JP3279975B2 - Method and apparatus for manufacturing cable with aerial terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a cable with an aerial terminal.

[0002]

2. Description of the Related Art A cable with an aerial terminal (self-supporting cable) is formed by covering a cable core and a supporting wire with a sheath having a neck. However, the conventional method of manufacturing a cable with an aerial terminal is to apply a tension within the elastic limit to the support wire, extrude the cable core at a time with a predetermined strain, and give the cable core an extra length by releasing the tension. (Pretension method).

[0003]

However, in the pretensioning method described above, it is necessary to apply an excessive tension to the support wire, so that the entire manufacturing apparatus becomes large and the amount of core twisting is determined by the support wire load tension. Therefore, there is a possibility that the core twist amount may fluctuate due to fluctuations in the support wire tension.

Accordingly, an object of the present invention is to provide a method and an apparatus for manufacturing a cable with an aerial terminal, which can ensure a constant core twist amount and can manufacture a high-quality product. I do.

[0005]

Means for Solving the Problems To achieve the above object, a method for manufacturing a cable with an aerial talmi according to the present invention comprises:
A support wire is wound around the first drum of a differential capstan in which a first drum and a second drum having a diameter larger than the diameter of the first drum are arranged on the same axis, and a cable is wound around the second drum. A core is wound and the drum runs from the first drum via a moving roller.
The tension of the supporting line to be moved is changed by the position change of the moving roller.
Detecting and controlling the rotation speed of the diameter difference type capstan in accordance with the tension, pulling the support wire at a constant tension, and crossing the cable core by a predetermined amount of twist with respect to the support wire to the crosshead. And a common covering of the cable core and the support wire with a sheath having a neck portion.

[0006] Further, according to the present invention, there is provided an apparatus for manufacturing an aerial cable with an aerial terminal, wherein a cable core and a supporting line are commonly covered with a sheath having a neck portion. A diameter difference type capstan in which one drum and a cable core are wound and a second drum having a diameter larger than the diameter of the first drum is arranged on the same axis is provided on the upstream side of the crosshead. The support between the cap head and the crosshead
It has a moving roller that detects the tension of the cantilever by position change.
An adjusting mechanism for controlling the rotation speed of the diameter-difference-type capstan according to the issued tension and causing the support wire to be drawn at a constant tension;
A core pushing machine for supplying the cable core to the crosshead without loosening the cable core; and a correction means for preventing a curved deformation of the neck at the downstream side of the crosshead.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 3 show an apparatus for manufacturing a cable with an imaginary terminal according to the present invention. This apparatus extrudes a cable with an imaginary terminal (see FIG. 4 and the like), and comprises a core supply machine. 6, a support line supply machine 7,
Crosshead 11 and first drum 8 around which support wire 3 is wound
And a second drum 9 around which the cable core 2 is wound. The capstan 10 includes a core pushing machine 12, a straightening means 13 for preventing the cable 1 from being bent, and the like.

Thus, the cable 1 with an imaginary terminal is
As shown in FIG. 4, the cable core 2 and the support wire 3 are
It is commonly covered with the above-mentioned integral sheath 5 having a neck 4. That is, the support wire 3 is made of, for example, a metal stranded wire such as a galvanized steel stranded wire or a non-metallic wire such as an aromatic polyamide fiber or FRP, and is made of polyethylene, adhesive polyolefin,
It is directly covered with a primary coating layer 14 such as a twist-resistant polyethylene or polyvinyl chloride. The material of the sheath 5 is a synthetic resin such as polyethylene or polyvinyl chloride. It is preferable to select a material that allows the sheath 5 and the coating layer 14 to be integrated with each other, and the same material may be used. Also, the primary coating layer 14 is omitted, and the sheath 5
May be applied.

The cable core 2 comprises a core body 16 having a plurality of holding grooves 15 on its outer periphery,
A tension member 17 made of a single-core or stranded steel wire inserted into the center hole of 16, an optical fiber 18 such as an optical tape housed in the holding groove 15 and an interposed pair 19 are exemplified. However, of course, the present invention is not limited to this. In addition,
Reference numeral 20 denotes a holding roll, on which the sheath 5 is covered.

As shown in FIG. 4, a pair of circular holes 23 and 24 are formed in the nipple and die 21 of the crosshead 11 by a pair of circular holes 23 and 24. That is, the coating layer 14 is integrally coated (or the coating layer 14
Through the nipple of the crosshead 11 and the circular hole 23 around the center of the die 21 (that is, the running axis O), and simultaneously through the cable core 2 to the circular hole 24 eccentric from the axis O. The sheath 5 formed by extruding the resin into the slit hole 22 and the circular holes 23 and 24 forms a support wire 3.
And the cable core 2 are commonly covered via a neck 4.

As shown in FIG. 1, the core supply unit 6 includes a stand (not shown) and a drum 6a rotatably supported by the stand. The cable core 2 is wound around the drum 6a. You. The support wire supply device 7 includes a stand (not shown) and a drum 7a rotatably supported by the stand, and the support wire 3 is wound around the drum 7a.

Thus, the diameter difference type capstan 10 includes the first drum 8 and the second drum 9 having a diameter larger than that of the first drum 8.
Are integrally coaxially driven by a driving means 26 (see FIG. 2) having a motor, a speed reducer, and the like. The diameter D ₂ of diameter D ₁ and the second drum 9 in the first drum 8
Means that a difference in diameter is provided so that a predetermined twist amount with respect to the support wire 3 is added to the cable core 2. That is,
The twisting ratio is represented by (D ₂ −D ₁ ) / D ₁ × 100 (%). The twisting rate is 0.2% to 0.5%, preferably 0.3%.

The diameter difference type capstan 10 has a first drum 8
A first non-slip mechanism 27 that does not cause a slip between the support member 3 and the support wire 3; and a second anti-slip mechanism 28 that does not cause a slip between the second drum 9 and the cable core 2.

The first non-slip mechanism 27 includes three rollers 30... Disposed at the apexes of a triangle, and a belt 31 looped around the rollers 30. The first
Press against the drum 8 to prevent the support wire 3 from slipping,
The non-slip mechanism 28 includes five rollers 32.
The belt 33 presses the cable core 2 toward the second drum 9, and the belt 33
Prevent slippage. The pressing force is such that one of the rollers 30 and 32 is moved by an air cylinder (FIG. 1).
The pressure is adjusted by adjusting the air pressure applied to the air cylinder.

The core pusher 12 for pushing the cable core 2 into the crosshead 11 has a caterpillar 35 for feeding the cable core 2 while holding the cable core 2 therebetween. The caterpillar 35 includes a pair of rollers 36, 36 and a belt wrapped around the rollers 36, 36.
And a second holding member 41 having a pair of rollers 39, 39 and a belt 40 wound around the rollers 39, 39.

That is, the cable core 2 is held between the first and second holding members 38 and 41, and the rollers 36, 36, 39 and 39 are driven by a motor (not shown) to rotate the belts 37 and 41.
By moving the cable core 40, the cable core 2 can be moved toward the crosshead 11, so that the cable core 2 does not slack between the capstan 10 and the crosshead 11. If the motor of the core pushing machine 12 is of a drive type based on torque control, the pushing force can be adjusted, and only the extra length can be pushed securely. Also,
A guide member 42 made of a pipe material or the like is provided downstream of the core pushing machine 12. The cable core 2 is guided by passing through the guide member 42 and enters the crosshead 11.
That is, the guide member 42 is provided from the vicinity of the exit of the core pushing machine 12 to the vicinity of the extrusion die of the crosshead 11, so that the cable core 2 does not buckle until the cable core 2 is covered collectively. Guide to

Thus, the capstan 10 and the crosshead
An adjustment mechanism 45 for adjusting the rotation speed of the capstan 10 is provided between the capstan 10 and the cap 11. The adjustment mechanism 45 is a roller group
The roller group 44 includes a pair of constant rollers 46, 46 disposed at predetermined intervals, and a moving roller 47 disposed between the constant rollers 46, 46 and capable of moving up and down. Specifically, each of the constant rollers 46, 46 is rotatably supported by a shaft member disposed at the same height in parallel at a constant interval, and each shaft member is held by a fixed member (not shown). The moving roller 47 can be moved up and down between the fixed rollers 46 by a cylinder mechanism, for example.

As shown in FIG. 2, the adjusting mechanism 45 includes a position detector 48 including a sensor for detecting the vertical position of the moving roller 47 and a data detected by the position detector 48. Control means 49 for controlling the driving means 26 of the capstan 10 based on the control signal to control the rotation speed of the capstan 10.

The core supply machine 6 and the capstan
A measuring instrument that detects the amount of cable core 2 sent out between 10.
51 is provided, the support wire supply machine 7 and the capstan 10
A measuring instrument 52 for detecting the amount of the support wire 3 sent out is provided. In addition, on the upstream side of the crosshead 11,
A guide roller 70 is provided to guide the roller.

Next, the correcting means 13 disposed downstream of the crosshead 11 includes a plurality (for example, 5 to 10) of roller pairs 54 disposed in the water tank 53. As shown in FIG. 3, the roller pair group 54 includes a pair of rollers 55, 56 rotatably fitted to a pair of shaft members 59, 59 via bearings. The first and second
Concave peripheral grooves 57 and 58 are provided. That is, the first of the rollers 55 and 56
A first passage 61 having a circular cross section is formed by the concave peripheral grooves 57, 57,
The second concave circumferential grooves 58, 58 of the rollers 55, 56 have a second circular cross section.
A passage 62 is formed, and a slit-shaped third passage 63 is formed between the first passage 61 and the second passage 62.

That is, the cable 1 extruded from the crosshead 11 has a support wire covering portion 64 for covering the support wire 3.
A core covering portion that passes through the passage 61 and covers the cable core 2
65 passes through the second passage 62, and the neck 4 passes through the third passage 63.

In this case, the roller pair group 54, other than the most upstream roller pair group 54, is swingable about the axis O. That is, the swingable roller pair group 54 is held by a roller holding member 67, and the roller holding member 67 is fixed to a rotating plate (not shown), and the rotating plate is rotatably held by a fixed member (not shown). Is done. In the roller pair group 54 that does not swing, the roller holder 67 is not fixed to the rotating plate, but is fixed to a fixing member.

By the way, in this case, the crosshead 11
A window portion is formed at a predetermined pitch in a neck portion 4 of the formed cable 1, and the distance between the centers of the support wires 3 is increased from the cable core 2 in the free state due to the extra core length of the cable 1 extruded at a time. Directional force works. Therefore, the shape of the cable 1 is adjusted until the resin is cooled and solidified by the above-described correcting means 13. Of course, the crosshead 11 may be of a type without a window.

In order to make the neck 4 exist on the same plane on the cable 1, some of the roller pairs 54 may be forcibly inverted synchronously. In this case, no twisting force is applied to the support wire 3, and the deformation of the neck 4 can be suppressed.

Next, a description will be given of a method of manufacturing the cable 1 with an aerial terminal using the manufacturing apparatus configured as described above.
The cable core 2 of the core supply machine 6 is wound around the second drum 9 of the capstan 10 via the measuring instrument 51, and furthermore, the crosshead 11 is wound from the second drum 9 via the core pushing machine 12.
Through. Also, the support line 3 of the support line supply machine 7 is used.
Is wound around the first drum 8 of the capstan 10 via the measuring instrument 52, and further passes from the first drum 8 through the crosshead 11 via the rollers 46, 47, 46 of the roller group 44 of the adjusting mechanism 45. Let it. At this time, the cable core 2 and the support wire 3 are respectively drawn out from the supplies 6 and 7 with a tension that does not loosen.

In the crosshead 11, the cable 1 is formed by covering the cable core 2 and the support wire 3 with resin, and covering the cable core 2 and the support wire 3 in common with the sheath 5 having the neck 4. Is formed, and the formed cable 1 is wound by a winding machine (not shown) provided on the downstream side of the correcting means 13.

At this time, the vertical position of the moving roller 47 of the roller group 44 is detected by a position detector 48, and the detected value is used as control means.
The rotational speed of the capstan 10 is changed by controlling the driving means 26 based on the detected value, whereby the support wire 3 is always taken with a constant tension (for example, 40 kgf). Further, the core pushing machine 12 always supplies an extra length between the capstan 10 and the crosshead 11 so that the cable core 2 does not loosen. In addition, the crosshead
The cable 1 extruded from 11 passes through the straightening means 13 until the resin is cooled and solidified.
The shape of the cable 1 is adjusted, and a winding machine (not shown) sequentially winds the cable 1 having a stable shape. Further, the cable cores 2 and the support wires 3 are respectively sent out from the capstan 10 in a stable state by the first and second non-slip mechanisms 27 and 28 provided on the capstan 10, and are fixed to a predetermined position with respect to the support wires 3. The amount of twist is added to the cable core 2.

Accordingly, a high-precision cable 1 can be formed while securing a constant core twist amount, and the entire apparatus can be made compact.

[0030]

Since the present invention is configured as described above, the following effects can be obtained.

According to the method of manufacturing an aerial cable with an aluminium according to the first aspect, a constant core twist amount can be stably secured, so that a high quality product can be manufactured.

[0032] According to the cable manufacturing apparatus with an aerial terminal, it is possible to stably secure a constant core twist amount, and the resin is solidified immediately after being extruded from the crosshead 11. In the meantime, the shape of the cable can be maintained in the regular shape by the correction means 13,
Higher quality cables can be supplied stably. In addition, the entire device can be made compact,
In addition, this device can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a simplified diagram of an apparatus for manufacturing a cable with an aerial terminal according to the present invention.

FIG. 2 is a block diagram.

FIG. 3 is a sectional view of a main part.

FIG. 4 is a cross-sectional view of an aerial cable with a terminal.

[Explanation of symbols]

 2 Cable Core 3 Support Wire 4 Neck 5 Sheath 8 First Drum 9 Second Drum 10 Diameter Capstan 11 Crosshead 12 Core Pushing Machine 13 Straightening Means 45 Adjusting Mechanism

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Itsuro Kasobo 8 Nishinocho, Higashimukaijima, Amagasaki City, Hyogo Prefecture Inside Mitsubishi Cable Industries, Ltd. (72) Inventor Takashi Kaneko 4-3 Ikejiri, Itami City, Hyogo Prefecture Mitsubishi Electric Wire Industry Inside Itami Works (72) Inventor Haruo Oizumi 4-chome Ikejiri, Itami-shi, Hyogo Mitsubishi Electric Wire Industry Co., Ltd.Itami Works Co., Ltd. (72) Inventor Koji Tsuji 4-3-1 Ikejiri, Itami-shi, Hyogo Mitsubishi Electric Wire Industry (56) References JP-A-6-148485 (JP, A) JP-A-6-94952 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 13 / 22-13/26 G02B 6/44

Claims (2)

(57) [Claims] 1. A support wire is wound around a first drum of a differential-diameter capstan in which a first drum and a second drum having a diameter larger than the diameter of the first drum are arranged on the same axis. A cable core is wound around the second drum, and the moving drum is moved from the first drum.
The tension of the support wire traveling through the roller is
The support wire while controlling the rotational speed of the該径difference formula capstan in accordance with the detected the tension by positional changes take back at a constant tension by an amount amount narrowing predetermined twisting relative to the support line number the cable core And supplying the cable core and the support wire with a sheath having a neck portion. 2. A manufacturing apparatus for manufacturing an aerial cable with an aluminium in which a cable core and a support wire are commonly covered by a sheath having a neck, wherein the first drum around which the support wire is wound and the cable core are wound. A differential capstan, in which a second drum having a diameter larger than the diameter of one drum is disposed on the same axis, is provided on the upstream side of the crosshead, and is provided between the differential capstan and the crosshead. The above support
It has a moving roller that detects the tension of the cantilever by position change.
An adjusting mechanism for controlling the rotation speed of the diameter-difference-type capstan according to the issued tension and causing the support wire to be drawn at a constant tension;
A core pushing machine that supplies the cable core to the crosshead without loosening the cable core, and a straightening unit that prevents the neck from being bent and deformed is provided downstream of the crosshead. Cable manufacturing equipment with fictitious terminal.