JPH0129218Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical fiber screening device that applies tension to an optical fiber to test its strength.

Figure 1 shows the principle of the screening device, in which a movable tension reel d is placed between a pair of capstans b and c that are rotatable around a fixed axis a, and these capstans and tension The tension reel d is suspended by wrapping an optical fiber e around the reel. Therefore, the optical fiber e between the capstan b and the tension reel d, and the tension reel d between the capstan c and the tension reel d are suspended. If the weight of the tension reel _d is w, then a tension of w/2 will act on each of the optical fibers e2 between them, and if the optical fiber e is run here, its entire length will be This will tell you whether there are any parts that cannot withstand the same tension.

In practice, devices such as those shown in FIGS. 2a and 2b have been conventionally used.

In this device, a ball bush g is movably straddled over a guide rail f having a pair of rails,
A tension reel d is connected to the same bush g.

One end of a rope i, which is wound around pulleys h, is connected to the ball bush g, and the position of the tension reel d can be adjusted by changing the weight of a weight j attached to the other end of the rope i. can be set arbitrarily.

For example, if the tension reel d is set at a relatively high position, the distance between the capstans b and c and the tension reel d becomes small, so that the time for applying tension to the optical fiber e can be shortened.

However, this device has the following drawbacks.

In other words, in the screening test for large diameter fibers with an outer diameter exceeding 125 μm, a considerable weight k is placed on the tension reel d, which causes slippage between the optical fiber e and the capstan c. Therefore, rapid and stable screening tests cannot be performed continuously.

Also, during the screening test, the optical fiber e that cannot withstand the tension will break, but in this case, the optical fiber e will come off from the capstans b and c and the tension reel d and get entangled with them, so it must be untangled to recover. Then capstans b, c
Also, the tension reel d must be re-routed, which takes time.

Furthermore, if the tension reel d deviates from the set position, the weight j at the other end of the rope i must be adjusted to rebalance the tension reel d. Moreover, since the ball bush g spans a pair of rails, there are many friction points, and the response of the tension reel d to the adjustment of the weight j is therefore slow.

The present invention attempts to solve the above problems by providing a mechanism for pressing the optical fiber against the capstan and by reducing the number of fulcrums of the tension reel.This will be explained with reference to the embodiment shown in the drawings. Fixed shaft 1 as shown in Figure 3
A pair of capstans 2a and 2b rotatable about a and 1b are arranged at approximately the same height, and a tension reel 3 is arranged below them and at a position approximately equidistant from them.

On the other hand, a guide rail 4 is erected at an appropriate position on the side of the tension reel 3, and on this guide rail 4,
Attach lever 5.

The lever 5 may be attached to the rail at any suitable location between its both ends, and this location becomes the fulcrum 6 of the lever 5.

The fulcrum part 6 can take any position with respect to the guide rail 4, and the lever 5 is configured to be rotatable around the fulcrum part 6.

One end of the lever 5 is attached to the central portion 7 of the tension reel 3, and holds the reel 3 rotatably.

Further, a balance weight 8 can be attached to the other end of the lever 5.

Therefore, the balance weight 8 can be appropriately selected according to the weight of the tension reel 3, and the lever 5 is kept in a substantially horizontal state, and the fulcrum part 6 is moved along the guide rail 4. Even if the lever 5 is moved, the lever 5 maintains its balance.

Since the lever 5 is thus set so as to maintain the horizontal state at all times, even when the optical fiber 9 is wound around the tension reel 3, no tension is applied to the fiber 9.

Therefore, the weight 10 is attached to the tension reel 3.

Then, the tension acting on the optical fiber 9 and the weight 1
By balancing this with the gravity of 0, it is possible to apply tension to the optical fiber 9 while keeping the lever 5 in a horizontal state.

In other words, only the tension corresponding to the weight of the weight 10 is acting on the optical fiber 9, and the tension reel 3
Since it is completely independent of its own weight, a constant tension will act on the optical fiber 10 even while the fulcrum 6 is moving.

In the figure, 11a and 11b are optical fibers 9
The capstans 2a, 2b are presser mechanisms for pressing, and are composed of rotating parts 12a, 12b, frames 13a, 13b for holding the rotating parts, and air cylinders 14a, 14b connected to the frames.

First, regarding the rotating parts 12a and 12b, as shown in detail in FIG. 4, a pair of rollers 15,
15, and an endless band 16 wrapped around these.

Stainless steel is preferred as the material for the rollers 15, 15, and their shapes are as shown in Figures 5a and 5b.
As shown in FIG. 2, the shape may be a cylinder or a barrel, and can be appropriately selected depending on the shape of the optical fiber 9.

The endless band 15 is preferably made of cloth impregnated with plastic, which is less abrasive, and the specific material thereof can be arbitrarily selected depending on the shape of the optical fiber 9 and the material of the coating layer.

The frames 13a and 13b have a pair of presser plates 17,
17, these presser plates 17,
The rollers 15, 15 are arranged within an interval of 17.

In other words, a pair of rollers 1 around which an endless belt 16 is wound.
5 and 15 are arranged between the presser plates 17 and 17, and through holes 18 and 18 are formed in the presser plate and the roller, respectively.
. . . and insert bolts 20, 20 through 19, 19, and tighten with washers 21, 21 and nuts 22, 22.

In addition, as shown in FIG.
It is preferable that any one of the two pairs of through holes 18, 18 formed in the capstan 7 be oval, and that the longitudinal direction of the through holes 18, 18 should be oval.
If they are formed along the circumferences of the rollers 15 and 2b, the relative positions of the rollers 15 and 15 can be adjusted by adjusting the positions of the bolts 20 inserted through the through holes 18 and 18, and as a result, the relative positions of the rollers 15 and 15 can be adjusted. This means that the tension of the endless band 16 can be adjusted accordingly.

Frames 13a, 13b are air cylinders 14
a, 14b, the pressing force of the rotating parts 12a, 12b against the capstans 2a, 2b can be changed by the air pressure sent to the cylinders.

FIG. 6 shows the state in which the holding mechanism 11a or 11b constructed as described above is used, and is movably clamped by the endless band 16 of the optical fiber 9 and the capstan.

Although one presser mechanism is used for one capstan 2a or 2b in FIG. 3, two presser mechanisms may be used as shown in FIG. 7.

As described above, the present invention is equipped with a holding mechanism for pressing the optical fiber against the capstan, so even if the tension applied to the optical fiber is increased, the optical fiber does not slip on the capstan and is made of a material that is easy to slip. Even if the optical fiber is coated, it will not slip in the same way, so high-speed and stable screening tests can be performed continuously.

Moreover, even if the optical fiber cannot withstand the tension and breaks, the holding mechanism prevents the optical fiber from coming off the capstan, and this prevents the optical fiber from getting entangled with other parts as much as possible. Recovery after disconnection can be done in a short time, improving work efficiency.

Further, when the tension reel is moved, since the friction point is only at the fulcrum, the time required to move the tension reel is extremely short, and therefore it is possible to immediately respond to various screening times.

[Brief explanation of drawings]

1 and 2 a and b are front views showing the conventional device, FIG. 3 is a front view of the device according to the present invention, and FIG.
The figure is an exploded perspective view of the presser mechanism, Figure 5 is a front view showing the shape of the roller, Figure 6 is a side view showing how the presser mechanism is used, and Figure 7 is a front view when a pair of presser mechanisms are used. It is. 1a, 1b... Fixed shaft, 2a, 2b... Capstan, 3... Tension reel, 4... Guide rail, 5... Lever, 6... Fulcrum part, 7... Center part of tension reel, 9 ...Optical fiber, 1
1a, 11b...presser mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An optical fiber is wound around a pair of capstans that are rotatable around a fixed axis, and a tension reel is wound around the optical fiber between the two capstans to apply tension to the optical fiber. The optical fiber screening apparatus to be applied has a holding mechanism for pressing the optical fiber against the capstan, and further has a fulcrum part between both ends of a lever, one end of which is rotatably attached to the center of the tension reel, as a guide rail. An optical fiber screening device, which is capable of being fixed at any position in the vertical direction, and in which the lever is rotatable about a fulcrum. (2) The holding mechanism consists of a rotating part that can rotate freely along the rotational direction of the capstan, a frame that rotatably holds the rotating part, and an air cylinder connected to the frame. The optical fiber screening device according to claim 1, which is clamped by the rotating part and the capstan. (3) The rotating part is rotatably supported by the frame.
The optical fiber according to claim 2 of the utility model registration is composed of a pair of rollers and an endless band wound around the rollers, and the optical fiber is clamped by the endless band and a capstan. Screening device. (4) The frame is equipped with a pair of holding plates, each holding plate is provided with an oval-shaped through hole that extends in the tensioning direction of the endless strip, and a bolt that passes through the roller is inserted into the through hole. The optical fiber screening device according to claim 3, which can be inserted freely.