JP2791874B2 - Core dropping device for SZ grooved core - 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 of dropping an optical fiber core into an SZ grooved core , and more particularly to a method of dropping one or more optical fiber core wires in one groove .

[0002]

2. Description of the Related Art A method and an apparatus for dropping a so-called tape core wire in which a plurality of optical fiber wires are bundled in a tape shape in parallel into a unidirectionally wound groove are described with respect to a technique of dropping at one longitudinal position on a grooved core. Is, for example,
29087 "apparatus for manufacturing a slot type cable" groove when Kokoku 6-66006 are disclosed in detail as "ribbon collection device", and confused because of the large number of grooves or ribbon speed is likely to occur Regarding the technique of dropping at two places before and after along the core , for example, Japanese Patent Application No. Hei.
653 "Apparatus for manufacturing embedded optical fiber cable with multiple paragraphs" and the like.

A so-called loose-type optical fiber core, in which two or several optical fiber cores are loosely housed in a hollow cladding tube together with a jelly, instead of a tape-shaped tape core, is not a one-way-wound groove , but a S-shaped groove. As a technique of dropping the core into a so-called SZ- grooved core in which the winding and the Z winding grooves appear alternately in the longitudinal direction, a technique of dropping a single optical fiber core wire per groove is known.

[0004]

THE INVENTION Problems to be Solved] However for each groove as described above dropping a single book loose optical fiber technology is prior art, a plurality of loose optical fiber to each of the grooves The technology for dropping the core has not been developed so far, but the technology for dropping and guiding a plurality of loose-type optical fiber cores together by a core guide tube using at most one. Is only known. In this case, it is not possible to sufficiently cope with the increase in the number of drops.
As shown by (foul), the optical fiber cores 3 flooded at one time at the entrance of the groove 2 collide with each other, so that they do not fit neatly on the left side as shown by the symbol S (safe), and such cores There is a disadvantage that the transmission characteristics are impaired by receiving an impact force in the event of a collision between comrades.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the means according to the present invention for solving the above problem does not allow the grooved core to rotate. A grooved core sending section for sending out a required number of optical fiber cores , and a dropping section for dropping the optical fiber core into the groove of the grooved core ; Is rotatably driven by a drive motor, and a rotatable plate in which a branch hole of the optical fiber core wire is drilled at an angular position corresponding to the groove , provided downstream of the rotatable plate, and provided in a radial direction. A groove engaging claw that protrudes toward the groove and engages with the groove , and an upstream side drop guide plate provided with a guide hole for guiding the optical fiber core wire at an angular position corresponding to the groove ,
The coaxially and are relatively rotatably connected to the upstream side darken guide plate, and projects radially inwardly provided with a groove engaging claws engaged with the groove, and guided to the angular position corresponding to the guide hole A holding guide having a substantially hollow cylindrical shape, a coaxially fixed downstream side of the downstream drop guide plate, and a guide curved surface portion formed at the inlet inner peripheral portion. A cylinder, a coarse winding device provided immediately downstream of the downstream drop guide plate, and a rotation start and a rotation direction of the upstream drop guide plate are detected, and the rotatable plate is driven at a desired angle in the same direction. And a device for dropping a core wire into an SZ- grooved core .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION First of all, the present invention aims at having an SZ groove
Explain what a core drop is to the core . FIG. 6 shows an SZ grooved core 1 having a plurality of (six in the illustrated example) SZ grooves 2 on the outer peripheral portion of a synthetic resin molded rod-shaped grooved core 1 having a circular cross section. It was formed. The SZ groove is a helix-shaped groove, in which the S-directional groove 2A and the Z-directional groove 2B alternately and repeatedly appear. The neutral point P at which the winding is converted from S winding to Z winding or from Z winding to S winding appears at a certain interval (referred to as a pitch) in the longitudinal direction of the grooved core 1, and is usually about several hundred mm. In both the S-winding and the Z-winding, the length of a continuous groove in one winding direction is generally less than 300 degrees in angle. The code 1
A indicates a tension member for improving the tensile strength of the grooved core 1.

The technique of dropping the optical fiber 3 already described in the SZ groove 2 along the longitudinal direction thereof will be described later in this specification.

[0008] the whole of an embodiment apparatus of the present invention, there is shown in FIG. 2, reference numeral A ₁ is sending part of the grooved core 1, A
₂ delivery portion of the optical fiber 3, also A ₃ is dropped into portions to be now commentary, a portion surrounded by this one-dot chain line is shown enlarged in FIG.

In FIG. 1, the grooved core 1 is sent from the upstream side (right side in the figure) to the left, and a plurality of optical fiber cores 3 are also wrapped around the grooved core 1 for each groove. The required number of pieces are sent to the left in a running position that is angularly close to each groove . The angular position of each of the optical fiber cores 3 is determined by an optical fiber core passage hole (not shown) formed in a rotary plate 4 (which is movably provided so as to be adjustable in the longitudinal direction). Can be

The rotating board 4 is driven by an appropriate drive motor 9 such as an AC servomotor to form a timing belt 9.
1 can be driven to rotate. Although the rotation of the rotatable plate 4 will be described later, the amount of the rotation angle is limited, and the rotation is reset to return to the original position at a predetermined angular position.

The optical fiber core wire 3 is sent from the rotating plate 4 to the upstream drop guide plate 6 and then to the downstream drop guide plate 7 downstream therefrom, and is finally held down after passing through the downstream drop guide plate 7. S
It is dropped into the groove 2 of the core 1 with a Z groove . Reference numeral 10 denotes a coarse winding device, and a coarse winding yarn 101 is wound around the grooved core 1 in a crossing manner, and the optical fiber core wire 3 just dropped is held down and fixed in the groove .

FIG. 3 is an enlarged view of the upstream drop guide plate 6 and the downstream drop guide plate 7 of FIG. What hollow cylindrical indicated by reference numeral 5 is rotatably supported via an appropriate bearing in a by base guidance unit frame darken, and the guide plate 6 and the spur gear 51 darken upstream to the frame 5 Are coaxially fixed.

Reference numeral 7 denotes a downstream drop guide plate, which is rotatable with respect to the drop guide frame 5 and coaxial with the upstream drop guide plate 6 and is appropriately spaced axially therefrom. Attach it.

A spur gear 52 is meshed with a spur gear 51 coaxially fixed to the upstream drop guide plate 6.
The shaft of the spur gear 52 is, for example, a rotary encoder,
Alternatively, it is connected to an appropriate rotation detection sensor 11 such as a potentiometer.

Immediately downstream of the downstream drop guide plate 7, a substantially hollow cylindrical press-in introducing cylinder 8 is coaxially fixed immediately downstream. The hollow hole of the press-in introduction tube 8 allows the grooved core 1 to pass therethrough, and an introduction curved surface portion 81 having a radius of curvature of an appropriate size is formed at the entrance inner peripheral portion.

The upstream drop guide plate 6 and the downstream drop guide plate 7 are shown in FIGS. 4 and 5, respectively. In both cases, a hole through which the grooved core 1 passes is formed in the center, and extends radially inward from a peripheral edge of the hole, and a groove engagement for engaging with the SZ groove 2 of the grooved core. The claws 62 and 72 are provided isometrically. The number of such grooves engaging claw 62 may be one in principle, but a plurality thinking strength is desirable. With the engagement claws 62 and 72, the upstream drop guide plate 6 and the downstream drop guide plate 7 are rotated left and right as the grooved core 1 travels.

Guide holes 61 and 7 for guiding the passage of the optical fiber core wire 3 are provided at circumferentially equal positions corresponding to the respective grooves 2.
1 is drilled conformally. The number of guide holes depends on the groove used.
The number is the same as the number of the grooves 2 of the attached core 1, and the same number as the number of the optical fiber guide holes formed in the rotary eye plate 4. Regarding the drilling position, the guide hole 71 of the downstream drop guide plate 7 is used.
Is closer to the inside in the radial direction than the guide hole 61 of the drop-down guide plate 6 on the upstream side. That is, the optical fiber core wire 3 guided through these guide holes as approaching the downstream has a groove.
Approaching the groove 2 of the core 1.

The optical fiber core wire 3 dropped into the SZ groove 2 in this manner is guided by the introduction curved surface portion 81 of the press-in introduction tube 8 located immediately downstream of the downstream drop guide plate 7 while being guided by the groove 2. It is held inside.

Next, the meaning of driving of the drive motor 9 by the rotation detection sensor 11 and its detection signal (the rotation of the rotatable plate 4) will be described with reference to FIG. In FIG. 7, each of the optical fiber cores 3 is
Only two are drawn per groove .

The groove engaging claw 61 of the upstream drop guide plate 6
Right There When engaged with the S-winding groove 2A of the grooved core 1 as now Figure 7 illustrated, the guide plate 6 darken upstream progresses towards the left of the slotted core 1 as viewed from the upstream side Will be rotated around.

Now, for example, it is rotated by 180 degrees, so that the lower 6A portion of the upstream drop-in guide plate 6 becomes the upper 6A.
Suppose that it rotates to the position of B. As a result, the optical fiber core wire 3 is twisted by 180 degrees with the rotary board 4 as shown by a broken line as shown in the figure. Actually, each groove 2 includes a large number of optical fiber cores 3, and in the case of S winding, 300 grooves of the same direction winding of S winding are used.
Since this twist lasts for a long time, an elastic rotating force that rotates the dropping guide plate 6 on the upstream side from the optical fiber core wire 3 to the left and returns it to the original state during the torsion greatly acts. become.

This force actually acts as a shearing force between the groove engaging claw 61 of the upstream drop-in guide plate 6 and the SZ groove 2. Therefore, it is preferable to make this shear force zero or reduce it. For this, the rotating eye plate 4
Can be rotated in the same direction as the dropping guide plate 6 on the upstream side. Also, if the rotation is made by the same angle, the above-mentioned force becomes zero, and it can be seen that even if the same amount of angle is not reached, this shearing force is effectively reduced.

[0023]

According to the present invention, the drop guide plate is driven to rotate left and right while the SZ groove advances, and the rear turning plate is dropped to follow and rotate in the same direction as the rotation direction of the guide plate. Therefore, the amount of entanglement in which the optical fiber core wire between the drop guide plate and the rotating eye plate is entangled alternately left and right around the grooved core can be reduced to zero or reduced. This has the effect of reducing the shear stress applied to the groove engaging claw of the guide plate.

The dropped optical fiber core 3
Immediately after being held down by the hold-down introducing tube 8 so as not to escape into the groove , the optical fiber core wire 3 is reliably and stably arranged in the groove because it is held down by the coarse winding thread 101 of the coarse winding device 10. There are advantages that can be. In this case, there is also an effect that the action of the introduction curved surface portion 81 of the press-in introduction tube 8 does not damage the optical fiber core wire 3 or receive an external force that impairs its transmission characteristics.

As is obvious from the above description, the device of the present invention is a device which drops the optical fiber core 3 naturally without forcibly driving the optical fiber core 3 electrically or mechanically. There are advantages such as no production, high productivity, and relatively low production cost.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an example of an apparatus for carrying out a method of the present invention.

FIG. 2 is a side view showing the entire optical cable manufacturing apparatus using the apparatus of the present invention.

FIG. 3 is an enlarged side sectional view illustrating a drop guide plate.

FIG. 4 is a plan view of an upstream drop guide plate.

FIG. 5 is a plan view of a downstream drop guide plate.

FIG. 6 is a side view illustrating an SZ grooved core and dropping of an optical fiber core wire into the groove .

FIG. 7 is a side view illustrating the entanglement of the optical fiber according to the rotation of the drop guide plate.

8 is a cross-sectional view of a groove illustrating a disadvantage when dropped a plurality of optical fibers in one groove.

[Explanation of symbols]

1 Core with groove 1A Tension member 2 SZ groove 2A S winding groove 2B Z winding groove 3 Optical fiber core wire 4 Rotating board 5 Drop-in guide frame 51, 52 Spur gear 6 Upstream drop-in guide plate 61 Core wire guide hole 62 groove the engaging claw 7 downstream darken guide plate 71 core wire guide hole 72 groove engaging pawl 8 presser narrowing the introduction tube 81 introducing the curved portion 9 drives the motor 10 coarse winding device 11 rotation detecting sensor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-308111 (JP, A) JP-A-2-19105 (JP, U) (58) Fields investigated (Int.Cl. ⁶ , DB name) G02B 6/44 391

Claims (1)

(57) [Claims] (1)Grooved coreDo not give (1) rotation
Send out toGrooved coreSending section, required number of optical fibers
Optical fiber core sending section for sending core (3) and said light
Fiber coreGrooved core(1)groove(2) fall into
A dropping portion for dropping, wherein the dropping portion is rotated by a drive motor (9).
Moved, saidgrooveThe optical fiber is positioned at an angular position corresponding to (2).
Rotating board (4) with branch holes for fiber core wire (3)
Provided downstream of the rotatable plate (4) and radially inward.
Protruding saidgroove(2) at least onegroovePerson in charge
Comprising a dowel (62), andgrooveAngle corresponding to (2)
Guides the optical fiber cores (3) to respective positions
An upstream drop-in guide plate with a guide hole (61)
(6) and coaxially and relative to the upstream drop guide plate (6).
Rotatably connected and projecting radially inwardgroove
(2) at least onegrooveEngagement pawl (72)
Comprising and saidgrooveGuide holes at angular positions corresponding to (2)
(71) Perforated downstream drop guide plate (7)
A substantially hollow cylindrical shape, and the downstream side drop guide plate.
Coaxially fixed downstream of (7) and introduced into the inner periphery of the inlet
Press-in introduction cylinder (8) with curved surface (81)
And a coarse provided immediately downstream of the press-in introduction cylinder (8).
Winding start and turn of the winding device (10) and the upstream drop guide plate (6)
The turning direction is detected, and the turning plate (4) is moved in the same direction.
And a device (9, 11) for rotating the lens by a desired angle.And
The guide hole (71) on the downstream side is connected to the guide hole (6) on the upstream side.
1) Be closer to the inside in the radial directionCharacteristic S
ZGrooved coreA device for dropping the core wire into