JP2015101013A - Throw-away blade of graver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw-away blade of a graver which has flexible combination thereof.SOLUTION: A throw-away blade of a graver includes a main body 10, a right cut edge 12, a left cut edge 13, and a tip cut part 14. The main body 10 has a center seat hole 11 formed at a center thereof. The right cut edge 12 and the left cut edge 13 are positioned on both sides of a straight center line 15 passing a center of the center seat hole 11 of the main body, and form a V-shape. The tip cut part 14 is formed at an end part of the main body in which a distance between the right cut edge 12 and the left cut edge 13 is the narrowest. A virtual apex as a virtual point, at which a virtual extension line of the right cut edge 12 and a virtual extension line of the left cut edge 13 cross each other, is deviated on one side of the center lin 15 by a predetermined distance.

Description

  The present invention relates to a sword, and more particularly to a disposable blade of a sword.

  Conventional engraving swords are mainly used for engraving characters, figures, patterns, and the like on metal surfaces. What is shown in FIGS. 13 to 15 is a conventional engraving knife 30 using a carbonized material as a whole. The carving sword 30 has two parts, a blade 31 and a blade part 32. The blade portion 32 is constituted by a flat top surface 321 of the center line 320, a right side 322, a sandwich angle surrounded by the left side 323, and a tip cut portion 324 having an angle of at least 5 ° with respect to a horizontal plane provided at the end. The FIG. 15 is an enlarged view of a main part of the blade part 32. There is an appropriate eccentricity e between the center line 320 of the blade part 32 and the blade center line 310 of the blade 31, and the distance between the end of the tip cut part 324 and the blade center line 310 is the groove width radius Y. It is. The groove width cut by the engraving sword is 2Y. Since the engraving sword 30 has a small amount of cutting, it has a cutting ability only in the single right side 322 and the distal end cutting part 324 mainly by the design of the eccentricity e of the blade part 32, and is engraved in a shallow layer. Work such as engraving of symbols.

  However, the engraving sword 30 designs different eccentricity e according to different cutting groove widths. The value of e is 0.01 to 0.06 mm, and the value of the groove width radius Y is 0.05 to 0.3 mm. The combination of e and Y values of the conventional engraving knife 30 is e = 0.01, Y = 0.05; e = 0.02, Y = 0.1; e = 0.03, Y = 0.15; e = 0.04, Y = 0.2; e = 0.05, Y = 0.25; e = 0.06, Y = 0.3, and the like. If a combination error occurs, the tip cut portion 34 may be excessively eccentric and cutting may not be possible. What is shown in FIG. 16 is a combination of e = 0.03, Y = 0.05 (and cutting groove width = 0.1 mm), and if the eccentricity e is too wide, the entire tip cut portion 324 is shown. Is located on the right side of the blade center line 310, and the left side 323 having no cutting ability is extended to the right side of the blade center line 310, so that the engraving blade 30 cannot be cut smoothly and is not aligned. And the phenomenon that the blade breaks easily occurs. Therefore, only one kind of groove width radius Y can be combined with one kind of eccentricity e, and depending on the processing of different cutting groove widths, consumers can engrave with different eccentricity e (or different groove width radius Y) The sword 30 must be purchased.

  As shown in FIG. 13 to FIG. 15, it is necessary to polish the cutting edge using an apparatus after the tip cut portion 324 and the right side 322 are blunted, but grinding is very difficult because the tip cut portion 324 is very small. . Both the right side 322 and the left side 323 need to be ground, and the amount of grinding is very precise. If wrong, the eccentricity e of the center line 320 of the blade part 32 and the blade center line 310 changes. When the degree of eccentricity e increases, the distal end of the tip cut portion 324 and the groove width radius Y value of the blade center line 310 are affected, and the tip cut portion 34 is excessively biased to the right and positioned on the right side of the blade center line 310. Accordingly, the left side 323 having no cutting ability is extended to the right side of the blade center line 310 (see FIG. 16), and the engraving blade 30 cannot be cut smoothly. Therefore, the polishing technique for engraving swords is difficult, and the rate of occurrence of polishing errors is high.

  FIG. 17 shows a sword 40 having a disposable structure. The sword 40 has a blade 41, a sword holder 42 is provided at the end of the blade 41, and the sword holder 42 has a screw hole. 421. The center position of the screw hole 421 and the blade center line 400 have a minute bias value e. The disposable blade 50 of the engraving sword is screwed into the screw hole 421 of the engraving blade holder 42, and the disposable blade 50 of the engraving sword has a rhombus appearance. The blade 50 has a right cut edge 51 and a left cut edge 52 at one end, and forms a V shape. A tip cut portion 53 is provided at the end of the V shape. The left cut edge 52 and the right cut edge 51 are located symmetrically, and the intersection of the left cut edge 52 and the right cut edge 51 is located at the center line 500 of the disposable blade 50 of the engraving knife.

  The layer hole 54 screwed into the disposable blade 50 of the engraving knife is located at the center position of the disposable blade 50 of the engraving knife. The layer hole 54 corresponds to the screw hole 421, and the center line 500 passes through the screw hole 421 and the center position of the layer hole 54. When the engraving knife disposable blade 50 is screwed onto the engraving knife holder 42, a groove width radius Y is formed at the blade edge of the tip cutting portion 53 and the blade center line 400, and the cutting ability is applied to the right cut edge 51 and the tip cutting portion 53 on one side. Have The disposable blade 50 of the sword having different groove width radii Y needs to be combined with the sword holder 42 having different eccentricity e. After the blade of the disposable sword 40 is blunted, the new sword disposable blade 50 is replaced directly without re-polishing. However, the disposable blade 50 of the engraved sword needs to be combined with an appropriate degree of eccentricity e of the engraved sword holder 42 based on different groove width radii Y. It is necessary to control so that the left cut edge 52 without the cutting function is not biased to the right side of the blade center line 400.

JP 2002-52896 A

The conventional engraving sword is manufactured by polishing the entire object using a carbide material. When the tip cut portion is worn, it is necessary to polish it again. However, since the amount of grinding is small, accuracy control is necessary. If it is wrong, the tip cutting part and the position of the cutting edge without cutting ability are mistakenly arranged, causing a problem that cutting is impossible. Further, the eccentricity e of the cutting edge needs to be combined with the groove width radius Y to be cut. If it is wrong, the positions of the cut edge and the tip cut portion having no cutting ability are different, and cutting is impossible. Further, the disposable sculpture sword does not need to polish the edge, but it is necessary to combine the eccentricity e of the blade and the groove width radius Y. There is a possibility that the position is wrong and cutting is impossible.
This invention is made | formed in view of the said problem, The objective is to provide the disposable blade of the engraving knife with the flexibility of a combination.

The disposable blade of the engraving sword of the present invention includes a main body, a right cut edge, a left cut edge, and a tip cut portion. The main body has a central seat hole in the center. The right cut edge and the left cut edge are located on both sides of the center line, which is a straight line passing through the center of the central seat hole of the main body, and form a V shape. The tip cut portion is formed at the end of the main body where the distance between the right cut edge and the left cut edge is the narrowest. A virtual vertex, which is a virtual point where the virtual extension line of the right cut edge and the virtual extension line of the left cut edge intersect, is biased a predetermined distance toward one side of the center line.
In addition, in a virtual plane that is a plane orthogonal to the center line, the distance between the right cut edge and the center line is different from the distance between the left cut edge and the center line.
Furthermore, one of the right cut edge and the left cut edge, which is located closer to the virtual vertex than the center line, is formed longer than the other.

  The disposable blade of the engraving sword of the present invention is such that the point where the right cut edge and the left cut edge intersect is biased to one of the center lines of the blade, so that the effective cut portion (right cut edge and tip cut portion) of the engraved sword is eccentric. A cutting operation is performed with a single blade having a degree e. The disposable blade of the sculpture sword can be used with a non-eccentric blade or a combination of eccentric knives, and a single blade can be used by selecting and combining disposable blades with different eccentricity e. Simple, flexible in combination, and cost saving.

It is a top view which shows the disposable blade of the engraving sword by one Embodiment of this invention. It is a principal part enlarged view which shows the front-end | tip cut part of the disposable blade of the engraving sword by one Embodiment of this invention. It is a top view which shows the blade of the disposable blade of the engraving knife by one Embodiment of this invention. It is a top view which shows the state which combined the disposable blade of the engraving sword by one Embodiment of this invention with the blade. It is a schematic diagram which shows the state which made eccentricity e of the disposable blade of the engraving knife by other embodiment of this invention 0.01 mm. It is a principal part enlarged view of FIG. It is a schematic diagram which shows the state which made eccentricity e of the disposable blade of the engraving knife by other embodiment of this invention 0.02 mm. It is a principal part enlarged view of FIG. It is a figure which shows the state which made eccentricity e of the disposable blade of the engraving knife by other embodiment of this invention 0.03 mm. It is a principal part enlarged view of FIG. It is a schematic diagram which shows the state which combined the disposable blade of the engraving knife with eccentricity and the blade with eccentricity by other embodiment of this invention. It is a principal part enlarged view of FIG. It is a top view which shows the conventional engraving sword. It is a side view which shows the conventional engraving sword. It is a principal part enlarged view which shows the conventional engraving sword. It is a figure which shows the state which the edge part of the front-end | tip biased too much right because the eccentricity of the centerline of the conventional blade part was excessive. It is a top view which shows the disposable blade of the conventional engraving sword.

(One embodiment)
The disposable blade of the engraving sword of the present invention shown in FIGS. 1 and 2 includes a main body 10, a right cut edge 12, a left cut edge 13, and a tip cut portion 14. A central seat hole 11 is formed in the main body 10. The central seat hole 11 is located at the center of the blade 10 of the engraving knife. The center line 15 of the blade of the main body 10 passes through the center position. A right cut edge 12 and a left cut edge 13 are formed on the main body 10. The right cut edge 12 and the left cut edge 13 form a V shape. A tip cut portion 14 is formed at the V-shaped end of the main body 10 where the distance between the right cut edge 12 and the left cut edge 13 is the narrowest. Two sets of right cut edge 12 and left cut edge 13 are formed in the main body 10 so as to be symmetric with respect to a plane orthogonal to the center line 15. The two right cut edges 12 and the two left cut edges 13 are parallel to each other. A virtual vertex that is a virtual point where the extension line of the right cut edge 12 and the extension line of the left cut edge 13 intersect forms an eccentricity e on one side of the center line 15. In the plane orthogonal to the center line 15, the distance between the end of the tip cut portion 14 and the center line 15 is defined as a groove width radius Y. The magnitude of the eccentricity e changes according to needs. The right cut edge 12 and the left cut edge 13 are not installed symmetrically, and the intersecting point is biased to one of the center lines 15 of the blade, so the width L1 of the side of the left cut edge 13 of the main body 10 and the right cut edge 12 The width L2 of the sides is different.

  More specifically, the main body 10 is formed in a diamond shape. The virtual vertex of the main body 10 is offset on one side of the center line 15 of the blade to form an eccentricity e. The eccentricity e shown in the present embodiment is located on the right side as shown in FIG. 2, the left cut edge 13 slightly contracts, and the point where the right cut edge 12 and the left cut edge 13 intersect is on the right cut edge 12 side. Can be positioned. Accordingly, the width L2 of the side of the right cut edge 12 is slightly longer than the width L1 of the side of the left cut edge 13. The difference in width varies according to the magnitude of the eccentricity e.

  As shown in FIGS. 3 and 4, the blade 20 is further included. A sword holder 21 is provided at the end of the blade 20. The blade 20 has a blade centerline 200. A screw hole 211 is formed at the center of the engraving blade holder 21. The engraving sword holder 21 is installed without being eccentric. The center of the screw hole 211 of the engraving blade holder 21 passes through the blade center line 200 of the blade 20. The central seat hole 11 of the main body 10 corresponds to the screw hole 211. The main body 10 is screwed into the screw hole 211 of the engraving blade holder 21. When the right cut edge 12 and the left cut edge 13 of the main body 10 are installed asymmetrically, an eccentricity e is generated. The magnitude of the eccentricity e can be changed. The lengths of the right cut edge 12 and the left cut edge 13 of the main body 10 can be made different.

(Other embodiments)
The main body 10 of the present invention shown in FIGS. 5 and 6 is an embodiment in which the eccentricity e is 0.01 mm. The groove width radius Y is 0.05 mm, and the cutting groove width is 0.1 mm. The main body 10 is screwed to the engraving sword holder 21 and is installed on the blade 20 without being eccentric. Since the left cut edge 13 of the main body 10 is on the left side of the blade center line 200, the cutting operation is not affected. When the tip cut portion 14 is blunted, the direction of the main body 10 is changed and replaced with a new tip cut portion 14 or replaced with a new main body 10.

  The main body 10 of the present invention shown in FIGS. 7 and 8 is an embodiment in which the eccentricity e is 0.02 mm. The groove width radius Y is 0.1 mm, and the cutting groove width is 0.2 mm. The main body 10 is screwed to the engraving sword holder 21 and is installed on the blade 20 without being eccentric. Since the left cut edge 13 of the main body 10 is on the left side of the blade center line 200, the cutting operation is not affected. When the tip cut portion 14 is blunted, the orientation of the main body 10 is changed and replaced with a new tip cut portion 14 or replaced with a new engraving blade 10.

  9 and 10 is an embodiment in which the eccentricity e is 0.03 mm. Further, the groove width radius Y is 0.15 mm, and the cutting groove width is 0.3 mm. The main body 10 is screwed to the engraving sword holder 21 and is installed on the blade 20 without being eccentric. Since the left cut edge 13 of the main body 10 is on the left side of the blade center line 200, the cutting operation is not affected. When the tip cut portion 14 is blunted, the direction of the main body 10 is changed and replaced with a new tip cut portion 14 or replaced with a new main body 10.

  The above description is an embodiment of the present invention, and there are a large number of combinations of the eccentricity e and the groove width radius Y, and there are various combinations of the eccentricity e and the groove width radius Y only by requiring the blade 20. There are changes. The user does not need to further distinguish the magnitude of the degree of eccentricity of the blade 20, and convenience can be achieved by use in combination. Further, the main body of the present invention is manufactured by powder metallurgy, and the eccentricity e does not need to be directly molded and polished, so that it can break through the difficulties that become a bottleneck in the production of conventional engraving swords and reduce the production cost. .

  The main body 10 according to another embodiment of the present invention shown in FIGS. 11 and 12 may be combined with an engraved sword holder 21 installed eccentrically. The engraving blade holder 21 has a blade center line 2110 that passes through the center position of the screw hole 211, and the blade center line 2110 and the blade center line 200 of the blade 20 have an eccentricity E. Since the eccentricity E can be set according to needs, when the main bodies 10 having different eccentricities e are combined, the groove width radius Y value is increased by this, and the main body 10 having the same eccentricity e is used. The blade 20 having can change the groove width radius Y value.

  As described above, the present invention goes beyond the traditional sculpted swords made by polishing a carbide blade and further improves the design of the conventional sword disposable blade. This makes it possible to combine various types of disposable blades with different eccentricities in a single blade, saving costs without accidentally attaching the blade of the engraved blade in use. There is no need for a correspondence between the blade and the blade.

10 body,
11 Central seat hole,
12 Right cut edge,
13 Left cut edge,
14 Tip cutting part,
15 Blade centerline,
L1 side width,
L2 side width,
e Eccentricity,
E eccentricity,
Y groove width radius,
20 Blade,
200 Blade centerline,
21 blade holder,
211 screw holes,
2110 The center line of the blade.

Claims (3)

A body with a central seat hole formed in the center;
A right cut edge and a left cut edge which are located on both sides of a center line which is a straight line passing through the center of the central seat hole of the main body and form a V-shape;
A tip cut portion formed at the end of the main body where the distance between the right cut edge and the left cut edge is the narrowest,
A disposable blade of an engraving sword characterized in that a virtual vertex that is a virtual point where a virtual extension line of the right cut edge and a virtual extension line of the left cut edge intersect is deviated by a predetermined distance to one side of the center line.   The disposable blade for a sword according to claim 1, wherein the right cut edge and the left cut edge are asymmetric with respect to the center line. The disposable one of the engraving sword according to claim 2, wherein one of the right cut edge and the left cut edge, which is positioned closer to the virtual vertex side than the center line, is formed longer than the other. blade.

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