JPS63223604A - Device for taking up optical fiber cable - Google Patents

Abstract

PURPOSE:To permit taking up and delivery of an optical fiber cable without twisting the cable by driving feed sheaves by means of gears which engage with an internal gear mounted on the inside of an inside cylinder and rotates while revolving. CONSTITUTION:The feed sheaves 5, 8 are revolved along the inside cylinder 2 while being rotated in the direction backward from the rotating direction of an arm 4 by the engagement of the internally toothed gear 3 with gears 6, 9 when the arm 4 rotates in the case of a taking up. The cable 20 is fed from the lower side in the central part of the device along the feed sheaves 5 and 8 via the inside of a hollow revolving shaft 19 and a guide part 21 and is wound on the outside of the inside cylinder 2. The cable 20 is delivered by the same friction force as in the case of the taking up but since the respective feed sheaves rotate in the direction backward from the direction in the case of the taking-up, the cable passes the inside of the revolving shaft 19 and emerges from the lower side in the central part of the device. The bends and twists of the cable are thereby decreased and the easy taking up or delivery of the optical fiber cable is permitted without using an optical rotary connector or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical fiber cable winding device. In particular, the present invention relates to a winding device suitable for winding optical fiber cables used underwater.

(Prior Art) As a winding device for optical fiber cables and electric wires, there is a cable winding device that uses a drum, such as a winch used on land.

In this winding device, when one end of the cable a passes through the axis C of the drum b and is connected to a device installed outside the drum as shown in Fig. 3, when the drum b rotates, the end of the cable is fixed. A relative rotational movement occurs between part a and the rotating part 82 wound on the drum, causing twisting of cable a.

In order to avoid this twisting, it is necessary to provide a slip ring at the joint with the rotating part a2. In the case of optical fiber cables, an optical rotary connector d is used as the slip ring, but there is currently no product that can be used in a flooded state. Therefore, the drum-type winding device is limited by the number of component parts, and it is difficult to realize it as a device.Therefore, the emergence of an optical fiber cable winding device that does not require an optical rotary connector or a drum is desired. .

(Problem to be solved by the invention) In view of the problems of the prior art, it is possible to wind up or send out optical fiber cables underwater without using optical rotary connectors or rotating drums, and without twisting as much as possible. The purpose of this invention is to provide a winding device.

(Solving Means by the Invention) An optical fiber cable storage part is constituted by an outer cylinder with a bottom and an inner cylinder, and has a plurality of rollers at the tips that rotate on the inner cylinder and the outer cylinder, and a hollow drive shaft in the center. a pair of large-diameter feed sheaves rotatably attached to the arm, and a small-diameter feed sheave rotatably attached to the arm and closely attached to the pair of large-diameter feed sheaves, respectively. It is composed of a feed sheave, a drive mechanism for the hollow drive shaft of the arm, and a rotation drive mechanism for the large diameter feed sheave, and the optical fiber cable is brought out from below the hollow shaft upward;
After passing through a set of large-diameter sheaves and small-diameter sheaves and being wound around an inner cylinder, they were taken out from the bottom and the respective ends were connected to upstream and downstream working machines, etc.

The rotational drive mechanism of the large-diameter feed sheave is a combination of an internal gear provided on the inner surface of the inner cylinder and a coaxial gear provided on the lower part of the large-diameter feed sheave that meshes with the internal gear, or It is constructed by a combination of a guide chain installed at the top and a sprocket installed at the bottom of the large diameter feed sheave.

(Example) This will be explained based on the drawings. 1 is a bottomed outer cylinder that constitutes a housing part for an optical fiber cable (hereinafter referred to as a cable); 2
is also the inner cylinder. The cable 20 is wound around the outside of this inner cylinder 2. A six-legged arm 4 whose rotation center is the center of the inner cylinder 2 is provided at the upper part of the inner cylinder 2. The arm 4 has four long arms 4a, 4b, 4c, and 4d and short arms 4e and 4f, and the long arms 4b and 4d have short arms 4e and 4f, and a frame 4g, respectively.

They are joined together by 4h. Large diameter feed sheaves 5 and 8 feed the cable 20 to the lower part of the frame 4g between the long arm 4b and the short arm 48 and the lower part of the frame 4h between the long arm 4d and the short arm 4f, and also to the short arm 4e. Small-diameter feed sheaves 7 and 10 are attached to the lower part of the tip of 4f, and the feed sheaves 5 and 7 and 8 and 10 form pairs, respectively.

Gears 6 and 9 are coaxially attached to the lower portions of the feed sheaves 5 and 8, respectively, and these gears mesh with an internal gear 3 located inside the inner cylinder 2. Therefore, when the arm 4 rotates, the two-feed receivers 5 and 8 rotate in the opposite direction to the rotation direction of the arm 4 due to the meshing of the gear 6.9 and the internal gear 3, and then revolve along the inner cylinder 2. Although the rotational drive mechanism of the large-diameter feed sheave is composed of an internal gear and a gear that meshes with the internal gear, a guide chain (not shown) is provided along the inside of the inner cylinder 2 instead of the internal gear 3, and Instead of the gears 6 and 9, a sprocket that meshes with the guide chain may be provided.

The feed sheaves 5 and 7 and 8 and 10 are in close contact with each other and rotate in opposite directions. Long arm 4a.

Rollers 11, 12, 1 are provided at the tips of 4b, 4c, and 4d, respectively.
3.14 is attached, and rotates while contacting the upper parts of the outer cylinder 1 and the inner cylinder 2, and revolves along the circumference. In addition, the short arm 4e,
4f may be made long and a roller may be attached to each end thereof.

15 is a motor for driving the winding mechanism, which includes a sprocket 16, a chain 17. The arm 4 is driven via a sprocket 18 and a hollow rotating shaft 19.

One end of the cable 20 passes through the inside of the hollow rotating shaft 19 and exits below the center of the device, and is connected to a downstream device, such as an underwater work machine, and the other end exits below the outer cylinder 1, and connects to an upstream device, such as an underwater work machine. It is connected to a cable winch on the ship.

Cable 20 is susceptible to bending and twisting.

When the diameter of the cable is D c (m), the allowable bending radius R6 (+a) and the allowable length Ll (no) for one twist are R6≧(30X Da)/2 LT≧2, respectively. It is given by ×πxRB. Therefore, the large diameter feed sheaves 5 and 8 have a radius R
B (+m) or more is required. Furthermore, in this device, the cable 20 is twisted once per revolution of the feed sheave 5, so the circumference of the inner cylinder 2 must be at least LT (■).

The optical fiber cable winding device having the above configuration winds the optical fiber cable of underwater rope equipment etc. on board the ship.
Alternatively, in addition to the equipment for sending out optical fiber cables, there may be cases where it is necessary to configure equipment for winding optical fiber cables without using optical rotary connectors (slip rings) for general purposes, or cable-like devices that cannot be twisted ( fiber optic cable, gas-filled coaxial cable,
It can be applied to winding devices for hydraulic hoses, etc.).

(Function) 1) For winding; When arm 4 rotates counterclockwise (arrow a in Figure 1),
The feed sheaves 5 and 8 revolve counterclockwise while rotating clockwise. The cable 20 is fed from below the center of the device through the inside of the hollow rotary shaft 19, through the guide portion 21, along the feed sheaves 5 and 8, and wound around the outside of the inner cylinder 2. The gap between the feed sheaves 5 and 7 and the gap between the feed sheaves 8 and 10 are slightly smaller than the diameter of the cable 20, and the frictional force generated here and the optical fiber cable 2 between the feed sheaves 5 and 8 are slightly smaller than the diameter of the cable 20.
The friction force generated along the cable 20
is fed and wrapped around the outside of the inner cylinder 2.
The rollers 11, 12, 13, and 14 of the arm 4 revolve around the periphery of the arm 4, and serve to hold down the cable 20 that has been wrapped once so that it does not slip upward.

2) In the case of feeding; When the arm 4 rotates clockwise (arrow b in FIG. 1), the feeding sheaves 5 and 8 revolve clockwise while rotating counterclockwise. The cable 20 wound on the outside of the inner cylinder 2 is fed out by the same frictional force as in the case of winding. However, this is because each feed sheave rotates in the opposite direction to that for winding.

The cable 20 is sent in the opposite direction, passes through the interior of the one-rotation shaft 19, and exits from below the center of the apparatus.

(Effects) The feed sheave is driven by a gear or sprocket that engages with an internal gear attached to the inside of the inner cylinder or a guide chain attached to the inside of the inner cylinder, and rotates while revolving, so it is possible to drive the feed sheave using an optical rotary connector, etc. You can easily wind up or send out optical fiber cables without using a . By using two sets of closely spaced feed sheaves, no excessive tension is applied to the optical fiber cable, and by arranging the feed sheaves in pairs on both sides, bending of the cable can be minimized. The twist of the cable can be reduced to one degree per revolution of the feed sheave.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a winding device according to the present invention. Figure 2 is also a side view. FIG. 3 shows a known drum winding system for optical fiber cables. In the figure: 1 Outer cylinder 2 Inner cylinder 3 Internal gear 4 Arms 4a to 4d Long arms 4e, 4f Short arms 4g, 4f Frame 5, 8 Large diameter feed sheave 6.9 Gear 7, 10 Small diameter feed sheave 11.12 ,13,14 Roller 15
Motor 16 Sprocket 17 Chain 18
Sprocket 19 Hollow rotating shaft 20 Optical fiber cable 21 Above the guide part

Claims (1)

[Scope of Claims] (I) An optical fiber cable storage part is constituted by an outer cylinder with a bottom and an inner cylinder, and has a plurality of rollers rotating on its own axis on the inner cylinder and the outer cylinder at the tip, and has a hollow center. a pair of large-diameter feed sheaves rotatably attached to the arm; It consists of a small-diameter feed sheave, a drive mechanism for the hollow drive shaft of the arm, and a rotation drive mechanism for the large-diameter feed sheave. An optical fiber cable winding device characterized in that the optical fiber cable passes through a pair of sheaves, is wound around an inner cylinder, is taken out from the bottom, and each end is connected to an upstream and downstream working machine, etc. (II) The rotational drive mechanism of the large-diameter feed sheave is characterized by comprising an internal gear provided on the inner surface of the inner cylinder, and a gear provided coaxially with the lower part of the large-diameter feed sheave that meshes with the internal gear. An optical fiber cable winding device according to claim I. (III) The rotational drive mechanism of the large-diameter feed sheave is comprised of a guide chain provided on the inner surface of the inner cylinder and a sprocket coaxially provided at the bottom of the large-diameter feed sheave that engages with the guide chain. An optical fiber cable winding device according to claim I.