JP2014161935A - Portable cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable cutting machine which can improve dust collection performance of chips without utilizing motor cooling wind for dust collection of the chips.SOLUTION: The portable cutting machine includes: a motor 13; a saw blade 14 which is rotated by the motor 13 and cuts a material to be cut; and a chip housing part 20 which is arranged on an upper part of the saw blade 14 and houses chips. The chip housing part 20 includes a housing chamber 25 as a housing space of the chips, and an introducing passage 26 communicating with the housing chamber 25. The introducing passage 26 includes an opening part which opens so as to face to an outer circumferential edge 14b of the saw blade 14, and a throttle part 26f formed in a middle part of the introducing passage 26 by putting front and back wall parts of the introducing passage 26 gradually closer to each other.

Description

  The present invention relates to a portable cutting machine provided with a chip storage portion that stores chips generated during cutting.

  Conventionally, a portable cutting machine having a dust collecting function has been used from the viewpoint of keeping the work site clean and preventing chips from being applied to the worker. As a portable cutting machine with a dust collection function, a portable cutting machine that is connected to a separate dust collector, or a portable cutting machine that is assumed to be used without a dust collector connected to the main body with a dust box etc. There is a cutting machine.

  Among these, as the latter type of portable cutting machine, one that winds up chips at the time of cutting a member by wind generated by the rotation of a saw blade and introduces the wound chips into a dust box is known. Moreover, in order to improve the dust collection performance of chips, a structure has also been proposed in which motor cooling air is guided to a cutting part or a chip introduction path and used for collecting dust (see Patent Document 1). .

JP 2011-131367 A

  However, if the motor cooling air is used for collecting dust as in the technique described in Patent Document 1 described above, there is a possibility that the chips may enter the motor cooling air path. There was a problem that could cause malfunction.

  Then, this invention makes it a subject to provide the portable cutting machine which can improve the dust collection performance of a chip, even if it does not utilize motor cooling air for the dust collection of a chip.

  The present invention has been made to solve the above-described problems, and is characterized by the following.

(Claim 1)
The invention described in claim 1 is characterized by the following points.
That is, the portable cutting machine according to claim 1 is provided with a motor, a saw blade that is rotated by the motor to cut a material to be cut, and an upper portion of the saw blade to accommodate chips. A chip accommodating portion, and the chip accommodating portion includes a storage chamber that is a space for storing chips, and an introduction path that leads to the storage chamber, and the introduction path is the saw blade. An opening is provided so as to face the outer peripheral edge, and a throttle portion is provided in the middle of the introduction path by gradually approaching the front and rear wall parts of the introduction path. .

(Claim 2)
The invention described in claim 2 has the following features in addition to the features of the invention described in claim 1 described above.
That is, the chip storage portion includes a chip discharge port for discharging the stored chip, and the wall portion on the side of the chip discharge port in the introduction path is formed with respect to the opening direction of the chip discharge port. It is characterized by being inclined.

(Claim 3)
The invention described in claim 3 is characterized by the following points in addition to the characteristics of the invention described in claim 1 or 2.
That is, the cross-sectional shape of the throttle portion of the introduction path is substantially triangular.

  The invention according to claim 1 is as described above, and the chip storage portion includes a storage chamber that is a storage space for chips and an introduction path that leads to the storage chamber. An opening portion is provided so as to face the outer peripheral edge of the blade, and a throttle portion is provided in the middle portion of the introduction path by gradually approaching the front and rear wall portions of the introduction path. For this reason, at the said opening part of the vicinity of a saw blade, it can open a large introduction path, and can collect chips efficiently, and the inflow speed of the chips to a storage chamber by the narrowing part provided in the middle part Can be raised. By increasing the flow rate of the chips, the chips flowing into the storage chamber are guided to the back of the storage chamber, so that the dust can be efficiently collected until the storage chamber is full.

  Since the storage room can be efficiently used in this way, the storage room can be made to a minimum size, and portability is not sacrificed. In addition, by improving the flow rate of chips, the position of the storage chamber can be separated from the saw blade, so there is no need to provide a storage chamber that blocks the line of sight around the saw blade, The cutting edge of the saw blade can be easily seen and the operability can be improved.

  In addition, since the throttle portion is formed by the front and rear wall portions that are gradually approached to increase the flow rate of the chips, the throttle portion is less likely to be clogged with chips.

  In addition, since it is not necessary to use the motor cooling air for dust collection of the chips, the air tightness around the motor can be improved, chips are not allowed to enter, and the dust and waterproof performance of the machine itself is maintained. be able to.

  Moreover, invention of Claim 2 is as above-mentioned, The said chip storage part is equipped with the chip discharge port for discharging | emitting the stored chip, The said chip discharge port side in the said introduction path The wall portion is inclined with respect to the opening direction of the chip discharge port. According to such a configuration, the chips remaining in the introduction path slide down by, for example, shaking the portable cutting machine with the chip discharge port down when discharging the chips in the chip container, Chip removability can be improved.

  In addition, the invention according to claim 3 is as described above, and the cross-sectional shape of the throttle portion of the introduction path is substantially triangular, so that the throttle portion can be less likely to be clogged with chips, and the chips are discharged. It is possible to improve the removal property of the chips when performing.

It is a side view of a portable cutting machine. It is a perspective view of the portable cutting machine which removed the dust box. It is a side view of the portable cutting machine which removed the dust box. (A) AA sectional drawing in FIG. 1, (b) It is an enlarged view of the X section. (A) BB sectional drawing in FIG. 1, (b) It is an enlarged view of the Y section. (A) CC sectional drawing in FIG. 1, (b) It is an enlarged view of the Z section. It is DD sectional drawing in FIG. It is a side view of the portable cutting machine which opened the discharge lid part.

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the portable cutting machine 10 according to the present embodiment includes a cutting machine body 11 that rotatably supports a saw blade 14, and a base 19 is attached to the lower part of the cutting machine body 11. Is. The cutting machine main body 11 includes a motor housing 12 having a built-in motor 13, and the saw blade 14 is driven to rotate by operating the motor 13, so that the material to be cut can be cut. The motor 13 operates with a battery 18 detachably attached to a battery mounting portion 17 provided at the rear of the cutting machine body 11 as a drive source.

  A grip 15 is provided on the upper portion of the cutting machine main body 11 substantially in parallel with the cutting direction of the saw blade 14. By pulling a trigger 16 provided inside the grip 15, the motor 13 is rotated. Yes.

  The base 19 is a metal plate-like member that comes into contact with the material to be cut, and the material to be cut is cut below the base 19 by exposing a part of the saw blade 14 from the blade opening 19a formed therethrough. It is formed to be able to.

  On the upper part of the saw blade 14, there is provided a chip accommodating portion 20 for accommodating the chips. The chip accommodating portion 20 includes a saw blade cover 21 that covers the upper portion of the saw blade 14, and a dust box 22 that is attached to the outside of the saw blade cover 21. In addition, the member which comprises the chip accommodating part 20 does not necessarily need to be plural, and you may comprise the chip accommodating part 20 with the member formed integrally.

  As shown in FIGS. 2 and 3, the saw blade cover 21 includes a groove portion 21 a formed substantially vertically. The groove portion 21 a is provided at a position directly above the front end of the saw blade 14 and opens so as to face the outer peripheral edge 14 b of the saw blade 14.

  When the dust box 22 is attached to the saw blade cover 21, the introduction path 26 is formed by covering the side portion of the groove portion 21a. The introduction path 26 is a passage that leads to a storage chamber 25 that is a space for storing chips. The introduction path 26 uses four wall portions including a front wall portion 26 b, a rear wall portion 26 c and a side wall portion 26 d formed by the groove portion 21 a of the saw blade cover 21, and a side wall portion 26 e formed by the dust box 22. Is formed. As will be described later, the introduction path 26 has a substantially square cross section at the lower part (opening side) and a substantially triangular cross section at the upper part (accommodation chamber 25 side).

  When the material to be cut is cut by the saw blade 14, the generated chips are introduced from the opening 26 a of the introduction path 26 into the introduction path 26 along the rotation direction of the saw blade 14. The chips enter the storage chamber 25 through the introduction path 26 and are stored in the storage chamber 25. The storage chamber 25, which is a space for storing chips, is a space that is formed in the dust box 22 and has a substantially semicircular shape when viewed from the side. As shown in FIG. It is arranged in communication with.

  Meanwhile, as shown in FIG. 3, the introduction path 26 according to the present embodiment is provided with a throttle part 26 f in the middle part. The narrowed portion 26f is formed by gradually approaching the front and rear wall portions. In the present embodiment, as shown in FIGS. 4 to 6, one side of the rear wall portion 26 c is inclined so as to approach the front wall portion 26 b, and one side of the rear wall portion 26 c and the front side are arranged in the throttle portion 26 f. The wall 26b is joined to one side. For this reason, the introduction path 26 forms an inclined portion so that the cross-sectional area gradually decreases as it goes upstream in the chip accommodation direction.

  FIG. 6B is a diagram illustrating a cross-sectional shape of the introduction path 26 in the vicinity of the throttle portion 26f. As shown in FIG. 6B, in the throttle part 26f, the front wall part 26b and the rear wall part 26c are continuous on one side, and the side wall part 26d does not exist. As described above, the introduction path 26 has a substantially square cross section due to the front wall part 26b, the rear wall part 26c, the side wall part 26d, and the side wall part 26e in the vicinity of the opening 26a, but the front wall part 26b in the throttle part 26f. The rear wall portion 26c and the side wall portion 26e have a substantially triangular cross-sectional shape.

  Since the throttle part 26f is thus provided, the chips passing through the introduction path 26 have a high flow velocity at the throttle part 26f and flow into the storage chamber 25 vigorously, so that the chips are guided to the back of the storage chamber 25. It is like that.

  As described above, although the rear wall portion 26c is inclined in the present embodiment, the front wall portion 26b is formed so as to be substantially parallel to the shaft 14a of the saw blade 14 without being inclined. . By not tilting the front wall portion 26b in this way, the chips can pass through the introduction path 26 smoothly along the front wall portion 26b.

  Moreover, the chip accommodating part 20 is provided with the chip discharge port 20a for discharging | emitting the accommodated chip as shown in FIG.1 and FIG.8. When discharging the chips, the discharge lid 23 behind the dust box 22 is opened, and the chips stored in the storage chamber 25 are dropped with the opening direction D of the chip discharge port 20a facing downward. At this time, since the rear wall portion 26c is inclined, it is easy to discharge the chips remaining in the introduction path 26. That is, since the rear wall portion 26c, which is the wall portion on the chip discharge port 20a side in the introduction path 26, is inclined with respect to the opening direction D of the chip discharge port 20a, the remaining chips in the introduction path are It slides down on the wall 26c and is discharged.

  As described above, according to the present embodiment, the chip storage unit 20 includes the storage chamber 25 that is a chip storage space and the introduction path 26 that leads to the storage chamber 25, and the introduction path 26 is provided with an opening 26a that is open so as to face the outer peripheral edge 14b of the saw blade 14, and when the front and rear wall portions of the introduction path 26 gradually approach each other, a throttle portion is provided in the middle of the introduction path 26. 26f is provided. For this reason, in the vicinity of the saw blade 14, the introduction path 26 can be greatly opened to collect the chips efficiently, and the flow rate of the chips into the storage chamber 25 by the throttle part 26 f provided in the middle part. Can be raised. By increasing the inflow rate of the chips, the chips flowing into the storage chamber 25 are guided to the back of the storage chamber 25, so that the dust can be efficiently collected until the storage chamber 25 is full.

  Since the storage chamber 25 can be efficiently used in this way, the storage chamber 25 can be reduced to a minimum size, and portability is not sacrificed. Moreover, since the position of the storage chamber 25 can be moved away from the saw blade 14 by improving the flow rate of chips, the storage chamber 25 is provided around the saw blade 14 to block the line of sight. There is no need, and the cutting edge of the saw blade 14 can be easily recognized, and the operability can be improved.

  Further, since the narrowed portion 26f is formed by the front and rear wall portions that are gradually approached to increase the flow rate of the chips, the narrowed portion 26f is less likely to be clogged with chips.

  Further, since it is not necessary to use the motor cooling air for dust collection of the chips, the airtightness around the motor 13 can be improved, the chips are not allowed to enter, and the dustproof performance and waterproof performance of the machine itself are maintained. can do.

  Moreover, the said chip accommodating part 20 is provided with the chip discharge port 20a for discharging | emitting the accommodated chip, and the wall part by the side of the said chip discharge port 20a in the said introduction path 26 is set to the said chip discharge port 20a. It is inclined with respect to the opening direction. According to such a configuration, when the chips in the chip storage unit 20 are discharged, the chips remaining in the introduction path 26 by shaking the portable cutting machine 10 with the chip discharge port 20a down. Since it slides down, the removal property of chips can be improved.

  Moreover, since the cross-sectional shape in the said narrowing part 26f of the said introduction path 26 was made into the substantially triangular shape, it can make it hard to clog a chip | tip in the narrowing part 26f, and improves the removability of the chip when discharging a chip. be able to.

  In the present embodiment, the throttle part 26f of the introduction path 26 is formed by inclining the rear wall part 26c of the groove part 21a, and the sectional shape of the throttle part 26f is substantially triangular. However, the present invention is not limited to this. For example, in addition to inclining the rear wall part 26c, or instead of inclining the rear wall part 26c, the front wall part 26b may be inclined to form the throttle part 26f of the introduction path 26. The cross-sectional shape of the narrowed portion 26f formed in this way may be a substantially triangular shape different from that shown in FIG.

DESCRIPTION OF SYMBOLS 10 Portable cutting machine 11 Cutting machine main body 12 Motor housing 13 Motor 14 Saw blade 14a Shaft 14b Outer peripheral edge 15 Grip 16 Trigger 17 Battery mounting part 18 Battery 19 Base 19a Blade edge 20 Chip accommodating part 20a Chip discharge opening 21 Blade cover 21a Groove part 22 Dust box 23 Discharge lid part 25 Storage chamber 26 Introduction path 26a Opening part 26b Front wall part 26c Rear wall part 26d, 26e Side wall part 26f Restriction part D Opening direction of chip discharge port (chip discharge direction)

Claims (3)

A motor,
A saw blade that is rotated by the motor to cut the workpiece;
A chip accommodating part for accommodating the chips disposed on the upper part of the saw blade;
With
The chip storage unit has a storage chamber that is a storage space for chips, and an introduction path that leads to the storage chamber.
The introduction path is provided with an opening that opens so as to face the outer peripheral edge of the saw blade, and a throttle part is provided in the middle of the introduction path as the front and rear wall portions of the introduction path gradually approach each other. A portable cutting machine, characterized in that The chip storage unit includes a chip discharge port for discharging the stored chip,
The portable cutting machine according to claim 1, wherein a wall portion on the chip discharge port side in the introduction path is inclined with respect to an opening direction of the chip discharge port.   The portable cutting machine according to claim 1 or 2, wherein a cross-sectional shape of the throttle portion of the introduction path is substantially triangular.

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