JP2016007733A - Band ply forming method and band ply formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to spirally wind a band strip stably and with a good accuracy while achieving uniformalization of a tensile force of a band cord.SOLUTION: A band strip is delivered to a wound body which is rotationally driven while being traversed by use of a delivery roller, whereby the band strip is spirally wound around an outer peripheral surface of the wound body. An annular guide groove formed on the outer periphery surface of the delivery roller has groove side surfaces along both side surfaces of the band strip, and the band strip is vertically guided between the groove side surfaces. The band strip is twisted by 90 degree between the delivery roller and the wound body.

Description

  The present invention relates to a band ply forming method capable of equalizing the tension of a band cord when forming a band ply of a tire by affixing a band strip on a peripheral surface of a wound body while spirally winding the band strip, and a band The present invention relates to a ply forming apparatus.

  In a pneumatic tire with a radial structure, a so-called lifting phenomenon in which the tread portion bulges outward in the radial direction occurs due to the centrifugal force generated when the tire rotates, and this causes high-speed peeling damage starting from the outer edge of the belt layer. There is a problem with durability. Therefore, a band ply in which a band cord is spirally wound is formed outside the belt layer, and the lifting phenomenon is suppressed by its tagging effect.

  Such a band ply is composed of a tape-shaped band strip in which a cord array in which band cords are arranged in parallel is covered with a topping rubber, and one surface of the band strip is spirally formed on the outer peripheral surface of the wound body. A band ply is formed by applying while winding (see, for example, Patent Document 1). At this time, as shown in FIG. 7A, the band strip a is fed to the wound body c by the feeding roller b in a lateral state where the surface thereof is in the axial direction of the wound body c. . As shown in FIG. 7B, the feed roller b is provided with a guide groove e for guiding the band strip a sideways.

  On the other hand, the band strip a having a width of about 10 mm is used to increase the winding efficiency. Therefore, for example, when the outer peripheral surface of the wound body c is curved in a convex arc shape, uneven tension occurs between the band cords in the band strip a, which adversely affects the steering stability of the tire. This non-uniform tension becomes larger as the width of the band strip a is wider.

  Therefore, the present inventor has proposed to use a band strip a having a width of 5.0 mm or less. However, when the narrow band strip a is fed out and guided laterally using the roller b, the band strip a gets over the groove wall surface of the guide groove e as shown in FIGS. There arises a new problem to be solved that the band strip a comes off from the groove e, or twists or bends when hitting the groove wall surface, making it difficult to spirally wind the band strip a stably and accurately. In FIGS. 8A and 8B, the band code is omitted.

JP 2009-51417 A

  Therefore, the invention can suppress the band strip from coming out of the guide groove or twisting or bending in the guide groove while using a band strip having a width of 5.0 mm or less, and making the tension of the band cord uniform. It is an object of the present invention to provide a band ply forming method and a band ply forming apparatus capable of forming a band ply stably and accurately.

In the first invention of the present application, one surface of a band strip having a cord shape in which band cords are arranged in parallel and covered with a topping rubber and having a width Ws of 5.0 mm or less is formed on the outer peripheral surface of the wound body A band ply formation method for forming a tire band ply by pasting while spirally winding,
The band strip is fed to the rotationally driven wound body while laterally moving the band strip using a feed roller that moves laterally in the X-axis direction parallel to the axis i of the wound body. Including a pasting step of pasting while winding spirally around the outer peripheral surface of the wound body,
The delivery roller has a guide groove for guiding the band strip in an annular shape extending in the circumferential direction on the outer peripheral surface of the roller,
And the guide groove has groove side surfaces along the surfaces on both sides of the band strip, and guides the band strip between the groove side surfaces in a vertical direction perpendicular to the X-axis direction.
The band strip is characterized in that one surface of the band strip is attached to the outer peripheral surface of the wound body by twisting 90 degrees between the feeding roller and the wound body.

In the second invention of the present application, one surface of a band strip in which a cord array in which band cords are arranged in parallel is covered with a topping rubber and has a width Ws of 5.0 mm or less is applied to a wound body to be rotated. A band ply forming device for forming a band ply of a tire by being attached to an outer peripheral surface while being spirally wound,
Conveying means comprising a roller axis j parallel to the axis i of the wound body and comprising a feed roller for feeding a band strip to the wound body;
Lateral movement means for laterally moving the feed roller in the X-axis direction parallel to the axis i,
The delivery roller has a guide groove for guiding the band strip in an annular shape extending in the circumferential direction on the outer peripheral surface of the roller,
And the guide groove has groove side surfaces along the surfaces on both sides of the band strip, and guides the band strip between the groove side surfaces in a vertical direction perpendicular to the X-axis direction.
The band strip is characterized in that one surface of the band strip is attached to the outer peripheral surface of the wound body by twisting 90 degrees between the feeding roller and the wound body.

  In the band ply forming method and the band ply forming apparatus according to the present invention, the guide groove has a groove width Wg of 1.2 to 2.0 times the band strip thickness Ts and a groove depth Hg of the band strip. The width Ws is preferably 0.8 times or more.

  As described above, the present invention uses a narrow band strip having a width of 5.0 mm or less. Accordingly, even when the outer peripheral surface of the wound body is curved in a convex arc shape, the tension difference between the band cords in the band strip can be reduced to make the tension uniform.

  Further, the feeding roller for feeding the band strip to the wound body has a guide groove extending in the circumferential direction, and the surface of the band strip is in the X-axis direction (axial direction of the wound body) by this guide groove. Guided in an orthogonal vertical orientation. Therefore, when the band strip moves laterally in the X-axis direction, the band strip can easily bend and deform in the thickness direction following the guide groove. Therefore, it is possible to suppress the band strip from coming off from the guide groove, and the occurrence of twisting or bending in the guide groove. As a result, the band strip can be spirally wound stably and accurately, and a high-quality band ply can be formed.

It is a top view which shows notionally one Example of the band ply formation apparatus which enforces the band ply formation method of this invention. It is a perspective view which shows the principal part of a band ply formation apparatus. It is the side view. It is sectional drawing of a delivery roller. It is a perspective view which shows a band strip. It is sectional drawing which shows an example of the pneumatic tire which has the band ply formed by the band ply formation method. (A) is a plan view conceptually showing a conventional band ply forming method, and (B) is a side view showing a conventional feed roller. (A), (B) is sectional drawing which shows one of the problems by the conventional sending-out roller.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 6 is a cross-sectional view showing a pneumatic tire 1 having a band ply formed by the band ply forming method of the present invention. As shown in FIG. 6, the pneumatic tire 1 includes a carcass 6 that extends from the tread portion 2 through the sidewall portion 3 to the bead core 5 of the bead portion 4, the inside of the tread portion 2, and the radial direction of the carcass 6. A belt layer 7 arranged on the outer side and a band layer 9 arranged on the outer side in the radial direction of the belt layer 7 are provided.

  The carcass 6 is formed of one or more carcass plies 6A in this example, in which carcass cords are arranged at an angle of, for example, 75 to 90 ° with respect to the tire circumferential direction. The carcass ply 6 </ b> A has ply folding portions 6 b that are folded from the inner side to the outer side in the tire axial direction around the bead core 5 at both ends of the toroidal ply main body portion 6 a straddling the bead cores 5 and 5. A bead apex rubber 8 is provided between the ply body portion 6a and the ply turn-up portion 6b. The bead apex rubber 8 extends from the bead core 5 in a radially outward direction.

  The belt layer 7 is formed of one or more belt plies 7A, in this example, two belt plies 7A in which belt cords are arranged at an angle of, for example, 10 to 35 ° with respect to the tire circumferential direction. The belt layer 7 has a belt rigidity increased by crossing the belt cords between the plies, and substantially reinforces substantially the entire width of the tread portion 2 with a tagging effect.

  The band layer 9 is formed of one or more band plies 9A, in this example, one band ply, in which a band cord is spirally wound in the tire circumferential direction.

  In this pneumatic tire 1, except for the band ply 9A, it can be formed by a conventional tire forming method. Therefore, hereinafter, the band ply forming method will be described together with the band ply forming apparatus 10 for performing the method.

  As shown in FIG. 1, the band ply forming apparatus 10 includes a conveying means 13 including a feeding roller 12 that feeds a band strip 30 to the wound body 11, and the feeding roller 12 that is connected to the wound body 11. Lateral movement means 14 for lateral movement in the X-axis direction parallel to the axis i. And band ply 9A is formed by affixing one surface Sa of the band strip 30 to the outer peripheral surface 11S of the body 11 to be wound while being spirally wound.

  In this specification, the direction orthogonal to the X-axis direction and facing the wound body 11 is the Y-axis direction, and the direction orthogonal to the X-axis direction and the Y-axis direction is the Z-axis direction (shown in FIG. 2). Sometimes called. In this example, the X-axis direction and the Y-axis direction are horizontal, and the Z-axis direction is vertical.

  In this example, the wound body 11 includes a tread forming drum 11A and an unvulcanized belt ply 7A attached to the outer peripheral surface thereof. Accordingly, the outer peripheral surface of the belt ply 7A forms the outer peripheral surface 11S of the wound body 11, and the unvulcanized band ply 9A is formed on the outer peripheral surface 11S. The wound body 11 is rotationally driven by the drum driving device 15.

  In this example, the conveying means 13 includes a plurality of guide rollers 17 that rewind the band strip 30 from the reel 16 and guide it to the wound body 11. Among the plurality of guide rollers 17, the guide roller 17 positioned on the foremost end side in the transport direction constitutes the feed roller 12. In this example, a case where the band strip 30 is conveyed in a vertical state from the reel 16 to the feeding roller 12 is shown.

  The “vertical direction” is defined as a direction in which the surface Sa of the band strip 30 is orthogonal to the X-axis direction, in this example, a vertical direction.

  If the band strip 30 is transported in the vertical direction between the feed roller 12 and the guide roller 17a adjacent to the feed roller 12 on the upstream side, the band is located on the upstream side of the guide roller 17a. The strip 30 may be conveyed sideways.

  As shown in FIG. 5, the band strip 30 has a tape shape in which a cord array in which band cords 31 are arranged is covered with a topping rubber 32, and its width Ws is regulated to 5.0 mm or less. Accordingly, even when the outer peripheral surface 11S of the wound body 11 is curved in a convex arc shape, for example, like the tread contour shape, the tension difference between the band cords 31 in the band strip is reduced to reduce the tension. Uniformity can be achieved, and as a result, the steering stability of the tire can be improved. If the width Ws exceeds 5.0 mm, uniform tension cannot be sufficiently achieved. The lower limit of the width Ws is not particularly limited, but is preferably 3.0 mm or more from the viewpoint of winding efficiency. Further, the thickness Ts of the band strip 30 depends on the thickness of the band cord 31 to be used, but when the conventional band cord 31 is used, it is generally 0.7 to 1.2 mm.

  As shown in FIGS. 2 and 3, the lateral movement means 14 includes a lateral movement base 18 that laterally moves in the X-axis direction and a drive tool 19 that drives the lateral movement base 18 in the X-axis direction. The lateral movement table 18 is guided in the X-axis direction by a pair of rails 20 laid on the frame F and extending in the X-axis direction, for example. Further, the driving tool 19 of this example has a ball screw shaft 19 </ b> A parallel to the rail 20. The ball screw shaft 19A is pivotally supported by the frame F and is rotationally driven by a motor (not shown) connected to one end thereof. Further, the ball screw shaft 19A is screwed into a screw hole 18A provided in the lateral movement table 18, so that the lateral movement table 18 can traverse in the X-axis direction according to the rotation of the ball screw shaft 19A.

  Next, the delivery roller 12 is rotatably supported by the lateral movement table 18 via a roller holder 21. The feed roller 12 has a roller axis j parallel to the axis i. Further, a narrow guide groove 22 for guiding the band strip 30 is arranged on the outer peripheral surface of the feed roller 12 in an annular shape extending in the circumferential direction.

  As shown in FIG. 4, the guide groove 22 has groove side surfaces 22 </ b> S and 22 </ b> S along the surfaces Sa and Sa on both sides of the band strip 30. The band strip 30 is guided vertically between the groove side surfaces 22S and 22S. The groove width Wg of the guide groove 22 is preferably 1.2 to 2.0 times the thickness Ts of the band strip 30, and the groove depth Hg of the guide groove 22 is 0.8 times the width Ws of the band strip 30. The above is preferable.

  When the groove width Wg is less than 1.2 times the thickness Ts, the contact resistance with the band strip 30 increases, and the topping rubber 32 may be scraped or peeled off. If the groove width Wg exceeds 2.0 times the thickness Ts, the band strip 30 is displaced in the guide groove 22 and it is difficult to spirally wind the band strip 30 stably and accurately.

  If the groove depth Hg is less than 0.8 times the width Ws, it is difficult to stably guide the band strip 30 in the vertical direction, and the band strip 30 is deformed, and the band strip 30 is stable and accurate. It becomes difficult to spiral. The upper limit of the groove depth Hg is not particularly restricted, but if it is too deep, it is necessary to increase the roller diameter from the viewpoint of roller strength, leading to an increase in cost. Therefore, the upper limit of the groove depth Hg is preferably 1.5 times or less of the width Ws. In general, the groove width Wg is about 1.0 to 1.5 mm, and the groove depth Hg is about 4.0 to 5.0 mm.

  In such a band ply forming device 10, the band strip 30 is moved laterally using the feed roller 12 and sent out to the wound body 11 to be rotationally driven. At this time, the band strip 30 guided vertically by the guide groove 22 is twisted 90 degrees between the feed roller 12 and the wound body 11. Thereby, one surface Sa of the band strip 30 becomes parallel to the outer peripheral surface 11S of the body 11 to be wound, and an attaching step of attaching the band strip 30 while spirally winding it is performed.

  In this example, the lateral movement means 14 supports only the feed roller 12 of the transport means 13 so as to be laterally movable. However, the lateral movement means 14 can also support a part of the guide rollers 17 including the feed roller 12 or the entire conveyance means 13 so as to be laterally movable.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

  The band ply was formed by winding the band strip spirally around the outer peripheral surface of the wound body using the band ply forming apparatus shown in FIGS. And the formation precision of the band ply at that time was evaluated by a five-point method by visual inspection. The formation accuracy is a comprehensive evaluation of scratches on the band strip, variations in the interval between the band strips, and the like. The larger the score, the better the formation accuracy.

  As a comparative example, as shown in FIG. 7B, a feed roller provided with a guide groove for guiding the band strip in a horizontal direction was used. The specifications are the same except for those listed in Table 1. The rotational speed of the wound body is the same at 35 rpm.

  As shown in the table, it can be confirmed that the band ply can be wound in a spiral shape stably and accurately while using a band strip having a width of 5.0 mm or less.

9A Band ply 10 Band ply forming device 11 Wound body 11S Outer peripheral surface 12 Feeding roller 12S Roller outer peripheral surface 13 Conveying means 14 Lateral moving means 22 Guide groove 22S Groove side face 30 Band strip 31 Band cord 31A Code array 32 Topping rubber Sa surface i axis i
j Roller shaft center

Claims (4)

While forming a tape shape in which a cord array in which band cords are arranged in parallel is covered with a topping rubber and spirally winding one surface of a band strip having a width Ws of 5.0 mm or less around the outer peripheral surface of the wound body A band ply formation method for forming a tire band ply by attaching,
The band strip is fed to the rotationally driven wound body while laterally moving the band strip using a feed roller that moves laterally in the X-axis direction parallel to the axis i of the wound body. Including a pasting step of pasting while winding spirally around the outer peripheral surface of the wound body,
The delivery roller has a guide groove for guiding the band strip in an annular shape extending in the circumferential direction on the outer peripheral surface of the roller,
And the guide groove has groove side surfaces along the surfaces on both sides of the band strip, and guides the band strip between the groove side surfaces in a vertical direction perpendicular to the X-axis direction.
A band ply forming method characterized in that one surface of the band strip is attached to the outer peripheral surface of the wound body by twisting 90 degrees between the feeding roller and the wound body. .   The guide groove has a groove width Wg of 1.2 to 2.0 times the thickness Ts of the band strip and a groove depth Hg of 0.8 times or more of the width Ws of the band strip. Item 2. A ply forming method according to Item 1. Formed in a tape shape in which a cord array in which band cords are arranged in parallel is covered with a topping rubber, and one surface of a band strip having a width Ws of 5.0 mm or less is spirally formed on the outer peripheral surface of a body to be rotated. A band ply forming device for forming a tire band ply by sticking while being wound around,
Conveying means comprising a roller axis j parallel to the axis i of the wound body and comprising a feed roller for feeding a band strip to the wound body;
Lateral movement means for laterally moving the feed roller in the X-axis direction parallel to the axis i,
The delivery roller has a guide groove for guiding the band strip in an annular shape extending in the circumferential direction on the outer peripheral surface of the roller,
And the guide groove has groove side surfaces along the surfaces on both sides of the band strip, and guides the band strip between the groove side surfaces in a vertical direction perpendicular to the X-axis direction.
A band ply forming device characterized in that one surface of the band strip is attached to the outer peripheral surface of the wound body by twisting 90 degrees between the feed roller and the wound body. . The guide groove has a groove width Wg of 1.2 to 2.0 times the thickness Ts of the band strip and a groove depth Hg of 0.8 times or more of the width Ws of the band strip. Item 4. The band ply forming apparatus according to Item 3.

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