JPH0540487Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an apparatus for manufacturing a tape-type optical fiber cable, in which a plurality of tape-type optical fiber core wires are overlapped and fitted into an outer peripheral spiral slot of a long central shaft. .

(Prior Art) First, to briefly explain the general structure of a tape-type optical fiber cable, as shown in FIG. A steel tension strand 2 is built into the part.

A plurality of tape-type optical fiber core wires T are superimposed and fitted into some of the plurality of slots 4,
The other slots 4 house various conduction (or transmission) elongated members such as gas tubes or electric wires. The tape-type optical fiber core wire slot 4 has a generally rectangular cross-sectional shape.
After the various members described above are fitted onto the outer periphery of the central shaft 1, various protective tapes (not shown) are coated on the outer periphery of the central shaft 1, thereby finally fixing the tape-type optical fiber core wire T and the like.

As shown in FIG. 5, the tape-type optical fiber core wire T incorporates a plurality of parallel optical fiber core wires 5, and the outer periphery of the optical fiber core wire 5 is coated with a resin coating layer 6.
It is integrally covered with. The cross-sectional shape of the tape-type optical fiber core wire T has a pair of parallel long sides, and both ends of the long sides are connected by, for example, an arc-shaped short side, so that the cross-sectional shape resembles that of a racing track. The width of the tape-type optical fiber core wire is approximately 1.1mm,
The thickness is approximately 0.4mm.

When fitting the tape-type optical fiber core wire T as described above into the slot 4 as shown in FIG. It may become twisted inside or protrude from the slot 4, making it impossible to fit it into a stable state.

In the conventional device, as shown in FIG. 7, in order to stably fit the tape-type optical fiber core wire T into the slot 4, a presser pin 33 and a spring 34 are installed at the front end (exit side end) of the die 10. In preparation, the pin 33 is pressed against the slot 4 side by the spring 34,
The tape-type optical fiber core wire T is pressed into the slot 4 by the tip of the pin 33. However, when the tape type optical fiber core wire T is pressed down with pin 33,
3, the tape-type optical fiber core wire T may be rubbed tightly, resulting in scratches on the surface of the tape-type optical fiber core wire T, distortion of the tape-type optical fiber core wire T, or heating of the tape-type optical fiber core wire T due to frictional heat. . These phenomena cause deterioration of transmission characteristics after being made into a cable.

(Purpose of the invention) The purpose of the invention is to enable a tape-type optical fiber core wire to be smoothly and reliably pressed into a slot without causing damage or distortion to the tape-type optical fiber core wire.

(Means for Achieving the Object) In order to achieve the above object, the present invention provides an annular twisting die through which the central axis passes while rotating at a speed that advances one lead per rotation, and the present invention rotates around the central axis. The twisting die is freely supported in a holder, and the twisting die is provided with a support rod movable in the radial direction, and a rotary disk is rotatably provided at the tip of the support rod, and the outer peripheral end of the disk is fitted into the slot by a biasing means. A plurality of tape-type optical fiber core wires dropped into the slot are held down into the slot by a rotating disk.

(Function) The rotating disk fitted in the slot holds the multiple ribbon-type optical fiber cores after they are inserted.
The ribbon-type optical fiber core is pressed into the slot while rotating as it moves.

(Example) Fig. 1 shows a vertical cross section of a die of a tape type optical fiber cable manufacturing device to which the present invention is applied, and the central shaft 1 made of resin is twisted in the same direction on its outer peripheral surface as described above. It has a plurality of spiral slots 4, and is sent forward at a predetermined speed while rotating in the same direction (R direction) as the twisting direction of the slots 4.
The above-mentioned predetermined speed is the speed at which the slot 4 advances by one lead during one revolution of the central shaft 1, and therefore, the slot 4 always passes through each of the fixed points P1, P2, etc., for example.

The twisting die 10 is formed into a cylindrical shape coaxial with the central axis 1, and its outer peripheral surface is rotatably supported by a holder 13 via a bearing 11.

The rear end (entrance side end) 10a of the die 10 is provided with a support hole 1 extending in the radial direction, as shown in FIG.
5 is formed, and a support rod 16 is inserted into the support hole 15 so as to be movable in the radial direction. A support shaft 26 that is substantially perpendicular to the support rod 16 is fixed to the radially inner end of the support rod 16, and a rotary disk 18 is rotatably supported on the support shaft 26 via a bearing. The rotary disk 18 is made of aluminum, for example, and fits into the slot 4 for the tape-type optical fiber core. The outer end of the support rod 16 in the radial direction projects outward from the die 10, and is actuated by a coil spring (biasing means) 20 compressed between the outer end of the support rod 16 in the radial direction and the spring receiving bracket 21. , are biased radially inward. Bracket 21 is fixed to die 10. A radially long elongated hole 23 is formed in the middle of the support rod 16. A regulating pin 22 is inserted into the elongated hole 22, and the regulating pin 22 limits the range of movement of the support rod 16 in the radial direction. It is regulated. The pin 22 is fixed to the die 10.

In FIG. 3, which shows the - cross-section of FIG. It is sloping.

The rotary disks 18 are arranged in the same number as the slots 4 for tape-type optical fiber cores on the central shaft 1, and are arranged in the same phase (circumferential interval) as the slots 4. For example, total 8
When attaching a tape-type optical fiber core wire T, two slots 4 out of the plurality of slots 4 are used.
is used for the tape-type optical fiber core wire, and therefore two rotary disks 18 are arranged.

Explain the operation. In FIG. 1, for example, eight tape-shaped optical fiber cores T are sent forward from a rear core wire supply device (not shown), and along the way, they are arranged so that four fibers are stacked one on top of the other by guide rollers, etc., and each tape-shaped optical fiber Core wire slot 4
It is dropped into. Immediately after being dropped, it is pressed into the slot 4 by the rotating disk 18,
sent forward. At this time, since the rotating disk 18 is in contact with the tape-type optical fiber core wire T, it follows this and rotates the tape-type optical fiber core wire T.
Therefore, the tape-type optical fiber core wire T and the rotating disk 18 do not rub against each other.

Since the feed rate of the central shaft 1 is maintained at a constant speed as mentioned above, in principle, the feed rate of the rotating disk 1 is
8 has almost no change in the positions of P1 and P2,
Perform holding down work.

However, in reality, there is some manufacturing error in the pitch of the slot 4, so even if the feed is carried out at a constant speed, the slot 4 may deviate from the points P1 and P2 midway. On the other hand, since the die 10 itself is rotatable and the rotating disk 18 is fitted into the slot 4, the rotating disk 18 follows the slot 4 and rotates together with the die 10 around the central axis. move. Therefore, there is no fear that the rotary disk 18 will come out of the slot.

(Another embodiment) (1) For example, the rear end 10a of the die that supports the support rod 16 in FIG. However, this also makes it possible to arbitrarily select the axial position of the rotary disk 18. According to this, the position pressed by the rotary disk 18 can be easily adjusted without moving the die 10 itself.

(2) Figure 6 shows an example in which the support rod 16 is of a swing arm type. That is, a swing arm type support rod 16 is rotatably supported at the front end of the die so as to extend forward and downward, and a coil spring 30 stretched between the die 10 and the support rod 16 supports the rotary disk 1.
8 toward the central axis. In this case as well, the rotary disk 18 is inclined with respect to the central axis 1 so as to coincide with the length direction of the slot 4 as shown in FIG.

(3) The rotating disk can also be made of ceramic in addition to aluminum.

(4) In the illustrated embodiment, two rotary disks 18 are provided, but the rotary disks 18 are
is provided. Of course, the device of the present invention can also be applied to the case where two, three, or five or more tape-type optical fiber core wires are fitted into one slot 4.

(Effects of the invention) As explained above, according to the manufacturing apparatus of the invention, a plurality of tape-shaped optical fiber core wires T dropped into the spiral slot 4 of the central axis 1 are Since the tape-type optical fiber core wire T and the rotating disk 18 are pressed down by the disk 18 rotating along the width direction, there is almost no possibility that the tape-type optical fiber core wire T and the rotating disk 18 rub against each other. Therefore, the surface of the tape-type optical fiber core T is not scratched or distorted during pressing, and the tape-type optical fiber can be stably inserted into the slot 4, resulting in a tape-type optical fiber with good transmission performance. Cables can be manufactured.

Furthermore, since the tape-type optical fiber core wire T and the rotary disk 18 do not rub against each other, there is no fear that the rotary disk 18 will be heated, and distortion of the tape-type optical fiber core wire T due to heat can be prevented.

Furthermore, since the rotary disk 18 is rotatable around the central axis together with the die 10, even if there is an error in the pitch of the slot 4, the rotary disk follows the slot 4 and rotates around the central axis. There is no need to worry about 18 coming out of slot 4.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the die portion of a tape-type optical fiber cable manufacturing apparatus to which the present invention is applied, Figure 2 is an enlarged cross-sectional view of Figure 1, and Figure 3 is a cross-sectional view of the
4 is an enlarged longitudinal section of a tape-type optical fiber cable, FIG. 5 is an enlarged longitudinal section of a tape-type optical fiber core, and FIG. 6 is a partial longitudinal section of another embodiment. , FIG. 7 is a longitudinal sectional view of a conventional example. T... Tape type optical fiber core wire, 1... Center shaft, 4... Slot, 16... Support rod, 18...
Rotating disk, 20... coil spring (an example of biasing means).

Claims (1)

[Scope of utility model registration request] In a manufacturing device for a tape-type optical fiber cable, in which a plurality of tape-type optical fiber core wires are overlapped and fitted into an outer peripheral spiral slot of a long central shaft,
An annular twisting die through which a central axis passes while rotating at a speed of one lead per revolution is supported in a holder so as to be rotatable about the central axis, and the twisting die is provided with a support rod movable in the radial direction. , a rotary disk is rotatably provided at the tip of the support rod, and the outer peripheral end of the disk is fitted into the slot by a biasing means,
A manufacturing device for a tape-type optical fiber cable, characterized in that a plurality of tape-type optical fiber core wires dropped into a slot are pressed into the slot by a rotating disk.