JP2010111082A - Device and method for joining cord ply for tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for joining cord plies for a tire which can provide a cord ply excellent in TFV (Tractive force variation) for high-speed uniformity by certainly joining at a small overlapped part even if the cord plies have thin gauges, and maintain high productivity. <P>SOLUTION: The device for joining includes a first pressing means 7 and a second pressing means 6 facing each other wherein pressing members are arranged at the upper side and pressure receiving members are arranged in the lower part, and the pressing members and the pressure receiving members face each other. Meshing claws 9a, 9b, 10a, 10b which can be meshed with one another are formed so as to face each other in each pressing member and each pressure receiving member. In a state that the first pressing member is lowered to apply a pressing force to a cord ply on the upper surface of the first pressure receiving member in the first pressing means and the second pressing member is lowered to apply the pressing force to an overlapped part of two cord plies on the upper surface of the second pressure receiving member in the second pressing means, the second pressing member and the second pressure receiving member move to the side of the first pressing means so that the meshing claws are meshed, whereby the overlapped part of the two cord plies is applied with a shearing force. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cord ply joining device and joining method for tires.

  The cord ply in which the cord array in which the cords are arranged in parallel is covered with the unvulcanized rubber is lengthened by repeating the joining of the side edges of the two cord plies, and the tire carcass ply Etc. are used.

  And as a typical method of this joining, there are the following overlap joint method, zipper joint method, and butt joint method (Patent Document 1).

  The overlap joint method is a method in which the side edge portions of two cord plies are sufficiently overlapped to form an overlap portion, and the entire overlap portion is bonded by pressing from above and below at once. Since it is a simple method that the joining is completed simply by crimping the overlap part, it does not require complicated equipment and is characterized by high productivity. Mainly, the gauge is thin and the rubber between the cords Used for cord plies for passenger car tires with a small amount.

  In the zipper joint method, the side edges of the two cord plies are slightly overlapped to form an overlap, and the zipper is closed in order so that the zipper is closed from one end of the overlap to the other. And joining them. Compared to the overlap joint method, the overlap portion can be made smaller, for example, 1 to 2 mm, so that the joint portion can be made smaller in the cord ply after joining, and TFV (Tracive force variation) of high-speed uniformity. The characteristic is that an excellent tire can be obtained. Therefore, the zipper joint method is mainly used for a cord ply of a truck bus tire having a thick gauge and a large amount of rubber between cords.

The butt joint system is a system in which the end surfaces of the side edge portions of the two cord plies are butted together and pressed in the butting direction. Since there is no need to provide an overlap part, the joint part can be made small in the cord ply after joining, similar to the zipper joint system, and thus there is a feature that a tire excellent in high-speed uniformity TFV can be obtained. Therefore, the butt joint method is used for steel cord plies of truck bus tires with a large amount of rubber.
JP 2001-105508 A

  However, in the overlap joint method, in order to perform reliable joining, it is necessary to set the overlap portion large, for example, 4 to 8 mm. As a result, the joint portion becomes large in the cord ply after joining, the TFV of the high-speed uniformity of the tire is deteriorated, and problems such as vibration may occur. For this reason, there is a case where the overlap joint method cannot be adopted for joining the cord ply of a specific tire.

  To prevent the high-speed uniformity from adversely affecting the TFV, if the overlap portion is set to a small size, for example, 1 to 2 mm, and crimping is performed in the same manner as in the past, a portion where no code is present occurs, There is a risk of forming a weak joint.

  On the other hand, in the zipper joint method, the overlap portion is smaller than in the overlap joint method, and a certain amount of rubber is required between the cords for reliable bonding. Therefore, it is difficult to adopt the zipper joint method for joining the cord ply of the passenger car tire using the cord ply having a thin gauge.

  In addition, since high accuracy is required for the work of joining small overlap portions in order from one end to the other end, the device has a more complicated configuration than the overlap joint method, and the device is subtle. Adjustments are also required. In addition, the number of maintenance and troubles of the device is large, and there is a problem that productivity is greatly reduced as compared with the overlap joint method.

  In addition, the overlap joint method and the zipper joint method cannot be performed by a single device, and in order to make the two methods compatible, it is necessary to provide a device corresponding to each method. There is a problem that a large space is required and the cost is increased.

  And since the butt joint method does not provide an overlap part, as with the zipper joint method, a certain amount of rubber is required between the cords for reliable joining, and a passenger car using a cord ply with a thin gauge It is difficult to apply to the cord ply of the tire.

  Moreover, since high precision is calculated | required in the operation | work which abuts and joins the end surfaces of the side edge part of two cord plies, there exists a problem that productivity is low like a zipper joint system.

  Therefore, according to the present invention, even a cord ply for a passenger car tire with a thin gauge can be reliably joined with a small overlap portion of 1 to 2 mm as in the zipper joint method or the butt joint method, so that the high speed uniformity TFV can be achieved. A cord ply for producing an excellent tire can be provided. Joining cord plies for tires that can maintain the same high productivity as the overlap joint method without the need for high-precision work such as the zipper joint method and the butt joint method and equipment with complicated configurations An object is to provide an apparatus and a joining method.

In order to achieve the above object, a cord ply joining device for tires according to the present invention includes:
A cord ply joining device for a tire that joins two cord plies in which cords arranged in parallel are coated with unvulcanized rubber at each side edge,
A first pressurizing unit provided with a first pressurizing member on the upper side and a first pressure receiving member on the lower side, and a second pressurizing member provided on the upper side and a second pressurizing member on the lower side. 2 pressurizing means are provided so as to face each other,
The first pressure member and the second pressure member, and the first pressure member and the second pressure member are provided with meshing claw portions that can mesh with each other, respectively.
The first pressurizing means is a first cord ply placed with the first pressurizing member lowered and a side edge projecting toward the second pressure receiving member on the upper surface of the first pressure receiving member. Configured to apply a pressing force to
In the second pressurizing means, the second pressurizing member is lowered, and the side edge portion of the second cord ply placed on the upper surface of the second pressure receiving member overlaps the side edge portion of the first cord ply. In a state in which a pressing force is applied to the part, and subsequently the pressing force is applied, the second pressurizing member and the second pressure receiving member are moved to the first pressurizing means side to face each other. The engaging claw portions are engaged with each other, and a shearing force is applied to the overlapping portion of the two cord plies.

Moreover, the cord ply joining device for tires described above is
Each of the engaging claws is knurled on the contact surface with the cord ply.

The cord ply joining method for tires according to the present invention is as follows:
A method for joining a cord ply for tires using the cord ply joining device for tires,
A first cord ply placing step of placing a first cord ply on the upper surface of the first pressure receiving member with a side edge projecting toward the second pressure receiving member;
A second cord ply placement step of placing the second cord ply on the upper surface of the second pressure receiving member and placing an overlapping portion with a side edge portion of the first cord ply on the side edge portion;
A first cord ply pressing step of lowering the first pressing member and applying a pressing force to the first cord ply;
Simultaneously with the first cord ply pressing step, a second cord ply pressing step of lowering the second pressure member and applying a pressing force to the overlapping portion,
In the state where the pressing force is applied by the two cord ply pressing steps, the second pressurizing member and the second pressure receiving member are moved to the first pressurizing means side, and the meshing claws opposing each other And a shearing force application step of applying shear to the overlapping portion by engaging each other.

Further, the cord ply bonding method for the tire is
The side edges of the two cord plies are joined while heating.

  According to the present invention, even a cord ply for a passenger car tire with a thin gauge can be reliably joined with a small overlap portion of 1 to 2 mm, similar to a zipper joint system or a butt joint system, and thus excellent in high-speed uniformity TFV. A cord ply for manufacturing a tire can be provided. On the other hand, cord plies for tires that do not require high-precision work such as the zipper joint method and butt joint method and equipment with complicated configurations, and can maintain the same high productivity as the overlap joint method It is possible to provide a bonding apparatus and a bonding method.

  Hereinafter, the best mode for carrying out the present invention will be described. In addition, this invention is not limited to the following forms. Various modifications can be made to the following embodiments within the same and equivalent scope as the present invention.

  First, the basic contents of the joining method according to the present invention will be described based on FIG. 1 in comparison with a conventional overlap joint system. FIG. 1A is a side view showing a state of pressing against two cord plies 1 and 2 when the conventional overlap joint method is used, and FIG. 1B is a case where the joining method according to the present invention is used. FIG. 1 is a conceptual diagram for facilitating the understanding of the present invention, and the dimensional ratio of each part is appropriately changed from the actual cord ply (the same applies to the drawings in FIG. 2 and subsequent figures).

  As shown in FIG. 1A, in the overlap joint system, the side edge portion of the cord ply 1 and the side edge portion of the cord ply 2 are largely overlapped. Then, when the overlapped portion is pressed in the direction of the white arrow by the pressure member, the unvulcanized rubber in the overlapped portion is integrated and the two cord plies are joined.

  On the other hand, as shown in FIG. 1B, in the joining method according to the present invention, the side edge portion of the cord ply 1 is slightly overlapped with the side edge portion of the cord ply 2 and is further pressed. By pressing from the side in the direction of the thin line arrow by the pressure member and the pressure receiving member, a shearing force is applied to the overlapped portion, and the unvulcanized rubber in the overlapped portion is completely integrated so that the cord ply is firmly joined. Done.

  Thus, unlike the conventional overlap joint method, the joining method according to the present invention not only presses in the vertical direction, but simultaneously applies a shearing force to the overlapped portion from the lateral direction, so a large overlap portion. For example, since the width of the side edge portion required for joining can be set to 1 to 2 mm without fail, the TFV of the high-speed uniformity of the tire can be expected not to deteriorate.

  Next, the first pressurizing means and the second pressurizing means, which are the main parts of the cord ply joining apparatus for tires according to the present invention, will be described with reference to FIG.

  FIG. 2 is a perspective view showing the first pressurizing unit and the second pressurizing unit. As shown in FIG. 2, the first pressurizing means includes a first pressurizing member 7 and a first pressure receiving member 4 that face each other. The second pressurizing means includes a second pressurizing member 6 and a second pressure receiving member 3 that face each other.

  And the 2nd pressurization member 6 is comprised so that it may open and close by rotation centering on the fulcrum outside a figure located in the upper part of the 1st pressurization member 7. FIG. Similarly, the second pressure receiving member 3 is also configured to open and close with respect to the first pressure receiving member 4 by rotation.

  The first pressure member 7 has a meshing claw portion 10b, the second pressure member 6 has a meshing claw portion 10a, the first pressure receiving member 4 has a meshing claw portion 9b, and the second pressure receiving member 3 has a meshing claw portion 10b. Is provided with a meshing claw portion 9a, and the meshing claw portions 10a, 10b and 9a, 9b are opposed to each other.

  The first pressure receiving member 4 is provided with a spring 5 that biases the upper portion thereof upward. By providing the spring 5, a step t is formed between the upper end of the first pressure receiving member 4 and the upper end of the second pressure receiving member 3, and the step t is slightly larger than the thickness of one cord ply. It is a step.

  As each pressure member and pressure member, a metal member having high hardness is preferable. Specifically, a metal having a Vickers hardness (Hv) of 200 or more, for example, an iron member of S45C or more is preferable.

  As the size of each meshing claw, the width of the bottom is preferably 5 to 15 mm, the width of the tip is preferably 40 to 100% of the bottom width, and the height is preferably 100 to 150% of the bottom width. . If the bottom width exceeds 15 mm, uniform meshing becomes difficult, and local meshing failure may occur. If it is less than 5 mm, the number of meshing claws increases, so that it becomes difficult to perform the cutting process for providing the meshing claw parts, and the processing cost increases. An example of a specific shape of the meshing claw portion is shown in a plan view in FIG.

  Next, the joining method using the cord ply joining device for tire according to the present invention will be described in detail with reference to FIGS.

  FIG. 4 is a diagram for explaining a method for joining a cord ply for tires according to the present invention. In the joining process, each pressing means, specifically, the operating state of each pressing member and each pressure receiving member is shown in a plan view. Shown in figure and side view.

  5 to 8 are perspective views showing operation states of the pressure members and the pressure receiving members during the joining process.

(1) Step 1
In Step 1, a process of placing two cord plies on the upper surface of each pressure receiving member will be described. As shown in FIG. 4A, each pressure member is raised and separated from each pressure receiving member facing each other. The lower end portion of each pressure member and the upper end portion of each pressure receiving member are opened by slightly rotating the second pressure member 6 and the second pressure receiving member 3. Further, the first pressure receiving member 4 is provided with a spring 5 that biases the upper portion thereof upward.

  First, the first cord ply 1 is placed on the upper surface of the first pressure receiving member 4 with the side edge of a predetermined width protruding toward the second pressure receiving member 3 side.

  Next, the second cord ply 2 runs on the upper surface of the second pressure receiving member 3 from the right side of the drawing, and the first pressure receiving member is disposed on the upper end of the first pressure receiving member 4 and the upper end of the second pressure receiving member 3. Since the step is provided by the spring 5 provided at 4, the second cord ply 2 that has traveled does not collide with the first cord ply 1 and has a predetermined length under the first cord ply 1. The vehicle travels, stops against the stepped portion of the first pressure receiving member 4, and is placed on the upper surface of the second pressure receiving member 3. Thereby, an overlapping portion with the protruding side edge portion of the first cord ply 1 is formed. By providing such a step, the overlapping portion can be formed with high accuracy. FIG. 5 is a perspective view showing the situation of step 1.

(2) Step 2
In step 2, a process in which the first pressing member 7 and the second pressing member 6 are lowered and a pressing force is applied to the overlapping portion will be described (see FIG. 4B). As shown in FIG. 6, the first pressure member 7 and the second pressure member 6 that have been lowered first, the first cord ply 1 and the first pressure member 7 placed on the upper surface of the first pressure receiving member 4. Touch. At this time, since the first pressure receiving member 4 and the second pressure receiving member 3 are provided with a step, the second pressure member 6 is different from the second cord ply 2 placed on the upper surface of the second pressure receiving member 3. Not yet in contact. In addition, as a specific pressurizing means, for example, pressing by a cylinder or the like is used.

  When further pressed, as shown in FIG. 7, the upper surface of the first pressure receiving member 4, which has been urged by the spring 5 and protruded upward, is pressed and lowered, and then the meshing claw of the second pressure member 6. The lower end of the portion 10 a comes into contact with the second cord ply 2 placed on the upper surface of the second pressure receiving member 3. Thereafter, by further lowering the first pressure member 7 and the second pressure member 6, the first cord ply 1 is securely fixed, and the overlapping portion of the two cord plies is connected to the second pressure member 6. It is pressed by the second pressure receiving member 3 and pressed in the vertical direction.

(3) Step 3
In step 3, a process in which a shearing force is further applied to the overlapping portion of the two cord plies will be described (see FIG. 4C). In step 2, the first cord ply 1 is securely fixed by the first pressure member 7 and the first pressure receiving member 4, and the overlapping portion of the two cord plies is pressed by the second pressure member 6 and the second pressure receiving member 3. In this state, the second pressure member 6 and the second pressure receiving member 3 are rotated to move the respective meshing claw portions to the first pressure means side so that the meshing claw portions facing each other mesh with each other. . FIG. 8 shows a perspective view after meshing.

  At this time, in addition to the vertical pressing force by the second pressure member 6 and the second pressure receiving member 3, a transverse shear force is applied to the overlapping portion of the two cord plies. At this time, as described above, the first cord ply 1 is securely fixed, and the overlapping portion of the two cord plies is the tip of each meshing claw portion of the second pressure member 6 and the second pressure member 3. Since the first cord ply 1 does not move and the overlapping portion of the two cord plies does not shift, the meshing claw portions 9a and 10a hold the unvulcanized rubber with a large shear. You can apply power. As a result, the overlapping portions of the cord plies can be easily integrated and firmly joined.

  In FIG. 4C and FIG. 8, for the sake of easy understanding, the engagement claw portion is shown in a completely engaged state, but actually, as described above, rubber is partly engaged. It is sandwiched.

  It is preferable that knurling is performed on the contact surface of each meshing claw portion with the cord ply. By applying knurling, the first cord ply 1 can be securely fixed without causing the first cord ply 1 to slip when the meshing claws are meshed, and the overlapping portion of the two cord plies is also the second pressure member. 6 and the second pressure receiving member 3 do not slide, and a shearing force can be reliably applied in the lateral direction. In particular, since the first pressure member 7 or the first pressure receiving member 4 and the contact surface of the first cord ply 1 are liable to slip, at least the meshing claw portions of the first pressure member 7 and the first pressure receiving member 4 respectively. It is preferable that the contact surface with the cord ply is knurled, and the number of knurling lines is preferably 5 or more.

  In this way, in addition to applying a vertical pressing force to the overlapping part of the two cord plies, a shearing force is also applied from the lateral direction. Even if it is made as small as 1-2 mm, it becomes possible to join reliably. Further, it is possible to provide a tire having a TFV that is not inferior to the TFV of a high-speed uniformity of a tire made of a cord ply joined by a zipper joint method or the like.

The joining method of the present invention is different from the joining method from the end like the zipper joint method, and is a method of joining the entire overlap portion at a time, so the productivity is as high as the overlap joint method. Can be maintained.
Thus, according to the present invention, it is possible to achieve both high quality and productivity.

  In the above joining method, when joining is performed while heating the side edge portion of the cord ply, the unvulcanized rubber in the overlapped portion is softened, so that it can be more integrated and more firmly joined. . A preferable heating temperature in this case is 60 to 120 ° C. Specifically, for example, the effect of heating is sufficiently exhibited by bonding while heating at about 100 ° C. for 1 to 2 seconds.

  Moreover, the joining apparatus of this invention can be used not only for the joining method of this invention mentioned above but for joining by the conventional overlap joint system.

(Example)
According to the joining method of the present invention described above, each overlap amount (overlapping part of the overlapping portion) shown in Table 1 is used in accordance with the above-described joining method of the present invention using each of the pressure members and the pressure receiving members having the engaging claws having the shape shown in FIG. Two cord plies (size: width 300 mm × thickness 1.0 mm) were joined in the (width), and the pressure applied to the joint was measured.

(Comparative example)
As a comparative example, joining was performed by an overlap joint method using a conventional joining device for an overlap joint method, and the pressure related to the joint portion was measured.

  The measurement results are shown in Table 1 as relative values with the pressure applied to the joint being 100 when the overlap amount is 4 mm and the conventional overlap joint method is used.

  In addition, the pressure applied to the joint when the vertical pressing force is 0.4 MPa, the pressure measurement film (Fuji Prescale manufactured by Fuji Film Co., Ltd.) applied with the microcapsules containing the color former and the developer. Was sandwiched between a pressure member and a pressure receiving member and measured. The measurement results are shown in FIG.

  From the results shown in Table 1, when the overlap amount is 4 mm, in the joining method of the present invention, in addition to the pressing force in the case of the conventional overlap joint method, a shearing force is applied. It can be seen that 1.5 times the pressure is applied to the joint.

  When the overlap amount is 1 mm, in the conventional overlap joint method, the pressure applied to the joint is 81, which is about 20% lower than the case where the overlap amount is 4 mm, and a sufficient joining state is obtained. On the other hand, in the joining method of the present invention, a pressure approximately 1.2 times larger than that in the case of the overlap amount of 4 mm is obtained by the conventional overlap joint method. This shows that when the joining method of the present invention is used, even if the overlap amount is reduced to 1 mm, the joining state is stronger than the case of the overlap amount of 4 mm of the conventional overlap joint method. ing.

  Moreover, as shown in FIG. 9, in the case of the joining method of this invention, it turns out that a large pressing force is applied to the overlap part almost uniformly, and a sufficiently strong joined state can be obtained.

  Thus, according to the present invention, a sufficient bonding force can be obtained even if the overlap amount is reduced. The joining method of the present invention is particularly effective for joining a weft cut ply in which the width of the joining portion needs to be as small as possible because there is a possibility of opening of the cord during joining.

It is a figure explaining the outline | summary of the joining method of this invention, and the joining method of the conventional overlap joint system. It is a perspective view which shows a 1st pressurization means and a 2nd pressurization means. It is a top view which shows an example of the shape of a meshing claw part. It is the top view and side view which show the operation condition of each pressurizing means in the joining process. It is a perspective view which shows the operation | movement condition of each pressurization means in step 1 of a joining process. It is a perspective view which shows the operation | movement condition of each pressurization means in step 2 of a joining process. It is a perspective view which shows the operation | movement condition of each pressurization means in step 2 of a joining process. It is a perspective view which shows the operation | movement condition of each pressurization means in step 3 of a joining process. It is a figure which shows the result of having measured the pressure concerning a junction part using pressure sensitive paper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st code ply 2 2nd code ply 3 2nd pressure receiving member 4 1st pressure receiving member 5 Spring 6 2nd pressurizing member 7 1st pressurizing member 9a, 9b, 10a, 10b Engagement nail | claw part t Level | step difference

Claims (4)

A cord ply joining device for a tire that joins two cord plies in which cords arranged in parallel are coated with unvulcanized rubber at each side edge,
A first pressurizing unit provided with a first pressurizing member on the upper side and a first pressure receiving member on the lower side, and a second pressurizing member provided on the upper side and a second pressurizing member on the lower side. 2 pressurizing means are provided so as to face each other,
The first pressure member and the second pressure member, and the first pressure member and the second pressure member are provided with meshing claw portions that can mesh with each other, respectively.
The first pressurizing means is a first cord ply placed with the first pressurizing member lowered and a side edge projecting toward the second pressure receiving member on the upper surface of the first pressure receiving member. Configured to apply a pressing force to
In the second pressurizing means, the second pressurizing member is lowered, and the side edge portion of the second cord ply placed on the upper surface of the second pressure receiving member overlaps the side edge portion of the first cord ply. In a state in which a pressing force is applied to the part, and subsequently the pressing force is applied, the second pressurizing member and the second pressure receiving member are moved to the first pressurizing means side to face each other. An apparatus for joining cord plies for tire, characterized in that the meshing claws are meshed with each other and a shearing force is applied to an overlapping portion of the two cord plies.   2. The cord ply bonding apparatus for tire according to claim 1, wherein each of the meshing claws is knurled on a contact surface with the cord ply. A method for joining cord plies for tires using the cord ply joining device for tires according to claim 1 or 2,
A first cord ply placing step of placing a first cord ply on the upper surface of the first pressure receiving member with a side edge projecting toward the second pressure receiving member;
A second cord ply placement step of placing the second cord ply on the upper surface of the second pressure receiving member and placing an overlapping portion with a side edge portion of the first cord ply on the side edge portion;
A first cord ply pressing step of lowering the first pressing member and applying a pressing force to the first cord ply;
Simultaneously with the first cord ply pressing step, a second cord ply pressing step of lowering the second pressure member and applying a pressing force to the overlapping portion,
In the state where the pressing force is applied by the two cord ply pressing steps, the second pressurizing member and the second pressure receiving member are moved to the first pressurizing means side, and the meshing claws opposing each other A method for joining a cord ply for a tire, comprising: a shearing force application step of applying shear to the overlapping portion by engaging each other.   4. The method for joining cord plies for tire according to claim 3, wherein the side edge portions of the two cord plies are joined while being heated.

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