto a material to be cut is provided near the front end portion in the cutting direction of the base, and the laser beam is irradiated near the cutting portion of the saw blade. Also, in order to translate the laser beam in the direction of the rotation axis of the saw blade and allow the laser beam to follow any side of the saw blade, the laser oscillator is translated in the direction of the rotation axis of the saw blade. Hold it possible.
[0003]
[Problems to be solved by the invention]
The conventional portable electric circular saw described above performs a cutting operation by drawing a marking line as a reference for cutting on the upper surface of a material to be cut and aligning a line-shaped laser beam emitted from a laser oscillator with the saw blade. However, since the laser oscillator is provided in the vicinity of the front end portion in the cutting direction of the base, the laser oscillator reduces the visibility of the marking line on the material to be cut.
[0004]
In addition, since the laser beam that guides the cutting direction is irradiated onto the material to be cut by one laser oscillator, the laser beam does not have a function of teaching the operator the cutting width at the time of cutting.
[0005]
In addition, by moving the laser beam to a position along one of the side surfaces of the saw blade and performing the cutting operation, it is possible to perform a cutting operation with high accuracy along the marking line. Accordingly, the laser beam has to be translated in order to make the laser beam follow one of the side surfaces of the saw blade. Further, the work of bringing the laser beam along the side surface of the saw blade is performed while directly looking at the relationship between the saw blade and the laser beam, and the workability is lowered.
[0006]
An object of the present invention is to provide a portable electric circular saw with good workability, which eliminates the above-mentioned drawbacks and can provide the operator with the cutting width of the saw blade by providing one laser oscillator. is there.
[0007]
[Means for Solving the Problems]
The purpose of the above is to provide a laser oscillator that irradiates a line-shaped laser beam in front of the cutting direction of the saw blade, and to provide a translation adjustment mechanism that translates the laser beam of the laser oscillator in the direction of the rotation axis of the saw blade. The saw blade has a guide surface extending in the cutting direction of the saw blade, pointing to the position of the cutting edge of the saw blade in the vicinity of the end in the cutting direction of the base. This is achieved by providing a guide piece that can be translated in the direction of the rotation axis, so that a part of the laser beam irradiates the vicinity of the guide means .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the portable electric circular saw of the present invention will be described below with reference to FIGS.
[0009]
As shown in the figure, the portable electric circular saw includes a main body 5 having an electric motor (not shown), a saw blade 3 rotatably held by the main body 5 and driven to rotate by the electric motor. A base 1 having an opening 1 a that can project a part of the saw blade 3 downward, and a saw cover 2 that is provided in the main body 5 and covers the upper portion of the saw blade 3. A safety cover 4 having a shape covering a part of the saw blade 3 projecting downward from the base 1 is held so as to be rotatable on the rotation shaft of the saw blade 3. The main body 5 has a shape in which an electric motor that drives the saw blade 3 to rotate is incorporated on the back side of the saw blade 3 (the right side surface in FIG. 2).
[0010]
As shown in the figure, a laser unit 7 having a laser oscillator 9 inside is provided on the upper portion of the saw cover 2. The laser oscillator 9 can irradiate a laser beam 8 parallel to the cutting direction of the saw blade 3 on the upper surface of the workpiece in front of the cutting direction as shown in the figure.
[0011]
As shown in the figure, the saw cover 2 has a structure in which a hole 2a communicating with the inside of the saw cover 2 is provided in a range in which the laser beam 8 emitted from the laser oscillator 9 can pass, and the laser beam 8 is located forward in the cutting direction. In addition to irradiation, the vicinity of the cutting portion of the saw blade 3 in the saw cover 2 is also irradiated.
[0012]
As shown in FIGS. 3 and 4, the laser oscillator 9 is guided by a guide bar 10 parallel to the rotation axis direction of the saw blade 3 to translate the laser beam 8 in the rotation axis direction of the saw blade 3. Can be done.
[0013]
As shown in FIGS. 3 and 6, when the safety cover 4 is rotated in the direction A in which the saw blade 3 is exposed, the end of the safety cover 4 on the laser oscillator 9 side is irradiated with a linear laser beam. A long groove 12 is provided as a transmission means for transmitting 8.
[0014]
As shown in FIG. 7, guide holes 13a and 13b indicating the cutting direction of the saw blade 3 and elongated holes 13c extending in the rotation axis direction of the saw blade 3 are provided in the vicinity of the front end of the base 1 in the cutting direction. A guide piece 13 attached to the base 1 by a bolt 15 through 13c is provided. The guide piece 13 can be moved in the direction of the rotation axis of the saw blade 3 by loosening the bolt 15, and the guide surface 13 a can be along any side surface of the saw blade 3. The guide surface 13a is provided to indicate the cutting direction of the saw blade 3 when the angle between the bottom surface of the base 1 and the saw blade 3 is 90 degrees, and the guide surface 13b is the angle between the bottom surface of the base 1 and the saw blade 3. Is provided to indicate the cutting direction of the saw blade 3 when the angle is 45 degrees.
[0015]
As shown in the figure, the laser beam 8 emitted by the laser oscillator 9 can irradiate the vicinity of the guide piece 13, and by moving the laser oscillator 9 or the guide piece 13 in the direction of the rotation axis of the saw blade 3, The laser beam 8 and the guide surfaces 13a and 13b can be matched.
[0016]
The saw blade 3 used in the portable electric circular saw has various shapes, and the cutting width W ′ according to the width W of the blade tip portion of the saw blade 3 varies depending on the type of the saw blade 3. Further, when the angle between the saw blade 3 and the bottom surface of the base 1 is changed, the position of the saw blade 3 with respect to the guide piece 13 changes. For this reason, in the conventional portable electric circular saw, it has been difficult to accurately place the guide piece 13 along one of the side surfaces of the saw blade 3, but as described above, the configuration of the portable electric circular saw of the present invention is as follows. As a result, the laser beam 8 is translated in the direction of the rotation axis of the saw blade 3, and the guide piece 13 is moved along the laser beam 8 in a state along the one side surface of the saw blade 3, thereby making the guide piece 13 accurate. It becomes possible to follow the side surface of the saw blade 3 well. For this reason, even when performing the cutting operation without using the laser beam 8, by using the guide surface 13a of the guide piece 13, the cutting operation can be performed with relatively high accuracy.
[0017]
Further, the laser oscillator 9 is moved in parallel with the guide bar 10 as a guide in the state where the guide surface 13a or the guide surface 13b, which is the guide portion of the guide piece 13, is aligned with one side surface position B of the saw blade 3 by the above operation. The line-shaped laser beam 8 is aligned with the side surface position C opposite to the side surface position B indicated by the guide portion of the guide piece 13. As a result, as shown in FIGS. 7 and 8, the distance W between the guide surface 13 a of the guide piece 13 and the line-shaped laser beam 8 coincides with the cutting width W ′ of the saw blade 3.
[0018]
As shown in FIGS. 9 and 10, when cutting a hole in the cut material 11 inside the dimension F of the square marking line 14, the safety cover 4 is rotated in the direction A to move the saw blade 3. Expose. At this time, since the long groove 12 is provided at the end of the safety cover 4 on the laser unit 7 side, a line shape parallel to the cutting direction of the saw blade 3 on the upper surface even when the safety cover 4 rotates in the A direction. The laser beam 8 irradiates the upper surface 11 of the workpiece near the cutting portion of the saw blade 3. Next, the line-shaped laser beam 8 is aligned with the marking line 14 and the saw blade 3 is pushed toward the material 11 to be cut. Since the marking line 14 and the line-shaped laser beam 8 indicating the cutting edge position C of the saw blade 3 are matched even during cutting, the position of the marking line 14 and the marking line 14 is confirmed by the line-shaped laser beam 8 even during cutting. it can. Further, when cutting the outside of the dimension F of the square marking line 14, the cutting edge position B displayed by the guide piece 13 is aligned with the marking line 14 and cut in the same manner.
[0019]
Next, another embodiment of the portable electric circular saw of the present invention will be described with reference to FIGS.
[0020]
In the embodiment shown in the figure, the laser beam 8 emitted from the laser oscillator 9 is configured to irradiate only the material to be cut ahead in the cutting direction. In the above embodiment, since the laser beam 8 can be irradiated near the cutting portion of the saw blade 3, the position of the laser beam 8 relative to the saw blade 3 can be easily grasped. Then, the positional relationship between the laser beam 8 and the saw blade 3 can be grasped by using the guide member 13 on the base 1.
[0021]
As shown in the drawing, a concave portion 16 having a guide surface 16a serving as a guide portion is provided at the front end portion of the base 1 in the cutting direction. The guide surface 16a is disposed so as to coincide with the center position of the cutting edge portion of the saw blade 3. As shown in the figure, the laser beam 8 emitted from the laser oscillator 9 irradiates the vicinity of the front end in the cutting direction of the base 1 within a range that can coincide with the guide surface 16a. Accordingly, the relationship between the laser beam 8 and the saw blade 3 can be easily grasped by adjusting the positional relationship between the guide surface 16a and the laser beam 8 with reference to the guide surface 16a.
[0022]
In addition, although this embodiment demonstrated the portable electric circular saw as an example, it is applicable also to cutting machines, such as a portable electric groove cutter and a portable electric cutter. Further, in the present embodiment, the end portion of the safety cover 4 is provided with the long groove 12 so as to transmit the line-shaped laser light 8, but at least the end portion of the safety cover 4 is partially or entirely transparent to form a line shape. The same effect can be obtained even if the laser beam 8 is transmitted. In addition, the guide surface having a surface extending in the cutting direction of the saw blade 3 as the guide portion has been described as an example, but a convex or concave guide member may be used.
[0023]
【The invention's effect】
According to the present invention, it is possible to easily teach the operator of the cutting width of the saw blade by having the laser beam along the side surface facing the display position of the guide piece only by providing one laser transmitter. A portable electric circular saw with good workability can be provided .
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a portable electric circular saw according to the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is an enlarged cross-sectional view of a main part taken along line AA in FIG. 5;
4 is an explanatory diagram showing a state of a laser oscillator in parallel movement in the portable electric circular saw of FIG. 1. FIG.
5 is a side view showing an irradiation range of a laser oscillator in the portable electric circular saw of FIG. 1. FIG.
6 is a partial cross-sectional view showing the operating position of the safety cover in the portable electric circular saw of FIG. 1. FIG.
7 is an essential part enlarged plan view showing the vicinity of the front end portion of the base in the cutting direction of the portable electric circular saw of FIG. 1; FIG.
FIG. 8 is an enlarged view of a main part showing a saw blade and a material to be cut at the time of cutting.
FIG. 9 is a perspective view showing an inside dimension of a marking line of a material to be cut and a position of a line-shaped laser beam.
FIG. 10 is a perspective view showing a marking line outer dimension of a material to be cut and a position of a line-shaped laser beam.
FIG. 11 is a side view of an operation for cutting out a material to be cut.
FIG. 12 is a front view showing another embodiment of the portable electric circular saw of the present invention.
13 is an enlarged plan view of a main part showing the vicinity of the front end portion in the cutting direction of the base in the portable electric circular saw of FIG. 12. FIG.
[Explanation of symbols]
2 is a saw cover, 3 is a saw blade, 4 is a safety cover, 7 is a laser unit, 8 is a laser beam, 9 is a laser oscillator, and 13 is a guide piece.

Claims (3)

A main body having a built-in electric motor and rotatably holding a saw blade that is rotationally driven by the electric motor; a base that is attached below the main body and has an opening that can project a part of the saw blade downward; and the main body A portable electric circular saw provided with a saw cover for covering a part of the saw blade, wherein a laser oscillator for irradiating a line-shaped laser beam in front of the cutting direction of the saw blade is provided; A parallel movement adjustment mechanism for translating the laser beam in the direction of the rotation axis of the saw blade is provided so that the laser beam can be caused to follow both side surfaces of the saw blade, and the cutting direction end of the base A guide piece that indicates a position of the cutting edge of the saw blade and extends in the cutting direction of the saw blade in the vicinity of the portion, and is provided with a guide piece that can be translated in the rotational axis direction of the saw blade. Portable electric circular saw which is characterized in that so as to irradiate the serial guide means near. 2. The portable electric circular saw according to claim 1, wherein the laser beam can be irradiated also in the vicinity of a cutting portion of the saw blade. The laser oscillator is placed on the saw cover, and a hole through which the laser beam emitted from the laser oscillator can pass is provided on the saw cover, so that the laser beam can irradiate the vicinity of the cutting portion of the saw blade. The portable electric circular saw according to claim 1, characterized in that:

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