JP4428301B2 - Portable electric cutting machine - Google Patents

Description

  The present invention relates to a portable electric cutting machine such as a portable circular saw or jigsaw having a fan for cooling an electric motor.

  The structure of a portable circular saw is shown in FIGS. 12 and 13 as an example of a conventional portable electric cutting machine.

  12 is a cutaway plan view of a conventional portable circular saw, and FIG. 13 is a rear perspective view of the portable circular saw. The illustrated portable circular saw includes a saw blade 1 and the saw blade 1. Are provided below the motor housing 3 and the saw cover 4, and the saw blade 1 is disposed below the lower surface of the motor housing 3 and the saw cover 4. The saw cover 4 is attached to the motor housing 3, and the base 5 is connected to the saw cover 4. The saw cover 4 holds a safety cover 6 having a shape that covers the outer periphery of a substantially semicircular portion of the saw blade 1 so as to be able to rotate concentrically with the saw blade 1.

  Thus, 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 rotationally driven at a predetermined speed. Here, a fan 7 for cooling the motor 2 is attached to the electric motor 2. When the electric motor 2 is driven to rotate, the fan 7 rotates and is provided at the end of the motor housing 3 on the side opposite to the saw cover 4. The fan air 9 that has flowed into the motor housing 3 from the suction port 8 flows through the motor housing 3 to cool the electric motor 2.

  By the way, a plurality of partition walls 4b forming a fan air discharge port are provided on the wall surface disposed between the saw blade storage portion 4a of the saw cover 4 and the motor housing 3, and the partition walls 4b include saw walls. An inclined portion 4c having a shape inclined toward the front side in the cutting direction as it goes toward the side end face of the blade 1 is provided.

  Thus, the fan air 9 flowing inside the motor housing 3 passes through the partition wall 4b provided with the inclined portion 4c and is discharged into the saw blade storage portion 4a, where the side surface of the saw blade 1 or the side surface of the safety cover 6 is discharged. And is discharged toward the front side in the cutting direction of the opening 5a of the saw blade storage portion 4a with almost no change in the discharging direction forward in the cutting direction.

  As shown in FIG. 13, a groove portion 5 b communicating with the opening portion 5 a is provided from the opening portion 5 a to the end portion of the base 5 on the bottom surface of the base 5 and in the front portion of the opening portion 5 a in the cutting direction. ing. As shown in the figure, a guide piece 10 having a guide portion 10 a pointing to the cutting edge of the saw blade 1 is provided at the front end portion of the base 5 in the cutting direction. Here, the guide piece 10 is provided such that its bottom surface is located above the bottom surface of the base 5.

  The groove 5 b is provided on the longitudinal extension line of the saw blade 1, and its width direction dimension is set larger than the width dimension of the saw blade 1.

  By the way, the fan air 9 discharged into the range of the opening 5a by the inclined portion 4c of the saw cover 4 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. By providing the groove portion 5b on the bottom surface of the base 5 as described above, a part of the diffused fan wind 9 passes through the space between the groove portion 5b and the upper surface of the workpiece, and is discharged along the upper surface of the workpiece. Thus, the discharge direction is determined, and the sheet 5 is discharged to the front side in the cutting direction from the end of the base 5. Then, the fan air 9 that has flowed out into the groove 5 b passes through the lower part of the guide piece 10 and is discharged to the front side in the cutting direction from the end of the base 5. Since the fan wind 9 makes it possible to remove chips accumulated on the marking line ahead of the end of the base 5 in the cutting direction, the relative relationship between the guide portion 10a of the guide piece 10 and the marking line is confirmed. It becomes easy.

In the cutting work using such a portable circular saw, in order to improve the cutting accuracy, a marking line is drawn on the upper surface of the material to be cut, and the cutting work is often performed while aligning the guide portion 10a with the marking line. The fact that the relative relationship between the marking line and the guide portion 10a can be easily confirmed has led to an improvement in workability.
Japanese Patent Application No. 2002-307696

  However, in the configuration of the conventional portable circular saw, since the groove portion 5b needs to be provided on the bottom surface of the base 5, there is a problem that the strength of the base 5 is slightly reduced.

  As in the portable circular saw disclosed in Japanese Utility Model Publication No. 55-154101, a cylindrical guide pipe is attached so as to communicate with the fan outlet provided in the saw cover, and the fan wind is covered by the guide pipe. A configuration that guides to the vicinity of the cutting material and prevents accumulation of chips on the material to be cut can be considered, but in such a configuration, the guide pipe is positioned between the marking line and the blade edge of the saw blade. Since it becomes an obstacle when checking a relationship, workability | operativity will fall.

  By the way, in recent years, a method of irradiating a laser beam or LED light on a material to be cut instead of a marking line for clearly indicating a cut portion of the material to be cut has been adopted. When the powder adheres, the intensity of the laser beam irradiated onto the material to be cut decreases, and the visibility of the cut portion deteriorates. Further, when the laser oscillator generates heat, the brightness of the laser beam is lowered and the visibility of the cut portion is similarly deteriorated.

  The present invention has been made in view of the above-mentioned problems. The purpose of the present invention is to reduce the strength of the base without reducing the strength of the base by using a fan wind to scatter chips on the work material. Portable electric cutting that makes it easier to check the cutting edge and improves workability by preventing the reduction of light brightness due to sticking of chips to the light emitting part and heat generation and improving the visibility of the cut part Is to provide a machine.

In order to achieve the above object, the invention according to claim 1
A housing that houses an electric motor that drives the saw blade to rotate;
A saw cover attached to the housing, having a shape covering substantially the upper half of the outer periphery of the saw blade, and having a saw blade storage portion for storing a part of the saw blade;
A base connected to at least one of the saw cover or the housing and formed with an opening for projecting the saw blade downward from a bottom surface slidable on a cutting material;
A fan provided in the housing and driven to rotate by the electric motor;
In the portable electric cutting machine with
A discharge path for discharging at least a part of the fan wind generated by the rotation of the fan is formed by the outer periphery of the saw cover and the inside of a discharge path forming member attached to the saw cover , and the fan wind is passed through the discharge path. A light emitting unit that emits light toward the front side in the cutting direction of the material to be cut is disposed in the discharge path or the fan wind discharge path outside the discharge path while discharging toward the front side in the cutting direction of the base. And

  According to a second aspect of the present invention, in the first aspect of the present invention, the light emitting section is configured by a laser oscillator.

  According to a third aspect of the present invention, in the second aspect of the present invention, the laser oscillator is arranged at a position where the laser beam oscillated from the laser oscillator is irradiated on a cutting extension line of the material to be cut.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, a discharge path forming member that forms the discharge path is attached to the saw cover.

  The invention according to claim 5 is the invention according to claim 4, wherein the discharge path forming member is attached to the saw cover so as to cover at least a part of the fan air discharge port formed in the outer peripheral portion of the saw cover. And

  A sixth aspect of the invention is characterized in that, in the fourth or fifth aspect of the invention, the discharge path forming member is a cover member that forms the discharge path with an outer peripheral surface of the saw cover.

  A seventh aspect of the invention is characterized in that, in the invention of any one of the first to sixth aspects, a part of the discharge path is formed to extend on a longitudinal extension line of the saw blade.

  According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, the fan air discharged from the discharge path is discharged toward the front side from the front end portion in the cutting direction of the base. Features.

The invention according to claim 9
A housing that houses an electric motor that drives the saw blade;
A base formed with an opening for projecting the saw blade downward from a bottom surface slidable on the workpiece;
A fan provided in the housing and driven to rotate by the electric motor;
In the portable electric cutting machine with
A light emitting unit that emits light toward the cutting direction front side of the material to be cut is provided, and at least a part of the fan wind generated by the rotational drive of the fan is discharged toward the cutting direction front side and the light emitting unit. It is characterized by.

  A tenth aspect of the present invention is characterized in that, in the ninth aspect of the invention, the light emitting section is constituted by a laser oscillator.

  The invention according to claim 11 is the invention according to claim 10, characterized in that the laser oscillator is arranged at a position where the laser beam oscillated from the laser oscillator is irradiated on the cutting extension line of the material to be cut.

  According to the first aspect of the present invention, the fan wind generated by the rotational drive of the fan is discharged toward the front side in the cutting direction of the base through the discharge path. The chips on the material to be cut in the cutting direction front side of the base can be blown off by the fan wind without causing a decrease in the strength of the base, improving the visibility of the marking lines on the material to be cut and improving the workability. Can be planned.

  In addition, since the light emitting part is arranged in the discharge path or the fan wind discharge path outside the discharge path, chips are less likely to adhere to the light emitting part, and the cut portion on the material to be cut can be kept in a highly visible state. .

  Furthermore, since the light emitting part is cooled by the fan wind, the heat generation is suppressed, the brightness is prevented from lowering, the power consumption is reduced to save power, and an inexpensive light emitting part with a low heat resistant temperature is used. Cost reduction.

  According to the second aspect of the present invention, the light emitting portion is constituted by a laser oscillator, and according to the third aspect of the present invention, the laser oscillator oscillates on the cutting extension line of the material to be cut. Since it is arranged at the irradiated position, the cutting line of the material to be cut is clearly shown by the laser beam exhibiting high linearity, and the material to be cut can be easily and accurately cut along the cutting line.

  According to invention of Claims 4-6, discharge path formation members, such as a cover member, are comprised separately from a saw cover, this discharge path formation member is attached to a saw cover, and it discharges between the outer peripheral surfaces of this saw cover. Since the path is formed, the above-described effect can be obtained by forming the discharge path with almost no processing required for existing products.

  According to the seventh aspect of the present invention, since a part of the discharge path is formed to extend on the longitudinal extension line of the saw blade, the fan wind is discharged forward in the cutting direction even at the time of inclined cutting. As a result, chips in front of the cutting direction are blown away, and the occurrence of problems that the chips accumulate on the material to be cut and impair the visibility of the marking lines is prevented.

  According to the eighth aspect of the present invention, the fan wind discharged from the discharge path is discharged toward the front side from the front end portion in the cutting direction of the base. This can be blown away and removed from the material to be cut.

According to invention of Claim 9, the light emission part which irradiates light toward the cutting direction front side of a to- be-cut material is provided, At least one part of the fan wind generated by the rotational drive of a fan is said cutting direction front side, and Since it is discharged toward the light emitting part, it is possible to blow away the chips ahead of the cutting direction by the fan wind and to prevent the chips from adhering to the light emitting part and to make the cut part on the material to be cut visible. It can be kept in good condition.

  According to the invention described in claim 10, the light emitting portion is constituted by a laser oscillator. According to the invention described in claim 11, the laser oscillator oscillates on the cutting extension line of the material to be cut. Since it is arranged at the irradiated position, the cutting line of the material to be cut is clearly shown by the laser beam exhibiting high linearity, and the material to be cut can be easily and accurately cut along the cutting line.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
1 is a perspective view of a portable circular saw according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a state in which the cover member of the portable circular saw is removed, and FIG. 3 is a top perspective view of the cover member. 4 is a bottom perspective view of the cover member, FIG. 5 is a cutaway side view of the portable circular saw, FIG. 6 is a front perspective view showing a part of the cover member of the portable circular saw, and FIG. It is a bottom side perspective view of the portable circular saw.

  The portable circular saw according to the present embodiment 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, and a handle 15 that protrudes from the motor housing 3. A saw cover 4 that rotatably holds the saw blade 1, and a base 5 that is provided below the motor housing 3 and the saw cover 4 and has an opening 5a that 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 connected to the saw cover 4. The saw blade 1 has a shape that covers substantially the upper half of the outer periphery of the saw blade 1, and the saw blade storage portion 4 a of the saw cover 4 that stores a part of the saw blade 1 has an outer peripheral portion of a substantially semicircular portion of the saw blade 1. A safety cover 6 having a shape covering the center is held concentrically with the saw blade 1 so as to be rotatable.

  Thus, 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 rotationally driven at a predetermined speed to perform a required cutting operation.

  Here, the saw cover 4 holds the saw blade 1 in a rotatable manner and covers a part of the outer periphery of the saw blade 1, and a saw blade storage portion 4 a that is connected to the motor housing 3 and has an end surface not shown inside. And a substantially cylindrical tubular portion that accommodates gears and the like. As shown in FIGS. 2 and 5, a discharge port 12 communicating with the inside is formed on the outer periphery of the cylindrical portion of the saw cover 4.

  On the other hand, a fan 7 for cooling the electric motor 2 is attached to the electric motor 2, and when the electric motor 2 is driven, the fan 7 that is a centrifugal fan rotates, and the end of the motor housing 3 on the side opposite to the saw cover 4. The fan air 9 that has flowed into the motor housing 3 from the suction port 8 provided in the air flows through the motor housing 3 to cool the electric motor 2. The fan air 9 used for cooling the electric motor 2 is discharged to the outside of the saw cover 4 from the saw blade storage portion 4 a of the saw cover 4 and the discharge port 12.

  Thus, in the present embodiment, as shown in FIG. 1, the cover member 11 which is the discharge path forming member shown in FIGS. 3 and 4 is attached to the saw cover 4 with the screws 16, as shown in FIG. As shown, the discharge port 12 is opened in the cover member 11.

  The cover member 11 is formed in a shape along the outer wall of the saw cover 4, has a U-shaped (channel shape) cross-sectional shape, and is attached to the saw cover 4 as shown in FIGS. 3 and 4. Then, a predetermined discharge path 14 is formed inside with the outer wall of the saw cover 4 (see FIGS. 5 and 6).

  Further, one end of the cover member 11 (the right end portion in FIG. 3, the lower end portion in FIG. 4) is closed, and the vicinity of this one end is shown in FIG. 5 with the cover member 11 attached to the saw cover 4. As shown, the saw cover 4 has a shape covering the discharge port 12.

  On the other hand, the other end of the cover member 11 (the lower end portion in FIG. 3 and the right end portion in FIG. 4) is opened to form an open end portion 17, and the open end portion 17 is covered with the saw cover by the cover member 11. As shown in FIGS. 1 and 6, the saw cover 4 is opened to the upper front side in the cutting direction.

  1 and 6, a part of the cover member 11 is positioned on the longitudinal extension line of the saw blade 1 above the saw blade storage portion 4a of the saw cover 4 and on the longitudinal direction of the saw blade 1. It is arrange | positioned so that it may extend.

  As shown in FIGS. 3 and 4, the cover member 11 is fixed to the saw cover 4 by providing a hole 11b in the fixing portion 11a of the cover member 11, and by providing a screw hole 13 in the saw cover 4 as shown in FIG. 1, the screw 16 is passed through the hole 11 b of the fixing portion 11 a and screwed into the screw hole 13 provided in the saw cover 4.

  Thus, the fan air 9 discharged from the outlet 12 of the saw cover 4 to the outside of the saw cover 4 passes through the discharge path 14 inside the cover member 11 and is discharged from the open end 17 of the cover member 11. The fan air 9 from the open end 17 of the cover member 11 is discharged toward the front side in the cutting direction of the base 5, and the chips accumulated on the upper part of the base 5 and the workpiece to be cut in front of the base 5 Blow away.

  In addition, a guide piece 10 having a guide portion 10a indicating the cutting edge position of the saw blade 1 is installed at the front end portion of the base 5 in the cutting direction so that the fan air 9 is discharged to a range including the guide portion 10a. It has become.

  As described above, according to the portable circular saw according to the present invention, the discharge path 14 of the fan wind 9 generated by the rotation of the fan 7 is formed along the outer peripheral surface of the saw cover 4, and the fan wind 9 is discharged to the discharge path. 14, the base 5 is discharged toward the front side in the cutting direction. Therefore, a groove is formed on the bottom surface of the base 5 so that the strength of the base 5 is not reduced. Chips on the material to be cut can be blown away, and the visibility of the marking lines on the material to be cut can be improved to improve workability.

  Further, the workability can be improved with a simple configuration by simply attaching the cover member 11 which is a discharge path forming member to the saw cover 4, and the discharge path 14 can be formed in an existing product with almost no processing. The effect can be obtained.

  Furthermore, since the cover member 11 that is a discharge path forming member is formed in a shape along the saw cover 4, this may interfere with the visibility of the cutting edge of the saw blade 1. Absent.

  In the present embodiment, as shown in FIG. 5, the fan air 9 is discharged into the saw blade storage portion 4a and a part thereof is discharged into the discharge passage 14 via the discharge port 12. Since the cooling air 9 is also discharged into the saw blade storage portion 4a, the generation of noise due to the fan wind 9 can be suppressed, but the discharge in the cover member 11 is not discharged into the saw blade storage portion 4a. It is good also as a structure discharged | emitted only to the path 14. FIG.

  Further, by providing an air volume adjusting means for adjusting the opening area of the discharge port 12 and an air volume adjusting means for adjusting a partial cross-sectional area in the discharge path 14, the air is discharged toward the front end in the cutting direction of the base 5. It is also possible to adjust the air volume of the fan air 9 according to the work situation and the like, thereby further improving the workability. In this case, in the operation in an environment where it is not desired to blow off the chips by configuring the air volume adjusting means so as to be able to block the opening area of the discharge port 12 or a partial cross-sectional area in the discharge path 14, for example. The discharge of the fan wind 9 from the discharge path 14 can be restricted, and a portable circular saw with good workability according to the work situation or the like can be provided.

  In addition, the portable circular saw usually has a configuration in which the base 5 is inclined with respect to the saw cover 4 or the motor housing 3, and the angle of the side surface of the saw blade 1 with respect to the bottom surface of the base 5 can be adjusted to be inclined, that is, the inclination. Although it is configured to be capable of cutting, since the discharge path 14 is arranged on the longitudinal extension line of the saw blade 1 along the saw cover 4 as in the above-described embodiment, a fan can be used even during inclined cutting. The wind 9 is discharged to the front side in the cutting direction, and the chips on the cut line of the material to be cut can be blown away.

  Further, since the discharge port 12 of the saw cover 4 is formed between the saw blade storage portion 4a of the saw cover 4 and the base of the handle 15, the portion covering the discharge port 12 of the cover member 11 becomes a shadow of the base of the handle 15, It doesn't get in the way to grab 15

  Further, the portion of the cover member 11 that covers the blade storage portion 4a of the saw member 4 is covered with an arc shape so that the saw blade storage portion 4a of the saw cover 4 covers the blade edge of the saw blade 1 with an arc-shaped outer wall. It will not grow.

  In the above-described embodiment, the discharge path forming member is constituted by the cover member 11 configured to form the discharge path 14 partitioned by the outer wall of the saw cover 4 by a member having a U-shaped cross section. It is good also as what has the shape which has the discharge path divided inside only by the discharge path formation member.

  Further, the saw cover 4 itself may be configured to form part or all of the discharge path. In this case, it is desirable that the saw cover 4 be of a divided type.

  Further, in the case of a portable circular saw with a light having a light that irradiates the cutting edge front part or the cutting edge part of the saw blade 1 in front of the cutting direction and a light holder that holds the light, a discharge path is formed in the light holder. If it also serves as a function, workability can be further improved without increasing the number of parts.

  In the above embodiment, the cover member 11 that is the discharge path forming member is fixed to the saw cover 4 with the screw 16. However, the cover member 11 is fixed to the product with an adhesive, or the cover member 11 is fitted into the saw cover 4. A configuration in which the cover member 11 is fixed without using a screw, such as a configuration in which the cover member 11 is fixed by providing a portion, may be adopted.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  9 is a side view showing a part of the cover member of the portable circular saw according to the second embodiment of the present invention, and FIG. 9 is a sectional side view of the portable circular saw, and FIG. 10 is the portable circular saw. It is a bottom view of a saw, In these figures, the same code | symbol is attached | subjected to the same element as what was shown in FIGS. 1-7, and description about them is abbreviate | omitted below.

  As shown in FIGS. 8 and 10, the portable circular saw according to the present embodiment includes a laser oscillator 18 that oscillates the laser beam L that guides cutting toward the front side in the cutting direction of the material to be cut. The other arrangement is the same as that of the portable circular saw according to the first embodiment.

  Since the laser light L oscillated from the laser oscillator 18 exhibits high straightness, the laser oscillator 18 is positioned at the position where the laser light L is irradiated on the cutting extension line of the material to be cut, specifically the saw blade 1 and Although it arrange | positions in the position which overlaps (position on the surface parallel to the end surface of the saw blade 1), the width direction position in the discharge path 14 is adjustable. That is, as shown in FIG. 10, the laser oscillator 18 is urged in the width direction (leftward in FIG. 10) by a spring 19, and its end surface is received by an adjustment bolt 20 that is screwed into a side portion of the cover member 11. It has been. Therefore, the position of the laser oscillator 18 in the width direction in the discharge path 14 can be adjusted by turning the adjustment bolt 20 and moving it forward and backward in the discharge path 14. As shown in FIG. 9, the lead wire 21 for supplying current to the laser oscillator 18 extends to the discharge path 14 in the cover member 11 through the discharge port 12 formed in the saw cover 4, and its end portion is A laser oscillator 18 is connected.

  Thus, the morphological circular saw according to the present embodiment can achieve the same effect as that of the first embodiment, but in this embodiment, the laser oscillator 18 is arranged in the discharge path 14 as described above. As a result, the laser oscillator 18 is exposed to the fan air 9 flowing through the discharge path 14 so that chips do not easily adhere to the fan wind 9, and as a result, the cut portion on the material to be cut can be kept in a highly visible state. .

  Further, since the laser oscillator 18 is cooled by the fan air 9, its heat generation is suppressed, and a reduction in luminance is prevented. Further, as a result of preventing the luminance of the laser oscillator 18 from being lowered, the luminance required for the laser oscillator 18 is kept low, thereby reducing power consumption and reducing power consumption. The cost can be reduced by using a low-priced and low-priced one. When a battery is used as the power source of the laser oscillator 18, an effect that the battery life is extended by power saving can be obtained.

  By the way, in this Embodiment, although the laser oscillator was used as a light emission part which irradiates the light which guides cutting | disconnection toward the cutting direction front side of a to-be-cut | disconnected material, you may replace with this and may use an LED light emission part. The straightness of the LED light is not as high as that of the laser light, and the irradiation range has a certain width. Therefore, the mounting position of the LED light emitting unit may not be as strict as the laser oscillator. A slight deviation in the width direction from the overlapping position is allowed.

  In the present embodiment, the laser oscillator 18 is arranged in the discharge path 14, but the same effect as described above can be obtained even if it is arranged in the discharge path of the fan wind 9 outside the discharge path 14.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 11 is a side sectional view of a jigsaw according to Embodiment 3 of the present invention.

  In the present embodiment, the present invention is applied to a jigsaw. First, the basic configuration and operation of the jigsaw will be described below.

  In the illustrated jigsaw housing 31, an electric motor 32 as a drive source is accommodated horizontally, and a pinion 34 is integrally engraved at one end of an output shaft (motor shaft) 33 of the electric motor 32. A fan 35 is mounted on the output shaft inside the pinion 34.

  A shaft 36 is disposed above and parallel to the output shaft 33 of the electric motor 32 in the housing 31, and a gear 37 is rotatably supported on the shaft 36. It meshes with the pinion 34 formed at the end. A pin 38 eccentric to the shaft 36 is attached to the gear 37, and the pin 38 is engaged with a sleeve guide 39.

  The sleeve guide 39 is attached to the plunger 40 so as to be reciprocated in the vertical direction in the housing 31, and the upper end of a blade 41 that is long in the vertical direction is detachably attached to the plunger 40. The blade 41 extends downward from the lower surface of the base 42 through an opening (not shown) formed in the base 42 attached horizontally to the lower portion of the housing 31.

  Thus, when the motor 32 is driven, the rotation of the output shaft 33 is decelerated via the pinion 34 and transmitted to the gear 37, and the gear 37 rotates at a predetermined speed around the shaft 36. The rotation of the gear 37 is converted into the vertical reciprocating linear motion of the plunger 40 and the blade 41 connected thereto by the eccentric motion of the pin 38. Accordingly, if the jigsaw is moved in a state where the base 42 is placed on a material to be cut (not shown), the material to be cut is cut by the blade 41 that reciprocates linearly up and down. At this time, the fan 35 attached to the output shaft 33 of the electric motor 32 is rotationally driven, and the fan air 43 induced by the fan 35 flows in the direction of the arrow in the housing 31 to cool the electric motor 32.

  Incidentally, also in the jigsaw according to the present embodiment, a part of the fan air 43 is directed forward in the cutting direction of the base 42 between the inside of the housing 31 and between the housing 31 and the cover member 44 attached thereto. A discharge path 45 for discharging is formed, and inside the discharge path 45 and in the vicinity of the opening, the laser beam L for guiding the cutting is directed forward in the cutting direction of the material to be cut. A laser oscillator 46 for irradiation is arranged.

  Therefore, also in the jigsaw according to the present embodiment, a part of the fan air 43 used for cooling the electric motor 32 flows through the discharge passage 45 in the direction of the arrow in the drawing and is discharged toward the front side in the cutting direction of the base 42. Therefore, the chips on the cutting material on the front side in the cutting direction of the base 42 can be blown away without causing a reduction in the strength of the base 42 by forming a groove on the bottom surface of the base 42. It is possible to improve the workability by increasing the visibility of the upper marking line.

  Further, similarly to the second embodiment, since the laser oscillator 46 is disposed in the discharge path 45, chips are less likely to adhere to the laser oscillator 46, and the cut portion on the material to be cut is kept in a highly visible state. Can do. Further, since the laser oscillator 46 is cooled by the fan air 43, the heat generation is suppressed, the luminance is prevented from lowering, the power consumption is reduced to save power, and the laser oscillator 46 has a low heat-resistant temperature and low cost. The cost can be reduced by using a new one.

  In this embodiment as well, the laser oscillator is used as the light emitting unit that emits the light for guiding the cutting toward the front side in the cutting direction of the material to be cut, but an LED light emitting unit may be used instead. .

  Also in the present embodiment, the laser oscillator 46 is disposed in the discharge path 45, but the same effect as described above can be obtained even if it is disposed in the discharge path of the fan air 43 outside the discharge path 45.

  The present invention can be applied to any portable electric cutting machine such as a portable circular saw or a jigsaw that employs a system in which an electric motor housed in a housing is cooled by a fan wind generated by the rotation of the fan.

It is a perspective view of the portable circular saw which concerns on Embodiment 1 of this invention. It is a perspective view which shows the state which removed the cover member of the portable circular saw which concerns on Embodiment 1 of this invention. It is an upper surface perspective view of the cover member of the portable circular saw which concerns on Embodiment 1 of this invention. It is a bottom perspective view of the cover member of the portable circular saw according to Embodiment 1 of the present invention. It is a fracture | rupture side view of the portable circular saw which concerns on Embodiment 1 of this invention. It is a front side perspective view which fractures | ruptures and shows a part of cover member of the portable circular saw which concerns on Embodiment 1 of this invention. It is a bottom perspective view of the portable circular saw according to Embodiment 1 of the present invention. It is a side view which fractures | ruptures and shows a part of cover member of the portable circular saw which concerns on Embodiment 2 of this invention. It is a fracture | rupture side view of the portable circular saw which concerns on Embodiment 2 of this invention. It is a bottom view of the portable circular saw which concerns on Embodiment 2 of this invention. It is a sectional side view of the jigsaw which concerns on Embodiment 3 of this invention. It is a fracture | rupture top view of the conventional portable circular saw. It is a back side bottom perspective view of the conventional portable circular saw.

Explanation of symbols

1 Saw Blade 2 Electric Motor 3 Motor Housing (Housing)
DESCRIPTION OF SYMBOLS 4 Saw cover 4a Saw blade storage part of a saw cover 5 Base 5a Base opening 6 Safety cover 7 Fan 8 Suction port 9 Fan air 10 Guide piece 10a Guide part of guide piece 11 Cover member (discharge path forming member)
12 Saw cover fan air outlet 13 Screw hole 14 Discharge path 15 Handle 16 Screw 17 Open end 18 Laser oscillator (light emitting part)
19 Spring 20 Adjustment bolt 21 Lead wire 31 Housing 32 Electric motor 33 Output shaft (motor shaft)
34 Pinion 35 Fan 36 Shaft 37 Gear 38 Pin 39 Sleeve guide 40 Plunger 41 Blade (sawtooth)
42 Base 43 Fan wind 44 Cover member (discharge path forming member)
45 Discharge path 46 Laser oscillator (light emitting part)
L Laser light

Claims (8)

A housing that houses an electric motor that drives the saw blade to rotate;
A saw cover attached to the housing, having a shape covering substantially the upper half of the outer periphery of the saw blade, and having a saw blade storage portion for storing a part of the saw blade;
A base connected to at least one of the saw cover or the housing and formed with an opening for projecting the saw blade downward from a bottom surface slidable on a cutting material;
A fan provided in the housing and driven to rotate by the electric motor;
In the portable electric cutting machine with
A discharge path for discharging at least a part of the fan wind generated by the rotation of the fan is formed by the outer periphery of the saw cover and the inside of a discharge path forming member attached to the saw cover, and the fan wind is passed through the discharge path. A light emitting unit that emits light toward the front side in the cutting direction of the material to be cut is disposed in the discharge path or the fan wind discharge path outside the discharge path while discharging toward the front side in the cutting direction of the base. A portable electric cutting machine.   The portable electric cutting machine according to claim 1, wherein the light emitting unit is constituted by a laser oscillator.   3. The portable electric cutting machine according to claim 2, wherein the laser oscillator is disposed at a position where the laser beam oscillated from the laser oscillator is irradiated on a cutting extension line of the material to be cut.   The portable electric cutting machine according to claim 1, wherein a discharge path forming member for forming the discharge path is attached to the saw cover.   The portable electric cutting machine according to claim 4, wherein the discharge path forming member is attached to the saw cover so as to cover at least a part of the fan air discharge port formed on the outer peripheral portion of the saw cover.   6. The portable electric cutting machine according to claim 4, wherein the discharge path forming member is a cover member that forms the discharge path with an outer peripheral surface of the saw cover.   The portable electric cutting machine according to any one of claims 1 to 6, wherein a part of the discharge path is formed to extend on a longitudinal extension line of the saw blade.   The portable electric cutting machine according to any one of claims 1 to 7, wherein the fan wind discharged from the discharge path is discharged toward the front side from the front end portion in the cutting direction of the base.

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