JP4860111B2 - Tire manufacturing method and tire manufacturing apparatus used therefor - Google Patents

Description

  In particular, the present invention has a substantially donut-like shape as a whole when molding a green tire, and a carcass cord fed from a yarn path is extended in the meridian direction of the core on the outer surface of a core made of a rigid material. And a tire manufacturing method for forming a carcass ply by directly adhering to the outer surface thereof or indirectly through an inner liner layer or other underlayer, and a tire manufacturing apparatus suitable for use therewith It is about.

  A carcass cord fed out from a yarn path that reciprocates in the meridian direction of the core while indexing and operating a substantially donut-shaped core having an outer surface shape corresponding to the inner shape of the product tire, By extending in the meridian direction and forming a U-shaped folded portion at the folded-back portion of the reciprocating movement of the yarn path, and sticking it to the outer surface of the core over the entire circumference, in a developed plan view, The carcass ply in which the carcass cords of the core continuously extend in a zigzag shape in the circumferential direction of the core is, for example, disclosed in JP 2000-52448 A and JP 2002-127268 A according to the prior application of the applicant. Etc. are disclosed.

In adhering the carcass cord to the outer surface of the core according to such a conventional technique, the core having a donut shape as a whole is for tires having a relatively low flatness, and the carcass cord affixing area When the difference between the maximum width and the minimum width of the core side is sufficiently small, in other words, in the green tire after molding, when the difference between the maximum separation distance of the sidewall portion and the distance between the bead portions is small The carcass cord can be applied sufficiently adequately over the entire required application area on the outer surface of the core, and the carcass ply as expected can be easily configured.
JP 2000-52448 A JP 2002-127268 A

  However, with such a conventional technique, the difference between the maximum width and the minimum width of the side surface of the core in the required application area of the carcass cord, such as a core for tires with high flatness and a core for two-wheeled vehicle tires, can be obtained. When attaching a carcass cord that is fed out of a yarn path under the action of tension to a large core, the yarn path is simply reciprocated in the direction of its meridian along the cross-sectional outline of the core. Alone, as shown in the cross-sectional view of the core in FIG. 5, the carcass cord d is in particular in the transition region from the maximum width position MA of the side surface S of the core C to the minimum width portion MI of the side surface S thereof. There is a problem that a carcass ply having a required pass line cannot be formed as it is separated from the side surface S.

  In order to solve such a problem, a timing at which no tension unevenness is generated in the carcass cord d is achieved, and the separated portion from the core side surface S is pressed against the core side surface S by the operator's manual work and there. Although it is possible to stick, it has the other problem that work man-hours will increase remarkably.

  An object of the present invention is to solve such problems of the prior art, and the object of the present invention is to apply the carcass cord to the outer surface of the core based on a predetermined reciprocation of the yarn path. At the time of pasting, the distance from the core side surface, which is inevitably generated in the cord, is mechanically pressed without needing a manpower, more preferably automatically pressed against the core side surface, and pasted there. It is an object of the present invention to provide a tire manufacturing method and a tire manufacturing apparatus used therefor that can reliably and easily constitute a common carcass ply.

In the tire manufacturing method according to the present invention, the carcass cord fed out from the yarn path under the action of tension has a donut shape as a whole, and has an outer surface shape substantially corresponding to the inner shape of the product tire, and most of them are rigid. The outer surface of the core made of material extends in the meridian direction of the core and folds radially outward from the maximum width position on the side surface of the core toward the outside in the radial direction. A carcass ply is formed by sticking on the core surface in an extending posture that continuously extends in a zigzag shape in the circumferential direction, and multiple types of tire configurations such as belt material, tread rubber, side rubber, etc. on the outer surface side of this carcass ply When molding the green tire by attaching the members, the folded part of the carcass cord is pressed against the side of the core and attached to it, and the cord of the intermediate presser block The pressure part is advanced and displaced toward the side of the core, and the separation part from the core side of the carcass cord between the maximum width position on the side of the core and the turn-back position of the carcass cord is at least at one location. When the carcass cord is folded back, it is mechanically pressed to the side surface, and when the carcass cord is folded back, the linear extension portion of the carcass cord separated from the side surface of the carcass cord before the folding, Only both the linear extension portion after the folding is pressed against the core side surface, and the pressing of the carcass cord on the core side surface of the separated portion from the core side surface is applied to the core side surface of the folded portion of the carcass cord. There is to do before pressing .

Also, the tire manufacturing apparatus according to the invention is intended for use in the practice of the manufacturing method described above, in contact with the pin and the side surface of the core to support the folded portion of the carcass cord, advances against the pin Displacement of the folded-back portion holding block that includes a pressing portion that presses the folded-back portion of the carcass cord against the core side surface is disposed to face each of the core side surfaces, and the position where each of the folded-back portion pressing blocks is disposed. If, between the maximum width position of the core side, and advances displaced toward the core side, before and after one of the folded carcass cord, cord pressing portion for pressing only the core side each of the linear extending portion And at least one intermediate presser block provided therein.

In the method for manufacturing a tire according to the present invention, in addition to pressing each folded portion of the carcass cord against the core side surface and sticking to the core side surface, the separation portion from the core side surface of the carcass cord can be intermediately pressed without manual operation. By moving the cord pressing part of the block toward the side of the core and moving it to the side of the core, it is mechanically pressed to the side of the core at the required timing and stuck to it, so that the predetermined application of the carcass cord is always realized reliably. Therefore, the carcass ply as expected can be easily and quickly formed with high accuracy.

  In this method, when the separated portion of the carcass cord is pressed at a plurality of locations in the cord extending direction, the whole separated portion can be sufficiently adhered to the side surface of the core. By the way, the same sticking effect can be realized, for example, by ensuring a sufficiently large contact area of the one cord pressing portion to the carcass cord. Since it is necessary to accurately match the shape and dimensions of the pressing surface with the shape of the predetermined region on the side surface of the core, the processing cost of the tip pressing surface is increased, and the cord pressing portion is used for tires of various sizes. It becomes impossible to have versatility for each core.

  Here, the manufacturing dimensions as described above are different from those in the case where the carcass cord forms a carcass ply corresponding to each bead portion of the green tire and continuously extending from one side portion of the core to the other side portion. Each carcass cord is connected to each side portion of the core corresponding to each tire bead portion and, for example, a crown portion of the core corresponding to the buttress portion of the tire so that the carcass cord is interrupted at the center portion of the tread portion of the green tire. Of course, the present invention can also be applied to the case of forming a carcass ply having a so-called hollow structure that is folded and extended at each portion.

  In this method, the separated portion of the carcass cord is spread over the portion before and after the folding of the carcass cord by one press, in other words, the linear extending portion before the folding and the linear extension after the folding. When both sides are pressed against the side of the core, the separated portions of the carcass cord will be erased each time they are formed, so a large number of formed separated portions are pressed together and pasted together. Compared with the case of wearing, it is possible to effectively prevent a local increase in the tensile force acting on the carcass cord, thereby making the carcass cord tension sufficiently uniform in the longitudinal direction thereof and to the carcass ply. The possibility of the occurrence of distortion can be advantageously eliminated.

  And this means that the separation portion of the carcass cord is pressed prior to the pressing of the folded portion of the carcass cord, and the increase in the tension of the carcass cord accompanying the pressing of the separation portion is caused by the displacement around the folding portion. More effective when mitigated.

  Furthermore, in the device according to the present invention, the folded portion of the carcass cord generated by the change of the moving direction of the yarn path that performs reciprocating motion is supported by, for example, the pin of the folded portion pressing block whose tip is in contact with the side surface of the core. After that, the separation portion of the carcass cord that is disposed between the pressing portion of the folded-back portion pressing block, the position where the block is disposed, and the maximum width position of the side surface of the core and extending linearly. Realizing reliable adhesion of the isolated part of the carcass cord from the side of the core to the side by pressing each cord pressing part of the intermediate presser block that presses against the side of the core at the required timing. Can do.

  FIG. 1 is a partial cross-sectional front view showing an embodiment of an apparatus according to the present invention with respect to the main part thereof.

  In the figure, reference numeral 1 denotes a core made of a rigid material and forms a donut shape as a whole. In the figure, the core 1 shown in a cross section in the width direction along the meridian has a predetermined angle in the circumferential direction at every predetermined tact time. It is rotationally displaced over a range.

  Reference numeral 2 denotes each folded portion pressing block disposed to face each side surface of the core 1, and the folded portion pressing block 2 is a yarn that is reciprocated along the cross-sectional outer contour line of the core 1 in the width direction. The carcass cord (not shown) fed out from the road 3 includes a pin 4 that supports a folded portion that is generated when the movement direction of the yarn path 3 is changed in an advancing posture in which the tip abuts against the core side surface. A pressing portion that presses the folded portion of the carcass cord formed around the pin 4 against the side surface of the core based on the relative advancing displacement with respect to the pin 4 and is attached thereto, preferably an external heating type or a self-heating type The pressing part 5 is provided.

  And here, it functions to press the linearly extending portion of the carcass cord against the core side surface between the arrangement position of each folded portion pressing block 2 and the maximum width position MA of the core side surface. Then, the one intermediate presser block 6 is disposed to face the side surface of the core.

  The intermediate presser block 6 includes, for example, two guide rods 8 for guiding the forward / backward displacement of the cord pressing portion 7 as shown in FIGS. 2A and 2B in an enlarged front view and a plan view. Provided on the storage block 9 of the guide rod 8 is provided with a single cylinder 10 for controlling the forward and backward displacement of the cord pressing portion 7 and also provided with a heater 12 accommodated in a mounting plate 11 of the cord pressing portion 7. I will. The intermediate presser block 6 is attached to the machine body frame F via a bracket 13 whose adjustable elevation angle can be adjusted. For example, the intermediate presser block 6 is used in an inclined posture in which the tip end of the cord pressing portion 7 is directed somewhat downward.

  In forming the carcass ply with the apparatus as described above, first, with the rotational movement of the core 1 stopped, the yarn path 3 is moved in the meridian direction of the core 1 as shown in FIG. Then, the core 1 is moved from a position corresponding to a predetermined position on one side of the core 1 to a position corresponding to a predetermined position on the other side along the core peripheral surface. The cord d is fed out from the yarn path 3 under the action of tension, and the cord d is adhered to the side region from the crown region of the core 1 indirectly through the base layer, and then the folded portion presser. The pin 4 of the block 2 is advanced as shown in FIG. 3 (b), the tip thereof is brought into contact with the side surface of the core 1, the core 1 is indexed over a predetermined angular range, and the yarn is Road 3 and its direction of movement By conversion of the core 1 is moved toward a position corresponding to the predetermined position of the one side.

  As a result, the carcass cord d is wound around and supported around the pin 4, and a substantially U-shaped folded portion 14 is formed therein and extends. By the way, here, as shown in FIG. 5, the cord portion extending linearly across the turn-back portion 14 extends from the side surface of the core to the region between the maximum width position MI on the side surface of the core and the minimum width portion thereof. It will have a separate part.

  Therefore, thereafter, as shown in FIG. 3 (c), the cord pressing portion 7 of the intermediate presser block 6, preferably heated, is advanced and displaced, and the above-mentioned separated portion of the carcass cord d is sufficiently pressed against the side surface of the core. Then, the separation portion is securely attached to the side surface of the core, and then, the pressing portion 5 of the folded-back portion pressing block 2 is advanced and displaced with respect to the pin 4 and is wound around the pin. The folded portion 14 of the carcass cord d thus produced is pressed and stuck to the side surface of the core.

  By the way, when the cord pressing portion 7 is acted before the pressing portion 5 of the folded-back portion presser block 2 as described above, the cord pressing portion 7 is pulled out from the yarn path 3 due to an increase in cord tension due to the action of the cord pressing portion 7. Since the carcass cord d having a slightly longer length functions to alleviate the increase in tension over the front and rear portions of the cord turn-back portion 14 that has not yet been adhered, the operation of the cord pressing portion 7 is caused. The local increase in the cord tension can be effectively suppressed.

  After the cord attaching operation on the other side portion of the core 1 shown in the figure as described above, the one side portion which is the opposite side of the drawing is operated along with the operation of the yarn path 3. The cord attaching operation is performed in the same manner, and these operations are repeated over the entire circumference of the core 1 so that the carcass cord d can be reliably and efficiently attached to the core surface over the entire length without requiring manual operation. A high-accuracy carcass ply without distortion or the like can be easily formed.

  When forming the required number of carcass plies in this way, the length of the carcass ply extending inward in the radial direction is set sufficiently long, and the radially inner end portion of the carcass ply is connected to a bead core or the like. In the case of a winding part that is rolled up and extends outward in the radial direction, for example, the core side surface of the inner end part in the radial direction of the core 1 is shown in FIG. A plurality of sector plates 21 are arranged in parallel in the circumferential direction, and each sector plate 21 can be displaced by swinging the lower end portion toward the outer side of the core. And a radially inner end of each fan-shaped plate 21 is greatly oscillated and fluctuated outwardly in synchronization with each other inside the side surface of the core thus configured. After forming the required carcass ply with the core structure accommodating the bladder 23, each fan-shaped plate 21 is greatly expanded and displaced outward as shown in FIG. 4 (b) based on the full deformation of the bladder 23. In accordance with this expansion displacement, the inner end portion in the radial direction of the carcass ply is wound back around the bead core 24, so that the winding portion as expected as in the conventional general tire can be obtained with a simple core structure. Therefore, the carcass ply can be sufficiently formed with high pull-out durability.

It is a fragmentary sectional front view which shows embodiment of the apparatus which concerns on this invention about the principal part. It is the expansion front view and top view of an intermediate | middle presser block. It is an approximate line process figure showing an embodiment of a method concerning this invention. It is a principal part schematic sectional drawing which illustrates the formation aspect of the winding part of a carcass ply. It is a figure which illustrates the pass line of a carcass cord by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core 2 Folding part pressing block 3 Yarn path 4 Pin 5 Pressing part 6 Intermediate pressing block 7 Cord pressing part 8 Guide rod 9 Storage block 10 Cylinder 11 Mounting plate 12 Heater 13 Bracket 14 Folding part 21 Fan-shaped plate 22 Stopper 23 Bladder 24 Bead core MA Maximum width position F Frame d Carcass cord

Claims (2)

The carcass cord extends in the meridian direction of the core on the outer surface of the core having a donut shape as a whole, and is folded back toward the outer side in the radial direction from the maximum width position of the side surface of the core. A carcass ply is formed by sticking on the core surface in an extending posture that continuously extends in a zigzag shape in the circumferential direction of the core in a developed plan view, and a plurality of types of tire components are pasted on the outer surface side of the carcass ply. A tire manufacturing method in which a green tire is molded by wearing,
The folded part of the carcass cord is pressed against the side of the core and stuck to it, and the cord pressing part of the intermediate presser block is moved forward and displaced toward the side of the core, and the maximum width position of the side of the core and the folded back of the carcass cord between the position, the separation portion from the core side of the carcass cord, at least one place, hits the Ru is adhered mechanically pressed against the core side,
When the carcass cord is folded back, only one part of the carcass cord separated from the side surface of the carcass cord is separated from the side surface of the carcass cord by the linear extension portion before the folding and the linear portion after the folding. A method for manufacturing a tire which presses a side surface and presses a carcass cord on a core side surface at a distance from a core side prior to pressing a carcass cord folded portion on a core side surface . It is an apparatus used for the manufacturing method of the tire according to claim 1,
A pin that supports the folded portion of the carcass cord and contacts the side surface of the core, and a folded portion holding block that includes a pressing portion that moves forward relative to the pin and presses the folded portion of the carcass cord against the core side surface. It is arranged to face the core side surface, and is moved forward and displaced toward the core side surface between the arrangement position of each folded portion presser block and the maximum width position of the core side surface. A tire manufacturing apparatus provided with at least one intermediate pressing block including a cord pressing portion that presses only the linearly extending portions of the core before and after the folding.

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