JP2014058114A - Joining device and joining method of cord ply for tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining device and a joining method of cord plies for tire that without need for securing a large amounts of rubbers between cords and need for pre-cutting both edges of cord plies, can manufacture with high productivity tires with superior high speed uniformity, by surely joining even cord plies with a small overlapped part.SOLUTION: A joining device of cord plies for tire comprises: an ascending/descending member in which a plurality of needle-shaped protrusions are arranged at predetermined intervals along a width direction of two cord plies having a cord-arrayed body where cords are parallely arrayed and unvulcanized rubber is coated on them; and ascending/descending means that keeps sticking the needle-shaped protrusions to an overlapped part until end portions of the needle-shaped protrusions pass through the overlapped part, descends the ascending/descending member so that unvulcanized rubber of one cord ply enters into the another cord ply, and then ascends the ascending/descending member so as to pull out the stuck needle-shaped protrusions from the overlapped part.

Description

  The present invention relates to a tire cord ply joining apparatus and joining method.

  In the cord ply biasing step in the tire manufacturing process, a cord ply in which cords are arranged in parallel and a cord ply in which unvulcanized rubber is coated is cut to a predetermined width at a predetermined angle, and then cut 2 Each edge (edge) of the cord ply of a sheet is joined and lengthened (for example, patent document 1, patent document 2).

  As such a joining method, conventionally, the following overlap joint method, zipper joint method, and butt joint method are employed.

  The overlap joint method is a method in which an overlap portion in which the edges of two cord plies are vertically overlapped is directly bonded in the vertical direction at once.

  The zipper joint method is a method in which the zipper is closed and bonded in order from one end to the other end of the overlap portion where the edges of the two cord plies are stacked one above the other.

  The butt joint method is a method in which the end surfaces of the edge portions of the two cord plies are butted together and pressed in the butting direction as they are to join the end surfaces.

JP 2010-42571 A JP 2010-1111082 A

  However, these joining methods have the following problems.

  That is, in the overlap joint method, when joining is performed with the overlap portion being less than 3 mm, a sufficient joining force cannot be maintained and the joining portion may open during inflation. For this reason, in order to employ | adopt an overlap joint system and to maintain sufficient joining force, it is necessary to set an overlap part as large as 3-5 mm.

  However, when such a large overlap portion is set, the joint portion becomes large in the cord ply after joining, which may deteriorate the high-speed uniformity of the tire and cause problems such as vibration. For this reason, there is a case where the overlap joint method cannot be adopted for joining the cord ply of a specific tire that requires high performance.

  Next, in the zipper joint method, the overlap portion can be made smaller than in the overlap joint method, but a certain amount of rubber is required between the cords in order to perform reliable bonding. For this reason, in the manufacture of passenger car tires using cord plies with thin gauges, it has been difficult to adopt the zipper joint method for cord ply joining.

  And the apparatus used for a zipper joint system becomes a complicated structure compared with an overlap joint system, and requires delicate adjustment of an apparatus. Furthermore, the number of maintenance and troubles of the device increases, and the productivity is greatly reduced compared to the overlap joint method.

  In addition, since high accuracy is required for the work of sequentially joining from one end of the small overlap portion to the other end, the amount of rubber needs to be small and constant at the edge, and before joining In some cases, both edges had to be cut in advance.

  In this case, the productivity is further reduced due to an increase in the work of cutting both edges, and extra costs are incurred for discarding the waste rubber by the cutting.

  Next, since the butt joint method does not provide an overlap portion, like the zipper joint method, a certain amount of rubber is required between the cords in order to perform reliable bonding. For this reason, in the manufacture of passenger car tires using cord plies with thin gauges, it has been difficult to adopt the butt joint method for joining cord plies.

  Therefore, in view of the above, the present invention eliminates the need to secure a large amount of rubber between the cords and the need to cut both edges of the cord ply in advance. It is an object of the present invention to provide a tire cord ply joining apparatus and joining method capable of joining a cord ply with a high strength and manufacturing a tire with excellent high-speed uniformity with high productivity.

The invention described in claim 1
A cord ply joining apparatus for tires that joins each edge of two cord plies coated with unvulcanized rubber to a cord array in which cords are arranged in parallel, and lengthens the cord plies.
A lifting member in which a plurality of needle-like protrusions are arranged at a predetermined interval so as to follow the width direction of the two cord plies,
The needle-like protrusion is pierced into the overlap part until the tip part of the needle-like protrusion penetrates the overlap part, and the lifting / lowering is performed so that the unvulcanized rubber of one cord ply enters the other cord ply. An apparatus for joining a cord ply for a tire, comprising: a lifting / lowering means for lowering the member and then lifting the lifting / lowering member so as to pull out the pierced needle-like projection from the overlap portion. .

The invention described in claim 2
2. The tire cord ply joining device according to claim 1, wherein the needle-like protrusions are made of a circular metal member having a cross-sectional shape of a diameter of 1 to 2 mm.

The invention according to claim 3
3. The tire cord ply joining device according to claim 1, wherein an interval between the arranged needle-like protrusions is 2 to 4 mm. 4.

The invention according to claim 4
The pressure receiving member provided with the recessed part space which receives the front-end | tip part of the said acicular protrusion which penetrated the said overlap part was provided in the lower layer side of the said overlap part. The tire cord ply joining device according to any one of the above.

The invention described in claim 5
5. A columnar stopper for adjusting a descending amount of the elevating member is provided at both ends of the array of the plurality of needle-like protrusions provided on the elevating member. It is a joining apparatus of the cord ply for tires given in any 1 paragraph.

The invention described in claim 6
A cord ply joining apparatus for tires that joins each edge of two cord plies coated with unvulcanized rubber to a cord array in which cords are arranged in parallel, and lengthens the cord plies.
An elevating member in which a plurality of needle-like protrusions having flat front ends are arranged at predetermined intervals so as to extend along the width direction of the two cord plies,
The needle-like protrusion is pierced into the overlap part so that the tip part of the needle-like protrusion does not penetrate the overlap part, and the cord of one cord ply is inserted between the cords of the other cord ply. An apparatus for joining a cord ply for tire, comprising: elevating means for elevating the elevating member so as to lower the elevating member and then pulling out the pierced needle-like protrusion from the overlap portion It is.

The invention described in claim 7
7. The tire cord ply joining device according to claim 6, wherein the flat surface is a circular surface having a diameter of 0.3 to 0.5 mm.

The invention according to claim 8 provides:
8. The positioning device according to claim 6, further comprising a positioning unit that detects irregularities on the surface of the cord ply by laser scanning and controls a position of the cord ply that pierces the needle-like projection. This is a tire cord ply joining apparatus.

The invention according to claim 9 is:
A method of joining a tire cord ply, in which each edge portion of two cord plies coated with unvulcanized rubber is joined to a cord array in which cords are arranged in parallel, and is elongated.
An overlapping step of overlapping each edge of the two cord plies to form an overlap portion;
The tip of the plurality of needle-like protrusions arranged at a predetermined interval along the width direction of the cord ply penetrates the overlap part until the tip part penetrates the overlap part, A needle-like protrusion piercing step for allowing unvulcanized rubber of the cord ply to enter the other cord ply;
A method of joining a cord ply for a tire, comprising: a needle-like projection extracting step of extracting the pierced needle-like projection from the overlap portion.

The invention according to claim 10 is:
A method of joining a tire cord ply, in which each edge portion of two cord plies coated with unvulcanized rubber is joined to a cord array in which cords are arranged in parallel, and is elongated.
An overlapping step of overlapping each edge of the two cord plies to form an overlap portion;
A plurality of needle-like projections arranged at predetermined intervals along the width direction of the cord ply and having a flat tip end pierce the overlap portion so as not to penetrate the overlap portion. A needle-like protrusion piercing step for allowing the cord of one cord ply to enter between the cords of the other cord ply;
A method of joining a cord ply for a tire, comprising: a needle-like projection extracting step of extracting the pierced needle-like projection from the overlap portion.

The invention according to claim 11
11. The tire cord ply joining method according to claim 9, wherein a size of the overlap portion is one or two cords in each cord ply.

  According to the present invention, there is no need to secure a large amount of rubber between the cords, and it is not necessary to cut both edges of the cord ply in advance. It is possible to provide a tire cord ply joining device and joining method capable of joining a ply and manufacturing a tire with excellent high-speed uniformity with high productivity.

It is drawing which shows 1st Embodiment of the joining apparatus of the cord ply for tires which concerns on this invention, (A) is a schematic side view, (B) is a schematic front view. It is a principal part expanded side view which shows the modification of the joining apparatus shown in FIG. It is a schematic side view which shows another modification of the joining apparatus shown in FIG. It is drawing for demonstrating the joining method of the cord ply for tires using the joining apparatus shown in FIG. 1, (A) is a schematic side view, (B) is a schematic front view, (C) is a principal part enlarged front view. FIG. (A)-(E) are the principal part expansion front views which show 2nd Embodiment of the joining apparatus and joining method of the cord ply for tires which concern on this invention.

  DESCRIPTION OF EMBODIMENTS Embodiments of a tire cord ply joining device and joining method according to the present invention will be described below with reference to the drawings.

1. First Embodiment (1) Configuration of Joining Device for Tire Cord Ply FIG. 1 is a drawing showing a first embodiment of a joining device for a cord ply for tire according to the present invention, and FIG. A schematic side view and (B) are schematic front views.

  The joining apparatus 1 is an apparatus that manufactures a long carcass ply or the like by repeating overlapping and joining the edges of two cord plies.

  As shown in FIG. 1, the joining device 1 includes an elevating member 2 provided with a plurality of needle-like protrusions 3, an actuator 4 that is an elevating member driving means, and two cord plies 11 and 12. And a belt conveyor (not shown) for forming the overlap portion 13 by being conveyed below. FIG. 1 also shows a position sensor 17 that detects the positions of the cord plies 11 and 12 that have been transported in the transport direction X by the belt conveyor.

  The raising / lowering member 2 is arrange | positioned above the overlap part 13 of the cord plies 11 and 12 conveyed by the belt conveyor. The plurality of needle-like protrusions 3 provided on the lower surface of the elevating member 2 are arranged in a line at a predetermined interval so as to follow the overlap portion 13, that is, the width direction Y of the cord ply.

  The needle-like protrusion 3 penetrates and penetrates the overlap portion 13 of the upper layer cord ply 11 and the lower layer cord ply 12 so that the edges of the upper layer cord ply 11 and the lower layer cord ply 12 are joined to each other. The That is, the needle-like protrusion 3 is pierced into the overlap part 13 until the tip part of the needle-like protrusion 3 penetrates the overlap part 13, and the unvulcanized rubber of the upper cord ply 11 enters the lower cord ply 12. Thereby, joining in the overlap part 13 is performed. The pierced needle-like protrusion 3 is then pulled out from the overlap portion 13 to complete the joining.

  The needle-like protrusion 3 is a circular metal member having a cross-sectional shape of 1 to 2 mm in diameter, and the tip of the needle-like protrusion 3 has a conical shape with an acute angle. When a circular metal member having a diameter of the needle-like protrusion 3 of less than 1 mm or more than 2 mm is used, the bonding force of the overlap portions 13 of the cord plies 11 and 12 is reduced. Moreover, the mutual space | interval of the acicular protrusion 3 is 2-4 mm. When the interval between the needle-like protrusions 3 is less than 2 mm or more than 4 mm, the bonding force of the overlap portions 13 of the cord plies 11 and 12 is reduced.

  The actuator 4 is disposed above the elevating member 2 and moves the elevating member 2 in the vertical direction Z.

  The position sensor 17 is disposed in the vicinity of the elevating member 2 and determines the position of the terminal edge 11a of the cord ply 11 and the position of the leading edge 12a of the cord ply 12 that have been conveyed in the conveying direction X by the belt conveyor. By detecting, the overlap portion 13 is formed with a predetermined overlap amount L.

  As shown in FIG. 2, the bonding device further includes a pressure receiving member 5 in which a recessed space 50 is provided on the lower layer side of the overlap portion 13 to receive the tip of the needle-like protrusion that penetrates the overlap portion 13. It is preferable that it is provided. Thereby, while protecting the front-end | tip part of the acicular protrusion 3 which penetrated the overlap part 13, it is prevented that a bending generate | occur | produces in the overlap part 13 by supporting the overlap part 13 from the lower side, and it is acicular. The tip portion of the protrusion 3 can be reliably passed through the overlap portion 13.

  Also, columnar metal stoppers 6a and 6b are preferably provided at both ends of the array of the plurality of needle-like protrusions 3 provided on the elevating member 2, as shown in FIG. As a result, as shown in FIG. 3B, the needle-like protrusion 3 is prevented from penetrating the overlap portion 13 of the cord plies 11 and 12 more than necessary, and the needle-like protrusion 3 is subsequently pulled out. The cord plies 11 and 12 can be prevented from being pulled up together with the needle-like protrusions 3.

At this time, in order to prevent the stoppers 6a and 6b from penetrating the cord ply 12, it is preferable that the contact area of the stoppers 6a and 6b with respect to the cord ply is a certain value or more, specifically, 2 mm ² or more.

(2) Method of Joining Tire Cord Ply Next, a method of joining the tire cord ply using the joining device described above will be described with reference to FIGS. 1 and 4.

  FIG. 4 is a drawing for explaining a method for joining tire cord plies using the joining apparatus shown in FIG. 1, (A) is a schematic side view, (B) is a schematic front view, and (C) is a schematic view. It is a principal part enlarged front view.

  As shown in FIG. 1B, the preceding code ply 11 has been conveyed in the conveying direction X on the belt conveyor, and the position sensor 17 indicates that the rear end edge portion 11a of the cord ply 11 has reached a predetermined position. Is detected, the conveyance of the cord ply 11 is stopped.

  Next, the cord ply 12 is transported in the transport direction X on the belt conveyor so that the starting end edge portion 12a of the succeeding cord ply 12 is positioned on the rear end edge portion 11a of the preceding cord ply 11. When the position sensor 17 detects that the starting edge 12a has reached a predetermined position, the conveyance of the cord ply 12 is stopped. Thereby, the overlap part 13 in which the rear end edge part 11a of the cord ply 11 and the start end edge part 12a of the cord ply 12 overlap each other is formed.

  At this time, the overlap amount L of the overlap portion 13 is preferably 1 to 2 cords (about 1 to 2 mm) constituting the cord plies 11 and 12.

  Next, as shown in FIGS. 4A and 4B, the elevating member 2 is lowered in the vertical direction by the actuator 4, and the tip portions of the plurality of needle-like protrusions 3 provided on the elevating member 2 are overlapped. 13 is penetrated from the upper layer cord ply 12 side.

  At this time, as shown in FIG. 4 (C), the tip of each needle-like protrusion 3 is used to convert a part 12 a of the unvulcanized rubber of the upper cord ply 12 into the unvulcanized rubber of the lower cord ply 11. Since it pushes and invades, even if it is the small overlap part 13, the two cord plies 11 and 12 can be joined firmly.

  In addition, there is no need to secure a large amount of rubber between the cords and to cut both edges of the cord ply in advance when joining.

  After the joining is completed, the elevating member 2 is raised in the vertical direction by the actuator 4, and the needle-like protrusion 3 is pulled out from the overlap portion 13.

  Thereafter, the joined cord plies 11 and 12 are conveyed until the terminal sensor detects the terminal edge of the upper cord ply 12 by the belt conveyor. Thereafter, the series of operations described above are repeated, and the cord ply is lengthened.

2. 2. Second Embodiment (1) Configuration of Tire Cord Ply Joining Device FIG. 5 is an enlarged front view of an essential part showing a second embodiment of a tire cord ply joining device.

  The joining device 21 according to the second embodiment is for detecting that the tip shape of the needle-like projection 23 provided on the elevating member 2 is a flat surface and minute irregularities on the surface of the upper cord ply 12. Except that the laser scan sensor 28 is provided, the present embodiment is the same as the bonding apparatus 1 of the first embodiment, and only the portions different from the first embodiment will be described below.

  As shown in FIG. 5, the needle-like protrusion 23 in the present embodiment has a tip 23a formed on a flat surface having a diameter of 0.3 to 0.5 mm.

  The laser scan sensor 28 is provided in the vicinity of the elevating member, and detects the position of the cord 15 constituting the cord ply 12 by detecting minute irregularities on the surface of the upper layer cord ply 12.

(2) Joining Method of Tire Cord Ply Next, a method of joining the tire cord ply using the joining device 21 will be described.

  First, the overlap portion 13 is formed in the same manner as in the first embodiment. At this time, as shown in FIG. 5A, the laser scan sensor 28 detects minute irregularities appearing on the surface of the upper layer cord ply 12, and detects the position of the cord 15 constituting the upper layer cord ply 12. .

  Next, as shown in FIG. 5B, the tip of the needle-like protrusion 23 is caused to enter from the upper side of the cord ply 12 of the overlap portion 13 in the same manner as in the first embodiment. Then, as shown in FIG. 5C, the cord 15 detected based on the detection result of the laser scan sensor 28 is pushed into the lower cord ply 11 side by the tip of the needle-like projection 23.

  In the present embodiment, the needle-like protrusion 23 does not penetrate the overlap portion 13, and the cord 15 that is pushed in is two adjacent cords 14 of the cord ply 11 as shown in FIG. , 14 and the interval is pushed wide to join the overlap portion 13. Thereafter, as shown in FIG. 5E, the needle-like protrusion 23 is pulled out from the overlap portion 13.

  As a result, in the present embodiment, as compared with the conventional joining, the joining of the cord 15 of the upper layer cord ply 12 and the cord 14 of the lower layer cord ply 11 is relaxed. Thereby, at the time of shape-up, the variation in the binding force due to the cord is alleviated, defects such as bulgedents are improved, and high-speed uniformity is also improved.

3. Advantages of Embodiment (1) In the above, the uncured rubber of the upper cord ply penetrates into the lower cord ply by piercing until the tip of the needle-like protrusion penetrates the overlap portion, or the upper cord Since the cord of the ply is intruded between the cords of the lower cord ply, it is reliable even if the size of the overlap part (overlap amount) is reduced to one or two cords (about 1-2 mm) The cord ply can be joined with a stable strength, and a tire excellent in high-speed uniformity can be manufactured.

(2) Further, when joining, there is no need to secure a large amount of rubber between the cords or to cut both edges of the cord ply in advance.

  In the following, the joining situation was evaluated by joining the edges of two cord plies with different overlap amounts and performing a tensile evaluation.

1. Specimen Using two cord plies with a size of 525 mm x 1450 mm x 0.95 mm (thickness) (1450 cords), as shown in Table 1, less than 3 mm (1 to 2 cords), 3 mm or more (cord 3 The test specimens were joined with an overlap amount of at least this). In addition, the test body which cut and joined both edges was also prepared for the test body of less than 3 mm.

2. Joining method As a joining method, the joining method based on the first embodiment (Example), the joining method using the conventional overlap joint method (Comparative Example 1), and the joining method using the zipper joint method (Comparative Example 2) are adopted. did.

3. Evaluation method Assuming inflation, each test specimen was pulled with a tensile shearing machine (shearing force: 50 N / mm ² ), and the occurrence of disconnection of the bonded portion was evaluated. In addition, evaluation was performed as follows (N = 10) according to generation | occurrence | production of the detachment | attachment of a junction part.
(Double-circle): The joining part did not come off.
Δ: Detachment of the joint occurred in 1 to 9 samples.
X: Detachment of the joint occurred in all 10 samples.

4). Evaluation results The results are shown in Table 1.

  From Table 1, it can be seen that in the overlap joint method (Comparative Example 1), when the overlap amount is less than 3 mm (1 to 2 cords), the bonding force is reduced, and when inflated, the bonded portion comes off. .

  In the zipper joint method (Comparative Example 2), when both edges of the cord ply are cut and joined with an overlap amount of less than 3 mm (one or two cords), there is no problem, but both edges are not cut. Has too much rubber on both edges (or there is a part where the amount of rubber on both edges is not constant), so it is not possible to form a sufficient zipper joint (joint), and if it is inflated, the joint may be detached I understand that there is.

  On the other hand, in an Example, even if it is a small overlap amount which made the overlap amount 1 or 2 cords, it turns out that it was able to join with the stable intensity | strength reliably. It can also be seen that a sufficient joint can be formed without cutting both edges.

  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.

DESCRIPTION OF SYMBOLS 1, 21 Joining device 2 Lifting member 3, 23 Needle-like protrusion 4 Actuator 5 Pressure receiving member 6a, 6b Stopper 11, 12 Cord ply 11a End edge part of cord ply 11 12a Start edge part of cord ply 12 13 Overlap part 14, 15 Code 17 Position sensor 28 Laser scan sensor 50 Recessed space X Code ply conveying direction Y Code ply width direction Z Elevating member lifting direction

Claims (11)

A cord ply joining apparatus for tires that joins each edge of two cord plies coated with unvulcanized rubber to a cord array in which cords are arranged in parallel, and lengthens the cord plies.
A lifting member in which a plurality of needle-like protrusions are arranged at a predetermined interval so as to follow the width direction of the two cord plies,
The needle-like protrusion is pierced into the overlap part until the tip part of the needle-like protrusion penetrates the overlap part, and the lifting / lowering is performed so that the unvulcanized rubber of one cord ply enters the other cord ply. An apparatus for joining a cord ply for tire, comprising: elevating means for elevating the elevating member so as to lower the member and then pull out the pierced needle-like protrusion from the overlap portion.   2. The tire cord ply joining apparatus according to claim 1, wherein the needle-like protrusions are made of a circular metal member having a cross-sectional shape of a diameter of 1 to 2 mm.   3. The tire cord ply joining device according to claim 1, wherein a distance between the arranged needle-like protrusions is 2 to 4 mm. 4.   The pressure receiving member provided with the recessed part space which receives the front-end | tip part of the said acicular protrusion which penetrated the said overlap part was provided in the lower layer side of the said overlap part. The joining apparatus of the cord ply for tires of any one of these.   5. A columnar stopper for adjusting a descending amount of the elevating member is provided at both ends of the array of the plurality of needle-like protrusions provided on the elevating member. The joining apparatus of the cord ply for tires of any one of Claims. A cord ply joining apparatus for tires that joins each edge of two cord plies coated with unvulcanized rubber to a cord array in which cords are arranged in parallel, and lengthens the cord plies.
An elevating member in which a plurality of needle-like protrusions having flat front ends are arranged at predetermined intervals so as to extend along the width direction of the two cord plies,
The needle-like protrusion is pierced into the overlap part so that the tip part of the needle-like protrusion does not penetrate the overlap part, and the cord of one cord ply is inserted between the cords of the other cord ply. An apparatus for joining a cord ply for tire, comprising: elevating means for elevating the elevating member so as to lower the elevating member and then pulling out the pierced needle-like protrusion from the overlap portion .   7. The tire cord ply joining apparatus according to claim 6, wherein the flat surface is a circular surface having a diameter of 0.3 to 0.5 mm.   8. The positioning device according to claim 6, further comprising a positioning unit that detects irregularities on the surface of the cord ply by laser scanning and controls a position of the cord ply that pierces the needle-like projection. Tire cord ply joining device. A method of joining a tire cord ply, in which each edge portion of two cord plies coated with unvulcanized rubber is joined to a cord array in which cords are arranged in parallel, and is elongated.
An overlapping step of overlapping each edge of the two cord plies to form an overlap portion;
The tip of the plurality of needle-like protrusions arranged at a predetermined interval along the width direction of the cord ply penetrates the overlap part until the tip part penetrates the overlap part, A needle-like protrusion piercing step for allowing unvulcanized rubber of the cord ply to enter the other cord ply;
A method for joining a cord ply for a tire, comprising: a needle-like projection extracting step of extracting the pierced needle-like projection from the overlap portion. A method of joining a tire cord ply, in which each edge portion of two cord plies coated with unvulcanized rubber is joined to a cord array in which cords are arranged in parallel, and is elongated.
An overlapping step of overlapping each edge of the two cord plies to form an overlap portion;
A plurality of needle-like projections arranged at predetermined intervals along the width direction of the cord ply and having a flat tip end pierce the overlap portion so as not to penetrate the overlap portion. A needle-like protrusion piercing step for allowing the cord of one cord ply to enter between the cords of the other cord ply;
A method for joining a cord ply for a tire, comprising: a needle-like projection extracting step of extracting the pierced needle-like projection from the overlap portion.   The method for joining tire cord plies according to claim 9 or 10, wherein the size of the overlap portion is one or two cords in each cord ply.

Images