JP5760372B2 - Pneumatic tire molding equipment - Google Patents

Description

  The present invention relates to a pneumatic tire molding device, and more particularly, a pneumatic tire that has a simple structure and can be temporarily pressure-bonded without causing wrinkles on a tire component that is laminated and wound around a tire molding drum. The present invention relates to a tire molding apparatus.

  In the pneumatic tire molding process, in order to improve the dimensional stability of the green tire, the belt-shaped tire constituent members laminated and wound around the tire molding drum are temporarily pressure-bonded. This crimping operation is performed by rotating the tire molding drum while pressing the surface of the tire constituent member with the crimping roller, and rolling the crimping roller in the drum circumferential direction.

  However, if the surface of a tire component made of unvulcanized rubber is rolled while applying pressure to the pressure roller, the tire components cannot be uniformly and stably temporarily bonded to each other, and the dimensional stability of the green tire is stabilized. There has been a problem of reducing the performance.

  The cause is that the tire outer peripheral surface of the tire molding drum is subjected to non-adhesion treatment so that the unvulcanized rubber does not adhere, so that the tire component wound around the drum is easily displaced, and it is crimped to it. It is considered that when rolling resistance is applied by a roller, the tire constituent member is handled in the circumferential direction of the drum and deformed to cause wrinkles.

  Here, although the object is different from the present invention, for example, a structure in which a plurality of V-shaped protrusions are provided on the outer peripheral surface of the pressure roller has been proposed (see Patent Document 1). Even if such a pressure roller is used, the above-mentioned problem cannot be solved because the V-shaped inclined portion continuously presses the tire constituent member.

Japanese Unexamined Patent Publication No. 3-97533

  An object of the present invention is to provide a pneumatic tire molding apparatus capable of temporarily pressing a tire constituent member laminated and wound around a tire molding drum without generating wrinkles while having a simple structure. is there.

The pneumatic tire molding apparatus of the present invention that achieves the above-mentioned object rolls in the drum circumferential direction while pressing the tire molding drum and the surface of the tire component member that is wound around the outer circumferential surface of the tire molding drum. In a pneumatic tire molding apparatus provided with a moving pressure roller, five protrusions made of round bars extending in the roller axial direction are rotatably provided on the outer peripheral surface of the pressure roller in the circumferential direction of the roller, etc. When projecting at intervals, the outer circumferential surface of the pressure roller does not contact the surface of the tire component when the pressure roller rolls in the drum circumferential direction.

  According to the pneumatic tire molding apparatus of the present invention, the roller is provided on the outer circumferential surface of the pressure roller that rolls in the drum circumferential direction while pressing the surface of the tire constituent member that is laminated and wound around the outer circumferential surface of the tire molding drum. Since the plurality of projecting bodies extending in the axial direction project in the circumferential direction of the roller, the tire constituent member is intermittently pressed along the circumferential direction of the drum by the projecting body projecting on the outer circumferential surface of the pressure roller. Therefore, it is not handled in the circumferential direction of the drum, so that the temporary pressure bonding can be performed without generating wrinkles. In addition, since the plurality of protrusions are merely provided on the outer peripheral surface of the pressure roller in the conventional molding apparatus, the apparatus has a simple structure and is not complicated.

The outer surface of the projection body, since an arc-shaped protruding on the outer circumferential side, the pressing force of the tire component member during contact with the projection member can be prevented from being localized, the tire component member drum It becomes difficult to handle in the circumferential direction, and the effect of preventing the generation of wrinkles can be improved.

When the pressure roller rolls on the drum circumferential direction, that the outer peripheral surface of the pressure roller is configured not to contact with the surface of the tire component member, it is possible to achieve secure the effect of the.

  It is desirable that the protrusion is detachable from the outer peripheral surface of the pressure roller. By doing so, it is possible to select an appropriate projecting body according to the specifications of the tire constituent member, and to reliably and efficiently perform a molding operation related to temporary crimping.

In the present invention, since the protrusion is rotatable, it is possible to further improve the effects of preventing the generation of wrinkles and improving the uniformity of the tire.

1 is a partially enlarged side view of a pneumatic tire molding apparatus according to an embodiment of the present invention. FIG. 2 is a structural diagram of a pressure roller, where (a) shows a cross-sectional view in the radial direction, and (b) shows a cross-sectional view taken along line XX in (a). It is a side view which shows the first procedure in the formation process of a pneumatic tire. FIG. 4 is a side view showing the next procedure following FIG. 3. It is a side view which shows the next procedure following FIG. FIG. 6 is a side view showing the next procedure following FIG. 5.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example in which a pneumatic tire molding apparatus according to an embodiment of the present invention is partially enlarged.

  This pneumatic tire molding device (hereinafter, referred to as “molding device”) is rotatably attached to a tire molding drum 1 that is driven to rotate and a tip portion of an arm 2 that extends in the drum radial direction of the tire molding drum 1. The pressure roller 3 is provided. An actuator 4 is attached to the tip of the arm 2, and the pressure roller 3 can be brought close to or away from the outer peripheral surface 1 a of the tire molding drum 1 by extending and contracting the actuator 4. Yes.

As illustrated in FIG. 2, the pressure roller 3 is formed of a metal cylinder having a center hole 5 into which a rotation shaft is inserted. In the present invention, a plurality of protrusions 6 extending in the roller axial direction (direction along the rotation axis) are provided on the outer peripheral surface of the pressure roller 3 in the circumferential direction. Specifically, as shown in FIG. 2, linear protrusion 6 of five consisting of metal round bar, are respectively attached to the outer peripheral surface of the pressure roller 3. Moreover, the some protrusion 6 is arrange | positioned so that it may become equal intervals in the circumferential direction of the press roller 3, as shown in the example of FIG.

  A molding operation using such a molding apparatus is performed according to the following procedure.

  First, as shown in FIG. 3, the actuator 4 is contracted, and the pressure roller 3 is separated from the outer peripheral surface 1 a of the tire molding drum 1 to be in a standby state. Then, tire constituent members 7A and 7B are sequentially laminated and wound around the outer peripheral surface 1a of the tire molding drum 1. For example, the rim cushion rubber 7B is laminated on the inner liner 7A. Since these tire components are made of only unvulcanized rubber and are easily deformed, the present invention is particularly effective.

  Next, as shown in FIG. 4, the actuator 4 is extended, and the surface of the tire constituent member 7 </ b> B on the outer peripheral side is pressed by the pressure roller 3 through the protrusion 6.

  Next, as shown in FIG. 5, the tire molding drum 1 is rotated. As a result, the pressure roller 3 rotates in the direction opposite to that of the tire molding drum 1, and the surface of the tire constituent member 7B rolls in the drum circumferential direction. It is preferable that the length of the protrusion 6 is larger than the width of the tire constituent member 7B. Thereby, the procedure for moving the pressure roller 3 in the roller axial direction can be omitted.

  Then, as shown in FIG. 6, after rotating the tire forming drum 1 at least once, the actuator 4 is contracted to separate the pressure roller 3 from the surface of the tire constituent member 7B to prepare for the next forming operation. To return to standby mode.

  By doing in this way, tire constituent member 7A, 7B is intermittently pressed along the drum circumferential direction by the protrusion 6 protrudingly provided on the outer peripheral surface of the pressure roller 3, and cannot be handled in the drum circumferential direction. Therefore, the tire constituent members 7A and 7B can be temporarily crimped without generating wrinkles. Further, since the plurality of protrusions 6 are merely provided on the outer peripheral surface of the pressure roller 3 in the conventional molding apparatus, the apparatus has a simple structure and is not complicated.

  Furthermore, since the slack of the tire constituent members 7A and 7B is dispersed over the circumferential direction of the drum, the tire uniformity can be improved. This effect can be further improved by providing a plurality of protrusions 6 at equal intervals in the circumferential direction of the pressure roller 3 so that the slack is evenly distributed in the drum circumferential direction.

  It is desirable that the outer surface of the protrusion 6 has an arc shape protruding toward the outer peripheral side. By doing so, it is possible to prevent the pressing force applied to the tire constituent members 7A and 7B from being localized at the time of contact with the projecting body 6, so that the tire constituent members 7A and 7B are handled in the drum circumferential direction. This makes it difficult to prevent wrinkles and improves the effect of preventing wrinkles.

  In order to ensure the effect of the present invention described above, it is desirable that the outer peripheral surface of the pressure roller 3 does not contact the surface of the tire constituent member 7B when the pressure roller 3 rolls. In order to achieve such a configuration, the number of protrusions 6, the circumferential interval and outer diameter, and the outer diameter of the pressure roller 3 are appropriately set.

  The protruding body 6 can also be provided detachably with respect to the outer peripheral surface of the pressure roller 3. For example, by using fixing means such as screws or screws, a detachable configuration can be achieved. And the multiple types of protrusion body 6 from which the shape and magnitude | size of the part which contacts the tire structural member 7B differ is prepared. If it does in this way, according to the specification of tire constituent members 7A and 7B to carry out temporary pressure bonding, it can be surely and efficiently performed the molding work concerning temporary pressure bonding by selecting the suitable ridge body 6. become.

In the present invention, linear protrusion 6, such as by securing the outer peripheral surface of the pressure roller 3 via the rotary shaft, and is rotatable. By doing so, the tire constituent members 7A and 7B are intermittently pressed at short intervals along the drum circumferential direction, or the pressing force to the tire constituent members 7A and 7B is finely dispersed in the drum circumferential direction. Therefore, the effects of preventing wrinkles and improving tire uniformity can be further improved.

DESCRIPTION OF SYMBOLS 1 Tire molding drum 2 Arm 3 Pressure roller 4 Actuator 5 Center hole 6 Projection body 7A, 7B Tire component

Claims (3)

In a pneumatic tire molding apparatus comprising: a tire molding drum; and a pressure roller that rolls in a circumferential direction of the drum while pressing a surface of a tire constituent member that is laminated and wound around the outer circumferential surface of the tire molding drum.
Rolling on the outer circumferential surface of the pressure roller, a round bar five ridges body consisting extending roller axis, rotatably, projected at equal intervals in the roller circumferential direction, the pressure roller is in the drum circumferential direction In forming the pneumatic tire, the outer peripheral surface of the pressure roller does not contact the surface of the tire constituent member.   The pneumatic tire molding apparatus according to claim 1, wherein the protruding body is made of metal and is fixed to an outer surface of the pressure roller by spot welding.   The pneumatic tire molding apparatus according to claim 1, wherein the protrusion is detachable from the outer peripheral surface of the pressure roller.

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