JPS62123409A - Optical rotary accumulator - Google Patents

Abstract

PURPOSE:To accumulate a large extent of rotation and to secure the long life of an optical cable by winding spirally the optical cable around the outside peripheral surface of a hollow shaft in a take-up space between the outside peripheral surface and the inside peripheral surface of an outer case and setting the inside diameter of the innermost loop in the loosened state and that of the outer case so that a prescribed condition is satisfied. CONSTITUTION:A flat optical cable 14 is wound spirally around the outside peripheral surface of a hollow shaft 11 in a take-up space 13 and has a winding start 14a and a winding end 14b fixed to the hollow shaft 11 and the outer case 12. This rotary accumulator is set to a cable reel, and the outer case 12 rotted together with the cable reel is formed into a rotating body, and the hollow shaft 11 is formed into a non-rotating body, and the cable 14 is tightened when the outer case 12 is rotated in the direction of an arrow M, and the optical cable 14 is loosened when the outer case 12 is rotated in the direction of an arrow N. An inside diameter D1 of the outer case 12 is made equal to or larger than 1.3D (D is the natural diameter of the optical cable) and an inside diameter D2 of an innermost loop 14x of the optical cable 14 in the loosened state is made equal to or smaller than 1.1D, thereby preventing buckling of the optical cable 14 and accumulating a large extent of rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application J The present invention relates to an optical rotary accumulator suitable for optically connecting a rotating body and a non-rotating body.

1 Conventional technology 1 When performing optical communication between a moving device such as a stacker crane or reclaimer and a fixed device that remotely controls or monitors the operating status of the moving device, for example, a cable reel is installed on the moving device side. An optical rotary accumulator is attached to the cable reel to enable optical communication between the rotating body and the non-rotating body.

What is known as such an accumulator.

There are IJIs such as JP-A No. 58-145076, No. 59-43777, and No. 59-53010.

In each of the above conventional accumulators, as shown in No. 6 [4], the hollow shaft l and the outer case 2 are assembled so as to be relatively rotatable with a winding space 3 interposed between the inner and outer peripheries thereof,
An optical tape cable (hereinafter referred to as an optical cable) 4 is spirally wound around the outer periphery of the hollow shaft l in the winding space 3, and the 1If4 ends of the spiral, that is, the winding start end and the winding end are connected to the hollow shaft. 1 and each fixed to the outer case 2.

-1- In the case of the accumulator described above, either the hollow shaft l or the outer case 2 (for example, the outer case 2) is a rotating body, and the other is a rotating body.

The rotation XI5 of these rotating body and non-rotating body phase η is the maximum winding J tightened state when the optical cable 4 is wound around the outer circumference of the hollow shaft l by the relative rotation of both members, and the relative rotation opposite to that indicated by L. It is determined within the range of the maximum unrolled state when the optical cable 4 is unwound.

Usually, the rotational planting at this time is 50 rotations or more.

Also, one end of the optical cable 4 passes through the hollow shaft l and is pulled out of the shaft, and the other end is also pulled out of the outer case 2, so that when the accumulator is attached to the cable reel, the cable between the moving device and the fixing device is The connection will now be established.

Problem 1 to be solved by the invention The important problem of the optical rotary accumulator mentioned above is:
How to eliminate the accumulation of high-speed rotation darkness and obtain a long lifespan for optical cables.

Generally speaking, regarding rotary accumulators, it is best to preform a material with high rigidity into a spiral shape and store it in the winding space.
However, it is difficult to add such a single stage to an optical cable that does not have +1 stiffness and is inferior in strength.

In the case of optical rotary cumulators, generally medium
Attempts have been made to satisfy the above-mentioned rotational life by increasing the outer diameter of the T-sleeve and the inner diameter of the outer case, but this is not desirable as it tends to make the γQ1 router larger. .

As a special feature of the optical rotary cumulator.

The following phenomena can be cited.

In the accumulator shown in FIG. 6 described above, the hollow shaft l
After wrapping the optical cable 4 tightly around the outer circumference of the outer case 2, when the optical cable 4 is unwound as shown in FIG. show.

When the optical cable 4 is unwound from this state, the spiral optical cable 4 is indented by the unwinding loop from the inner layer, and the layered state described above becomes even denser, increasing the frictional resistance.

If the optical cable 4 is forcibly unwound from this state, the loops of the optical cable 4 will form a ball into multiple layers, and the unified structure will roll and swell inside the outer case 2, but it will not be able to form a spiral. The diameter hardly increases.

Finally, as shown in Figure 7, 5
A curve 5 occurs in the inner layer of the optical cable 4, and
The optical cable 4 buckles at the point.

In view of the problems 1 and 2, it is an object of the present invention to provide an optical rotary accumulator that is capable of accumulating high-voltage cables and ensuring a long lifespan of optical cables, including prevention of buckling.

Means for Solving Problem 1 J In order to achieve +l (1'! In an optical rotary accumulator, an optical tape cable is spirally wound around the outer periphery of a hollow shaft in the winding space, and both ends of the spiral are fixed to the hollow shaft and the outer case, respectively. , "-If the inner diameter of the case not mentioned is D+, the natural loop diameter of the J bipedal optical tape cable is D, and the inner diameter of the innermost loop of the optical tape cable in the unwound state is DI, then D, ≧1.3D, It is characterized by satisfying D2≦1.1D.

Embodiment J Hereinafter, embodiments of the optical rotary accumulator according to the present invention will be described with reference to the drawings.

In Figures 1 to 3, II is a hollow shaft made of metal, and 12 is a hollow shaft made of metal or synthetic resin (F
(including RP).

2 hollow shafts 11. The outer case 12 is assembled so as to be relatively rotatable with a winding throat gap 13 interposed between the inner and outer peripheries.

Reference numeral 14 denotes an optical tape cable (rP, hereinafter referred to as optical cable), and the optical cable 14, which has a tape-like flat cross-sectional shape, connects adjacent optical fiber cores 71 to 41, as illustrated in FIG. 15 and the FRP wire 16, these plural pairs are covered with a coating layer 17 made of brass tink (including FRP).

The optical cable 14 is spirally wound around the outer periphery of the hollow shaft 11 within the winding space 13.

A winding start end 14a and a winding end 14b, which are both ends of the spiral, are fixed to the hollow shaft 11 and the outer case 12, respectively.

Reference numeral 18 denotes a bearing interposed at the fitting portion between the hollow shaft 11 and the outer case 12.

19 is a slit bored in the hollow shaft 11 in order to draw one end of the optical cable 14 out of the hollow shaft 11; 20 is a slit in order to draw out the other end of the optical cable 14 out of the outer case 12;
This is a slit bored in the outer case 12.

21 are the winding start end 14a and the a-terminus end 14 of the optical cable 14.
This is the stopper that fixes b.

The optical rotary cue L/lator according to the present invention uses one of the hollow axially outer cases 12 as a rotating body and the other as a non-rotating body, as in the conventional example, such as a static crane, a reclaimer, etc. Attach the optical rotary accumulator to the cable reel installed in the cable reel.

In the case of such usage, the outer case 12 that rotates together with the cable reel becomes a rotating body, and the hollow shaft 11 becomes a non-rotating body, and when the outer case 12 rotates in the direction of arrow M in FIG. When the shaped optical cable 14 is tightly wound and the outer case 12 is rotated in the direction of arrow N in FIG.
, the optical cable 14 is unwound.

In the present invention, the inner diameter D1 of the outer case 12 is set to DI≧1.30 based on the natural loop diameter of the optical cable 14, and the innermost loop 14x of the optical cable in the unwound state is Eleven stages are provided to maintain the inner diameter D2 such that 02≦1.10.

The natural loop WD here is the diameter when the optical cable 14 is exactly circular as shown in FIG.

The natural loop diameter tends to increase as the optical cable 14 has a higher rigidity and a lower weight per unit length, and conversely, the lower the optical cable 14 has a lower rigidity and the greater the tonne h1 per unit length. , shows a tendency to become smaller.

Furthermore, when the rigidity of the optical cable 14 is the same, the optical cable weight l'(/) increases, the natural loop diameter decreases, and furthermore, when the optical cable I(, Q/?ti) length remains the same, the natural loop diameter decreases. As the optical cable stiffness increases, the natural loop diameter increases.

D in uninvented! The reason for setting ≧1.30 is to calculate the following: 1.5 times.

That is, when the optical cable 14 is unwound at <1.30, the outermost loop 147 comes into contact with the outer case 2 before the optical cable 14 is fully unwound, making further unwinding difficult. If the optical cable 14 is forcibly unwound in such a state iE, the optical cable 14 will buckle.

Of course, if the optical cable 14 cannot be unwound sufficiently, the relative rotation between the hollow shaft 11 and the outer case 12 cannot be increased.

In addition, in the case of satisfying DI≧1.30 in the present invention, the outer diameter D1 of the outer case 12 may be a little more than 1.30, and it is uneconomical to unnecessarily increase the outer diameter D+ of the outer case 12. Not only that, but it also increases the size of the accelerator.

The reason for retaining 02(1, 10 in the present invention) is to avoid the following l(I!;).

In other words, the optical cable 14 is adjusted so that 07>1.10.
When unwound, the three-figure curve described in FIG. 7 is generated in the inner layer of the optical cable 14, and the optical cable 14 is folded into a seat.

In order to maintain D2≦1.10, for example, D2=1
．． When the ID reaches the unwinding state, 1) Reverse the accumulator of the present invention from unwinding rotation to tightening rotation 1
D from the stage or the tightened state? = 1. Rotation leading to the unwinding state of 1D; 1 yen was measured in advance,
When the rotation iIl is reached, the hollow shaft 11 and the outer case 1
A single stage r is adopted which stops the relative rotation with respect to the rotor 2.

1-Reversal can be achieved by switching the drive motor of the cable reel to which the accumulator of the present invention is attached from stop rotation to reverse rotation, and similarly, 1-foot braking can be performed by the first stage of braking (for example, an electromagnetic brake) of the cable reel. If possible, these can be implemented using initial settings or a tachometer.

Hereinafter, specific examples of the present invention and comparative examples thereof will be explained.

Specific examples 1 to 8 Medium? The shaft 11 used had an outer diameter of 70 mm, and the outer case 12 had an inner diameter O1 of 800 m5.

Therefore, the character spacing 13 for one winding is 70mmφ to 600Iφ
It has a volume of

The optical cable 14 used had 6 cores and an FRP coating thickness of 1.2 ml.

The natural loop diameter of this optical cable 14 is approximately 40 (
lsmφ.

Therefore, the L DI is 1.50, and DI≧1.3
It satisfies D.

Under the above conditions, the hollow shaft 11 is a non-rotating body and the outer case 12 is a rotating body, and the length of the optical cable 14 is changed for each piece to determine the amount of relative rotation between the hollow shaft 11 and the outer case 12, that is, the buckling of the optical cable 14. The innermost loop 14 of the optical tape cable 14 in the unwound state is determined together with the maximum rotation 7a at which no occurrence of the rotation 7a occurs. Inside? ¥02 was fixed at A11.

The results are shown in Table 1.

Notation The opening 2 in each specific example satisfied the expression 2≦1.1D.

Comparative Examples 1 to 4 For comparison, the maximum rotation tt2 was set to 4 in L-marked silicon body example 2.
8 times (comparative example 1), and the maximum rotation iM in specific example 4
was set to 66 times (Comparative Example 2), the maximum rotation t was set to 72 times (Comparative Example 3) in Specific Example 6, and the maximum rotation t was set to 76 times (Comparative Example 4) in Specific Example 8. By the way, these comparative examples 1 to 4
In [12, D2>1-10.

Northern body example 9 In the same specifications as each of the above-mentioned examples, D2 is changed to 1 of D.
．． 075 times or 07. When the optical cable 14 was rotated 500,000 times, the optical cable 14 withstood the 1iA test without buckling.

Comparative Example 5 For comparison, D2 in Specific Example 9 was set to 1.15 times D, that is, 02>1.10, and the optical cable 14 was changed from a tightly wound state to an unwound state! When the same rotation test as above was carried out with the maximum number of rotations over the island being set to 65 times, the rotational torque of the straight 1i71 that transitions from the tightening state to the unwinding state increased, and along with this, the frequency of buckling increased extremely. As a result, 5 out of 6 fibers of optical cable 14 were disconnected.

r Effect of the Invention 1 As explained in 1-1 above, in a predetermined optical rotary accumulator, M of the outer case is Dl, the natural loop diameter of the optical tape cable is D, and the unreleased 1gI is the innermost part of the optical tape cable in the unwound state. When the inner diameter of the loop is D2, since DI≧1.3D and D2≦1.1D are satisfied, a high rotation speed can be achieved, and a long life of the optical cable including buckling prevention 1 can be ensured.

[Brief explanation of drawings]

Figure 1 shows a single-light low clear accumulator with no light emitted.
A longitudinal cross-sectional view showing the embodiment, FIG. 2 is a cross-sectional view taken along the line l-l1 in FIG. 1 showing the optical cable in a tightly wound state, and FIG. 3 is a cross-sectional view taken along l-l1 in FIG. 1 showing the optical cable in an unwound state. Figure 4 is a cross-sectional view of the optical cable, Figure 5 is an explanatory diagram showing the natural loop of the optical cable (¥), Figures 6 and 7 are the state in which the optical cable is wound tightly in the conventional optical rotary neemulator. , is a cross-sectional view showing an unrolled tab. 11...Hollow shaft 12e ss * Outer case 13... Winding space 14 - Optical tape cable 14a... Spiral Winding start end +4b φ... Spiral winding end 14K Fist... Innermost loop 147 - 4* Outermost loop Agent Patent Attorney & Yoshio Fuji No. 1a Figure 3 Figure 2

Claims (1)

[Claims] A hollow shaft and an outer case are assembled so as to be relatively rotatable with a winding space interposed between their inner and outer peripheries, and an optical tape cable is spirally wound around the outer periphery of the hollow shaft within the winding space. In an optical rotary accumulator in which both ends of the spiral are fixed to a hollow shaft and an outer case, the inner diameter of the outer case is D_1, the natural loop diameter of the optical tape cable is D_1, and the maximum diameter of the optical tape cable in the unwound state is An optical rotary accumulator characterized by satisfying D_1≧1.3D and D_2≦1.1D, where the inner diameter of the inner loop is D_2.