JP2003291225A - Method and apparatus for sticking ply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ply sticking method for manufacturing a carcass excellent in productivity by a simple process, without needing a large space, an apparatus, etc., with the uniformity of a cord arrangement distribution improved, and without a decrease in the adhesiveness of a coated rubber surface. <P>SOLUTION: On the outer surface 2DO of a transfer drum 2D, a plurality of plys PP1, PP2, etc., in the shape of a rectangle having longer sides in the length direction of cords in the rectangular plies and shorter sides in the width direction of the cords are manufactured, and the ply sheet PPS is manufactured with the mutual length directions of PPN made an adjacent joint. Adjoining the transfer drum 2D, an inner liner IL is transferred to a tire molding drum 1D by rotating it reversely to the transfer drum 2D while the inner liner IL is mounted on the tire molding drum 1D with the inner liner IL stuck in advance on the outer surface of the tire molding drum 1D. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for applying a ply (carcass ply) for forming a carcass, which is a member of a tire, and particularly to a ply application that can be suitably used in a continuous tire manufacturing process. The present invention relates to a mounting method and device.

[0002]

2. Description of the Related Art Conventionally, a carcass of a pneumatic radial tire member has been manufactured by the following method. First of all, a large number of cords are arranged at substantially equal intervals in parallel with the material, strength, and density according to the type and size of the product tire, and then the large number of adhesive-treated cords are arranged along the cord length direction. After coating the unvulcanized rubber with a calendering device to a predetermined thickness, it is wound on a liner cloth for storing the raw material for storing the calendered raw material.
Then, the roll is conveyed to a cutting device, the original fabric is taken out from the roll, and a cut piece cut in a direction orthogonal to the cord length direction with a ply width according to the product tire type and size is used in the cord length direction. The original plysheet fabric is made by jointing together and wound up and stored on a liner cloth for storing plysheet fabric. Next, the roll is conveyed to a tire forming drum, a ply sheet is taken out from the roll, and the ply sheet is attached to the tire forming drum. A predetermined ply sheet length according to the tire type and size is provided along the cord length direction. The carcass was created by cutting and joining both ends.

[0003]

However, in the above-mentioned conventional manufacturing method, a calendering process requiring a large space and a device, a liner cloth for storing a raw material for storing a calendered raw material, a ply sheet raw material storing A liner cloth for use, a space for storing the above scroll, etc. were required.

Further, in the above-mentioned manufacturing method, when the carcass is made, the calendered raw fabric and ply sheet raw fabric coated with unvulcanized rubber are wound around the storage liner cloth or taken out from the storage liner cloth. Or a step for transporting the roll, and during this step, the uniformity of the arrangement distribution of the cords in the calendered raw material and the ply sheet raw material may decrease. It was Furthermore, when the storage period of the calendered raw fabric and the ply sheet raw fabric becomes long, the adhesiveness of the coated rubber surface decreases during storage, and it becomes difficult to bond it to a member adjacent to the surface of the coated rubber. Occasionally, the original fabric and the original plysheet fabric were discarded. as a result,
There was room for improvement in terms of productivity and quality of the obtained carcass.

The object of the present invention is to store a calendering process requiring a large space and a device, a liner cloth for storing a raw material for storing a calendered raw material, a liner cloth for storing a ply sheet raw material, and the above scroll. Space is not needed, the distribution of the cords in the ply sheet is uniform, and the adhesiveness of the coated rubber surface does not decrease, creating a carcass with excellent productivity. To provide a device.

[0006]

As a result of extensive studies to achieve the above object, the present invention is
A ply attaching method is adopted, which is characterized in that a plurality of strip-shaped plies are jointed to form a ply sheet, and the ply sheet is transferred from the transfer drum to a tire forming drum to form a carcass.

Since the present invention is as described above, when transferring a strip-shaped ply to a tire forming drum, usually, the ply sheet held on the outer peripheral surface of the transfer drum is formed on the tire forming drum adjacent to the transfer drum. It can be transferred to the tire forming drum by being rotated in the opposite direction to the transfer drum while being hung on the drum.

At this time, the strip-shaped plies to be supplied first are held on the outer peripheral surface of the transfer drum, the subsequent strip-shaped plies are sequentially jointed, and the rear end of the strip-shaped plies supplied last is held. Then, the ply sheet can be transferred to the tire forming drum while releasing the holding of the ply sheet from the tip portion of the ply sheet.

Further, when the ply sheet is transferred to the tire building drum, the ply sheet can be held on the transfer drum by the adhesive force of the rubber of the ply sheet, and the ply sheet is transferred to the tire building drum in accordance with the holding. It can also be transcribed.

Further, the frontmost strip-shaped ply is held by the front end holder at the front end of the ply sheet provided on the transfer drum, and then the next strip-shaped ply is attached to the frontmost strip-shaped ply in the width direction. Butt and joint, and then successively repeat a plurality of strip-shaped plies in the same manner, and hold the last strip-shaped ply in the rear-end holder of the ply sheet rear end portion. It is desirable to transfer from the tip portion of the ply sheet held by the above to the tire forming drum while releasing the holding of the ply sheet.

In addition, although not limited, a plurality of strip-shaped plies are joined to the outer peripheral surface of a transfer drum having a diameter larger than that of the tire forming drum to form a ply sheet. Is desirable. By making the diameter of the transfer drum larger than the diameter of the tire forming drum, the pressure applied to the joint surface at the time of joint increases, and the joint of the strip-shaped plies forming the ply sheet can be smoothly joined. As a result, the distribution of cords in the carcass becomes more stable.

When transferring the ply sheet,
An inner liner, which is the innermost layer of the tire carcass, may be previously arranged on the outer peripheral surface of the tire forming drum, and the ply sheet may be transferred onto the inner liner. Further, the strip-shaped ply has a Z-shaped cross-section as shown in FIG.
It is desirable to use a strip-shaped ply having a Z-shaped cross section as shown in (b). As a result, as will be described later,
Since the strip-shaped plies can be jointed smoothly, the uniformity of the distribution of the cords in the ply sheet is improved.

The preferred ply attachment device according to the present invention includes a molding device having a tire molding drum, a transfer device having a transfer drum for transferring a ply sheet to the tire molding drum, and a strip for the transfer drum. At least a transfer device for transferring the strip-shaped plies is arranged, and the transfer drum is provided with a front-end holder and a last strip of the ply sheet for attaching and holding the first strip-shaped ply supplied from the transport device. A rear end holder for attaching and holding the strip-shaped ply is provided, and the transfer device is provided with a joining device for sequentially abutting the strip-shaped plies in the width direction and joining them. This is a ply attachment device.

When the strip-shaped plies are abutted and joined together on the outer peripheral surface of the transfer drum, the joining device has a pressing portion for pressing the outside of the joint surface, and contacts the outside of the joint surface of the pressing portion. A flat surface is desirable.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view of a ply attaching apparatus according to the present invention, and FIG. 2 is a schematic cross-sectional view showing a method for attaching a ply according to the present invention using the attaching apparatus of FIG.

In the figure, 1 is a molding device, 1D is a tire molding drum, 2 is a transfer device, 2D is a transfer drum, 22 is a front end holder for the front end of the ply sheet, and 23 is a rear end holder for the rear end of the ply sheet. Reference numeral 3 is a transfer device, 31 is an arm portion of the transfer device, PP1 and PP2 are strip plies, C is a code in the strip plies, and JM is the strip plies butted against the outer peripheral surface of the transfer drum to join them. It is a joining device at the time.

A method of attaching the ply of the present invention will be described below with reference to FIGS. 1 and 2. First, the first strip-shaped ply PP1 of the strip-shaped ply PP shown in FIG. 2 (a) created in the previous step (not shown) is held by the arm portion 31 of the transfer device 3 and then, as shown in FIG. As shown in FIG. 5, after transferring the cord in the strip-shaped ply to the top portion 211 of the outer peripheral surface 2DO of the transfer drum 2D such that the rotation axis (not shown) of the transfer drum 2D is parallel, the holding is released to release the top portion. Paste it to 211.
As shown in FIGS. 2A and 2B, the strip-shaped ply P
P includes a plurality of cords C and unvulcanized rubber G, and the plurality of cords C are arranged in parallel at the same intervals and covered with the unvulcanized rubber G. The first strip-shaped ply PP1 which is the earliest strip-shaped ply is attached to the outer peripheral surface 2DO of the transfer drum 2D.
When attaching to the top part 211 of the strip-shaped ply tip part PP
11 is held by a tip holder 22. As shown in an example in FIG. 2E, the holder 22 is arranged on the inner surface of the transfer drum 2D, has suction means such as vacuum, and transfers the transfer drum 2D to suck the ply sheet front end portion PP11. A plurality of suction holes (not shown) are arranged on the top. The portion other than the tip PP11 of the strip ply PP1 is held on the transfer drum by the adhesive force of the unvulcanized rubber G.

Then, the transfer drum is rotated to rotate the transfer drum as shown in FIG.
As shown in FIG. 2, the rear end portion PP12 of the strip-shaped ply PP1 is positioned so as to come to the top portion 212 of the outer peripheral surface 2DO of the transfer drum 2D, and subsequently, as shown in FIG. The next strip-shaped ply PP2 is placed adjacent to the strip-shaped ply PP1 on the PP1 by the transfer device 3 in the same manner as the strip-shaped ply PP1 and then abutted and joined together in the width direction. The strip ply PP1 and the next strip ply PP2 are arranged in the width direction on the strip ply PP.
When the rear end portion PP12 of the strip-shaped ply PP1 and the tip portion PP21 of the strip-shaped ply PP2 are butted and joined together, a joining device JM is usually used as shown in FIG. 2 (c). It is desirable to have a pressing portion P that presses the outside of the joint surface, and that the surface PF of the pressing portion P that contacts the outside of the joint surface be flat. This makes it more uniform after jointing than when it is not flat, as shown in the coding arrangement in the plies in Figure 2 (d).

Subsequently, as shown in FIG. 2 (h), the transfer drum 2D is rotated to move the rear end portion PP2 of the strip-shaped ply PP2.
2 to the top portion 213 of the outer peripheral surface 2DO of the transfer drum 2D, and subsequently, as shown in FIG. 2 (i), the second strip ply PP3 is transferred to the second strip ply PP2 by the transfer device 3. Arranged adjacent to the strip ply PP2,
The joining device JM makes a joint by abutting on the width direction side. When the strip-shaped ply PP2 and the next third strip-shaped ply PP3 are butted and joined together in the width direction, the joining method is the same as the method of joining the strip-shaped ply PP1 and the strip-shaped ply PP2.

Thereafter, a plurality of strip-shaped plies PP4,
, PPN are joined by the same method, and the last N-th strip ply PPN is held by the rear end holder 23 of the ply sheet rear end portion PPN2 as shown in FIG. 2 (j). In addition, the strip-shaped ply PPN is attached to the rear end portion PPN2 of the ply sheet.
For holding when the trailing edge holder 23 holds the trailing edge holder 23, the same holder as the leading edge holder at the leading end of the ply sheet can be applied. The leading edge holder 22 and the trailing edge holder 23 are arranged at a plurality of positions in the width direction of the transfer drum 2D, and the leading edge PP11 of the first strip-shaped ply PP1 and the last strip-shaped ply PPN are arranged.
The rear end PPN2 and the rear end PPN2 are held on the outer peripheral surface 2DO of the transfer drum 2D.
If the rubber G covering the rear end PPN2 of the last strip-shaped ply PPN can be held only by the adhesive force, it is not necessary to use the front end holder 22 and the rear end holder 23.
The portions other than the front end PP11 of the first strip-shaped ply PP1 and the rear end PPN2 of the last strip-shaped ply PPN are held only by the adhesive force of the rubber G covering the strip-shaped ply. When the adhesive force of the rubber G is weak, one or a plurality of similar holders are arranged between the front end holder 22 and the rear end holder 23 on the transfer drum 2D, and the strip is provided at a position other than the front end and the rear end. Ply P
It is also possible to hold P. In addition, strip ply P
The width of P1, PP2, ..., PPN is a width obtained by dividing the length of the ply sheet PPS forming the carcass into N equal parts.
(A) and the strip-shaped plies PP1 and PP2 shown in FIG. 2 (b)
Is indicated by W. 2 (e) to 2 (j), the rear end holder 23 is arranged at one position in the drum circumferential direction of the transfer drum 2D, but its position is changed depending on the length of the ply sheet PPS. A mechanism (not shown) that slides in the circumferential direction of the transfer drum 2D may be adopted and moved. Further, the rear end holders 23 are arranged at two or more locations in the drum circumferential direction of the transfer drum 2D, and the ply sheet P
Either can be used depending on the length of PS.

As described above, the transfer drum 2D shown in FIG.
A method of transferring the ply sheet PPS held on the outer peripheral surface 2DO of the above to the tire forming drum adjacent to the transfer drum 2D will be described with reference to FIG. FIG. 3 illustrates a situation in which the ply sheet PPS held on the outer peripheral surface 2DO of the transfer drum 2D is transferred to the tire forming drum by the reverse rotation of the transfer drum 2D while being stretched over the tire forming drum 1D adjacent to the transfer drum 2D. FIG.
In FIG. 3, 1D is a tire forming drum, 2D is a transfer drum, 22 is a front end holder for the front end of the ply sheet, 23 is a rear end holder for the rear end of the ply sheet, PPS is a ply sheet, and IL is an inner liner. . The rotation shaft (not shown) of the tire forming drum 1D and the rotation shaft (not shown) of the transfer drum 2D are parallel and arranged at the same height.

First, the transfer drum 2D shown in FIG. 3 (a).
Ply sheet PPS held by the rear end holder 23 of
As shown in FIG. 3B, the rear end portion PPN2 is rotated in parallel with the rotation shaft (not shown) of the transfer drum 2D and is moved in parallel to the rotation shaft (not shown) of the tire molding drum 1D. The rear end portion PPN2 of the ply sheet PPS is adjacent to the inner liner IL attached to the outer peripheral surface of the tire forming drum 1D in advance, and the rear end portion PPN2 is formed by the cylinder (not shown) of the rear end holder 23. Crimp on. Next, as shown in FIG. 3C, the holding of the rear end holder 23 of the ply sheet rear end portion PPN2 is released, and the ply sheet PPS is rotated while rotating the transfer drum 2D and the tire molding drum 1D in the arrow direction. Transfer to the tire forming drum 1D. FIG. 3D is a view showing a state in which the ply sheet PPS is completely transferred from the transfer drum 2D to the tire forming drum 1D, and the strip-shaped ply P immediately before the complete transfer.
The tip portion PP11 is pressure-bonded to the molding drum 1D by a cylinder (not shown) of the tip holding tool 22 of P1, and after releasing the holding, the ply sheet tip portion PP11 is removed from the transfer drum 2D. Of course, it is also possible to start the transfer from the front end portion PP11 to the molding drum 1D and end the transfer at the rear end portion PPN2. After the transfer from the transfer drum 2D to the tire forming drum 1D is completed, the ply sheet P in the carcass
Tip PP1 of the first strip-shaped ply PP1 forming PS
The joint between 1 and the rear end PPN2 of the last strip-shaped ply PPN forming the ply sheet PPS is connected in the same manner as the joint method between the strip-shaped plies of the transfer drum. After the transfer is completed, the transfer drum 2D is moved back to the original position. In FIG. 3, the inner liner I
Although L is attached to the outer peripheral surface of the tire forming drum 1D in advance, the innermost carcass layer is used in the case of a tire having a single carcass and a carcass having a plurality of carcasses. When making, inner liner I
A ply sheet P in which L is not attached to the outer peripheral surface of the tire forming drum 1D but is attached to the outer peripheral surface 2DO of the transfer drum 2D.
It is also possible to attach the inner liner on PS (not shown) and then transfer it to the tire forming drum 1D. The peripheral length of the forming drum 1D and the integral multiple of the strip width W of the strip ply PP do not necessarily match. for that reason,
During transfer, a speed difference occurs between the transfer drum 2D and the molding drum 1D. In this case, the speed difference can be eliminated by bringing the transfer drum 2D and the molding drum 1D close to each other so as to have a gap and performing the transfer with a margin in the ply sheet PPS.

In the present invention, the distribution of the cords in the strip-shaped ply is usually a distribution according to the type and size of the product tire, and the length of the cords in the strip-shaped ply (the width of the carcass) is The dimensions are based on the type and size of the product tire. Therefore, compared to the method described in the prior art,
A carcass can be created by simply changing the dimensions of the strip-shaped plies according to the type and size of the product tire.
Low-volume production of other products is possible.

The die used for the extrusion molding is
It is desirable to use a die K having a Z-shaped schematic cross section as shown in FIG. 4 (a). When a die having a Z-shaped cross section is used for the die K, a strip-shaped ply PP having a cross section as shown in FIG. 4B is obtained. In FIG. 4, reference numeral C indicates a code in the strip ply PP. FIG. 4 (c) is a schematic view showing a situation in which the strip plies PP are joined together along the cord C in the strip plies PP, and the joining device JM is pushed out by the Z-shaped mouthpiece PP. Hold down the PPE part of the beard. As a result, as shown in the schematic cross-sectional view showing the cord density arrangement distribution in the ply sheet of FIG. 4 (d), the arrangement of the cords C in the rubber G in the vicinity of the joint is not disturbed, and the obtained ply sheet is The distribution of coding sequences in is stable.

[0025]

As described in detail above, according to the present invention, a calendering process requiring a large space and a device, a liner cloth for storing an original fabric for storing a calendered original fabric, and a ply sheet original fabric Storage liner cloth, does not require space to store the above scrolls,
The distribution of the code sequences in the ply sheet is good, and the adhesion of the surface of the coated rubber is not reduced, and the ply can be attached to form a carcass with excellent productivity.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a ply attaching apparatus according to the present invention.

2 (a) to (j) use the pasting device of FIG.
It is a schematic sectional drawing which shows the method of sticking the ply which concerns on this invention.

FIG. 3A to FIG. 3D are states in which the ply sheet PPS held on the outer peripheral surface of the transfer drum is transferred to the tire forming drum by being rotated in the reverse rotation of the transfer drum while being stretched over the tire forming drum adjacent to the transfer drum. It is a schematic cross-sectional view illustrating.

FIG. 4 (a) is a schematic view of a die used for extrusion molding the strip-shaped ply according to the present invention. (B) It is the schematic of the cross section of the strip-shaped ply extrusion-molded using the die shown in FIG. (C) A schematic view for explaining a situation in which strip-shaped plies are jointed along a cord in the strip-shaped plies. (D) A schematic cross-sectional view showing the distribution of code sequences in the ply sheet.

[Explanation of symbols]

1 molding equipment 1D tire building drum 2 Transfer device 2D transfer drum 22 Tip holder for tip of ply sheet 23 Rear end retainer for rear end of ply sheet 3 Transfer device 31 Transfer device arm PP1 Strip ply PP2 Strip ply C Code in strip ply G Rubber in strip ply JM joining device PPS ply sheet

Claims (10)

[Claims] 1. A carcass is produced by forming a ply sheet by jointing a plurality of strip-shaped plies on the outer peripheral surface of a transfer drum and transferring the ply sheet from the transfer drum to a tire forming drum. How to attach the ply. 2. The ply sheet held on the outer peripheral surface of the transfer drum is transferred to the tire forming drum by being rotated in the reverse direction of the transfer drum while being stretched over the tire forming drum adjacent to the transfer drum. How to attach plies. 3. The subsequent strip-shaped plies are sequentially jointed while the strip-shaped plies supplied first are held on the outer peripheral surface of the transfer drum, and the rear end of the strip-shaped plies supplied last is held. The ply attaching method according to claim 1 or 2, wherein the ply sheet is transferred to the tire forming drum while releasing the holding of the ply sheet from the tip portion of the ply sheet. 4. The ply according to claim 1, wherein the ply sheet is transferred to the tire forming drum while the ply sheet is held on the transfer drum by the adhesive force of the rubber of the ply sheet. How to paste. 5. The frontmost strip-shaped ply is held by a tip holder on the front end of the ply sheet provided on the transfer drum, and then the next strip-shaped ply is attached to the frontmost strip-shaped ply in the width direction. Butt and joint, and then successively repeat a plurality of strip-shaped plies in the same manner, and hold the last strip-shaped ply in the rear-end holder of the ply sheet rear end portion. The ply attaching method according to any one of claims 1 to 4, wherein the ply sheet is transferred from the front end portion of the ply sheet held on the tire forming drum while releasing the holding of the ply sheet. 6. The ply sticking according to claim 1, wherein a plurality of strip-shaped plies are joined to the outer peripheral surface of a transfer drum having a diameter larger than that of the tire forming drum to form a ply sheet. How to attach. 7. The ply attaching method according to claim 1, wherein the ply sheet is transferred to an inner liner layer arranged on the outer peripheral surface of the tire forming drum. 8. A molding apparatus including a tire molding drum,
At least a transfer device having a transfer drum for transferring a ply sheet to the tire forming drum and a transfer device for transferring the strip-shaped plies to the transfer drum are arranged, and the transfer drum is supplied from the transfer device. And a trailing edge holder for attaching and holding the last strip-shaped ply, and a trailing edge holder for attaching and holding the last strip-shaped ply. The ply attaching device is provided with a joining device for sequentially abutting and joining strip-shaped plies on the width direction side. 9. The joining device has a pressing portion that presses the outside of the joint surface when the strip-shaped plies are abutted against each other on the outer peripheral surface of the transfer drum and jointed, and the outside of the joint surface of the pressing portion. The ply attaching device according to claim 8, wherein a surface in contact with the ply is flat. 10. The ply attaching method according to claim 1, wherein the strip ply is a strip ply having a Z-shaped cross section.