JP2014058112A - Manufacturing device and manufacturing method of cord ply for tire - Google Patents

Abstract

[PROBLEMS] To ensure that the preceding cord ply is stably returned to the upstream side even when the cord ply has a high adhesive strength, ensuring a sufficient amount of overlap, and performing sufficient joining, as well as defects such as wrinkles. An apparatus and a method for manufacturing a cord ply for a tire that does not generate a tire are provided.
SOLUTION: A tire cord ply which is elongated by repeatedly overlapping a trailing edge portion of a preceding cord ply with a leading edge portion of a succeeding cord ply and pressing and joining the overlapping portion. An apparatus for manufacturing a cord ply for a tire, wherein a compressed air is sprayed from below to a rear edge portion of a preceding cord ply on a downstream side of a bonding press device that presses and joins an overlap portion. A tire cord ply manufacturing apparatus provided with a compressed air blowing device configured to lift a rear edge.
[Selection] Figure 1

Description

  The present invention relates to a tire cord ply manufacturing apparatus and manufacturing method used for manufacturing a pneumatic tire.

  In manufacturing a pneumatic tire, a tire cord ply such as a carcass ply or a belt ply is used. Conventionally, such a cord ply for a tire is obtained by bias-cutting a cord ply original fabric produced by coating an unvulcanized rubber on a cord array in which tire cords are arranged in parallel at a predetermined width and angle. It is manufactured by overlapping the non-cut edges of the two cut cord plies, and repeating the joining by pressing the overlap portions (for example, Patent Document 1). .

  A method for manufacturing the above-described conventional tire cord ply will be specifically described with reference to FIG. As shown on the right side of FIG. 3, the long cord ply original fabric 10 unwound from a reel (not shown) moves in the X direction at a predetermined angle with respect to the conveyance direction of the cord ply raw fabric 10 ( In FIG. 1, the cord 20 is bias-cut to a predetermined width by a cutter 20 that moves at right angles to the conveying direction. The cut cord ply 11 is then transported to the cord ply joining device 30 shown on the left side of FIG. 14).

  The joining is performed using a cord ply manufacturing apparatus 30 shown on the left side of FIG. The cord ply manufacturing apparatus 30 includes a belt conveyor 34 that conveys the subsequent cord ply 12 to the bonding presser 36, a bonding presser 36, and a belt conveyor (not shown) that conveys the preceding cord ply 14 that is being elongated. ing.

  When the rear edge portion of the preceding cord ply 14 and the front edge portion of the cord ply 12 are joined by the joining presser 36, the joined cord ply (the integrated cord ply 14 and the cord ply 12) becomes a new leading portion. The cord ply 14 is moved to the section A by a belt conveyor. Then, when the rear edge portion of the new preceding cord ply 14 passes the joining position of the joining presser 36, the conveyance by the belt conveyor is stopped.

  Thereafter, the conveying direction of the belt conveyor is reversed, and the trailing edge of the preceding cord ply 14 is returned in the direction of the section B by the joining overlap amount (usually about 5 mm).

  Next, the cord ply 11 is sent to the section B as the subsequent cord ply 12 and the leading edge portion of the subsequent cord ply 12 is conveyed by the belt conveyor 34 to the joining position of the joining pressing device 36. As a result, the front edge of the subsequent cord ply 12 is overlapped on the rear edge of the preceding cord ply 14.

  Then, this overlap part is pressed and joined by the joining pressing device 36.

  By repeating the above series of operations, the cord ply is elongated and wound on a reel or the like.

JP 2006-21514 A

  However, in the case of the above conventional method for manufacturing a cord ply for a tire, when the preceding cord ply is conveyed in the reverse direction and returned by the joining overlap amount, the adhesive strength of the cord ply is too high, and the preceding cord ply In some cases, the belt conveyor is in close contact and cannot be fully returned. As described above, if the preceding cord ply cannot be sufficiently returned, a defective tire cord ply may be manufactured. That is, since a predetermined overlap amount cannot be ensured, sufficient bonding cannot be performed. In addition, there is a risk of causing problems such as wrinkles in the cord ply.

  Therefore, in view of the above problems, the present invention ensures that the preceding cord ply is stably returned to the upstream side even when the cord ply has a high adhesive force, and a sufficient overlap amount is ensured. It is an object of the present invention to provide a tire cord ply manufacturing apparatus and manufacturing method that perform bonding and do not cause defects such as wrinkles.

The invention described in claim 1
A cord for a tire that produces a tire cord ply that is elongated by overlapping the trailing edge portion of the preceding cord ply with the leading edge portion of the following cord ply and pressing the overlapping portion to join. Ply manufacturing equipment,
On the downstream side of the joining presser that presses and joins the overlap portion, the rear end portion of the preceding cord ply is lifted by blowing compressed air from below to the trailing edge portion of the preceding cord ply. An apparatus for manufacturing a cord ply for a tire is provided with a compressed air blowing device.

The invention described in claim 2
2. The tire cord ply manufacturing apparatus according to claim 1, wherein the compressed air ejection device is a roll disposed in parallel with the overlap portion and provided with a plurality of air ejection ports in a row. is there.

The invention according to claim 3
3. The tire cord ply manufacturing apparatus according to claim 2, wherein the shape of the air outlet is a circle having a diameter of 0.7 to 3.0 mm.

The invention according to claim 4
4. The tire cord ply manufacturing apparatus according to claim 2, wherein the air outlets are provided at intervals of 50 to 100 mm. 5.

The invention described in claim 5
The tire roll ply manufacturing apparatus according to any one of claims 2 to 4, wherein the roll is made of metal.

The invention described in claim 6
The tire cord ply manufacturing apparatus according to any one of claims 2 to 5, wherein the roll is disposed at a position within 100 mm on the downstream side of the bonding pressing device.

The invention described in claim 7
A tire cord ply manufacturing method using the tire cord ply manufacturing apparatus according to any one of claims 1 to 6,
A preceding code ply conveying step of conveying the trailing edge of the preceding cord ply until it passes the bonding position of the bonding pressing device;
A preceding cord ply return step for returning the trailing edge portion of the preceding cord ply conveyed until it passes through the joining position of the joining presser device by a distance necessary to form the overlap portion at the position of the joint presser device. When,
An overlap portion forming step of transporting the leading edge portion of the subsequent cord ply to the bonding position of the bonding pressing device and forming an overlap portion with the trailing edge portion of the preceding cord ply;
And an overlap portion joining step for joining the overlap portion by pressing the overlap press device.
The preceding cord ply returning step is a step in which compressed air is sprayed from below to the rear edge portion of the preceding cord ply, and the trailing edge portion of the preceding cord ply is lifted and returned. It is a manufacturing method of the cord ply for use.

The invention according to claim 8 provides:
The tire cord ply manufacturing method according to claim 7, wherein the pressure of the compressed air in the preceding cord ply returning step is 0.05 to 0.10 MPa.

  According to the present invention, in view of the above problems, even when the cord ply has a high adhesive strength, the preceding cord ply is reliably and stably returned to the upstream side, and a sufficient overlap amount is ensured. It is possible to provide a tire cord ply manufacturing apparatus and a manufacturing method that perform bonding and do not cause defects such as wrinkles.

It is a schematic sectional drawing explaining the manufacturing apparatus of the cord ply for tires which concerns on this invention. It is a schematic plan view of a roll. It is a schematic diagram explaining the manufacturing method of the conventional cord ply for tires.

  Hereinafter, the present invention will be specifically described based on embodiments.

1. Tire Cord Ply Manufacturing Device First, a tire cord ply manufacturing device will be described. FIG. 1 is a schematic cross-sectional view for explaining a tire cord ply manufacturing apparatus according to the present invention.

  As shown in FIG. 1, the cord ply manufacturing device 30 joins the rear edge portion of the preceding cord ply 14 and the front edge portion of the succeeding cord ply 12 in the middle of lengthening by the joining pressing device 36.

  The cord ply manufacturing apparatus 30 includes a belt conveyor 32, 34, a bonding pressing device 36 disposed at a boundary portion between the carry-out side (downstream side) section A and the carry-in side (upstream side) section B, and the bonding press apparatus 36. And a roll 38 provided with an outlet for compressed air on the cord ply side.

  As shown in FIG. 1, the roll 38 is disposed in a direction orthogonal to the code ply transport direction. As shown in FIG. 2, the roll 38 is provided with a plurality of air ejection ports 40 through which compressed air is ejected.

  By causing the compressed air to be ejected from the air ejection port 40 of the roll 38 to the rear edge portion of the preceding cord ply 14, the rear edge portion of the preceding cord ply 14 is lifted. As a result, even when the adhesive strength of the cord ply is high, the preceding cord ply can be reliably returned to the upstream side, a sufficient overlap amount can be ensured, and sufficient joining can be performed. In addition, occurrence of defects such as wrinkles can be reduced.

2. Manufacturing method of tire cord ply Next, a manufacturing method of a tire cord ply using the above-described manufacturing apparatus will be described with reference to FIG.

  The operation until the rear edge portion of the preceding cord ply 14 passes the joining position of the joining presser 36 is the same as the conventional one.

  That is, when the trailing edge of the preceding cord ply 14 passes the joining position of the joining presser 36, the conveyance by the belt conveyor 32 is temporarily stopped.

  Next, in the preceding cord ply returning step, compressed air is ejected from the air ejection port 40 of the roll 38, blown to the rear edge portion of the preceding cord ply 14, and the trailing edge portion is lifted. Pull apart. Next, the preceding cord ply 14 is returned to the carry-in side section B side by an overlap amount, specifically about 5 mm.

  Next, the succeeding cord ply 12 is carried into the joining position of the joining presser 36, the front edge portion of the succeeding cord ply 12 is overlapped with the trailing edge portion of the preceding cord ply 14, and the succeeding cord ply 12 is conveyed. Stop.

  Next, the joining pressing device 36 is operated to join the rear edge portion of the preceding cord ply 14 and the front edge portion of the succeeding cord ply 12.

  By repeating this series of steps, the length is increased and a tire cord ply is manufactured. The manufactured tire cord ply is wound on a reel and sent to the next process.

  As described above, in the present embodiment, in the preceding cord ply return step, the compressed air is ejected from the air ejection port 40 of the roll 38, and the trailing edge portion is sprayed from below on the rear edge portion of the preceding cord ply 14. After the preceding cord ply 14 is pulled away from the belt conveyor 32, the control device is operated to return the leading cord ply 14 to the carry-in section B side by a predetermined overlap amount. As a result, when the cord ply is joined, even if the cord ply has a high adhesive strength, the preceding cord ply can be reliably and stably returned to the upstream side by a predetermined overlap amount, and sufficient joining can be performed. . In addition, it is possible to manufacture a cord ply that is free from defects such as wrinkles that occur when the preceding cord ply is in close contact with the belt conveyor and cannot return.

  In the present embodiment, the roll 38 is used as a means for ejecting compressed air. However, the present invention is not limited to this, and any means for ejecting compressed air can be used.

3. Next, the compressed air ejection from the roll will be described in detail.

  As described above, the compressed air is ejected from the plurality of air ejection ports 40 provided in a row on the roll 38 shown in FIG. As a result, the trailing edge of the preceding cord ply 14 is reliably lifted. In order to save energy, it is preferable that the compressed air is ejected intermittently and only during the preceding code ply returning step.

  The air outlet 40 is preferably circular with a diameter of 0.7 to 3.0 mm. When the diameter is less than 0.7 mm, the force for lifting the trailing edge of the preceding cord ply 12 is weak, and the effect is low. When the diameter exceeds 3.0 mm, the force for lifting the trailing edge of the preceding cord ply 14 is too strong, and the leading cord ply 14 may be displaced from a predetermined position.

  Moreover, it is preferable that the space | interval of the air ejection opening 40 is 50-100 mm. When the distance is less than 50 mm, the force for lifting the trailing edge of the preceding cord ply 12 is too strong, and the leading cord ply 14 may be displaced from a predetermined position. When the distance exceeds 100 mm, the force for lifting the trailing edge of the preceding cord ply 14 is weak, and the effect is low.

  Moreover, it is preferable that the roll 38 is arrange | positioned in the position within 100 mm in the downstream from the joining pressing device 36. FIG. When it exceeds 100 mm, the force to lift the trailing edge of the preceding cord ply 14 is weak and the effect is low.

  The roll 38 is a long cylindrical tube having a circular cross section, and is preferably made of metal (such as steel or aluminum).

  In addition, it is preferable that the pressure of compressed air is 0.05-0.10 Mpa. When the air pressure is less than 0.05 MPa, the force to lift the trailing edge of the preceding cord ply 14 is weak, and the effect is low. When the air pressure exceeds 0.10 Mpa, the force to lift the trailing edge of the preceding cord ply 14 is too strong, and the leading cord ply 14 may be displaced from a predetermined position.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

10 Code ply stock 11, 12 Subsequent code ply
14 Leading cord ply 20 Cutter 30 Cord ply manufacturing device 32, 34 Belt conveyor 36 Bonding pressing device 38 Roll 40 Air outlet A Unloading side (downstream side) B Loading side (upstream side) zone

Claims (8)

A cord for a tire that produces a tire cord ply that is elongated by overlapping the trailing edge portion of the preceding cord ply with the leading edge portion of the following cord ply and pressing the overlapping portion to join. Ply manufacturing equipment,
On the downstream side of the joining presser that presses and joins the overlap portion, the rear end portion of the preceding cord ply is lifted by blowing compressed air from below to the trailing edge portion of the preceding cord ply. An apparatus for manufacturing a cord ply for a tire, wherein a compressed air blowing device is provided.   2. The tire cord ply manufacturing apparatus according to claim 1, wherein the compressed air blowing device is a roll disposed in parallel with the overlap portion and provided with a plurality of air blowing ports in a row.   The tire cord ply manufacturing apparatus according to claim 2, wherein the shape of the air outlet is a circle having a diameter of 0.7 to 3.0 mm.   4. The tire cord ply manufacturing apparatus according to claim 2, wherein the air outlets are provided at an interval of 50 to 100 mm.   The tire cord ply manufacturing apparatus according to any one of claims 2 to 4, wherein the roll is made of metal.   6. The tire cord ply manufacturing apparatus according to claim 2, wherein the roll is disposed at a position within 100 mm on the downstream side of the bonding pressing device. 7. A tire cord ply manufacturing method using the tire cord ply manufacturing apparatus according to any one of claims 1 to 6,
A preceding code ply conveying step of conveying the trailing edge of the preceding cord ply until it passes the bonding position of the bonding pressing device;
A preceding cord ply return step for returning the trailing edge portion of the preceding cord ply conveyed until it passes through the joining position of the joining presser device by a distance necessary to form the overlap portion at the position of the joint presser device. When,
An overlap portion forming step of transporting the leading edge portion of the subsequent cord ply to the bonding position of the bonding pressing device and forming an overlap portion with the trailing edge portion of the preceding cord ply;
And an overlap portion joining step for joining the overlap portion by pressing the overlap press device.
The preceding cord ply returning step is a step in which compressed air is sprayed from below to the rear edge portion of the preceding cord ply, and the trailing edge portion of the preceding cord ply is lifted and returned. Manufacturing method for cord ply.   The tire cord ply manufacturing method according to claim 7, wherein the pressure of the compressed air in the preceding cord ply returning step is 0.05 to 0.10 MPa.

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