JP2004130524A - Topping sheet molding apparatus and topping sheet molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a topping sheet molding apparatus which arbitrarily alters a bias angle without requiring huge equipment and a large number of processes. <P>SOLUTION: The topping sheet molding apparatus is equipped with a cord supply mechanism for supplying a strip-like topping cord S wherein a reinforcing cord is topped with rubber, a winding drum mechanism having at least a drive drum 1, which winds the topping cord so as to roll the same to form the belt-like topping sheet, and a follower drum 2 and a drum shaft setting mechanism for inclining the drum shaft of the follower drum 2 with respect to the other drum shaft. In a topping cord winding process, the topping cord is wound around a winding drum in such a state that the drum shafts of the drive drum 1 and the follower drum 2 are inclined relatively. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a molding apparatus and a molding method for molding a topping sheet in which rubber is topped on a reinforcing cord.
[0002]
[Prior art]
A reinforcing cord is used for a carcass layer (carcass ply) and a belt layer (belt ply) of a pneumatic tire. In order to form a rubber layer such as a carcass layer or a belt layer, it is necessary to form a topping sheet in which rubber is topped on one or both sides of a reinforcing cord parallel body in which reinforcing cords are arranged in parallel. As a general method of forming a topping sheet, there is a calendar forming method.
[0003]
[Problems to be solved by the invention]
However, the calender molding method has a problem that the equipment is huge and complicated, and is not suitable for small lot multi-product production. In the calender molding method, the topping sheet is usually supplied through a cutting step. However, due to the configuration of the equipment, if the bias angle of the topping sheet is arbitrarily changed, the number of man-hours increases and causes an increase in cost.
[0004]
As a molding method that does not rely on the calender molding method, there is a strip wind molding machine disclosed in JP-A-2000-108222. This molding machine is a machine for continuously winding a strip made of unvulcanized rubber around a rotary body for forming a tire to form a tire component on which the strip is laminated. However, this molding machine has, due to its properties, little variety in the size of the topping sheet. Further, when supplying the strip, the strip material is cut out from the sheet material, and the remaining portion obtained by cutting out the strip material is reused, but this is not preferable in terms of production efficiency.
[0005]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a topping sheet forming apparatus and a forming method capable of arbitrarily changing a bias angle without requiring a huge facility and without requiring a large number of man-hours. It is to be.
[Means for Solving the Problems]
In order to solve the above problems, a topping sheet forming apparatus according to the present invention includes:
A cord supply mechanism for supplying a strip-like topping cord in which a reinforcing cord is topped with rubber,
A winding drum mechanism having at least a first winding drum and a second winding drum for winding the topping cord to form a belt-like topping sheet;
A drum axis setting mechanism that inclines one of the drum axes of the first winding drum and the second winding drum with respect to the other drum axis,
In the step of winding the topping cord, the topping cord is wound while the drum axes of the first winding drum and the second winding drum are relatively inclined. is there.
[0006]
The operation and effect of such a topping sheet forming apparatus are as follows. First, a cord supply mechanism is provided to supply a strip-like topping cord in which a reinforcing cord is topped with rubber. The topping cord is supplied to a winding drum mechanism having at least a first winding drum and a second winding drum. The topping cord is wound around the first winding drum and the second winding drum to form a belt-like topping sheet. However, in order to form a sheet material from a strip-shaped topping cord, it is necessary to wind the cord while relatively moving the topping cord along the drum axis of the winding drum.
[0007]
Therefore, in the present invention, the drum shafts of the first winding drum and the second winding drum can be relatively inclined. By winding the topping code while the drum axes are inclined, the topping code automatically moves along the drum axis. That is, there is no need for a moving mechanism for moving the winding drum along the drum axis or a moving mechanism for moving the cord supply mechanism along the drum axis. What is necessary is just to provide the drum axis setting mechanism which inclines the drum axis of a winding drum. Also, by changing the angle of inclination, the size of the topping sheet to be created can be arbitrarily changed. The topping sheet formed by the winding drum mechanism has a belt shape. By cutting the belt, a flat sheet can be obtained. Further, by selecting the cutting angle, the bias angle can be arbitrarily changed. The molding apparatus according to the present invention can arbitrarily change the bias angle without requiring a huge facility and without requiring a large number of steps.
[0008]
As a preferred embodiment of the present invention, there is provided a mechanism provided with a mechanism capable of changing the interval between the drum shafts of the first winding drum and the second winding drum.
[0009]
By changing the interval between the drum shafts, the inner diameter of the formed belt can be changed. Thereby, it is possible to easily cope with a change in tire size.
[0010]
As another preferred embodiment of the present invention, the first winding drum is a driving drum, the second winding drum is a driven drum, and the drum shaft setting mechanism is provided on the second winding drum side. Things are raised.
[0011]
In the case where the drum shaft setting mechanism for inclining the drum shaft is provided, by providing the drum shaft setting mechanism on the driven drum, the configuration of the drive mechanism for driving the winding drum does not need to be complicated.
[0012]
In order to solve the above problems, a topping sheet forming method according to the present invention includes:
Supplying a strip-shaped topping cord in which the reinforcing cord is topped with rubber;
Using a winding drum mechanism having at least a first winding drum and a second winding drum, winding the supplied topping cord so as to wind it, thereby creating a belt-like topping sheet;
In the step of winding the topping cord, the topping cord is wound while the drum axes of the first winding drum and the second winding drum are relatively inclined. .
The functions and effects of the molding method are as described above.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
A preferred embodiment of a topping sheet forming apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of the topping sheet forming apparatus according to the present embodiment, FIG. 2 is a side view, and FIG. 3 is a plan view.
[0014]
<Structure>
This topping sheet forming apparatus includes a driving drum 1 and a driven drum 2 arranged in a vertical direction. The driving drum 1 (corresponding to the first winding drum) is arranged on the upper side, and is connected to the motor 3. The driven drum 2 (corresponding to the second winding drum) is disposed below. The driving drum 1 and the driven drum 2 correspond to a winding drum mechanism. The driving drum 1 is supported by a first drum shaft 4, and the driven drum 2 is supported by a second drum shaft 5. The first drum shaft 4 is fixed to the frame, but the second drum shaft 5 has a drum shaft setting mechanism that can be inclined with respect to the first drum shaft 4. The area where the second drum shaft 5 is movable is in a horizontal plane. Therefore, as shown in FIG. 1, the driven drum 2 can swing in the direction of arrow A. A stitcher roller 6 is provided on the upper surface of the driving drum 1 and has a function of pressing a topping code against the drum surface.
[0015]
The strip-shaped topping cord in which the reinforcing cord is topped with rubber is transferred from the direction of arrow B in the figure. Known techniques can be used for the method of topping the reinforcing cord with rubber and the cord supply mechanism. The supplied topping cord is wound so as to be wound between the driving drum 1 and the driven drum 2. The winding direction is clockwise (the direction of arrow C in FIG. 1).
[0016]
<Action>
Next, the operation of the topping sheet forming apparatus will be described with reference to FIG. (A) is a state before the start of winding. The axis of the driving drum 1 is denoted by 1a, and the axis of the driven drum 2 (shown by broken lines) is denoted by 2a. The axis 2a is inclined by an angle θ with respect to the axis 1a. This inclination angle θ can be changed. A narrow topping cord is wound around the driving drum 1 and the driven drum 2.
[0017]
(B) is a state where the winding amount is less than one rotation. (C) shows a state where it is wound one or more turns. Since the axis 2a of the driven drum 2 is inclined with respect to the axis 1a, the winding is shifted by one pitch in the second rotation. Thus, the winding is automatically shifted in the direction of arrow E. As the winding progresses gradually, it becomes as shown in FIG. Thereby, a topping sheet can be formed.
[0018]
The size of the driving drum 1 and the driven drum 2 can be appropriately set according to the size of the topping sheet to be formed. The topping sheet formed as described above is formed in a ring shape. By cutting this ring-shaped topping sheet, a planar topping sheet can be obtained.
[0019]
Further, by making it possible to change the distance between the shafts of the driving drum 1 and the driven drum 2, ring-shaped topping sheets having different inner diameters can be formed. In this case, if the inter-axis distance is changed by moving the driven drum 2 in the vertical direction, the configuration is simplified. Further, when cutting the ring-shaped topping sheet, the bias angle can be changed by changing the cutting angle. As described above, according to the molding method of the present invention, the bias angle of the topping sheet can be easily changed, which is suitable for small lot multi-product production. Also, the equipment configuration does not need to be increased in size as compared with the calendar molding method.
[0020]
<Another embodiment>
In the present embodiment, the number of winding drums is two, that is, a driving drum and a driven drum. However, three or more winding drums may be provided. This can contribute to diversification of the size of the topping sheet. Further, of the plurality of winding drums, which winding drum is inclined can be set arbitrarily. When the drum shaft is tilted, the range in which the drum shaft can be tilted and the setting of the tilt angle can be arbitrarily set. However, the configuration of the drum shaft setting mechanism is simplified when provided on the driven drum.
[Brief description of the drawings]
1 is a front view of a topping sheet forming apparatus according to the embodiment; FIG. 2 is a side view of the topping sheet forming apparatus according to the embodiment; FIG. 3 is a plan view of the topping sheet forming apparatus according to the embodiment; 4 is a diagram for explaining the operation of the topping sheet forming apparatus.
Reference Signs List 1 driving drum 1a axis 2 driven drum 2a axis 4 first drum shaft 5 second drum shaft

Claims (4)

A cord supply mechanism for supplying a strip-like topping cord in which a reinforcing cord is topped with rubber,
A winding drum mechanism having at least a first winding drum and a second winding drum for winding the topping cord to form a belt-like topping sheet;
A drum axis setting mechanism that inclines one of the drum axes of the first winding drum and the second winding drum with respect to the other drum axis,
The topping sheet is characterized in that in the step of winding the topping cord, the topping cord is wound in a state where the drum axes of the first winding drum and the second winding drum are relatively inclined. Molding equipment. The topping sheet forming apparatus according to claim 1, further comprising a mechanism capable of changing a distance between the drum shafts of the first winding drum and the second winding drum. 3. The drum according to claim 1, wherein the first winding drum is a driving drum, the second winding drum is a driven drum, and the drum shaft setting mechanism is provided on the second winding drum side. The topping sheet molding apparatus according to the above. Supplying a strip-like topping cord in which the reinforcing cord is topped with rubber;
Using a winding drum mechanism having at least a first winding drum and a second winding drum, winding the supplied topping cord so as to wind it, thereby forming a belt-like topping sheet;
Wherein the topping cord is wound in the step of winding the topping cord while the drum axes of the first winding drum and the second winding drum are relatively inclined. Method.

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