JPH09311259A - Method and tool for cutting cable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate cutting and make operation efficient by bringing a rotary cutting blade into contact so that its surface slants at a specific angle to the axis of a cable terminal to be cut. SOLUTION: The surface of the rotary cutting blade 14 is applied to the slot coating end of a slot type optical fiber cable so that the axis of rotation slightly bends and the angle of contact between the cutting blade 14 and cable is 45-60 deg.. When a handle 16 is gripped and a driving shaft is rotated, the cutting blade 14 rotates on its axis and revolves around the peripheral surface of the cable to cut the slot coating. The slot coating is cut sequentially by pressing the cutting tool along the axis of the cable as the cutting advances; when the cable is cut within a desired range, the slot coating 22 is cut in a tapered shape from a part adjacent to the remaining slot coating after the slot coating 22 is cut and the major part forms an extremely thin remaining coating layer, thereby obtaining what is called a funnel shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to processing of a cable, particularly a cable end portion of an optical fiber cable, and an end portion of an optical fiber cable having a slot rod made of a resin such as polyethylene is stepped off and stored in a closure. And the cutting of a predetermined portion of the cable surface, such as a fine-thickness cut of the coating at the protection case attachment portion for terminating the internal cable.

[0002]

2. Description of the Related Art When a terminal portion of an optical fiber cable, particularly a slot type optical fiber cable, is housed in a closure, it is necessary to take a structure for supporting a tension member of the cable by a metal fitting for the closure. As shown in FIG. 5, the end portion of the cable jacket 25 is removed to expose the slot coating 22 in order to strip off the cable end portion 2, and then the optical fiber 24 is taken out from the slot 23 of this slot coating and folded back. The end portion 22a is peeled off for an appropriate length to expose the tension member 21. In this case, commercially available general tools such as pliers and a cutter were used to strip off the cable jacket 25 and the slot coating 22, and the cutout portion 22a in the figure was peeled off in the direction of the arrow.

[0003]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention In the above-mentioned slot type optical cable, in the case of stripping the cable end, especially in order to expose the tension member by stripping off the end side of the slot coating, In the past, since the slot coating diameter was thin for many minutes, it was not always difficult to carry out step peeling using a commercially available nipper or cutter knife as described above. However, when a steel stranded wire is used as the tension member, the number of core wires is 160 or more, and the cable slot covering diameter also becomes large.
With 60 cores, the slot coating diameter is φ18 mm, with 400 cores, the slot coating diameter is φ23 mm, and with 1000 cores, the slot coating diameter is φ26 mm, which makes it difficult to deal with the conventional processing method. As a countermeasure, large scissors are used. As shown, the end of the outer coating 25 of the cable 2 is peeled off with the cutting edge to expose the slot coating 22 and the slot 23.
Further, the optical fiber 24 is taken out and folded back, the cut portion of the slot coating 22 is further cut into a circle, and a screwdriver's head is screwed into the cut portion to slightly remove the removed portion of the slot coating 22 on the terminal side in the terminal direction (arrow direction). ), And then insert the pliers into the widened gap to sandwich the exposed tension member 21, and hit the pliers to cut and remove them. This processing requires a great deal of work as the number of cords increases, and the appearance of a simpler method has been desired.

[0004]

SUMMARY OF THE INVENTION The present invention has been made as a result of earnest studies in view of the above circumstances, and its outline is as follows.
The present invention relates to a cutting method using a rotary cutting blade having a cylindrical body having a plurality of cutting edges on the circumferential surface or a truncated cone having a small diameter at the tip side, and the surface of the rotary cutting blade is the surface of a cable end to be cut ( As a result, the surface of the cable end to be cut is brought into contact with the surface of the cable end at an angle of 45 ° to 60 °, and the rotary cutting blade is rotated while being brought into close contact with the end of the cable end to be cut and processed. Rotate around the cable end and cut away around it. A method of cutting a cable terminal (claim 1), in which the rotary cutting blade is gradually advanced over the cable to be processed along with the progress of this cutting, and the peripheral surface of a predetermined length of the cable to be cut is carved.
The method for cutting a cable end according to claim 1, wherein the rotary cutting blade is a cylindrical body (claim 2), and the rotary cutting blade is a truncated cone having a small diameter on the tip side. A method of cutting a cable terminal according to claim 1 (claim 3),
And a generally U-shaped frame body in a longitudinal cross-section, the open end of which has an opening into which the end of the cable to be cut can be inserted, and on the opposite side, the inside of the U-shaped bottom. A rotary cutting blade having a surface angle of a cutting edge of 45 ° to 60 ° with respect to the axis of the cable to be cut is arranged, and the rotary cutting blade can be rotated and rotated around the end surface of the cable to be cut. A tool for cutting a cable end (claim 4), wherein a shaft of a rotary cutting blade and a drive shaft are connected to a shaft gear, and the shaft gear is provided on an inner surface of a frame body. 5. A cutting tool for a cable terminal according to claim 4, wherein the shaft gear of the rotary cutting blade is engaged with the gear and is rotated by rotation of the drive shaft along the internal gear by rotation of the drive shaft. 5).

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The slot type optical fiber cable according to the present invention will be described. As can be understood from the step strip cable of FIG. 5, 2 is an optical fiber cable and 21 is a tension member such as a metal wire. 22 is a slot coating made of a resin such as polyethylene, and a plurality of slots 23 are spirally formed on the surface thereof. An optical fiber 24. Is stored. Two
5 is a cable jacket such as vinyl.

FIG. 1 is a perspective view showing a state in which the slot coated end of a slot type optical fiber cable is cut by using the cutting tool according to the present invention. 1 is the whole cutting tool of the present invention, and a frame 11 is a longitudinal section. It is U-shaped. That is, 11 is a frame body having an opening 12a at one end, and a vertical frame 11a is usually provided at the end of the opening end to form a square space at the opening end to facilitate insertion of a cable. ing. A portion corresponding to the bottom of the U-shape on the opposite side of the open end is a drive shaft 15 (which constitutes an L-shaped arm inside and outside the frame, which rotates the rotary cutting blade and rotates around the cable. A handle 16 is provided at the outer tip.)
Is provided so as to penetrate the bearing portion 13 provided at the center of the wall of the U-shaped bottom portion of the frame body 11, and the surface of the rotary cutting blade is at the slot coated end of the slot type optical fiber cable, and the rotary shaft 14a is slightly bent. And the contact angle between the cutting blade and the cable is 4
It is provided so as to contact at an angle of 5 ° to 60 °.

FIG. 2 shows the relationship between the slot coating 22 and the rotary cutting blade 14 made of a truncated cone, the surface of which is initially 45 ° -60 ° with the surface of the cable shaft or slot coating. Contact is made at an angle within the range, and the drive shaft 15 is driven at this angle to perform cutting. In the figure, 14a is a relatively flexible rotary shaft, and 14b is a cutting edge.

FIG. 3 is a side view of a cylindrical rotary cutting blade 14 which can be used in place of a truncated cone, and has a plurality of spiral cutting edges 14b on its surface, and its rotary shaft 14a has a rotary shaft 14a as shown in FIG. As shown in FIG. 3, the drive shaft 15 is driven by driving the handle 16, and the drive shaft 15 is rotated in contact with the surface of the cutting portion along with rotation to be cut. The rotating shaft 14a can be cut in the same manner as described above by pressing the cutting edge 14b against the slot coating 22 at a predetermined angle. Further, since the frame body 11 has a U-shaped vertical cross section, both sides are opened, and the cutting waste is discharged outward from the opening.

The removal of the slot coating will be described in more detail. When the handle 16 is grasped in the state shown in FIGS. 1 and 2 and the drive shaft is rotated, a cutting blade (in the shape of a truncated cone in the figure) is obtained. The rotary cutting blade 14) rotates and rotates on the peripheral surface of the cable to cut the slot coating. When the cutting tool is pushed in the axial direction of the cable in accordance with the progress of this cutting, the slot coating is sequentially cut. When cutting the target range, as shown in FIG. 4, the slot coating remaining after the cutting of the slot coating 22 is performed. Is cut into a taper shape 221 from a portion adjacent to, and most of them form a very thin residual coating layer 222, which is a so-called funnel shape. Since the coating layer to be removed by cutting to this extent is extremely thin, the tension member 21 can be exposed by easily removing it with conventionally known scissors or pliers.

FIG. 6 is an explanatory view of an example of a rotating mechanism used in the cutting tool of the present invention. An internal gear is provided on the bottom side of a U-shaped frame, and the drive shaft 15 uses the internal gear 101. do it,
By connecting to the shaft of the cutting blade, meshing the internal gear with the axial gear 102 (connected to the shaft of the rotary cutting blade) and engaging the teeth with the internal gear, and driving the handle, the slot coating layer is rotated in the same manner as the pencil sharpener. You can cut while.

Further, when the tool of the present invention is used, it is easy to cut an extremely thin layer thickness such as a termination detention portion of a protective detention of an internal cable. That is, FIG. 7 shows an example of cutting the cable surface of the attachment portion of the station internal cable to the termination protection case. In the station cable 30, the messenger wire 31 as a tension member is exposed at the center of the termination protection case 33. The sheath 32 of the cable made of polyethylene or polyvinyl chloride is tightly inserted into the protective case (closure) 33 for termination, but the thickness of the insertion portion (32a in the figure) is slightly reduced to 0.3 to 0. ．
By cutting 8 mm, the gap between the case and the cable can be inserted with a minimum gap, and the internal cable can be fixed more firmly. That is, the hole diameter of the case is made about the cable outer diameter +1 mm in consideration of the cable outer diameter fluctuation (tolerance), but it is formed by cutting the predetermined length 32a of the cable sheath 32 with the cutting tool of the present invention. The hole diameter of the end protection case itself should be made almost the same as the outer diameter of the cable, and the surface should be cut only when the cable does not enter, so the cable can be inserted and attached more airtightly. . The cutting tool itself can be understood from FIG.

[0012]

EFFECTS OF THE INVENTION In the terminal processing of a slot type multi-core optical cable having a tension member at the center, most of the slot coating (rod) of a required length is removed by rotary cutting teeth, and if necessary, a conventionally known tool is used together. The tension member can be exposed very easily, and even if the thickness is thick, it can be cut very easily without the effort and time required by the conventional technology, which makes the work more efficient and the finish is The surface can be finished extremely smooth, and even those with a small thickness and requiring precision can be easily thinly cut. Further, the surface of the rod-shaped body can be cut into various shapes by changing the mounting angle and shape of the rotary blade.

[Brief description of drawings]

FIG. 1 is a simplified perspective view for explaining a cutting tool and a cutting method according to the present invention.

FIG. 2 is a front view showing the relationship between the rotary cutting blade and the cable shown in FIG.

FIG. 3 is a side view of a cylindrical rotary cutting body.

FIG. 4 is a longitudinal sectional view showing a terminal structure of a slot-type multi-core optical cable cut by the present invention.

FIG. 5 is a front view showing a terminal structure of a slot-type multi-fiber optical cable that is completely stripped.

FIG. 6 is a perspective view of a gear mechanism used in the tool of the present invention.

FIG. 7 is a side view showing a state in which a mounting portion of a termination cable in a station is attached to a protective case.

FIG. 8 is an explanatory view of a stepped state of the end of the slot type optical cable according to the conventional method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Cable end part 11 Frame 11a Connecting part 12a Opening port 13 Bearing part 14 Rotating cutting blade 14a Rotating shaft 14b Cutting edge 15 Drive shaft 16 Handle 21 Tension member 22 Slot coating 22a Slot coating cutting part 221 Tapered 222 Thin residual coating layer 23 Slot 24 Optical fiber 25 Cable jacket 30 Intra-station cable 31 Messenger wire 32 Cable sheath 32a Predetermined length of cable sheath 33 Termination protection case 101 Internal gear 102 Connected to the axis of rotary cutting blade corresponding to internal gear Gears

Claims (5)

[Claims] 1. A cutting method using a rotary cutting blade having a plurality of cutting blades on its peripheral surface, wherein the surface of the rotary cutting blade is 45 ° to the axis of the cable end to be cut. 60
In such a manner as to be inclined, the cutting end of the cable end to be cut is brought into close contact, the rotary cutting blade is rotated around the end of the cable to be cut, and the rotary cutting blade is rotated as the cutting progresses. A method of cutting a cable terminal, which is characterized in that the cable is advanced to the surface of the cable to be processed and cut so that a predetermined length of a cutting portion at the end of the cable to be processed has a funnel-shaped appearance. 2. The method of cutting a cable end according to claim 1, wherein the rotary cutting blade is a cylindrical body having a spiral cutting blade on a surface thereof. 3. The method of cutting a cable terminal according to claim 1, wherein the rotary cutting blade has a spiral cutting blade on the surface and is a truncated cone having a small diameter on the tip side. 4. A frame body having a generally U-shaped cross section, the open end of which has an opening into which the end of the cable to be cut can be inserted, and the opposite surface of which has a U-shape. A rotary cutting blade is arranged on the inner side of the bottom so as to have a surface angle of a cutting edge of 45 ° to 60 ° with respect to the axis of the cable to be cut, and the rotary cutting blade is capable of rotating and has a peripheral surface of the cable to be cut end. A cutting tool for a cable end, characterized in that a drive shaft is rotatably supported so that it can be rotated. 5. A shaft gear connected to a shaft of a rotary cutting blade is meshed with an internal gear provided on an inner surface of a frame body, and the shaft gear of the rotary cutting blade is rotated along the internal gear by driving a drive shaft. A cutting tool for a cable end according to claim 4, wherein the cutting tool contacts the peripheral surface of the cable at a predetermined contact angle and rotates.