JPH0788010B2 - Ring saw - Google Patents

Description

Description: [Object of the invention] (Field of industrial application) The present invention relates to a ring saw capable of performing a deep cutting process on an object to be cut, such as when cutting Otani stone. .

(Prior Art) As a saw-shaped cutter used for cutting out stone materials and other cutting, a circular saw in which a cutting blade is provided around the disk and the center of the disk is fixed to the output shaft of the motor is the most common. Is.

However, since the output shaft of the motor is fixed to the center of the disk in this circular saw, it is not possible to make a cut with a depth greater than the radius of the disk in the object to be cut, which is not suitable for cutting large stone materials. Appropriate.

On the other hand, a chain saw is known as a saw capable of making deep cuts, and like the circular saw, it is also used for cutting out stone materials and cutting large-diameter wood.

In this chainsaw, the chain is hung on the outer circumference of the guide plate that extends like a tongue from the drive part of the motor or engine, and the blade is cut by the blade provided on the outer circumference of the guide plate. It is possible to make deeper cuts in the cut.

However, in the chainsaw as described above, the guide plate and the chain hung on it cannot be inserted into the cut unless the width of the blade is greater than the width of the chain. Need to be wide. As a result, the larger the width of the blade, the greater the amount of material to be cut during the cutting work, so a large amount of cutting chips (swarf) are generated, and a large driving force is required and the cutting speed is slow. there were.

The applicant has proposed a ring saw as described below in order to solve the problems of the conventional circular saw and chain saw as described above.

That is, in the ring saw of the applicant, as shown in FIGS. 3 and 4, the ring 3 is arranged outside the disk-shaped frame 2 arranged in the central portion of the ring saw 1. Further, recesses 4 are formed in at least three locations on the outer peripheral side surface of the frame 2, and guide wheels 5 are inserted therein. An outer peripheral side surface V-shaped groove 6 is formed in the guide boiler 5, and the inner peripheral portion of the ring 3 is fitted in the V-shaped groove 6, while the other end of the guide wheel 5 is connected to the frame 2. It is fixed with screws.

Further, one end of a motor bracket 7 that supports the entire ring saw 1 is attached to the upper portion of the frame 2, and a drive unit including a motor 8 and a bevel gear 9 is disposed at the other end of the bracket 7. On the other hand, on one surface of the ring 3, a gear 10 that meshes with the bevel gear 9 is formed in a circumferential shape.

In the ring saw configured in this manner, since the ring-shaped blade is a rigid body, which is different from the blade used in the chainsaw, there is no need for a guide plate or a chain, and the blade as a whole can be thinner than the chainsaw. it can. Therefore, the object to be cut is not wastefully cut, the loss of driving force is eliminated, and the cutting speed can be improved.

(Problems to be Solved by the Invention) However, in the ring saw described above, since the concave portion is formed in the outer peripheral portion of the frame and the guide wheel is arranged inside the concave portion, the frame portion of the ring saw has a large wall thickness. It was a thing. In particular, since the guide wheel is guided by one guide wheel so as not to move in the thickness direction of the frame, the wall thickness of the guide wheel itself also becomes large, which causes an increase in the wall thickness of the frame that holds the guide wheel. Was there.

Therefore, in the ring saw as shown in FIG. 4, although the cutting blade can be thinner than the conventional chain saw, it is necessary to widen the width of the cutting blade according to the frame portion supporting the ring. The cut object had to be cut wastefully, and improvement of the cutting speed and reduction of the driving force were not sufficient.

The present invention has been proposed in order to eliminate the drawbacks of the ring saw as described above. By reducing the wall thickness of the frame and the guide wheel provided on the frame and narrowing the width of the cutting blade, excellent work can be achieved. An object is to provide a ring saw having efficiency.

[Structure of the Invention] (Means for Solving Problems) A ring saw according to the present invention is configured such that a plurality of recesses are alternately formed on both side surfaces of an outer peripheral portion of a frame at predetermined intervals, and the recesses are formed in the recesses. A guide wheel is supported in a holding manner, and the ring is rotatably held from both sides by these guide wheels.

(Operation) According to the ring saw of the present invention having the above-described configuration, the guide wheel is held in the recess on the side surface of the frame in a cantilever manner, so that the guide wheel does not significantly protrude from the side surface of the frame. Further, since the guide wheel itself only prevents the ring from moving to one side, it may be thinner than the type that prevents the ring from moving to both sides.

Therefore, it is possible to reduce the wall thickness of the frame and the guide wheel as a whole, and the width of the cutting blade can be narrowed accordingly, so that the cutting efficiency can be improved.

(Embodiment) An embodiment of the present invention will be specifically described below with reference to FIGS. 1 and 2. The same members as those of the ring saw shown in FIGS. 3 and 4 are designated by the same reference numerals, and the description thereof will be omitted.

* Structure of Embodiment * In this embodiment, as shown in FIG. 1 and FIG.
On the outer peripheral portion of the frame 11 arranged in the central portion of the ring saw, four concave portions 12a are formed on the side surface opposite to the gear 10 as an example.
Are formed. These recesses 12a are formed by bending a part of the outer peripheral portion of the frame 11, and
Two pieces are provided on both sides of the meshing portion with 10, and two pieces are provided below the ring 13 at a predetermined interval.

In these recesses 12a, a shaft 15 is provided in a cantilever manner with respect to the side surface of the frame 11, and the shaft 15 has a guide wheel 15a.
Is rotatably supported. This guide wheel 15a
As shown in FIG. 2A, the ring 13 holds the ring 13 from the side opposite to the gear 10. The outer peripheral surface of the ring 13 corresponds to the inner peripheral surface of the ring 13 of this embodiment. Has become.

On the other hand, as shown in FIG. 1, the gears on the outer peripheral portion of the frame 11
A recess 12b is also formed on the side surface on the 10 side so as to be located between the two recesses 12a below the ring 13. This recess 1
A shaft 15 is also provided in a cantilever manner in 2b, and a guide wheel 15b is rotatably supported by the shaft 15. The guide wheel 15b is provided on the inner circumference of the ring 13 with the guide wheel 1
It comes in contact with the side opposite to 5a. That is, in the present embodiment, the edge of the inner peripheral portion of the ring 13 on the gear 10 side has an edge shape, so that the guide wheel 15b that abuts on the edge is formed.
Is a stepped wheel.

* Operation of the embodiment * In the ring saw of the present embodiment having such a configuration,
The surface of the ring 13 on the gear 10 side is held by the bevel gear 9 and the guide wheel 15b provided in the recess 12b in the lower part of the ring. On the other hand, the surface of the ring 13 opposite to the gear 10 is held by the four guide wheels 15a on the opposite sides of the frame, which are arranged on both sides of the bevel gear 9 and the guide wheel 15b.

As a result, when the bevel gear is rotated by the motor,
The ring 13 driven by this bevel gear rotates around the frame while being pinched from both sides by the bevel gear on one side of the frame and the guide wheel 15b and the bevel gear on the opposite side. It is possible to cut.

As described above, in this embodiment, the guide wheels 15a and 15b that rotatably hold the ring 13 are the frame 11 respectively.
Since the guide wheels are cantilevered in the recesses 12a and 12b formed on the side surfaces, the guide wheels do not project from the frame surface. In particular, in this embodiment, since the recess is formed by bending the plate-shaped frame itself, the thickness of the frame can be made thinner.

Further, since each guide wheel only presses the ring from one side, the wall thickness of the guide wheel can be reduced to half as compared with one guide wheel that prevents the ring from swinging left and right.

* Other Embodiments * The present invention is not limited to the above-described embodiments, and the number and locations of the recesses provided on the outer periphery of the frame can be changed as appropriate. Further, in the above-described embodiment, the ring is pressed from one side by the bevel gear, but if the guide wheel is provided at the bevel gear, it is not necessary to give the ring holding function to the bevel gear. Further, the illustrated embodiment is a ring saw in which a cutting blade is integrally formed with the ring, but the present invention is also applied to a ring saw in which the blade portion can be detachably attached to the ring and only the blade can be replaced. It is possible to do so.

[Effects of the Invention] As described above, according to the present invention, the entire frame is made thin by a simple structure in which the cantilever type guide wheel is provided in the concave portion formed on the side surface of the frame and the ring is supported thereby. Since the thickness of the cutting blade can be reduced, it is possible to provide a ring saw capable of improving the cutting speed and reducing the driving force.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a ring saw of the present invention, FIG. 2 (A) is a sectional view of a guide wheel 15a portion in the FIG. 1 ring saw, and FIG. 2 (B) is also a guide wheel 15b portion. 3 is a cross-sectional view showing the structure of a cutting blade integrated ring saw proposed by the applicant, and FIG. 4 is a side view of FIG. 1 ... Ring saw, 2 ... Frame, 3 ... Ring, 4
...... Concave, 5 ...... Guide wheel, 6 ...... V-shaped groove, 7 ...
... motor bracket, 8 ... motor, 9 ... bevel gear, 10 ... gear, 11 ... frame, 12a, 12b ... recess, 1
3 …… Ring, 14 …… Slope, 15 …… Shaft, 15a, 15b …… Guide wheel.

Claims (1)

[Claims] 1. A ring having a cutting blade on its periphery and a gear on one side surface. b. A frame located in the central opening of the ring. c. Motor supported by frame. d. A bevel gear that is driven by a motor and meshes with the ring gear. e. Recesses formed alternately on both side surfaces of the outer peripheral portion of the frame with a predetermined interval. f. A guide wheel that is supported in a cantilever manner in each of the recesses and rotatably holds the ring from both sides. A ring saw having the above-mentioned requirements.