JP6505552B2 - Bead winding former - Google Patents

Description

  The present invention relates to a bead winding former in which a single wire bead wire is wound around a former groove formed in an outer peripheral portion to produce a single wire wire bead core.

  The pneumatic tire is provided with a single wire wire bead core (hereinafter, also simply referred to as a "bead core") in order to secure the rigidity of the tire. The bead core is manufactured using a bead winding former having a former groove formed in the outer peripheral portion. Specifically, a bead core is produced by winding a single wire bead wire (hereinafter, also simply referred to as a "wire") in multiple rows in a former groove and a plurality of steps (for example, Patent Documents 1 to 3).

  The manufactured bead core is gripped by the bead chuck and taken out of the bead winding former and then sent to the next step.

JP, 2011-37059, A JP, 2013-78902, A JP, 2014-83768, A

  However, in the case of producing a bead core having a diameter larger than that of a truck bus tire (TB tire) such as an off-road tire (OR tire) using the above-described bead winding former, there are the following problems.

  That is, since the OR tire requires strength as compared to the TB tire, a bead core having a larger diameter than the bead core for TB is also used for the bead core. For this reason, when manufacturing the bead core for OR, compared with the bead winding former used for manufacturing the bead core for TB, using a bead winding former having a deeper former groove, multiple rows, multiple stages compared to the bead core for TB I am winding a wire.

  Thus, when a bead core for OR with a large diameter is produced using a bead winding former having a deep former groove, it is difficult to smoothly pull out the produced OR bead core from the bead winding former, and the bead core is dropped etc. Process defects may occur to cause a decrease in production efficiency.

  In addition, since the weight of the OR bead core is 5 kg or more, which is heavier than that of a normal TB tire (1 to 3 kg), when extracting the bead core from the bead winding former, it is necessary to increase the strength with which the bead chuck grips the bead core When the bead core is forcibly pulled out with such strength, the roundness of the bead core is affected, which may cause deterioration of uniformity and the like.

  Then, this invention makes it a subject to provide the bead winding former which can be extracted so that the bead core after preparation may not affect roundness in preparation of the bead core for OR.

  The inventors of the present invention conducted intensive studies and found that the above-mentioned problems could be solved by the invention described below, and completed the present invention.

The invention according to claim 1 is
A ring-shaped bead winding former in which a single wire bead wire is wound around a former groove formed in an outer peripheral portion to produce a bead core for an off road tire,
Among the both side walls forming the former groove, the outer peripheral surface of the side wall part on the side from which the manufactured bead core is extracted tapers radially inward from the former groove side to the outer side. It is a bead winding former characterized by being formed into.

The invention according to claim 2 is
The bead winding former according to claim 1, wherein the inclination angle of the outer peripheral surface of the side wall portion formed in the tapered shape is 15 to 20 degrees.

  ADVANTAGE OF THE INVENTION According to this invention, in preparation of the bead core for OR, the bead winding former which can be extracted so that the bead core after preparation may be carried out so that roundness may not be affected can be provided.

It is a perspective view of a bead winding machine with which a bead winding former concerning one embodiment of the present invention was attached. It is an expansion perspective view of the taking-out arm part in FIG. It is the figure which expanded the outer periphery of the bead winding former based on one embodiment of this invention, and showed the cross-sectional structure typically. It is a figure explaining extraction of the bead core for OR in the bead winding former concerning one embodiment of the present invention. It is the figure which expanded the outer periphery of the conventional bead winding former, and showed the cross-sectional structure typically. It is a figure explaining extraction of the bead core in the bead winding former for conventional TB. It is a figure explaining extraction of the bead core in the conventional bead winding former for OR.

1. Background of the Invention As a result of examining the causes of various defects during preparation of the bead core for OR as described above, the inventors have found that the above defects are caused by the structure of the bead winding former. . The details will be described below.

  FIG. 6 is a view for explaining extraction of a bead core in a conventional bead winding former for TB. The bead core 60 for TB expands the diameter of the bead winding former 40 in which the former groove 42 of depth d1 is formed in the outer peripheral part, and as shown in FIG. By winding, it is manufactured to have a predetermined total height h1.

  After the preparation of the TB bead core 60 is completed, the bead winding former 40 is contracted and moved in the downward arrow direction. At this time, since the diameter reduction distance of the bead winding former 40 is set sufficiently larger than the depth d1 of the former groove 42, the outer peripheral surface of the bottom portion of the bead core 60 for TB and the side walls 44 and 46 of the former groove 42. A gap is formed between 44a and 46a, and the bead core 60 for TB can be extracted smoothly in the direction of the horizontal arrow.

  On the other hand, as shown in FIG. 7, the bead core for OR is higher in overall height (h2> h1) compared to the bead core for TB, and the former groove 52 is deep (d2> d1). It is manufactured using. FIG. 7 is a view for explaining extraction of a bead core in a conventional OR bead-wound former.

  At this time, when producing the bead core for OR, the bead winding former is replaced for OR, but the same bead winding machine as that for TB is used. For this reason, the diameter reduction distance of the bead winding former 50 is the same as in the case of the bead core for TB, and even if the diameter of the bead winding former 50 is reduced, the bottom of the bead core 62 for OR and the side wall portions 54 and 56 of the former groove 52 A sufficient gap can not be secured between the outer peripheral surfaces 54a and 56a of the

  As a result, when the OR bead core 62 is extracted in the lateral arrow direction, the bottom of the OR bead core 62 is scraped off while being in contact with the outer peripheral surface 56 a of the side wall 56 of the former groove 52 and scraped off from the bead winding former 50 It has been found that the OR bead core 62 can not be extracted smoothly, and there may be a problem that the bead core 62 comes off from the bead chuck and falls.

  Therefore, when the present inventor extracts the produced OR bead core 62, the bottom of the OR bead core 62 may be prevented from being extracted while rubbing against the outer peripheral surface 56a of the side wall portion 56 of the former groove 52. In particular, a bead winding former having a preferable structure was examined, and the bead winding former of the present invention was completed.

  That is, in the bead winding former according to the present invention, among the side walls forming the former groove, the outer peripheral surface of the side wall from which the manufactured bead core is extracted is directed outward from the former groove side It is characterized in that it is formed in a tapered shape that inclines radially inward.

2. Bead Winding Foamer According to the Embodiment Hereinafter, a bead winding foamer according to an embodiment of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a perspective view of a bead winding machine to which a bead winding former according to the present embodiment is attached. FIG. 2 is an enlarged perspective view of the takeout arm portion in FIG. FIG. 3: is the figure which expanded the outer periphery of the bead winding former which concerns on this Embodiment, and has shown the cross-sectional structure typically.

  As shown in FIG. 1, the bead winding former 1 according to the present embodiment is formed of four fan-shaped former pieces 10a to 10d, and the diameter is enlarged between the former pieces 10a to 10d. A gap d for reducing the diameter of the bead winding former 1 is provided.

  The take-out arms 12 and 14 are disposed on the left and right sides of the bead winding former 1 in FIG. 1, and rubber take-off members 12 a and 14 a are attached to the take-out arms 12 and 14. The above is basically the same as the conventional configuration.

  However, in the present embodiment, the structure of the outer peripheral portion of the bead winding former 1 is different from that of the prior art.

  Specifically, in the conventional bead winding former 50, as shown in FIG. 5, the outer peripheral surfaces 54a, 56a of the side wall portions 54, 56 forming the former groove 52 are formed flat. In the embodiment, as shown in FIG. 3, the outer peripheral surface 26 a of the side wall 26 on the side from which the manufactured bead core is extracted is tapered inward in the radial direction from the former groove 22 side to the outer side. Is formed. The tapered outer peripheral surface is formed over the entire circumference of the annular bead winding former 1.

3. Production and Extraction of Bead Core Next, a procedure for producing a bead core for OR using the bead winding former 1 according to the above-described embodiment and for removing the produced bead core for OR will be described. FIG. 4 is a view for explaining extraction of the OR bead core in the bead winding former according to the present embodiment.

  As shown in FIG. 4, the bead core 32 for OR is produced by winding the wire W around the former groove 22 of the bead winding former 1 also in the present embodiment as in the prior art.

  After the preparation of the OR bead core 32 is completed, the bead winding former 1 is contracted and moved in the downward arrow direction. As a result, the bottom of the OR bead core 32 separates from the bottom of the former groove. Next, while holding down the OR bead core 32 with the pressing members 12a and 14a of the removal arms 12 and 14 shown in FIG. 1, the OR bead core 32 is gripped by the bead chuck (not shown) and the direction of the horizontal arrow in FIG. Move to Thus, the OR bead core 32 can be removed from the bead winding former 1.

  At this time, in the present embodiment, as described above, the outer peripheral surface 26a of the side wall portion 26 on the side from which the bead core 32 is extracted is formed in a tapered shape inclining radially inward outward from the former groove side. Therefore, as described above, the outer peripheral surface 26a of the side wall portion 26 in contact with the bottom of the OR bead core 32 is only one point on the former groove side, and is not in contact with the outside.

  As a result, the rubbing of the OR bead core 32 with the bead winding former 1 is suppressed, and the occurrence of a defect that the OR bead core 32 is detached from the bead chuck and falls can be prevented.

  Also, as in the prior art, the bead core can be smoothly removed without increasing the force by which the bead chuck grips the bead core, so that the roundness of the bead core can be sufficiently maintained. It can also contribute to the improvement of uniformity.

  The inclination angle θ of the tapered outer peripheral surface is preferably 15 to 25 °, and particularly preferably about 20 °. If it is less than 15 °, the possibility that the bead core for OR will be taken out while rubbing against the outer peripheral surface 26a of the side wall portion 26 is high, and if it exceeds 25 °, there is a problem that the bead core is easily detached from the bead chuck. There is a fear.

  Examples will be described below.

1. Example and Comparative Example As an example, using the bead winding former according to the above-described embodiment, a 25-inch bead core for OR is manufactured, and the diameter of the bead winding former 1 is reduced to make the bead core for OR I took out. The inclination angle of the tapered outer peripheral surface was set to 20 °.

  In the comparative example, manufacture and extraction of the bead core for OR were performed under the same conditions as the example except that the conventional bead winding former 50 shown in FIG. 5 was used.

2. Evaluation In Examples and Comparative Examples, the number of occurrences of dropping of the OR bead core was measured when the OR bead core was extracted.

  As a result, in the comparative example, 8 pieces of OR bead cores dropped when making and taking out 10 pieces of bead cores for OR, and it became difficult to continue the production, so production of the bead cores for OR was carried out I canceled it. On the other hand, in the example, the drop of the bead core for OR did not occur at all even though the production and removal for 200 pieces were performed.

  From this, as in the above-described embodiment, the outer peripheral surface of the side wall portion adjacent to the former groove is formed into a tapered shape which inclines inward in the radial direction toward the bead extraction direction. It has been confirmed that the fall can be properly prevented.

  As mentioned above, although the present invention was explained based on an embodiment, the present invention is not limited to the above-mentioned embodiment. Various modifications can be made to the above embodiment within the same and equivalent scope of the present invention.

DESCRIPTION OF SYMBOLS 1, 40, 50 Bead winding former 10a, 10b, 10c, 10d Former piece 12, 14 Taking-out arm 12a, 14a Pressing member 32, 62 Bead core for OR 22, 42, 52 Former groove 24, 26, 44, 46 Side wall part 54, 56 Side wall portion 24a, 26a, 44a, 46a Outer peripheral surface of side wall portion 54a, 56a Outer peripheral surface of side wall portion 60 TB bead core W Wire d Former piece gap d1, d2 Groove depth h1, h2 Total height θ of bead core angle

Claims (2)

A ring-shaped bead winding former in which a single wire bead wire is wound around a former groove formed in an outer peripheral portion to produce a bead core for an off road tire,
Among the both side walls forming the former groove, the outer peripheral surface of the side wall part on the side from which the manufactured bead core is extracted tapers radially inward from the former groove side to the outer side. A bead winding former characterized by being formed into.   The bead winding former according to claim 1, wherein an inclination angle of an outer peripheral surface of the side wall portion formed in a tapered shape is 15 to 25 degrees.

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