JPH0479715A - Method and device for removing cable coating material - Google Patents

Abstract

PURPOSE:To improve the operability of removal of a coating maternal greatly by disposing two cutting blades at positions on the same circumference of the outer periphery of a cable and in a state of facing each other at an angle of 180 degrees, by rotating the cutting blades in the direction of the circumference and then by disposing them in the direction parallel to the longitudinal direction. CONSTITUTION:Two cutting blades 1 are disposed at positions on the same circumference E of a covering of a cable 41, at right angles to the axial direction and in a state of facing each other at an angle of 180 degrees. The cutting blades 1 held by two discrete holders 2 are made to cut in toward the center of the cable on the same circumference of the covering of the cable, corresponding to the thickness of the covering. In this state of cutting in, the blades are rotated at an angle of 180 degrees, so as to cut the covering of the cable. Moreover, the same process as the above is executed at positions on the circumference F which becomes the other end part of the length of removal of the covering of the cable 41. Next, the two cutting blades 1 are turned to be parallel to the axial direction of the cable 41 and drawn in a state of facing each other at the angle of 180 degrees from the position of the circumference E or F to the position of the other end by a drawing handle 3. Thereby the state of a coating material being removed is brought about.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for safely and reliably removing a communication cable sheathing material with a small number of work steps.

2. Description of the Related Art Conventionally, the outer sheath of a communication cable is removed by a sheathing removal device shown in FIGS. 11 and 12.

FIG. 11(a) is an explanatory diagram showing cutting in the circumferential direction, and FIG. 11(1)) is an explanatory diagram showing cutting in the longitudinal direction.
j2 is a circumferential cutting blade, j3 is a longitudinal cutting blade, j≠ is a guide,! In the evening, it was the batting club.

Insert the cable in the state shown in Figure (a) at the cutting start position with this coating material removal device, rotate the device in the circumferential direction to cut the cable in the circumferential direction, and then remove the cable coating from the guide section and longitudinal cutting blade. It bites into the material and cuts in the length direction while striking the striking part with a hammer or the like.

Cut to the end position, and then cut in the circumferential direction at that position in the same way as the cutting start position. Thereafter, the guide portion and the longitudinal cutting blade are bitten into the cable sheathing material again to cut the cable in the longitudinal direction, and a strip-shaped cut several millimeters wide is made in the cable sheathing material. After peeling off this strip-shaped jacket using nippers or the like, the remaining cable sheathing material is removed.

FIG. 12 is a perspective view of a cable sheath removal device that does not use a hammer or other blow, where 1+ is a cutting blade, ! 7 is the cable receiver, YG is the blade direction handle, J is the cutting blade feed dial, Otsu 0 is the cable receiver and the upper and lower dials. Place this sheathing material removal device between the cutting blade and the cable receiver at the cutting start position, align the cutting blade in the circumferential direction with the blade direction handle, and then use the blade's feed dial to move from the outer periphery of the sheath to the cable center. After making a cut in the circumferential direction by cutting the cutting blade in the direction of Cut in the horizontal direction, and then cut in the circumferential direction at that position. After that, align the cutting blade in the length direction with the blade direction handle again, move the sheathing material removal device to the cutting start position, cut the sheath into strips several millimeters wide, and cut the cable sheath in the same way as shown in Figure 11. remove.

In both the methods shown in Figs. 11 and 12, the couple covering material cutting process is shown in steps (1) to (4) in Fig. 13(a).
The process of removing the cable sheathing material is shown in Figure 13 (
The steps from a) to FIG. 13(d) are involved.

The cable sheathing material cutting process is shown in FIG. 13(a) (
1), (2), (4), and (3) may be performed in the order.

In the method shown in Fig. 11, (2),
Since the cutting step (3) is performed, the workability is extremely poor. In addition, in optical fiber cables, the impact compresses the optical fiber through the guide portion, affecting the optical signal, and in the worst case, causing problems such as optical fiber breakage.

In addition, in the method shown in FIG. 12, (1) and (
Although steps 2) and (4) have relatively little effect on the optical signal, when performing the cutting step (3) in Figure 13(a), the cable jacket has already been cut in step (2). Therefore, when the cutting blade is sent in, the cable jacket tends to escape toward the center of the cable, and the circularity of the cable changes easily. Therefore, performing the cutting step (3) after the cutting step (2) often makes it impossible to cut the cable even if the cutting blade is fed by an amount equivalent to the thickness of the cable jacket.

Therefore, it is often necessary to feed the cutting blade by an amount equivalent to the thickness of the cable sheathing material.
This is an extremely difficult task that relies on skill and skill. In addition, if the cutting blade is fed too much, the cutting blade may press on the optical fiber like the guide section in the method shown in Fig. 11, affecting the optical signal, or in the worst case, the cutting blade may This has caused problems such as fiber breakage.

On the other hand, removing the covering material from communication cables is done inside manholes or on pillars. Needless to say, in these poor working environments, a removal device with better workability and safety is desired.

When working inside a manhole or on a pillar, it is necessary to remove the covering material with one hand in order to prevent the convergence of communication cables and to ensure safety. However, both of the coating material removal devices shown in FIGS. 11 and 12 cannot be operated with one hand, causing problems in workability and safety.

Problems to be Solved by the Invention The purpose of the present invention is to reduce the number of work steps without stressing the optical fiber core, without affecting the optical signal, without causing fiber breakage, etc. It is an object of the present invention to provide a method and a device for safely and reliably removing the covering material of a communication cable, by which the covering material can be removed, the workability is dramatically improved, and the covering material can be removed safely and reliably.

Means for Solving the Problems The method for removing a cable sheathing material of the present invention is to cover the outermost sheath of a cable core made up of a set of multi-core communication wires with a sheathing material made of a plastic material or a composite material of a plastic material and a metal material. In the method for removing the sheathing material of the cable in the longitudinal direction of the cable, the method comprises: 2.
arranging two cutting blades at the same circumferential position on the outer periphery of the cable and facing each other at 180 degrees in the axial direction, and holding the cable by a holder holding the cutting blades;
arranging the two cutting blades at right angles to the longitudinal direction of the cable; making a cut with the two cutting blades from the outer periphery of the cable sheathing material toward the center of the cable; a step of rotating and cutting two cutting blades cut into a material equivalent to the material thickness in the circumferential direction of the cable sheath; a step of arranging the two cutting blades in parallel to the longitudinal direction of the cable; The method consists of pulling the two cutting blades from the circumferential cutting part of the cable outer sheathing to the circumferential cutting part at the other end and cutting and removing the cable sheathing material, and carrying out the cable sheathing material removal method. two cutting blades that are 180 degrees opposed to each other on the same circumference and can be switched between the cable circumferential direction and the cable longitudinal direction; a cutting blade operating section to which the cutting blades are attached; and the cutting blade operating section. a cable gripping means provided on the cutting blade operating section; a traction handle provided on the cutting blade operating section and freely rotatable 360 degrees with respect to the cutting blade operating section; and the traction handle adjustable according to the outer diameter of the cable. and a table outer diameter adjusting means, and the cutting blade operating section is configured so that the cutting blade can be moved in the direction of the cable center, and the cutting blade and the cable gripping means are arranged so that the cutting blade is a fixed cutting blade and the cable gripping means is a fixed cutting blade. The gripping means may be a gripping roller, the cutting blade may be a rotating cutting blade, and the cable gripping means may be a cable receiver having a cable gripping groove, the cutting blade may be a rotating cutting blade, and the cable gripping means may be a gripping roller. The cable outer diameter adjusting means is configured with a spring pulling means or the like.

Effect: According to the method of the present invention, the optical fiber core wire is not compressed, the optical signal is not affected, the core wire is not cut, etc., the number of work steps is reduced, the coating can be removed with one hand, and the work efficiency is improved. This dramatically improves communication cable sheathing material safely and reliably.

The device of the present invention eliminates the need for conventional devices that rely on intuition or skill to determine the amount of feed of the cutting blade, and the cutting blade can be removed with one hand without putting pressure on the optical fiber core. It has a configuration that allows cutting by extremely light operation of the cutting blade.

Embodiment FIG. 1 is an explanatory diagram of a characteristic feature of the cable sheathing material removal method of the present invention, and FIG. 2 is a diagram showing the sheathing material removal process by the method of FIG. 1.

The method for removing cable sheathing material of the present invention involves disposing two cutting blades at the same circumferential position E on the outer sheath of the cable and facing each other by 180 degrees perpendicular to the axial direction, and using two separate holder colls. The cutting blade l held by the cable is cut on the same circumference of the cable sheath in the direction of the center of the cable to an amount equivalent to the thickness of the sheath, then rotated 180 degrees to cut the cable sheath as shown in Figure 2. Step (1) is further changed to be parallel to the direction in which the cable sheath is to be removed, and the two cutting blades are cut 180 degrees apart from the circumference E or circumference F position to the other end position. is towed by the towing handle 3 and the step (3) in FIG. 2 is performed.

Next, FIG. 3 is a perspective view of a first embodiment of the apparatus for carrying out the method for removing cable sheathing material of the present invention, and FIG. 4 is a plan view of a pair of cutting blade operation parts for removing the cable in FIG. Figure shows.

The configuration of the device of the present invention will be explained.

In Fig. 3, ≠ is the cutting blade operating section, j is the operating cylinder section,
O is the cutting blade operation shaft body, 4a is the triangular blade, 7 is the disc body that fixes the cutting blade operation part, g is the blade direction conversion handle, ri is the cutting blade feed dial, 10 is the cable gripping roller holder, // is the towing handle, /2 is the cable gripping roller, /
3 is a cable gripping fixing plate, /3-/ is a long groove, /II-
is the fixing screw, /! is the hinge mechanism, /Kk, /! B is the arm of the hinge mechanism, isc is the connecting shaft, /! f),/,!
;E is the arm/! The cylindrical gripper that fixes A and /3B and pulls the device is shown.

L-shaped hinge arms /J'4, /jB are rotatably connected to one end of the two towing handles // by a connecting shaft body /jC, and the hinge arms /sA, isB are connected to a cylindrical gripping body / JD, /
Fix the towing handle // with jE, make a hole in the other end, attach the disk body 7 so as to be rotatable, make a hole in the disk body 7, and insert the cutting blade operating part into the hole. Insert the ≠ and press the cutting blade operation part μ
The cable gripping roller holder 10 is fixed inside the towing handle at the tip end of the cable.

The configuration of the cable gripping roller holder 10 will be explained based on FIG. 9.

A rod-shaped protrusion 10-/ is formed on the top and bottom, a hole 10-2 is provided in the center for inserting the cutting blade operation part≠, and an array of cables is held between the upper and lower protrusions 10-7 on the left and right sides of the hole 10-2. A roller/2 is rotatably mounted, and an inverted trapezoidal recess 10-3 for holding the cable is formed at the center of the upper and lower protrusions 10-/.

A cable gripping fixing plate /3 is provided on the upper surface of the two towing handles l/ nearer to the cutting blade operation part than the center, and is fixed with one fixing screw/g, and the other fixing screw/g is attached to the long groove part/ 3
-7 to adjust the spacing between the towing handles 77.

Next, the configuration of the cutting blade operating shaft will be explained based on FIG. 8.

Operation cylindrical part! Insert the cutting blade operation shaft body 6 consisting of a shaft part O-2 which has a cylindrical part &-/ at the tip and is connected and provided with a thread, and feed the cutting blade into the threaded shaft part O-2. The dialer is screwed together, the blade direction changing handle g is fixed to the tip of the shaft part t-2, and the triangular cutting blade 6a is inserted and secured to the tip of the cylindrical part t-2 (Fig. 4 (1)). It consists of a missing part as shown in the figure,
A hole is provided in the operating cylindrical part j at a position of 180 degrees at a right angle to the axial direction and reaches the cylindrical part 6-/. Rotation locking part jA of the cutting blade operating shaft B, which is inserted, for example, a bearing sphere is inserted into the hole, a spring is arranged on the upper part, and the shaft is sealed with a screw.
and configure it.

The order of cutting and removing the cable sheathing according to the first embodiment of the device of the invention will now be described.

Loosen the fixing screw/4' and connect the hinge mechanism/j to the connecting shaft/j
Open the two towing handles / with the rotation axis as the rotation axis, hold the cable between the cable holding rollers 12 of the cable gripping roller holder 10, and adjust the fixing screw /≠ according to the outer diameter of the cable to grip the cable.

Next, connect the blade direction conversion handle g to the groove O-2 of the cutting blade operation shaft O and the rotation locking part! Set the fixed cutting blade A to be perpendicular to the longitudinal direction of the cable.

Rotate the cutting method feed input dial and press the cutting blade operating shaft 6.
Rotate and cut into the cable by an amount equivalent to the thickness of the cable sheathing material.

Rotate the device relative to the cable to cut circumferentially.
Next, set the fixed cutting blade Otoa parallel to the longitudinal direction of the cable using the blade direction conversion handle g, and set the traction handle l/ which can rotate 360 degrees with respect to the cutting blade operation part≠.
Tow it to the required cutting length. At this time, even if the cable has a fixed cutting force of two sheets, the pulling tension is approximately 25 kyf due to the effect of the cable gripping roller/2, and sufficient pulling is possible. In addition, due to the effect of the traction handle // which can be freely rotated with respect to the cutting axis, the direction of traction tension acting on the cutting point is stabilized, making it extremely easy to cut the most difficult cable longitudinal sheathing with one hand. became possible.

At the cutting end position, the device of the present invention is rotated in the same way as at the cutting start position to cut in the circumferential direction, resulting in the cutting form shown in Fig. 2 (]) and the coating material removal form shown in Fig. 2 (b). .

In this way, two cutting blades are provided facing each other at 180 degrees,
The sheathing material cutting process and sheathing material removal process are reduced, and the sheathing material in the longitudinal direction of the cable can be cut extremely easily.

FIG. 5 shows a perspective view of a second embodiment of the apparatus of the present invention, and FIG. 6 shows a plan view of the apparatus of FIG. 5 partially shown on two steel surfaces.

The configuration of a second embodiment of the device of the present invention will be described.

In Figures 5 and 6, 2/, 22 is the upper main body, 22 is the lower main body, 23 is the rotary blade holder, 2≠ is the rotary blade, 2 is the shaft, ko is the upper and lower knobs, 1 is the positioning ring, and 27 is the positioning ring. 2g is a hexagon socket head bolt 1.29 is a cutting blade direction switching lever, 30 is a cable receiver, 3/ is a steel ball, 32 is a spring, 33 is a set screw, 3≠ is a connecting plate, 3 is a spacer, 3 is a 37 is the towing handle, 3g' is the connecting fitting (
5), 3 is the connecting metal fitting (B), 1Lt0 is the connecting nut,
shows.

24t is a rotary cutting blade with two freely rotatable cutting blades facing each other at 180 degrees, and 37 is a towing handle made of steel wire with an outer diameter of 5 mm and made into a ring shape that can freely rotate 360 degrees with respect to the cutting axis. , 30 is a cable gripping groove, and λ is a cable receiver with a groove, and λ is a cutting blade direction switching lever 2 that switches the rotary cutting blade between the cable circumferential direction and the cable length direction by rotating 90 degrees. The cutting blade has a cutting depth adjustment dial that has a scale and can be adjusted at intervals of 0.1 wn.
The cutting blade can be inserted and removed once in one rotation.

3≠ is a connection plate, 3O is a fixing screw, and the cable grip ■ Slide the cable receiver 30, which forms the groove, on the connection plate 3≠ through the long groove 3≠-/ and fix it with the fixing screw 3O to grasp the cable. This mechanism allows it to be used with any cable diameter.

Reference numeral 39 denotes a connecting fitting for the towing handle 37, which may be a one-touch type using a screw or a spring and a ball bearing. While in Example 1 the pulling tension was reduced by cable gripping rollers, in this example the cable gripping means is groove-shaped;
The cutting blade is used as a rotating mechanism to reduce the pulling tension.

Loosen the fixing screw 3 O of /≠, insert the cable whose covering material is to be removed into the cable gripping V groove of the cable receiver 30, and adjust the fixing screw 3 O to grasp the cable.

Further, the connecting fitting 3 of the towing handle 37 can be attached and detached as necessary to make it easier to tow. The subsequent cutting process and removal process are the same as in Example 1.

Even though the cable gripping means is in the form of a groove, the rotary cutting blade is used, and as a result, the pulling tension is approximately 11 kpf, which is halved compared to Example 1, further improving workability.

In addition, since the rotating cutting blade is used, light pulling tension can be obtained even if the cable gripping means is changed from roller gripping to groove gripping, the pulling handle is made of steel wire and processed into a ring shape, and a rotation mechanism is added, and the direction of the cutting blade can be changed. This embodiment is advantageous in terms of cost because the number of parts is reduced by setting the lever inside the towing handle and reducing the size.

FIG. 7 is a diagram for explaining the third embodiment of the present invention,
The la cutting blade in Example 1 was replaced with a 3 μ rotary cutting blade in Example 2. Therefore, due to the effects of the cable gripping roller and the rotating cutting blade, the pulling tension is further reduced to about 10 kpf, which is the lightest. The steps of attaching the cable to the cable, cutting the covering material, and removing the covering material are the same as in Example 1.

FIG. 10 is a diagram illustrating a fourth embodiment of the present invention.

violet 1" example: flF) W: Storage L gripping fixing plate and gripping hand U fixing screw /≠ Instead of /≠, /7 is a gripping means that is pulled by a spring, and it is fixed by the cable jacket. Since the cable is gripped by pressure, the depth of cut of the cutting blade can always be made equivalent to the appropriate thickness of the cable sheathing material.

Therefore, when the cable is manufactured, the mechanism is able to prevent the optical fiber core from being cut due to too much blade feeding, and from repeating the cutting process due to underfeeding, even when the outer diameter of the cable changes due to cable installation, cable pulling, etc. The steps of attaching the cable to the cable, cutting the covering material, and removing the covering material are the same as in Example 1.

Effects of the Invention As described above, the coating material removal method and apparatus of the present invention do not require a cutting step by hitting with a hammer or the like, and do not affect the optical fiber core wire or optical signal. Also, 180
Since two cutting blades are provided facing each other at the same time, the sheathing material cutting and removal steps are reduced, and the sheathing material in the longitudinal direction of the cable, which is the most difficult, can be easily cut. In particular, the effect of reducing the pulling tension by the rotating cutting blades is remarkable, and even when cutting the cable in the longitudinal direction with two rotating cutting blades, the pulling tension is approximately 11 kpf, which is extremely effective.

In addition, the provision of a traction handle that can freely rotate 360 degrees relative to the cutting axis stabilizes the direction of the traction tension acting on the cutting point, making it extremely easy to remove the sheathing material in the longitudinal direction. operation was made possible.

Because of these advantages, it is possible to dramatically improve the cable sheathing removal device for manholes and pillars where communication cables are congested, which has been a problem in the past.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the method that characterizes the cable sheathing material removal method of the present invention, Fig. 2 is a cable sheathing material removal process diagram by the method of Fig. 1, and Fig. 3 is a cable sheathing material removal method of the present invention. FIG. 4 (a) is a perspective view of the first embodiment apparatus for carrying out the
) is a plan view of the pair of cutting blade operating parts that remove the cable in Figure 3, (b) is a sectional view with the triangular blade attached,
FIG. 5 is a perspective view of a second embodiment of the apparatus for carrying out the cable sheathing removal method of the present invention, FIG. 6 is a plan view partially sectionalized from FIG. 5, and FIG. 7 is a cable sheathing removal method of the present invention. FIG. 8 is a perspective view of a third embodiment device for carrying out the cable removal method; FIG. 8 is a plan view showing one of the pair of cutting blade operation parts for removing the cable in FIG. 7; and FIG. 9(a). is a front view of the cable holding roller support stand in Fig. 6, viewed from the direction in which the cutting blade is held;
(b) Figure is a side view of the cable holding roller support stand, No. 10.
The figure is a perspective view of a fourth embodiment of the apparatus for implementing the cable sheathing material removal method of the present invention, FIG. ) Figure 12 is a perspective view of a conventional cable sheathing removal device that does not use blows such as hammers, and Figures 13 (a) to (d) are cables cut in the length direction. A covering material removal process diagram is shown. ≠: Cutting blade operation part, j: Operation cylindrical part, 6: Cutting blade operation shaft body, 6a: Triangular blade, 7: Disc body for fixing the cutting blade operation part, r: Top direction conversion knob, Ta : Cutting force feed dial, lO: Cable gripping roller holder,
l/: Traction handle, 12: Cable gripping roller,
13: Cable gripping fixing plate, /3-/: Long groove part, l
t: Fixed screw, /j: Hinge mechanism, /! ;A,/! f
3: Arm of hinge mechanism, /jC: Connection shaft, /! ;D,/! ; E", cylindrical grip, 2/, 22: upper body, lower body, -23 = rotary blade holder, 2 is 2 rotating blades, 2j: shaft, 26 2 upper and lower knobs, 27: positioning ring, 2 and 26 square hole bolt,
2: Cutting blade direction switching lever 30: Cable receiver, 3/: Steel ball, 32 Spring, 33: Set screw, 3t = Connection plate, 3J Ni spacer, 3O: Fixing screw, 37: Towing handle, 3g: Connection Metal fittings (A), 3:
Connecting fitting (B), ≠0: Connecting nut. Patent Applicant Nippon Telegraph and Telephone Corporation Patent Attorney Isao Abe Figure 2 Figure 5 118 Figure 1αJ Figure 9 (b Figure 13

Claims (6)

[Claims] (1) A cable whose outermost sheath is made of a cable core made up of a collection of multiple communication wires is covered with a sheathing material made of a plastic material or a composite material of plastic and metal materials, and the sheathing material is inserted in the longitudinal direction of the cable. In the coating material removal method for removing the coating material, two cutting blades are arranged at the same circumferential position on the outer circumference of the cable and axially opposed to each other at 180 degrees, and a holder holding the cutting blades is used. a step of holding the cable; a step of arranging the two cutting blades at right angles to the longitudinal direction of the cable; and a step of cutting the two cutting blades from the outer periphery of the cable sheathing material toward the center of the cable to a thickness equivalent to the thickness of the cable sheathing material. a step of rotating and cutting the two cutting blades that have been cut to a thickness equivalent to the thickness of the cable sheathing material in the circumferential direction of the cable sheath; a step of cutting the two cutting blades in a direction parallel to the longitudinal direction of the cable; and a step of pulling the two cutting blades from the circumferential cut portion of one cable outer sheath to the circumferential cut portion of the other end to cut and remove the cable sheathing material. Cable jacket removal method. (2) two cutting blades that face each other 180 degrees on the same circumference and can be switched between the cable circumferential direction and the cable longitudinal direction;
a cutting blade operating section to which the cutting blade is attached; a cable gripping means provided on the cutting blade operating section; and a cable gripping means provided on the cutting blade operating section and capable of freely rotating 360 degrees with respect to the cutting blade operating section. and a cable outer diameter adjusting means that can be adjusted according to the outer diameter of the cable, and the cutting blade operating section is configured to allow the cutting blade to move toward the center of the cable. cable sheathing removal device. (3) The cable sheathing material removing device according to claim 2, wherein the cutting blade is a fixed cutting blade, and the cable gripping means is a gripping roller. (4) The cable sheathing material removing device according to claim 2, wherein the cutting blade is a rotary cutting blade, and the cable gripping means is a cable receiver having a cable gripping V-groove. (5) The cable sheathing material removing device according to claim 2, wherein the cutting blade is a rotating cutting blade and the cable gripping means is a gripping roller. (6) Claims 2 or 3 or 5, characterized in that the cable outer diameter adjusting means is a spring attraction means.
Cable sheathing removal device as described in section.