JP4660079B2 - Saw with an array of saw blades - Google Patents

Description

  The present invention relates to an arrangement of saw blades.

The cutting efficiency and life of a saw are affected by the material and shape of the saw blade, the shape of the saw blade, and the arrangement of the saw blade. In particular, hand saws are desired that can be cut efficiently even with limited human power, and that have excellent sharpness and feel.
Hand-grinding saws are (1) vertical saws composed of vertical grinds, (2) horizontal saws composed of horizontal grinds, and (3) both directions are improved with horizontal grinds. There are thorn saws, (4) vertical and horizontal saws, and other (5) special saws have been tried in part. In addition, there are mechanical saws such as circular saws and chainsaws.

A normal saw is configured by alternately arranging saw blades on the front and back sides. In some places of the saw tooth arrangement, saw teeth having different properties, scraping teeth for discharging chips, or voids for scraping may be inserted.
In any saw blade, wood is cut at the cutting edge of the saw blade.
There are the following three principles for sawing. That is,
I. The thinner the saw blade, the better it cuts (good bite)
B. The harder the saw blade, the longer it will cut (long life),
C. The larger the saw blade, the more crispy it can cut (the larger the sawdust),
It is.

  If the saw blade is too thin, it will become weak and will bend easily, making it easier to bend and making it unusable. In addition, when the saw blade width and the saw blade thickness are basically the same, the friction between the saw blade and the cut becomes stronger as the sawing progresses, and the force required to grind the saw increases. I will do it. For this purpose, the saw blade is bent and expanded in the thickness direction of the saw blade (with clams) to substantially increase the apparent thickness of the saw.

  The present inventor has a pair of claws in which a pair of clams and a pair without clams are alternately consecutively arranged, and the triangular blade surfaces of the tops of the adjacent saw teeth are diagonally opposed and arranged in parallel (arrangement thereof) ( Saw tooth (refer to Patent Document 2), a pair of large clams and a pair of small clams alternately connected to the tooth tract one by one (see Patent Document 2), a pair with an inner set and an outer set So far, an array of saw blades (see Patent Document 3) in which pairs are arranged in pairs adjacent to each other in pairs has been proposed.

In addition, regarding a double-edged saw that is used for both vertical and horizontal grinding, a saw consisting of an inner blade, a middle blade, and an outer blade that is used for both horizontal grinding and vertical grinding. A saw (tooth arrangement) characterized in that the pitch is wider and deeper than the pitch (see Patent Document 4) and an outer blade pair provided with an outward set-up is provided over the entire length of the saw blade. Insert a pair of medium blades for each predetermined number of turns, and then insert a pair of inner blades for each predetermined number of outer blade pairs. Set the tip height of each blade to be lower for the outer blade pair, and the middle blade pair and inner blade pair to be higher than the outer blade pair. saw made by the inclination angle slightly laterally inside against (the sequence of teeth) (Patent Document 5 see) have also been proposed.

In addition, patent document 4 and patent document 5 have the same inventor, and when comparing each FIG. 1, even in patent document 5, in patent document 4, "the pitch of an inner blade and a middle blade is the pitch of an outer blade. It is thought that “the wider and deeper structure” is followed.
Utility Model Registration No. 2587979 Japanese Patent No. 2934140 JP 2002-347006 A Japanese Patent No. 2691704 Japanese Patent No. 3177174

According to the proposals in Patent Documents 1 to 3, by arranging two types of saw blades in a minimum repeating unit, an array of saw blades having sharpness and relatively easy manufacture was realized.
However, although the sharpness is good, the user who actually used it has a voice that it is easy to get tired because of the resistance as a hand saw, and that the cutting of the saw tends to become unstable at the beginning of cutting. Further improvements are desired.

  In view of the above demands, an object of the present invention is to provide a saw in which the cutting of the first cut is smoothed and the sawing resistance is reduced without significantly reducing the sharpness.

The saw having the saw blade arrangement of the present invention is 50% of the outer blade with the outward set, 25% of the inner blade with the inward set, and 25% of the neutral blade without the set. The three types of saw blades are regularly arranged with 4 pairs or 8 pairs of saw blades as basic repeating units.
The inner blade pair and the neutral blade pair are alternately arranged between the outer blade pair and the next outer blade pair, and the outer blade pair and the next outer blade pair. In between, a pair of saw blades composed of the inner blade and the neutral blade and a pair of saw teeth composed of the neutral blade and the inner blade can be alternately arranged.

The arrangement of the saw blades of the present invention is the same as that of Patent Document 2 in the arrangement of the outer blades, but the inner blade or neutral blade arranged between the pair has a larger repeating unit. Satisfying the principles (i) and (c), and by mixing three types of saw blades, the cutting cross-sectional area of the wood shared by each saw blade is reduced. It is thought that there is. As a result of the subject's sensitivity test, it is felt that the voices submitted to Patent Documents 1 to 3 mentioned above are improved.

The present invention is based on a saw manufactured by cutting a saw blade into a saw blade having a substantially uniform thickness and attaching a desired set.
Hereinafter, the present invention will be described in detail with reference to the drawings, taking a hand saw as a horizontal saw.
FIG. 1 is a schematic diagram for explaining a horizontal grind.
FIG. 2 is an explanatory view showing the arrangement of saw blades by the top slope showing the first embodiment of the present invention. FIG. 3 is a schematic view of the cross-section of the sawtooth of the A-line, B-line, C-line, and D-line portion of FIG. 2 viewed from the direction along the saw blade.

FIG. 4 is an explanatory view showing the arrangement of saw blades by the slope of the top showing the second embodiment of the present invention. FIG. 5 is a schematic view of the sawtooth cross section of the portion E, F, G, and H in FIG. 4 as viewed from the direction along the saw blade.
FIG. 6 is an explanatory view showing the arrangement of saw blades by the top slope showing the third embodiment of the present invention. FIG. 7 is an explanatory view showing the arrangement of saw blades by the top slope showing the fourth embodiment of the present invention. 3 and FIG. 3 corresponding to FIG. 6 and FIG. 7 are omitted.

As shown in FIG. 1, the horizontal grind forms a saw blade having a saw blade slope a with an oblique angle with respect to the thickness of the saw blade. In the horizontal grind, the rake angle θ of the sawtooth, the angle of the sloped surface a of the sawtooth, and the angle of the sloped surface c of the sawtooth are combined to determine the hook on the workpiece. Even if the rake angle of the saw blade and the angle of the slope of the saw blade are the same, if the angle of the heaven slope is made sharp, the hook becomes stronger. Note that b is the apex of the celestial slope.
In FIG. 2, 1 is an outer blade virtual line that connects the apexes of the top slope of the outer blade with outward claws, and 2 is an inner portion that connects the apexes of the top slope of the inner blade with inward claws. The blade imaginary line 3 is a neutral blade imaginary line that connects the vertices of the top of the neutral blade with no claws.
4, 4 'indicates the top slope of the outer blade, and the black dot shown at one vertex of the triangle indicates the top of the top slope. 5, 5 ′ indicate the top slope of the inner blade, 6, 6 ′ indicate the top slope of the neutral blade, and the black dot shown at one vertex of each triangle indicates the top of the top slope.

In the first embodiment of the present invention shown in FIG. 2, a pair of inner blades 5 and 5 ′ and a pair of neutral blades 6 and 6 ′ are alternately arranged between a pair of outer blades 4 and 4 ′. Has been inserted. Accordingly, four pairs of saw blades symbolically indicated by triangles are repeated as one repeating unit, and only the apex of the top slope of each blade is shown on both sides thereof.
FIG. 3 is a schematic view of the sawtooth cross section of the line A, line B, line C, and line D in FIG. 2 as viewed from the direction along the saw blade, and the hatching indicating the cross section is omitted. FIGS. 3A and 3C show a pair of outer blades 7, FIG. 3B shows a pair of inner blades, and FIG. 3D shows a pair of neutral blades. Yes.
The first embodiment of the present invention is characterized by high symmetry with respect to the center line of the saw blade.

In the second embodiment of the present invention shown in FIG. 4, the inner blade 5 and the neutral blade 6 ′ form a pair between the pair of outer blades 4 and 4 ′, and the inner blade 5 ′ and the neutral blade 6. Are inserted alternately in separate pairs. Accordingly, four pairs of saw blades symbolically indicated by triangles are repeated as one repeating unit, and only the apex of the top slope of each blade is shown on both sides thereof.
FIG. 5 is a view similar to FIG. 3, and is a schematic view of the cross-section of the sawtooth portion of the E-line, F-line, G-line, and H-line portion of FIG. 5-e and 5-t show a pair of outer blades 7, FIG. 5-f shows a pair of neutral blades and inner blades, and FIG. 5-h shows an inner blade and neutral blades. Each pair is shown.
This second embodiment of the present invention comprises a pair of neutral blade and inner blade shown in FIG. 5B and a pair of inner blade and neutral blade shown in FIG. Although there is no doubt that the body sways from side to side, it can be said that the sharpness and feel while cutting are almost the same as those of the first embodiment.

  The third embodiment of the present invention shown in FIG. 6 is a modification of the first embodiment of the present invention, and the arrangement of the four pairs of saw blades at the beginning of the repeating unit is the first embodiment of the present invention. The following four pairs of sawtooth arrangements are the same as the pair of inner blades 5, 5 'in the sawtooth arrangement of the first embodiment of the present invention, and the neutral blades 6, 6 'Pairs have been exchanged. Therefore, in the third embodiment of the present invention, the pair of saw teeth 8 symbolically indicated by a triangle is repeated as one repeating unit. Since the repeating unit of the saw blade is large, the three principles of saw should be practically applied. However, according to the result of the sensory test, the sharpness and the feel while cutting are the same as those in the first embodiment. It can be said that it has hardly changed.

  The fourth embodiment of the present invention shown in FIG. 7 is a modification of the second embodiment of the present invention, and the arrangement of the four pairs of saw blades at the beginning of the repeating unit is the second embodiment of the present invention. The following four pairs of saw blades are arranged in the same manner as in the saw blade arrangement of the second embodiment of the present invention, and the inner blade 5 and the neutral blade 6 ′ pair and the inner blade 5 ′. And the pair of neutral blades 6 are exchanged. Therefore, in the fourth embodiment of the present invention, the pair of saw teeth 8 symbolically indicated by a triangle is repeated as one repeating unit. Since the repeating unit of the sawtooth is large, the three principles of sawing should be practically applied. However, in the result of the sensory test, the sharpness and feel during cutting are the same as those in the second embodiment. It can be said that it has hardly changed.

The sawtooth arrangement of the present invention can begin with any sawtooth of the repeat unit at the end of the saw. The total number of saw teeth can be set to an appropriate number according to the length of the saw blade. Therefore, the total number of saw teeth may not always be an integral multiple of the number of saw teeth in the basic repeating unit, and such a case is also included in the present invention.
There are no particular restrictions on the degree of clams in outward claws and inward clams.
Although the description has been given mainly using the horizontal saw as an example, the sawtooth arrangement of the present invention is applicable to a vertical saw, a combination of vertical and horizontal saws, and the like. Furthermore, it is considered that the present invention can also be applied to a mechanical saw such as a circular saw.

  The saw with the sawtooth arrangement according to the invention is particularly advantageously used as a hand saw. Further, in the case of a horizontal saw, it is advantageously used for pruning fruit trees, cutting and cutting raw trees (branches) such as underpruning forests, and cutting dry timber.

It is a schematic diagram for demonstrating a horizontal grind. It is explanatory drawing which shows the arrangement | sequence of a sawtooth by the top slope which shows the 1st Embodiment of this invention. It is the schematic diagram which looked at the cross section of the sawtooth of the A line | wire, B line | wire, C line | wire part of FIG. It is explanatory drawing which shows the arrangement | sequence of a sawtooth by the top slope which shows the 2nd Embodiment of this invention. It is the schematic diagram which looked at the cross section of the sawtooth of the ho line of FIG. It is explanatory drawing which shows the arrangement | sequence of a sawtooth by the top slope which shows the 3rd Embodiment of this invention. It is explanatory drawing which shows the arrangement | sequence of a sawtooth by the top slope which shows the 4th Embodiment of this invention.

Explanation of symbols

a: (sawtooth) slope b: (top of the top slope) c: top slope θ: (sawtooth) rake angle 1: (connects the top slope of the outer blade with outward claws) Outer blade imaginary line 2: Inner blade imaginary line linking the top of the slope of the inner blade with the claws facing inward 3: Neutral blade imaginary lines 4, 4 linking the top of the slope of the neutral blade without claws ': Outer blade top slope 5, 5': Inner blade top slope 6, 6 ': Neutral blade top slope 7: Outer blade 8: Inner blade 9: Neutral blade

Claims (3)

Three types of outer blades (7) with claws facing outwards at 50%, inner blades (8) with claws facing inward are 25%, and neutral blades (9) without claws (25%) A saw having an array of saw blades, wherein the saw blades are regularly arranged with 4 pairs or 8 pairs of saw teeth as a basic repeating unit. The saw having an array of saw blades according to claim 1, wherein the pair of inner blades and the pair of neutral blades are alternately arranged between the pair of outer blades and the next pair of outer blades. Between the pair of outer blades and the next pair of outer blades, a pair of saw teeth composed of the inner blade and the neutral blade and a pair of saw teeth composed of the neutral blade and the inner blade are alternately arranged. A saw having an array of saw blades according to claim 1.

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