KR101973507B1 - Cable insulation removing device - Google Patents

Abstract

A cable insulator removal apparatus is disclosed. An apparatus for removing cable insulation according to an embodiment of the present invention includes: a body; A head unit installed at an upper portion of the body and having an empty accommodation portion; And an insulator removing portion mounted in the accommodating portion to remove the cable insulator, wherein the insulator removing portion includes a first cutting body and a second cutting body having an interlocking structure, and the first cutting body and the second cutting body Each of the bodies has a straight cutter arranged so that a pair of straight blades are parallel to the longitudinal direction of the cable and mutually spaced corresponding to the diameter of the core portion of the cable; And a circular cutter mounted on the rear of the linear cutter and having a semicircular blade along a semicircular concave groove corresponding to the diameter of the core of the cable.

Description

[0001] Cable insulation removing device [0002]

The present invention relates to a cable insulator removal apparatus.

Various cables (for communication and / or power) are connected to various devices (for example, a control box or the like) after removing the end insulator (coating) of the cable after the completion of the installation work. In addition, cable interconnections between cable and cable require removal of the cable insulation.

Removing and wiring the insulation of the cable takes a considerable amount of time. In addition, if the insulator is made of a rigid and rigid material such as XLPE (Cross-Linked Polyethylene) during the process of removing the insulator (coating) protecting the cable conductor, it is necessary to use only a sharp- none. In such a case, handbag accidents frequently occur during the operation.

In the case of using a vibration saw, there is a problem in that although the safety problem is good, the vibration width varies depending on the distance from the rotation center of the vibration to each saw blade, so that the cutting can not be performed properly.

Korean Patent Laid-Open No. 10-2015-0062582 (published on June, 2015) - Composite cable jacket peeling machine

The present invention is to provide a cable insulator removing device which can remove a dielectric insulator by dividing an insulator of a cable end portion into four by using a circular blade and a double straight blade.

The present invention is to provide a cable insulator removing apparatus which improves the cutting quality by solving the internal shaking phenomenon of the removed cloth by maximizing the insulator loading hole space and using a space (gap) between the replaceable circular blade and the straight blade .

The present invention can prevent the hand stuck through the safety cover to enable the safe operation of the insulator cutout portion and to easily adjust the length of the cable end to be cut through the cutter stopper and secure the straightness at the cutting operation of the insulator cutout portion through the side guide The present invention provides a cable insulator removal device that prevents damage to a piston rod due to blade sagging and improves cutting quality.

Other objects of the present invention will become readily apparent from the following description.

According to an aspect of the present invention, A head unit installed at an upper portion of the body and having an empty accommodation portion; And an insulator removing portion mounted in the accommodating portion to remove the cable insulator, wherein the insulator removing portion includes a first cutting body and a second cutting body having an interlocking structure, and the first cutting body and the second cutting body Each of the bodies has a straight cutter arranged so that a pair of straight blades are parallel to the longitudinal direction of the cable and mutually spaced corresponding to the diameter of the core portion of the cable; And a circular cutter mounted behind the linear cutter and having a semicircular blade along a semicircular concave groove corresponding to the diameter of the core of the cable.

The first cutting body may be mounted on a mount moving up and down at a lower portion of the receiving portion, and the second cutting body may be fixedly installed at an upper portion of the receiving portion.

A guide plate fixedly installed on a side surface of the mount; And a guide groove formed on a side surface of the head portion to guide the guide plate up and down.

Further comprising: a safety cover for preventing opening of the receiving space formed by the lifting operation of the mount to the lower space, wherein the safety cover includes: a bellows cover fixed to a lower portion of the head; The upper end may be coupled to the guide plate, and the lower end may be coupled to the bellows cover, and may include a bellows having a plurality of folded structures.

The head portion may further include a status confirmation groove formed on a side surface thereof and capable of confirming a cable cutting state by at least one of the linear cutter and the circular cutter.

Wherein the linear cutter is provided with a deep portion loading groove disposed between the pair of straight blades for loading the remaining portion of the cable that is cut in the vertical direction by the pair of straight blades; A pair of cutaway grooves may be formed on the outer side of the pair of straight blades and on which the insulator cut portions of the cable cut in the vertical direction are cut by the pair of straight blades.

The pair of straight blades may have a vertical plane on the inner side and an outer side may have an inclined plane.

An insertion body inserted into the deep loading groove by a predetermined depth; And a blade stopper installed on the front surface of the insertion body and including an engagement body which is hooked on the front surface of the first cutting body.

Other aspects, features, and advantages will become apparent from the following drawings, claims, and detailed description of the invention.

According to the embodiment of the present invention, there is an effect that the insulator of the end portion of the cable can be divided into four parts using the circular blade and the double rectilinear blade so that the whole insulator can be removed.

In addition, there is also an effect that the cutting quality is improved by solving the internal shaking phenomenon of the removed cloth by maximizing the insulator loading hole space and using a space (gap) between the replaceable circular blade and the straight blade.

In addition, it is possible to securely cut the insulation cutoff by preventing the hand stitches through the safety cover, to easily adjust the length of the cable end to be cut through the blade stopper, and to secure the straightness when cutting the insulated cutout through the side guide. Thereby preventing the damage of the piston rod due to the blade jaw and improving the cutting quality.

FIGS. 1 to 3 are respectively a front view, a rear view, and a side view of a cable insulator removal apparatus according to an embodiment of the present invention;
4 is a view showing a state where a cable insulator is removed using an insulator removing portion,
5 is a perspective view of a linear cutter,
6 is a front view of a pair of straight cutters,
7 is a front view and a side view of the circular cutter,
8 is a view showing a state in which the insulator removal portion is mounted on the head portion,
9 and 10 show additional components and assembly diagrams mounted on the head portion with the insulator removal portion,
11 shows a cable stopper and its mounting.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. And the terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIGS. 1 to 3 are views showing front, rear, and side views, respectively, of a cable insulator removing apparatus according to an embodiment of the present invention. FIG. 4 is a view showing a state in which a cable insulator is removed using an insulator removing unit, 7 is a front view and a side view of the circular cutter, FIG. 8 is a view showing a state in which the insulator removal portion is mounted on the head portion, and FIG. 7 is a front view and a side view of the circular cutter, Figs. 9 and 10 show additional components and an assembly diagram to be mounted on a head portion equipped with an insulator removing portion, and Fig. 11 is a view showing a blade stopper and a mounting state.

The cable insulator removal device according to an embodiment of the present invention is characterized in that the insulator of the end portion of the cable can be divided and removed in a compression manner by using a circular blade (or semicircular blade) and a double straight blade.

1 to 11 show a cable insulator removing device 1, a head portion 10, a body portion 20, an insulator removing portion 30, a cable 91, a cable insulator 93, a cable core portion 92, The cutter portion 94, the first cutting body 110a, the second cutting body 110b, the first linear cutter 120a, the first circular cutter 130a, the straight blades 121a and 122a, The mounting groove 126a, the fitting groove 127a, the vertical surface 135a, the conical inclined surface 136a, the cutting inclined surfaces 137a and 137b, the receiving portion 12, The groove 14a and 14b, the guide groove 16, the guide plate 60, the safety cover 70, the bellows 72, the bellows cover 74, the fixing pin 80 and the blade stopper 40 are shown have.

1 to 3, the cable insulator removing apparatus 1 according to the present embodiment mainly includes a head portion 10, a body portion 20, and an insulator removing portion 30.

The accommodating portion 12 of the head portion 10 is provided with an insulator removing portion 30. The insulator removing portion 30 moves limitedly (upward and downward in the figure) in the accommodating portion 12 by a force supplied from the body portion 20, and separates and removes the insulator of the cable end portion by a compression method.

The body part 20 is a part for grasping the operator. (Not shown) may be provided inside the body portion 20 to supply a force (a strong force) for the operation of the insulator removal unit 30. [

The force providing portion may be made of a cylinder type, and the piston rod driving method of the cylinder may be a power supply method using electricity or a hydraulic method using oil pressure. In the case of the power supply system, a battery system for improving portability or a wired power supply system for stable power supply can be applied. In the case of the hydraulic system, a hydraulic line for supplying the hydraulic pressure may be separately connected.

Referring to Fig. 8, there are shown a piston rod (elevating portion 52) raised and lowered by force exerting and a mount 50 mounted on the upper portion of the piston rod.

A head portion 10 is provided at an upper portion of the body portion 20. The head portion 10 may be provided with a receiving portion 12 on which the insulator removing portion 30 is mounted. The accommodating portion 12 has an internal shape that is elongated in the longitudinal direction of the body portion 20 so that the insulator removing portion 30 can have a sufficient space for allowing the cable to enter and exit from the insulator in the release state Lt; / RTI >

The insulator removing unit 30 includes a first cutting body 110a and a second cutting body 110b.

The first cutting body 110a is installed so as to be movable up and down in the lower portion of the receiving portion 12. [ The second cutting body 110b is fixed to the upper portion of the receiving portion 12. [ The first cutting body 110a and the second cutting body 110b are disposed opposite to each other so that the blade portions can be engaged with each other.

The first cutting body 110a receives power from the body portion 20 and is coupled to the elevation portion 52 which is vertically moved from the lower portion of the head portion 10 (the lower portion of the accommodating portion 12). The elevating portion 52 may be a piston rod of a cylinder provided inside the body portion 20 of the main body. The piston rod can reciprocate in the longitudinal direction of the body portion 20, that is, in the up and down direction, depending on whether the power source or the hydraulic pressure is supplied, thereby allowing the first cutting body 110a to perform the elevating operation.

Here, a mount 50 for mounting the first cutting body 110a may be installed on the upper part of the elevating part 52. [ The mount 50 has a concave mounting groove formed on its upper surface, and the mounting groove may have a shape corresponding to the outer surface of the first cutting body 110a.

When the first cutting body 110a mounted on the mount 50 ascends to the highest position when the elevating and lowering portions 52 move up and down, the end insulator of the cable 91 interposed between the second cutting body 110b and the second cutting body 110b is divided into four . When the first cutting body 110a mounted on the mount 50 is lowered to the lowest position, the cable end for removing the insulator is sufficiently separated from the second cutting body 110b, Allow the removed cable core and cutouts to advance.

Hereinafter, the structure and function of the insulator removing unit 30 will be described in detail with reference to the related drawings.

4 to 7, the insulator removing unit 30 includes a first cutting body 110a and a second cutting body 110b having opposite structures.

The first cutting body 110a and the second cutting body 110b position the end of the cable 91 therebetween and then apply pressure in the vertical direction to divide the cable insulator 93 into four parts in the longitudinal direction of the cable, So that the cut portion 94 is removed from the cable 91. In this case,

The first cutting body 110a and the second cutting body 110b have the same structure. The first cutting body 110a will be described below.

In the present specification, it is assumed that the + Y axis direction is rearward, the -Y axis direction is front, the X axis direction is left-right direction, and the Z axis direction is vertical direction.

The first cutting body 110a includes a first linear cutter 120a and a first circular cutter 130a.

The first linear cutter 120a positions the end of the cable 91 with the second linear cutter 120b and presses the cable insulator 93 and the cable core 92 in the vertical direction (Z- In the horizontal direction (cable length direction).

The first linear cutter 120a is formed to have a length equal to or longer than the length of the insulator to be removed. When the length of the first linear cutter 120a is long (that is, when the length of the insulator to be removed is small), the length can be adjusted by using a blade stopper 40 to be described later.

In the inner surface (boundary surface) of the first linear cutter 120a that meets the second linear cutter 120b in the pressing process, three grooves 123a, 124a, and 125a Is formed.

The second linear cutter 120b also has the same structure as the first linear cutter 120a, and three grooves defined by a pair of straight blades are formed on the inner surface (boundary surface) thereof.

The three grooves 123a, 124a, 125a formed in the first linear cutter 120a and the three grooves formed in the second linear cutter 120b meet each other in the pressing process to form a cable core portion in which the left and right insulators are cut, , And an accommodating space for accommodating the insulated right insulator, respectively.

The pair of straight blades 121a and 122a may have a sloped surface whose inner surface has a vertical surface and whose outer surface has a predetermined sloped angle. The ends of the pair of straight blades 121a and 122a are placed on the interface between the first straight cutter 120a and the second straight cutter 120b so that a pair of straight cutters 120b And the end of the straight edge of.

The distance between the pair of straight blades 121a and 122a is substantially equal to the diameter of the cable core portion 92. [ Accordingly, as the pair of straight blades 121a and 122a are pressed in the vertical direction, the left and right boundary points where the cable insulator 93 and the cable core portion 92 meet are cut in the vertical direction.

A part of the core 92 in which the left and right insulators are partially removed by the pair of straight blades 121a and 122a can be partially loaded in the deep part mounting groove 123a placed between the pair of straight blades 121a and 122a. The deep loading grooves 123a may have a polygonal column shape in which the inner surfaces of the pair of straight blades 121a and 122a constitute side surfaces. Although the figure is basically shown as a quadrangular pole and the corner portion has a chamfered shape, this is only an embodiment.

Cutting mounting grooves 124a and 125a are formed on the outer sides of the pair of straight blades 121a and 122a, respectively. The cutting insert grooves 124a and 125a may be partially loaded with the left and right cut insulator cutouts in the cable 91. [ The cutting loading grooves 124a and 125a may have a columnar shape in which the outer surfaces of the pair of straight blades 121a and 122a constitute side surfaces.

The size of the cutting loading grooves 124a and 125a needs to be sufficient to accommodate at least 1/2 of the left and right cut insulator cutouts. This is because when the size of the cutting loading grooves 124a and 125a is small, the insulated cut portion after being cut is protruded outward due to insufficient space in the process of being accommodated in the loading groove, The head portion 10) may be damaged, so that such a problem is solved.

A first linear cutter 120a is formed at the center of the outer surface of the first linear cutter 120a to form a mounting groove 126a for allowing the receiving portion 12 of the head portion 10, .

Although the first linear cutter 120a and the second linear cutter 120b are in the form of a cylinder in the state in which the first linear cutter 120a and the second linear cutter 120b are engaged with each other by compression, this is merely an example, and a polygonal column- Of course.

The first circular cutter 130a is mounted at the rear end of the first linear cutter 120a. The first circular cutter 130a and the first linear cutter 120a can be fastened by bolts. The front side of the first circular cutter 130a is fastened to the rear side of the first linear cutter 120a when the end of the cable 91 is assumed to be forward and the first linear cutter 120a is viewed as the center I will explain.

The first circular cutter 130a and the second circular cutter 130b are placed at the starting point of the removal of the insulator among the ends of the cable 91 therebetween and then pressurized in the vertical direction to insulate the cable insulator 93 ) In the direction perpendicular to the central axis of the cable (91).

The first circular cutter 130a is provided with a semicircular blade 131a along a concave groove having a predetermined diameter. The diameter of the semicircular blade edge 131a is substantially equal to the diameter of the cable core portion 92.

When the first circular cutter 130a and the second circular cutter 130b are engaged with each other in the pressing process, the two semicircular blades 131a and 131b function as one circular blade. At this time, a circular hole 132 corresponding to the cable core portion 92 is formed, so that only the cable insulator 93 is cut and the cable core portion 92 is not damaged.

The semicircular blade 131a may have a conical slope 136a whose rear surface is a vertical surface 135a and whose front surface has a predetermined slope angle. The conical inclined surface 136a has a predetermined inclination angle so that the cable insulator 93 can easily enter when cutting the cable insulator 93 in the vertical direction.

In this case, the portions where the two semicircular blades 131a and 131b meet with each other, that is, both ends of the semicircular blades 131a and 131b have a predetermined thickness. This is because a high cutting load is applied to the half-circle blades 131a and 131b in the process of cutting the cable insulator 93, and it is necessary to have a structure in which the thickness becomes thicker from the end to the outside.

Therefore, in this embodiment, cut-off slopes 137a having a predetermined slope angle (for example, 25 degrees (?)) With respect to the rear slope (that is, the XZ plane) may be formed at both ends of the front surface of the semicircular blade 131a. The cutting inclined surface 137a also has a predetermined inclination with respect to the conical inclined surface 136a.

The cutting of the cable insulator 93 facilitates entry of the semicircular blade 131a in the process of being pressed in the vertical direction due to the presence of the cutting slope 137a, so that a high cutting quality can be secured even with a small pressing force.

When the first circular cutter 130a and the second circular cutter 130b meet, the angle between the two adjacent cutting slopes 137a and 137b may be 130 degrees ([deg.]), For example. This makes it possible to secure the best cutting quality with the minimum pressing force as the best entering angle at the time of cutting the insulator according to the material and thickness of the insulator.

The first circular cutter 130a is fitted into a first fitting groove 127a formed at the rear end of the first linear cutter 120a and the second circular cutter 130b is fitted into a second fitting groove formed at the rear end of the second linear cutter 120b And is fitted into the second fitting groove 127a. At this time, a gap exists between the first circular cutter 130a and the first linear cutter 120a, and between the second circular cutter 130b and the second linear cutter 120b. Through this gap, it is possible to prevent an uneven burr phenomenon in the cut surface and to prevent the cable insulator from being pinched in the inside of the straight cutter. That is, part of the insulator is removed in a state where the insulator is not cut through the gap, insulator pinched phenomenon does not occur, a clean cut surface is ensured, and the quality of the cut surface is excellent.

In order to prevent breakage of the blade due to the cutting load, it is necessary to increase the thickness from the end of the blade toward the outer side. It is possible to satisfy this condition through the cutting slopes 137a and 137b, Durability can be increased.

Also, it is possible to accommodate the volume of the insulator which is cut and pushed through the angle between the cutting slopes 137a and 137b, thereby maximizing the durability of the blade.

The insulator removing part 30 is provided with a first cutting body 110a and a second cutting body 110b mounted on the head part 10 and being engaged with each other by a pressing force in the vertical direction by the elevating means, The cable insulator 93 surrounding the cable core portion 92 is divided into four cutouts and removed.

In this case, the simultaneous pressing and cutting of the linear cutter and the circular cutter improves the removal quality of the insulator.

Further, in this embodiment, the circular cutter is provided in a detachable manner, and when the semicircular blade having a relatively low durability is broken, the life of the product can be prolonged through replacement.

Referring to FIG. 8, the receiving portion 12 is formed to be long in the vertical direction to guide the vertical movement of the first cutting body 110a. The first cutting body 110a can be raised and lowered in the vertical direction by the elevating part 52 and the mount 50. [

A guide groove 16 for vertically lifting and lowering the first cutting body 110a is formed on the front and / or rear surface of the accommodating portion 12, and a guide plate 60, Can be installed.

The guide plate 60 is fixed to the front surface and / or rear surface of the mount 50 on which the first cutting body 110a is mounted so that the first cutting body 110a is prevented from twisting when the first cutting body 110a is lifted or lowered. In addition, damage to the lifting means (e.g., damage to the piston) may occur due to the pushing of the first cutting body 110a during the pressing process. By ensuring the straightness through the guide groove 16 and the guide plate 60, It is possible to prevent damage.

A safety cover 70 may be provided on the front and / or rear surfaces of the receiving portion 12 to prevent hand stucking when the first cutting body 110a is returned (lowered) after the pressing operation.

The safety cover 70 for this includes a bellows 72 and a bellows cover 74. The bellows 72 has a structure folded many times. For example, the bellows 72 may have a two-stage or three-stage folded structure.

The upper end of the bellows 72 is fixed to the surface of the guide plate 60 and the lower end is fixed to the bellows cover 74 fixed to the lower end of the head portion 10.

When the guide plate 60 rises for pressing, the upper end of the bellows 72 also unfolds together to prevent the lower space of the accommodating portion 12 from being opened. Therefore, it is possible to prevent the operator's hand from entering the lower space of the receiving portion 12 and being stuck at the time of lowering the first cutting body 110a after the pressing.

In addition, when the guide plate 60 is lowered, the upper end of the bellows 72 is also lowered and folded together and placed outside the bellows cover 74.

Status check grooves 14a and 14b may be formed on the side surface of the head portion 10. The state of the cable cut by the straight cutter can be confirmed through the first state confirmation groove 14a formed in the front side of the side surface of the head part 10. [ In addition, it is possible to confirm the state of cutting the cable by the circular cutter through the second status confirming groove 14b formed in the rear of the side surface of the head part 10. [

Further, a mark (not shown) for guiding the cutting direction can be attached or printed on the side surface of the head portion 10. By guiding the cutting direction through the cover, it is possible to prevent the operator from mistaking the front and back in the process of cutting the end portion of the cable.

The guide plate 60 may be provided with a fixing pin 80. The fixing pin 80 is a pin for fixing the first cutting body 110a to the mount 50, and may have a ball guide structure.

Referring to Fig. 11, a blade stopper 40 is shown. The blade stopper (40) includes an insertion body (42) and an engagement body (44).

The insertion body 42 may have a cylindrical shape corresponding to the cable core portion and may have a predetermined length L2 smaller than the length L1 of the first cutting body 110a.

The insertion body 42 is provided with a locking body 44 on the front side thereof and the insertion body 42 and the locking body 44 can be integrally formed. The engaging body 44 is engaged with the front surface of the first cutting body 110a to prevent the insertion body 42 from being inserted into the deep loading groove 123a of the first cutting body 110a beyond a predetermined depth.

The end of the cable 91 to which the insulator is to be removed by the blade stopper 40 can be adjusted in the removal length. In addition, the blade stopper 40 allows the operator to precisely adjust the removal length.

By varying the length of the insertion body 42 in the case of the blade stopper 40, the removal length of the cable end can be variously adjusted.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

1: cable insulator removing device 10: head part
20: body part 30: insulator removal
40: Day stopper 50: Mount
60: guide plate 70: safety cover
80: fixing pin 110a: first cutting body
120a: first straight cutter 130a: first circular cutter
121a, 122a: straight blade 123a: deep loading groove
124a, 125a: Cutting loading groove 126a: Mounting groove
127a: Fitting groove 131a: Semicircle
132: Circular hole 135a: Straight surface
136a: Conical inclined surface 137a: Cutting inclined surface

Claims (8)

Body part;
A head unit installed at an upper portion of the body and having an empty accommodation portion;
And an insulator removing portion mounted in the accommodating portion to remove the cable insulator,
Wherein the insulator removing portion includes a first cutting body and a second cutting body having an interlocking structure,
Wherein the first cutting body and the second cutting body each have a straight cutter arranged such that a pair of straight blades are parallel to the longitudinal direction of the cable and spaced apart from each other corresponding to a diameter of the core of the cable; And a circular cutter mounted on the rear of the linear cutter and having a semicircular blade along a semicircular concave groove corresponding to the diameter of the core of the cable,
Wherein the first cutting body is mounted on a mount that moves up and down at a lower portion of the receiving portion,
The second cutting body is fixed to the upper portion of the receiving portion,
A guide plate fixedly installed on a side surface of the mount;
Further comprising a guide groove formed on a side surface of the head portion and guiding the guide plate up and down,
Further comprising a safety cover which prevents the opening of the receiving space formed in the lower space of the receiving unit which is generated or destroyed by the lifting operation of the mount,
The safety cover includes: a bellows cover fixed to a lower portion of the head portion; Wherein the upper end is coupled to the guide plate and the lower end is coupled to the bellows cover, the bellows having a plurality of folded structures. The method according to claim 1,
Wherein the semicircular blade has a rear surface of a vertical surface and a front surface of a conical slope having a predetermined inclination angle. delete delete The method according to claim 1,
Wherein the head portion further comprises a state confirmation groove formed on a side surface and capable of confirming a cable cutting state by at least one of the linear cutter and the circular cutter. The method according to claim 1,
In the linear cutter,
A deep loading groove disposed between the pair of straight blades, for loading the remaining portion of the cable remaining in the vertical direction by the pair of straight blades;
Wherein a pair of cutaway grooves are formed on the outer sides of the pair of straight blades and on which the insulated cut portions of the cables cut in the vertical direction are cut by the pair of straight blades. The method according to claim 6,
Wherein the pair of straight blades has a vertical plane on an inner side surface and an outer side surface has an inclined plane. The method according to claim 6,
An insertion body inserted into the deep loading groove by a predetermined depth; And a blade stopper installed on a front surface of the insertion body and including an engagement body that is hooked on a front surface of the first cutting body.

Images