JP6587524B2 - Tire molding equipment - Google Patents

Description

  The present invention relates to a tire molding apparatus for molding an unvulcanized tire, and more particularly to a tire molding apparatus including a molding drum having a turn-up arm.

  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.

  In the following Patent Document 1, side rings respectively provided at both axial ends of a forming drum, operating means for operating an arm supporting member pivotally attached to a folding arm, the side ring or the arm supporting member are provided. A tire manufacturing apparatus is described that includes an operation control unit that applies a motor driving force to any one of the operating units to operate to generate a relative displacement in the side ring and the operating unit. In this tire manufacturing apparatus, gear teeth are formed on the driven ring at the axially outer end of the side ring, and the side ring is rotated by rotating the gear meshed with the gear. And the arm support member with which the return | turnback arm was pivotally moved is moved by rotation of the side part ring.

  However, in the device of Patent Document 1, it is possible to synchronize the movement of the left and right turnup arms, but the structure becomes complicated and the cost increases.

JP 2013-56445 A

  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 apparatus 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, a tire molding apparatus according to the present invention is a tire molding apparatus including a molding drum having a turn-up arm, and a turn-up driving device disposed on a side of the molding drum,
One end of the turn-up arm is pivotally attached to a turn-up piston that slides in the drum axial direction with respect to the drum body.
The turn-up driving device includes a pressing member that presses the turn-up piston inward in the drum axis direction, and a slide mechanism that slides the pressing member in the drum axis direction by driving the motor.

  In the tire molding device according to the present invention, the pressing member is slid in the drum axis direction by driving the motor, whereby the turn-up piston is moved inward in the drum axis direction by the pressing member. That is, since the turn-up arm is pivotally attached to the turn-up piston, the turn-up arm is moved inward in the drum axial direction by driving the motor. According to the present invention, the structure can be simplified because the turn-up piston is directly pressed by the pressing member. In addition, since the turn-up arm is moved by sliding the pressing member by driving the motor, the movement of the left and right turn-up arms can be accurately synchronized.

  In the tire molding device according to the present invention, it is preferable that the pressing member is formed with a semicircular cutout portion that partially surrounds the outer peripheral surface of the drum main shaft.

Further, in the tire molding apparatus according to the present invention, one end of the turn-up arm is pivotally attached to a flange portion provided at an outer end of the turn-up piston in the drum axial direction.
It is preferable that the pressing member presses the outer surface in the drum axis direction of the flange portion.

  According to these configurations, since the pressing member can press the drum axial direction outer surface of the turn-up piston in a wide range, the turn-up piston can be accurately moved, and the left and right turn-up arms are moved. Can be tuned more accurately.

Front view of the tire molding apparatus of the present invention Side view of turn-up drive Front view showing operation of tire molding apparatus Front view showing operation of tire molding apparatus Front view showing operation of tire molding apparatus Front view showing operation of tire molding apparatus Front view showing operation of tire molding apparatus

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

  The tire forming apparatus of the present invention includes a forming drum 1 having a turn-up arm 14 and a turn-up driving device 2. Since the tire molding device has a substantially bilaterally symmetric structure with respect to the central surface in the drum axis direction of the molding drum 1 (hereinafter referred to as drum shaft central surface C), the left half of the tire molding device is shown in the drawing. Only this will be described.

  The forming drum 1 has a drum main shaft 11. The drum main shaft 11 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 11 has a cylindrical shape, and a ball screw shaft 111 is coaxially provided therein. The ball screw shaft 111 has screw grooves 112 that are opposite to each other with the drum shaft central surface C interposed therebetween. A ball screw nut 113 is screwed into each screw groove 112 of the ball screw shaft 111. Thus, when the ball screw shaft 111 is rotated, the left and right ball screw nuts 113 move in opposite directions at the same speed.

  The forming drum 1 has a drum body 12. The drum main body 12 is connected to the ball screw nut 113 via the connecting portion 121 and moves in conjunction with the ball screw nut 113. That is, the left and right drum main body portions 12 can move in opposite directions at the same speed.

  A bead lock portion 12a is provided along the drum circumferential direction at an end portion (inner end portion in the drum axis direction) near the drum shaft central surface C of the drum main body portion 12. The bead lock portion 12a fixes the bead core 9, and various known structures can be employed.

  A turn-up piston 13 is provided on the outer peripheral surface of the drum body 12. The turn-up piston 13 is slidable in the direction of the drum shaft 1 a with respect to the drum body 12. The turn-up piston 13 can move in a direction away from the center surface C of the drum shaft by injecting air into the space 131 formed between the drum body 12 and the drum body 12. An annular flange portion 13 a is provided at the outer end of the turn-up piston 13 in the drum axial direction.

  The turn-up piston 13 has a plurality of turn-up arms 14 arranged at equal intervals in the circumferential direction. One end of the turn-up arm 14 is pivotally attached to the flange portion 13 a of the turn-up piston 13. A roller 15 is rotatably attached to the other end of the turn-up arm 14.

  A turn-up drive device 2 is arranged on the side of the forming drum 1. The turn-up drive device 2 includes a pressing member 21 and a slide mechanism 22 that slides the pressing member 21 in the direction of the drum shaft 1a.

  The pressing member 21 presses the turn-up piston 13 inward in the drum axial direction. FIG. 2 is a view of the turn-up driving device 2 shown in FIG. 1 as viewed from the left side. The pressing member 21 has a notch 21a. The notch 21a has a semicircular cross section, and the radius of the notch 21a is larger than the radius of the outer peripheral surface of the drum main shaft 11 and smaller than the radius of the outer peripheral surface of the flange portion 13a. Moreover, the radius of the notch 21a is larger than the radius of the outer peripheral surface of the drum body 12 on which the turn-up piston 13 is provided. Thereby, the pressing member 21 can push the drum axial direction outer side surface of the flange part 13a toward the drum axial direction inner side while partially surrounding the outer peripheral surface of the drum main shaft 11 by the notch portion 21a.

  The slide mechanism 22 has a ball screw mechanism, and the pressing member 21 can be reciprocated in the direction of the drum shaft 1a by rotating the ball screw shaft 221 with a motor 222. That is, the slide mechanism 22 can slide the pressing member 21 in the direction of the drum shaft 1a by driving the motor.

  The ball screw shaft 221 is formed with thread grooves that are opposite to each other across the drum shaft central surface C. Therefore, by driving the motor 222 and rotating the ball screw shaft 221, the left and right pressing members 21 can be simultaneously moved at the same speed.

  Further, the entire drive device 2 for turn-up can be moved in a vertical direction and a direction perpendicular to the paper surface of FIG. 1 by a drive device (not shown). Thereby, the drive device 2 for turnup can be moved from the state shown in FIG. 1, and the center axis | shaft of the notch part 21a can be made to correspond with the drum shaft 1a.

  Next, operation | movement of the tire shaping | molding apparatus of this invention is demonstrated.

  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 portion 12a. The bead member includes a bead core 9 and a bead filler.

  Next, by rotating the ball screw shaft 111, the left and right drum main body portions 12 are brought closer to each other, the diameter of the central portion of the cylindrical tire constituent member is expanded, and a toroidal unvulcanized tire T as shown in FIG. Mold.

  Next, the turn-up drive device 2 is moved from the standby position in FIG. 1 so that the central axis of the notch 21a coincides with the drum shaft 1a as shown in FIG. 3A.

  Next, the ball screw shaft 221 is rotated by the motor 222 to move the pressing member 21 inward in the drum axis direction along the drum main shaft 11. Thereby, the flange portion 13a is pushed by the pressing member 21, and the turn-up piston 13 also moves inward in the drum axial direction. As a result, when the turn-up arm 14 pivotally attached to the turn-up piston 13 moves inward in the drum axis direction, and the roller 15 at the tip of the turn-up arm 14 reaches the bead portion of the unvulcanized tire T, Thereafter, as shown in FIG. 3B, the turn-up arm 14 is radially expanded while pressing the side surface of the unvulcanized tire T with the roller 15. Thereby, the roller 15 winds up the edge part (not shown) of a tire structural member so that a bead member may be wrapped. Thereafter, when the pressing member 21 is further moved and the roller 15 reaches the shoulder portion of the unvulcanized tire T as shown in FIG. 3C, the turn-up process of the turn-up arm 14 is finished.

  Next, as shown in FIG. 3D, the turn-up driving device 2 is moved to the initial position of FIG. 3A. Then, as shown in FIG. 3E, by injecting air into the space 131 formed between the turn-up piston 13 and the drum main body 12, the turn-up piston 13 is moved to the initial position of FIG. 3A. Let

<Another embodiment>
(1) In the above-described embodiment, the left and right pressing members are formed by forming thread grooves in opposite directions with the drum shaft central surface C sandwiched between the ball screw shafts 221 and rotating the ball screw shaft 221 with one motor 222. The example which moved 21 in synchronization was shown. However, the left and right pressing members 21 may be moved in synchronization by providing the ball screw shafts independently on the left and right sides and rotating the ball screw shafts while synchronizing them with different motors.

  (2) In the above-described embodiment, as shown in FIG. 3E, the example in which the turn-up piston 13 is moved to the initial position in FIG. 3A by injecting air into the space 131 has been described. However, a connecting means for connecting the pressing member 21 to the turn-up piston 13 may be provided separately, and the turn-up piston 13 may be moved to the initial position by moving the pressing member 21 outward in the drum axial direction. .

DESCRIPTION OF SYMBOLS 1 Molding drum 1a Drum shaft 2 Turn-up drive device 11 Drum main shaft 12 Drum main body part 13 Turn-up piston 13a Flange part 14 Turn-up arm 21 Press member 21a Notch part 22 Slide mechanism 222 Motor

Claims (3)

A tire molding device comprising a molding drum having a turn-up arm and a drive device for turn-up arranged on the side of the molding drum,
One end of the turn-up arm is pivotally attached to a turn-up piston that slides in the drum axial direction with respect to the drum body.
The turn-up drive device includes a pressing member that presses the turn-up piston inward in the drum axial direction, and a slide mechanism that slides the pressing member in the drum axial direction by driving the motor. Tire molding equipment.   The tire molding device according to claim 1, wherein the pressing member is formed with a semicircular cutout portion that partially surrounds the outer peripheral surface of the drum main shaft. One end portion of the turn-up arm is pivotally attached to a flange portion provided at an outer end portion in the drum axial direction of the turn-up piston,
The tire molding device according to claim 1, wherein the pressing member presses an outer surface in the drum axis direction of the flange portion.

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