JP2011156789A - The folding method and folding apparatus of ply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding method and an apparatus of a ply capable of enhancing productivity under suppressing dispersion of operation quality by automating folding of a ply upon production of a pneumatic tire. <P>SOLUTION: A method for folding a ply comprises setting a ply and a bead core on a cyclic molding drum 20 and folding around the bead core an inner edge side of a ply on the bead core, which extends up to an inner side of a radius direction of the drum. Before setting the ply on the molding drum, a plate 11 is set forth in an inner side than a radius direction of the drum from the bead core on the molding drum, and after setting forth the ply and the bead core on the molding drum, the plate 11 is drawn to the outside of the axis direction of the molding drum together with an inner edge side of the ply and then a dilation means 12, which is set forth in an inner side than a radius direction of the drum from the bead core on a molding drum side, is dilated outside a radius direction of the drum of the bead core, whereby the inner edge side of the ply drawn outside of an axis direction of the molding drum is folded around the bead core. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a ply folding method and a folding device (hereinafter also simply referred to as “folding method” and “folding device”), and more specifically, a ply (band) folding method and a folding device applied to a tire molding process. About.

  Conventionally, as a device used for turning a tire constituent member, a folded portion on the axially outer side of the bead of a cylindrical tire constituent member that is affixed to a molding drum and a bead is set on the outer side in the axial direction, An apparatus is known in which the outer end in the axial direction is sandwiched and moved between the bladder and the protruding portion of the cylindrical body so as to be folded back inward in the axial direction around the bead (see Patent Document 1). ).

  In addition, as a carcass ply bent portion forming device for the purpose of attaching the side edge for winding up the carcass ply to an accurate shape and size, a ply table for placing the carcass ply on a plane, and the ply A chuck head that can be freely attached to the side edge for winding up the carcass ply placed on the table, and a head operating means that moves the chuck head in a state in which the side edge is attached so that the side edge is folded upward and inward. An apparatus including the above is also known (see Patent Document 2).

  Further, in Patent Document 3, a ply and a bead core are provided around an annular forming drum, and the inner end of the ply extending to the radially inner side of the bead core is folded back around the bead core. The step of pulling out the bead core from the inside in the radial direction to the side and releasing the grip on the ply by the gripping means, and expanding and contracting means disposed on the radially inner side of the bead core to the outside in the radial direction, And a method of folding back the inner end of the drawn ply around a front bead core.

Japanese Patent Laid-Open No. 6-286019 (Claims etc.) JP 2005-74820 A (Claims etc.) JP 2009-66842 A (Claims etc.)

  However, when molding truck tires, construction machinery tires, aircraft tires, etc. that generally require strength, plies that cannot be folded using a bladder have been folded manually by conventional methods. In addition, the burden on the worker is large, and there is a concern about the occurrence of variations in quality by the worker. On the other hand, although there is a technique disclosed in Patent Document 3, there has been a demand for further improvement techniques from the viewpoint of further improving workability.

  Accordingly, an object of the present invention is to automate the ply folding operation when molding a pneumatic tire, particularly a truck tire, etc., thereby reducing the quality of the ply and improving the productivity while suppressing the variation in work quality. It is to provide a method and a folding device.

  As a result of intensive studies, the present inventor has found that the above-described problem can be solved by adopting the following configuration, and has completed the present invention.

That is, the ply folding method of the present invention is a ply folding method in which a ply and a bead core are arranged on an annular forming drum, and an inner end of the ply extending to the inside in the drum radial direction of the bead core is folded around the bead core. Because
Prior to placement of the ply on the forming drum, a plate is placed inside the forming drum in a drum radial direction from the bead core, and after the ply and bead core are placed on the forming drum, the plate is After being pulled out together with the inner end of the ply to the outside in the axial direction of the forming drum, the expansion / contraction means disposed on the inner side in the drum radial direction from the bead core on the side of the forming drum is expanded outward in the drum radial direction of the bead core. The inner end of the ply drawn out to the outside in the axial direction of the forming drum is folded around the bead core.

  In the folding method of the present invention, it is preferable to use a bladder as the expansion / contraction means. The plate can be pulled out by using a pulling device attached to the inside of the expansion / contraction means in the drum axial direction.

Further, the ply folding device of the present invention is a ply folding device for folding the inner end of the ply extending to the inside in the drum radial direction of the bead core among the ply and the bead core arranged on the annular forming drum. A device,
A plate in the molding drum, which is detachably arranged on the inner side in the drum radial direction from the bead core and is formed so as to be able to be pulled out to the outer side in the axial direction of the molding drum, and a drum radius on the side of the molding drum from the bead core. And an expansion / contraction means that is detachably disposed on the inner side in the direction and is formed so as to be expandable to the outer side in the drum radial direction of the bead core.

  In the folding device of the present invention, it is preferable that a plurality of holes are formed in the peripheral portion of the plate along the circumferential direction. The expansion / contraction means is preferably a bladder. Furthermore, it is preferable that a drawer device for pulling out the plate is attached to the inside of the expansion / contraction means in the drum axial direction.

  According to the present invention, with the above-described configuration, the work is lightened by automating the ply folding work when molding a pneumatic tire, particularly a truck tire, etc., while suppressing variations in work quality, A ply folding method and a folding device that can improve productivity can be realized.

It is a schematic sectional drawing which shows one structural example of the folding apparatus of the ply of this invention. (A) is a top view which shows one suitable example of the plate used for this invention, (b) is a fragmentary sectional view of the plate which follows the AA line in (a). It is the 1st explanatory view showing the flow of the folding method of the ply of the present invention. It is a 2nd explanatory view which shows the flow of the folding method of the ply of this invention. It is a 3rd explanatory view which shows the flow of the folding method of the ply of this invention. It is the 4th explanatory view showing the flow of the folding method of the ply of the present invention. It is a 5th explanatory view showing a flow of a ply folding method of the present invention. It is a 6th explanatory view showing a flow of a ply folding method of the present invention. It is a 7th explanatory view showing the flow of the ply folding method of the present invention. It is an eighth explanatory view showing the flow of the ply folding method of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The present invention is a technique applied when a ply and a bead core are arranged on an annular molding drum in a tire molding process, and an inner end of a ply extending to the inner side in the drum radial direction of the bead core is folded around the bead core.

  FIG. 1 is a schematic cross-sectional view of a configuration example of a ply folding device according to the present invention. As shown in the drawing, the folding device 10 of the present invention includes a plate 11 in a forming drum 20 that is detachably arranged on the inner side in the drum radial direction from a bead core (not shown), and a bead core on the side of the forming drum 20. A bladder 12 is provided as an example of expansion / contraction means that is detachably disposed on the inner side in the drum radial direction (not shown). In the present invention, by adopting an apparatus configuration including such a plate 11 and expansion / contraction means, the inner end of the ply is placed around the bead core using the plate 11 and expansion / contraction means instead of the conventional manual operation. It can be easily folded back, and productivity can be improved while suppressing variations in work quality.

  The plate 11 is formed so as to be able to be drawn out to the outside in the axial direction of the forming drum 20, and by pulling out to the outside in the axial direction of the forming drum 20, it is necessary to exert an action of folding the inner end of the ply into the bead core. Therefore, as shown in the drawing, it is disposed inside the forming drum 20 in the drum radial direction in the vicinity of the place where the bead core is disposed. As long as such an effect can be obtained, the specific arrangement position and the drawing method of the plate 11 are not particularly limited. However, since the forming drum 20 rotates in each process such as bead core driving, ply insertion, and stitching, the plate 11 does not fall off or loosen when the forming drum 20 rotates, and the plate 11 does not fall within the forming drum 20. While maintaining the position, it is necessary to arrange the molding drum 20 so as not to hinder the rotational operation. Therefore, specifically, for example, as a mechanism for attaching the plate 11, it is conceivable to embed a magnet or the like and fix it to the metal portion of the forming drum 20.

  Since the plate 11 is for pulling out the ply in contact with the surface of the rubber part of the ply, the material, shape, thickness, etc., depending on the rubber quality, number and rigidity of the applied ply, tire structure, etc. It is preferable to select an optimum one for performing the folding. Further, since the plate is disposed in the forming drum 20, it is also important that the plate is as light and compact as possible. As a specific material of the plate, a light material having a low surface friction coefficient such as Teflon (registered trademark) resin, MC nylon (manufactured by Nippon Polypenco Co., Ltd.), polypropylene (PP), or vinyl chloride resin is preferable. Use something that will not scratch the surface.

  In addition, as a specific plate shape, an expansion / contraction mechanism (not shown) is provided at the center of the forming drum 20. For example, as shown in the drawing, it is preferable to use a thin donut-shaped disk shape. . Moreover, since the rubber | gum quality of a ply etc. changes with conditions, it is preferable that the peripheral part of the plate 11 is made into the shape which can pull out a ply by a certain amount of friction. Specifically, for example, it is conceivable to round the surface of the edge portion and control the frictional resistance by knurling. Further, when the ply is folded back, the ply is reduced, so that the ply is wrinkled. Therefore, in order to absorb the wrinkles of the ply, as shown in FIGS. 2 (a) and 2 (b), the peripheral edge of the plate is made thin and easily bent, and a plurality of peripheral edges are arranged at a predetermined pitch along the circumferential direction. It is also preferable to form a plate 11A having a peripheral portion formed in a gear shape. In this case, the portions other than the peripheral portion of the plate 11A need to have a certain thickness in order to ensure the strength when the ply is pulled out. Of course, a flat plate not provided with a hole or the like can also be used. In addition, the thickness of the plate 11 can be about 0.5-5.0 mm, for example.

  The outer diameter of the plate 11 can be determined for each individual tire size, and is not particularly limited. However, from the viewpoint of disposing the inside of the forming drum 20 in the drum radial direction in the vicinity of the place where the bead core is disposed. The inner diameter of the bead core is preferably equal to or less. Further, the outer diameter of the plate 11 may be larger than the inner diameter of the bead core. In this case, the plate 11 is bent and pulled out. However, it is not preferable that the outer diameter of the plate 11 is too small because it may hinder the ply folding work. Note that the outer diameter of the plate 11 and the shape of the peripheral edge of the plate 11 synergistically affect the folding workability.

  The bladder 12 as an example of the expansion / contraction means in the present invention is formed to be expandable to the outside in the drum radial direction of the bead core. The bladder 12 is required to expand to the outside of the bead core in the drum radial direction and to return the inner end of the ply drawn out to the outside of the forming drum 20 by the plate 11 around the bead core. As shown in the figure, it is arranged on the inner side in the radial direction in the vicinity of the bead core arrangement position on the side of the forming drum 20. In addition, since the expansion / contraction means in this invention should just be able to return | fold the ply turned back by the plate 11 to the bead core lower side further to the bead core side, when providing several bead cores per side, The expansion / contraction means does not need to be in contact with the bead core, and may be located in a region including at least the radially inner side of the outermost bead core. Further, considering that the inner end of the ply is folded back to the side of the outermost bead core, it is desirable that the expansion / contraction means can expand to the side of the bead core.

  In the present invention, as the bladder 12, a bladder used for folding the carcass ply onto the bead core can be used as it is. The bladder 12 is made of, for example, an annular rubber tube, and is configured to be expanded / contracted by compressed air or the like via an expansion / contraction mechanism 12A. As shown in the figure, the bladder 12 can be movably and detachably fixed to a cylindrical shaft portion 21 provided on the shaft of the forming drum 20, for example. The expansion / contraction means in the present invention is not limited to the bladder 12.

  The folding device of the present invention only needs to be provided with the plate 11 and expansion / contraction means. The other detailed structure of the forming drum 20, the arrangement configuration of the forming drum 20, the plate 11, expansion / contraction means, and the like, and the drive mechanism of each part About etc., it does not restrict | limit in particular and can be suitably determined according to a conventional method. Further, for example, a support member 22 is fastened and fixed to the central portion in the axial direction on the inner peripheral surface of the forming drum 20 using, for example, a bolt 23, and the support member 22 is fixed to the cylindrical shaft portion 21. It is fixed against. Further, the shaft portion 21 is connected to a rotation drive device (not shown).

  The present invention is particularly suitably applied to tire forming processes for truck tires, construction machine tires, aircraft tires, and the like. Specifically, this is an effective technique for a bias tire having a multi-bead structure, in which an outermost structural ply and a plurality of bead cores are arranged on an annular molding drum, and the carcass ply is folded back to each bead core. After that, the inner end of the outermost structural ply extending to the inside in the drum radial direction of the bead core is preferably applied when the inner end of the outermost structural ply is pulled out from the inner side of the tire to be turned around the bead core.

Next, the ply folding method according to the present invention will be described.
First, the process before the ply folding will be briefly described. In the present invention, prior to the arrangement of the members on the forming drum 20, the plate 11 is arranged inside the left and right sides of the forming drum 20 on the inner side in the drum radial direction from the place where the bead core is arranged (FIG. 3). Next, tire constituent members are sequentially arranged on the forming drum 20. First, an unvulcanized inner liner 31 is attached to the outer surface of the forming drum 20. Next, the ply 32 is affixed to the inner liner 31, and the inner end 32a is extended radially inward from the place where the bead core is disposed. At this time, the inner end 32a of the ply 32 enters the inside of the drum as shown in the figure due to the wrinkles generated as a result of attachment.

  Next, a carcass ply 33 formed by covering the carcass cord with rubber is attached to the ply 32, the bead core 34 is positioned, and a bead filler 35 as a reinforcing material is disposed on the outer periphery of the bead core 34, and then the carcass ply 33 Is folded around the bead core 34 (FIGS. 4 and 5). For folding the carcass ply 33 at this time, as shown in the figure, an expansion / contraction means comprising a bladder 12 can be used. That is, after the carcass ply 33 is pasted in a state where the bladder 12 is disposed on both the left and right sides of the forming drum 20 in advance, the bead core 34 and the bead filler 35 are disposed on the outer periphery thereof by the bead setter 24 (FIG. 4). The carcass ply 33 can be folded back around the bead core 34 (FIG. 5). Similarly, for example, two sets of a carcass ply 33, a bead core 34, and a bead filler 35 are arranged on one side of the forming drum 20. As a result, a total of three bead cores 34 are arranged on one side of the forming drum 20, and the carcass ply 33 is folded back with respect to each bead core 34 (FIG. 6).

  Thereafter, as shown in the drawing, the drawer device 14 attached to the inside of the bead setter 24 inside the drum axis direction of the expansion / contraction mechanism 12A of the bladder 12 is moved to connect the drawer device 14 to the plate 11. In the present invention, as shown in the figure, the drawer device 14 used for pulling out the plate 11 is installed in advance in the left and right bead setters 24 used for driving the bead core, or inside the drum axis of the bladder 12 as expansion / contraction means. In addition, after the ply and the bead core are arranged on the molding drum 20, they may be separately installed on the side surface of the molding drum 20. The connection between the drawer device 14 and the plate 11 may be made by any connection mechanism. For example, it is easy to use a mechanism in which the claw portion comes out and is fixed after being inserted into a hole provided in the plate 11. It can be connected to. Further, since the plate 11 after being pulled out is manually removed, the connection mechanism is light in weight on both the plate 11 side and the drawing device 14 side, and may have a structure that can be easily removed. is necessary. In the present invention, the drawing of the plate 11 in the drawing device 14 can be performed using, for example, a cylinder device that can be expanded and contracted in the axial direction of the forming drum 20.

  By using the drawer device 14 and the like as described above, the plate 11 can be pulled out to the outside in the axial direction of the forming drum 20 together with the inner end 32a of the ply 32 (FIGS. 7 and 8). At this time, the plate 11 rubs against the outer surface of the ply 32 to apply tension to the ply 32 and pulls the ply 32 to the outside in the axial direction of the forming drum 20 while pressing the ply 32 against the inside of the bead core 34 in the radial direction. Thereafter, the pulled-out plate 11 is manually removed from the drawer device 14 before the ply 32 is turned back. The plate 11 may be removed from the drawer device 14 after the ply 32 is folded back.

  Next, the bladder 12 as the expansion / contraction means used when the carcass ply 33 is folded around each bead core 34 is inserted in the drum radial direction inside the bead core 34 and the ply 32 on the side of the forming drum 20 in a reduced diameter state. (FIG. 9). At this time, the bladder 12 is disposed in a region including at least the radially inner side of the outermost bead core 34 as illustrated. Thereafter, the bladder 12 is expanded in the same manner as when the carcass ply 33 is folded back and expanded outward in the drum radial direction, so that the inner end 32a of the ply 32 drawn out in the axially outer side of the forming drum 20 becomes the outermost layer. It can be folded around the bead core 34 (FIG. 10).

  The technology of the present invention can be applied to an existing tire molding machine, and the merit is great also in this respect.

10 Ply folding device 11, 11A Plate 12 Bladder 12A Expansion / contraction mechanism 13 Hole 14 Drawer 20 Molding drum 21 Shaft 22 Support member 23 Bolt 24 Bead setter 31 Inner liner 32 Ply 32a Inner end 33 of ply 34 Bead core 35 Bead Filler

Claims (7)

A method for folding a ply, wherein a ply and a bead core are arranged on an annular forming drum, and an inner end of the ply extending to the inside in the drum radial direction of the bead core is folded around the bead core.
Prior to placement of the ply on the forming drum, a plate is placed inside the forming drum in a drum radial direction from the bead core, and after the ply and bead core are placed on the forming drum, the plate is After being pulled out together with the inner end of the ply to the outside in the axial direction of the forming drum, the expansion / contraction means disposed on the inner side in the drum radial direction from the bead core on the side of the forming drum is expanded outward in the drum radial direction of the bead core. A method of folding a ply characterized in that the inner end of the ply drawn out in the axial direction of the forming drum is folded around the bead core.   The ply folding method according to claim 1, wherein a bladder is used as the expansion / contraction means.   The ply folding method according to claim 1 or 2, wherein the plate is pulled out by using a drawing device attached to the inside of the expansion / contraction means in the drum axial direction. Of the ply and bead core disposed on the annular forming drum, a ply folding device for folding the inner end of the ply extending to the inside in the drum radial direction of the bead core around the bead core,
A plate in the molding drum, which is detachably arranged on the inner side in the drum radial direction from the bead core and is formed so as to be able to be pulled out to the outer side in the axial direction of the molding drum, and a drum radius on the side of the molding drum from the bead core. A ply folding device comprising: expansion / contraction means that is detachably disposed on the inner side in the direction and is formed to be expandable to the outer side in the drum radial direction of the bead core.   The ply folding device according to claim 4, wherein a plurality of holes are formed along a circumferential direction in a peripheral portion of the plate.   The ply folding device according to claim 4 or 5, wherein the expansion / contraction means is a bladder.   The ply folding device according to any one of claims 4 to 6, wherein a drawer device for pulling out the plate is attached to the inside of the expansion / contraction means in the drum axial direction.

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