JPS6131064B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure in an optical fiber drawing line. The function of an optical fiber drawing line is to feed the optical fiber base material into a furnace (usually an electric furnace) at a constant speed, melt the tip, and draw it out from the bottom end of the base material at a constant speed to form a fiber. do. A synthetic resin such as silicone is coated on the outer periphery of the fiber, and then hardened by passing it through a heating furnace. This produces an optical fiber strand (hereinafter referred to as strand), which is then fed to an extrusion line, which is another equipment, and is coated with a secondary coating of nylon or the like to obtain a cored optical fiber. However, if the tensile strength of the core wire is below a certain value, the core wire may break due to the laying tension when it is finally laid as an optical cable. Therefore, usually, tension is applied once to the strands and the portions where the required tensile strength is not reached are broken in advance. It is necessary to perform so-called screening, and from the point of view of efficiency, it is usually done at the delineation line. Here, a problem when performing screening on a drawing line is that in a conventional drawing line, when a strand breaks, the speed of the entire line is reduced to the extent that it can be drawn by hand.

This method had a problem in that the operating rate of the line decreased due to wire breakage. First, in order to facilitate the explanation of the contents of the present invention, the conventional drawing lines shown in FIG. 1 will be explained. Reference numeral 1 denotes an optical fiber base material, and 2 a base material feeding device that feeds the optical fiber base material 1 to the electric furnace 3 at a constant speed. Reference numeral 4 denotes a resin coating device that coats the outer periphery of the optical fiber 5 with silicone resin or the like. 6 is a heating furnace, which hardens the resin and heats the wire 7.
get. 8 is a guide roller, 9 is a main pulling device,
The wire 7 is taken off at a constant speed. A dancer roller 10 controls the speed of the next sub-take-off machine 11'.
A dancer roller 12 controls the speed of the winding machine 13. To explain the relationship between the speed control from the main take-up machine to the winding machine, reference numeral 14 denotes a main take-up machine drive variable speed motor, which is operated at a speed commanded by the main controller 15. Reference numeral 16 denotes a controller for commanding the speed of the sub-take-up device 11', which receives commands from the main controller 15, and further receives a correction signal from the displacement detector 17 of the dancer roller 10 to drive the variable speed motor 18'. A controller 19 instructs the speed of the winding device 13, which receives an output signal from the controller 16 and further receives a correction signal from a displacement detector 20 of the dancer roller 12 to drive a variable speed motor. In the drive system described above, the tension of the wire 7 between the main take-up machine 9 and the sub-take-off machine 11' is
Similarly, the tension of the wire 7 wound by the winder 13 is determined by the load 23 of the dancer roller 12. Therefore, the tension of the former can be made strong and the tension of the latter made weak.

Here, the former is the screening tension and the latter is the winding tension. Since it is desirable that the winding tension of the strands be as small as possible, the configuration described above is common. In this conventional line, when the wire 7 is broken between the main take-off machine 9 and the sub-take-off machine 11' due to screening, the wire is manually re-threaded, that is, it is wound up using the dancer roller 10 and the sub-take-off machine 11'. After the linear speed of the entire line is reduced to a speed at which re-starting is possible up to machine 13, re-starting is performed and the speed of the entire line is increased again. Therefore, there are disadvantages in that the strands between them become defective and the operating rate decreases. The present invention aims to solve these problems, and specifically provides a method that does not produce a large amount of defective wires or reduce the operating rate even if the wires break due to screening. It is characterized by a device that melts and heats the optical fiber base material for spinning, and at least a main trading device, a wire storage device, a sub-first pulling device, a tension adjustment device, a sub-second trading device, and a winding device. This drawing line is characterized in that it is provided with a wire speed control device that adjusts the take-up speed of the sub-first transaction device, the sub-second transaction device, and the take-up device, respectively.

Next, details of the present invention will be explained with reference to FIG. Note that the same symbols as in the conventional line indicate the same equipment parts.

9 is the main collection device, 24 is the sub-first collection device, 10
12 is a dancer roller that controls the speed of the winding device 13; and 25 is a wire storage device for storing the strands. The guide roller group 26 is a fixed side guide roller, and the guide roller group 27 is a movable guide roller and is always pulled in the direction of accumulating the strands 7 by a load 28. 29 is a detector for controlling the speed of the sub-first pulling device 24, and when the wire storage device 25 is not storing wires, in other words, when the wire is not broken by screening, the movable guide roller group 27 is fixed. It is located close to the side guide roller group 26, and at that time,
The moving roller group 27 is configured to be coupled to the detector 29 . Next, to explain the difference between the speed control relationship from the main take-up device 9 to the winder 13 from the conventional line, the command from the main controller 15 drives the main take-up device variable speed motor 14 and the sub-first take-up device. The device linear velocity control device 30 is commanded. The sub-first controller 30 receives a correction signal from the detector 29 of the wire storage device 25 and drives the variable speed motor 31 of the sub-first take-off device 24 except when the screening is broken.

In addition, the linear speed control device 30 for the sub-first pulling device is equipped with a device to reduce the speed at the time of screening breakage and to enable manual replacement of the strands.
It is configured to receive a speed reduction command signal 32.
16 is a linear speed control device for the second sub-drawing device;
In addition to receiving commands from the linear speed control device for the pulling device, the variable speed motor of the sub-second pulling device 11 is driven by taking in signals from the detector 17 of the dancer roller 10. Hereinafter, the drive of the motor of the winding machine 13 is the same as the conventional one. The tension of the wire is maintained at the tension set by each dancer roller and the moving side guide roller weights 28, 22, and 23 of the wire storage device.
In the configuration of the present invention, the sub-first withdrawal device 24 and the sub-second
Screening is performed between the collection devices 11. In other words, since the speeds of the sub-first take-off device 24 and the sub-second take-off device 11 are controlled as described above, the tension of the wire between them is determined by the weight 2 of the dancer roller 10.
The tension set in step 2 is maintained, and this tension is
Since it does not affect other parts, that is, the tension of the winder 13 and the wire tension of the wire storage device 25, the value of this tension is increased and used as the screening tension.

Similarly, the tension between the other parts, that is, the main pulling device 9 and the sub-first pulling device 24, is set by the weight 28, and the value of this tension is set to a value that does not lead to wire breakage. Also, the sub-second take-up device 11 and the winder 13
Since the tension between can be set by the weight 23 of the dancer roller 12, it can be made relatively small and can be wound up loosely. Here, to describe the effect when the screening breaks, when the wire between the sub-first pulling device 24 and the sub-second pulling device 11 breaks, a speed reduction command signal is sent to the linear speed control device 30 for the sub-second pulling device. 32 is given and the speed is reduced.
At the same time, the speeds of the sub-second take-up device 11 and the winder 13 are also reduced. Since the sub-first pulling device 24 has a wire holding mechanism (not shown), even if the wire is broken during screening, the wire storage device does not stop picking up the wire. In this state, a speed difference occurs between the main take-off device 9 and the sub-first take-off device 24, so the moving side guide roller 27 of the wire storage device 25
, descends and stores the strands 7. Since the tension set by the weight 28 is maintained even during wire storage, the wire will not break at this portion. In this state, the wire at the broken part is replaced. When the line speed control device for the sub-second take-off device is finished, the command of the linear speed control device for the sub-second take-off device is returned to its original state, thereby increasing the speed of the sub-first take-off device 24 and onwards, and returning to the previous state. However, the speed of the main take-off device 9 does not change during the recovery from the breakage, and the strands produced during the recovery are absorbed into the wire storage device 25.
When returning to the previous state, it is screened and wound, so there is almost no loss of strands.
Therefore, the drawbacks of conventional lines can be improved in terms of loss and operating rate. The important points regarding the structure of the present invention are as follows.
As mentioned above, the wire tension sections in the line are divided into the tension section of the wire storage device section, the tension section of the screening section, and the tension section of the winding section, and the line is configured in this order. The purpose of the present invention cannot be achieved by changing this configuration or order. In the text description, an example of this configuration has been shown and explained, but for example, the configuration after the sub-first take-off device is as shown in FIG.
and a torque generator 35. A tensioning device 36, a dancer roller 12, and a winding machine 13 may also be used. In this case as well, the tension section is clearly divided into a wire storage device section, a screening section, and a winding section, and the order of construction is the same.

[Brief explanation of the drawing]

Figure 1 shows the conventional delineation line, Figures 2 and 3
The figure is a schematic diagram of the drawing line of the present invention. 1... Base material, 3... Heating furnace, 7... Element wire, 9...
...Main collection device, 25... Line storage device, 24... Sub-first collection device, 11... Sub-second collection device, 13...
Winding device, 22, 23, 28... power adjustment device,
19, 15, 30, 16... linear velocity control device.

Claims (1)

[Scope of Claims] 1. A device for melting and heating an optical fiber base material for spinning, and at least a main take-off device, a wire storage device, a sub-first take-off device, a tension adjustment device, a sub-second deal device, and a winding device in order. A line drawing line, characterized in that it is provided with a line speed control device that is arranged and adjusts the take-up speed of the sub-first transaction device, the sub-second transaction device, and the winding device, respectively.