Saw

Abstract

To provide a saw with no sense of discomfort due to intermittent catching.SOLUTION: A blade having an outer set protruding to a rear face is represented by "Rear 1". A blade having the outer set protruding to a front face is represented by "Front 1". A neutral blade for which a tip part of the blade agrees with the rear face, and a front face side of the blade is tilted is represented by "Rear 2". The neutral blade for which the tip part of the blade agrees with the front face, and the front face side of the blade is tilted is represented by "Front 2". The blade having an inner set, for which the tip part of the blade is closer to the rear face than a middle in a thickness direction of a saw body is represented by "Rear 3". The blade having the inner set, for which the tip part of the blade is closer to the front face than the middle in the thickness direction of the saw body is represented by "Front 3". On a rear side, "Rear 1", "Rear 2", and "Rear 3" toward a tip side from an original side of the saw body are expressed as basically repeating units in arrangement of three kinds of blades. On a front side, "Front 1", "Front 3", and "Front 2" toward the tip side from the original side of the saw body, that are displaced to the original side for the basically repeating units on the rear side by an amount equivalent to one blade are expressed as the basically repeating units in the arrangement of the three kinds of blades.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an arrangement of saw blades. [Background technology]

[0002] A typical saw is constructed with saw blades arranged alternately on the front and back sides. Sometimes saw blades with different properties, scraping blades for discharging chips, or scraping spaces are inserted in between the saw blade arrangement.

[0003] Figures 2 and 3 of Patent Document 1 disclose a saw in which a pair of outer blades 7 with outward clasps, a pair of inner blades 8 with inward clasps, a pair of outer blades 7 with outward clasps, and a pair of neutral blades 9 with no clasps are regularly arranged.

[0004] The pair of outer blades refers to a blade with an outer set that protrudes from the back surface of the saw blade, and a blade with an outer set that protrudes from the front surface of the saw blade. The blade with an outer set has the function of reducing friction between the front and back surfaces of the saw blade by making the width of the cut made in the wood larger than the thickness of the saw blade.

[0005] The pair of inner blades refers to a blade with an inner set where both the back and front surfaces of the blade are inclined toward the top of the blade and the top of the blade is closer to the back surface than the middle in the thickness direction of the saw blade, and a blade with an inner set where both the back and front surfaces of the blade are inclined toward the top of the blade and the top of the blade is closer to the top surface than the middle in the thickness direction of the saw blade. The inner blades have the function of cutting off the part of the kerf formed in the wood that is closer to the center, corresponding to the thickness of the saw blade.

[0006] A neutral blade is a blade in which the back surface and the top of the blade coincide with the back surface of the saw blade and the front surface of the blade is inclined toward the top of the blade, and a blade in which the front surface and the top of the blade coincide with the front surface of the saw blade and the back surface of the blade is inclined toward the top of the blade. A neutral blade has the function of cutting the front and back portions of the kerfs formed in wood that correspond to the thickness of the saw blade. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 4660079 Summary of the Invention [Problem to be solved by the invention]

[0008] There is a demand for hand saws that can cut efficiently even with limited human strength, and that also have excellent sharpness and feel. The saw blade arrangement shown in Figures 2 and 3 of Patent Document 1 causes an uncomfortable feeling of the saw intermittently catching when cutting the workpiece (wood).

[0009] Therefore, we investigated the discomfort of the intermittent catching in detail. First, we used Figure 13 to consider the amount of work (cutting volume) when sawing with a saw with a pair of outer blades with outward set teeth, a saw with a pair of neutral blades without set teeth, and a saw with a pair of inner blades with inward set teeth.

[0010] Figure 13(A) shows the cross-sectional shape of the saw blade, the cross-section deepening caused by repeated sawing, and the amount of work done in one sawing pass for a saw with only outer set blades alternating on the front and back, Figure 13(B) shows the cross-sectional shape of the saw blade, the cross-section deepening caused by repeated sawing, and the amount of work done in one sawing pass for a saw with only outer set blades alternating on the front and back, Figure 13(C ...

[0011] The saw shown in Figure 13(C) does not actually exist. However, when sawing with a saw with an outer set blade, an unset blade, and an inner set blade, the saw cannot move in the front-to-back direction. Therefore, as shown in Figure 13(D), the inner set blade is limited to cutting the remaining portion between the cut allowance of the outer set blade and the cut allowance of the unset blade. The inner set blade cuts the narrow portion including the apex of the two triangles. Therefore, when sawing with the same force as the outer set blade, it cuts deeply into the narrow portion in the thickness direction of the cutting width. Furthermore, there is a large difference in the cut depth between the outer set blade and the inner set blade. Therefore, the areas where the intermittent catching or discomfort occurs are when the inner set blade digs deep into the wood when the cutting area moves from the outer set blade to the inner set blade.

[0012] Therefore, the inventors of the present invention have conducted various studies on the arrangement of blades to resolve this discomfort. First, the significance of having two pairs of outer blades, as in the arrangement of saw blades shown in Figures 2 and 3 of Patent Document 1, is that it prevents sawing from becoming unsmooth (so-called "stiffness"). This is self-evident to those skilled in the art. Therefore, while it may seem easy at first glance to eliminate one pair of outer blades 7 from the saw having two pairs of outer blades (front and back) as described in Patent Document 1, more specifically, from the repeated arrangement of a pair of outer blades 7 (front and back), a pair of inner blades 8 (front and back), a pair of outer blades 7, and a pair of neutral blades 9 (front and back), it is contrary to common sense and is not normally conceivable.

[0013] However, the inventor went against this common sense and, through trial and error, investigated an arrangement in which one pair of outer blades was removed from the two pairs. He found the following unexpected effects: 1. The discomfort of intermittent catching was eliminated; 2. The expected stiffness did not occur; and 3. The saw exhibited a further improvement in sharpness compared to the saw shown in Figures 2 and 3 of Patent Document 1. Based on these results, the inventor came up with the present invention. [Means for solving the problem]

[0014] In order to solve the above problems, the saw according to the first aspect of the present invention comprises: A blade with an outer set protruding from the surface of the saw blade is called "1-Omote"; A blade with an outer set protruding from the back of the saw blade is called "1ura"; A neutral blade in which the top and surface of the blade are aligned with the surface of the saw blade and the back side of the blade is inclined toward the top of the blade is called a "2-table" blade. A neutral blade in which the top and back of the blade are aligned with the back of the saw blade and the surface of the blade is inclined toward the top of the blade is called "2ura"; A blade with an inner set where both the back and front of the blade are inclined toward the top of the blade and the top of the blade is closer to the surface than the middle of the thickness direction of the saw blade is called "3-table", and A blade with an inner set where both the back and front of the blade are inclined toward the top of the blade and the top of the blade is closer to the back than the middle of the thickness of the saw blade is designated as "3 back". A saw in which the front blades and back blades are arranged alternately, On the back side, the basic repeating unit of the arrangement of the three types of blades is, from the base to the tip of the saw blade, "1 back", "2 back", "3 back", or "2 back", "3 back", "1 back", or "3 back", "1 back", "2 back", or a combination of "1 back", "2 back", "3 back" and "1 back", "3 back", "2 back", On the front side, the basic repeating unit for the arrangement of three types of blades is shifted by one blade toward the base or tip compared to the basic repeating unit on the back side, and from the base to the tip of the saw blade, it is either "1 face", "2 face", or "3 face", or "2 face", "3 face", "1 face", or "3 face", "1 face", "2 face", or a combination of "1 face", "2 face", or "3 face" with "1 face", "3 face", or "2 face".

[0015] A saw according to a second aspect of the present invention has the same configuration as the first aspect of the present invention, but also has: The basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is either "1 back", "1 front", "2 back", "3 front", "3 back", "2 front" from the base side of the saw blade to the tip side, or "1 front", "1 back", "2 front", "3 back", "3 front", "2 back".

[0016] A saw according to a third aspect of the present invention has the same configuration as the first aspect of the present invention, as well as: The basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is either "1 front", "1 back", "3 front", "2 back", "2 front", "3 back" from the base side of the saw blade to the tip side, or "1 back", "1 front", "3 back", "2 front", "2 back", "3 front".

[0017] A saw according to a fourth aspect of the present invention has the same configuration as the first aspect of the present invention, as well as: The basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is either "1 front", "1 back", "2 front", "2 back", "3 front", "3 back" from the base side of the saw blade to the tip side, or "1 back", "1 front", "2 back", "2 front", "3 back", "3 front".

[0018] A saw according to a fifth aspect of the present invention has the same configuration as the first aspect of the present invention, as well as: The basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is either "1 back", "1 front", "3 back", "3 front", "2 back", "2 front" from the base side of the saw blade to the tip side, or "1 front", "1 back", "3 front", "3 back", "2 front", "2 back".

[0019] A saw according to a sixth aspect of the present invention has the same configuration as the first aspect of the present invention, as well as: The basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is either "1 front", "1 back", "2 front", "2 back", "3 front", "3 back", "1 front", "1 back", "3 front", "3 back", "2 front", "2 back", or "1 front", "1 back", "3 front", "2 back", "2 front", "3 back", "1 front", "1 back", "2 front", "3 back", "3 front", "2 back". [Effects of the Invention]

[0020] According to the present invention, it is possible to provide a saw with a blade arrangement that provides the following unexpected effects: 1. No discomfort caused by intermittent catching, 2. No anticipated dullness occurs, and 3. Further improvement in sharpness is observed compared to the saw shown in Figures 2 and 3 of Patent Document 1. After conducting cutting tests and examining the above "no discomfort caused by intermittent catching," it was determined that this is due to the fact that the conventional invention has two- and four-fold blade arrangements, while the present invention has three types of blade arrangements.

[0021] The saw with two pairs of outer tabs, one on the front and one on the back, shown in Figures 2 and 3 of Patent Document 1 has been designed to improve sharpness as an effect of the invention. However, the present invention further improves sharpness as described in 3 above, leading to fewer cuts with the same sawing force as before. However, that is not the aim. According to an apple farmer in Aomori Prefecture, selecting and cutting apple branches all day long is very tiring sawing work. Therefore, by further improving sharpness, it will be possible to select and cut apple branches with less sawing force and the same number of cuts as before, leading to lighter labor in the all-day work of cutting apple branches. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a side view of a saw according to an example of the present invention. [Figure 2]The three types of blades used in the saw according to the present invention are shown in Fig. 2(A) which shows a pair of front and back blades with an outer set, Fig. 2(B) which shows a pair of front and back neutral blades without a set, and Fig. 2(C) which shows a cross-sectional view of a pair of front and back blades with an inner set. [Figure 3] This is an arrangement table for a saw according to a first embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for the three types of blades shown in Figure 3(A). Figure 3(B) is a side view of a saw in which three types of blades are formed in a row on the front and back according to the blade front and back arrangement table shown in Figure 3(A). Figure 3(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 3(B). [Figure 4] This is an arrangement table for a saw according to a second embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for the three types of blades shown in Figure 4(A). Figure 4(B) is a side view of a saw in which three types of blades are formed according to the front and back arrangement table for the blades shown in Figure 4(A). Figure 4(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 4(B). [Figure 5] This is an arrangement table for a saw according to a third embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for the three types of blades shown in Figure 5(A). Figure 5(B) is a side view of a saw in which three types of blades are formed in a row on the front and back according to the blade front and back arrangement table shown in Figure 5(A). Figure 5(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 5(B). [Figure 6] This is an arrangement table for a saw according to a fourth embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for the three types of blades shown in Figure 6(A). Figure 6(B) is a side view of a saw in which three types of blades are formed according to the front and back arrangement table for the blades shown in Figure 6(A). Figure 6(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 6(B). [Figure 7] This is an arrangement table for a saw according to a fifth embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for three types of blades shown in Figure 7(A). Figure 7(B) is a side view of a saw in which three types of blades are formed in a row on the front and back according to the blade front and back arrangement table shown in Figure 7(A). Figure 7(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 7(B). [Figure 8]This is an arrangement table for a saw according to a sixth embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for the three types of blades shown in Figure 8(A). Figure 8(B) is a side view of a saw in which three types of blades are formed according to the front and back arrangement table for the blades shown in Figure 8(A). Figure 8(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 8(B). [Figure 9] This is an arrangement table for a saw according to a seventh embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for three types of blades shown in Figure 9(A). Figure 9(B) is a side view of a saw in which three types of blades are formed in a row on the front and back according to the blade front and back arrangement table shown in Figure 9(A). Figure 9(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 9(B). [Figure 10] This is an arrangement table for a saw according to an eighth embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for the three types of blades shown in Figure 10(A). Figure 10(B) is a side view of a saw in which three types of blades are formed according to the front and back arrangement table for the blades shown in Figure 10(A). Figure 10(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 10(B). [Figure 11] This is an arrangement table for a saw according to a ninth embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for the three types of blades shown in Figure 11(A). Figure 11(B) is a side view of a saw in which three types of blades are formed according to the front and back arrangement table for the blades shown in Figure 11(A). Figure 11(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 11(B). [Figure 12] This is an arrangement table for a saw according to a tenth embodiment of the present invention, in which three types of blades are arranged as shown in the front and back arrangement table for the three types of blades shown in Figure 12(A). Figure 12(B) is a side view of a saw in which three types of blades are formed according to the front and back arrangement table for the blades shown in Figure 12(A). Figure 12(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 12(B). [Figure 13]This relates to saws common to the prior art and the present invention, and shows the cross-sectional shape of the saw blade, the cross-sectional digging state due to repeated sawing, and the amount of work done in one sawing pass for a saw common to the prior art and the present invention, with Figure 13(A) being a saw having only outer set blades alternating on the front and back, Figure 13(B) being a saw having only unset blades alternating on the front and back, and Figure 13(C) being a saw having only inner set blades alternating on the front and back. DETAILED DESCRIPTION OF THE INVENTION

[0023] A saw according to an embodiment of the present invention will be described below with reference to the drawings.

[0024] [First embodiment] Figure 1 is a side view of a saw according to an example of the present invention. The positional relationship of terms used to define the saw of the present invention, such as "butt," "tip," "front," and "sawing direction," is shown in Figure 1. When a right-handed operator holds the saw and cuts wood, the side that the operator sees is the "front," and the opposite side is the "back."

[0025] The saw of the present invention has three types: a pair of front and back blades "1 back" and "1 front" with external setts as shown in Figure 2(A), a pair of front and back neutral blades "2 back" and "2 front" without setts as shown in Figure 2(B), and a pair of front and back blades "3 back" and "3 front" with internal setts as shown in Figure 2(C).

[0026] where: A blade with an outer set protruding from the back of the saw blade is called "1ura"; A blade with an outer set protruding from the surface of the saw blade is called "1-Omote"; A neutral blade in which the top and back of the blade are aligned with the back of the saw blade and the surface of the blade is inclined toward the top of the blade is called "2ura"; A neutral blade in which the top and surface of the blade are aligned with the surface of the saw blade and the back side of the blade is inclined toward the top of the blade is called a "2-table" blade. A blade with an inner set where both the back and front surfaces of the blade are inclined toward the top of the blade and the top of the blade is closer to the back surface than the middle of the thickness direction of the saw blade is called a "3-back" blade, and A blade with an inner set where both the back and front of the blade are inclined toward the top of the blade and the top of the blade is closer to the surface than the middle of the thickness direction of the saw blade is called a "3-table" blade. It shall be displayed.

[0027] The saw according to the present invention is a saw in which front blades and back blades are arranged alternately, On the back side, the basic repeating unit of the arrangement of the three types of blades is "1 back", "2 back", "3 back" from the base side to the tip side of the saw blade, or "1 back", "3 back", "2 back", or further, the arrangement is "1 back", "2 back", "3 back", "1 back", "3 back", "2 back", On the front side, the basic repeating unit for the arrangement of the three types of blades is, from the base of the saw blade to the tip, "face 1", "face 2", and "face 3", or "face 1", "face 3", and "face 2", or further, "face 1", "face 2", "face 3", "face 1", "face 3", and "face 2".

[0028] The saw according to the first embodiment of the present invention has three types of blades arranged as shown in Figures 3(A), (B), and (C). Figure 3(A) is a diagram showing an arrangement of the front and back of the three types of blades. Figure 3(B) is a diagram showing an alternate arrangement of the three types of blades on the front and back based on the arrangement table of the front and back shown in Figure 3(A). Figure 3(C) is a view taken along the arrows IIIc-IIIc in Figure 3(B).

[0029] As shown in Figure 3(A), the saw according to the first embodiment of the present invention has a configuration in which the front side is arranged in a basic repeating unit of "1" blades with an outer set, "3" blades with an inner set, and "2" neutral blades, from the base to the tip, while the back side is arranged in a basic repeating unit of "1" blades with an outer set, "2" neutral blades, and "3" neutral blades, from the base to the tip. Furthermore, when the front side and back side arrangements are alternately arranged in a line, the saw blade is arranged in a basic repeating unit of "1 back side," "1 front side," "2 back side," "3 front side," "3 back side," and "2 front" from the base to the tip of the saw blade, as shown in Figures 3(B) and (C). In this configuration, "3 front side" and "3 back side" are arranged between "2 back side" and "2 front."

[0030] When cutting wood with a saw that repeats the basic repeating unit of "1 back," "1 front," "2 back," "2 front," "1 back," "1 front," "3 back," and "3 front" (an arrangement of two or four types of blades) shown in Figures 2 and 3 of Patent Document 1, there is an uneasy feeling of intermittent catching when the sawing force weakens. As mentioned above, this uneasy feeling occurs when the cutting point is changed from an outer clasp blade to an inner clasp blade, causing the inner clasp blade to dig deeply into the wood. In contrast, when cutting wood with a saw configured to repeat the basic repeating unit of "1 back," "1 front," "2 back," "3 front," "3 back," and "2 front" (an arrangement of three times the types of blades in equal proportions) according to an embodiment of the present invention, the uneasy feeling of intermittent catching is significantly reduced.

[0031] The reason why the saw blade arrangement of the present invention does not cause any discomfort or snagging is thought to be because the present invention uses an arrangement of three types of blades, whereas conventional saw blade arrangements have used two or four types of blades.

[0032] Furthermore, in the present invention, the outer blades "1 back" and "1 front" were arranged by deleting one pair from the two pairs in Patent Document 1 (conventional), but it was found that the expected stiffness did not occur despite the reduction of one pair of "1 back" and "1 front". It is assumed that the absence of stiffness is due to the equalization of the ratio of the three types of blades.

[0033] Table 1 shows the percentage of one type of blade in the three types of arrangements in each saw of the present invention and the saw of Patent Document 1, as well as the differences between the two saws.

[0034] In the configuration of Patent Document 1, the basic unit of arrangement has two pairs of "1 back" and "1 front" (outer clam blades), with 50% being "1 back" and "1 front", 25% being "2 back" and "2 front", and 25% being "3 back" and "3 front".

[0035] In contrast, for saws in this embodiment where the basic repeating arrangement is "1 front", "1 back" (blade with outer clasp), "2 front", "2 back" (blade without clasp), "3 front", and "3 back" (blade with inner clasp), the overall ratio is 33.3% for "1 back" and "1 front", 33.3% for "2 back" and "2 front", and 33.3% for "3 back" and "3 front".

[0036] [Table 1]

[0037] Table 2 and Graph 1 show the difference in sharpness between the saw of the present invention and the saw of Patent Document 1.

[0038] Furthermore, a moso bamboo was cut multiple times using a saw repeating an arrangement of basic repeating units of "1 back," "1 front," "2 back," "3 front," "3 back," and "2 front" according to the present embodiment, and then a live apple branch with a diameter of 350 mm to 450 mm was cut multiple times. The number of sawing passes until each cut of the live apple branch was counted. Similarly, the number of sawing passes until each cut of the live apple branch was counted under the same conditions using the saw shown in Figures 2 and 3 of Patent Document 1. The saw of the present embodiment cut the branch in some cases with approximately 25% fewer sawing passes and in other cases with 16.67% fewer sawing passes. Compared to the configuration of Patent Document 1, the sawing depth of the present embodiment was reduced by 16.67% for "1 back" and "1 front," which have a smaller sawing depth, while the sawing depth of "2 back" and "2 front," which are greater than "1 back" and "1 front," increased by 8.33%. The sawing depth of "3 back" and "3 front," which are even greater than "2 back" and "2 front," increased by 8.33%. The improvement in sharpness seen by reducing the two pairs of "one front" and "one back" by one pair is an unexpected effect.

[0039] [Table 2]

[0040] [Graph 1] TIFF2025135725000004.tif57134

[0041] In the following second to twelfth embodiments, the outer blades "1 front" and "1 back" are arranged in such a way that one pair is removed from the two pairs in Patent Document 1 (conventional), and they have the same technical effect as the saw according to the first embodiment.

[0042] [Second embodiment] Figure 4(B) shows a side view of a saw with three types of blades formed according to the blade front and back arrangement table shown in Figure 4(A). Figure 4(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 4(B).

[0043] In the saw according to the second embodiment of the present invention, as shown in Fig. 4(A) , the basic repeating units of the arrangement of the three types of blades on the back side are "1 back," "3 back," and "2 back," and the basic repeating units of the three types of blades on the front side are "1 front," "2 front," and "3 front," which are shifted by one blade forward from the basic repeating unit on the back side. This arrangement is the reverse of the front and back arrangement of the saw according to the first embodiment.

[0044] The arrangement of the front and back faces of the three types of blades in the saw according to the second embodiment of the present invention is configured to be repeated from the base end of the saw blade to the tip end as a basic repeating unit of "1 front," "1 back," "2 front," "3 back," "3 front," and "2 back," as shown in Figures 4(B) and 4(C). In other words, following "1 front" and "1 back," "3 back" and "3 front" are arranged between "2 front" and "2 back."

[0045] [Third embodiment: Figure 5] Figure 5(B) shows a side view of a saw with three types of blades formed according to the blade front and back arrangement table shown in Figure 5(A). Figure 5(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 5(B).

[0046] In the saw of the third embodiment of the present invention, as shown in the front and back arrangement table of the three types of blades in Figure 5(A), the basic repeating unit of the three types of blades on the back side is an arrangement of ``1 back,'' ``2 back,'' and ``3 back,'' and the basic repeating unit of the arrangement of the three types of blades on the front side is an arrangement of ``1 front,'' ``3 front,'' and ``2 front,'' which is shifted by one blade toward the tip of the basic repeating unit on the back side.

[0047] In a saw according to a third embodiment of the present invention, the three types of front blades and the three types of back blades are arranged as a basic repeating unit of "1 front," "1 back," "3 front," "2 back," "2 front," and "3 back" from the base end of the saw blade to the tip end, as shown in Figures 5(B) and 5(C). In other words, following "1 front" and "1 back," "2 back" and "2 front" are arranged between "3 front" and "3 back."

[0048] [Fourth embodiment: Figure 6] Figure 6(B) shows a side view of a saw with three types of blades formed according to the blade front and back arrangement table shown in Figure 6(A). Figure 6(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 6(B).

[0049] In a saw according to a fourth embodiment of the present invention, as shown in Fig. 6(A) , the basic repeating units of the three types of blades on the back side are arranged as "1 back," "3 back," and "2 back," and the basic repeating units of the three types of blades on the front side are arranged as "1 front," "2 front," and "3 front," which are shifted by one blade forward from the basic repeating unit on the back side. This arrangement is the reverse of the front and back arrangement of the saw according to the third embodiment.

[0050] In a saw according to a fourth embodiment of the present invention, the three types of front blades and the three types of back blades are arranged as a basic repeating unit of "1 back," "1 front," "3 back," "2 front," "2 back," and "3 front" from the base end of the saw blade to the tip end, as shown in Figures 6(B) and 6(C). In other words, following "1 front" and "1 back," "2 front" and "2 back" are arranged between "3 back" and "3 front."

[0051] [Fifth embodiment: Figure 7] Figure 7(B) shows a side view of a saw with three types of blades formed according to the blade front and back arrangement table shown in Figure 8(A). Figure 7(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 7(B).

[0052] In the saw of the fifth embodiment of the present invention, as shown in the front and back arrangement table of the three types of blades in Figure 7(A), the basic repeating unit of the three types of blades on the back side is an arrangement of ``1 back,'' ``2 back,'' and ``3 back,'' and the basic repeating unit of the arrangement of the three types of blades on the front side is an arrangement of ``1 front,'' ``2 front,'' and ``3 front,'' which is shifted by one blade toward the base side from the basic repeating unit on the back side.

[0053] Therefore, the saw of the fifth embodiment of the present invention is configured so that the basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is "1 back," "1 front," "2 back," "2 front," "3 back," and "3 front" from the base end of the saw blade to the tip end, as shown in Figures 7(B) and (C).

[0054] [Sixth embodiment: Figure 8] Figure 8(B) shows a side view of a saw with three types of blades formed according to the blade front and back arrangement table shown in Figure 8(A). Figure 8(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 8(B).

[0055] In a saw according to a sixth embodiment of the present invention, the basic repeating units of the three types of blades on the back side are arranged as "1 back," "2 back," and "3 back," and the basic repeating units of the arrangement of the three types of blades on the front side are arranged as "1 front," "2 front," and "3 front," which are shifted by one blade forward from the basic repeating unit on the back side. This arrangement is the reverse of the front and back arrangement of the saw according to the fifth embodiment.

[0056] Therefore, the saw of the sixth embodiment of the present invention is configured such that the basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is "1 front," "1 back," "2 front," "2 back," "3 front," and "3 back" from the base side of the saw blade to the tip side, as shown in Figures 8(B) and (C).

[0057] [Seventh embodiment: Figure 9] Figure 9(B) shows a side view of a saw with three types of blades formed according to the blade front and back arrangement table shown in Figure 9(A). Figure 9(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 9(B).

[0058] In the saw of the seventh embodiment of the present invention, as shown in the front and back arrangement table of the three types of blades in Figure 9(A), the basic repeating unit of the arrangement of the three types of blades on the back side is an arrangement of ``1 back,'' ``3 back,'' and ``2 back,'' and the basic repeating unit of the three types of blades on the front side is an arrangement of ``1 front,'' ``3 front,'' and ``2 front,'' which is shifted by one blade toward the base side from the basic repeating unit on the back side.

[0059] Therefore, the saw of the seventh embodiment of the present invention is configured so that the basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is "1 back," "1 front," "3 back," "3 front," "2 back," and "2 front" from the base end of the saw blade to the tip end, as shown in Figures 9(B) and (C).

[0060] [Eighth embodiment: Figure 10] Figure 10(B) shows a side view of a saw with three types of blades formed according to the blade front and back arrangement table shown in Figure 10(A). Figure 10(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 10(B).

[0061] In the saw according to the eighth embodiment of the present invention, as shown in Fig. 10(A) , the basic repeating units of the three types of blades on the back side are arranged as "1 back," "3 back," and "2 back," and the basic repeating units of the three types of blades on the front side are arranged as "1 front," "3 front," and "2 front," which are shifted by one blade toward the base side relative to the basic repeating unit on the back side. This arrangement is the reverse of the front and back arrangement of the saw according to the seventh embodiment.

[0062] Therefore, the saw of the eighth embodiment of the present invention is configured so that the basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is "1 back," "1 front," "3 back," "3 front," "2 back," and "2 front" from the base end of the saw blade to the tip end, as shown in Figures 10(B) and (C).

[0063] In the following ninth and tenth embodiments, the basic repeating unit of the arrangement of three types of blades on the back side is a combination of "1 back", "2 back", "3 back" and "1 back", "3 back", "2 back" from the base side to the tip side of the saw blade, On the front side, the basic repeating unit for the arrangement of three types of blades is shifted by one blade toward the base or tip side compared to the basic repeating unit on the back side, and from the base side to the tip side of the saw blade, it is configured as a combination of "1 face", "2 face", "3 face" and "1 face", "3 face", "2 face".

[0064] [Ninth embodiment: FIG. 11] Figure 11(B) shows a side view of a saw with three types of blades formed according to the blade front and back arrangement table shown in Figure 10(A). Figure 11(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 11(B).

[0065] In the saw of the ninth embodiment of the present invention, as shown in the front and back arrangement table of the three types of blades in Figure 11(A), the basic repeating unit of the three types of blades on the back side is arranged as "1 back", "2 back", "3 back", "1 back", "3 back", "2 back", and the basic repeating unit of the arrangement of the three types of blades on the front side is arranged as "1 back", "2 back", "3 back", "1 back", "3 back", "2 back", which is shifted by one blade forward compared to the basic repeating unit on the back side.

[0066] Therefore, the saw according to the ninth embodiment of the present invention has a configuration in which the basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is "1 front," "1 back," "2 front," "2 back," "3 front," "3 back," "1 front," "1 back," "3 front," "3 back," "2 front," "2 back," as shown in Figures 11(B) and 11(C) from the base end to the tip end of the saw blade. Note that the front and back arrangements may also be reversed.

[0067] [Tenth embodiment: Figure 12] Figure 12(B) shows a side view of a saw with three types of blades formed according to the blade front and back arrangement table shown in Figure 12(A). Figure 12(C) is a front view showing the three-dimensional shape of the blades arranged as shown in Figure 12(B).

[0068] In the saw of the tenth embodiment of the present invention, as shown in the front and back arrangement table of the three types of blades in Figure 12(A), the basic repeating unit of the three types of blades on the back side is arranged as "1 back", "2 back", "3 back", "1 back", "3 back", and "2 back", and the basic repeating unit of the arrangement of the three types of blades on the front side is arranged as "1 front", "3 front", "2 front", "1 front", "2 front", and "3 front", which is shifted by one blade toward the base side from the basic repeating unit on the back side.

[0069] Therefore, in the saw according to the tenth embodiment of the present invention, the basic repeating unit for the arrangement of the three types of front blades and the three types of back blades is "1 front," "1 back," "3 front," "2 back," "2 front," "3 back," "1 front," "1 back," "2 front," "3 back," "3 front," "2 back," as shown in Figures 12(B) and 12(C) from the base end to the tip end of the saw blade. Note that the front and back arrangements may also be reversed.

[0070] Table 3 shows the front arrangement of the saw, showing 36 combinations of "outside clasp", "no clasp" and "inside clasp", including the above-mentioned embodiment, and the back arrangement, which is shifted one blade towards the tip side from the front arrangement. There are also 36 combinations of the back arrangement, which is shifted one blade towards the base side from the front arrangement.

[0071] On the back side of Table 3, the basic repeating unit of the three types of blade arrangement is "1 back", "2 back", "3 back" from the base side of the saw blade to the tip side, or "2 back", "3 back", "1 back", or "3 back", "1 back", "2 back". On the front side, the basic repeating unit for the arrangement of the three types of blades is one blade shifted toward the base or tip side compared to the basic repeating unit on the back side, and the arrangement from the base side to the tip side of the saw blade is either "1 face", "2 face", "3 face", "1 face", or "3 face", "1 face", "2 face".

[0072] [Table 3]

[0073] In addition, the present invention also includes cases where the saw blade ends at the base end and / or tip end in the middle of an arrangement of ``1 face,'' ``2 face,'' or ``3 face,'' in the middle of an arrangement of ``2 face,'' ``3 face,'' or ``1 face,'' or in the middle of an arrangement of ``3 face,'' ``1 face,'' or ``2 face.''

[0074] Furthermore, the present invention also includes a saw blade having a length of 60 cm, with a 15 cm range from the tip having alternating set blades on the front and back, a 15 cm range from the base having alternating set blades on the front and back, and a 30 cm range in the middle having three types of set blades - set blades, set blades, and set blades - on the front and back of the saw body as a basic repeating unit. Furthermore, the present invention is not limited to hand saws, but can also be applied to power saws (reciprocating saws, saber saws, circular saws). [Explanation of symbols]

[0075] 1 front, 1 back...Blade with outer clasp 2 front, 2 back...neutral blade (no clasp) 3 Front, 3 Back...Blade with inner clasp

Claims

1. A blade with an outer set protruding from the surface of the saw blade is called "1-omote"; A blade with an outer set protruding from the back of the saw blade is called "1ura"; A neutral blade in which the top and surface of the blade are aligned with the surface of the saw blade and the back side of the blade is inclined toward the top of the blade is called a "2-table" blade. A neutral blade in which the top and back of the blade coincide with the back of the saw body and the front side of the blade is inclined toward the top of the blade is called "2-ura"; A blade with an inner set where both the back and front surfaces of the blade are inclined toward the top of the blade and the top of the blade is closer to the surface than the middle in the thickness direction of the saw blade is called "3-Omote"; A blade with an inner set where both the back and front of the blade are inclined toward the top of the blade and the top of the blade is closer to the back than the middle of the thickness of the saw blade is designated as "3 back". A saw in which the front blades and back blades are arranged alternately, On the back side, the basic repeating unit of the arrangement of the three types of blades is, from the base side to the tip side of the saw blade, "1 back", "2 back", "3 back", or "2 back", "3 back", "1 back", or "3 back", "1 back", "2 back", or a combination of "1 back", "2 back", "3 back" and "1 back", "3 back", "2 back", On the front side, the basic repeating unit of the three types of blade arrangement is shifted by one blade toward the base or tip side compared to the basic repeating unit on the back side, and from the base side to the tip side of the saw blade, it is either "1-face", "2-face", "3-face", "1-face", or "3-face", "1-face", "2-face", or a combination of "1-face", "2-face", "3-face" and "1-face", "3-face", "2-face". A saw characterized by:

2. As a basic repeating unit of the arrangement of the three types of front blades and the three types of back blades, the arrangement is repeated as a basic repeating unit of "1 back", "1 front", "2 back", "3 front", "3 back", "2 front" from the base side to the tip side of the saw blade, or the arrangement is repeated as a basic repeating unit of "1 front", "1 back", "2 front", "3 back", "3 front", "2 back".

2. The saw of claim 1 .

3. As a basic repeating unit of the arrangement of the three types of front blades and the three types of back blades, the arrangement is repeated as a basic repeating unit of "1 front", "1 back", "3 front", "2 back", "2 front", "3 back" from the base side to the tip side of the saw blade, or the arrangement is repeated as a basic repeating unit of "1 back", "1 front", "3 back", "2 front", "2 back", "3 front".

2. The saw of claim 1 .

4. As a basic repeating unit of the arrangement of the three types of front blades and the three types of back blades, the arrangement is repeated as a basic repeating unit of "1 front", "1 back", "2 front", "2 back", "3 front", and "3 back" from the base side to the tip side of the saw blade, or the arrangement is repeated as a basic repeating unit of "1 back", "1 front", "2 back", "2 front", "3 back", and "3 front".

2. The saw of claim 1 .

5. As a basic repeating unit of the arrangement of the three types of front blades and the three types of back blades, the arrangement is repeated as a basic repeating unit of "1 back", "1 front", "3 back", "3 front", "2 back", "2 front" from the base side to the tip side of the saw blade, or the arrangement is repeated as a basic repeating unit of "1 front", "1 back", "3 front", "3 back", "2 front", "2 back".

2. The saw of claim 1 .

6. As a basic repeating unit of the arrangement of the three types of front blades and the three types of back blades, the arrangement is repeated as a basic repeating unit of "1 back", "1 front", "2 back", "2 front", "3 back", "3 front", "1 back", "1 front", "3 back", "3 front", "2 back", "2 front" from the base side to the tip side of the saw blade, or the arrangement is repeated as a basic repeating unit of "1 front", "1 back", "3 front", "2 back", "2 front", "3 back", "1 front", "1 back", "2 front", "3 back", "3 front", "2 back".

2. The saw of claim 1 .

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