JPS63274501A - Saw - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a saw, and more particularly to an improved invention regarding the relational structure of a saw tooth to a saw blade.

[Prior art]

In order to prevent friction between the saw blade and the material to be cut and to make the sawing process smooth, a saw normally has a mechanism called a sari (tooth swing), which is used to prevent friction between the saw blade and the material to be cut, and to make the sawing process smoother.As shown in FIG. Each sheet is distributed alternately to the left and right. However, the degree of formation of this clam differs depending on the type of material to be cut, such as dry wood, hard wood, wet wood, and other soft wood, but usually it is considered appropriate to be about 1.3 to 1.8 times the thickness of the clam. If there are too many clams, the width of the saw will become wider, making it harder for the saw to cut, and the blade will wear out faster. Also, if the clams are symmetrical, the cut surface is likely to bend.

By the way, it is extremely difficult to form such clams uniformly and uniformly over the entire length.
Therefore, Utility Publication No. 17-7535 and other Special Publication No. 1983-4
In the device disclosed in Japanese Patent No. 6627, as shown in FIG. 6, the cross section of the saw blade 21 is formed into a shape with the width of the blade edge gradually increasing relative to the back edge. By providing the necessary teeth 22 in the portion, the formation of the set part is made unnecessary.

[Problem that the invention seeks to solve]

However, the saw of the type shown in FIG.
The angle θ2 formed by the outer surface of the tooth 22 (extended surface of the saw blade 21) with respect to the reference line (cutting surface) XX parallel to the line dividing the saw blade 21 into left and right thirds is This is smaller than the angle θ1 formed by the outer surface of the tooth 12 with respect to the same reference line XX in FIG. 5, and this is because the tooth 12 in FIG. On the other hand, the outer surface of the tooth 22 in FIG. 6 is on the extension line of the outer surface of the saw blade 21 which is shaped like a saw blade, and the fact that the angle between the outer surface of the tooth and the cut surface is small in this way means that Compared to the saw in Fig. 5, the saw in Fig. 6 has greater friction and requires more effort. On the other hand, the one shown in FIG. 5 has the disadvantage that the edges tend to be uneven as described above, and the blade is also prone to friction.

In addition, when polishing the outer surface of the tooth, the tooth in Figure 5 has a groin attached, so polishing is troublesome, whereas the tooth in Figure 6
Although the one shown in the figure is easy to polish, all sides of the saw blade 21 must be polished, reducing the overall thickness of the saw blade.

The present invention has been made to address these problems, and the distribution of the sawtooth to the outer surface of the saw blade is made as large as possible inside, and this distribution is formed without variation, and the outer surface of the sawtooth is cut. By increasing the angle to the surface, the teeth are arranged uniformly, reducing the labor required for sawing, maintaining the durability of the cutting edge for a long time, and providing a saw with teeth that are difficult to break. It is.

[Means for solving problems]

The present invention involves extruding the saw teeth of a saw blade by extruding the entire white part one by one alternately left and right outward so that the tip of each tooth protrudes diagonally outward; It is characterized in that the root step portion formed at the root of each tooth draws a wavy curved shape in the longitudinal direction of the saw length.

[For production]

In the saw of the present invention, the width between the tips of the teeth can be made as large as possible with respect to the saw blade by having the white part of each saw blade pushed out to both sides of the saw blade and tilted. In addition, by enlarging the angle between the outer surface of each tooth and the cutting surface, wear on the cutting edge is reduced, and friction against the material to be cut is minimized, making sawing work easier. It can be done easily.

Also, as mentioned above, because the width between the tips of the tooth tips is made as large as possible by die extrusion, there is a large stress on the sides of the saw teeth from both outer sides during sawing in an almost right angle direction, and this applies to each tooth. This is a force that tries to break off the tooth base from the base, but since the tooth root step formed by extrusion is designed to draw a wavy curve shape in the longitudinal direction of the saw length, the stress concentrates on the tooth root step. The root step part has a wavy curved shape and disperses and absorbs it toward the saw blade, thus effectively preventing the tooth from breaking.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is a saw blade, 2 is a saw tooth formed on the longitudinal side edge of the saw blade 1, and each of these saw teeth 2a, 2b is a tooth base ( Ukara tooth tip (
The white part (the entire BJ) extending from (b) is mold-extruded one by one in such a way that it extends diagonally outward to the left and right, and the entire white part (BJ) is molded so that the tip 3 of the tooth tip (b) is on the outside. A required cutting angle (a) and a cutting edge angle (b) are formed on the inner surface of each tooth on the anti-extrusion side.

Furthermore, the above-mentioned die extrusion is performed by each saw tooth 2a, 2.
This is done using an extrusion mold in which the step 4 formed on the dente (b) draws a wavy curve as shown in Fig. 2. In FIG. 2, it is a curved line that enters the saw blade 1 side, but it may be a wavy curved shape that enters the tooth length portion (c) as shown by the solid line 4a or broken line 4b in FIG. 3.

In addition, the overhang width of the tip 3 of each of the teeth 2a, 2b to the left and right is 1.3 to 2.3 times the thickness of the saw blade 1,
Roughly, the inclination angle θ of each tooth with respect to the cutting surface XX is 15 to 2
It is preferable to set the angle within a range of 3°. In addition, in the case of horizontal teeth, a side edge (C1) and an upper edge (dl) are attached to each of the teeth.

The saw with the above configuration does not require setting a set on each tooth or making the saw blade have a particularly elongated cross section as in the conventional case, but the entire tooth height portion (A) of each tooth 2a, 2b is made into one piece. The width of the tip 3.3 of each tooth can be made smaller than the thickness of the saw blade 1 because it is formed by extruding the teeth alternately on the left and right and slanting the tips 3 to position them outward. In addition, each tooth 2
It became possible to polish only the outer surface of a + 2b, making it possible to finish the outer surface of sawtooth 2 uniformly, and also to round the angle θ formed with respect to the reference line (cutting surface) of the tooth XX. It can be made sufficiently large just like .

In particular, in the case of the saw having the above configuration, when extruding the entire tooth height portion < IQ of each tooth 2a, 2b outward one by one alternately on the left and right, the step formed by extrusion on the root of each tooth (4 4 (or 4a, 4b) uses an extrusion die that draws a wavy curve, so when sawing wood with a saw, the stress that acts on the tooth height part (1) and the tooth root (A) can be calculated from each part of the wavy curve. Since the saw blades can be dispersed in one direction perpendicular to the curve, even if the teeth are formed by extruding the die, the saw teeth 2a, 2 at the tooth root step portion 4, that is, the tooth root (a).
b is prevented from breaking. That is, if the saw teeth 2a, 2b are extruded outward by mold extrusion as described above, and the width of the tip 3.3 of each tooth is made as large as possible than the thickness of the saw blade 1, the width As a result, when sawing, the stress acting on the saw teeth 2a and 2b from the outside at a right angle to the side surfaces of the saw teeth from the material to be cut increases. At this time, if the root step 4' is formed linearly in the longitudinal direction of the saw as shown in FIG. 4, stress concentration will occur on the root step 4'. The saw teeth 'la and 2b were broken off.

However, if the dedendum step portion 4 is formed into a wavy curved shape, this stress concentration will not occur, and therefore no breakage will occur.

〔Effect of the invention〕

As described in detail above, according to the present invention, each tooth can be formed uniformly, the width of the tip of each cutting edge can be made significantly larger than the inside of the saw blade, and each tooth can be formed with respect to the cutting surface. By forming the angle of inclination of the outer surface as large as possible, it is possible to make sawing easier and to increase wear resistance, so that the saw can be used stably for a long period of time.

In particular, the present invention has been able to provide a durable saw with less breakage of the saw tooth by avoiding concentration of the stress that the saw tooth receives during sawing at the tooth root due to the tooth root step portion which draws a wavy curved shape.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a saw showing one embodiment of the present invention, and FIG.
The figure is a side view of the main part of the saw, FIG. 3 is a diagram showing a modification of the root step shape, and FIG. 4 is a diagram for explaining the disadvantages when the tooth root step shape is a straight line. FIG. 5 is a vertical sectional front view showing the chimney shape of a general saw, and FIG. 6 is a vertical sectional front view of a conventional saw that is an improved version of FIG. 1...Saw blade, 2.2a, 2b-Sawtooth, 4.4a, 4b
...Tooth base step, (I...Tooth base, (B)...Tooth tip,
(River... Tooth length part. 'Nin-tun. IC: + knee five- Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] (1) The serrations in the saw blade are formed by extruding the entire tooth height part one by one alternately left and right outward so that the tip of each tooth protrudes diagonally outward, and
A saw in which the tooth root stepped portion formed at the root of each tooth by this die extrusion draws a wavy curved shape in the longitudinal direction of the saw.