JP2011143552A - Tire molding device and molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adhere tire constituent members together on the side part of a tire by a stitching roll and extract the air from the tire. <P>SOLUTION: The tire molding device includes the stitching roll 10 for stitching the side part of the tire, and further, includes a roll position detector for detecting the position of the stitching roll 10, a roll angle changer for changing the slip angle of the stitching roll 10, and a roll angle changing controller for controlling the angle change of the roll angle changer. In addition, the roll angle changing controller changes the slip angle of the stitching roll 10 by controlling the roll angle changer according to a detection output of the roll position detector during stitching. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tire molding apparatus and a molding method including a stitching device that stitches a side tread of a tire.

  In order to form a green tire, beads are set on both ends of the cylindrical carcass and engaged with the carcass so that both ends of the carcass are folded back from the inside to the outside. After shaping into a shape, an annular and endless side tread is pressure-bonded to both sides of the toroidal carcass, and a belt and a tread are attached to the outer peripheral surface to form a green tire, or shaped into the toroidal shape. It is known that after attaching a belt and a tread to the outer circumferential surface of the carcass, a green tire is formed by pressing an annular endless side tread on both sides (see Patent Document 1).

  As described above, in order to prevent the air entering between the tire constituent members of the molded green tire and to improve the pressure-bonding force between the tire constituent members, while rotating the green tire in a state where the tire constituent members are attached, It is generally known to press the surface of a green tire by pressing a stitcher roll.

Although FIG. 3 is not described in the patent document, as an example of a conventional stitching device, the stitching device of the present invention performs stitching of a side tread portion (hereinafter, referred to as a side portion) of a green tire. It is a front view which shows typically the principal part of the stitching apparatus used as a premise.
The stitching apparatus includes a side stitching roll (hereinafter simply referred to as a stitching roll) 10, a support shaft 12 that is provided with a rotatable rotation of the stitching roll 10, and a shaft mounting portion 14a that supports the support shaft 12. The moving frame 16 is integrally provided with, for example, a ball nut screwed to the shaft 18.
The moving frame 16 reciprocates inward and outward in the radial direction of the green tire along the side portion of the green tire according to, for example, rotation of a pulse motor (not shown).

The stitching roll 10 on the side portion is pressed from the surface side of the side portion of the green tire and presses the tire constituent members that constitute the side portion. At that time, the knurled surface of the circumferential surface of the stitching roll 10 is pressed against the side portion, and air is removed by making marks on the side surface, and the tire constituent members are brought into close contact with each other.
The surface of the stitching roll that presses the side tread part is a knurled surface, and irregularities (traces) are added to the surface of the raw tire during stitching, so that the knurling allows the tire components to It is already known that the air is removed and the pressure-bonding force is improved (see Patent Document 2).

By the way, the addition of the unevenness by the knurling easily causes the knurling traces (unevenness) to occur when the rotational direction of the stitching roll and the traveling direction of the stitching roll are shifted (that is, there is a slip angle), and thereby the air When vulcanizing raw tires with molds (molds), there are more discharge paths, so air that has lost escape at the corners is collected, and so-called bears that do not allow rubber to flow sufficiently are reduced. If the corners are very small or zero, the marks are difficult to mark and the air exhaust effect is difficult to increase.
Thus, when stitching is performed by pressing the surface of the raw tire with the stitching roll 10, it is conceivable that a predetermined slip angle is given to the stitching roll 10 in advance.

  For example, in the stitcher device (stitching device) described in Patent Document 3, as shown in FIG. 4, the tangent direction of each roll 110 forms a predetermined inclination angle θ with respect to the tangential direction of the green tire. The roll 110 is supported so as to be rotatable, and the roll 110 is supported so as to move from the center in the width direction of the tire toward both ends in the width direction while being in contact with the unvulcanized tire T. In this stitching apparatus, the guide rail 121 is provided so as to be tiltable with respect to the substrate 122 so that the tilt angle θ of the roll 110 can be arbitrarily changed. However, during the stitching, the tilt angle is maintained constant. The

As described above, if the entire side portion of the tire is stitched while a predetermined slip angle is applied in advance, the tire constituent member folded around the bead member on the side surface of the tire when the slip angle is large. The end portion of the (carcass ply) that is disposed on the outermost radial direction is likely to move during stitching, and it is easy to cause inconveniences such as wrinkles and folding of the end portion.
In view of this point, if the slip angle is made extremely small or zero, a new problem arises that air tends to accumulate near the upper end of the stiffener (bead filler) and bears easily occur.

JP-A-6-64065 WO2004-012928 JP 2006-159572 A

  The present invention has been made to solve the above-described conventional problems, and its object is to allow the slip angle of the stitching roll to be freely changed during the stitching, so It is to improve the performance of green tires and consequently the performance of product tires by coexisting the suppression of occurrence and the like, and the improvement of air bleeding between tire constituent members and the adhesion between the constituent members.

The present invention relates to a tire molding apparatus having a stitching roll for stitching a side portion of a tire, the position detecting means for detecting the position of the stitching roll, and the slip angle on the surface of the side portion of the stitching roll is changed. And a roll angle change control means for controlling the angle change of the roll angle change means, the roll angle change control means based on the detection output of the position detection means during stitching. A tire molding apparatus characterized by controlling a roll angle changing means to change a slip angle of the stitching roll.
Another invention of the present application is a tire molding method in which a side portion of a tire is stitched with a stitching roll, the position detecting step for detecting the position of the stitching roll, and the slip angle on the tire side surface of the stitching roll. A roll angle change step for changing the roll angle change means, and a roll angle change control step for controlling the angle change of the roll angle change means. In the roll angle change control step, position detection is performed during stitching. The tire molding method is characterized in that the roll angle changing means is controlled based on the detection output detected in the process to change the slip angle of the stitching roll.

  According to the present invention, since the slip angle at the tire side surface of the stitching roll can be freely changed during the stitching of the side surface of the tire, the tire configuration at the side portion of the tire is prevented while preventing side wrinkles and the like. The air bleeding between the members and the adhesion can be improved, and the performance of the green tire and hence the performance of the product tire can be improved.

It is a front view which shows roughly the principal part of the stitching apparatus of the tire molding apparatus which concerns on embodiment of this invention. It is a block diagram which shows the control apparatus for performing adjustment control of the slip angle of a stitching roll. It is a front view which shows typically the principal part of the conventional stitching apparatus. It is a front view which shows roughly the principal part of the conventional tire shaping | molding apparatus.

An embodiment of a tire molding apparatus having a stitching apparatus for stitching side portions of a tire according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view of a stitching apparatus in a tire molding apparatus according to an embodiment of the present invention. FIG. 1A shows a case where the slip angle of the stitching roll is zero, and FIG. 1B shows a case where the slip angle is θ. .
The stitching apparatus includes a stitching roll 10, a support shaft 12 that rotatably supports the stitching roll 10, a swing frame 14 that includes a shaft mounting portion 14a that supports the support shaft 12, a swing frame 14, and a hinge. 20, a moving frame 16 connected to a nut 20, a first screw shaft 18 threadedly engaged with a nut in the moving frame 16, for example, a ball nut, and an upper portion of the swing frame 14 in FIG. The connected second screw shaft 24, a nut portion 16a provided on the moving frame 16 provided with a screw groove to be screwed with the screw groove of the second screw shaft 24, and a motor as a driving means, for example, a pulse motor A timing belt 26 laid around a first timing pulley attached to the motor shaft of M, and a second screw shaft A second timing pulley passed mounted on preparative 24 multiplied by the timing belt 26, are made of.

When the first screw shaft 18 is rotated by a motor (not shown), for example, a pulse motor, the stitching device moves the moving frame 16 left and right in FIG. 1 and positions it at a predetermined position on the side portion of the green tire. can do.
At that position, the stitching roll 10 is pressed against the side portion of the rotating green tire to stitch the side portion. By this stitching, irregularities can be added to the surface of the side portion of the raw tire on the circumferential surface of the knurled stitching roll 10.

Here, the slip angle of the stitching roll 10 will be described.
Slip angle is already direction of stitching roll 10 as described and (i.e., perpendicular to the axial direction of the direction of the stitching rolls) and L _1, the relative movement direction L ₂ with respect to the side portion of the green tire of the stitching rolls The slip angle is zero in FIG. 1A, that is, the direction of the steering roll coincides with the traveling directions L ₁ and L ₂ of the steering roll.

Next, the change of the roll angle of the stitching roll from the state of FIG. 1A to the state of FIG. 1B, that is, the state where the slip angle is θ is performed as follows.
That is, the pulse motor M is driven to rotate the rotating shaft 28 by a predetermined amount (angle). When the rotary shaft 28 rotates, the timing pulley attached integrally therewith rotates, the timing belt 26 rotates by the amount of rotation of the timing pulley, and the timing pulley attached to the second screw shaft 24 rotates. By this rotation, the second screw shaft 24 rotates, and the second screw shaft 24 rotates. When the second screw shaft 24 rotates, the tooth portion of the nut meshing with the second screw shaft 24 of the nut portion 16a of the moving frame 16 is guided to the spiral groove of the screw shaft, and the rotational motion is converted into a linear motion. The Therefore, the second screw shaft 24 moves slightly to the right in the drawing (note that this slight movement is within a range that can be absorbed by the extension of the timing pulley, but the second screw shaft 24 and the timing pulley are splined. And may be configured such that the second screw shaft 24 can move relative to the timing pulley).

When the second screw shaft 24 moves to the right in the figure, the swing frame 14 that is pivotably connected via the ball bearing 22 is pushed to the right at its tip. Since the swing frame 14 is coupled to the moving frame 16 by a hinge 20 at the lower end, the swing frame 14 swings slightly around the hinge 20 as shown in FIG. 1B.
When the swing frame 14 swings as shown in FIG. 1B, the shaft 12, which is integrally attached to the shaft mounting portion 14a, and hence the stitching roll 10, is swung to change the slip angle.
The mechanism that swings the stitching roll 10 and changes its angle as described above, that is, the mechanism from the pulse motor to the shaft mounting portion 14a is collectively referred to herein as roll angle changing means. Of these, the portion excluding the pulse motor M as the driving means and the swing frame 14 (including the shaft mounting portion 14a) is referred to as swing means.

Next, the slip angle change control by the pulse motor M will be described.
FIG. 2 is a block diagram showing a control device for performing the slip angle change control by the pulse motor M. As shown in FIG.
The control device 30 includes a microprocessor (MPU) 300, a ROM 302 storing a control program, and a RAM 304 serving as a work area for temporarily storing programs and data necessary for the operation of the MPU 300. The apparatus 30 includes an external storage unit 305, an input unit 306 for data, and a display unit 308 such as a liquid crystal display (LCD) for confirming the input data, if necessary. The control device 30 controls a motor driver circuit 40 which is a means for supplying a drive current to the pulse motor M in accordance with a position detection signal from a position detection means 42 which will be described later. Drive to change the slip angle. Here, the control device 30 and the motor driver circuit 40 are collectively referred to as roll angle change control means.

The position detecting means 42 of the stitching roll 10 is optional, but the intermediate position between the front end and the rear end of the stitching roll 10 is a tire constituent member attached to the side portion of the green tire, for example, the folded end of the carcass ply, for example Alternatively, it may be configured to detect that the position of the mark attached to the position of the stiffener upper end has been reached, or the position information of the folded end of the carcass or the upper end of the stiffener as the distance from the reference position in advance. You may memorize | store it and may detect that the position of the stitching roll 10 reached the said position by the rotation step number from the reference position of the pulse motor M, and you may make it output a detection signal.
Further, the shape of the side portion of the green tire (here, the shape of the folded end of the carcass ply or the shape of the upper end of the stiffener) is stored as an image, and the detection signal when the stitching roll 10 reaches the stored image portion. May be transmitted.

Next, a stitching operation using the stitching apparatus will be described.
According to the present embodiment, when stitching the side portion of the green tire, the stitching is performed in the region from the end of the folded carcass ply to the vicinity of the upper end of the stiffener radially outward. The roll 10 is provided with a slip angle so that the side portions of the green tire are knurled, and the other portions are stitched without adding a slip angle. In other words, wrinkles are generated even if a slip angle is applied in the region from the vicinity of the upper end of the folded carcass ply to the vicinity of the upper end of the stiffener while preventing side wrinkles from occurring due to the stitching roll. Since it is relatively difficult to occur, air is discharged with irregularities due to knurling, and air dispersibility is improved to reduce generation of bears during vulcanization.

  For example, when stitching the side portion of the green tire from the inner side to the outer side in the radial direction, first, the stitching roll 10 is set with a slip angle of zero or very small as shown in FIG. 1A. , While pressing the side of the rotating green tire and rotating the first screw shaft 18 with a pulse motor M (not shown) to move the moving frame 16, and thus the stitching roll 10, that is, the stitching roll 10 Stitching is performed by gradually moving the green tire from the inside to the outside in the radial direction.

  During the stitching, when the position detecting means 42 of the stitching roll 10 detects that the stitching roll 10 has passed the turn-up end of the carcass ply turned back of the green tire, the MPU 300 determines the pulse motor M in advance. In order to rotate the motor by a rotation amount, a motor control signal is sent to the motor driver circuit 40 which is a drive control unit of the pulse motor M.

Upon receiving the motor control signal, the motor driver circuit 40 rotates the pulse motor M by a predetermined amount. Thereby, as described above, the stitching is performed via the rotating shaft 28 of the motor, the first timing pulley, the timing belt 26, the second timing pulley, the second screw shaft 24, the ball bearing 22, and the swing frame 14. As shown in FIG. 1B, the ring roll 10 turns around the hinge 20 by a predetermined slip angle θ. Thereby, the slip angle of the stitching roll 10 with respect to the side surface of the green tire becomes a predetermined angle θ.
Thereafter, stitching is performed while maintaining the slip angle. Eventually, when the stitching roll 10 reaches the position of the upper end of the stiffener, the MPU 300 rotates the pulse motor M by a predetermined amount of rotation based on the detection signal from the position detection means 42 that detected the position. A motor control signal is sent to a motor driver circuit 40 that supplies a drive current to the motor M, the pulse motor M is reversely rotated by an amount equal to the previous rotation amount, and the stitching roll 10 is returned to the slip angle state. Finish stitching with.

As described above, according to the stitching apparatus according to the present embodiment, since the slip angle can be adjusted, the slip angle can be increased according to the position of the side portion, and a lot of knurling marks can be made. Air exhaustability and air dispersibility between the tire and the mold are improved, and bear reduction can be achieved.
On the other hand, the occurrence of side wrinkles can be suppressed by reducing the slip angle according to the position of the side portion. Furthermore, since the slip angle of the stitching roll can be freely adjusted during the stitching of the side portions, it is possible to obtain effects such as no reduction in productivity.

The stitching device is not limited to green tires. For example, in the manufacture of retreaded tires, when stitching is performed by winding an unvulcanized tire retreading member around the side part of a base tire, stitching is widely performed on the side part of the tire. It can also be used for
Further, the motor is not limited to the pulse motor M, and may be another rotational drive mechanism. As the position sensor, for example, the detection roll is brought into contact with the surface of the tire side portion, and a predetermined surface of the contact surface of the detection roll is determined. A contact type device that detects the amount of radial displacement from the position may be used, and the position in the radial direction of the tread portion surface may be calculated from the amount of displacement to detect the position.
Furthermore, the change of the slip angle of the stepping roll on the side surface of the tire is not limited to the above embodiment, and can be performed at an arbitrary position.

DESCRIPTION OF SYMBOLS 10 ... Stitching roll, 12 ... Axis, 14 ... Swing frame, 16 ... Moving frame, 16a ... Nut part, 18 ... First screw shaft, 20 ... Hinge, 22 ... ball bearing, 24 ... second screw shaft, 26 ... timing belt, 28 ... rotating shaft, 30 ... control device, 300 ... microprocessor (MPU), 302 ... ROM, 304 ... RAM, 305 ... external storage means, 306 ... input means, 308 ... display means, 40 ... motor driver circuit, 42 ... position detection means, M: Pulse motor.

Claims (7)

A tire molding apparatus having a stitching roll for stitching a side portion of a tire,
Position detecting means for detecting the position of the stitching roll;
Roll angle changing means for changing a slip angle on the side surface of the stitching roll;
Roll angle change control means for controlling the angle change of the roll angle change means,
The roll angle change control means controls the roll angle change means based on the detection output of the position detection means during stitching to change the slip angle of the stitching roll. In the tire molding apparatus according to claim 1,
The roll angle change control means is configured so that the slip angle of the stitching roll at a position from the vicinity of the folded end of the ply of the side portion of the tire to the radial front end of the stiffener is larger than the slip angle in the other region. A tire molding apparatus that controls roll angle changing means. In the tire molding device according to claim 1 or 2,
The roll angle changing means includes a swing frame provided with the stitching roll that is swingably connected to a moving frame for moving the stitching roll, and swing means for swinging the swing frame; And a driving means for driving the swinging means. In the tire molding apparatus according to claim 1,
The roll angle change control means of the stitching roll controls the drive of the drive means according to a detection signal of the position detection means. In the tire molding device according to claims 1 to 3,
A tire molding apparatus, wherein a knurled surface is formed on a roll surface of the stitching roll. A tire molding method for stitching a side portion of a tire with a stitching roll,
A position detecting step for detecting the position of the stitching roll;
A roll angle changing step of changing the slip angle on the side surface of the tire of the stitching roll with a roll angle changing means;
A roll angle change control step for controlling the angle change of the roll angle change means,
In the roll angle change control step, the roll angle change means is controlled based on the detection output detected in the position detection step during stitching to change the slip angle of the stitching roll. . In the tire molding method according to claim 6,
In the roll angle change control step, the roll is set so that the slip angle of the stitching roll at a position from the vicinity of the turn-back end of the ply of the side portion of the tire to the radial front end of the stiffener is larger than the slip angle in other regions. A tire molding method characterized by controlling the angle changing means.

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