JPH0970902A - Carcass ply end joining device - Google Patents

Abstract

(57) [Summary] [Purpose] To join the opposite ends of a carcass ply, which is wound around the forming drum once, with high precision and strength without excessively disturbing the cord pitch. A device for joining both ends E1 and E2 of a carcass ply 4 wound around a cylindrical forming drum 2 one by one, the support piece 2 passing through a small gap G between the ends E1 and E2.
6, the receiving surface 27 that receives the lower surface 4S of the carcass ply 4
It comprises a receiving body 5 provided with a receiving piece 27 having S, and a joining means 7 for bringing the both end portions E1 and E2 passing through the supporting piece 26 into contact with each other and joining them. The joining means 7 comprises two pieces 6 having a cone surface 43 around the rotation axis N,
Are arranged at an angle such that the maximum diameter portion 43A of the cone surface 6 is brought close to each other and each one generatrix 44 is parallel to the receiving surface 27A. An intermediate surface S2 passing through the middle of the ring circle 50 of each maximum diameter portion 43A of the top body 6 is located in the direction in which the small gap G extends and at the center of the small gap G. Further, the plane S3 including the two rotation axis cores N is inclined forward with respect to the plane S1 perpendicular to the molding drum axis J at an angle α of 11 to 13 degrees.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a molding drum 1
The present invention relates to a carcass ply end joining device capable of joining opposite end portions of a carcass ply that is wound around with precision and firmly and without excessively disturbing the cord pitch.

[0002]

2. Description of the Related Art A tire having a radial structure is widely used as a tire excellent in high speed running. However, in a conventional tire having a radial structure, at the time of tire molding, the carcass ply is wound into a cylindrical shape on the forming drum, and both ends e of the winding are vertically overlapped and connected (joint). In the finished tire, as shown in FIG. 14, it extends in a band shape in the radial direction equal to the carcass cord. As a result, when the tire is filled with air,
Although the air pressure per unit area acting on the inner surface of the tire is uniform, the number of carcass cords that handle the overlapping portion j is large at the overlapping portion j, so that the tension per piece is small. So-called joint dents, which are recessed compared to other parts, were generated, impairing the tire appearance. Note that the joint dent is more prominent particularly when a steel cord carcass ply is used and the tire has a smaller number of carcass plies.

Therefore, in recent years, in order to reduce such joint dents, it has been proposed to join the end faces of both ends of the carcass ply to each other, instead of the conventional overlapping, for example, the actual opening 63-. Japanese Patent No. 148417 discloses
As shown in FIG. 15, a pair of drive rollers a inclined in an eight-character shape in a plan view and a pair of shift rollers b inclined in an inverted eight-character shape in a front view, which are located behind the pair, are used, and these are used for a carcass ply. A device for rolling along both ends e is disclosed.

[0004]

However, although this one urges each end portion e of the ply toward the opposite side when the drive roller a rolls, this drive roller a has a cylindrical shape. The urging force does not effectively act even on the ply end edge e1 due to a distance f between the portion c where the roller a contacts the ply and the ply end edge e1, and the ply under the roller floats up from the drum. Therefore, the biasing force itself becomes unstable and small, and the joining force and the joining accuracy are poor.
Further, as shown in FIG. 15, since the plies are abruptly urged to face each other in the contacting portion c, the cord arrangement is likely to be disturbed between the ply and the non-contacting portion. In addition, the mounting balance of the four or more rollers a and b becomes important, and the work efficiency at the time of setting becomes poor.

According to the present invention, the receiving body for receiving the lower surface of the carcass ply and the two conical tops are arranged such that the maximum diameter portions of the cone surfaces are close to each other and one generatrix is parallel to the receiving body. Based on using the arranged joint tool,
It is an object of the present invention to provide an end joining device for a carcass ply, which can join both ends of the carcass ply with high accuracy and high strength and with high efficiency and can solve the above problems.

[0006]

In order to achieve the above-mentioned object, the invention according to claim 1 after the present invention is an end joining device for a carcass ply, wherein an end of winding start on a cylindrical forming drum. An end joining device for a carcass ply that joins the both ends of a carcass ply that is wound around once while maintaining a constant small gap between the end portion and the end of winding, and supporting the same through the small gap. A substantially T-shaped receiving body provided with a plate-like receiving piece having a receiving surface for receiving the both ends on the lower surface of the carcass ply facing the forming drum, and the rear side of the supporting piece of the receiving body And a joining means for abutting and joining the both ends at the rear of the supporting piece passing therethrough, wherein the joining means comprises two top bodies having a cone surface around the axis of rotation, The maximum diameter part of the surface is brought closer and each of the two pieces is An intermediate surface having two connecting members arranged such that the rotation axis cores intersect each other at an angle at which two busbars are parallel to the receiving surface, and further passing through the middle of the ring circle of the maximum diameter portion of the two top bodies. Is located in the direction in which the small gap extends and in the center of the small gap, and a plane including the two rotary shaft cores is formed at an angle α of 11 to 13 degrees with respect to a right-angled surface orthogonal to the shaft center of the molding drum. The feature is that it is tilted forward.

The invention according to claim 2 is characterized in that the width W in the circumferential direction of the molding drum of the receiver is restricted to 32 to 38 mm.

[0008] The two cone-shaped top members that are parallel to the receiving surface of the generatrix hold both ends of the carcass ply between the cone surface and the receiving surface when rotating about the rotation axis, The part is urged and pushed toward the intermediate surface. That is, since this product holds the upper and lower surfaces of both ends over the entire surface thereof, the biasing force can be reliably applied to the edges, and the pressure contact force between the ends can be stably increased to enhance the bonding strength. Also, the joining accuracy can be greatly improved.

For this purpose, the plane including the rotary shaft cores 11 to 11 is perpendicular to the plane perpendicular to the shaft center of the forming drum.
It is necessary to tilt forward by an angle α of 13. This is because, on the rear side of the contact point between the maximum diameter portions, the cone surface rotates toward the side away from the intermediate surface and acts so as to reversely separate the joined end portions from each other. The relative position between the bus and the generatrix, that is, the angle α greatly affects the force and amount of attraction between the end portions. In particular, the angle α is 11
In the range of up to 13 degrees, the pulling force and amount are optimized, the cord pitch at the joint portion is maintained substantially uniform, and bulge / dent on the tire side surface can be suppressed.

When the angle α is less than 11 degrees, the pulling force is insufficient, the joining force is impaired, and the cord pitch facing each other on the joint surface becomes larger than other cord pitches, which induces a bulge on the tire side surface. . Conversely, the angle α
When the angle exceeds 13 degrees, the pulling force sharply increases to 6
This leads to a decrease in pitch interval for cords of more than one book. In addition, when 6 or more cords are crowded, dent is triggered. Further, such a code pitch disorder is also related to the width W of the receiving piece. By setting the width W to be 32 to 38 mm, the bulge
The generation of dents can be suppressed.

[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 carcass ply end joining device 1 (hereinafter referred to as joining device 1) is a lower surface 4S of a carcass ply 4 wound around a forming drum 2 once.
It comprises a receiving body 5 for receiving and a joining means 7 in which two conical bodies 6, 6 are combined. In this example, the receiving body 5 and the joining means 7 move in the axial direction of the molding drum 2. It is held by the traveling means 3.

The carcass ply 4 is composed of a long strip of a cord array in which carcass cords C are aligned in parallel with each other at equal pitches in the width direction and covered with a topping rubber. It is wound around the cylindrical forming drum 2 with one small gap G between the end E1 of the beginning of winding and the end E2 of the end of winding. In the radial tire, since the carcass cords C are arranged in the axial direction of the molding drum 2, the small gap G is also formed along the axial direction. In addition, the molding drum 2 has a butyl-based inner liner rubber layer A having a low air permeability that keeps the tire lumen airtight.
Are preformed, and thus the carcass ply 4 in this example.
Is wound on the molding drum 2 via the inner liner rubber layer A.

Further, the traveling means 3 of the joining device 1 comprises a guide tool 10 having a rail 9 and a travel tool 11 which moves on the rail 9. The guide tool 10 and the travel tool 11 are, for example, the molding drum. It is supported by the frame 12 that extends over the two.

In this example, the frame 12 has a rectangular frame structure in which frame members 12A are connected to each other as shown in FIG. 3, and the guide tool 10 extends along the axial direction of the molding drum 2. A rail 9 laid on one frame member 12A,
A driving device 13 is provided for moving the traveling tool 11 back and forth between a rear end position Y1 of the rail 9 and a front end position Y2.

The driver 13 is a chain wheel 15A such as a pulley pivotally supported inward at both ends of the frame member 12A,
15B and an endless continuous cord 16A such as a timing belt wound between the chain wheels. One chain wheel 15A is connected with a motor M1 such as a reduction motor through an on / off clutch 17 and the other chain wheel 15A. A rotation angle measuring device 18 such as a rotary encoder is linked to the chain wheel 15B. Further, a protruding piece 19A extending from the traveling tool 11 is fixed to the lower traveling line of the endless continuous cord 16A. Therefore, the driver 13
Is capable of moving the traveling tool 11 back and forth as the endless string 16A is circulated by the motor M1, and is stably stopped at the rear end position Y1 and the front end position Y2 by the disengagement operation of the clutch 17, and by the measuring device 18. Running gear 1
The current position of 1 is detected accurately.

The running tool 11 is a bent plate-like running body 19 having an engaging groove 14 for engaging with the rail 9 at an upper end thereof.
And a platform 2 that is supported on the traveling body 19 via a lifting tool 20 so as to be movable up and down toward the axis J of the molding drum 2.
1 and.

In this embodiment, the traveling body 19 has a base piece 19B which is bent downward from the rear edge of the upper end portion provided with the engaging groove 14, as shown in FIG. By extending at a distance from the vertical plane K0 passing through the core J, the elevating table 21 has a distance of 20 to 20 with respect to the vertical plane K0.
It moves along an inclined surface K1 that inclines at an angle θ of 40 degrees. By providing the inclination angle θ in this manner, a winding operation for winding the carcass ply 4 on the forming drum 2,
Molding drum 2 for joining work and confirmation work of end joining
It can be easily done from the side.

As shown in FIGS. 4 and 5, the elevating tool 20 includes an elevating guide 22 provided on the front surface of the base piece 19B.
And a cylinder 25 of pneumatic / hydraulic type or the like, which is mounted near a side edge of the base piece 19B via a mounting bracket 23 and has a rod portion directed downward. Engaging piece 21 engaged with the elevating guide 22 and guided along the inclined surface K1 on the rear surface of the base 21A.
Install B. The cylinder 2 is attached to the lower edge of the base 21A.
A bottom piece 21C to which the rod ends of 5 are connected is provided to project rearward. On the front surface of the base 21A, there is formed a mounting surface 21S which is inclined forward at an angle of 11 to 13 degrees with respect to a right-angled surface S1 which is orthogonal to the axis J. The mounting surface 21S is joined to the receiving body 5. Means 7 are supported.

As shown in FIGS. 5, 6 and 7, the receiving body 5 has a T-shape in which a plate-like receiving piece 27 is provided at the lower end of a supporting piece 26 extending vertically through the small gap G. None, the receiving piece 2
By interposing 7 between the inner liner rubber layer A and the carcass ply 4, a smooth receiving surface 27S is formed on the upper surface of the receiving piece 27 for receiving both end portions E1 and E2 of the carcass ply 4 on its lower surface 4S. . The receiving piece 27 has a rectangular plate shape whose rear end portion extends rearward from the support piece 26 and is vertically long in the axial direction, and the joining means 7 is arranged on the extending portion Z. The receiving body 5 is provided on the lower surface of the receiving piece 27,
For example, three small-diameter rolling rollers 29 that smoothly roll the receiving piece 27 on the inner liner rubber layer A in the axial direction are formed, and the receiving surface 27S is formed on both side surfaces of the supporting piece 26. Between each end E of the carcass ply 4 between
A guide roller 30 is provided to guide the rollers 1 and E2. 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, in this example, the receiving body 5 is attached to the elevating table 21 via the ply holding elevating tool 32.

The ply clamping lift 32 has a rectangular plate-shaped base piece 34 supported on the mounting surface 21S via a block-shaped pedestal 33, and a shaft core J is provided on the front surface of the base piece 34. A rail portion 34A extending toward is formed. Further, a pneumatic / hydraulic cylinder 35 is fixed to the upper end of the pedestal 33 via a mounting plate, and a sliding end of the cylinder 35 is engaged with the rail portion 34A and slidably guided. The piece 36 is attached. A mounting portion 36A projects forward from the sliding piece 36, and the supporting piece 26 of the receiving body 5 is attached to the mounting portion 36A.
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 end portions E1 and E2 of the carcass ply 4 are sandwiched between the receiving surface 27S and the sandwiching roller 39, and the end portions E1 and E2 are provided at the rear of the frame body 6 of the joining means 7.
To guide you to

The joining means 7 has both ends E1 that pass through the support piece 26 when the traveling tool 11 moves forward.
E2 is a means for abutting and joining each other, and has a joining tool 41 supported on the mounting surface 21S at the rear side of the nip roller 39.

As shown in FIGS. 5, 8 and 9, the joining tool 41 comprises two pieces 6 and 6 each having a conical cone surface 43 formed around the axis of rotation N. , 6 are
The maximum diameter portions 43A of the cone surfaces 43 are brought close to each other, and one generatrix 44 of each cone surface 43 is formed on the receiving surface 27.
The rotation shaft cores N are arranged so as to intersect with each other at an angle facing parallel to S, that is, an angle at which the lowermost generatrix 44 is parallel to the receiving surface 27S.

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, and 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 supported via the metal fittings 47. The metal fitting 4
Reference numeral 7 denotes a groove portion 47A for avoiding contact with the output shaft of the motor M2.
Has a recessed shape and is rotatably supported by a support shaft 49 protruding from one end thereof. The frame body 6 is shown in FIG.
As shown in 0, the intermediate surface S2 passing through the middle of the ring circle 50 of each maximum diameter portion 43A is arranged in the direction in which the small gap G extends and in the center of the small gap G.

Therefore, each top body 6 is rotated at the same speed by meshing with each other around the rotation axis N 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 27. The end portions E1 and E2 are
Energize and push towards 2. This is the end E
Since the upper and lower surfaces of 1 and E2 are clamped over the entire surface, the urging force can be reliably applied to the end edge.
It is possible to greatly improve the bonding strength by increasing the pressure contact force between 1 and E2.

Further, as shown in FIG. 11, a fan-shaped contact shape 51 in which the cone surface 43 of the top body 6 contacts the carcass ply 4, as shown in FIG.
The displacement distances L1 to Ln of 1 to Cn are as small as the cords are farther from the end portions E1 and E2, and therefore, the disturbance of the cords between the portion in contact with the top body 6 and the non-contact portion can be reduced.

Further, in the joint tool 41, the plane S3 including the respective rotation axis cores N, N is tilted forward at an angle α of 11 to 13 degrees with respect to the perpendicular surface S1. This is the maximum diameter portion 43A
On the rear side of the contact point P, the cone surface 43 rotates away from the intermediate surface S2, and as a result, the joined ends E1, E
This is because they act to pull apart the two in reverse, and therefore the relative position of this contact point P and the bus bar 44, that is, the angle α.
Greatly influences the force and the amount of attraction between the ends E1 and E2.

In particular, when the angle α is in the range of 11 to 13 degrees, the pulling force and amount are optimized, the cord pitch at the joint is maintained substantially uniform, and the bulge /
The generation of dents can be suppressed. If the angle α is less than 11 degrees, the pulling force is insufficient, the joining force is impaired, and the cord pitch H1 facing each other at the joining surface 52 becomes excessively larger than the other cord pitch H0 as shown in FIG. This portion induces a so-called joint bulge in which this portion is convex on the side surface of the tire. Conversely, when the angle α exceeds 13 degrees, the pulling force sharply increases, and as shown in FIG. 13, six or more cords that make the cord pitch H2 smaller than the other cord pitches H0 are likely to occur. This causes a so-called joint dent in which this portion is recessed on the side surface of the tire. Further, such a disorder of the arrangement of the carcass cords C is also related to the circumferential width W of the forming drum of the receiving piece 27. By setting the width W to be 32 to 38 mm,
It is possible to suppress the occurrence of the bulge dent. As in the present example, the mounting surface 21S is formed so as to be inclined forward according to the angle α, so that the angle α of the top body 6 can be set easily and accurately.

The width W of the receiving piece 27 is 35 mm (constant), the cord arrangement of the carcass ply joined by using the joining tool of the present invention in which the angle α is set to 12 degrees, and the angle α is set to 15 degrees. The code arrangement when set was compared with the state of occurrence of bulge dents on the side surface of the finished tire. The concavo-convex state was visually evaluated in four grades (1st to 4th grade), and the smaller the grade, the better.

As a result of the measurement, when α = 12 degrees: 1st class = 46%, 2nd class = 42%, 3rd class = 12%, 4th class = 0%; ・ When α = 15 degrees: 1st class = 4%, 2nd grade = 34%, 3rd grade = 62%, 4th grade = 0%; and when the angle α is 12 degrees,
It was confirmed that the cord pitch at the joint was maintained substantially uniform.

In the present embodiment, the joining means 7 has an arm piece 5 extending downward from the side surface of the bottom piece 21C of the lift table 21.
3, a compression spring 5 in the drum circumferential direction that is bridged between the lower ends of
4 is attached, and the end portion E1,
The carcass ply 4 to which E2 is bonded is evenly adhered to the inner liner rubber layer A by its tension.

However, the carcass ply 4 which has been preliminarily cut into pieces
Is wound on the forming drum 4. After the running tool 11 returns to the rear end position Y1 corresponding to the ply width, the cylinder 25 of the lifting tool 20 extends to lower the receiving piece 27 to a position close to the forming drum 4. At this time, the operator receives the end surfaces E1 and E2 of the carcass ply 4 on the receiving surface 27S and the guide roller 3
It is passed between 0 and and is guided below the pinching roller 39 behind it. Further, the cylinder 35 is operated to sandwich both end portions E1 and E2 between the receiving surface 27S and the sandwiching roller 39. Further, when the traveling tool 11 is moved forward by the traveling means 3, the both end portions E1 and E2 are engaged and joined by the top body 2 driven by the motor M2. Further, the compression spring 54 at the rear of the joining tool 41 presses the periphery of the joining portion downward, so that the inner liner rubber layer A is evenly adhered. When the traveling body 11 moves to the front end position Y2 where the joining ends, the cylinder 25 moves.
Returns to return to the rear end position Y1.

[0032]

Since the carcass ply end joining device of the present invention is constructed as described above, the opposing ends of the carcass ply wound in a cylindrical shape can be accurately and firmly and automatically. Can be butt-joined.

[Brief description of drawings]

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

FIG. 2 is a partial side view thereof.

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

FIG. 4 is a perspective view showing a traveling tool.

FIG. 5 is a front view showing a traveling tool together with a receiver and a joining means.

FIG. 6 is a perspective view showing a lifting and lowering device for holding plies.

FIG. 7 is a perspective view showing a receiving body.

FIG. 8 is a side view showing a ply holding lift and a joining means.

FIG. 9 is a perspective view showing a mounted state of the top body.

FIG. 10 is a side view showing a meshed state of the top body.

FIG. 11 is a schematic view schematically showing a contact shape of a top body with a carcass ply.

FIG. 12 is a cross-sectional view showing a joined state of carcass plies.

FIG. 13 is a cross-sectional view showing a joined state of carcass plies.

FIG. 14 is a perspective view of a tire illustrating a joint dent.

FIG. 15 is a schematic diagram illustrating a conventional technique.

[Explanation of symbols]

 2 forming drum 4 carcass ply 5 receiving body 6 frame body 7 joining means 9 rail 26 supporting piece 27 receiving piece 27S receiving surface 41 joining tool 43 cone surface 43A maximum diameter part 44 busbar 50 wheel part circle E1, E2 end of carcass ply G Small gap N Rotation axis core S1 Right angle surface S2 Intermediate surface S3 Plane including two rotation axis cores N

Claims (2)

[Claims] 1. A carcass which joins both ends of a carcass ply wound around a cylindrical forming drum with a small gap maintained between an end of winding and an end of winding. A ply end joining device, wherein a support piece passing through the small gap is provided with a plate-shaped receiving piece having a receiving surface for receiving the both ends on the lower surface of the carcass ply facing the forming drum. And a joining means that is held on the rear side of the supporting piece of the receiving body and that joins the both ends by abutting and joining the supporting piece behind the supporting piece. Two pieces having a cone surface around the shaft center bring the maximum diameter portion of the cone surface close to each other, and
A connecting member arranged such that each of the generatrixes of the one frame body intersects the rotation axis at an angle parallel to the receiving surface,
Moreover, an intermediate surface passing through the middle of the ring circle of the maximum diameter portion of the two tops is located in the direction in which the small gap extends and in the center of the small gap, and a plane including the two rotary shaft cores is An end joining device for a carcass ply, characterized in that it is forwardly inclined at an angle α of 11 to 13 degrees with respect to a right-angled surface orthogonal to the axis of the forming drum. 2. A carcass ply end joining device, wherein a circumferential width W of the forming drum of the receiving body is set to 32 to 38 mm.