JPH0929707A - Bench circular saw machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the influence of wind blowing from a safety cover to the flow of collected cutting wastage. SOLUTION: The sectional shape of a circular arc-like bottom 18 along the cutting edge circle of a saw blade 8 in the circumferential direction becomes a bent part 19 formed toward the cutting edge side of the blade 8 in the opening 17 of a safety cover 16. Thus, the wind generated by rotation of the blade 8 is deflected to blow to the axial center side of the blade 8 as indicated by an arrow (b) by the part 19. Accordingly, the duct correcting efficiency is not lowered without interfering with the dust collecting passage (arrow (a)) of the cutting wastage from a material W to be cut to a cylindrical part 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a body provided with a saw blade, which is movable up and down, and a safety cover which covers the saw blade at an upper limit position of the body and rotates as the body descends to expose the saw blade. It relates to a tabletop circular saw.

[0002]

2. Description of the Related Art As an example of a table-top circular saw machine, an actual Kaihei 3-1
The one disclosed in Japanese Patent No. 08401 is shown in FIG. this is,
A main body 30 having a saw blade 31 and pivotally attached to an arm 32 so as to be vertically movable is provided with a safety cover 33 having an arc-shaped bottom surface along the cutting edge circle of the saw blade 31.
3 rotates counterclockwise along with the lowering of the main body 30 at the time of cutting to expose the saw blade 31. Further, here, as a dust collecting mechanism for preventing the diffusion of cutting waste and efficiently collecting dust, the main body 30 is provided with a guide plate 34 rotatable about the axis of the saw blade 31. Therefore, the cutting chips scattered rearward in the tangential direction of the saw blade 31 at the time of cutting are guided by the guide plate 34 into the blade case 30a as indicated by a dotted arrow,
From there, it will be collected in a dust bag 35 or the like.

[0003]

In the above-mentioned table-top circular saw machine, the wind generated by the rotation of the saw blade 31 and the wind from the motor cooling fan spread from the inside of the blade case 30a to the inside of the safety cover 33. Although it will be blown out in the direction of the arrow c, this wind interferes with the scattering path of the cutting debris guided from the material W to be cut to the dust collecting bag 35 by the guide plate 34, thereby obstructing the flow of the cutting debris. Reduces the dust collection efficiency. This interference is particularly noticeable at the beginning of cutting of the material to be cut or when the material to be cut has a thin plate thickness, which is an obstacle to dust collection.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention provides a table-top circular saw machine which can maintain a suitable dust collecting effect without being disturbed by the wind blown from the safety cover side.
On the bottom surface of the opening of the safety cover on the exposed side of the saw blade, a deflecting portion is provided for discharging the wind blown along the bottom surface by the rotating saw blade in the direction away from the dust collecting path from the material to be cut to the dust collecting mechanism. It is characterized by that. Further, the deflecting portion can be formed by bending the edge portion of the bottom face toward the blade tip side of the saw blade. Further, the deflecting portion can be formed by a protruding portion provided on the bottom surface. In addition, the deflection unit,
It can be formed by a through hole formed in the bottom surface and a guide portion for guiding the wind to the through hole.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a table circular saw 1, in which an arm 4 is provided behind a turntable 3 rotatably mounted on a base 2 (the right side of FIG. A main body 6 is pivotally attached to the upper end of the arm 4 by a support shaft 5 so as to be vertically movable. The main body 6 is rotated by a motor (not shown), and is provided with a disk-shaped saw blade 8 that is worn on the blade case 7 above and a handle 9, and a compression spring 10 provided at a base end portion 7 a of the blade case 7 is used. , Is biased upward.
Further, the arm 4 integrally has a horizontal cylindrical portion 11 that communicates the front and rear thereof, and a curved front surface portion 12 is formed in front of the cylindrical portion 11 while being installed on the upper surface of the turntable 3. The curved portion 14 of the guide rule 13 is formed so as to be inclined toward the curved surface portion 12 so that cutting waste can be suitably guided to the cylindrical portion 11. Further, a guide member 15 having a U-shaped cross section is integrally attached to the lower portion of the base end portion 7a so that cutting waste scattered at an upward angle can also be guided to the cylindrical portion 11. 16 in the main body 6 is a saw blade 8
A safety cover pivotally attached to the blade case 7 at substantially the same position as the shaft center of the main body 6, and at the upper limit position of the main body 6, covers approximately half of the saw blade 8 as shown in FIG. Accordingly, the link plate 20 connected between the support arm 4a of the arm 4 and the blade case 7 rotates counterclockwise to expose the saw blade 8, but especially the opening 17 on the side of the link plate 20. In, as shown in FIG.
The circular cross-sectional shape of the arc-shaped bottom surface 18 along the blade edge circle of the saw blade 8 is a bent portion 19 as a deflecting portion that bends toward the blade edge side of the saw blade 8.

In the tabletop circular saw machine 1 constructed as described above, when the handle 9 is gripped and the main body 6 is lowered, the safety cover 16 is rotated by the link plate 20 and the saw blade 8 is exposed. Thus, the material W to be cut placed on the turntable 3 can be cut. The cutting chips scattered in the direction of the arrow a at the time of cutting are directly or in the guide member 15 or the bending portion 1.
4, guided by the curved surface portion 12 and the like, jumps into the cylindrical portion 11 and is discharged to the rear of the arm 4 as it is, or is collected by a dust collecting bag connected to the cylindrical portion 11 or a dust collector connected via a hose. Or And at this time,
By the rotation of the saw blade 8 or from the motor cooling fan, a clockwise wind is generated in the blade case 7 along the cutting edge circle of the saw blade 8, and this wind is opened along the bottom surface 18 of the safety cover 16. Although it is blown out from 17, the direction of this wind is deflected toward the axial center side from the circumferential direction of the saw blade 8 as shown by the arrow b by the bent portion 19 provided in the opening 17, and is discharged. Therefore, since it does not interfere with the dust collecting path for the cutting waste from the material W to be cut to the cylindrical portion 11 indicated by the arrow a, the dust collecting efficiency is not affected.

The cross-sectional shape of the bottom surface 18 of the safety cover 16 can be various other than the above as long as the direction of the wind from the opening 17 can be changed. For example, as shown in FIG. 4, if a triangular protrusion 21 with the center as the apex is formed on the bottom face of the opening, the blowing air is separated to both sides of the protrusion 21 as shown by an arrow in the figure, and the material is cut right behind, that is, the material to be cut. It can be prevented from flowing to the W side. Also, this may be blown out in either direction. In the shape of FIG. 2 further ahead, if a plurality of through holes 22, 22 are obliquely formed at a position before the bent portion 19 (FIG. 5), the bent portion 19 will be blown with wind when cutting in FIG. In addition to being deflected, it is also guided to the through holes 22 and 22 so that it is blown out substantially right below, so that the amount of backward blowing can be reduced. In particular, here, instead of the bent portion 19, FIG.
If the guide part 23 mainly for guiding the wind is formed as
The amount blown out from the through holes 22, 22 is increased. Further, the ends of the bent portion 19 and the guide portion 23 are fixed to the outer peripheral side of the blade edge of the saw blade 8, but the saw blade passing portion may be cut out in a U shape or the like to extend beyond the blade edge. It is possible, and the bent portion 19 may be combined with the protrusion 21. The present invention is also applicable to a slide-type table-top circular saw machine in which the main body is slidably movable in the front-rear direction.

[0008]

As described above, according to the present invention, the wind blown out from the safety cover does not interfere with the dust collecting path of the cutting waste, so that the scattering of the cutting waste can be prevented and the good dust collecting efficiency can be maintained, especially at the start of cutting. It is effective when it is susceptible to the wind blown from the safety cover, such as a material to be cut or a thin plate. Further, if the deflecting portion is formed by bending the edge portion of the bottom face toward the blade tip side of the saw blade, the blowing air can be deflected toward the axial center side of the saw blade. Further, if the deflecting portion is formed by a protruding portion provided on the bottom surface, the blowing air can be deflected in the left-right direction. Further, if the deflecting portion is formed by a through hole formed in the bottom surface and a guide portion that guides the wind to the through hole, the blowing air can be deflected in the direction of forming the through hole.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a table circular saw machine.

FIG. 2 is an explanatory diagram of a deflecting portion of a safety cover.

FIG. 3 is an explanatory diagram showing a state when the tabletop circular saw machine is cut.

FIG. 4 is an explanatory diagram showing another form of the deflecting unit.

FIG. 5 is an explanatory diagram showing another form of the deflecting unit.

FIG. 6 is an explanatory diagram showing another form of the deflection unit.

FIG. 7 is an explanatory diagram of a conventional table-top circular saw machine.

[Explanation of symbols]

1 ... Desk top circular saw, 2 ... Base, 3 ... Turntable, 4 ... Arm, 6 ... Main body, 7 ... Blade case, 8 ... Saw blade, 11 ... Cylindrical part, 15 ... Induction member,
16 ... Safety cover, 17 ... Opening, 18 ... Bottom surface, 1
9 ... Bending part, 21 ... Projection, 22 ... Through hole, 23 ...
Guidance section.

Claims (4)

[Claims] 1. A body having a saw blade, which can be moved up and down, has an arcuate bottom surface along a cutting edge circle of the saw blade, and covers the saw blade at an upper limit position of the body to lower the body. While equipped with a safety cover that rotates with it to expose the saw blade, in a tabletop circular saw machine equipped with a dust collection mechanism that collects cutting waste generated during cutting work, at the bottom surface of the opening on the saw blade exposed side of the safety cover. A table-top circular saw machine provided with a deflecting portion for discharging wind blown along the bottom surface by a rotating saw blade in a direction away from a dust collecting path from the material to be cut to the dust collecting mechanism. 2. The table-top circular saw machine according to claim 1, wherein the deflecting portion is formed by bending the edge of the bottom face toward the blade tip side of the saw blade. 3. The table-top circular saw machine according to claim 1, wherein the deflecting portion is formed by a protrusion protruding from the bottom surface. 4. The tabletop round according to claim 1, wherein the deflecting portion is formed of a through hole formed in the bottom surface and a guide portion for guiding the wind to the through hole. Saw machine.