JP2604273Y2 - Circular saw assembly for multi-row circular saw machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-row circular saw machine generally called a gang used in woodworking machines.
In particular, the present invention relates to a circular saw assembly for a multi-row circular saw, in which a large number of circular saws are arranged on the same axis and used for the multi-row circular saw, etc., to prevent the generation of resonance when the circular saw idles.

[0002]

2. Description of the Related Art As shown in FIG. 10 or 11, a circular saw 1 used in a normal woodworking operation, comprising a main body 2 and a tooth body portion 3 on an outer peripheral portion thereof, has a particularly high speed during rotation. When rotating with the circular saw 1, an air flow called Karman vortex is generated behind the tooth body portion 3 of the circular saw 1. This Karman vortex usually causes a high-speed rotating circular saw to vibrate, and this vibration causes the high-speed rotating circular saw to generate a large resonance sound, and such a large resonance sound deteriorates the working environment. It is known.

In order to prevent the generation of such resonance sound,
Conventionally, in order to enhance the vibration damping of the circular saw main body, as shown in FIG. 10, a groove 4 is cut from the outer peripheral portion toward the center of the main body 2 of the circular saw 1, and a resin or the like is formed in the inner end 5 thereof. A material different from the circular saw material is packed, and furthermore, a split groove 6 is provided in the main body 2 part, and a material different from the circular saw material such as resin is similarly packed into a part 7 of the split groove 6, thereby producing a resonance sound. It is known that the resonance of the main body 2 which generates the following is prevented. Also, instead of providing the split groove 6 in the main body 2, as shown in FIG. 11, a plurality of windows 8 are punched out of the main body 2, thereby preventing resonance of the main body 2 which generates a resonance sound. Is also known.

[0004] This is the same in the case of a circular saw assembly which is arranged in a large number on the same axis for use in a multi-row circular saw machine or the like. That is, hitherto, the same resonance preventing means as described above has been applied to all the circular saws of a circular saw assembly arranged in large numbers on the same axis for use in a multi-row circular saw machine or the like. In addition, the circular saw assembly used in conventional multi-row circular saw machines and the like is designed to be easy to handle or easy to manage.
Only a predetermined number of circular saws having the same shape (for example, the shape shown in FIG. 10) are juxtaposed and used. For example, a circular saw shown in FIG. 10 and a circular saw shown in FIG. 11 are used in combination. There was no such thing.

[0005]

Until now, as described above, a series of circular saws used in a multi-row circular saw or the like all use circular saws having substantially the same shape.
Each circular saw was provided with the same resonance preventing means. That is,
The general idea was that the resonance generated by a plurality of circular saws arranged on the same axis would be reduced as a whole by reducing the resonance generated by each circular saw.

However, a detailed examination of each work situation has revealed that such a concept is not always correct. For example, when the same resonance preventing means is applied to circular saws of the same shape, the resonance sound during idling has a predetermined value (A
(Decibels), in a multi-row circular saw using N circular saws having the same shape and the same resonance preventing means, the N is smaller than when no resonance preventing means is used.
It has been found that the resonance is hardly reduced by a factor of two, and in many cases the reduction of the resonance is smaller.

As a result of various studies on the reason, the applicant has found that
At the time of idling, even if the resonance sound of the circular saw alone decreases by a predetermined value, in the case of a multi-row circular saw woodworking machine in which a number of circular saws are arranged at intervals on the same axis, the saw and the saw During this time, a standing wave of air vibration is generated, which causes a resonance sound different from that of the circular saw alone. It has been found that it is difficult to prevent resonance sound as a whole circular saw assembly used in a sawing machine or the like.

Accordingly, the present invention provides a new means for preventing resonance when a large number of circular saws are simultaneously rotated by means different from the means for preventing the generation of resonance sound during idling in individual circular saws. Aim.

[0009]

According to the present invention, in order to solve the above-mentioned problems, a plurality of circular saws used in a multi-row circular saw have different sizes, positions, numbers, shapes and the like. By providing round holes and arranging them in combination with each other, resonance noise generated by a plurality of circular saws used in a multi-row circular saw or the like is greatly reduced.

[0010]

According to the present invention, since a plurality of circular saws have various circular holes in the main body, a complicated air flow is applied between the circular saws, and a standing wave of air vibration is generated between the saws. Less likely to occur. In addition, since the size, position, number, shape, etc. of the round holes are different combinations between adjacent circular saws,
A standing wave of air vibration is hardly generated between the saws.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. First, as shown in FIG.
A circular saw 10 having a diameter of 03 mm, a blade thickness of 2.2 mm, a main body thickness of 1.6 mm, a hole diameter of 80 mm, and a number of blades of 100.
2 has a mounting hole 14 in the center thereof and a body portion 12.
Has a tooth portion 16 for cutting on the outer peripheral portion thereof, and the body portion 12 has an angle of 90 ° from the tooth portion 16 toward the center.
The four grooves 18 are cut at intervals of
For 0, 17 circular saws 10 packed with a material different from the circular saw material such as resin or aluminum were prepared. These circular saws 10 were arranged uniaxially at a distance of 50 mm from each other with spacers therebetween to form a circular saw assembly 22, and the circular saw assembly 22 was rotated at a speed of 4000 rpm.
The resonance at this time was about 2850 Hz, and the noise amount was 9
At 4.5 decibels, very loud harsh noise was perceived.

Next, another circular saw 24 having the same size and shape as the circular saw 10 as shown in FIG. 1 is prepared, and among the four grooves 18 provided in the main body, grooves adjacent to each other. 18
A circular saw 24 as shown in FIG. 2 was formed having a pair of punched holes 26 having a diameter of 25 mm formed at positions opposed to each other in the diameter direction. These 17 circular saws 24 are connected to each other through spacers for 5
Arranged on a single axis, separated by 0 mm to form a circular saw assembly
Then, rotate the circular saw assembly at a speed of 4000 rpm.
Was. The resonance at this time was about 28
At 50 Hz and the noise level is 94.5 dB, extremely
A loud harsh noise was detected.

Further, another circular saw 28 having the same size and shape as the circular saw 10 as shown in FIG. 1 is prepared, and a diameter is defined between four adjacent grooves 18 provided in the main body. Two pairs of punched holes 3 having a diameter of 25 mm
A circular saw 28 was formed as shown in FIG. This
These 17 circular saws 28 are placed 50 mm apart from each other via spacers.
And place them on a single axis to form a circular saw assembly.
The circular saw assembly was rotated at a speed of 4000 rpm. This and
The resonance sound is about 2850 Hz although the peak is dispersed,
The noise level is 94.5 dB, which is extremely loud and harsh.
A sound was detected.

Next, as shown in FIG. 4, the circular saws 10, 24, 28 are arranged in order of circular saws 24, 28, 10 from the left in the same manner as described above. Arrayed on the top and 4 in a multi-row circular saw similar to the above.
At a speed of 000 rpm.

At this time, the amount of noise was 81.8 dB, and a reduction in the amount of noise of 12.7 dB was measured as a whole, and it was also observed that unpleasant resonance sound was eliminated.

5 to 9 show another embodiment. In this embodiment, first, the diameter is 305 mm and the blade thickness is 2.2 m.
m, a circular saw 40 having a body thickness of 1.6 mm, a hole diameter of 80 mm, and a number of blades of 100. A mounting hole 44 is provided at the center of the body portion 42 and an outer peripheral portion of the body portion 42 is cut. And the main body portion 42 has a tooth body portion 46.
Four grooves 48 are cut at 90 ° intervals from the center toward the center direction, and twelve circular saws 40 filled with a material different from the circular saw material such as resin are prepared at the inner ends 50 thereof. did. These circular saws 40 are separated from each other by 80 m
The circular saw assembly 52 was arranged at a distance of m on one axis, and the circular saw assembly 52 was rotated at a speed of 4100 rpm. At this time, the resonance sound was about 3600 Hz, and the noise amount was 101.6 dB, and extremely loud and unpleasant noise was detected.

Next, another circular saw 54 having the same size and shape as the circular saw 40 as shown in FIG. 5 is prepared, and is provided between four adjacent grooves 48 provided in the main body. Two pairs of punched holes 5 having a diameter of 40 mm
A circular saw 54 as shown in FIG. This
Separate these circular saws 54 by 80 mm from each other with spacers
To form a circular saw assembly.
The body was rotated at a speed of 4100 rpm. Resonance at this time
The sound was distributed at about 3600 Hz although the peaks were dispersed.
The volume is 101.6 dB, which is extremely loud and harsh
A sound was detected.

Further, another circular saw 58 having the same size and shape as the circular saw 40 as shown in FIG. 5 is prepared, and diametrically arranged between four adjacent grooves 48 provided in the main body thereof. A circular saw 58 having three pairs of punched holes 60 each having a diameter of 40 mm formed at a position facing the circular saw 58 as shown in FIG. these
The circular saws 58 are separated from each other by 80 mm via a spacer.
Arranged on a shaft to form a circular saw assembly, and this circular saw assembly
It rotated at a speed of 4100 rpm. The resonance at this time is
About 3600Hz although the peak was dispersed, and the noise level
Has a very loud and unpleasant noise of 101.6 dB
I sensed.

Further, another circular saw 62 having the same size and shape as the circular saw 40 as shown in FIG. 5 is prepared, and the diameter is defined between four adjacent grooves 48 provided in the main body. 4 pairs of punched holes 6 with a diameter of 30 mm
4 and a circular saw 62 as shown in FIG. 8 in which two pairs of punched holes 66 having a diameter of 40 mm were formed between the holes 64 in the main body defined by the grooves 48. These circular saws 62 are connected to each other with a spacing of 80 mm.
Separated on one axis to form a circular saw assembly,
The saw assembly was rotated at a speed of 4100 rpm. At this time
The resonance sound of about 3600Hz although the peak was dispersed,
The noise level is 101.6 dB, which is extremely large
Rina noise was detected.

Next, as shown in FIG. 9, these circular saws 54, 58, 62 are three circular saws 58, 62, 5 from the left.
12 in the same manner as described above in the order of 4, 62, 80 m each
m were arranged in one row through spacers, and rotated at a speed of 4100 rpm in a multi-row circular saw similar to that described above.

The amount of noise at this time was 95.8 dB, and a reduction of the amount of noise of 5.8 dB was measured as a whole, and it was observed that unpleasant resonance sound was also eliminated.

As a result of the above-mentioned experiment and various other experiments by the applicant, it has been found that the following phenomena become clear according to the circular saw assembly of the present invention.

1) According to the present invention, the main body of a plurality of circular saws
Because there are various round holes in each minute, complicated air flow between each circular saw
This creates a standing wave of air vibration between the saws.
And the size, position, number, shape, etc. of the round holes
Different combinations between adjacent circular saws
Therefore, a standing wave of air vibration is hardly generated between the saws.
No. In particular, rather than arranging different types of circular saws one by one as in Example 1, by arranging circular saws of the same type as two or three sets as shown in Example 2, The noise prevention effect increases. This is the same kind of circular saw
When placed as a set of three or three sheets, next to them
A certain amount of air is held between similar circular saws in contact,
In the limit, air flow which is a noise source is blocked,
Noise reduction effect than when different kinds of circular saws are placed
Seems to be larger.

2) In both cases of the first and second embodiments, when the magnitude of each frequency component is examined by FFT, a large-level frequency component that becomes a resonance is eliminated, and a small-level frequency component is eliminated. Will be seen more.

3) A similar effect was provided regardless of the diameter of the circular saw.

4) The shape of the hole formed in the main body of the circular saw provides the same effect irrespective of the circular hole, the long groove and the like.

5) When the shape of the hole formed in the main portion of the circular saw is the same, a similar effect can be provided by changing the size or the number.

[0028]

According to the present invention, a simple processing of, for example, drilling a hole of a simple shape having a different size or number is applied to a main portion of a circular saw, and a circular saw having a different size or a different number of holes is formed. By arranging the circular saws in combination, it is possible to provide a circular saw for a multi-row circular saw, which can eliminate harsh resonances and greatly reduce noises, which can greatly contribute to improvement of a working environment.

[Brief description of the drawings]

FIG. 1 is a plan view showing one circular saw constituting a circular saw assembly for a multi-row circular saw machine according to a first embodiment of the present invention.

FIG. 2 is a plan view showing another circular saw constituting the circular saw assembly for a multi-row circular saw according to the first embodiment of the present invention;

FIG. 3 is a plan view showing still another circular saw constituting the circular saw assembly for a multi-row circular saw machine according to the first embodiment of the present invention;

FIG. 4 is a view showing a configuration of a circular saw assembly for a multi-row circular saw machine according to a first embodiment of the present invention.

FIG. 5 is a plan view showing a circular saw constituting a circular saw assembly for a multi-row circular saw machine according to a second embodiment of the present invention.

FIG. 6 is a plan view showing one circular saw constituting a circular saw assembly for a multi-row circular saw machine according to a second embodiment of the present invention.

FIG. 7 is a plan view showing another circular saw constituting a circular saw assembly for a multi-row circular saw machine according to a second embodiment of the present invention.

FIG. 8 is a plan view showing another circular saw constituting a circular saw assembly for a multi-row circular saw machine according to a second embodiment of the present invention.

FIG. 9 is a view showing a configuration of a circular saw assembly for a multi-row circular saw machine according to a first embodiment of the present invention.

FIG. 10 is a plan view showing a known circular saw.

FIG. 11 is a plan view showing another known circular saw.

[Explanation of symbols]

10: Circular saw 12: Body part 14: Hole 16: Teeth 18: Groove 20: Inner end 22: Circular saw assembly 24: Circular saw 26: Hole 28: Circular saw 30: Hole 40: Circular saw 42: Body 44: Hole 46: Tooth 48: Groove 50: Inner end 52: Circular saw assembly 54: Circular saw 56: Hole 58: Circular saw 60: Hole 62: Circular saw 64: Hole 66: Hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B27B 1/00-33/20

Claims (3)

(57) [Scope of request for utility model registration] 1. A circular saw assembly for a multi-row circular saw in which a large number of circular saws having the same diameter are arranged on the same axis, holes are provided in a main body portion of each circular saw, and the size of these holes is large. is, the same shape, different circular saw at least one number from each other
A circular saw assembly for a multi-row circular saw machine arranged at a distance . 2. The circular saw assembly for a multi-row circular saw according to claim 1, wherein circular saws having holes different in at least one of size, shape and number are continuously arranged one by one. 3. A group consisting of two or three sheets having holes of the same size, shape and number as each other , and each of these groups
Differ in at least one of size, shape and number
The circular saw assembly for a multi-row circular saw machine according to claim 1, wherein the circular saw assembly is arranged continuously adjacent to the group having holes .