JPH0414193Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tread wrinkle prevention device for a tire molding machine.

(Prior art) In tire molding, a ply cord is wrapped around the outer periphery of a tire molding drum, and after a bead is set, a tread is wrapped around the outer periphery of the tire. In order to ensure complete contact between the two, stretching is performed by pressing the outer periphery of the tread with a roller.

That is, stretching involves pressing a pair of left and right rollers close to each other and pressing the rollers against the axial center of the outer periphery of the tread, and moving each roller to both ends in the axial direction while rotating the forming drum to stretch the ply cord. The air between the tread and the tread is expelled from both ends to ensure complete contact between the two.

At this time, if the ends of the ply cord and the tread come into close contact with each other before the internal air is discharged, the discharge of the internal air is blocked and wrinkles occur. Conventionally, when wrapping a tread, a tapered roller is inserted between the ply cord and the tread from the axial direction of the forming drum, the tapered roller is fixed to a fixed member, and then the stretching roller approaches both ends. Then, the movement of the stretching roller was temporarily stopped, the fixation of the taper roller was released, the forming drum was pulled out in the axial direction, and the stretching roller was moved again.

(Problems to be Solved by the Invention) In the conventional stretching method, the tapered rollers are manually inserted and extracted, which has caused problems in terms of quality, productivity, and safety.

Therefore, an object of the present invention is to provide a tread wrinkle prevention device for a tire molding machine that automates the above-mentioned operations.

(Means for solving the problems) In order to achieve the above object, the present invention takes the following measures. That is, the features of the present invention are that a tread is wound around the outer periphery of a ply cord wound around a forming drum, and while the forming drum is rotated, the outer periphery of the tread is pressed by a stretching roller;
The roller is moved from the axial center of the tread to both ends to expel air interposed between the ply cord and the tread, and when the tread is wound around the forming drum, the air between the ply cord and the tread is removed at both ends of the tread. When the stretching roller approaches both ends of the tread, the stretching roller is placed parallel to the axial center of the forming drum to prevent the two from coming into close contact with each other. A tapered needle-shaped blocking member whose position can be freely changed between the intersecting positions is provided on a rotating means that is rotatable about the radial axis of the forming drum, and the rotating means is configured to rotate around the radial axis of the forming drum. The stretching roller is provided with a linear motion means for approaching and leaving the forming drum from the radial direction, and the rotating means automatically performs a rotating motion when the stretching roller approaches both ends of the tread. The blocking member is operatively connected to a stretching roller moving device in order to change the position of the blocking member from a position parallel to the forming drum to a retracted position.

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

In FIG. 1, 1 is a forming drum of a tire forming machine. The forming drum 1 is rotatably supported and has a ply cord 2 wrapped around its outer periphery.
A pair of left and right stretching rollers 3 are rotatably arranged in front of the forming drum 1. The stretching roller 3 is movable forward and backward relative to the outer periphery of the forming drum 1 by a moving device (not shown), and is also movable in the axial direction of the forming drum 1. In this axial movement, the pair of left and right rollers 3 are configured to move in opposite directions.

4 is a wrinkle prevention device, which is arranged at the rear of the forming drum 1. This wrinkle prevention device 4 has a base plate 5, and the base plate 5 is movable in the front and rear direction by rotating a front and rear adjustment handle 6. A pair of left and right sub-plates 7 are provided on the base plate 5, and by rotating a width adjustment handle 8, the sub-plates 7 are moved in opposite directions to adjust the distance between them.

A cylinder 9 for forward and backward movement is fixed on each sub-plate 7, and a piston rod 1 is attached to the cylinder 9.
0 is fitted in the piston rod 10 so as to be movable in the front and rear direction, and a midway portion of the mounting frame 11 is fixed to the tip of the piston rod 10. A guide rod 12 is fixed to one end of the mounting frame 11 in parallel with the piston rod 10. This guide rod 12 is slidably fitted into a guide member 13 fixed to the sub-plate 7. Further, a rotary cylinder 14 is fixed to the other end of this mounting frame 11, and a bearing case 16 is fixed to a rotating shaft 15 of the rotary cylinder 14. Thus, the forward/reverse cylinder 9 and the piston rod 10 constitute the linear motion means of the present invention, and the rotary cylinder 14 and the rotating shaft 15 constitute the rotation means.

A tapered roller 17, which is a blocking member, is rotatably supported by the bearing case 16. The axial center of this taper roller 17 is orthogonal to the axial center of the rotating shaft 15, and the rotating shaft 15 is connected to the piston rod 1.
0 in parallel.

Piston rod 10 of the cylinder 9 for forward and backward movement
By moving forward, the taper roller 1
7 moves from the position shown by the solid line in FIG. 1 to the position shown by the imaginary line, and comes into contact with the surface of the ply cord 2 on the outer periphery of the forming drum 1. Also, the rotary cylinder 14
By rotating the rotating shaft 15, the tapered roller 17 is retracted from the surface of the ply cord 2.
Therefore, the position control device 1 of the taper roller 17 is controlled by the forward/reverse cylinder 9, the rotary cylinder 14, etc.
8 are made up.

The position control device 18 and a moving device (not shown) for the stretching roller 3 are interlocked and connected via an interlocking connection means (not shown). That is,
This interlocking connection means is constructed using electrical means or fluid, and is constructed so that the tapered roller 17 is retracted from the surface of the ply cord 2 in conjunction with the movement of both ends of the stretching roller 3 in the axial direction. There is.

Next, the operation of the device will be explained with reference to FIGS. 2 and 3.

As shown in FIG. 1, a ply cord 2 is attached to the forming drum 1 with beads 19 (see FIGS. 2 and 3) set, and treads 20 (second and third To wrap the ply cord (see figure), first, the piston rod 10 of the forward/reverse cylinder 9 is extended, and the tapered rollers 17 are brought into contact with both ends of the ply cord 2.

Next, as shown in FIG.
Wrap the tread 20 around the outer circumference of the ply cord 2 so as to wrap it around the ply cord 2. Then, the stretching roller 3 is brought into contact with the outer peripheral surface of the tread 20 and pressed in the radial direction.

Next, as shown in FIG. 3, while rotating the forming drum 1, a pair of left and right stretching rollers 3 are
is moved to both ends in the axial direction to expel the air present between the ply cord 2 and the tread 20. At this time, the tapered roller 17 is located between the ply cord 2 and the tread 20 to prevent the two ends from coming into close contact with each other and to help discharge the air inside. When the stretching roller 3 approaches the tapered roller 17, the rotating shaft 15 of the rotary cylinder 14 rotates, and the tapered roller 17 is retracted outward from between the ply cord 2 and the tread 20. After that, the stretching roller 3 is moved to the stretching roller 2.
The ply cord 2 and the tread 20 are brought into close contact with each other by moving to both ends of the ply cord 2.

Note that the present invention is not limited to the above embodiments.

(Effects of the invention) According to the invention, the blocking member is configured to move by the linear motion means and the rotation means, so the device can be made compact, and the blocking member is moved by the stretching roller. Since it is configured to retract in conjunction with the movement of the handle, it does not create wrinkles in the sidewall of the toledo.
Complete adhesion can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIGS. 2 and 3 are operation explanatory diagrams. 1... Forming drum, 2... Ply cord, 3...
...Stretching roller, 4...Wrinkle prevention device,
17...Blocking member (taper roller), 18...Position control device, 20...Tread.

Claims (1)

[Claim for Utility Model Registration] A tread is wound around the outer periphery of a ply cord wrapped around a forming drum, and while the forming drum is rotated, the outer periphery of the tread is pressed by a stretching roller.
and the roller is moved from the axial center of the tread to both ends to expel air interposed between the ply cord and the tread, wherein when the tread is wound around the forming drum, the ply cord and the tread are moved at both ends of the tread. The stretching roller is inserted between the treads so as to be parallel to the axis of the forming drum to prevent the two from coming into close contact with each other, and the shaft is inserted between the ply cord and the tread so as to be retracted from between the ply cord and the tread when the stretching roller approaches both ends of the tread. A tapered needle-shaped blocking member whose position can be freely changed to a position intersecting the center is provided on a rotating means rotatable about the radial axis of the forming drum, and the rotating means The linear movement means is provided for approaching and leaving the forming drum from the radial direction of the forming drum, and the rotating means automatically performs a rotating movement when the stretching roller approaches both ends of the tread. A tread wrinkle prevention device for a tire building machine, characterized in that the blocking member is operatively connected to a stretching roller moving device to change the position of the blocking member from a position parallel to the forming drum to a retracted position.