JP3064207B2 - Cable sheath layer stripping tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable coating layer stripping tool for cutting and removing each coating layer stepwise from a cable having multiple coating layers.

[0002]

2. Description of the Related Art Electric wires, cables, and the like have a function in which the outer periphery of a conductor is covered with a plurality of coating layers such as an insulating layer and a sheath. Therefore, when connecting these cables to each other or connecting the cables to other devices, it is necessary to cut and remove each coating layer in a stepwise manner. 2. Description of the Related Art Conventionally, electric cutting knives and cutter knives that do not require a driving source have been widely used for cutting and removing work of a coating layer performed at a construction site. However, from the viewpoint of speeding up work and making skillless, development of a stepping tool for a coating layer using a driving source has been desired.

[0003] Therefore, as shown in Fig. 8, a cable coating layer cutting tool of this type has been developed (for example, Japanese Utility Model Laid-Open No. 2-142912, Japanese Patent Laid-Open No. 4-112608). As shown in the figure, the coating layer cutting tool a includes a cylindrical electric wire guide b connected to a rotating shaft of a rotary electric tool or the like,
A cutting blade d attached to a window c opened on a side surface of the cylindrical electric wire guide b. After inserting the cable e into the cylindrical electric wire guide b, the cylindrical electric wire guide b is rotated by a rotary electric tool. The coating layer f of the cable e is spirally cut and removed by the cutting blade d to expose the conductor g.

[0004]

However, in the conventional cable coating layer cutting tool a, the tip h of the blade portion of the cutting blade d is located between the conductor g of the cable e and the coating layer f. In addition, there is a fatal problem that the conductor g is easily damaged by the cutting blade d.

Normally, the difference (gap) between the inner diameter of the cylindrical wire guide b and the outer diameter of the cable coating layer f is set as small as possible from the viewpoint of preventing damage to the conductor g. The cylindrical electric wire guide b does not rotate. On the other hand, industrially mass-produced wires and cables e
Is manufactured by each manufacturer with its own manufacturing tolerance,
The outer diameter of the cable coating layer f may vary, and the gap may increase. In this case, since the cable e in the cylindrical electric wire guide b moves within the range of the gap, it is inevitable that the cutting blade d damages the conductor g.

[0006] In the electric wire or cable e, the conductor g and the coating layer f have many sizes (diameters), and the length of the coating layer f to be cut in the axial direction differs depending on the application place. For this purpose, it is necessary to prepare a cylindrical electric wire guide b with a cutting blade d for each size and carry them all to the work site. That is, there is a problem of irrationality of equipment preparation and high cost. Further, since the cutting blade d to be used has a special shape, there are problems in mass productivity and manufacturing cost.

Further, in this apparatus, only a single coating layer f is peeled off, and a cable having multiple coating layers f cannot be cut and removed in a stepwise manner.

SUMMARY OF THE INVENTION An object of the present invention, which has been made in consideration of the above circumstances, is to provide a cable having multiple coating layers without damaging the coating layer below the coating layer to be cut without damaging the coating layers. An object of the present invention is to provide a tool for stripping a cable coating layer that can be cut and removed stepwise.

[0009]

In order to achieve the above object, the present invention is configured as follows.

In a tool for cutting and removing a plurality of coating layers of a cable in a stepwise manner, a window is opened on a side surface of a cylindrical cable guide having one end connected to a rotating shaft and the cable inserted from the other end. At the window, each cutting blade extending inward in the radial direction according to the plurality of coating layers of the cable inserted into the cable guide is attached in a stepwise manner, and each cutting blade is connected to the cable by a blade. The blades are arranged obliquely with respect to the cable insertion direction so as to be located on the front side in the rotation direction of the guide, and each blade is formed such that the front side in the rotation direction of the cable guide is flat and the rear side is inclined, and each blade is the distal end portion of the part, cable
In the cross section of the bull, each blade portion is disposed apart from the lower layer in a region surrounded by the horizontal tangent line, the vertical tangent line, and the lower layer outer periphery of the outer layer of the coating layer below the coating layer to be cut, respectively.
Between the cable guide and the rotating shaft.
Removable attachment of body-shaped attachment
The stopper inside the attachment in the axial direction.
And the stopper is attached to the attachment.
A large diameter portion that slides freely in the axial direction of the inside of the
Projecting from the part toward the cable guide side,
The cable that has been cut through the coating layer and
The tip of the core wire of the bull
Fix this to the stopper at any slide position.
A fixing means is provided, and on the outer surface of the attachment,
A scale is provided for displaying the slide amount of the stopper .

[0011]

[0012]

[0013]

[0014]

According to this structure, when the cable is inserted into the cylindrical cable guide which is driven to rotate by the rotating shaft,
Each cutting blade attached to the window on the side surface of the cable guide and extending radially inward in a stepwise manner spirally cuts each coating layer while rotating the outer periphery of the cable. Thereby, each coating layer of the cable is cut and removed, and is discharged from the window, and the coating layer of the cable is peeled off in a stepwise manner.

More specifically, since each cutting blade is arranged to be inclined with respect to the cable insertion direction, the cutting blade starts cutting in the direction of the vector sum of the cable insertion force and the cable guide rotation force. Here, in each cutting blade, since the tip of the blade is separated from the outer periphery of the coating layer below the coating layer to be cut, the coating layer (cutting) between the tip of the blade and the outer periphery of the lower layer is cut. It seems that the lowermost part of the covering layer to be separated) cannot be separated from the lower layer.

However, when the cutting blade rotates integrally with the cable guide, a remarkable frictional force is generated between the tip of the blade portion of the cutting blade on the rotating side and the coating layer of the cable on the fixed side. The lowermost layer of the coating layer to be cut is sheared by the shearing force of the force. The cut coating layer is pushed upward along the plate-shaped portion on the front side in the rotation direction of the cutting blade, and is discharged from the window.

As described above, since the tip of the blade portion of each cutting blade is arranged away from the lower coating layer of the coating layer to be cut and is sheared by the rotational force of the cutting blade, the lower coating layer is damaged. Without cutting, only the coating layer to be cut is cut off, and the coating layer of the cable is peeled off in a stepwise manner.

Further, between the cable guide and the rotating shaft,
By attaching the attachment formed in a cylindrical shape, the core wire of the cable having the coating layer cut and removed as described above and penetrating the cable guide has its distal end face contacting the small diameter portion of the stopper housed inside the attachment. contact,
Further insertion of the cable is prevented. Therefore, when the core wire of the cable comes into contact with the stopper, the cutting and removing of the coating layer is completed.

Therefore, the stopper is slid in the axial direction based on the scale displayed on the outer surface of the attachment, and is fixed at a desired position by the fixing means, so that the length of the coating layer to be cut and removed in the cable axial direction is reduced. Can be adjusted.

[0020]

[0021]

[0022]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 7, a cable-coating-layer stepping-off tool 1 according to this embodiment has a cylindrical attachment 2 detachably connected to a rotating shaft of an electric rotating tool or the like, and is detachably attached to the attachment 2. And a cutting blade 5 attached to a window 4 opened on the side surface of the cable guide 3.

Then, the drive source mounting portion 6 of the attachment 2 is fitted to the chuck of the rotating shaft of the electric rotary tool (not shown), and the cable guide 3 is rotated through the attachment 2 so that the opening at one end of the cable guide 3 is opened. Of the cable 8 inserted from the inserted cable insertion port 7
The first and second cutting blades 5a and 5b, which rotate integrally with the cable guide 3, respectively, cut the second coating layers 9a and 9b in a spiral shape, and cut and remove them from the core wire 10, respectively.

That is, the tool 1 for stripping a cable coating layer according to the present embodiment comprises a core wire 10, a second coating layer 9b coated on the outer circumference, and a first coating layer 9a coated on the outer circumference.
And the first and second covering layers 9a and 9b are applied to the first and second cutting blades 5a and 5b.
The cable 8 is cut and removed by 5b, and the cable 8 is stripped as shown in FIG.

First, the attachment 2 shown in FIG.
This will be described with reference to FIG. The attachment 2 is formed in a cylindrical shape, and has a mounting portion 11 for mounting the cable guide 3 at one end thereof, and a connecting shaft for connecting a rotary shaft of a driving source such as a driver drill to the other end. Drive source mounting part 6
Are formed. A stopper 12 is slidably accommodated inside the attachment 2. The stopper 12 determines the axial cutting length of the second coating layer 9b (that is, the coating layer stripping length of the core wire 10) as shown in FIG.

The stopper 12 has a large diameter portion 13 and a small diameter portion 1.
4, a display unit 15, and fixing means 16. The large diameter portion 13 is formed to have a slightly smaller diameter than the inner diameter of the attachment 2, and slides freely in the attachment 2. The small diameter section 14 is connected to the cable
Even when the core wire insertion port 17 of the cable guide 3 shown in FIG. 7 is smaller than the large-diameter portion 13, the stopper 12 does not catch on the core wire insertion port 17 and has a short dimension. It is intended to be able to move to the area.

Assuming that the stopper 12 is only the large-diameter portion 13, when the stopper 12 is moved to a region having a short dimension (rightward in the figure), the large-diameter portion 13
, And it may not be possible to reduce the axial cutting dimension of the coating layer 9b. That is,
By providing the small-diameter portion 14 concentrically following the large-diameter portion 13 as in the present embodiment, a wide cut size can be obtained without increasing the size of the attachment 2 and the cable guide 3. Although the cable guide 3 will be described later, various sizes of the cable guide 3 are detachable, and some have a core wire insertion port 17 smaller than that shown in FIG.

As shown in FIG. 6, a long hole 18 is formed in the side surface of the attachment 2 in the longitudinal direction. The display portion 15 provided integrally with the stopper 12 is engaged with the elongated hole 18 and is guided. Slot 1
The outer surface of the attachment 2 along 8
Is provided with a scale 19 for displaying the slide amount.
Note that the scales 19 may be provided on both sides of the elongated hole 18.
According to this configuration, the slide position of the stopper 12 can be grasped by the display unit 15 and the scale 19.

The stopper 12 is fixed at an arbitrary sliding position by the fixing means 16. The fixing means 16 includes a screw hole 16a formed in the large diameter portion 13 and a screw hole 16a.
a and a screw 16b which is screwed into the elongated hole 18 by passing through the same. According to this configuration, by tightening the screw 16b into the screw hole 16a, the head of the screw 16b is pressed against the edge of the elongated hole 18, and the stopper 12 is fixed at an arbitrary sliding position. Note that, instead of the screw 16b, a butterfly bolt or the like that can be tightened by hand may be used.

The mounting portion 11 formed at one end of the attachment 2 is constituted by a concave portion 20 having a polygonal cross section. In this embodiment, the recess 20 is formed in a polygonal cross section. This is because the fitting portion 21 of the cable guide 3 inserted into the concave portion 20 is a convex portion 22 having a polygonal cross section as shown in FIG.

At least one surface of the convex portion 22 of the cable guide 3 is formed with an engagement groove 23 for preventing pull-out, and one surface of the concave portion 20 of the attachment 2 facing the engagement groove 23 is provided with a spring. There is provided a ball-shaped pull-out preventing member 25 which is pressed against and engaged with the engagement groove 23 by urging means such as 24.

The drive source mounting portion 6 formed at the other end of the attachment 2 is formed in a columnar or polygonal shape. This is for fitting to a chuck (not shown) provided on a rotating shaft of an electric rotating tool such as a driver drill. Further, it is preferable to use a hard material such as iron or stainless steel for the drive source mounting portion 6 from the viewpoint of preventing abrasion.

The rotation drive source of the attachment 2 is not limited to the electric rotary tool, but may be a tool driven by hydraulic pressure or air. In consideration of use in a narrow work site, a battery-type drill is preferable. Since drills of this type are commercially available in small and light weights with various performances, suitable drills may be selected and used. In particular, a driver drill is suitable.

As described above, the attachment 2 has a function of adjusting the cutting length of the second coating layer 9b in the axial direction (that is, the length of the coating layer peeling off the core wire 10) and a function of cutting the rotational force of the electric rotary tool. It has a function of transmitting to the cable guide 3 with the blade 5.

Since the attachment 2 has a relatively simple shape and is easy to process, a general metal material (iron, aluminum, titanium, copper alloy or the like) or engineering plastic (nylon or the like) is used. It is manufactured by machining and casting.

Next, the cable guide 3 will be described with reference to FIG. As shown, the cable guide 3
One end has a fitting portion 21 (convex portion 22) for connecting the attachment 2 described above, and the other end has a cable insertion port 7 into which the cable 8 is inserted. The cable insertion port 7 communicates with a core wire insertion port 17 having a smaller diameter than this, and a continuous hole is formed in the cable guide 3 in the cable guide 3 along the axial direction around the axis. I have.

A window 4 is opened on the side of the cable guide 3 so as to communicate with the cable insertion port 7 on the inside thereof, and a cutting blade 5 is attached to the window 4. The cutting blade 5 is composed of first and second cutting blades 5a and 5b. The first and second coating layers 9a and 9b of the cable 8 inserted from the cable insertion port 7 are respectively connected to the core wire 1.
It cuts and removes stepwise from 0.

The inside diameter of the cable insertion port 7 is formed slightly larger than the outside diameter of the cable 8 inserted therein. That is, when the cable 8 is inserted into the cable guide 3 and the cable guide 3 is rotated, a margin is provided such that friction does not occur between the inner peripheral surface of the cable insertion port 7 and the outer peripheral surface of the cable 8. Have been. The smaller the allowance is, the more the cable 8 and the cable insertion opening 7 are fitted to each other. Therefore, the risk of the cutting blades 5 a and 5 b damaging the second coating layer 9 b and the core wire 10 when cutting the coating layer 9 is reduced.

However, since the cables 8 are industrially mass-produced by many manufacturers and employ different manufacturing tolerances for each manufacturer, the cables 8 must be inserted into the cable guide 3 with too small a margin. A situation where insertion into the mouth 7 cannot be performed occurs. On the other hand, if the tolerance is set too large, the cutting blades 5a and 5b fluctuate within the tolerance when cutting the coating layers 9a and 9b.
b is likely to damage the second coating layer 9b and the core wire 10.

Therefore, even if the cutting blades 5a and 5b fluctuate within the range of the margin when cutting the coating layers 9a and 6b, the cutting blades 5a and 5b are connected to the second coating layer 9b and the core wire 10b. It is necessary to set the maximum size so that there is no risk of damaging the device. In the present embodiment, a large margin is set between the inner peripheral surface of the cable insertion port 7 and the outer peripheral surface of the cable 8 by configuring the cutting blades 5a and 5b as described below. Is possible.

The cable guide 3 is provided with each coating layer 9.
A plurality of types are prepared for each of the cables 8 having different sizes a, 9b and the core wire 10. Therefore, the core wire 10 and the coating layer 9 to be applied are formed on the outer surface of the cable guide 3.
If the sizes of a and 9b are displayed, a step is formed on the outer surface, or a different material or coloring is applied, it is convenient to select a voltage class and a conductor (core wire) size to be applied.

Since the cable guide 3 has a relatively simple shape and is easy to process, a general metal material (iron, aluminum, titanium, copper alloy or the like) or engineering plastic (nylon or the like) is used. It is manufactured by machining and casting.

Next, the cutting blade 5 will be described with reference to FIGS. 2, 5 and 7. Window 4 of cable guide 3
The first and second cutting blades 5a and 5b attached to the cable 8 are stepped radially inward in accordance with the first and second coating layers 9a and 9b of the cable 8 inserted into the cable guide 3, respectively. It is extended and attached. Specifically, the first and second cutting blades 5a and 5b
Is formed integrally with the substantially rectangular blade main body 27 attached by the above.

The first cutting blade 5a is located forward in the cable insertion direction, and peels off the first coating layer 9a of the cable 8, and the second cutting blade 5b is located rearward in the cable insertion direction. 8 for peeling off the second coating layer 9b. The extension length of the first cutting blade 5a inward in the radial direction is
It is shorter than the extension length of the second cutting blade 5b. Therefore, the cable 8 inserted into the cable guide 3 firstly receives the first cutting blade 5
a, the first coating layer 9a of the first step is peeled off, and then the second coating layer 9b of the second step is cut by the second cutting blade 5b.
Is peeled.

As shown in FIG. 1 (b), the tip portion 29 a of the blade portion 28 a of the first cutting blade 5 a is located in the cross section of the cable 8.
Te, horizontal tangent line H ₁ in the vertical direction tangent V ₁ and region Z ₁ surrounded by the second tripartite coating layer outer periphery L ₁ of the outer periphery of the second coating layer 9b, are arranged. Similarly, the distal end portion 29b of the blade portion 28b of the second cutting blade 5b is horizontally tangent between H ₂ and the vertical direction tangent V ₂ core outer circumference of the outer periphery of the core wire 10 of the cable 8 L
In the region Z _2, surrounded by ₂ tripartite, are arranged.

Thus, the blade portion 28a of the first cutting blade 5a
With distance x _1, it can be increased in the front end portion 29a of the the outer circumference of the second covering layer 9b, so that the distance x ₂ between the outer periphery of the distal end portion 29b and the core wire 10 of the blade portion 28b of the second cutting blade 5b, can be increased The inner peripheral surface of the cable insertion port 7 and the cable 8
A large margin can be set between the outer peripheral surface and the outer peripheral surface. If the inner diameter of the core wire insertion hole 17 is set to be equal to or larger than the outer diameter of the maximum core wire 10 among the various cables 8, it can be used commonly for all kinds of cables 8, and cost reduction and improvement of workability are promoted. it can.

1 and 5, the cutting blades 5a and 5b are positioned with respect to the cable insertion direction S such that the blade portions 28a and 28b are located in front of the cable guide 3 in the rotation direction R. Window 4
Attached to. Mounting angle θ of cutting blades 5a, 5b
Varies depending on the outer diameters of the coating layers 9a and 9b and the core wire 10 to be cut, but as shown in FIG. 1, the cutting blades 5a and 5b
When the rear end 32 is overlapped with the center line 33 of the cable 8, the tip portions 29 of the blade portions 28 a and 28 b of the respective cutting blades 5 a and 5 b
a, 29b are vertical tangents V ₁ , V ₂ and horizontal tangent H
An angle located near the midpoint of the respective intersections with ₁ and H ₂ is preferred. In FIG. 1, illustration of the cable guide 3 is omitted.

The blade portions 28a, 28b of the respective cutting blades 5a, 5b
Is a front side surface 34 of the cable guide 3 in the rotation direction R.
Is formed in a flat plate shape, and the other rear side surface 35 is formed in an inclined shape. The details are shown in FIG. As shown in the figure, the first and second cutting blades 5a and 5b are formed integrally with a blade main body 27 formed of a substantially rectangular flat plate. Each blade portion 28a, 28b of the first and second cutting blades 5a, 5b is formed of a long inclined surface 36a, 36b and a short inclined surface 37a, 37b, respectively. These blade portions 28a and 28b substantially cut and remove the coating layers 9a and 9b. The second cutting blade 5b has a tapered portion 38 connected to the short inclined surface 37b. Tapered part 38
May be a plurality of straight lines, or may be provided with an inclined surface (blade).

The blade portions 28 of the first and second cutting blades 5a, 5b
As shown in FIG. 1, the tip portions 29a and 29b of the blades 28a and 28b
The horizontal tangents H ₁ , H ₂ and the vertical tangents V ₁ , V _{2 on} the outer periphery of the coating layer 9 b or the core wire 10 below the coating layer to be cut
₂ and the areas Z ₁ and Z surrounded by the lower layer outer circumferences L ₁ and L _2.
2 , a predetermined distance x from the lower layer 9b or the core wire 10, respectively.
_1, x ₂ apart are arranged.

Therefore, the blade portion 28 of each of the cutting blades 5a and 5b.
The coating layers 9a, 9b at the portions radially inward of the tip portions 29a, 29b of the a, 28b (the portions at the tip distance x) are not cut by the cutting blades 5a, 5b, but as shown in FIG. It is sheared by the rotational force (friction) generated by the rotation of the cutting blade 5. That is, each cutting blade 5a, 5
The coating layers 9a and 9b in the portions radially outward from the tip portions 29a and 29b of the blade portions 28a and 28b of FIG.
b, one side 34 of the cutting blade 5 (planar)
And is discharged from the window part 4 at this time, and at this time, the coating layers 9a and 9b at the portions of the distances x ₁ and x ₂ are
Is also pulled upward and is sheared by the tensile force.

The tip distances x ₁ and x ₂ are determined by the cutting blades 5a and 5b.
It is preferable that the rotation speed is 100 rpm or more and the distances x ₁ , x ₂ are 2.5 mm or less, though it depends on the rotation speed. Because,
This is because when the rotation speed is reduced, the frictional force is reduced and the shearing cannot be performed, and when the distance x is increased, the shearing area increases and the shearing cannot be performed. The rotation speed of the cutting blade is low (500 rpm) for the driver drill as the drive source because of the safety of work and large cutting torque required.
pm or less) is preferred.

The cutting blades 5a and 5b are manufactured by machining a steel material into the shape of the blade main body 27, quenching, and sharpening the blade. The blade body has holes 3 through which screws and the like are inserted.
9 are formed. The blade main body 27 is screwed into the window portion 4 by inserting a screw 26 or the like into the hole 39,
It is fixed to the window 4 of the cable guide 3. The hole 39 may be a single hole or a plurality of holes, and may be formed in a long hole shape so that the fixing position of the cutting blade 5 can be finely adjusted.

The operation of this embodiment having the above configuration will be described.

First, the drive source mounting portion 6 of the attachment 2 shown in FIG. 6 is fixed to a chuck (not shown) provided on a rotating shaft such as a driver drill. Then, as shown in FIG. 7, the protrusions 2 of the cable guide 3 matching the size of the cable 8 to be cut are formed in the recesses 20 of the attachment 2.
2 is attached.

Then, since the convex portion 22 and the concave portion 20 are formed in a polygonal cross section, the rotational force of the attachment 2 connected to the rotary shaft such as a driver drill is transmitted to the cable guide 3 without slipping. Is done. Also,
The pull-out preventing member 25 provided on the concave portion 20 side is pressed into and engaged with the engaging groove 23 formed on the convex portion 22 side by a biasing means such as a spring 24 so that the attachment 2 is connected to the cable guide. 3 is prevented from being pulled out.

Thereafter, in order to obtain a required cutting dimension of the second coating layer 9b (that is, the length of the coating layer stripped off of the core wire 10), the screw 16b is loosened and the stopper 12 is slid and moved to be provided integrally with the stopper 12. The displayed display 15 is inserted into the slot 18
, And a necessary cutting dimension is set based on a scale 19 provided along the elongated hole 18. And
The stopper 12 is fixed by tightening the screw 16b. Thus, preparation for cutting is completed.

Next, the cable 8 is inserted into the cable insertion opening 7 of the cable guide 3 by the first coating layer 9a.
Insert the screwdriver drill until it comes into contact with a, and switch on the driver drill with a slight force applied. Then, the rotation of the driver drill is transmitted to the cable guide 3 via the attachment 2, and the first cutting blade 5 a fixed to the cable guide 3 rotates on the outer periphery of the cable 8 and the first coating layer 9.
a is spirally cut so that the first coating layer 9a is
b is spirally cut from b and discharged from the window 4.

More specifically, since the first cutting blade 5a is arranged at an angle θ to the cable insertion direction S as shown in FIG. 1, the insertion direction S of the cable 8 and the rotation of the cable guide 3 are changed. The cutting is started in the direction T of the vector sum with the direction R. Here, the first cutting blade 5a, since the leading end portion 29a of the blade portion 28a are separated by a distance x ₁ from the second covering layer 9b, the blade tip portion 29a and the second covering layer 9b
It seems that the lowermost part of the first coating layer 9a between the outer circumference and the outer circumference cannot be separated from the second coating layer 9b.

[0060] However, the first coating layer 9a of the blade portion 28a tip 29a from the radially inner portion of the first cutting blade 5a (portion of the tip distance x ₁₎ is cut by the first cutting blade 5a Instead, it is sheared by the rotational force (friction) generated by the rotation of the first cutting blade 5a. That is, the first coating layer 9a at a portion radially outward from the tip portion 29a of the blade portion 28a of the first cutting blade 5a is cut by the first cutting blade 5a to form a flat one side surface 34 of the cutting blade 5. is discharged from the window portion 4 is pushed up along the first covering layer 9 parts of the distance x ₁ along with the discharge of the discharge kudzu
The lowermost layer of a is also pulled upward and is sheared by the tensile force.

[0061] Thus, with the first cutting blade 5a away from the second covering layer 9b distance x ₁ arranged to cut the upper and middle portion of the first covering layer 9a by the first cutting edge 5a, the Since the lowermost layer of the first coating layer 9a is sheared by the rotational force of the first cutting blade 5a, only the first coating layer 9a is cut in a spiral shape without damaging the second coating layer 9b at all.

The cable 8 from which the second coating layer 9b has been stripped is then stripped of the second coating layer 9b by the second cutting blade 5b as shown in FIG. Is exposed. Such a second cutting blade 5b
The second coating layer 9b is also stripped off by shearing in the same manner as described above, so that no damage is caused on the core wire 10.

As shown in FIG. 7, the core wire 10 whose first and second coating layers 9 a and 9 b have been cut and penetrated the cable guide 3 has a distal end surface 41 of a stopper 12 housed inside the attachment 2. The first and second coating layers 9a and 9b are continuously cut in a spiral shape while the process proceeds until the small-diameter portion 14 is contacted. When the distal end surface 41 of the core wire 10 abuts on the small diameter portion 14 of the stopper 12, further insertion of the cable 8 is prevented, so that the cutting blades 5a, 5b rotate on the same circumference of the coating layers 9a, 9b, From the spiral cutting to the circumferential cutting, the coating layers 9a and 9b are
And is discharged from the window 4 and dropped. At this point, the driver drill is turned off to stop the rotation of the cable guide 3 and the cable 8 is connected to the cable guide 3.
And the work is completed.

Further, the covering layers 9 of different core wire sizes 10
When cutting a and 9b, a cable guide 3 with a cutting blade 5 dedicated to the core wire size may be selected and attached to the attachment 2. When a long cut is required, an attachment 2 having a dimension adjusting mechanism corresponding to the cut may be used. That is, a plurality of types of the cable guides 3 and the attachments 2 are prepared in advance according to the types of the cables 8 to be peeled off at the site.

Here, by sharing the attachment 2 and the cable guide 3 with the cutting blade 5 with each other, a tool that can peel off various coating layers (9a, 9b, etc.) at low cost can be obtained. It should be noted that the drive source and the cutting blade are integrated,
Alternatively, it is conceivable that the attachment and the cutting blade are integrated.However, the former requires the drive source to match the maximum cable to be applied, and the latter requires replacement of the attachment and the cutting blade when changing the cutting dimensions. There is an irrationality that must be made.

The cable guide 3 with the cutting blade 5 is
Since it is only for the size of the core wire to be cut (or only for the thickness of the coating layer), it is possible to quickly and easily connect various cables 8 by selecting a cable that is suitable for the cable 8 to be cut and attaching it to the attachment 2. Can respond. That is, in a narrow work site, it is not necessary to adjust the cutting edge dimensions and the like according to the core wire size or the coating layer thickness.

When the cable guide with a pencil cutting blade provided with a pencil cutting blade for performing the pencil-ring of the coating layers 9a and 9b is attached to the attachment instead of the cable guide 3 with the cutting blade 5, the cut after cutting is performed. Pencilling of the coating layers 9a and 9b can be performed.

[0068]

In summary, the cable covering layer stepping-off tool according to the present invention can exert the following excellent effects.

(1) The upper layer and the middle layer of the coating layer to be cut are cut by each cutting blade, and the lowermost layer of the coating layer to be cut is sheared by the rotational force of each cutting blade. The plurality of coating layers can be cut and removed stepwise without damaging the underlying coating layer.

(2) By appropriately moving the stopper in the attachment and fixing it with the fixing means, the length of the coating layer to be cut and removed in the cable axis direction can be adjusted.
In addition, since the cable coating layer stepping tool is composed of a drive source, an attachment, and a cable guide with a cutting blade, the optimal drive source, attachment and cable guide with a cutting blade for the coating layer to be cut can be selected. Components can be shared with each other. Therefore, it is a low-cost and small tool.

[0071]

[0072]

[Brief description of the drawings]

FIG. 1 is a view showing an engagement between a cutting blade of a cable coating layer stepping-off tool and a cable according to an embodiment of the present invention;
(a) is a plan view, (b) is an AA line arrow view of (a).

FIGS. 2A and 2B are views showing a cutting blade of the cable coating layer stepping-off tool, wherein FIG. 2A is a side view, and FIG. 2B is a view taken along the line BB of FIG.

FIG. 3 is a view showing a state in which a first coating layer of a cable is cut by the cutting blade.

FIG. 4 is a view showing a cable in which first and second coating layers are stripped by the cable coating layer stepping tool.

5A and 5B are diagrams showing a cable guide of the tool for stripping a cable covering layer step, wherein FIG. 5A is a plan view, and FIG.
It is a line sectional view.

FIG. 6 is a view showing an attachment of the tool for stripping the cable covering layer step, wherein (a) is a plan view and (b) is a DD of (a).
It is a line sectional view.

FIG. 7 is a side sectional view of a cable coating layer stepping-off tool including the cable guide and the attachment.

FIG. 8 is a cross-sectional view showing a state in which a cable coating layer is cut and removed by a conventional cable coating layer cutting tool.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cable coating layer stepping-off tool 2 Attachment 3 Cable guide 4 Window 5a 1st cutting blade 5b 2nd cutting blade 8 Cable 9a 1st coating layer 9b 2nd coating layer 10 Core wire 28a Blade 28b Blade 29a Tip 29b Tip Part 34 One side of cutting blade (front side) 35 The other side of cutting blade (rear side) R Rotation direction S Cable insertion direction θ Mounting angle of cutting blade H ₁ , H ₂ Horizontal tangent V ₁ , V ₂ Vertical tangent L ₁ , L ₂ outer circumference Z ₁ , Z ₂ area x ₁ , X ₂ distance

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Koseki 4-1-1, Hiroka, Miyagino-ku, Sendai, Miyagi Prefecture Inside Yutec Co., Ltd. (72) Takenobu Izumiya 4-1-1, Hiroka, Miyagino-ku, Sendai, Miyagi Prefecture No. Yurtec Co., Ltd. (56) References JP-A-1-91609 (JP, A) JP-A-2-246714 (JP, A) JP-A 7-16520 (JP, U) JP-A 53-32981 ( JP, U) Hikaru 2-17910 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 1/12

Claims (1)

(57) [Claims] 1. A tool for cutting and removing a plurality of coating layers of a cable in a stepwise manner, wherein one end is connected to a rotating shaft and a window is opened on a side surface of a cylindrical cable guide into which the cable is inserted from the other end. On the window portion, each cutting blade extending radially inward in accordance with the plurality of coating layers of the cable inserted into the cable guide is attached in a stepwise manner, and each cutting blade is attached to the blade portion. Are arranged obliquely with respect to the cable insertion direction so as to be located on the rotation direction front side of the cable guide, and each blade portion is formed such that the front side in the rotation direction of the cable guide is flat and the rear side is inclined, and the tips of the blade portion, Ke
In the cross section of the cable, in the region surrounded by the horizontal tangent, the vertical tangent, and the lower outer periphery of the outer periphery of the coating layer below the coating layer to be cut by each blade portion, and arranged separately from the lower layer , Between the above cable guide and the rotating shaft,
Removable attachment of cylindrical attachment
The stopper inside the attachment in the axial direction.
And the stopper is attached to the attachment.
A large diameter portion that slides freely in the axial direction of the inside of the
Projecting from the part toward the cable guide side,
The cable that has been cut through the coating layer and
The tip of the core wire of the bull
Fix this to the stopper at any slide position.
A fixing means is provided, and on the outer surface of the attachment,
A cable coating layer stepping-off tool having a scale for displaying a sliding amount of the stopper .