JPH05147646A - Sheet distributing case - Google Patents

Abstract

PURPOSE:To eliminate a problem of fingers being injured by teeth of a cutting member, and make the cutting member disposable together with the case main body for a distributing case with sheet cutting function for wrap films, etc. CONSTITUTION:The title distributing case is equipped with a box shaped case main body 10, a lid plate 17 which is integrally provided with the case main body 10 and closes an opening 15 of the main body case 10, and a cutting member 20 to cut a wrap film W being pulled out from the opening 15, which is provided at the lower edge 18a of a cover lid piece 18 being connected to the leading end of the lid plate 17. For the cutting member 20, after surface swelling a vegetable fiber by a swelling agent, the vegetable fiber is press-bonded to obtain a glued fiber board by removing the swelling agent, and teeth 20a are projected and formed on the hardened fiber board. Also, at least the edge part of the teeth 20a of the cutting member 20 is hardened by carbonization, or a hardening treatment by a synthetic resin is applied, to further improve the cutting function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet distribution case in which various sheets such as synthetic resin wrap films, aluminum foils and kitchen paper sheets used for food packaging are cut into desired lengths for use. In particular, the present invention relates to a sheet distribution case in which a cutting member for cutting the various sheets is made of a material that can be incinerated or recycled.

[0002]

2. Description of the Related Art FIG. 12 is a perspective view showing a conventional resin wrap film distribution case. This conventional example is of the same type as that disclosed in, for example, Japanese Utility Model Publication No. Sho 61-22823. In FIG. 12, reference numeral 1 is a case body made of cardboard, and the case body 1 includes a bottom plate 1a.
And both end plates 1b and 1c, front side plate 1d and back plate 1e
It is a rectangular parallelepiped box having and. Back plate 1e of case body 1
The lid plate 2 is integrally extended to the upper edge part of the back plate 1e, and the boundary portion between the back plate 1e and the lid plate 2 forms a hinge portion 2a having a crease. A cover piece 3 is integrally extended to the tip of the cover plate 2,
A cutting member 4 having saw teeth is provided on the tip edge portion thereof. The film roll 5 having the core wrapped with the wrap film W is housed in the case body 1. The wrap film W is guided from the upper opening 1f of the case body 1 between the front side plate 1d and the covering lid piece 3 and pulled out. After the wrap film W is drawn to a desired length, the case body 1 and the drawn wrap film W are twisted relative to each other, and the saw blade 4a of the cutting member 4 causes the wrap film W to move.
Disconnect.

In the conventional example shown in FIG. 12, an adhesive material 6 is provided as a film retaining means at the central portion of the front surface of the front side plate 1d and where the covering lid piece 3 is overlapped, and the wrap film W after being cut is provided. By pressing with a finger from the outside of the cover lid piece 3 to press it against the adhesive material 6, detent in the case body 1 is prevented.

[0004]

In the conventional distribution case as shown in FIG. 12, the cutting member 4 is made of metal, and is formed into a shape having saw teeth 4a by, for example, stamping a tin plate. This metal cutting member 4 is
It is attached to the back side of the front end portion of the paper-made covering lid piece 3 by means such as caulking fixation or adhesion. In the cutting member made of this metal, the saw teeth 4a make it possible to easily cut the wrap film which is a thin synthetic resin film.

However, since the saw blade 4a of the cutting member 4 made of a metal plate is sharp, there is a risk of damaging a finger or the like during use. Further, when disposing of the distribution case after use, it is necessary to separate the case main body 1, the cover plate 2 and the cover lid piece 3 made of paper from the metal cutting member 4, and then dispose them. Is very troublesome. Further, when the used distribution case is incinerated as inflammable waste without performing the above-described separation treatment of paper and metal, the metal cutting member 4 remains unburned, which causes a problem in waste disposal.

The present invention solves the above-mentioned conventional problems, and eliminates the problem of injuring fingers and the like during use by making the cutting member mainly hard vegetable fibers rather than metal. It is another object of the present invention to provide a sheet distribution case that does not cause a problem in waste disposal when a metal cutting member is used.

[0007]

According to the present invention, various sheets such as a synthetic resin wrap film can be easily cut by using a cutting member made of a specific material, and the cutting member is made equal to the case body. This was done focusing on the fact that it can be disposed of.

According to the present invention based on this attention, a box-shaped case main body, a cover plate which is provided integrally with the case main body and closes the opening of the main body case, and a cover lid piece connected to the tip of the cover plate or In a sheet distribution case having a cutting member which is provided in any of the case bodies and cuts a sheet pulled out from the opening, the cutting member is pressure-bonded after swelling the vegetable fiber with a swelling agent. It is characterized in that it is formed by protruding teeth on the glued fiber board from which the swelling agent has been removed.

Further, by curing at least the edges of the teeth of the cutting member and hardening them or hardening them with a synthetic resin, it is possible to obtain a sheet distribution case having a further excellent sheet cutting function.

Further, it is possible to make the cutting member project in a V shape and attach a reinforcing member having teeth to the tip of the V-shaped portion of the cutting member.

[0011]

In the above means, the swelling agent is removed by swelling the vegetable fiber as the material of the cutting member for cutting various sheets such as the synthetic resin wrap film, and then pressing the swelling agent to remove the swelling agent. Vulcanized fiber plate is used, and teeth such as saw teeth are formed on this glued fiber plate. Since the glued fiber board is thin and hard, the teeth formed on it can easily cut the wrap film sheet or the like. Further, by cutting at least the edges of the teeth of the cutting member made of the glued fiber board or curing the same with a synthetic resin, or by providing a reinforcing member in a part of the cutting member, the cutting function for the wrap film and the like is improved. It will be excellent.

However, since the teeth of the cutting member are not excessive in sharpness of teeth as compared with those obtained by punching out from a tin plate as in the past, there is less risk of the fingers being injured by the teeth during use. Also, since the cutting member is as flammable as the paper material, it is not necessary to separately process the case body when disposing after use, and it is also possible to recycle the cutting member together with the case body. is there.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a distribution case of a wrap film as one embodiment of the present invention, and FIG. 2 is a sectional view thereof. The case body 10 of this distribution case includes a bottom plate 11 and a front side plate 1.
2. Back plate 13, bottom plate 11, front plate 12, and back plate 1
3 is a cube-shaped box having two end plates 14 connecting both end portions, and each of these plate portions covers five surfaces and one upper surface serves as an opening 15. A cover plate 17 extends continuously from the upper edge of the back plate 13 of the case body 10. A boundary portion between the back plate 13 and the lid plate 17 is a hinge portion 16 formed by folding a cardboard as a material. Further, a cover piece 18 is bent at a substantially right angle to the front edge of the cover plate 17 and integrally extends. Further, the left and right end portions of the lid plate 17 and the left and right end portions of the covering lid piece 18 are connected by a side lid piece 19. When the lid plate 17 and the covering lid piece 18 are closed by the case body 10, the side lid piece 19 is placed on the outside of the end plate 14.

A lower edge portion 18a of the cover lid piece 18 is substantially V-shaped, and a cutting member 20 having saw teeth is attached along the lower edge portion 18a. The cutting member 20 is attached to the inner lower portion of the covering piece 18 with the saw teeth 20a facing downward. In this embodiment, the cutting member 20 is made of a glued fiber board, and the other parts, that is, the case body 10, the lid plate 17 integral with the case body 10, the covering lid piece 18, and the side lid piece 19 are all made of cardboard. It is manufactured.

Further, a film retaining portion 21 is formed at a substantially central position on the left and right of the front surface of the front side plate 12, which is covered with the cover lid piece 18 when the cover plate 17 is closed. The film retaining portion 21 includes an adhesive portion 21a provided with an adhesive layer and a resin layer 2 covering the surface thereof in a double circle shape.
1b and. The resin layer 21b is provided so that the area of the adhesive portion 21a is appropriately wide and the wrap film W is formed.
The adhesive force against the wrap film W is adjusted to an appropriate level, so the wrap film W left on the case side after being pulled out and cut
When the wrap film W is to be peeled from the film holding portion 21 in the state where the wrap film W is held in the film holding portion 21, the wrap film W can be easily peeled off without being broken.

The wrap film W is wound around a core in a cylindrical shape, and the wound film roll 5 is housed in a case body 10. The wrap film W is, for example, a vinylidene chloride-based, vinyl chloride-based, polyethylene-based, polypropylene-based, or butadiene-based synthetic resin film.

FIG. 3 shows alone the cutting member 20 used in the wrap film distribution case shown in FIG. The cutting member 20 is formed of a glued fiber (vulcanized fiber) plate. This method for producing a gelatinized fiber board is carried out by press-bonding a vegetable fiber obtained from Kozo, Mitumata, wood pulp, etc. with the surface swelling by a cellulose swelling agent such as zinc chloride or sulfuric acid, and then swelling the same. The agent is removed. Further, a material obtained by impregnating this with a synthetic resin such as urethane resin, phenol resin or epoxy resin to enhance moisture resistance and hardness is preferably used. The thickness of the glued fiber board used as the material of the cutting member 20 is arbitrary depending on the material of the wrap film to be cut, and for example, a thickness of about 0.05 mm to 2.0 mm is used. ..

As shown in FIG. 3, saw teeth 20a are formed on the lower edge of the cutting member 20 made of the glued fiber board. The saw teeth 20a are arranged in a V shape, as shown in FIG.
As shown in FIG. 2, in a state in which the cutting member 20 is fixed to the back surface of the covering lid piece 18 by means such as adhesion or metal fitting, the sawteeth 20a have V-shaped edges 18 of the covering lid piece 18.
It comes to project from a.

In the embodiment of FIG. 3, a plurality of triangular teeth are continuously arranged to form the sawteeth 20a. And V
Of the teeth arranged in a V shape, the tooth (a) located at the V-shaped apex is the largest, the tooth (b) located on both sides thereof is the second largest, and the other teeth ( The shape of c) is smaller than these. By enlarging the shape of the tooth (a) positioned at the apex of the V-shape in this way, when the wrap film W is pulled out from the inside of the case body 10 and cut by the cutting member 20, the tooth (a) is cut by the tooth (a). A cut is easily formed in the center of the film, and the cut allows the wrap film W to be easily cut.

However, the structure of the saw teeth 20a is not limited to the structure shown in FIG. 3, and all the teeth may have the same size. Alternatively, the teeth near the apex of the V-shape may be small, and the middle or both ends of the inclined arrangement portions ((d) portions) on both sides of the apex of the V-shape may be large teeth. Further, the teeth do not necessarily have to be arranged continuously, and a plurality of teeth may be arranged intermittently, or small teeth are continuously arranged in a V-shape. Several may be spaced apart to form larger teeth. Furthermore, the shape of the tooth is
The shape may be an equilateral triangle, an isosceles triangle that projects thinly, or a shape in which the tips of all the teeth of the inclined array portions ((d) portions on both sides) are directed toward the apex direction of the V-shape of the lower edge of the cutting member.
Alternatively, the tips of all the teeth may be arranged so as to face the right edge direction or the left edge direction in FIG.

An example of the arrangement of each tooth of the saw tooth 20a and the shape of the tooth are shown in FIGS. 6 and 7. In the example shown in FIG. 6, the bisector of the tip angle of each tooth of the saw tooth 20a is O1,
It is indicated by O2, ... On. These bisectors O1, O2
Are oriented toward the V-shaped vertices as they approach the vertices of the V-shaped array. That is, for example, O1 is more V than O4
It is inclined toward the top of the letter. Therefore, the tip angle of each tooth becomes acute as it approaches the apex of the V-shaped array. For example, in the case of a wrap film W of vinylidene chloride type or the like, it is difficult to make the cut due to the elongation of the film when the cut is first made in the center of the film,
By making the tips of the teeth located at the apexes of the V-letter at an acute angle, it becomes easier for the wrap film W to be cut by the teeth near the apexes of the V-letter, and effective film cutting can be performed.

Next, in the example shown in FIG. 7, the bisecting lines Oa, O of the tips of the respective saw teeth 20a arranged in a V shape.
All of b, Oc, ... On extend perpendicularly to the direction of the bottom plate 11 of the case body 10. As the cutting operation of the wrap film W, the wrap film W is pulled out from the case main body 10 and pulled substantially horizontally, the case main body 10 is twisted in the α direction in FIG. 2, and the wrap film W is cut by this twisting operation. Is preferred. Therefore, as shown in FIG. 7, bisecting lines Oa, Ob, Oc, ...
By turning On in a direction perpendicular to the bottom plate 11, when the case body 10 is twisted in the α direction, the tooth tips of all the teeth are oriented in the α twist direction, and the wrap film W is It will surely be cut to the edge.

When the cutting member 20 is made of the glued fiber board, the sharpness of the saw teeth 20a is inferior to that of the metal saw teeth. However, as shown in each of the above examples, the tip shape of each tooth and By devising the tip angle or the orientation of the tip, it becomes possible to exert a sufficient cutting function for the wrap film even with a saw tooth made of a glued fiber board. When the teeth of the sawteeth 20a are arranged continuously or at a constant pitch, the arrangement density is preferably in the range of about 2 to 20 per cm.

Next, as a method of cutting the cutting member 20 and the saw teeth 20a from the glued fiber board, press punching, cutting work using a cutter such as pinking scissors, or the like can be adopted. It is also possible to cut out the cutting member 20 and the sawteeth 20a using a laser cutting device. FIG. 4 shows an operation of cutting the sawteeth 20a having the shape shown in FIG. 3 by a laser cutting device. In this work, as shown in FIG. 4, the glued fiber board is cut by a laser beam along the shape of a saw tooth. This work is performed according to a program set in the control unit of the laser cutting device. In FIG. 4, the cutting locus by the laser beam is shown by (e).

FIG. 5 is an enlarged view of a VV cross section showing a saw tooth cut by a laser. As shown in the figure, assuming that the irradiation direction of the laser beam used for cutting is from the direction of the arrow L with respect to the glued fiber board, the teeth of the saw tooth 20a and the space between the teeth are in the irradiation direction L of the laser beam. The shape becomes gradually narrower. Furthermore, in this case, the edge of the tooth is carbonized by the heat of the laser beam as indicated by the reference sign (g).
This carbonization occurs when the fibers of the glued fiberboard are heated to the carbonization temperature. Alternatively, when the synthetic resin is impregnated as described above, carbonization occurs by heating the synthetic resin to the carbonization temperature. This carbonization makes it difficult for fibers to be curled up at the tooth edges, and the tooth edges themselves are hardened to improve the tooth cutting function.

When the cutting member 20 cut by the laser beam is used, it is preferable to attach it to the cover piece 18 with the upper surface in FIG. 5 facing the wrap film W, and the upper edge portion in FIG. By hitting the wrap film W, the wrap film W can be easily cut. This is the same when the saw teeth 20a are formed by press punching. For example, when the teeth are press punched from the same direction as the irradiation direction of the laser beam L shown in FIG. 5, the wrap film on the upper side in FIG. It is preferable to attach the cover lid piece 18 so as to face W. Even when the saw teeth 20a are formed by press punching or the like, it is effective to carbonize and harden the edges of the teeth to improve the cutting function. As a carbonization treatment method in this case, after the cutting member 20 and the saw teeth 20a are punched out from the glued fiber board, flames such as a burner may be emitted to carbonize the edges of the teeth.

The method of increasing the strength of the teeth of the saw teeth 20a to improve the cutting function is not limited to the above carbonization treatment, but may be impregnation or coating with a resin. In the above description of the process for manufacturing the glutenized fiberboard, the fibers are pressure-bonded to remove the swelling agent, and then the entire fiberboard is impregnated with the synthetic resin to enhance the hardness. It is not always necessary to impregnate the whole fibrous board. For example, the synthetic resin may be impregnated into the tooth edges or the entire tooth portion of the saw tooth 20a after molding the saw tooth 20a. Alternatively, the tooth forming portion of the glued fiber board may be impregnated with a synthetic resin in a band shape, and the saw tooth 20a may be cut at the impregnated portion. Alternatively, the edges of the teeth may be coated with a synthetic resin. Further, the carbonization treatment described above may be performed in combination with the impregnation or coating of this resin.

Next, a method of using the distribution case of the wrap film will be described. The wrap film W drawn from the film roll 5 in the case body 10 is guided to the outside from the opening 15 of the case body 10 through the space between the front plate 12 and the cover piece 18. Wrap film W of desired length
When the sheet is pulled out, the wrap film W is spread on the article to be packaged such as a tray in a substantially horizontal state. Then, press the lid plate 17 or the cover lid piece 18 with one hand,
Covers the opening 15, so that the cover lid piece 18 overlaps the front side of the front side plate 12 and the side cover piece 19 overlaps the outside of the end plate 14. With the other hand, the wrap film W is pulled horizontally, and the case is slightly twisted in the α direction shown in FIG. As a result, a cut is made in the center of the wrap film W by the center teeth of the saw teeth of the cutting member 20 arranged in the V shape (for example, the teeth (a) and (b) in the example of FIG. 3), and the cutting trigger. Is made. When the wrap film W is pulled in the horizontal direction as it is, the wrap film W is cut into a substantially V shape along the saw blades arranged in a V shape. Of the wrap film W that has been cut and left on the case body side, the front side plate 12 and the cover lid piece 1
The portion sandwiched between 8 and 8 is held by being adhered to the adhesive portion 21a of the film retaining portion 21 shown in FIG. The saw teeth 20a of the cutting member 20
The shape of is not limited to the embodiments shown in FIGS. 1, 6 and 7.

The cutting member 20 shown in FIG. 8 is formed in a band shape having V-shaped parallel edges as a whole.
This cutting member 20 is formed of a glued fiber board as described above, and the tooth (a) located at the apex of the V-shaped array is large and the teeth (b) on both sides thereof are next large, The other teeth (c) have a small triangular shape. In the embodiment of FIG. 8, a small piece of reinforcing member 31 is attached to the back side of the central portion of the cutting member 20 formed of a glued fiber board.
The reinforcing member 31 is made of metal or synthetic resin,
Saw teeth 31a having the same shape as the saw teeth 20a of the cutting member 20 are formed on the lower edge thereof. The saw teeth 31a are continuously arranged in a V shape, and have the same size and shape as the saw teeth (a), (b), and (c) of the cutting member 20.
(C) is provided. When the reinforcing member 31 of this small piece is attached, the sawteeth 31a are made into the sawteeth 20 of the cutting member 20.
It is attached so that the teeth match on the back side of a. As a result, one of the saw teeth 20a of the cutting member 20 formed by the glued fiber board near the center of the V-shaped array is reinforced, and the cutting function for the wrap film W is improved.
It should be noted that after a metal or synthetic resin plate is attached to the cutting member 20, the cutting member 20 and the lower edge of this plate are simultaneously punched or cut with teeth (a), (b), and (c) to reinforce. The member 31 may be formed.

Further, as shown in FIG. 9, small teeth (c) are formed on the lower edge of the cutting member 20 formed of the glued fiber board.
Only, the teeth are not formed at the apexes of the V-shaped edge, and the reinforcing cutting member 32 of a small piece made of a metal plate or synthetic resin is attached to the back surface of the cutting member 20. As the saw tooth 32a, a large tooth (a) and a next large tooth (b) located on both sides thereof may be formed. In this embodiment, with the reinforcing cutting member 32 attached to the back surface of the cutting member 20, the teeth (a) and (b) are projected downward from the center of the lower edge of the cutting member 20.

In the distribution case having the saw teeth arranged in the V-shape as described above, the wrap film W drawn from the inside of the case body 10 is horizontally stretched, and the case body 10 is oriented in the direction indicated by α in FIG. V by twisting
The slits are formed in the film by the teeth (a) and (b) located at the V-shaped vertex of the saw teeth arranged in the shape of a letter,
The wrap film W is cut using this cut as a trigger. Therefore, as shown in FIGS. 8 and 9, by reinforcing the vicinity of the central portion of the cutting member 20 with the reinforcing member 31 or the reinforcing cutting member 32, the central portion of the wrap film W is subjected to the twisting operation in the α direction. It is easy to make a break in the. That is, even if the film is an easily stretchable film such as vinylidene chloride, the reinforcing member 31 or the reinforcing cutting member 3 is used.
By providing No. 2, it becomes easy to make a cut in the center of the film, and a sufficient film cutting effect can be expected even if a cutting member made of a glued fiber board, which is inferior in sharpness to metal saw teeth, is used.

In the embodiment of FIGS. 8 and 9, only the small piece of reinforcing member 31 or 32 is made of metal or synthetic resin, and the cutting member 20 itself is made of glued fiber board. Compared to the conventional example in which the entire sawteeth are formed of a metal plate, there is less risk of scratching the finger during use, and the reinforcing member 31 or 32 is a small piece. It is superior to the conventional one. Further reinforcing member 31 or 3
2 is attached to the cutting member 20 with an adhesive tape or the like, and after use, the reinforcing member 31 or 32 is cut from the cutting member 20.
If it can be easily peeled off, the reinforcing member 31 made of metal or resin can be disposed in the disposal process after use.
Or the separation process of 32 becomes easy.

The cutting member formed of the glued fiber board is a V-shaped lower edge 18a of the cover piece 18 as shown in FIG.
However, the present invention is not limited to this, and for example, as in the conventional example shown in FIG. 12, a cutting member having saw teeth arranged in a straight line in which the edge of the cover lid piece 3 has a linear shape. Even when it is provided on the covering lid piece 3, the cutting member formed of the above-mentioned glued fiber board can be used.

Further, as shown in FIG. 10, a cutting member 20A made of a glued fiber board is attached to a bottom plate 11A of a case body 10A made of cardboard by means such as adhesion, and its saw teeth 20B are attached to the front side plate 12A. It may be projected forward from the lower edge. Alternatively, as shown in FIG.
A cutting member 20A formed of a glued fiber board may be attached to the inside of the upper edge of the front plate 12A of the case body 10A so that the saw teeth 20B project upward from the upper edge of the front plate 12A. Further, the distribution case according to the present invention is not only suitable for cutting the synthetic resin wrap film W, but can be used for cutting various sheets such as aluminum foil and kitchen paper sheets.

[0035]

As described above, according to the present invention, since the cutting member for cutting the sheet is made of the glued fiber board, the saw teeth are excessively sharp like the cutting member made of the conventional metal plate. It does not become a thing, so that it does not damage the finger etc. during use. Further, since the gelatinized fiber board is mainly composed of vegetable fibers, it becomes possible to dispose of the waste together with the case body made of paper.

Further, carbonization of the teeth of the cutting member with the glued fiber board, hardening treatment with resin, or provision of a reinforcing member makes it possible to further improve the cutting function by the teeth.

[Brief description of drawings]

FIG. 1 is a perspective view showing a distribution case of a wrap film as an example of an embodiment of the present invention,

2 is a sectional view of the distribution case shown in FIG. 1,

3 is a front view showing the cutting member alone attached to the distribution case of FIG. 1,

FIG. 4 is an explanatory view of a cutting process showing a case where a laser beam is used as an example of cutting out saw teeth of a cutting member,

5 is an enlarged view of a VV cross section showing a tooth cut by the process of FIG. 4;

FIG. 6 is an enlarged view showing another example of the sawtooth shape of the cutting member,

FIG. 7 is an enlarged view showing another example of the sawtooth shape of the cutting member,

FIG. 8 is a perspective view illustrating another shape of the cutting member,

FIG. 9 is a perspective view illustrating another shape of the cutting member,

FIG. 10 is a perspective view showing another embodiment of the attachment position of the cutting member,

FIG. 11 is a perspective view showing still another embodiment of the attachment position of the cutting member,

FIG. 12 is a perspective view showing a conventional wrap film distribution case;

[Explanation of symbols]

 W Wrap film 5 Film roll 10 Case body 11 Bottom plate 12 Front side plate 13 Back plate 14 End plate 15 Opening 16 Hinge part 17 Lid plate 18 Covering piece 19 Side lid piece 20 Cutting member 20a Saw tooth 31, 32 Reinforcing member

Claims (4)

[Claims] 1. A box-shaped case main body, and a cover plate which is provided integrally with the case main body and closes an opening of the main body case,
In a sheet distribution case having a covering piece connected to the tip of this cover plate or a cutting member provided in either of the case body and cutting a sheet pulled out from the opening, the cutting member is a plant-based material. A sheet distribution case characterized in that a tooth is formed to project on a glued fiber board from which fibers have been surface-swelled with a swelling agent and then pressure-bonded to remove the swelling agent. 2. The sheet distribution case according to claim 1, wherein at least edges of the teeth of the cutting member are carbonized and hardened. 3. The sheet distribution case according to claim 1, wherein at least edges of the teeth of the cutting member are hardened with a synthetic resin. 4. The sheet distribution case according to claim 1, wherein the cutting member has a V-shaped protruding shape, and a reinforcing member having teeth is attached to the tip of the V-shaped portion of the cutting member. ..