JP4006345B2 - Cord sheath removal tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cord coating removal tool for removing a part of a coating provided on a cord such as a plastic optical fiber cord.
[0002]
[Prior art]
When a plug is attached to a cord such as a plastic optical fiber cord, the covering of the cord may be removed to expose the wire. At that time, when the cross-sectional shape of the cord is circular, for example, a coating removal tool described in Patent Document 1 is used.
However, for non-circular cords such as plastic optical fiber cords having multi-core single-row strands and elliptical-shaped strands of plastic optical fiber cords, etc. It was difficult to apply the coating removal tool. Therefore, conventionally, as a tool for removing the coating of such a non-circular cross-section cord, a combination of a U-shaped blade and a parallel blade or a combination of two U-shaped blades is used. The cord was sandwiched between a U-shaped blade and a parallel blade, or two pairs of U-shaped blades, a cut was formed in the coating, and the coating separated by this cutting was removed to remove the coating. .
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-117344
[Problems to be solved by the invention]
However, in the conventional sheath removal tool using a U-shaped blade, it is easy to form a cut in the coating with the opposite blade of the U-shaped blade, but the U-shaped blade and the parallel blade or another When the cord is sandwiched between the U-shaped blades, the other blade comes into contact with the opposing blades of the U-shaped blade to become resistance, so it is difficult to form a cut. As a result, not enough cuts are formed to remove the coating, and if it is attempted to remove the coating forcibly with the insufficient cuts, the coating removal work becomes difficult and the cord strands are plastically deformed. There was a risk of damage, damage, or disconnection.
[0005]
The object of the present invention is to form a notch in the coating that is sufficient to remove the coating, even for a cord having a cross-sectional aspect ratio that is not 1, especially an element wire having an elliptical cross-section. An object of the present invention is to provide a cord covering removal tool that is easy and industrial for removal, and that can prevent plastic deformation or damage of the strands and disconnection.
[0006]
[Means for Solving the Problems]
The cord sheath removing tool of the present invention is a cord sheath removing tool for removing a sheath of a cord whose cross-sectional aspect ratio is not 1 ,
A tool body in which an L-shaped groove comprising a first groove and a second groove that is continuous with and substantially orthogonal to the first groove;
A pair of first cutting blades provided in the first groove, the blade edges facing each other toward the inside of the first groove and disposed along the extending direction of the first groove;
A pair of second cutting blades provided in the second groove, the blade edges facing each other toward the inside of the second groove and disposed along the extending direction of the second groove;
Holding a code, and a movable member which codes between and between the pair of second cutting edge of the pair of first cutting edge can move the L-shaped groove so as to move,
The first cutting blade is used to form a first cut on the coating, and the second cutting blade is used to form a second cut on the coating.
In the cord coating removal tool of the present invention, the distance between the pair of first cutting edges and the distance between the pair of second cutting edges may be different.
Moreover, the code | cord coating removal tool of this invention may make a coating | cover form the 2nd cut | interval which continues with a 1st cut | notch with a 2nd cutting blade.
Alternatively, the cord coating removal tool of the present invention may be one in which the second cutting blade is used to form a second cut in the vicinity of the first cut.
[0007]
In this specification, “the second cut is formed in the coating in the vicinity of the first cut” is not a cut that is completely continuous with the first cut but the second cut in the vicinity of the first cut. The end of the cut. That is, it means that the end of the second notch is formed near the end of the first notch so that the first notch and the second notch are easily connected when an external force is applied.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a cord coating removal tool (hereinafter abbreviated as a coating removal tool) of the present invention will be described with reference to the drawings.
This embodiment is a tool for removing the covering of the plastic optical fiber cord 11 having an elliptical cross section as shown in FIG. Here, the plastic optical fiber cord 11 has two optical fiber strands 12 and 12 made of plastic, a collective coating layer 13 around the optical fiber strand 12, and an elliptical cross section covering the collective coating layer 13. The sheath 14 is a sheath.
FIG. 1 is a front view showing a coating removal tool of the present embodiment.
The coating removal tool 1 includes a tool body 5 having an L-shaped groove 4 formed of a first groove 2 and a second groove 3 that is substantially orthogonal to the first groove 2 and the first groove 2, and the first groove 2. A pair of first cutting blades 6, 6 provided in 2, a pair of second cutting blades 7, 7 provided in the second groove 3, and an L-shaped groove 4 attached to the tool body 5. And a movable body 8 movable along the line.
[0009]
The tool body 5 is formed by forming an L-shaped groove 4 in a block made of, for example, rectangular parallelepiped or rectangular steel. The first groove 2 of the L-shaped groove 4 is a groove formed in the horizontal direction on the front surface 21, one end of which is open to the outside of the tool body 5, and the other end is the second groove 3. Communicate. The second groove 3 is formed on the front surface 21 substantially perpendicular to the first groove 2 and upward, and one end of the second groove 3 not communicating with the first groove 2 is formed on the tool body 5. It has an end 22 inside.
Further, the width X1 of the first groove 2 and the width X2 of the second groove 3 are different, and X1 <X2.
[0010]
Further, as shown in FIG. 2, the tool body 5 is formed with a concave guide 23 for guiding the movable body 8 along the L-shaped groove (first groove 2 in the illustrated example). By forming such a guide 23, the movable body 8 can be easily moved along the L-shaped groove 4.
The width of the guide 23 is the same as the width X1 of the first groove 2 at the location along the first groove 2, and the same as the width X2 of the second groove 3 at the location along the second groove 3. Has been.
[0011]
The pair of first cutting blades 6, 6 provided in the first groove 2 are disposed along the extending direction of the first groove 2 while their blade edges face each other toward the inside of the first groove 2. Has been. On the other hand, the pair of second cutting blades 7 and 7 provided in the second groove 3 face each other toward the inside of the second groove 3 and extend in the direction in which the second groove 3 extends. Are arranged. The first cutting blades 6, 6 and the second cutting blades 7, 7 are continuous with the first cutting with the first cutting blades 6, 6 and the second cutting with the second cutting blades 7, 7 or They are arranged at substantially the same height so as to be located in the vicinity. Here, the cutting blade is a cutting edge formed by sharpening the tip of one side of a thin metal plate.
[0012]
The distance Y1 between the pair of first cutting edges 6 and 6 is different from the distance Y2 between the pair of second cutting edges 7 and 7 (Y1 ≠ Y2). Thus, by making Y1 and Y2 different, the sheath of the plastic optical fiber cord 11 having an elliptical cross section can be removed. That is, the distance Y1 between the pair of first cutting blades 6 and 6 is such that when the cross section of the plastic optical fiber cord 11 is viewed, notches can be formed at both ends of the long diameter L as shown in FIG. ing. The distance Y1 between the pair of second cutting blades 7 and 7 is such that the cuts can be formed at both ends of the short diameter S when the cross section of the plastic optical fiber cord 11 is viewed as shown in FIG. It has become.
Furthermore, Y1> Y2, and the plastic optical fiber cord 11 can be easily pulled out at the end of the L-shaped groove 4 to remove the sheath.
Further, the interval Y1 between the pair of first cutting blades 6 and 6 and the interval Y2 between the pair of second cutting blades 7 and 7 are variable so as to correspond to the difference in the cross-sectional shape of the plastic optical fiber cord 11. Preferably it is.
[0013]
As shown in FIG. 2, the movable body 8 includes a holding portion 24 and a flange portion 25, and the holding portion 24 has a substantially cylindrical shape, and a cord insertion hole 26 through which a cord is inserted is provided. Is formed. The flange portion 25 is a square plate provided at one end portion of the holding portion 24 that opens.
The cross-sectional shape of the cord insertion hole 26 is matched with the cross-sectional shape of the plastic optical fiber cord 11 and is elliptical. Thus, by matching the cross-sectional shape of the cord insertion hole 26 with the cross-sectional shape of the plastic optical fiber cord 11, the plastic optical fiber cord 11 can be easily inserted.
[0014]
When the movable body 8 is attached to the tool body 5, the cord insertion hole 26 of the holding portion 24 is arranged so that the minor axis direction of the cross-sectional ellipse is substantially the same as the direction in which the cutting edge of the first cutting blade 6 extends. Is formed.
As shown in FIG. 2, the cord insertion hole 26 is formed so that the formation direction thereof and the direction in which the cutting edge of the first cutting blade 6 faces are substantially orthogonal. That is, when the plastic optical fiber cord 11 is inserted into the cord insertion hole 26, the longitudinal direction of the plastic optical fiber cord 11 and the direction in which the cutting edge of the first cutting blade 6 faces are substantially orthogonal.
Further, when the movable body 8 moves through the L-shaped groove 4, the cord insertion hole 26 is formed so that the plastic optical fiber cord 11 is interposed between the pair of first cutting blades 6 and 6 and the pair of second cutting blades. 7, 7 is formed at a position that can move.
[0015]
When the movable body 8 is attached to the tool body 5, as shown in FIG. 2, a flange 25 is formed in the tool body 5 from one end of the first groove 2 opened to the outside of the tool body 5. The guide 23 is fitted (the movable body 8 is removed from the tool body 5 in FIG. 1).
Here, the length A of the movable body 8 is substantially the same length as the width X1 of the first groove 2 or slightly shorter, and the width B is substantially the same length as the width X2 of the second groove 3 or Since the length is slightly short and X1 and X2 are not equal (X1 <X2), it is possible to prevent the movable body 8 from being attached in the wrong direction when it is attached to the first groove 2.
[0016]
Using such a coating removal tool, the sheath as the coating is removed as follows.
First, the plastic optical fiber cord 11 is inserted into the cord insertion hole 26 of the holding portion 24 and protrudes from the cord insertion hole 26. Next, the movable body 8 is attached to the tool body 5 from one end opened to the outside of the tool body 5.
Next, as shown in FIG. 4A, the movable body 8 is slid along the first groove 2, and the plastic optical fiber cord 11 is paired with the pair of first cutting blades 6, as shown in FIG. 6 to form a first cut. This first cut is in a direction substantially perpendicular to the longitudinal direction of the plastic optical fiber cord 11, and as shown in FIG. 3, when the cross section of the plastic optical fiber cord 11 is viewed, the sheath near the both ends of the major diameter L has a shorter diameter. It is formed in the same direction as S (first notch 16).
[0017]
Next, the movable body 8 is further slid, and after the movable body 8 reaches the end of the first groove 2 as shown in FIG. 4B, the movable body 8 is moved as shown in FIG. Is slid along the second groove 3 and the plastic optical fiber cord 11 is moved between the pair of second cutting blades 7 and 7 to form a second cut. This second cut is in a direction substantially orthogonal to the longitudinal direction of the plastic optical fiber cord 11, and when the cross section of the plastic optical fiber cord 11 is viewed as shown in FIG. It is formed in the same direction as L (second cut 17), and is continuous with the first cut 16 in the orthogonal direction.
As described above, the first cut and the second cut are formed in the sheath to form a cut around the periphery of the collective coating layer, and then the plastic optical fiber cord 11 is pulled out of the movable body 8 and the sheath The part can be separated and removed to expose the strands.
[0018]
In the embodiment described above, the plastic optical fiber cord 11 held by the movable body 8 is passed between the pair of first cutting blades 6 and 6 provided in the first groove 2 of the tool body 5. After the first cut is formed, the plastic optical fiber cord 11 is moved between the pair of second cutting blades 7 and 7 provided in the second groove 3, and the first cut is continuous with the first cut. By forming 2 cuts, a cut can be formed in the sheath around the periphery of the batch coating layer. Thus, since the two cutting blades are not brought into contact with each other in order to form a cut around the periphery of the batch coating layer in the sheath, the resistance at the time of the cut formation is small. As a result, a notch sufficient to remove the sheath can be easily formed, which facilitates the coating removal operation and is industrial, and further, the optical fiber strand of the plastic optical fiber cord is plastically deformed or damaged. It can prevent sticking or disconnection.
[0019]
The present invention is not limited to the above-described embodiment example. For example, the plastic optical fiber cord may be a multicore single row as shown in FIG. 5 and the surface of the sheath 31 along the surface of the collective coating layer 32 (plastic optical fiber cord 33). According to the present invention, even with such a plastic optical fiber cord 31, the sheath which is a coating can be easily removed. Furthermore, a cord other than a plastic optical fiber cord (for example, an electric cord) may be used. However, since the plastic optical fiber cord is made of plastic and has a high possibility of plastic deformation or disconnection, the effect of the present invention is achieved. Particularly demonstrated.
Further, the width X1 of the first groove 2 and the width X2 of the second groove 3 are set to X1> X2, or the interval Y1 between the first cutting blades 6 and 6 and the interval Y2 between the second cutting blades 7 and 7 are set. And Y1 <Y2. In this case, the direction in which the plastic optical fiber cord is attached to the movable body 8 and the direction in which the movable body 8 is attached to the tool body 5 also need to be appropriately changed.
Furthermore, in the above-described embodiment, an elliptical plastic optical fiber cord having a cross-sectional shape particularly suitable for the cord coating removal tool of the present invention is used. However, the present invention is not limited to such a plastic optical fiber cord, and other than an elliptical shape. the cross-sectional aspect ratio may be a code of a non-circular cross-sectional shape is not a 1. Even with a cord having such a cross-sectional shape, the coating can be removed.
[0020]
【The invention's effect】
According to the present invention, it is possible to form a notch sufficient to remove the coating even in the case of a non-circular cross-section cord with a cross-sectional aspect ratio of 1 such as a strand having an elliptical cross-section. In addition, the coating removal operation is easy and industrial, and the plastic deformation, scratching or disconnection of the strands can be prevented.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a plastic optical fiber cord coating removal tool according to the present invention.
FIG. 2 is a cross-sectional view showing an aspect when a cut is formed in a coating of a plastic optical fiber cord.
FIG. 3 is a side view showing an example of a plastic optical fiber cord.
FIG. 4 is a front view for explaining the operation of the embodiment of the plastic optical fiber cord coating removal tool of the present invention.
FIG. 5 is a side view showing another example of a plastic optical fiber cord.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plastic optical fiber cord coating removal tool 2 1st groove | channel 3 2nd groove | channel 4 L-shaped groove | channel 5 Tool main body 6 1st cutting blade 7 2nd cutting blade 8 Movable body 11 Plastic optical fiber cord 12 Optical fiber element Wire (elementary wire)
14 sheath
16 First cut 17 Second cut

Claims (4)

A cord sheath removing tool for removing a sheath of a cord whose cross-sectional aspect ratio is not 1 .
A tool body having an L-shaped groove formed of a first groove and a second groove that is continuous with and substantially orthogonal to the first groove;
A pair of first cutting blades provided in the first groove, the blade edges facing each other toward the inside of the first groove and disposed along the extending direction of the first groove;
A pair of second cutting blades provided in the second groove and facing each other toward the inside of the second groove and disposed along the direction in which the second groove extends;
Holding a code, and a movable member which codes between and between the pair of second cutting edge of the pair of first cutting edge can move the L-shaped groove so as to move,
A cord coating removal tool, wherein a first cutting blade is used to form a first cut in a coating, and a second cutting blade is used to form a second cut in the coating. The cord coating removal tool according to claim 1, wherein a distance between the pair of first cutting blades is different from a distance between the pair of second cutting blades. The cord coating removal tool according to claim 1 or 2, wherein the second cutting blade forms a second cut continuous with the first cut on the coating. The cord coating removal tool according to claim 1 or 2, wherein the second cutting blade forms a second cut in the vicinity of the first cut with the second cutting blade.

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