JP2017100294A - Tire molding drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire molding drum capable of exactly synchronizing movement of right and left turn-up arms while being in simple structure.SOLUTION: A tire molding drum 1 for molding an unvulcanized tire T is provided with: a tail side support member 21 which is slidable in a drum shaft direction; a head side support member 22 which is slidable in the drum shaft direction; a plurality of tail side arms 31; a plurality of head side arms 32; a tail side driving mechanism 41 which is arranged outside the drum direction than a head side drum 12, and outside a drum main shaft 13; a cylindrical coupling member 415 which is slidable in the drum shaft direction between an outer peripheral surface of the drum main shaft 13 and a tail side drum 11, and an inner peripheral surface of the head side drum 12, and couples the tail side support member 21 with the tail side driving mechanism 41; and a head side driving mechanism 42 which is arranged outside the drum shaft direction than the head side drum 12, and outside the drum main shaft 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tire molding drum for molding an unvulcanized tire.

  Conventionally, when forming an unvulcanized tire, a so-called turn-up has been performed in which a bead portion is formed by winding up the end portion in the width direction of a tire constituent member such as a carcass wound around a forming drum so as to cover the bead member. As one of the turn-up methods, there is known a method of winding up a width direction end portion of a tire constituent member with a roller attached to a turn-up arm.

  The movement of the turn-up arm has been mainly performed by air drive. However, in order to use air as a thrust, the turn-up arm having a low resistance is pushed first, and the turn-up arm having a high resistance is pushed later. In other words, it is difficult to accurately synchronize the movement of the left and right turn-up arms with air drive, and the molding accuracy of the unvulcanized tire may be deteriorated.

  Patent Document 1 listed below describes a tire assembly drum that assembles an unvulcanized tire using tire components. In this tire assembly drum, four push-pull rods are concentrically arranged in the drum main shaft, the first push-pull rod is a folding arm unit of the first half-drum, and the second push-pull rod is the second push-pull rod. The second half-drum folding arm unit, the third push-pull rod are coupled to the first half-drum, and the fourth push-pull rod is coupled to the second half-drum. Then, the movement of the left and right turn-up arms is synchronized by moving the first push-pull rod and the second push-pull rod in opposite directions at the same speed using a ball screw mechanism.

  However, in the device of Patent Document 1, it is possible to synchronize the movement of the left and right turn-up arms, but the mechanism is complicated due to the configuration in which four push-pull rods are arranged in the drum spindle, and the cost increases. . In addition, since a complicated drive mechanism is disposed around the bearing of the drum main shaft, it is necessary to lengthen the drum main shaft, and it is difficult to ensure strength.

Special table 2011-525447 gazette

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tire molding drum that can accurately synchronize the movement of the left and right turn-up arms with a simple structure.

The above object can be achieved by the present invention as described below. That is, the tire molding drum according to the present invention is a tire molding drum for molding an unvulcanized tire,
A tail side drum and a head side drum supported by the drum main shaft;
A tail side support member slidable in the drum axial direction on the outer peripheral surface of the tail side drum;
A head-side support member capable of sliding in the drum axial direction on the outer peripheral surface of the head-side drum;
A plurality of tail-side arms that are pivotally attached to the tail-side support member and arranged at equal intervals in the circumferential direction on the tail-side support member;
A plurality of head-side arms, one end of which is pivotally attached to the head-side support member and arranged at equal intervals in the circumferential direction on the head-side support member;
A tail-side drive mechanism that is disposed outside the drum main shaft and outside the drum main shaft with respect to the head-side drum, and slides the tail-side support member;
A cylinder that is slidable in the drum axis direction between the outer peripheral surface of the drum main shaft and the inner peripheral surfaces of the tail side drum and the head side drum, and that connects the tail side support member and the tail side drive mechanism. A connecting member having a shape;
A head-side drive mechanism that is disposed outside the drum main shaft and outside the drum main shaft with respect to the head-side drum and that slides the head-side support member.

  In the tire forming drum of the present invention, since the connecting member that connects the tail side support member and the tail side drive mechanism is disposed outside the drum main shaft, the structure can be simplified. Further, since the tail side drive mechanism and the head side drive mechanism are arranged outside the drum main shaft and outside the drum main shaft with respect to the head side drum, the structure around the bearing of the drum main shaft can be simplified. Further, by synchronizing the tail drive mechanism and the head drive mechanism, the movement of the left and right turn-up arms (tail arm and head arm) can be accurately synchronized.

  In the tire molding drum of the present invention, the connecting member includes a flange portion positioned on the outer side in the drum axial direction than the tail side drum, and extends toward the inner side in the drum axial direction from the outer peripheral end of the flange portion. It is preferable to provide the cylindrical part connected with a member.

  According to this structure, a tail side support member and a tail side drive mechanism can be connected, without a connection member interfering with a tail side drum.

  The tire molding drum of the present invention preferably includes a control device that synchronizes the tail side drive motor of the tail side drive mechanism and the head side drive motor of the head side drive mechanism.

  According to this configuration, the movement of the left and right turn-up arms can be synchronized more accurately.

Front view of the tire molding drum of the present invention Front view showing the operation of the tire forming drum Front view showing the operation of the tire forming drum

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a tire forming drum according to the present invention. However, for convenience of explanation, a part is a cross-sectional view in the drum axis direction.

  A tire molding drum according to the present invention includes a tail side drum 11 and a head side drum 12 on both sides of a center surface in the drum axis direction (hereinafter referred to as drum shaft center surface C). The tail side drum 11 and the head side drum 12 are cylindrical.

  The forming drum 1 has a drum main shaft 13. The drum main shaft 13 is connected to a motor (not shown), and the forming drum 1 is rotated around the drum shaft 1a by the motor.

  The drum main shaft 13 has a cylindrical shape, and a ball screw shaft 131 is coaxially provided therein. The ball screw shaft 131 is connected to the drum motor 14 via the belt 15, and the ball screw shaft 131 is rotated around the drum shaft 1 a by the drum motor 14.

  The ball screw shaft 131 has screw grooves 132 that are opposite to each other across the drum shaft central surface C. A ball screw nut 133 is screwed into each thread groove 132 of the ball screw shaft 131. Thus, when the ball screw shaft 131 is rotated, the left and right ball screw nuts 133 move in opposite directions at the same speed.

  The tail side drum 11 and the head side drum 12 are each connected to a ball screw nut 133 via a connecting pin 134 and move in conjunction with the ball screw nut 133. That is, the tail side drum 11 and the head side drum 12 can move in the opposite directions at the same speed along the drum main shaft 13.

  Bead lock portions 11a and 12a are provided along the drum circumferential direction at the ends (inner end in the drum axis direction) of the tail side drum 11 and the head side drum 12 close to the drum shaft central surface C. The bead lock portions 11a and 12a are for fixing the bead core 9, and various known structures can be employed.

  On the outer peripheral surface of the tail side drum 11, a ring-shaped tail side support member 21 is provided. The tail side support member 21 is slidable on the outer peripheral surface of the tail side drum 11 in the direction of the drum shaft 1a.

  The tail side support member 21 has a plurality of tail side arms 31 arranged at equal intervals in the circumferential direction. One end of the tail side arm 31 is pivotally attached to the tail side support member 21. A roller 31 a is provided at the other end of the tail side arm 31.

  On the outer peripheral surface of the head side drum 12, a ring-shaped head side support member 22 is provided. The head-side support member 22 can slide on the outer peripheral surface of the head-side drum 12 in the direction of the drum shaft 1a.

  The head side support member 22 has a plurality of head side arms 32 arranged at equal intervals in the circumferential direction. One end of the head side arm 32 is pivotally attached to the head side support member 22. A roller 32 a is provided at the other end of the head side arm 32.

  A tail side drive mechanism 41 and a head side drive mechanism 42 are provided on the outer side of the drum main shaft 13 outside the head side drum 12 in the drum axis direction. The tail side drive mechanism 41 slides the tail side support member 21, and the head side drive mechanism 42 slides the head side support member 22. The tail side drive mechanism 41 transmits the rotation of the ball screw shaft 411, the ball screw nut 412 screwed into the thread groove of the ball screw shaft 411, the tail side motor 413, and the rotation of the tail side motor 413 to the ball screw nut 412. Belt 414. Thus, when the tail motor 413 is rotated, the ball screw nut 412 is rotated, and the ball screw shaft 411 can be moved in a direction parallel to the drum shaft 1a.

  A connecting member 415 for connecting the tail side drive mechanism 41 and the tail side support member 21 is provided between the outer peripheral surface of the drum main shaft 13 and the inner peripheral surfaces of the tail side drum 11 and the head side drum 12. The connecting member 415 has a cylindrical shape as a whole, and can slide along the drum main shaft 13 in the direction of the drum shaft 1a. One end of the connecting member 415 is connected to the ball screw shaft 411 of the tail side drive mechanism 41, and the other end of the connecting member 415 is connected to the drum shaft direction outer surface of the tail side support member 21. Thereby, the tail side support member 21 can move in a direction parallel to the drum shaft 1 a in conjunction with the ball screw shaft 411.

  One end of the connecting member 415 extends to the outside in the drum axis direction from the head side drum 12, and the other end extends to the outside in the drum axis direction from the tail side drum 11. A flange portion 415a is formed at the other end of the connecting member 415. A cylindrical portion 415b extends from the outer peripheral end of the flange portion 415a toward the inside in the drum axial direction. The cylindrical portion 415 b is connected to the tail side support member 21.

  The head side drive mechanism 42 also has substantially the same structure as the tail side drive mechanism 41, and includes a ball screw shaft 421, a ball screw nut 422 screwed into a thread groove of the ball screw shaft 421, and a head side motor 423. And a belt 424 that transmits the rotation of the head side motor 423 to the ball screw nut 422. Accordingly, when the head side motor 423 is rotated, the ball screw nut 422 is rotated, and the ball screw shaft 421 can be moved in a direction parallel to the drum shaft 1a.

  The ball screw shaft 421 is connected to the head side support member 22, and the head side support member 22 can move in a direction parallel to the drum shaft 1 a in conjunction with the ball screw shaft 421.

  Next, the operation of the tire molding drum of the present invention will be described.

  First, a tire constituent member including an inner liner, a carcass ply, a side rubber and the like is wound around the outer peripheral surface of the molding drum 1. Next, a ring-shaped bead member is set outside the tire constituent member and at the outer peripheral position of the bead lock portions 11a and 12a. The bead member includes a bead core 9 and a bead filler.

  Next, by rotating the ball screw shaft 131, the tail side drum 11 and the head side drum 12 are brought close to each other, the diameter of the central portion of the cylindrical tire constituent member is increased, and the toroidal unvulcanized shape as shown in FIG. 2A is obtained. The tire T is molded.

  Next, the ball screw shaft 411 of the tail side drive mechanism 41 is rotated, and the tail side support member 21 is moved along the tail side drum 11 inward in the drum axis direction. Further, the ball screw shaft 421 of the head side drive mechanism 42 is rotated to move the head side support member 22 inward in the drum axis direction along the head side drum 12. The tail side motor 413 and the head side motor 423 are synchronized by a control device (not shown) so that the tail side support member 21 and the head side support member 22 move synchronously at the same timing and at the same speed.

  Thereby, the tail side arm 31 pivotally attached to the tail side support member 21 moves inward in the drum axial direction, and when the roller 31a at the tip of the tail side arm 31 reaches the bead portion of the unvulcanized tire T, Thereafter, as shown in FIG. 2B, the tail-side arm 31 is radially expanded while pressing the side surface of the unvulcanized tire T with the roller 31a. Thereby, the roller 31a winds up the edge part (not shown) of a tire structural member so that a bead member may be wrapped. Thereafter, the tail-side support member 21 is further moved, and when the roller 31a reaches the shoulder portion of the unvulcanized tire T as shown in FIG.

  Similarly, when the head side arm 32 pivotally attached to the head side support member 22 moves inward in the drum axis direction, and the roller 32a at the tip of the head side arm 32 reaches the bead portion of the unvulcanized tire T, After that, as shown in FIG. 2B, the head side arm 32 expands radially while pressing the side surface of the unvulcanized tire T with the roller 32a. Thereby, the roller 32a winds up the edge part (not shown) of a tire structural member so that a bead member may be wrapped. Thereafter, the head-side support member 22 is further moved, and when the roller 32a reaches the shoulder portion of the unvulcanized tire T as shown in FIG.

  Next, the ball screw shaft 411 of the tail side drive mechanism 41 is reversely rotated to move the tail side support member 21 outward along the tail side drum 11 in the drum axis direction. Further, the ball screw shaft 421 of the head side drive mechanism 42 is rotated in the reverse direction, and the head side support member 22 is moved along the head side drum 12 outward in the drum axis direction. Thereby, the tail side arm 31 and the head side arm 32 are moved to the initial position of FIG. 2A.

<Another embodiment>
In the embodiment described above, the tail side support member 21 and the head side support member 22 are moved in synchronization by synchronizing the tail side motor 413 and the head side motor 423. However, the ball screw shaft 411 of the tail side drive mechanism 41 and the ball screw shaft 421 of the head side drive mechanism 42 may be rotated in synchronization with one motor.

DESCRIPTION OF SYMBOLS 1 Tire shaping drum 1a Drum shaft 11 Tail side drum 12 Head side drum 13 Drum main shaft 21 Tail side support member 22 Head side support member 31 Tail side arm 32 Head side arm 41 Tail side drive mechanism 42 Head side drive mechanism 413 Tail side drive Motor 415 Connecting member 415a Flange portion 415b Cylindrical portion 423 Head side drive motor

Claims (3)

A tire molding drum for molding an unvulcanized tire,
A tail side drum and a head side drum supported by the drum main shaft;
A tail side support member slidable in the drum axial direction on the outer peripheral surface of the tail side drum;
A head-side support member capable of sliding in the drum axial direction on the outer peripheral surface of the head-side drum;
A plurality of tail-side arms that are pivotally attached to the tail-side support member and arranged at equal intervals in the circumferential direction on the tail-side support member;
A plurality of head-side arms, one end of which is pivotally attached to the head-side support member and arranged at equal intervals in the circumferential direction on the head-side support member;
A tail-side drive mechanism that is disposed outside the drum main shaft and outside the drum main shaft with respect to the head-side drum, and slides the tail-side support member;
A cylinder that is slidable in the drum axis direction between the outer peripheral surface of the drum main shaft and the inner peripheral surfaces of the tail side drum and the head side drum, and that connects the tail side support member and the tail side drive mechanism. A connecting member having a shape;
A tire-forming drum, comprising: a head-side drive mechanism that is disposed on the outer side of the drum main shaft and on the outer side of the drum main shaft with respect to the head-side drum, and slides the head-side support member.   The connecting member includes a flange portion positioned on the outer side in the drum axial direction than the tail side drum, and a cylindrical portion extending from the outer peripheral end of the flange portion toward the inner side in the drum axial direction and connected to the tail side supporting member. The tire forming drum according to claim 1, comprising: The tire molding drum according to claim 1, further comprising a control device that synchronizes a tail side drive motor of the tail side drive mechanism and a head side drive motor of the head side drive mechanism.

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