JP3200380B2 - Tire building equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tire molding method and a tire molding apparatus.

[0002]

2. Description of the Related Art Generally, in a radial tire manufacturing process, a tire forming apparatus for crimping (stitching) a carcass, a breaker and a tread conventionally comprises a carcass a, a breaker b and a tread c as shown in FIGS. The component assembly d is held on a drum e, and the component assembly d is filled with air of a predetermined pressure and rotated, and a stitch roller h including a pair of rotatable rollers f, f is moved by a cylinder g into a tread c. While being pressed against the outer peripheral surface, the tread c was moved from the central portion of the outer peripheral surface (as indicated by the imaginary line in FIG. 6) toward both ends of the outer peripheral surface, and was pressed (closely attached).

[0003]

The state of the compression between the carcass a, the breaker b and the tread c is determined by the pressing force and the time for applying the pressing force, but the centrifugal force caused by the rotation of the component assembly d. Therefore, it is necessary to set the cylinder g pressure, the internal pressure of the component assembly d, and the number of rotations according to the shape, thickness, and compound of the tread.

However, if the pressure of the cylinder g and the internal pressure of the component assembly d are increased in order to perform the appropriate stitching, there is a problem that the rate of occurrence of defective products increases. Further, with the pair of rollers f, f, it takes a long time to securely press the carcass a, the breaker b, and the tread c with each other, and there is a problem that productivity is poor.

Accordingly, an object of the present invention is to provide a tire forming method and a tire forming apparatus which solve the conventional problems described above and have excellent productivity and improved tire quality.

[0006]

According to the present invention, in order to achieve the above-mentioned object, one tire forming apparatus according to the present invention comprises:
In a tire forming apparatus in which a breaker and a tread, etc., which are externally fitted on an annular carcass attached to a drum, are pressed in the inner diameter direction to form a close contact, the tread is pressed in the inner diameter direction while the tread is pressed in the tread width direction. A pair of first rollers that expands and spreads, and a pair of second rollers that expands along the tread width direction while being circumferentially shifted with respect to the first roller and pressing the tread in the inner diameter direction; While rotating about one of the first and second rollers as a fulcrum, it is displaced in the tread width direction and the circumferential direction with respect to the rollers, and expands along the width direction of the tread while pressing the tread in the inner diameter direction. And a pair of first auxiliary rollers or a pair of second auxiliary rollers.

Further, another tire forming apparatus according to the present invention is a tire forming apparatus which presses a breaker and a tread or the like which are fitted over an annular carcass attached to a drum in an inner diameter direction to form an intimate contact with the breaker and the tread. A pair of first rollers that expands along the tread width direction while pressing the tread in the inner diameter direction, and a pair of first rollers that are displaced in the circumferential direction with respect to the first roller and press the tread in the inner diameter direction. A pair of second rollers that expands in the width direction, while rotating about the first roller as a fulcrum, displacing the rollers in the tread width direction inside and in the circumferential direction, and pressing the tread in the inner diameter direction; A pair of first auxiliary rollers that expands along the tread width direction, and a pair of first auxiliary rollers that rotate around the second roller as a fulcrum and are displaced outward and circumferentially in the tread width direction with respect to the rollers; A pair of second auxiliary rollers to be widened along the tread width direction while pressing the red radially inward, those having a.

Further, each auxiliary roller has a corresponding first roller.
-It is preferable that the second roller slightly overlaps with the second roller in the tread width direction, and it is preferable that a control unit that independently controls the pressing force of the first roller, the second roller, and the auxiliary roller is provided.

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an overall simplified view of a tire forming apparatus according to the present invention. The apparatus includes a first stitch roller 2 and a second stitch roller 3 arranged side by side in the circumferential direction of a drum 1.

As shown in FIG. 2, the first stitch roller 2 comprises a pair of first rollers 2a, 2a, and the second stitch roller 3 also comprises a pair of second rollers 3a, 3a. That is, the first rollers 2a, 2a are rotatably fitted to the shaft 10 via the bearing 11, and the second rollers 3a, 3a are rotatably fitted to the shaft 12 via the bearing 13. Each of the shafts 10 and 12 is composed of a main body 10a, 12a and threaded portions 10b, 12b protruding from the main body 10a, 12a.
, And a screw portion 12 b of the shaft 12 is screwed to the connecting plate 15.

A first auxiliary roller 16 is disposed outside the first roller 2a, and a second auxiliary roller 16 is disposed outside the second roller 3a.
Of auxiliary rollers 17 are provided. First auxiliary roller 16
Is rotatably fitted to the shaft 18 via a bearing 19, and
The first roller 2a rotates about a fulcrum. That is, the shaft 18 is composed of a main body portion 18a on which the bearing 19 is externally fitted and a screw portion 18b protruding from the main body portion 18a, and the screw portion 18b is externally fitted on the shaft 10 via the bearing 20. The connection plate 21 is screwed.
The second auxiliary roller 17 is fitted on the shaft 22 via a bearing 23. That is, the shaft 22 is provided with a main body 22a on which the bearing 23 is fitted.
And a screw portion 22b protruding from the main body portion 22a. The screw portion 22b is screwed to the connecting plate 15.

By the way, the holding plate 14 of the first roller 2a,
The holding plate 25 holding the second roller 3a is supported by the support frame 8 as shown in FIG. The holding plate 25
As shown in FIG. 2, the shaft is externally fitted to the main body 12 a of the shaft 12 via a bearing 26. The support frame 8 reciprocates along the axial direction of each roller 2a, 3a by a drive mechanism not shown. The first and second rollers 2a and 3a reciprocate (reciprocate) with the main cylinder 24. Therefore, the first and second
As the rollers 2a, 3a reciprocate in the axial direction and move back and forth, the auxiliary rollers 16, 17 also reciprocate in the axial direction and move back and forth.

The connecting plate 21 holding the first auxiliary roller 16 can be swung by a cylinder 27 as shown in FIG. That is, the cylinder 27 has its piston rod
27a is pivotally connected to the connecting plate 21, the end of the main body 27b is pivotally connected to the support frame 8, and the connecting plate is expanded and contracted by the piston rod 27a.
The first auxiliary roller 16 rotates with the first roller 2a as a fulcrum. Further, the connecting plate 15 holding the second auxiliary roller 17 can be swung by a cylinder 28. That is, in the cylinder 28, the piston rod 28a is pivotally connected to the connecting plate 15, the end of the main body 28b is pivotally connected to the support frame 8, and the connecting plate 15 swings due to the expansion and contraction of the piston rod 28a. Of the auxiliary roller 17 rotates about the second roller 3a as a fulcrum.

In FIG. 1, reference numeral 4 denotes a component assembly comprising an annular carcass 5, a breaker 6, and a tread 7. The carcass 5 attached to the drum 1 is covered with a breaker 6 and a dread 7 in an externally fitting manner. 5 is filled with air at a predetermined pressure (for example, 0.5 to 1.5 kg / cm ² ). The drum 1 can be rotated around an axis O in a predetermined direction and at a predetermined number of rotations by a driving device (not shown).

However, the positional relationship between the first stitch roller 2, the second stitch roller 3 and the drum 1 is such that the roller tangent line A and the drum center line B are substantially orthogonal, and the first and second stitch rollers 2, 3 Each rotation axis is set so as to be substantially symmetric with respect to the drum center line B.

Further, first and second stitch rollers 2, 3
, The first and second rollers 2a, 2a, 3a,
3a are substantially symmetrical with respect to a center line R orthogonal to the drum axis O, and are substantially located on circumferential lines C, C parallel to the center line R.

Although the first auxiliary roller 16 is shifted in the circumferential direction with respect to the first roller 2a and shifted inward in the tread width direction, the first roller 2a and the first auxiliary roller 16
16 is an overlap zone (specifically, 1 mm to 8 mm) that slightly overlaps in the drum axis direction (tread width direction).
Degree range). The second auxiliary roller 17 is shifted in the circumferential direction with respect to the second roller 3a and is shifted outward in the tread width direction. However, the second roller 3a and the second auxiliary roller 17 are in the drum axial direction (tread direction). Overlap zone (specifically, 1)
mm to about 8 mm).

Each of the rollers 2a, 3a, 16, 17 has a diameter D of about 50 mm to 100 mm, and each of the rollers 2a, 3a, 3
When the dimension between a, 16 and 17 is L, it is preferable to set 0 <L ≦ 1 / 4D. That is, it is preferable to make L small.

Thus, the tread 7 is pressed by each of the rollers 2a, 3a, 16, 17 and the pressing force is controlled by the control means 30.
Are controlled independently. The control means 30 includes switching valves 31, 32, 33, 34, solenoid valves 35, 36, 37, 38, 39, pressure reducing valves 40, 41, 42, 43, 44, 45, an electropneumatic proportional valve 46, , Is provided. In addition, 48 is an air pressure source.

The procedure of stitching (compression bonding) of the carcass 5, breaker 6, and tread 7 by the tire forming apparatus thus configured, that is, the stitching step will be described.

As shown in FIG. 1, a tread 7 is wound around a carcass 5 which is mounted on the drum 1 and inflated by filling it with air or the like at a predetermined internal pressure via a breaker 6 so as to be fitted externally. The drum 1 is rotated, and the first and second stitch rollers 2 and 3 and the auxiliary rollers 16 and 17 are advanced to press the center of the outer peripheral surface of the tread 7 as shown in FIG.

At this time, the auxiliary rollers 16, 17 are connected to the pressure reducing valves 40, 4
The pressure is directly received from 1, 42, 43, 44, and 45, and the first and second rollers 2a and 3a become the pressure of the electropneumatic proportional valve 46 by the set pressure of the personal computer 47. Then, auxiliary roller 1
Reference numerals 6 and 17 denote switching valves 31 and 32, which are first and second rollers 2a and 2a.
3a is switched to a set high pressure by an electropneumatic proportional valve 46.

Next, the first and second rollers 2a, 2a, 3
a and 3a and the auxiliary rollers 16 and 17 are simultaneously and continuously moved from the central portion of the outer peripheral surface of the tread 7 to both end portions of the outer peripheral surface as shown in FIGS. The treads 7 are brought into close contact with each other.

At this time, the tread 7 is once pressed by the first stitch roller 2 to bring the carcass 5, the breaker 6 and the tread 7 into close contact with each other, and then the centrifugal force due to the rotation of the component assembly 4 and the tread 7 Before the restoring force due to its own rigidity is applied, the tread 7 is pressed again by the next second stitch roller 3 so that the carcass 5, the breaker 6, and the tread 7 can be securely brought into close contact with each other.
In addition, in this case, the auxiliary rollers 16 and 17 are provided on the outer side in the circumferential direction of the first and second stitch rollers 2 and 3, so that the auxiliary rollers 16 and 17 are provided in addition to the first and second stitch rollers 2 and 3. , 17 can press the tread 7, and the tread 7 can be more securely brought into close contact.

That is, by increasing the pressing area, the pressing force of each of the rollers 2a, 3a, 16, 17 can be reduced, and the carcass 5 and the breaker 6 are deformed (distorted).
Can be surely brought into close contact with each other in a state where there is little of. Auxiliary rollers 16 and 17 are first and second rollers 2 respectively.
Since it is rotatable about a and 3a as a fulcrum, it can protrude toward the drum 1 side, whereby the pressure bonding becomes more complete. In addition, the rollers 2a, 3a, 16, 17 are arranged in a substantially U-shape, and can rotate the drum 1 in a direction in which air in the component assembly can be discharged to the outside.

When the stitching is completed, each roller 2a, 3
The components a, 16, 17 are retracted, the component assembly 4 is replaced, and the operation is repeated in the same procedure as described above.

It should be noted that the tire molding apparatus may be provided with only one of the auxiliary rollers 16 and 17. The first rollers 2a, 2a and the second rollers 3a, 3a may be slightly shifted in a front view.
That is, a difference is provided in the pressing force applied to the tread 7 between the first stitch roller 2 and the second stitch roller 3, thereby more effectively bringing the tread 7 into close contact.

[0028]

Since the present invention is configured as described above, the following effects can be obtained.

According to the tire forming apparatus of the first aspect, the area pressed by the tread 7 can be increased, whereby the pressing force of each of the rollers 2a, 3a, 16, 17 can be reduced. At the time of stitching, the deformation of the entire inside of the tire is reduced, and the carcass 5 and the breaker 6 can be securely adhered to each other with little deformation (distortion), so that a high-quality tire can be manufactured. Further, since the process time can be shortened, the cycle time for manufacturing one tire can be shortened, and the productivity can be improved.

According to the tire molding apparatus of the second aspect, the effect of the first aspect is achieved, and the pair of rollers 2 a, 3 a, 16, 17 each have a substantially C-shape when viewed from the drum 1 side. Since it is arranged in a shape, the air interposed in the component assembly can be released during the stitch, and can be more securely brought into close contact. Further, auxiliary rollers 16, 17
Can rotate around the first roller 2a and the second roller 3a, respectively, so that they protrude toward the drum 1 and can be stitched along the shape of the raw cover.

According to the tire molding apparatus of the third aspect, the entire tread 7 can be reliably pressed, and the tread 7 and the like can be adhered with high quality.

According to the tire forming apparatus of the fourth aspect, each part can be pressed with a pressing force suitable for the part, and thereby, an optimal stitch can be performed.

[Brief description of the drawings]

FIG. 1 is a simplified diagram of a tire forming apparatus according to the present invention.

FIG. 2 is a sectional view of a main part.

FIG. 3 is an explanatory view of a stitch state.

FIG. 4 is an explanatory view of a stitch state.

FIG. 5 is a front view of a main part of a conventional tire molding apparatus.

FIG. 6 is a side view of a main part of a conventional tire molding apparatus.

[Explanation of symbols]

 Reference Signs List 1 drum 2a first roller 3a second roller 5 carcass 6 breaker 7 tread 16 auxiliary roller 17 auxiliary roller

Continuation of front page (56) References JP-A-5-293911 (JP, A) JP-A-61-106229 (JP, A) JP-A-58-133471 (JP, A) JP-A-8-11237 (JP) JP-A-7-60867 (JP, A) JP-A-7-60868 (JP, A) JP-A-7-117151 (JP, A) JP-B-60-34453 (JP, B2) JP-B Sho-A 52-37515 (JP, B2) Jikken 61-34110 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29D 30/00-30/72

Claims (4)

(57) [Claims] 1. A tire forming apparatus which presses a breaker 6 and a tread 7 or the like which are fitted over an annular carcass 5 attached to a drum 1 in an inner diameter direction and tightly forms the tread 7 in an inner diameter direction. A pair of first rollers 2a, 2a expanding along the tread width direction while pressing the first tread 7 in the circumferential direction with respect to the first rollers 2a, 2a while pressing the tread 7 in the inner diameter direction. A pair of second rollers 3a, 3a expanding along the tread width direction;
While rotating with one of the second rollers 2a, 3a as a fulcrum, the tread 7 is shifted in the tread width direction and the circumferential direction with respect to the rollers 2a, 3a, and the tread 7 is pressed in the inner diameter direction while the tread 7 is in the width direction. A pair of first diverging along
Auxiliary rollers 16, 16 or a pair of second auxiliary rollers 17, 17
And a tire forming apparatus. 2. In a tire forming apparatus in which a breaker 6 and a tread 7 which are externally fitted on an annular carcass 5 attached to a drum 1 are pressed in an inner diameter direction to form a close contact, the tread 7 is pressed in an inner diameter direction. A pair of first rollers 2a, 2a expanding along the tread width direction while pressing the first tread 7 in the circumferential direction with respect to the first rollers 2a, 2a while pressing the tread 7 in the inner diameter direction. A pair of second rollers 3a, 3a expanding along the tread width direction; rotating about the first roller 2a as a fulcrum; A pair of first auxiliary rollers 16 and 16 that expands along the tread width direction while pressing the rollers in the inner diameter direction, and rotates about the second roller 3a as a fulcrum and moves in the tread width direction with respect to the rollers 3a. Outside And circumferentially displaced and tire building apparatus characterized by comprising a second auxiliary roller 17, 17 of the pair of widening along the tread width direction while pressing the tread 7 to the inside diameter direction. 3. The tire forming apparatus according to claim 1, wherein each of the auxiliary rollers slightly overlaps the corresponding first and second rollers in the tread width direction. 4. The tire forming apparatus according to claim 1, further comprising control means for independently controlling the pressing force of the first roller 2a, the second roller 3a, and the auxiliary rollers 16, 17.