JPH05338916A - Rewinding method for filament body - Google Patents

Abstract

PURPOSE:To control a filament body to be optimum in delivery length even if the quantity of winding of the filament body is reduced. CONSTITUTION:When an optical fiber 2 winded up onto a delivery roll 1 is drawn out via a capstan wheel 3 so as to be taken up onto a rewinding roll 7, in a rewinding method which controls the rotation speed of a delivery roll 1 in response to output obtained by integrating gains with the operation quantity of a dancing roll 11, gains shall be increased as the quantity of winding of the delivery roll 1 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rewinding method.

[0002]

2. Description of the Related Art In a production line of optical fibers as linear bodies, in order to guarantee the breaking life of the optical fibers, a proof test (screening) in which a certain tension is applied to a part of the line to break and remove a weak part is usually used. Test). This screening test is performed by a screening device. In such a screening device, the optical fiber is paid out from the pay-out roll through the capstan wheel and taken up by the pay-out roll.

In such a linear body rewinding device, when the amount of the linear body fed out from the feeding roll is dancer controlled in accordance with the capstan speed, the rotation speed of the feeding roll motor is determined based on the output of the dancer roll. The method of controlling as an operation target is the simplest and most common.

[0004]

However, in the above-mentioned conventional method, when the winding amount of the feeding roll is different, the feeding amount for the same number of revolutions is different, so that the feeding length controlled by the winding amount of the feeding roll varies. There is a problem. For example, when the gain of the dancer roll is adjusted to the optimum value in a state where the winding amount is large, the output when the same operation amount occurs in the dancer roll becomes smaller than the initial value when the unwinding proceeds and the winding amount decreases. As a result, problems such as deterioration of responsiveness of the dancer roll and occurrence of residual deviation in which the neutral position of the dancer roll moves over time occur.

In order to avoid the occurrence of such a problem, conventionally, proportional-integral control has been used, and control is performed by adding an integral term to the operation amount to absorb a decrease in output due to a decrease in winding amount. However, even in this case, if the winding amount decreases too much, the control cannot keep up with the deviation due to the poor response of the integral control, the tension fluctuation increases, and the dancer roll reaches the lower or upper limiter. Reach and lose control.

In order to avoid such a phenomenon, conventionally, the gain has been set high in advance. However, if the gain is increased in this way, hunting is likely to occur this time, and there is a problem in that tension fluctuation also increases.

In view of such circumstances, it is an object of the present invention to provide a linear body rewinding method capable of controlling an appropriate payout length regardless of a change in the winding amount of a payout roll.

[0008]

In the method for rewinding a linear body according to the present invention to achieve the above object, a linear body wound around a delivery roll is delivered through a capstan wheel and taken up by a take-up roll. In this case, in the linear body rewinding method for controlling the rotation speed of the delivery roll according to the output obtained by integrating the gain with the operation amount of the dancer roll provided between the delivery roll and the capstan wheel. The gain is increased as the winding amount of the pay-out roll is decreased.

The structure of the present invention will be described in detail below. In the present invention, the gain is increased as the winding amount of the payout roll is decreased. Therefore, when the winding amount is decreased, the output (operation amount) corresponding to the same operation amount of the dancer roll is increased, and the payout is operated in accordance with this. The rotation speed of the roll increases.
Therefore, the feeding length operated corresponding to the same operation amount is made uniform.

The adjustment of the output corresponding to the operation amount of the dancer roll will be described by taking the normal proportional-plus-integral control as an example. That is, in proportional-plus-integral control, the output y shown in the following equation 1
The rotation number of the pay-out roll is controlled by using as an operation amount, but the present invention can be achieved by adjusting the proportional gain K _P in this case. Note that z is the motion amount, T ₁
Indicates the integration time.

[0011]

[Equation 1]

Here, in order to adjust the proportional gain K _P according to the winding amount of the payout roll, some parameter indicating the winding state of the payout roll is required. Normally, the payout length is adjusted by a capstan or a counter roll. Since it is counting, it is appropriate to adjust the gain K _P using this feed length. As a method of adjusting the gain K _P based on the payout length, there are a method of simply obtaining the gain K _P from the payout length and a method of obtaining the winding diameter from the payout length and obtaining the gain K _P from this winding diameter. Two types are possible.

The gain K is calculated from the feeding length._PIs the next
According to the number 2. Here, L is the feeding length, L₀Is the early
The winding amount, A and B are constants. The constants A and B are L
= L ₀Optimum gain K when₁And the optimum when L = 0
Gain K₂, And K₁= B / A, K₂= B /
(L₀It can be obtained from the relationship of + A).

[0014]

[Equation 2]

As described above, the method of obtaining the gain K _P from the payout length has the advantage that the formula is simple and the coefficient relating to the bobbin shape is not required, but since it is different from the actual winding diameter decreasing function, In particular, when the change in the winding diameter is large, the tension fluctuation may increase during the feeding.

On the other hand, the method of obtaining the gain K _P from the winding diameter is given by the following equation 3. Here, R is the winding diameter, r is the barrel diameter of the feeding roll, L is the feeding length, L ₀ is the initial winding length,
A'and B'are constants. A'is a constant that is determined by the winding pitch, the diameter of the linear body, etc. This value can be calculated, but the winding diameter when the constant length linear body is wound around the pay-out roll to be used should be measured. Can be easily obtained by. Also, B ′ is obtained by the optimum gain adjustment by experiments, but unlike the above-mentioned constant B,
It can be measured at any payout length.

[0017]

[Equation 3]

The present invention will be described below based on examples.

FIG. 1 shows a schematic configuration of a general optical fiber screening apparatus as an example of a linear body rewinding apparatus for carrying out the present invention.

In the figure, 1 is a delivery roll for delivering the drawn optical fiber 2, 3 is a capstan wheel for winding and pulling the optical fiber 2, and the capstan wheel 3 supports the optical fiber 2 by a capstan belt 4. Is becoming 5 is a screening roll, 6 is a tension roll, 7 is a winding roll,
Tension is applied to the optical fiber 2 by the axial torque between the capstan wheel 3 and the screening roll 5, and the optical fiber 2 is wound by the winding roll 7. Reference numeral 8 is an arm-type take-up dancer provided between the pay-out roll 1 and the capstan wheel 3, and 9 is an arm-type take-up dancer provided between the tension roll 6 and the take-up roll 7. And feeding roll 1
Fluctuations in speed and tension between the capstan wheel 3 and the winding roll 7 are absorbed by the feeding dancer 8 and the winding dancer 9.

In the above-mentioned screening apparatus, the optical fiber 2 is fed from the feeding roll 1, tension is applied between the capstan wheel 3 and the screening roll 5 by the axial torque, and the optical fiber 2 is wound by the winding roll 7. The line speed is determined by driving the capstan wheel 3. Fluctuations in speed and tension between the feeding roll 1 and the capstan wheel 3 and between the capstan wheel 3 and the winding roll 7 are absorbed by the feeding dancer 8 and the winding dancer 9. An optical fiber 2 between the capstan wheel 3 and the screening roll 5
Tension is applied to the optical fiber 2, and the optical fiber 2 is broken at the low strength portion. Thereby, the optical fiber 2 in the low strength portion is not wound by the winding roll 7.

When the optical fiber 2 is first fed out from the feeding roll 1 in the screening device to carry out the wire hanging, the feeding roll 1 is rotated at a constant low speed, and the operator brings the tip of the optical fiber 2 to the capstan wheel 3. Carry
Then, the tension is adjusted so that the dancer roll 11 of the feeding dancer 8 is in the center of the swing range. In this state, the capstan belt 4 is lowered to start the operation. driving,
When the tension of the optical fiber 2 fluctuates, the dancer roll 11 swings up and down accordingly, and the rotation speed of the delivery roll 1 is adjusted based on the swing of the dancer roll 11 to change the speed and tension of the optical fiber 2. Is absorbed (dancer control).

The dancer control is performed by the controller 12. When the motion amount of the swing of the dancer roll 11 is input to the control device 12, a value obtained by integrating the motion amount with a gain is calculated (for example, by the above-mentioned formula 1). The gain used at this time is adjusted based on the above-described equation 2 or 3. Then, the rotation speed of the feeding roll 1 is controlled by the operation amount according to the integrated value.

Next, a specific measurement example will be shown. Feeding roll 1
With a barrel diameter of 300 mm, a barrel inner width of 300 mm, and a flange diameter of 620 mm.
Is wound until it is fully wound (winding length 1 × 10 ⁶ m), and this optical fiber 3 is drawn at linear velocities of 300 m / min, 600 m / min, 1
Each was fed out at 200 m / min. At this time, the dancer roll in the case where the optimum gain in the initial stage (full winding state) is set to 1 and the gain is calculated and controlled by the formula 2 (Example 1) and when the gain is calculated and controlled by the formula 3 above. When the fluctuation of the feeding tension caused by the rocking of No. 11 was measured, the results shown in Tables 1 to 3 below were obtained. In addition, the payout length and K
The relationship with _P is shown in FIG. The constants in Equations 2 and 3 were set as follows.

Setting the constant of the equation (2): The optimum gain in the state where it is completely fed out by the experiment (L = 1 × 10 ⁶ m) is K _P =
Since it was 2, A = 1 × 10 ⁶ , by the above-mentioned method,
B = 2 × 10 ⁶ was obtained.

Setting the constant of the equation 3: The winding diameter at the time of full winding is 600
mm, the constant A ′ was calculated as A ′ = 4.72, and B ′ was B ′ = 300.

For comparison, Table 1 to Table 3 show the results when the gain was kept constant at the initial optimum value (comparative example).
It is also shown in FIG.

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

[Table 3]

As shown in Tables 1 to 3 and FIG. 2, when no gain adjustment was performed (comparative example), the linear velocity was 600 m.
Above / min, the line deviated due to tension fluctuations during the process, and subsequent feeding could not be achieved. On the other hand, in Examples 1 and 2 in which the gain adjustment was performed, the payout could be thoroughly achieved. Among them, the method of obtaining the winding diameter of the payout roll from the payout length and adjusting the gain as shown in Formula 2 is a linear velocity 1200.
Even at m / min, the tension fluctuation did not increase at all during feeding, and very good results were obtained.

[0032]

As described above, according to the present invention,
Since the gain of the dancer roll is adjusted according to the winding state of the pay-out roll, even if the winding amount is reduced, the pay-out length can be controlled to an appropriate pay-out length, and there is no fear that tension fluctuation will increase.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of a screening apparatus for carrying out the present invention.

FIG. 2 is a graph showing the relationship between the payout length and the gain in the example.

[Explanation of symbols]

 1 Feeding roll 2 Optical fiber 3 Capstan wheel 8 Feeding dancer 11 Dancer roll

Claims (2)

[Claims] 1. An operation of a dancer roll provided between the delivery roll and the capstan wheel when the linear body wound around the delivery roll is delivered through a capstan wheel and wound up on a take-up roll. In the linear body rewinding method for controlling the rotation speed of the payout roll according to the output obtained by accumulating the gain to the amount, a line characterized by increasing the gain as the winding amount of the payout roll is decreased. How to reshape a material. 2. The winding diameter of the feeding roll being fed, calculated according to the initial winding length input when the feeding roll is mounted and the feeding length measured by the counter, according to claim 1, and the feeding roll is set in advance. A method for rewinding a linear body, which comprises determining an optimum gain of a dancer roll based on a relationship between a linear velocity and a reduction rate of a winding diameter.