JP2011194737A - Rubber strip pressing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber strip pressing device that tilts a pressing roller along with the inclination of a winding part, to prevent insufficient adhesion between the winding parts and insufficient ventilation.SOLUTION: The rubber strip pressing device comprises a first tilting element 16 which is supported so as to tilt in the vertical direction around a first axis X in parallel with an axis j of a drum 3, and a second tilting element 17 which is supported so as to tilt around a second axis Y which is orthogonal to the first axis X to the first tilting element 16, and a pressing tool 20. The pressing tool 20 is equipped with a pressing roller 19 which is fixed to the second tilting element 17 and pivotally supported rotatably in the drum circumferential direction at the front end part of an arm 27 which extends forward to the drum 3. In addition, the lower end part 19E of the outer circumferential surface 19S of the pressing roller 19 separates from and comes into contact with the outer circumferential surface 3S of the drum 3, by the vertical tilting of the first tilting element 16. Besides, the second axis Y can be circumscribed to the outer circumferential surface 19S of the pressing roller 19 by the lower end part 19E.

Description

  The present invention relates to a rubber strip pressing device that sequentially presses and winds a winding portion of an unvulcanized rubber strip wound spirally on a rotating drum to the drum side.

  Pneumatic tires are formed using various rubber members with different formulations and cross-sectional shapes, such as tread rubber, sidewall rubber, clinch rubber, breaker cushion rubber, and inner liner rubber, because the required characteristics at each part are different. Yes.

  In recent years, it has been proposed to form such rubber members for tires by means of a so-called strip-winding body formed by spirally winding a tape-like unvulcanized rubber strip (for example, (See Patent Document 1). In this strip winder, for example, as shown in FIG. 8, when the rubber strip b sent to the applicator a is wound around the drum c, the applicator a is moved in the drum axial direction along with the rotation of the drum c. By laterally moving, a wound body having a predetermined cross-sectional shape in which rubber strips b are partially overlapped is formed.

  At this time, the air between the wound portions of the rubber strip b that has been wound is exhausted and the wound portions are firmly bonded to each other, so that the rubber strip b is sequentially pressed by the pressing roller d at the drum c side. Pressed against.

  However, since the conventional pressing roller d is pivotally supported by a support shaft parallel to the drum shaft center, as shown in an enlarged view in FIG. Cannot follow the inclination of Therefore, the pressing roller d is formed of a soft sponge material, and the winding portion is pressed against the drum side by deforming the outer peripheral surface of the roller along the winding portion.

  However, in the case of the sponge material, if the degree of inclination of the winding part is large, the deformation becomes insufficient and the pressing becomes uneven and insufficient, resulting in insufficient adhesion between the winding parts and insufficient exhaust and generation of defective products. Invite. In addition, since the amount of deformation becomes large, the durability of the roller is remarkably lowered, and the production cost and productivity are adversely affected, such as requiring frequent replacement work of the roller.

JP 2007-136740 A

  Accordingly, the present invention is based on the fact that the pressing roller is tiltably supported around the axis passing through the lower end portion of the outer peripheral surface of the pressing roller where the pressing roller can come into contact with the drum. Even when the pressure is large, the pressing roller can be tilted by following the inclination of the winding part, and the pressing to the winding part can be performed uniformly and sufficiently. It is an object of the present invention to provide a rubber strip pressing device capable of suppressing exhaust shortage and increasing the service life of the pressing roller.

In order to solve the above-mentioned problem, the invention of claim 1 of the present application is a pressing method in which a winding portion of an unvulcanized rubber strip wound spirally on a rotating drum is sequentially pressed against the drum side and stuck. A pressing device for a rubber strip having a roller,
A first tilting body supported on the frame so as to be tiltable in a vertical direction around a first axis X parallel to the axis of the drum;
A second tilting body supported by the first tilting body so as to be tiltable about a second axis Y perpendicular to the first axis X;
A pressing tool provided with the pressing roller pivotally supported in the circumferential direction of the drum at a front end of an arm having a rear end fixed to the second tilting body and extending forward toward the drum; ,
In addition, the lower end portion of the outer peripheral surface of the pressing roller can be brought into and out of contact with the outer peripheral surface of the drum by the vertical tilt of the first tilting body,
The second axial center Y is characterized in that it can circumscribe the outer peripheral surface of the pressing roller at the lower end portion.

  According to a second aspect of the present invention, an outer contact point between the second axis Y and the outer peripheral surface of the pressing roller is located at the center in the width direction of the outer peripheral surface.

  According to a third aspect of the invention, the second axis Y passes through the first axis X.

  According to a fourth aspect of the present invention, the first tilting body includes one biasing spring that biases the second tilting body in one rotational direction around the second axis Y, and the other tilting body. A balance means having the other biasing spring for biasing in the rotational direction is attached, and when the pressing roller is not in contact with the rubber strip, the axis of the pressing roller is held substantially parallel to the axis of the drum. It is characterized by being.

  Since the present invention is configured as described above, the pressing tool can be tilted up and down around the first axis X integrally with the first tilting body, thereby being provided at the front end of the pressing tool. The lower end portion of the outer peripheral surface of the pressing roller is in contact with the outer peripheral surface of the drum. That is, the pressing roller is lowered by the downward tilt of the first tilting body, and the lower end portion of the outer peripheral surface of the pressing roller comes into contact with the winding portion of the rubber strip and presses the winding portion against the drum side. sell.

  On the other hand, the pressing roller is supported so as to be able to tilt around a second axis Y perpendicular to the first axis X. The second axis Y is supported at the lower end of the outer periphery of the pressing roller. Circumscribe the surface. That is, the lower end portion of the pressing roller, which is a contact portion with the winding portion, can tilt around the second axis Y passing through the lower end portion.

  For this reason, the lower end portion of the pressing roller, which is the contact portion, is arranged in the drum axial direction even when the winding portion changes in inclination, or even when the distance of the winding portion from the outer peripheral surface of the drum changes. It can be made to follow a winding part, without making it shift to position. Accordingly, the winding portions are not meandered, and the pressing to the winding portions can be performed uniformly and sufficiently, and insufficient adhesion and insufficient exhaust between the winding portions can be suppressed. As a result, the accuracy and quality of the wound body can be improved, the occurrence of defective products due to air accumulation can be suppressed, and the service life of the pressing roller can be increased.

It is a side view which shows an example of the rubber member formation apparatus for tires which incorporated the pressing apparatus of the rubber strip of this invention. It is a perspective view which shows the winding device with a pressing device. It is a perspective view which shows a pressing tool with the 1st, 2nd tilting body. It is sectional drawing which shows a pressing tool with the 1st, 2nd tilting body. It is sectional drawing which shows the inclination around the 2nd shaft center of a pressing roller. It is sectional drawing which shows the effect of this invention. It is sectional drawing explaining the problem in other pressing apparatuses. It is sectional drawing which shows the conventional pressing apparatus. It is sectional drawing explaining the problem in the conventional pressing device.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a side view of a tire rubber member forming apparatus 2 incorporating a rubber strip pressing device 1 according to the present invention. The tire rubber member forming apparatus 2 winds a rubber strip G around a drum 3. The winding device 4 and the pressing device 1 for sequentially pressing and winding the winding portion Ga (shown in FIG. 6) of the rubber strip G to the drum side are configured.

  The rubber strip G is an unvulcanized tape-like body having a long strip shape with a cross section having a thickness of about 0.5 to 4.0 mm and a width of about 12 to 35 mm. After being extruded by a rubber extruding device (not shown), it is conveyed to the winding device 4.

  In the present example, the drum 3 is a well-known tire forming former having a cylindrical shape that can freely expand and contract, and is driven to rotate about a drum axis j. In the expanded diameter state, the rubber strip G is spirally wound on the rotating drum 3 to form a tire rubber member having a desired cross-sectional shape, and the formed tire rubber member is compressed. It is removed from the drum 3 in the diameter state.

  Next, the winding device 4 is attached to the horizontal moving table 5 which can move horizontally in parallel with the drum axis j, and the rubber strip G from the rubber extrusion device is attached to the drum 3. And an applicator 6 for feeding and winding.

  The winding device 4 of the present example is movable forward and backward on the front and rear moving bases 7 supported at right angles to the drum axis j and movably back and forth toward the drum 3. The horizontal moving table 5 is supported on the upper and lower moving tables 8. Reference numeral 7A in FIG. 1 is a front and rear guide for guiding the movable table 7 forward and backward, reference numeral 8A is an upper and lower guide for guiding the movable table 8 up and down, and reference numeral 5A indicates the movable table 5. This is a horizontal guide for guiding in the drum axis j direction.

  The applicator 6 includes a support frame 9 fixed to the horizontal moving table 5, and a conveyor 10 for transporting the rubber strip G to the drum 3 is attached to the support frame 9. In this example, the conveyor 10 includes a lower conveyor 10L having a conveyor belt 12 guided by a guide roller 11 including a delivery roller 11a on the foremost side in the conveyance direction, and a delivery on the foremost side in the conveyance direction. And an upper conveyor 10U having a conveyor belt 14 that is guided by a guide roller 13 including a roller 13a. Then, the rubber strip G is sandwiched between the upper and lower conveying belts 12 and 14 and conveyed to the drum 3. The upper and lower conveyor belts 12 and 14 are non-adhesive with excellent peelability from the rubber strip G, and the rubber strip G is not peeled off from the conveyor belts 12 and 14 when being fed to the drum 3, and is wound together with the conveyor belt. It prevents it from returning. This also has the advantage that even a rubber strip G with low adhesive strength can be easily conveyed to the drum 3. As the non-adhesion treatment, for example, the surface of the conveyor belts 12 and 14 is coated with a resin such as nylon, polyester, Teflon (trademark of DuPont), and / or the surface of the belt is provided with an uneven pattern such as a satin finish. Can be mentioned.

  Next, as shown in FIG. 2, the pressing device 1 includes a frame 15 attached to the support frame 9 of the applicator 6, and a first axis X parallel to the drum axis j on the frame 15. The first tilting body 16 is supported so as to be tiltable in the vertical direction around the first tilting body 16, and the first tilting body 16 is tiltable about the second axis Y perpendicular to the first axis X. A second tilting body 17 (shown in FIGS. 3 and 4) to be supported, and a rear end of the second tilting body 17 are fixed to the front end of the arm 27 extending forward toward the drum 3. And a pressing tool 20 provided with a pressing roller 19.

  In this example, the frame 15 has a pair of side plate-like bases 15A that are fixed to the support frame 9 and rise on both outer sides in the width direction of the transport belt 12. A bearing with a built-in bearing is provided at the upper end of the base 15A. A holder 15B is attached.

  In this example, the first tilting body 16 has a rectangular block shape, and both side surfaces of the first tilting body 16 extend along the first axis X and are supported by the bearings of the bearing holder 15B. A portion 16A is provided protruding. The first tilting body 16 is connected to tilting means 21 for tilting the first tilting body 16 about the first axis X.

  In this example, the tilting means 21 includes a substantially L-shaped mounting plate 22 having a front end portion fixed to the frame 15 on one side and provided with a rising portion 22A that rises rearward and rises upward at the rear end portion, A cylinder 23 having a rear end portion pivotally supported by the rising portion 22A and a rod 23A projecting forward, and a lever 24 having a lower end portion fixed to the tip end of the support shaft portion 16A on one side and extending upward. Have. The upper end portion of the lever 24 is pivotally attached to the front end portion of the rod 23A of the cylinder 23. Therefore, the tilting means 21 can tilt the first tilting body 16 in the vertical direction around the first axis X via the lever 24 by the expansion and contraction of the cylinder 23.

  Next, as shown in FIGS. 3 and 4, the second tilting body 17 is composed of a shaft-like body that extends back and forth along the second axis Y, and is built in the first tilting body 16. The bearing 25 is pivotally supported around the second axis Y so as to be tiltable. The second tilting body 17 penetrates the first tilting body 16 back and forth, and the pressing tool 20 is attached to the front end portion of the second tilting body 17 so as to be integrally tiltable. Further, a balance means 31 described later is linked to the rear end portion of the second tilting body 17.

  The pressing tool 20 includes an arm 27 having a rear end fixed to the second tilting body 17 and extending forward toward the drum 3, and a pressing roller 19 pivotally attached to the front end of the arm 27. Have. The arm 27 has an L-shape having a standing piece portion 27A having a lower end fixed to the second tilting body 17 and extending upward, and an arm body 27B extending forward from the upper end portion of the standing piece portion 27A. Make. In this example, the arm main body 27B extends in parallel with the second axis Y. The pressing roller 19 is pivotally attached to the front end of the arm body 27B via a roller holder 28 so as to be rotatable in the drum circumferential direction. The phrase “rotatable in the drum circumferential direction” means that the axis i of the pressing roller 19 is perpendicular to the drum circumferential direction, in other words, in the drum radial surface S including the drum axis j. It means that heart i is located.

  In the pressing device 1 configured as described above, the pressing tool 20 can be tilted up and down around the first axis X integrally with the first tilting body 16, whereby the outer peripheral surface 19 </ b> S of the pressing roller 19. The lower end portion 19E of the drum 3 can come into contact with the outer peripheral surface 3S of the drum 3. Strictly speaking, the lower end portion 19E means a contact position when the outer peripheral surface 19S of the pressing roller 19 is brought into contact with the outer peripheral surface 3S of the drum 3. Thus, the pressing roller 19 can be lowered by the downward tilting of the first tilting body 16, and the lower end portion 19E of the pressing roller 19 can contact the rubber strip G on the drum 3 and be pressed against the drum side. The pressing force can be adjusted by the pressure of the high-pressure air applied to the cylinder 23.

  Moreover, in the pressing device 1 of the present invention, the second axis Y is circumscribed with the outer peripheral surface 19S of the pressing roller 19 at the position of the lower end portion 19E. Thereby, as shown in FIG. 5 which is a cross-sectional view perpendicular to the second axis Y, the lower end 19E is moved to a point Py (the lower end 19E and the second axis Y on the lower end 19E. Can be tilted around (intersection). In this example, a preferable case is shown in which the point Py is located at the center in the width direction of the outer peripheral surface 19S.

  As a result, as shown in FIG. 6, even when the inclination of the winding portion Ga changes, and even when the distance of the winding portion Ga from the outer peripheral surface 3S of the drum 3 changes, the contact portion The lower end portion 19E can be made to follow the winding portion Ga without being displaced in the drum axis direction. Therefore, the winding part Ga is not meandered, and the pressing to the winding part Ga can be performed uniformly and sufficiently, so that insufficient adhesion and insufficient exhaust between the winding parts Ga can be suppressed. . When the pressing roller 19 tilts at a point P other than the point Py on the lower end portion 19E, for example, as shown in FIG. 7, the lower end portion 19E of the pressing roller 19 is displaced in the tire axial direction by the tilting δ. Is generated. As a result, a displacement in the tire axial direction also occurs in the winding portion Ga of the rubber strip G pressed against the lower end portion 19E, resulting in meandering.

  In this example, as shown in FIG. 4, the second axis Y passes through the first axis X. This is because, when the second axis Y is separated from the first axis X, when the first tilting body 16 tilts, the pressing roller 19 and the lower end portion 19E move back and forth along with the tilting. This is because the position is shifted in the (drum circumferential direction) and the sticking accuracy tends to be impaired.

  The pressing roller 19 can be formed using a sponge material similar to the conventional one. Also in this case, since the amount of deformation of the pressing roller 19 during pressing is greatly reduced, the service life of the pressing roller 19 can be increased. In addition, as the pressing roller 19, there are other ones using a highly elastic sponge material having a smaller foaming ratio than the conventional one, a multi-layer structure in which a rubber layer and a sponge layer made of a sponge material are laminated, only a rubber layer. Various structures such as those constructed can be employed.

  Next, as shown in FIGS. 3 and 4, the first tilting body 16 has one biasing force that biases the second tilting body 17 in one rotational direction around the second axis Y. The balance means 31 having the spring 30a and the other biasing spring 30b that biases in the other rotation direction is attached. Specifically, the balance means 31 includes a mounting plate 32 fixed to, for example, the upper surface of the first tilting body 16, and a lever on the other side that protrudes from both side surfaces of the mounting plate 32. 33 and the second tilting body 17 projecting outward from the rear end of the second tilting body 17, while the other lower lever 34 and one biasing spring 30a spanned between the one upper and lower levers 33, 34. And the other urging spring 30b spanned between the other upper and lower levers 33, 34. The balance means 31 is configured to reduce rotational moments on one side and the other side around the second axis Y by the biasing springs 30a and 30b when the pressing roller 19 is not in contact with the rubber strip G and the drum 3. In balance, the axis i of the pressing roller 19 is held substantially parallel to the drum axis j.

  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.

  In order to confirm the effects of the present invention, a rubber member for a tire (tread rubber) was formed with a strip wind using the pressing device (Example) of the present invention shown in FIG. For comparison, a pressing device of a comparative example in which the pressing tool is fixed to the first tilting body, that is, the pressing roller has a structure in which the pressing roller does not tilt around the second axis Y, is similarly prepared. (Tread rubber) was formed by strip winding. It should be noted that in the example and the comparative example, the same pressing roller made of a sponge material is used, and the only difference is whether or not the pressing roller rotates around the second axis Y.

  As a result of the experiment, it was confirmed that the pressing device of the example was superior to the comparative example with respect to the bonding performance between the winding portions, the exhaust performance, and the service life of the pressing roller.

DESCRIPTION OF SYMBOLS 1 Pressing device 3 Drum 15 Frame 16 1st tilting body 17 2nd tilting body 19 Pressing roller 19E Lower end part 20 Pressing tool 27 Arm 30a, 30b Energizing spring 31 Balancing means G Rubber strip Ga Winding part Py External contact

Claims (4)

A rubber strip pressing device having a pressing roller for sequentially pressing and sticking a winding portion of an unvulcanized rubber strip wound spirally on a rotating drum to the drum side,
A first tilting body supported on the frame so as to be tiltable in a vertical direction around a first axis X parallel to the axis of the drum;
A second tilting body supported by the first tilting body so as to be tiltable about a second axis Y perpendicular to the first axis X;
A pressing tool provided with the pressing roller pivotally supported in the circumferential direction of the drum at a front end of an arm having a rear end fixed to the second tilting body and extending forward toward the drum; ,
In addition, the lower end portion of the outer peripheral surface of the pressing roller can be brought into and out of contact with the outer peripheral surface of the drum by the vertical tilt of the first tilting body,
The rubber strip pressing device, wherein the second shaft center Y can circumscribe the outer peripheral surface of the pressing roller at the lower end portion.   2. The rubber strip pressing device according to claim 1, wherein an outer contact point between the second shaft center Y and the outer peripheral surface of the pressing roller is located at the center of the outer peripheral surface in the width direction.   The rubber strip pressing device according to claim 1 or 2, wherein the second axis Y passes through the first axis X.   The first tilting body includes one biasing spring that biases the second tilting body in one rotation direction around the second axis Y, and the other biasing force in the other rotation direction. The balance means having an urging spring is attached, and when the pressing roller is not in contact with the rubber strip, the axis of the pressing roller is held substantially parallel to the axis of the drum. Item 4. The rubber strip pressing device according to any one of Items 1 to 3.

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