JP2005319814A - Electric cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric cutting machine in which storage of chips on a material to be cut is suppressed by using a wind of a fan without increasing the number of components and which can improve workability. <P>SOLUTION: In the electric cutting machine, an exhaust port 9 of a fan wind is formed by preparing two or more bulkheads 4a in a peripheral wall 4c of a saw cover 4, an inclined portion 4f which inclined so that its distance with the side of a saw blade 1 might become small as it goes to radial outside is prepared near the fan exhaust port 9 of a wall surface 4d of the saw cover 4 located between a saw blade case 4b and a motor housing 3, and a fan wind generated by the rotation of a fan 7 is guided near a opening 5a of a base 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric cutting machine such as a portable circular saw having a fan for cooling an electric motor (hereinafter referred to as a portable circular saw).

  An example of a conventional portable circular saw is shown in FIGS.

  The portable circular saw shown in the figure includes a saw blade 1, an electric motor 2 that rotationally drives the saw blade 1, a motor housing 3 that houses the electric motor 2, a saw cover 4 that rotatably holds the saw blade 1, and a motor housing. 3 and a base 5 having an opening 5a that is provided below the saw cover 4 and allows the saw blade 1 to protrude from the lower surface. The saw cover 4 is attached to the motor housing 3, and the base 5 is a motor. The housing 3 or the saw cover 4 or the motor housing 3 and the saw cover 4 are connected.

  The power of the electric motor 2 is transmitted to the saw blade 1 via a gear (not shown) and the saw blade 1 is rotated. A fan 7 for cooling the electric motor 2 is attached to the electric motor 2, and when the electric motor 2 is driven to rotate, the fan 7 rotates, and the motor is driven from the wind window 8 provided at the end of the motor housing 3 on the side opposite to the saw cover 4. The fan air 13 flowing into the housing 3 flows through the motor housing 3 as shown in FIG. 15, and the fan air discharge port 9 formed by a plurality of partition walls 4a provided on the outer peripheral wall 4c of the saw cover 4 on the motor housing 3 side. More discharged to the outside.

  The fan air outlet 9 of the saw cover 4 is provided at a position spaced apart from the fan 7 in the axial direction of the fan 7 and is provided on the outer side in the radial direction of the fan 7. The fan wind 13 passes through the inside of the outer peripheral wall 4 c of the saw cover 4, blows against the wall surface 4 d disposed between the saw blade storage portion 4 b and the motor housing 3, and is then discharged to the outside through the fan wind discharge port 9. As shown in FIGS. 14 and 15, the fan air discharge port 9 is provided on the right side in the drawing, which is the front in the cutting direction, and thereby the fan air 13 is discharged toward the operator during the cutting operation. (Normally, the operator is positioned on the rear side in the cutting direction during cutting work).

  Thus, the fan air 13 that flows through the motor housing 3 by the rotation of the fan 7 and blows against the wall surface 4d is cut along the wall surface 4d through the fan air discharge port 9, as shown in the drawing, that is, the saw blade 1 It was discharged to the outside almost in parallel with the longitudinal direction of.

  In addition, as a conventional portable circular saw of this type, the installation angles of the plurality of partition walls 4a of the saw cover 4 forming the fan air discharge port 9 are made different shapes as shown in Utility Model Registration No. 2543298. There is a configuration in which the fan wind 13 is discharged toward the vicinity of a predetermined position on the upper surface of the base 5, but also in this portable circular saw, the fan wind 13 is discharged almost parallel to the longitudinal direction of the saw blade 1. It was to be done.

  Next, another example of a conventional portable circular saw is shown in FIGS.

  The portable circular saw shown in the figure has the fan 7 in the same manner as the portable circular saw shown in FIGS. 14 to 19 described above. However, the fan wind discharge port is provided on the motor housing 3 side outer peripheral wall 4c of the saw cover 4. Fan air that discharges the fan air 13 into the saw blade housing portion 4b by forming a plurality of partition walls 4a on the wall surface 4d disposed between the saw blade housing portion 4b and the inside of the motor housing 3 without forming 9. The discharge port 9 is formed.

  24, 25, etc., the partition 4a forming the fan air discharge port 9 has a shape erected in the axial direction of the fan 7, and therefore the fan air 13 is in the axial direction of the fan 7. Then, the fan wind 13 is blown almost perpendicularly to the side surface of the safety cover 6 or the side surface of the saw blade 1 located in the saw blade storage portion 4b. It was diffused in the blade storage portion 4b.

  In a cutting operation using a portable circular saw, a cutting line is often drawn on the upper surface of a material to be cut in order to improve cutting accuracy, and the cutting operation is performed while aligning the cutting edge of the saw blade 1 with the marking line.

  However, in the configuration of the conventional portable circular saw as described above, the visibility of the marking line is reduced due to accumulation of chips generated during the cutting operation on the upper surface of the material to be cut, and the workability is reduced. There was a drawback that it would.

  In particular, in order to improve the cutting accuracy, it is necessary to confirm the cutting portion between the cutting edge of the saw blade 1 and the material to be cut within the range of the opening 5a of the base 5, and within this range of the opening 5a. When chips are accumulated on the upper surface of the workpiece to be cut, the visibility of the marking line is lowered and workability is lowered.

  Also, the position of the guide member or guide means located on the longitudinal extension line of the saw blade 1 indicating the cutting edge of the saw blade 1 in the vicinity of the front end of the base 5 in the cutting direction, and the marking line drawn on the upper surface of the material to be cut When performing the cutting operation while checking the relationship, the chips are collected on the material to be cut located on the front side of the base 5 in the cutting direction, so that the visibility of the marking line is lowered and the workability is lowered. It was an end.

  As a means for solving the above-mentioned drawbacks, as shown in Japanese Utility Model Laid-Open No. 55-154101, a cylindrical guide pipe is attached so as to communicate with the fan discharge port, and the fan wind is placed near the above-described material to be cut. A configuration that prevents chips from accumulating on the material to be cut by guiding can be considered, but in such a configuration, the guide pipe has a positional relationship between the marking line and the blade edge of the saw blade. In the meantime, the visibility of the marking line decreases, and the number of components increases, resulting in a decrease in assemblability and an increase in cost.

  The object of the present invention is to eliminate the above-mentioned drawbacks and to suppress the accumulation of chips on the material to be cut by using a fan air without increasing the number of parts, thereby improving workability. It is to provide an electric cutting machine that can.

  The above-mentioned purpose is to form a fan air discharge port by providing a plurality of partition walls on the outer peripheral wall of the saw cover, and in the radial direction near the fan discharge port on the wall surface of the saw cover arranged between the saw blade housing and the motor housing. This can be achieved by providing an inclined portion that is inclined so that the distance from the side surface of the saw blade decreases toward the outside, and guides the fan air generated by the rotation of the fan to the vicinity of the opening of the base. .

  According to the present invention, as described above, the number of parts is increased by providing the inclined portion that inclines the discharge direction of the fan wind so that the fan wind generated by the rotation of the fan is discharged near the opening of the base. Thus, it is possible to provide an electric cutting machine that can suppress the accumulation of chips on the material to be cut by using the fan air and can improve workability.

  Hereinafter, a first embodiment of the portable circular saw of the present invention will be described with reference to FIGS.

  The portable circular saw shown in the figure includes a saw blade 1, an electric motor 2 that rotationally drives the saw blade 1, a motor housing 3 that houses the electric motor 2, a saw cover 4 that rotatably holds the saw blade 1, and a motor housing. 3 and a base 5 having an opening 5a that is provided below the saw cover 4 and allows the saw blade 1 to protrude from the lower surface. The saw cover 4 is attached to the motor housing 3, and the base 5 is a motor. The housing 3 or the saw cover 4 or the motor housing 3 and the saw cover 4 are connected. The saw cover 4 holds a safety cover 6 having a shape covering the outer periphery of a substantially semicircular portion of the saw blade 1 so as to be rotatable concentrically with the saw blade 1.

  The power of the electric motor 2 is transmitted to the saw blade 1 via a gear (not shown) and the saw blade 1 is rotated. A fan 7 for cooling the electric motor 2 is attached to the electric motor 2, and when the electric motor 2 is driven to rotate, the fan 7 rotates, and the motor is driven from the wind window 8 provided at the end of the motor housing 3 on the side opposite to the saw cover 4. The fan air 13 that has flowed into the housing 3 flows through the motor housing 3 as shown in FIG. 2 and is formed by a plurality of partition walls 4a provided on the outer peripheral wall 4c near the end of the saw cover 4 on the motor housing 3 side. It is discharged from the discharge port 9 to the outside.

  The fan air outlet 9 of the saw cover 4 is provided at a position spaced apart from the fan 7 in the axial direction of the fan 7 and is provided on the outer side in the radial direction of the fan 7. The fan wind 13 passes through the inside of the outer peripheral wall 4 c of the saw cover 4, blows against the wall surface 4 d disposed between the saw blade storage portion 4 b and the motor housing 3, and is then discharged to the outside through the fan wind discharge port 9. As shown in FIG. 2, the fan air discharge port 9 and the guide passage 14 are provided at a position where the fan air discharge port 9 is discharged in the right direction in the figure, which is the front of the cutting direction. It is prevented from being discharged toward the person.

  A wall surface 4d is disposed between the saw blade storage portion 4b and the motor housing 3 so that the fan wind 13 does not flow into the saw blade storage portion 4b in the saw cover 4, but FIG. 2, FIG. 4, FIG. As shown in FIG. 4, an inclined portion 4e is provided at a location in the vicinity of the fan wind outlet 9 of the wall surface 4d.

  The inclined surface 4e is inclined so that the distance from the side surface of the saw blade 1 becomes smaller toward the outer side in the radial direction, and the plurality of partition walls 4a forming the fan air discharge port 9 are formed on a base as shown in FIG. 5, in particular, the fan wind 13 discharged from the fan wind discharge port 9 along the inclined surface 4e is inclined toward the vicinity of the cut portion within the range of the opening 5a as shown in the figure. It is discharged toward the range of the opening 5a of the base 5. For this reason, it becomes possible to prevent the chips generated during the cutting operation from accumulating on the material to be cut within the range of the opening 5a of the base 5 and to improve the visibility of the marking lines. Can be improved.

  Further, as shown in FIGS. 1 and 6, a groove 5b communicating with the opening 5a is provided from the opening 5a to the end of the base 5 on the bottom surface of the base 5 and in front of the opening 5a in the cutting direction. Yes.

  The groove portion 5 b is provided on the longitudinal extension line of the saw blade 1, and the width direction has a shape having a dimension larger than the width dimension of the saw blade 1.

  The fan air 13 discharged into the range of the opening 5a by the inclined portion 4e provided on the wall surface 4d described above blows and diffuses to the upper surface of the material to be cut that is located in the range of the opening 5a during the cutting operation. As described above, by providing the groove portion 5b on the bottom surface of the base 5, part of the diffused fan wind 13 passes through the space between the groove portion 5b and the upper surface of the material to be cut and is discharged along the upper surface of the material to be cut. Thus, the discharge direction is determined so as to be discharged to the front side in the cutting direction from the end of the base 5. For this reason, it is possible to suppress the accumulation of chips on the upper surface of the material to be cut within the range of the opening 5a by the fan air 13 and also to the chips on the upper surface of the material to be cut in the cutting direction front side from the end surface of the base 5. Can be suppressed, and workability can be further improved.

  The above-described portable circular saw has a configuration in which the angle of the saw blade 1 can be inclined with respect to the bottom surface of the base 5. However, since this inclination fulcrum (not shown) is provided on the base 5, the base 5 When the angle of the saw blade 1 is tilted with respect to the bottom surface, the position of the saw blade 1 in the axial direction of the saw blade 1 with respect to the base 5 is changed, and the position is tilted to the maximum tiltable angle. Will move the most. Even when the angle of the saw blade 1 with respect to the bottom surface of the base 5 is inclined to the maximum, the width of the groove 5b described above is located on the longitudinal extension line of the saw blade 1 in the groove 5b, that is, the cutting operation. It is designed to be dimensioned so that the marking line sometimes passes.

  Next, 2nd Embodiment of the portable circular saw of this invention is described using FIGS.

  Unlike the portable circular saw shown in FIGS. 1 to 6 described above, the portable circular saw shown in the figure is configured to discharge the fan air 13 into the saw blade storage portion 4b of the saw cover 4. The shape of the plurality of partition walls 4a forming the fan air discharge port 9 is devised, and the other parts are the same as the structure of the conventional portable circular saw shown in FIGS. Is omitted.

  As shown in FIG. 7, the wall surface 4d disposed between the saw blade storage portion 4b and the motor housing 3 is provided with a plurality of partition walls 4a that form the fan air discharge ports 9, and the partition walls 4a are cut. As shown in FIG. 8, the partition wall 4 a that is substantially half on the front side in the direction is provided with an inclined portion 4 f that is inclined toward the front side in the cutting direction toward the end surface on the saw blade 1 side.

  Thus, the fan air 13 discharged into the saw blade storage portion 4b through the partition wall 4a provided with the inclined portion 4f is blown against the side surface of the saw blade 1 or the side surface of the safety cover 6 in an inclined state. For this reason, it is discharged to the vicinity of the front end portion in the cutting direction of the opening 5a which is the front end portion in the cutting direction of the saw blade storage portion 4b without changing the discharge direction forward in the cutting direction. For this reason, it can suppress that a chip accumulates on the to-be-cut material in the range of the opening part 5a, and can improve the visibility and workability | operativity of a marking line.

  In particular, it is required to improve the visibility of the marking line near the front in the cutting direction of the cutting edge 1 within the range of the opening 5a, but the partition 4a and the inclined portion 4e so that the fan air 13 is discharged in the vicinity. The workability can be further improved by designing the shape.

  Further, as shown in FIGS. 7 and 9, a groove 5b communicating with the opening 5a is provided from the opening 5a to the end of the base 5 at the bottom of the base 5 in the cutting direction front of the opening 5a. Yes.

  The groove portion 5 b is provided on the longitudinal extension line of the saw blade 1, and the width direction has a shape having a dimension larger than the width dimension of the saw blade 1.

  The fan air 13 discharged into the range of the opening 5a by the inclined portion 4f provided in the partition wall 4a blows and diffuses to the upper surface of the workpiece located in the range of the opening 5a during the cutting operation. As described above, by providing the groove portion 5b on the bottom surface of the base 5, part of the diffused fan wind 13 passes through the space between the groove portion 5b and the upper surface of the material to be cut and is discharged along the upper surface of the material to be cut. Thus, the discharge direction is determined so as to be discharged to the front side in the cutting direction from the end of the base 5. For this reason, it is possible to suppress the accumulation of chips on the upper surface of the material to be cut within the range of the opening 5a by the fan air 13 and also to the chips on the upper surface of the material to be cut in the cutting direction front side from the end surface of the base 5. Can be suppressed, and workability can be further improved.

  As in the first embodiment, the width of the groove 5b is such that the extension of the saw blade 1 in the longitudinal direction is within the groove 5b even when the angle of the saw blade 1 with respect to the bottom surface of the base 5 is inclined to the maximum. It is designed to be positioned, i.e., dimensioned so that a marking line passes during cutting.

  Next, a third embodiment of the portable circular saw of the present invention will be described below with reference to FIGS. In the present embodiment, the shape of the base 5 of the portable circular saw of the first embodiment described above or the portable circular saw of the second embodiment is devised, and other parts are described in the first embodiment or the first embodiment. Since it is the same as that of 2nd Embodiment, detailed description is abbreviate | omitted.

  FIG. 10 is a rear perspective view of the portable circular saw showing the bottom surface of the base 5. As shown in the figure, the front portion of the opening 5 a on the bottom surface of the base 5 communicates with the opening 5 a in the cutting direction. A groove 5b extending to the front end is provided. The groove part 5b is provided on the longitudinal extension line of the saw blade 1, and the width direction thereof is larger than the width dimension of the cutting edge part of the saw blade 1. As shown in the figure, a guide piece 5c pointing to the cutting edge of the saw blade 1 is provided at the front end of the base 5 in the cutting direction.

  When the angle of the saw blade 1 with respect to the bottom surface of the base 5 is a right angle, the guide piece 5c is positioned on the longitudinal extension line of the saw blade 1 and points to the cutting edge of the saw blade 1, and the saw blade 1 with respect to the bottom surface of the base 5 A guide portion 5e is provided to point the blade edge of the saw blade 1 when the angle is 45 degrees when the most work other than a right angle is 45 degrees. As shown in the drawing, the guide piece 5c is provided so that the bottom surface thereof is located above the bottom surface of the base 5, so that the fan air 13 that has flowed out into the groove portion 5b passes below the guide piece 5c and from the opposite portion of the base 5. Is also discharged forward in the cutting direction. The guide portions 5d and 5e have a shape extending downward so as to be substantially flush with the bottom surface of the base 5 so that the relative relationship with the marking line can be easily confirmed.

  Next, a fourth embodiment of the portable circular saw of the present invention will be described below with reference to FIG. In the present embodiment, the shape of the groove 5b of the third embodiment described above is devised.

  As shown in the figure, the shape of the groove 5b is formed so as to expand toward the motor housing 3 in the direction of the rotation axis of the saw blade 1 as it goes toward the opening 5a. This is because, in the configuration of the first embodiment or the second embodiment, the fan air 13 is relatively discharged to the motor housing 3 side from the saw blade 1 (particularly, in the configuration of the second embodiment, compared to the saw blade 1). This is because more fan air 13 is discharged to the upper surface of the material to be cut in the cutting direction front side than the end of the base 5.

  In addition to this, for example, the fan wind 13 can be formed by making the shape of the groove portion 5b wider than the bottom surface of the base 5 toward the opening 5a, or by spreading the groove portion 5b in the direction of the rotation axis of the saw blade 1. It is possible to increase the discharge amount discharged to the upper surface of the workpiece to be cut in front of the five end portions in the cutting direction.

The front view which shows 1st Embodiment of this invention portable circular saw. The principal part cross-sectional top view which shows 1st Embodiment of this invention portable circular saw. The principal part cross-sectional top view which shows 1st Embodiment of this invention portable circular saw. The rear view which shows 1st Embodiment of the saw cover which comprises this invention portable circular saw. AA line sectional view of Drawing 4. 1 is a bottom perspective view showing a first embodiment of the portable circular saw of the present invention. The front view which shows 2nd Embodiment of this invention portable circular saw. The principal part cross-sectional top view which shows 2nd Embodiment of this invention portable circular saw. The bottom view which shows 2nd Embodiment of this invention portable circular saw. The bottom perspective view which shows 3rd Embodiment of this invention portable circular saw. The principal part expansion perspective view of 3rd Embodiment of the portable circular saw of this invention. The perspective view which shows one working state of 3rd Embodiment of this invention portable circular saw. The bottom perspective view which shows 4th Embodiment of this invention portable circular saw. The principal part cross-sectional front view which shows an example of the conventional portable circular saw. The principal part cross-sectional top view which shows an example of the conventional portable circular saw. The principal part cross-sectional side view which shows an example of the conventional portable circular saw. The perspective view which shows an example of the conventional portable circular saw. The rear perspective view which shows an example of the saw cover which comprises the conventional portable circular saw. The rear view which shows an example of the saw cover which comprises the conventional portable circular saw. The principal part cross-sectional front view which shows the other example of the conventional portable circular saw. The principal part cross-sectional top view which shows the other example of the conventional portable circular saw. The principal part cross-sectional side view which shows the other example of the conventional portable circular saw. The perspective view which shows the other example of the conventional portable circular saw. The rear perspective view which shows the other example of the saw cover which comprises the conventional portable circular saw. The rear view which shows the other example of the saw cover which comprises the conventional portable circular saw.

Explanation of symbols

1 is a saw blade, 2 is an electric motor, 3 is a motor housing, 4 is a saw cover, 4a is a partition wall, 4b is a saw blade housing portion, 4c is an outer wall, 4d is a wall surface, 4e is an inclined portion, 4f is an inclined portion, A base, 5a is an opening, 5b is a groove, 6 is a safety cover, 7 is a fan, 8 is a wind window, 9 is a fan wind outlet, and 13 is a fan wind.

Claims (3)

A saw blade, an electric motor that rotationally drives the saw blade, a motor housing that houses the electric motor, a fan that rotates together with the electric motor, and a saw cover that has a saw blade housing portion that houses a portion of the saw blade, A base provided below the motor housing and the saw cover and having an opening that allows the saw blade to protrude from the lower surface; the saw cover is attached to the motor housing; and the base is the motor housing or the An electric cutting machine connected to a saw cover,
A fan air discharge port is formed by providing a plurality of partition walls on the outer peripheral wall of the saw cover, and a radial direction is provided in the vicinity of the fan discharge port on the wall surface of the saw cover that is disposed between the saw blade storage portion and the motor housing. An inclined portion is provided to be inclined so that the distance from the side surface of the saw blade decreases toward the outside, and the fan wind generated by the rotation of the fan is guided to the vicinity of the opening of the base. Electric cutting machine to do. The electric cutting machine according to claim 1, wherein the inclined portion is inclined toward an intersection of a blade edge of the saw blade and the base bottom surface. The electric cutting machine according to claim 2, wherein the partition wall is inclined toward the base.

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