JP2005199459A - Tire manufacturing method and tire manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible not only to select the extension mode of belt cords in a product tire but also to remove the cut ends of the belt cords from the side edge of a belt layer. <P>SOLUTION: In extending belt cords (d) over the range between one side part of the crown region 4 of a core 1 having the outer surface shape corresponding to the inner surface shape of the tire and the other side part thereof and bonding them to the whole periphery of the core 1 to form the belt layer, the belt cords (d) are delivered from a thread guide 5 while reciprocating the thread guide 5 in the center axial line direction of the core 1 and the revolving motion of the core 1 around the center axial direction thereof is controlled corresponding to the movement of the thread guide 5 to bond the belt cords (d) to the core 1. The folding-back part of the belt cords is formed to the periphery of the pin 9 brought into contact with the surface of the core by converting the moving direction of the thread guide 5 to be pressed to the surface of the core and the belt cords are bonded to the surface of the core to form the belt layer. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the green tire molding process, one or a plurality of belt layers are completely separated from other tire component forming processes and formed independently, and a part of a series of tire molding processes. The present invention relates to a tire manufacturing method that can be used in any of the above cases, and a tire manufacturing apparatus that is suitable for use in the tire manufacturing method, and in particular, an extension mode of a belt cord in a tread portion of a product tire. It can be selected as required.

  When forming a belt layer in a series of green tire molding processes, a large number of linear belt cords arranged in parallel with each other in the coated rubber are placed on the tire components formed in advance on the molding drum. An axial direction of the belt cord wound in a cylindrical shape, with the belt cord wound in a cylindrical shape based on the bulging deformation of the carcass band formed in advance with the angle of extension of each belt cord with respect to the circumferential direction being a predetermined angle. The center portion of the belt is expanded and deformed, and both end portions thereof are deformed and deformed by a stitching roll or the like, and the belt cord is sufficiently adhered to the tire constituent portion on the inner layer side to obtain the required belt layer. It is common to do.

  In addition, when forming a cylindrical belt band independent of a series of tire molding processes, a rubber-coated belt cord is formed in a cylindrical shape on a band drum to form a belt band. Positioned and arranged on the outer peripheral side of the formed carcass band, in the same manner as described above, the carcass band is expanded and the central portion of the belt band is expanded and deformed, and both end portions thereof are deformed and deformed. In general, a belt band is formed by attaching a belt band to an inner layer portion.

  However, in any of these prior arts, as shown in a schematic development plan view in FIG. 9A, the coating rubber 51 is arranged and arranged, for example, with respect to the width center line CL. Each belt cord 52 extending at a predetermined angle in the direction is once formed into a cylindrical belt band or the like, and then, as shown in FIG. Since the belt layer 53 is formed in a state in which the portion is reduced in diameter, the belt cord 52 in the belt layer 53 is subjected to the action of the inter-cord covering rubber 51, and the tread center having a large amount of diameter expansion deformation as viewed from the product tire. On the belt side, the belt cord angle with respect to the circumferential direction is likely to be smaller and the belt cord spacing is likely to be wider than the tread end portion where the amount of deformation is large. tire As enlarged diameter volume and diameter reduction had become particularly large in the case where both increased.

  Moreover, in the belt layer 53 formed in this way, the cut ends of the belt cords 52 are present on both side edges thereof, so that stress tends to concentrate on the side edges of the belt layer in the product tire, and from there. There was another problem that belt cord separation was likely to occur.

  The present invention has been made in view of the above points, and the object of the invention is, of course, to make the extension state of the belt cord in the product tire the same as described in the prior art. A method for manufacturing a tire that can be appropriately selected as required, and that can remove the cord cut end from the side edge of the belt layer, in particular, a method for forming the belt layer, and a tire manufacturing apparatus suitable for use in the method. To provide.

  The tire manufacturing method according to the present invention includes a belt cord made of an organic fiber material, which has a donut shape as a whole, and has an outer surface shape corresponding to the inner surface shape of the tire. The belt layer is formed by extending between one side and the other side of the core and pasting the entire circumference of the core, and a belt layer forming station is formed on the outer peripheral side of the belt layer. At the same work station or another work station, when forming one or more types of tire components and molding a green tire, the yarn path is moved back and forth in the direction of the central axis of the core. The carcass cord is usually fed from the yarn path under the action of a tensile force, and the rotational movement of the core around the central axis is controlled in accordance with the movement of the yarn path. The belt cord is rolled and adhered to the core surface, and the pin contacted with the core surface is changed by changing the direction of movement of the yarn path on one side and the other side of the crown region. A belt cord folded portion is formed around the belt cord, and the folded portion is pressed against and adhered to the core surface to form a belt layer.

  Here, the belt cord can be attached to the core surface by either a cord with rubber or a cord without rubber, and the cord can be attached to the core surface by other pre-formed on the core. In addition to indirectly through the tire component, the squeegee rubber layer and other underlayers, it can also be performed directly.

  Preferably, in this method, the control of the rotational movement of the core corresponding to the movement of the yarn path is used as the rotational speed control, and the extension angle of the belt cord with respect to the circumferential direction of the core, usually combined with this. Adjust the code spacing.

  Such movement control is performed by changing the rotation direction between the movement of the yarn path from one side of the crown region to the other side and the movement from the other side to one side. The cores will be indexed in the same direction over a predetermined angular range during their pivoting movements.

  Further, the tire manufacturing apparatus according to the present invention has a donut shape as a whole, an outer surface shape corresponding to the inner surface shape of the tire, and a core that rotates around the central axis, A yarn path disposed close to the crown area, such as facing the crown area, can be reciprocated in the direction of the central axis of the core, and a pin that directly or indirectly abuts the core surface on each side of the crown area. The folded portion pressing block is provided that includes a pressing portion that moves forward relative to the pin and presses the folded portion of the belt cord against the core surface.

  Here, preferably, the folded-back portion pressing block is displaceable in a direction orthogonal to the central axis of the core.

  In the method according to the present invention, for example, the yarn path located opposite to the crown region of the core is subjected to forward and backward displacements with or without speed control, and the core is under control as required. For example, by rotating and displacing at a speed selected in advance according to the coordinate position of the yarn path, the belt cord extending between both sides of the crown area can be changed regardless of the curvature radius of the crown area. As a result, the belt layer of the product tire can sufficiently exhibit the required mode.

  Also, here, one or a plurality of belt cords made of an organic fiber material are folded and extended in a substantially U shape at each side portion of the crown region, so that the belt can be extended from the side edge of the belt layer. Since the cut end of the cord can be removed and the concentration of stress on the belt side edge in the product tire can be effectively prevented, the occurrence of separation of the belt cord therefrom can be effectively prevented.

  Here, when controlling the rotational movement of the core as a speed control including stopping of the rotation, the angle of the belt cord with respect to the circumferential direction of the core is a cord corresponding to the position in the central axis direction of the core. It can be easily adjusted together with the interval.

  By the way, in the apparatus according to the present invention, for example, the yarn path is moved forward and backward at a predetermined speed or the speed is changed between one side and the other side of the crown region of the core. While moving forward and backward, letting the belt cord out from the yarn path under the action of the required tension, and controlling the rotational movement of the core corresponding to each of these movements of the yarn path, The belt cord extending and sticking mode between the respective side portions of the crown region can be appropriately selected as required, and can always be as intended.

  In addition, here, the folded portion of the belt cord formed around the pin at each side portion of the crown region of the core is pressed against the core surface with the pressing portion of the folded portion pressing block, and is adhered thereto. The entire belt layer can be sufficiently adhered directly or indirectly on the core surface.

  In this device, when the pair of folded portion pressing blocks can be displaced in the direction perpendicular to the central axis of the core, for example, when a plurality of belt layers are laminated, the belt cord is placed between the layers. Even when extending in the opposite direction with respect to the equatorial plane of the core, it is possible to cope with it only by changing the position of the pair of folded-back portion pressing blocks, so that the equipment cost can be advantageously reduced.

FIG. 1 is a schematic perspective view showing an embodiment of an apparatus according to the present invention.
In the figure, reference numeral 1 denotes a core made of a rigid material having a donut shape as a whole and having an outer surface shape corresponding to the inner surface shape of the tire. The core 1 is a drive shaft 3 connected to a motor 2 such as a servo motor. In addition to being detachably mounted on the center axis, it is rotated and displaced in a required direction in a desired manner under the movement control by the motor 2, and at a predetermined angle range at a predetermined timing. Indexed over.

  Here, the core 1 can be divided into a plurality of segments for removal from a product tire formed by vulcanization molding of a molded green tire or from one or more formed belt layers. it can.

  Also, here, close to the crown region 4 of the core 1, for example, one thread path 5 is supported and arranged by an articulated robot 6 in the figure, and this thread path 5 is arranged for the action of the robot 6. Below, the reciprocating motion is enabled in the direction of the center axis of the core 1, for example, over the entire width of the crown region 4, preferably along the outer surface of the core 1, at a required speed including a change in speed.

  Further, the folded portion pressing block 7 is disposed on each side portion of the crown region 4 of the core 1 so as to be supported by the frame 8, and the pins 9 that are in contact with the core surface are provided on each pressing block 7, and Each of the pressing portions 10 that are advanced and displaced with respect to the pin 9 and press the folded portion of the belt cord against the core surface is provided.

  Here, the required displacement of each of the pin 9 and the pressing portion 10 is, for example, as shown in FIG. 2 in a schematic cross-sectional plan view, by which the pin 9 is spring-biased in the advancing direction inside the pressing portion 10. And the pressing portion itself can be accommodated in the cylinder block 11 and the pressing portion 10 can be moved forward and backward as required. In this case, the pressing portion 10 advances. The force is set to be larger than the spring force of the spring that biases the pin 9.

  According to this, the distal end of the pin 9 accommodated therein can be brought into contact with the core surface with a required force by moving the pressing portion 10 to the intermediate position with respect to the cylinder block 11, and Further, the pressing portion 10 is further advanced and displaced, thereby causing the pressing portion 10 to relatively advance with respect to the pin 9 so that the tip surface of the pressing portion 10 can be brought into contact with the core surface with a required force. On the other hand, when the pressing portion 10 is displaced to the retreat limit position, the tip of the pin 9 can be sufficiently separated from the core surface.

  Each folded portion presser block 7 that can be configured as described above is preferably displaceable in the direction perpendicular to the central axis of the core 1. For this purpose, for example, FIG. As shown in the enlarged schematic perspective view of FIG. 1, a rail 12 extending horizontally in a direction perpendicular to the central axis of the core 1 is laid on the frame 8, and the cylinder block 11 is mounted on a slider 13 that engages with the rail 12. It is preferable to provide clamping means 14 that is attached directly or indirectly and that positions and fixes the slider 13 at a required position in the extending direction of the rail 12.

  According to this, each clamp means 14 is operated to displace and position the slider 13 to a required position on the rail 12, so that the pin 9 attached to the cylinder block 11 can be moved to the crown region 4 of the core 1. The belt cord can be easily positioned at a position that accurately corresponds to the required extension of the belt cord.

  Also, here, as illustrated in a schematic plan view in FIG. 4, the belt cord d for forming the lower belt layer is applied to the crown region 4 of the core 1 in a pressure-lowering form as shown in the figure. In order to extend the belt cord d of the upper belt layer in the upward direction in the drawing after being stuck to form a belt layer, each folded portion presser block 7 that forms a pair with the core 1 interposed therebetween. Can be adequately dealt with by displacing the rails along the rails 12 to the positions indicated by the phantom lines in the figure, which is advantageous in terms of equipment cost compared to the case where a plurality of pairs of folded-back portion holding blocks 7 are installed in advance. Can be reduced.

For example, when forming a belt layer as a part of the green tire molding process using the apparatus as described above, a predetermined tire component is formed on the outer surface of the core 1 in advance, and then the robot 6 Based on the above operation, the yarn path 5 is moved forward and backward in the direction of the central axis of the core 1, and at least one belt cord d made of an organic fiber material is fed therefrom under the action of a predetermined tension. The core 1 is caused to correspond to each of the movements of the yarn path 5 and perform a rotational movement controlled according to the required extending form of the belt cord d around its central axis. The belt cord d extends between the one side portion and the other side portion of the crown region 4 of the core 1 and is attached thereto.
In this case, the core 1 moves in a fixed direction separately from the above-described controlled rotational movement between the forward movement and the backward movement of the yarn path 5 and between the backward movement and the backward movement. Therefore, the indexing operation is performed over a certain angular range, and the controlled rotational movement of the core 1 is performed in opposite directions before and after the indexing operation.

  By the way, the movement direction of the reciprocating motion of the yarn path 5 is, for example, the end of the forward movement of the yarn path 5, the contact of the pin 9 of the folded-back portion holding block 7 with the core surface, and one indexing operation of the core 1 And the start of the backward movement of the yarn path 5 can be converted sequentially, and these are the same in the conversion from the backward movement to the forward movement.

  When the direction of movement of the yarn path 5 is converted in this way, the perspective view is illustrated in FIG. 5A around the pin 9 abutted against the core surface for each conversion. Thus, the folded portion 15 of the belt cord d is formed, and the folded portion 15 formed in this way is usually located away from the core surface. As shown in FIG. 5 (b), the portion 10 is advanced and displaced, and the folded portion 15 around the pin 9 is pressed against the surface of the core 1 with the tip surface of the pressing portion 10, and the folded portion 15 is moved. Make sure that it adheres to the core surface.

  Therefore, by performing these operations over the entire circumference under the indexing operation of the core 1, it is folded back in a substantially U shape at each direction changing portion of the yarn path 5 and continues in the circumferential direction. A belt layer composed of the belt cord d sufficiently adhered to the core surface over the entire length can be formed.

  By the way, in the case where the belt layer is formed in this way, the arrangement posture of the folded-back portion pressing block 7 is as shown in FIG. 6 in the cross-sectional view in the width direction of the core 1 with respect to the central axis c of the pressing block 7. It is preferable that the angle of intersection with the tangent t drawn on the side of the crown region 4 is 60 to 90 °.

  The extending form of the belt cord d of the formed belt layer in the crown region 4 of the core 1 is based on, for example, changing at least one of the rotational speed of the core 1 and the reciprocating speed of the yarn path 5. As shown in FIG. 9 (b), it can be the same as described in the prior art, and as shown in FIG. 7 (a), compared to the side of the crown region 4, A mode in which both the tread cord interval at the center of the belt and the belt cord angle with respect to the circumferential direction of the core are both increased, or as shown in FIG. The belt cord angle with respect to the circumferential direction may be constant over the entire crown region 4 while increasing at the central portion.

  Further, as illustrated in FIG. 8, the belt cord d is extended in a U-shaped manner at the center portion of the crown region 4, a manner in which the belt cord d is bent in a crank shape at the central portion of the crown region 4, and the crown region One half of 4 can be folded in a plurality of places, and the other half can be folded in a plurality of places in a valley, etc. The belt cord d has folded portions 15 formed on the respective side portions of the crown region 4 and continuously extends in a zigzag shape in the circumferential direction of the core 1 in a development plan view of the belt layer. .

It is an approximate line perspective view showing an embodiment of a device concerning this invention. It is a rough-line plane sectional view which shows the movable part of a folding | returning part pressing block. It is an expansion approximate line perspective view which shows the sliding structure of a folding | returning part pressing block. It is an approximate line top view showing an example of a function of a return part pressing block under the structure shown in FIG. It is process drawing which shows the effect | action of a folding | returning part pressing block. FIG. 10 is a cross-sectional view in the width direction of the core, illustrating the disposition posture of the folded portion pressing block. It is a top view which illustrates the extension aspect in a crown area of a belt cord. It is a top view which illustrates other extension modes of a belt cord. It is a figure which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core 2 Motor 3 Drive shaft 4 Crown area 5 Yarn path 6 Robot 7 Folding part pressing block 8 Frame 9 Pin 10 Pressing part 11 Cylinder block 12 Rail 13 Slider 14 Clamping means 15 Folding part d Belt cord c Center axis t Tangential line

Claims (4)

The belt cord has a donut shape as a whole, and extends between one side and the other side of the crown region of the core having an outer surface shape corresponding to the inner surface shape of the tire, and the entire circumference of the core When forming a green tire by pasting one or more types of tire constituent members on the outer peripheral side of this belt layer,
While reciprocating the yarn path in the direction of the central axis of the core, the belt cord is fed out of the yarn path, and the rotational movement of the core around the central axis is controlled according to the movement of the yarn path. A belt cord is attached to the core, and the belt cord is wound around a pin abutted on the core surface by changing the direction of movement of the yarn path on one side and the other side of the crown region. The manufacturing method of the tire which forms the belt part by forming the return part of this, and pressing the return part on the core surface, and making it stick there.   The tire manufacturing method according to claim 1, wherein the rotation speed of the core is controlled to adjust the extending angle of the belt cord with respect to the circumferential direction of the core.   As a whole, it has a donut shape, an outer surface shape corresponding to the inner surface shape of the tire, a core that is rotated around the central axis, and a yarn path that is arranged close to the crown region of the core, A reciprocating motion is possible in the direction of the center axis of the core, and a pin that abuts against the core surface on each side of the crown region, and a belt cord turn-up portion formed around the pin by moving forward with respect to the pin. The tire manufacturing apparatus which arrange | positions the folding | returning part pressing block provided with the press part which presses a core surface. The tire manufacturing apparatus according to claim 3, wherein the folded portion pressing block can be displaced in a direction orthogonal to the central axis of the core.

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