JP5691283B2 - Extrusion coating apparatus and extrusion coating method - Google Patents

Description

The present invention relates to an extrusion coating apparatus and an extrusion coating method for forming a coating on an outer periphery of a linear body such as an optical fiber or an electric wire by an extrusion molding machine.

  A wire body such as an optical fiber core or an electric wire is covered with a resin material to protect it from an external force. For example, as disclosed in Patent Document 1, for the coating with a resin material, a linear body fed from a supply device usually travels on a line with a predetermined tension and passes through a crosshead of an extruder. It is formed by. The linear body to which the protective coating is applied by the cross head is taken up using a take-up machine such as a capstan and taken up by the wind-up machine.

JP 2010-61811 A

  FIG. 3A is a diagram schematically showing a pass line from the extruder to the winder in the prior art. That is, the wire 1 is coated by the extrusion molding machine 2, taken up by the take-up machine 3, and taken up by the winder 6 through the guide rollers 4 and 5. On this path line, the wire 1 is applied with a take-up tension T1 on the upstream side of the take-up machine 3 and with a take-up tension T2 on the downstream side of the take-up machine 3. In a normal winding state, the coating is uniformly applied at a constant linear speed at T1> T2, and the winding by the winder 6 is also performed at a predetermined winding speed. The take-up machine 3 includes, for example, a pair of wheels 3a and 3b, and both are rotated clockwise.

  As shown in FIG. 3B, the wheel gear 8 of the wheel 3a is controlled to rotate clockwise by the meshing of the teeth 7a of the drive gear 7 and the teeth 8a of the wheel gear 8. However, for example, when a winding disturbance or the like occurs in the winder 6 and vibration occurs in the filament 1, a tension fluctuation occurs between the take-up machine 3 and the winder 6. When the disturbance tension α due to this variation in tension occurs, the tension of the filament 1 becomes T1 <T2 + α, and the tension balance before and after the take-up machine 6 (inlet side and outlet side) is reversed. As a result, backlash occurs in the meshing between the drive gear 7 that drives the take-up machine 3 and the wheel gear 8.

  FIG. 3C illustrates a backlash generation mechanism. The play between the tooth 7a of the drive gear 7 and the tooth 8a of the wheel gear 8 cannot theoretically be zero, and there is some play. For this reason, as shown in FIG. 3C-I, in normal times, the wheel gear 8 rotates in the clockwise direction with its meshing teeth 8a coming into contact with the teeth 7a of the drive gear 7, and in a direction opposite to the rotational direction. Torque is generated. However, if there is a sudden fluctuation in tension on the winder 6 side as described above, the torque direction of the wheel gear 8 is reversed as shown in FIG. The tooth surfaces that rotate instantaneously faster than the rotation and contact with each other in the rotation direction are separated from each other, and then the tooth surfaces on the opposite side to the rotation direction come into contact with each other as shown in FIG.

As a result, the take-up speed of the take-up machine 3 fluctuates instantaneously, which causes vibrations in the filament 1. This vibration propagates to the extrusion molding machine 2 and there is a problem that abnormalities such as bumps occur in the coating diameter of the filament 1.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an extrusion coating apparatus and an extrusion coating method that are controlled so that fluctuations in tension on the outlet side do not propagate to the inlet side of the take-up machine.

In the extrusion coating apparatus and the extrusion coating method according to the present invention, the outer periphery of a linear body is subjected to extrusion coating by an extrusion molding machine, the coated linear body is taken up by a take-up machine, and then the coated filament is covered by a winder. a extrusion coating apparatus and method for winding a body, an inlet-side tension of the take-up device T1, the outlet side tension winder and T2, Ri by the subsequent puller disturbance suddenly occurring disturbance tension alpha, winder The tension load device for the auxiliary tension β is installed in the take-up machine such that T1 + β> T2 + α, where β is the auxiliary tension that is always loaded. The tension load device can be formed by a brake that suppresses the rotational drive of the take-up machine.

  According to the present invention, even if momentary vibration is propagated to the wire take-up machine due to turbulence or the like on the wire take-up machine side, the auxiliary tension applied to the take-up machine causes the upstream side It is possible to take out with a stable tension with no fluctuation in tension. As a result, the coating of the striate body can be formed with a uniform thickness without abnormality.

It is a figure explaining embodiment of the extrusion coating apparatus and method by this invention. It is a figure explaining other embodiment of the extrusion coating apparatus and method by this invention. It is a figure explaining a prior art and its subject.

  An embodiment of the present invention will be described with reference to FIGS. In the figure, 10 and 10 'are extrusion coating devices, 11 is a linear body, 12 is an extrusion molding machine, 13 is a take-up machine, 13a and 13b are wheels, 14 is a guide roller, 15 is a winding weight, and 16 is winding. , 17 and 17 'are brake devices, 18 is a brake belt, 19 is a brake, and 20 is a brake roller.

  The wire body 11 is an optical fiber cable with an outer sheath or an insulated wire with an insulation coating, and the coating is formed to be controlled to a predetermined thickness by a crosshead of the extruder 12. The coated linear body 11 is cured (not shown) by the coating material, taken up by the take-up machine 13, and transferred to the winder side. The take-up machine 13 can be, for example, a capstan-shaped one consisting of a pair of wheels 13a and 13b, and is driven and controlled so that the upstream side (inlet side) tension T1 is constant. On the downstream side (exit side) of the take-up machine 13, for example, it is taken up by a take-up machine 16 through a guide roller 14 and a take-up weight 15.

  In the present invention, a brake device 17 that suppresses the take-up machine 13 from rotating in the take-up direction is provided. The brake device 17 has, for example, a brake belt 18 that is brought into contact with the wheel 13a on the driving side of the take-up machine 13 and applies a load to the rotation of the wheel 13a. Is loaded. The brake 19 is preferably a powder brake or the like.

  In the above-described extrusion coating apparatus 10, in the normal state, the upstream linear body 11 on which the coating of a predetermined thickness is formed by the extrusion molding machine 12 is taken up by the take-up machine 13 with a constant tension T1, and the downstream side Then, the take-up machine 16 winds up with a tension T2 smaller than the take-up tension T1. However, as described with reference to FIG. 3, when a winding disturbance or the like occurs on the winder 16 side for some reason, a sudden disturbance tension α due to the winding disturbance is generated in the linear body 11, and the vibration caused by this is taken up. Is transmitted to the machine 13. That is, on the outlet side of the take-up machine 13, a tension of T2 + α is instantaneously generated.

  In the take-up machine 13, a change (backlash) is likely to occur in the engagement of the drive gear due to the above-described sudden disturbance tension α. However, a tension load device 17 is added to the take-up machine 13, and even if an instantaneous tension is applied to the wheel 13 a of the take-up machine 13, a load that suppresses this is applied, and the auxiliary tension β due to this is applied. Has occurred. That is, on the inlet side of the take-up machine 13, the tension is T1 + β. Thereby, the relationship between (T1 + β> T2 + α) is maintained between the inlet side and the outlet side of the take-up machine 13, and the tension balance between the inlet side and the outlet side of the take-up machine 13 can be prevented from being reversed.

  For example, when T1 = 200 (N), T2 = 130 (N), α = 100 (N), and β = 200 (N), in the case of a conventional device that does not have the tension load device 17, in the normal time, T1 At> T2, the inlet side tension of the take-up machine 13 is large and stable. However, when a winding disturbance occurs in the winder 16 and a disturbance tension α occurs, the inlet side tension of the take-up machine 13 becomes small at T1 <T2 + α, and backlash occurs. The vibration generated by this is propagated to the extrusion molding machine 12, and bumps are generated in the coating of the linear body 11.

  On the other hand, in the present invention having the tension load device 17, normally, the inlet side tension of the take-up machine 13 is large and stable with T1 + β> T2, but the winding machine 16 is disturbed and the disturbance tension α is Suppose that it occurred. However, even in this case, the tension on the inlet side of the take-up machine 13 is kept large with T1 + β> T2 + α, and the occurrence of backlash is suppressed. Therefore, even if a winding disturbance occurs in the winder 16, no vibration is transmitted to the extrusion molding machine, and it is possible to prevent an abnormality from occurring in the covering molding of the linear body 11.

  FIG. 2 is a view showing another example of the extrusion molding apparatus according to the present invention, and includes a brake device 17 ′ for applying a load for suppressing the take-up machine 13 from rotating in the take-up direction. The other configuration is the same as that described with reference to FIG. The brake device 17 ′, for example, brings the brake roller 20 into contact with the wheel 13 a on the drive side of the take-up machine 13, and an appropriate braking force is always applied to the rotation of the wheel 13 a. The brake roller 20 can be formed of, for example, a rubber tire-like one found in a hand-held unicycle and the like, and is preferably driven using a powder brake or the like.

  In the above-described extrusion coating apparatus 10 ', normally, the upstream linear body 11 on which a coating having a predetermined thickness is formed by the extrusion molding machine 12 is taken up with a constant tension T1 by the take-up machine 13, and the downstream side. On the side, it is wound by the winder 16 with a tension T2 that is smaller than the tension T1 of the take-up. However, as described with reference to FIG. 3, when a turbulence or the like occurs for some reason on the winder 16 side, a sudden disturbance tension α due to the turbulence is generated, and the vibration of the linear body 11 due to this is taken up. Is transmitted to the machine 13. That is, T2 + α tension is generated on the outlet side of the take-up machine 13.

  In the take-up machine 13, as described with reference to FIG. 1, a change in meshing of the drive gear (backlash) is likely to occur due to a rapid fluctuation in tension on the downstream side. However, even if an instantaneous tension is applied to the wheel 13a on the driving side by the tension load device 17 ', the take-up machine 13 is subjected to a load that suppresses this, and an auxiliary tension β is generated thereby. That is, a tension of T1 + β is generated on the inlet side of the take-up machine 13. Thereby, the relationship between (T1 + β> T2 + α) is maintained between the inlet side and the outlet side of the take-up machine 13, and the tension balance between the inlet side and the outlet side of the take-up machine 13 can be prevented from being reversed.

DESCRIPTION OF SYMBOLS 10,10 '... Extrusion coating apparatus, 11 ... Linear body, 12 ... Extruder, 13 ... Take-out machine, 13a, 13b ... Wheel, 14 ... Guide roller, 15 ... Winding weight, 16 ... Winding machine, 17 , 17 '... brake device, 18 ... brake belt, 19 ... brake, 20 ... brake roller.

Claims (3)

An extrusion coating apparatus that performs extrusion coating on the outer periphery of the linear body with an extrusion molding machine, takes up the coated linear body with a take-up machine, and then winds up the linear body after coating with a winding machine,
The inlet side tension of the take-up machine T1, said the exit side tension of the take-off machine and T2, the I Ri rapidly caused disturbance tension to the disturbance of the take-up machine after α, and the auxiliary tension load at all times to the take-up machine β The extrusion coating apparatus is characterized in that a tension load device for the auxiliary tension β is installed in the take-up machine so that T1 + β> T2 + α.   The extrusion coating apparatus according to claim 1, wherein the tension load device is formed by a brake that suppresses rotational driving of the take-up machine. Extrusion coating method in which an outer periphery of a linear body is subjected to extrusion coating by an extrusion molding machine, the coated linear body is taken up by a take-up machine, and then the coated linear body is wound by a winder. Because
The inlet-side tension of the take-up device T1, the the outlet side tension winder and T2, the disturbance tension by Ri rapidly occurring disturbance of the winder after alpha, always by tensioning device installed on the winder An extrusion coating method, wherein T1 + β> T2 + α is set such that the auxiliary tension to be loaded is β.

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