JP3361296B2 - Cord ply side edge joining device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cord ply side edge joining device capable of uniformizing the thickness of the cord plies when the side edges along the cord are butted against each other.

[0002]

2. Description of the Related Art In a ply material A0 for forming a carcass ply, for example, as shown in FIG. 12 (A), a top anti-B0 in which cords are arranged in parallel in a longitudinal direction is usually unwound from a roll BR of the tire. Cut once with a length that corresponds to the carcass width determined by the type and size of
By sequentially joining the side edge portions E along the cord of the top anti-cutting piece B1, the ply material A0 having a predetermined width is formed.

In the production of green tires, as shown in FIG. 12 (B), the ply material A0 is cut into a length corresponding to the drum circumference, and the ply material cut pieces A1 are formed into a cylindrical shape on the forming drum. While winding, the side edges E along the cords that are the start and end of the winding are joined together.

Conventionally, the cord ply P which is the top anti-cutting piece B1 or the ply material cutting piece A1 as described above.
In the case of joining the side edge portions E, the side edge portions E are generally overlapped vertically.

On the other hand, the applicant of the present invention has filed Japanese Patent Application Laid-Open No.
In No. 38686, as schematically shown in FIG.
A so-called zipper type joining device has been proposed in which two pieces a having a cone surface are used and the side edges E of the ply material cutting piece A1 are butted against each other and joined. Since this has a strong force f for urging the respective edge portions E toward the facing sides, there is an advantage that the side edge portions E can be firmly and accurately joined without overlapping each other.

[0006]

On the other hand, on the other hand, the force f is so strong that the topping rubber on the ply surface is excessively attracted, and as shown in FIG. 13 (B).
A thick portion K where the surface of the joint portion rises is formed.
As a result, for example, when the cord ply is used as a carcass ply, the rigidity of this portion K is unevenly increased, so that a large difference occurs in the circumferential extension (spread between cords) during tire vulcanization molding, and the sidewalls. There is a problem of generating dents on the surface.

Therefore, in the present invention, the thickened portion can be flattened evenly by using a leveling roller to press the joint in a heated state, and the thickness can be made uniform. An object of the present invention is to provide a side edge joining device for a cord ply, which can significantly improve the quality without impairing the joining strength.

[0008]

In order to achieve the above-mentioned object, the invention of claim 1 of the present application provides a cord ply composed of cords aligned in parallel and covered with rubber, and side edge portions along the cords. A side edge joining device for joining cord plies next to each other, wherein a supporting piece movable between the side edges from one end to the other end of the cord ply receives a lower surface of the side end of the cord ply. A receiving body provided with a receiving piece having a receiving surface, a joining means which is held on the rear side in the moving direction of the supporting piece and joins the both side edge portions to form a joining portion, and the joining portion is pressed down. The joining means includes a leveling means having a leveling roller for leveling, and the joining means includes two top bodies having a cone surface around the axis of the rotary shaft, which bring the maximum diameter portion of the cone surface closer to each other. Cone-shaped cone Each of which forms a generatrix, has a joining tool arranged so that the rotation axis intersects at an angle that is parallel to the receiving surface, and the leveling means is configured to bond the leveling roller when leveling. It is characterized by having a heating means for heating the portion.

Further, in the invention of claim 2, the heating means is a hot plate which is arranged below the leveling roller and receives the lower surface of the cord ply.

According to the invention of claim 3, the heating means is the heated leveling roller.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, a side edge portion joining device 1 of a cord ply of the present application (hereinafter referred to as a joining device 1) is a receiving body in which a supporting piece 26 is provided with a receiving piece 27 that receives a lower surface of a side edge portion E of a cord ply P. 5 and two pieces 6, 6
A joining means 7 having a joining tool 41 in which the side edges E and E are joined and forming a joint J, and a leveling roller 2 for pressing and flattening the joint J. And a leveling means 3 included therein.

In this embodiment, the joining device 1 is provided with side edges E of a plurality of cord plies P conveyed on the conveyor 4.
The case where E is joined to each other and thereby the long ply material A0 for forming the carcass ply is formed is illustrated. That is, in the present example, the cord ply P is composed of a top anti-cutting piece B1 obtained by cutting the top anti-B0 with a length corresponding to the carcass width, and thus is aligned in parallel and covered with a topping rubber. Formed as an array of cords C, and each cord ply P
Are placed on the conveyor 4 in such a manner that the side edges E along the cord C are substantially butted and aligned in a line along the transport direction.

Further, in this example, the conveyor 4 includes first and second conveyor portions 4A and 4B which are arranged so that they can be connected, and the receiving body 5 and the joining means 7 are provided on the first conveyor portion 4A. And a leveling means 3 is provided between the first and second conveyor sections 4A and 4B.
The joining device sub-section 1B is provided. Conveyor section 4
As A and 4B, a belt conveyor capable of intermittent feeding can be preferably used.

Next, in the joining device body 1A, the receiving body 5 and the joining means 7 are oriented in a direction parallel to the side edge E (hereinafter referred to as F).
It is supported by the first traveling means 17 that can move in the direction). The first traveling means 17 includes a guide 10 having a rail 9 and a traveling tool 11 that moves on the rail 9.

In the present example, the guide 10 includes a rail 9 supported by a frame 12 extending over the conveyor 4 and extending in the F direction, and the traveling tool 11 from a rear end position Y1 of the rail 9 to a front end position. And a drive unit 13 for moving back and forth up to Y2.

The drive unit 13 includes front and rear chain wheels 15 and 15 such as pulleys pivotally supported on the frame 12, and endless connecting cords 16 such as timing belts wound between the chain wheels 15 and 15. And a motor M1 is connected to one of the chain wheels 15 via an on / off clutch and the other chain wheel 1
5 is a rotation angle measuring device 1 such as a rotary encoder
8 work together. Further, the lower running line of the endless string 16 is
The protruding piece 19A extending from the traveling tool 11 is fixed.
Therefore, the driver 13 can move the traveling tool 11 back and forth as the motor M1 orbits the endless string 16, and the driving device 13 can be stably stopped at the rear end position Y1 and the front end position Y2 by the clutch disengagement operation. The measuring device 18
Thus, the current position of the traveling tool 11 can be accurately detected.

The running tool 11 has a running body 19 provided with an engaging groove 14 for engaging with the rail 9 at its upper end, and an elevating unit supported by the running body 19 via an elevating tool 20 so as to be vertically movable. It includes a stand 21.

As shown in FIGS. 3 and 4, the elevating tool 20 includes an elevating guide 22 provided on the front surface of the traveling body 19.
And a pneumatic / hydraulic cylinder 25 which is mounted near the side edge of the traveling body 19 via a mounting member 23 and has a rod end directed downward. Further, the lift table 21 has an engaging piece 21B which is engaged with the lift guide 22 and guided vertically by being attached to the rear surface of the block-shaped base 21A. A bottom piece 21C, which is connected to the rod end of the cylinder 25, is provided at the lower edge of the base 21A so as to project rearward. Further, on the front surface of the base 21A, a mounting surface 21S is formed which is inclined forward with respect to the vertical surface S1 in the direction orthogonal to the F direction by an angle α of, for example, 11 to 13 degrees.
The receiving body 5 and the joining means 7 are supported.

As shown in FIGS. 4, 5 and 6, the receiving member 5 has a support piece 2 extending vertically between the side edge portions E, E.
A plate-shaped receiving piece 27 is provided at the lower end of 6 to form a T-shape, and the receiving piece 27 is interposed between the cord ply P and the conveying surface, so that the cord ply P is provided on the upper surface of the receiving piece 27. The smooth receiving surface 27S is formed to receive the lower surface of the side edge E of the.

The receiving piece 27 has a rectangular plate shape whose rear end portion extends rearward from the supporting piece 26 and is vertically long in the F direction, and the joining means 7 is arranged on the extending portion Z. Further, the receiving body 5 is formed with a plurality of small-diameter rolling rollers 29 ... Which move the receiving piece 27 smoothly on the conveying surface at a plurality of locations (three locations in this example) on the lower surface of the receiving piece 27 and support the support. Guide rollers 30 for guiding the respective side edge portions E of the cord ply P with the receiving surface 27S are provided on both side surfaces of the piece 26. Further, the front edges of the support piece 26 and the receiving piece 27 are tapered toward the front to facilitate the forward movement of the receiving body 5. Further, the receiving body 5 is, in this example, a ply holding lift 32.
It is attached to the lifting table 21 via.

The ply holding lift 32 has a rectangular plate-shaped base piece 34 supported on the mounting surface 21S via a block-shaped pedestal 33, and the front surface of the base piece 34 is a transfer surface. A rail portion 34A extending toward the front side is formed. A pneumatic / hydraulic type cylinder 35 is fixed to the upper end of the pedestal 33 through a mounting plate, and a downward moving rod end of the moving piece is engaged with the rail portion 34A and is vertically movable. 36 is attached. A mounting portion 36A projects forward from the moving piece 36, and the supporting piece 2 of the receiving body 5 is attached to the mounting portion 36A.
6 is bolted. In the present example, the base piece 34 is provided with a nipping roller 39 facing the receiving surface 27S of the extending portion Z in parallel to the lower end of the arm 37 extending downward from the side surface of the base piece 34. By the upward movement of 5, the side edge E of the cord ply P is sandwiched between the receiving surface 27S and the sandwiching roller 39 at a predetermined pressure, and this side edge E is effectively attached to the top body 6 of the joining means 7 provided at the rear side. Guide you to be guided.

The joining means 7 has side edges E passing through the support piece 26 when the traveling tool 11 moves forward,
E is a means for butting and joining each other, and has a joining tool 41 supported by the mounting surface 21S at the rear side of the nip roller 39.

As shown in FIGS. 4, 7 and 8, the joining tool 41 comprises two pieces 6, 6 having a cone surface 43 around the axis N of rotation, and the pieces 6, 6 are The maximum diameter portions 43A of the cone surfaces 43 are brought close to each other, and an angle at which one busbar 44 forming each cone surface 43 is parallel to the receiving surface 27S, that is, the lowest busbar 44 is the receiving surface 2
The rotating shaft cores N are arranged so as to intersect with each other at an angle parallel to 7S.

In this example, the top body 6 is a gear in which the maximum diameter portion 43A is provided with tooth portions 45 meshing with each other. One of the top bodies 6 is, as shown in FIGS. While being supported by the output shaft of a motor M2 such as an air motor fixed to the mounting surface 21S via an L-shaped metal fitting 46, the other top body 6 has, for example, a U shape on the mounting surface 21S. It is pivotally supported through the metal fitting 47 of the. The metal fitting 4
Reference numeral 7 denotes a groove portion 47A for avoiding contact with the output shaft of the motor M2.
Is formed in a concave block shape, and the other top body 6 is rotatably pivotally attached by a support shaft 49 protruding from one end thereof. Further, as shown in FIG. 9, the top body 6 has the maximum diameter portions 43.
An intermediate surface S2 passing through the middle of the ring circle 50 of A is arranged in the F direction and at the center between the side edges E, E.

Therefore, each top body 6 meshes with each other around the rotation axis N and rotates at the same speed by the drive of the motor M2, and at the time of rotation, it is sandwiched between the cone surface 43 and the receiving surface 27S. The side edges E, E to
Pushes backward while urging toward 2. Since this one sandwiches both the upper and lower surfaces of the side edge portions E, E, the biasing force can reach the end edges and be reliably actuated, and the pressure contact force between the side edge portions E, E is increased to join them. The strength can be greatly improved.

As shown in FIG. 10, a fan-shaped contact shape 51 in which the cone surface 43 of the top body 6 contacts the cord ply P is shown in FIG.
Codes C1 to Cn that are moved toward the intermediate surface S2
The displacement distances L1 to Ln of the cords are smaller as the cords are farther from the side edge portion E, and therefore, the disorder of the cords between the portion in contact with the top body 6 and the non-contact portion can be reduced.

Further, in the present embodiment, the joining tool 41 advances the plane S3 including the respective rotation axis cores N, N at an angle β of 11 to 13 degrees substantially equal to the α with respect to the vertical plane S1. It is inclined. This is because, on the rear side of the contact point R of the maximum diameter portion 43A, the cone surface 43 rotates toward the side away from the intermediate surface S2, and as a result, the joined side edge portions E are separated from each other. Because. Therefore, the angle β is 11 to 13
By setting the degree within the range, the pulling force and the amount are optimized, and higher joining strength can be exhibited.

Next, as shown in FIG. 1, the splicing device sub-unit 1B includes the first and second conveyor units 4A, 4A,
4B and a receiving plate 52 having a receiving surface 52S for receiving the lower surface of the joint portion J of the cord ply P, and the receiving plate 52 supported by the second traveling means 53 movable in the F direction. There is provided a leveling means 3 having a leveling roller 2 for pressing and flattening the joint portion J in between.

In this example, the second traveling means 53
Exemplifies a case where the first traveling means 17 and the first traveling means 17 have substantially the same configuration.

That is, the second traveling means 53 comprises a guide tool 55 having a rail 54 and a traveling tool 56 which moves on the rail 54. The guide tool 55 is supported by the frame 12 and is Rail 54 extending in the F direction
And a driver 57 for moving the traveling tool 56 back and forth between the rear end position and the front end position of the rail.

The driver 57 has a front and rear chain wheel 59 pivotally supported by the frame 12, and an endless connecting string 60 wound between the chain wheels 59, 59. Is connected to the motor M3. Further, a projecting piece 61A extending from the running tool 56 is fixed to one running line of the endless link 60, so that the driver 57 moves the running tool 56 back and forth as the motor M3 orbits the endless link 60. Can move.

The traveling tool 56 has a traveling body 61 having an engaging groove 62 for engaging with the rail 54 at its upper end,
At the lower end of the traveling body 61, the leveling roller 2 is supported via an elevating tool 63 so as to be vertically movable toward the conveying surface. In this example, the lifting / lowering tool 63 is composed of a pneumatic / hydraulic cylinder 63A with the rod end facing downward,
The leveling roller 2 is rotatably supported in the F direction by, for example, a U-shaped support fitting 64 attached to the rod end.

Therefore, the leveling roller 2 includes the cylinder 6
It can be lowered by the extension of 3A and evenly moved in the F direction while pressing the joint J with the receiving plate 52 with a predetermined pressing pressure. Cylinder 63 is always used except for leveling movement.
By reducing A, it is possible to stand by at an upper position separated from the joint J. The length of the leveling roller 2 is preferably slightly longer than the width of the thick portion K at the joint J, and is preferably about 50 to 100 mm, for example.

The leveling means 3 is characterized in that it includes a heating means 65 for heating the joint portion J during leveling movement by the leveling roller 2. In the present example, the receiving plate 52 is a heating plate 66 having a built-in heat source such as an electric heater, and the heating plate 66 is used as the heating means 65. The heat loss may be a heat medium such as steam, heated water, or heated oil.

Here, in the heating means 65, the cord ply P joined by the joining means 7 on the upstream side is intermittently fed by the conveyor 4, and the joining portion J thereof is the hot plate 66.
When stopped at the top, the joint J is heated from the lower surface side.
The heating temperature at this time is about 60 to 70 ° C., the pressure applied by the leveling roller 2 is about 9.8 to 24.5 kPa, and the leveling movement speed of the leveling roller 2 is 10 to 15 c.
About m / s is preferable. Outside this range, the thick portion K cannot be flattened sufficiently flat, and heating or smoothing movement takes too much time.

Further, the heating of the joint J needs to be performed after the joint, and the topping rubber is softened before the joint, resulting in an increase in the thickness of the joint J.
When the receiving plate 52 is configured as the heat plate 66 as in this example, it is possible to prevent the cord ply P and the heat plate 66 from coming into contact with each other when the cord ply P is sent by the conveyor 4. preferable. Therefore, in order to make the hot plate 66 stand by at a position lower than the carrying surface at the time of feeding in the intermittent feed, in the present example, the hot plate 66 is supported movably up and down by an elevator 67 such as a cylinder. ing.

Further, the heating means 65 may be, for example, a heat roller having a heat source built in the leveling roller 2. At this time, the receiving plate 52 is further attached to the hot plate 66.
Can also be configured as.

Next, FIG. 11 shows another example of the joining apparatus 1. In the drawing, the joining device 1 exemplifies a case where the leveling roller 2 is provided in the joining device body 1A without using the second traveling means 53. Specifically, the leveling roller 2 is
It is pivotally supported on the bottom piece 21C of the elevating table 21 so as to be rotatable in the F direction via a U-shaped support fitting 69, for example.

At this time, as the heating means 65, it is necessary to configure the leveling roller 2 as a heat roller,
The leveling roller 2 urges downward with a predetermined pressing pressure via an appropriate spring member (not shown).
Further, in this example, since the lower surface of the joining portion J is received, the lower surface of the conveyor belt below the joining apparatus body 1A is held by a support plate, or the joining apparatus body 1A is held by the conveyor portion 4A.
It is arranged above the receiving plate 52 between A and 4B.

The joining device 1 of the present application can also be adopted to join the starting end and the ending end of the ply material cutting piece A1 wound in a cylindrical shape on the forming drum to each other. In this case, the leveling roller 2 can press and move the joint portion J between the drum surface and the drum surface.
The use of the above can be eliminated, and as the heating means 65, the leveling roller 2 is configured as a heat roller.

[0041]

EXAMPLES Using a ply material obtained by joining cord plies with the joining device shown in FIGS. 1 and 2 as a carcass, a radial tire for heavy load with a tire size of 10.00R20 was prototyped and the sidewall surface of a trial tire was tested. The resulting dent depth and code pitch spacing uniformity at the joint were tested. Further, as a conventional example, using a ply material joined by a joining device without a leveling means,
A similar tire was prototyped and compared with the example.

(1) Depth of dent: A test tire was mounted on a measuring rim (7.50), a measured internal pressure (700 kPa) was filled, and the maximum depth of the dent was measured at 10 points, and the average value was calculated. The standard deviation (σ) was calculated.

(2) Uniformity of code pitch interval: The sample tire was disassembled, and the code pitch interval Pj at the joint portion and the code pitch interval P0 at the non-joint portion were measured at 10 locations, and the ratio Pj / P0 was obtained. The average value and standard deviation (σ) of were calculated.

[0044]

[Table 1]

As shown in the table, it can be confirmed that the uniformity of the dent and code pitch intervals is improved.

[0046]

The side edge joining device for cord plies according to the present invention uses a leveling roller and presses the joined part in a heated state, so that the joined part can be leveled. The thickness can be made uniform, and the joining quality can be greatly improved without impairing the joining strength.

[Brief description of drawings]

FIG. 1 is a front view of a joining apparatus showing an embodiment of the present invention.

FIG. 2 is a side view of the main body of the joining device.

FIG. 3 is a perspective view showing a traveling tool.

FIG. 4 is a side view showing a traveling tool together with a receiver and a joining means.

FIG. 5 is a perspective view showing an elevating and lowering device for holding a ply.

FIG. 6 is a perspective view showing a receiving body.

FIG. 7 is a side view showing a ply holding lift and a joining means.

FIG. 8 is a perspective view showing a mounted state of the top body.

FIG. 9 is a side view showing a meshed state of the top body.

FIG. 10 is a schematic view schematically showing a contact shape of a top body with a cord ply.

FIG. 11 is a side view showing another example of the joining device.

FIG. 12A is a diagram showing formation of a ply material for a carcass ply, and FIG. 12B is a diagram showing formation of a carcass on a forming drum.

13 (A) and 13 (B) are diagrams for explaining a conventional technique and its problems.

[Explanation of symbols]

2 Leveling roller 3 leveling means 5 recipients 6 frames 7 joining means 26 Support pieces 27 pieces 27S Receiving surface 41 Splicer 43 Cone surface 43A maximum diameter part 44 Bus 65 Heating means 66 hot plate C code E side edge J joint N rotating shaft core P cord ply

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-8-238686 (JP, A) JP-A-9-70902 (JP, A) JP-A-7-276530 (JP, A) JP-A-64- 31628 (JP, A) JP 60-107326 (JP, A) JP 6-896 (JP, A) JP 63-98424 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29D 30/00-30/72 B29C 65/00-65/82

Claims (3)

(57) [Claims] 1. A side edge joining device for a cord ply, which joins cord plies made of cords that are aligned in parallel and covered with rubber, adjacent to each other at each side edge along the cord. A support piece that has a receiving surface that receives the lower surface of the side edge portion of the cord ply on a support piece that can move from one end to the other end of the side edge portion; And a leveling means having a leveling roller that holds the side edges and bonds the both side edge parts to form a bonded part, and a leveling means that presses the bonded part to level the surface flatly. Is a two-piece body having a cone surface around the axis of rotation, and brings the maximum diameter portion of the cone surface closer to each other.
Each of the cone-shaped members of one piece has a connector arranged such that each of the generatrix lines intersects the rotation axis at an angle parallel to the receiving surface, and the leveling means includes the leveling means. A side edge joining device for cord ply, comprising a heating means for heating the joining part when leveling with a roller. 2. The cord ply side edge joining device according to claim 1, wherein the heating means is a heating plate which is disposed below the leveling roller and receives the lower surface of the cord ply. 3. The apparatus for joining side edges of a cord ply according to claim 1, wherein the heating means is the heated leveling roller.