JP2006347003A - Manufacturing method of tire and belt forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a tire having a belt wherein both end parts and central part in the width direction of the tire are different in the angle of inclination of steel cords, and a belt forming apparatus. <P>SOLUTION: In forming the belt by laminating a plurality of belt strips S with a predetermined length, each of which has one or more rubber-coated steel cords arranged thereto, on an expansible and contractible core body 51 composed of diametrically expansible and contractible rigid segments so as to turn the steel cords toward the angle of inclination and laminating the belt strips S on the expansible and contractible core body 51, the continuous held strips S are successively pressed to the expansible and contractible core body 51 from their leading end parts toward their rear end parts and cut into a predetermined length on the way of pressing or the belt strips S cut into the predetermined length are successively pressed to the expansible and contractible core body 51 from their leading end parts toward their rear end parts and the direction of the unpressed parts of the belt strips S is changed with respect to the pressed parts of the belt strips S on the way of pressing and the angle of inclination of the steel cords are changed between both end parts and central part in the width direction of the tire. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tire manufacturing method and a belt forming apparatus having a belt in which an inclination angle of a steel cord with respect to a tire circumferential direction is changed at both ends and a center portion in the tire width direction, and the change in the inclination angle is increased. In addition, the present invention relates to a device capable of accurately forming the angle change.

  A tire having a belt in which the inclination angle of the steel cord with respect to the tire circumferential direction is different at both ends and the center portion in the tire width direction has been conventionally known. For example, the inclination angle of the steel cord with respect to the tire circumferential direction is known. Has been proposed (see, for example, Patent Document 1) that is large at both ends in the tire width direction (see, for example, Patent Document 1). According to this tire, the center portion of the steel cord has a small inclination angle with respect to the circumferential direction. By increasing the inclination angle of the steel cord at both ends in the tire width direction while ensuring the belt's hoop effect, the circumferential distance between the steel cords at both ends can be increased, thereby preventing the belt end separator. It is said that.

According to Patent Document 1 relating to this prior art, as a first method for changing the inclination angle of the steel cord at the center and both ends, a method for optimally designing a mold during vulcanization is the second method. As a method, a method is described in which, when a tire is molded, an unvulcanized belt treat is pasted, a metal roller is pressed, the raw tire body is rotated, the pressing pressure is controlled, and the metal roller moves in the width direction.
JP-A-6-55907

  However, in the method described in Patent Document 1, it is not possible to increase the angle difference of the steel cord between the center portion in the width direction and both ends of the steel cord, and this angle difference once forms a belt. Therefore, it is difficult to obtain an angle difference with high accuracy because it is changed by applying an excessive force.

  The present invention has been made in view of such problems in the formation of a belt member, and relates to a method for manufacturing a tire having a belt in which the inclination angle of a steel cord is different at both ends and the center in the tire width direction. It is an object of the present invention to provide a method for manufacturing a tire and a belt forming apparatus used therefor, in which the change in the inclination angle of the steel cord can be increased and the angle difference can be accurately formed. .

<1> is a method of manufacturing a tire having a belt in which the inclination angle of the steel cord with respect to the tire circumferential direction is different between the both ends and the center of the tire width direction.
The belt is formed by pasting a plurality of belt strips of a predetermined length with one or more steel cords with rubber arranged on an expansion / contraction core body composed of rigid segments capable of expansion / contraction diameter, so that the steel cords face the inclination angle. And
In sticking the belt strip on the expansion / contraction core body,
The continuous belt strip is pressed against the expansion / contraction core body sequentially from the front end portion toward the rear end portion, and the belt strip is cut into the predetermined length in the middle of pressing,
Alternatively, the belt strip that has been cut to a predetermined length is pressed against the expansion / contraction core body sequentially from the front end portion toward the rear end portion,
This is a tire manufacturing method in which the inclination angle of the steel cord is changed between the widthwise both ends and the central portion by changing the direction of the unpressed portion with respect to the pressed portion during pressing.

  Here, “on the expansion / contraction core body” means the case where the expansion / contraction core body is pasted directly onto the expansion / contraction core body, or by pasting onto another tire component member that has already been pasted onto the expansion / contraction core body. It shall include both cases where it is applied indirectly on the body. The belt strip includes one made of only one steel cord with rubber.

  <2> The tire according to claim 1, wherein in <1>, the orientation of the non-pressed portion with respect to the pressed portion is changed by controlling an approach angle of the non-pressed portion to the peripheral surface of the expansion / contraction core body. It is a manufacturing method.

  <3> is a method for manufacturing a tire according to <1> or <2>, in which a belt strip made of one steel cord with rubber is stuck on an expansion / contraction core body to form the belt.

  <4> uses <1> or <2> to form a plurality of types of belts including two types having different belt circumferential lengths at the time of belt formation. The value obtained by adding or subtracting a predetermined adjustment allowance to the common divisor for the collection of products of the belt circumference and sinα obtained for each type of belt, where α is the minimum inclination angle of the steel cord in the circumferential direction when forming. Is a method of manufacturing a tire having the width of the belt strip.

  <5> In any one of <1> to <4>, rubber is applied to the steel cord wound from the cord reel in parallel with the continuous belt strip being stuck on the expansion / contraction core body of the tip portion. Is a tire manufacturing method for forming a continuous belt strip.

  <6> In any one of <1> to <5>, after pasting a carcass band on the circumference of the expanded / contracted core body having a reduced diameter and engaging both sides of the center part of the carcass band with a bead core, This is a tire manufacturing method in which the belt is formed on the circumference of the center portion of the carcass band that is expanded in diameter and bulged by the expansion / contraction core body.

<7> is a belt forming apparatus used in the tire manufacturing method according to any one of <1> to <6>,
A strip applicator comprising a strip applicator for cutting the predetermined length portion of the continuous belt strip and adhering it onto the expansion / contraction core body, and an applicator control means for displacing the strip applicator in the axial direction of the expansion / contraction core body. A pressing roller for pressing a predetermined length portion of the belt strip against the expansion / contraction core body, and a cutter for cutting the predetermined length portion of the continuous belt strip,
Displacement of the pressing roller disposed in the strip applicator is synchronized with the rotational speed of the expansion / contraction core body so that the inclination angle of the steel cord changes at both ends and the center in the tire width direction. The belt forming apparatus is configured to control the speed, the direction of the pressing roller with respect to the circumferential direction of the expansion / contraction core body, and the direction in which the belt strip enters the pressing roller.

  <8> is a relay drum that feeds one or more steel cords from the cord reel and sends the belt strip to the strip applicator in <7>, and rubber is continuously applied to the steel cord between the cord reel and the relay drum. A belt forming apparatus comprising: a rubber coating machine that coats automatically, and a continuous strip forming means having a festoon that adjusts the excess and deficiency of the bell and strip generated between the strip applicator and the relay drum.

  According to <1>, the belt strip is pressed on the expansion / contraction core body while being bent, and these are arranged in the circumferential direction to form the belt member. Compared to the case where the steel cord is wound on the expansion / contraction core body in the circumferential direction, the steel cord can be easily and accurately bent and deformed. Even belts that are greatly different from each other can be formed with high accuracy, and further, the expansion / contraction core body is composed of rigid segments, so that bending deformation of the steel cord can be performed with higher accuracy.

  According to <2>, since the direction of the unpressed portion relative to the pressed portion is changed by controlling the angle of entry of the unpressed portion into the expansion / contraction core body circumferential surface, the steel cord relative to the tire circumferential direction is changed. The tilt angle can be reliably controlled.

  According to <3>, since the belt is formed by sticking a belt strip made of a steel cord with rubber on the expansion / contraction core body, even if it is a belt made of steel cord bent at an acute angle, It can be formed easily and accurately.

  According to <4>, the belt strip to be used is made of a plurality of steel cords with rubber, so that the number of belt strip application can be reduced, the belt can be formed efficiently, and the belt When forming a plurality of types of belts including two different belt circumferences at the time of formation, α was the minimum inclination angle with respect to the circumferential direction of the steel cord at the time of belt formation, and was obtained for each type of belt. Since the width of the belt strip is a value obtained by adding or subtracting a predetermined adjustment allowance to the common divisor for the collection of products of the belt circumference and sin α, as described later, the plurality of sizes have the same width as the belt strip. It can be formed by the process, which can improve the production efficiency and simplify the process.

  <5> According to <5>, the continuous steel cord stuck on the expansion / contraction core body is formed by covering the steel cord unrolled from the cord reel in parallel with the sticking of the steel cord tip. Steel cords coated with rubber in various states can be connected and arranged, and rubbers can be well bonded.

  <6> According to <6>, after a carcass band is pasted on the circumference of the reduced diameter expansion / contraction core body, both sides of the carcass band center part are locked with a bead core, the diameter of the expansion / contraction core body is increased, and the expansion / contraction core body bulges out. Since the belt member is formed on the periphery of the carcass band at the center of the carcass band, a belt tread band composed of a belt and a tread prepared separately is transferred onto the outer periphery of the carcass band and combined with the conventional molding method. By forming the belt directly on the carcass band with high accuracy, the relative positional accuracy between the belt and the carcass band can be greatly improved.

  According to the invention <7>, since it is configured as described above, the tire manufacturing method according to any one of <1> to <6> can be realized with a simple device.

  According to the invention <8>, since the continuous line and the intermittent line are directly connected via the festoon, the capability of these lines is individually determined in the tire manufacturing method according to any one of <1> to <6>. The productivity can be increased.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a quarter portion of a tire formed by the tire manufacturing method of the first embodiment. A tire 9 includes a carcass C in which both side portions are folded around a bead core B, and a width direction of the carcass C. A belt 1B, 2B, a tread TR, and a sidewall SW reinforced with steel cords are provided on the radially outer side of the central portion in the width direction of the carcass C, with an inner liner IL provided inside the central portion. Configured. In addition to these members, a canvas chafer CF and a bead filler F for reinforcing the periphery of the bead core are also provided.

The steel cords of the two-layer belts 1B and 2B are inclined in opposite directions with respect to the tire circumferential direction, and in any belt, the inclination angle of the steel cord with respect to the tire circumferential direction is high at the center in the width direction. It is configured to be large at both ends in the width direction. FIG. 2 is a developed view of the belt 1B showing the arrangement of the steel cord, taking the belt 1B inside in the radial direction as an example. In the illustrated case, the inclination angle of the steel cord with respect to the circumferential direction Y is θ _C at the center. a theta _E at both ends, relation theta _E is greater than theta _C holds.

  In such a tire, both ends of the steel cord SC can be obtained by increasing the inclination angle of the steel cord at both ends in the tire width direction while securing the belt hook effect by the central portion having a small inclination angle with respect to the circumferential direction Y. It is possible to widen the circumferential distance of the steel cord at the portion, thereby preventing belt end separation.

  In the arrangement mode of the steel cord shown in FIG. 2, the change in the angle from the both end portions to the central portion is gradual, but the same effect can be obtained by gradually changing the angle.

  The tire manufacturing method and belt forming apparatus of the present invention are continuous belts in which the steel cord angle with respect to the circumferential direction changes at both ends and the center in the width direction, even if this angle change is gradual. Can be advantageously applied to form the belt, and not only when the circumferential angle is smaller at the center than at both ends, but vice versa, Furthermore, the present invention can also be applied to a case where the circumferential angle of the steel cord changes in a complicated manner depending on the position in the width direction.

  3 to 6 are cross-sectional views showing a state in which the unvulcanized member constituting the tire 9 shown in FIG. 1 is assembled on a molding drum. A method of molding will be described. First, as shown in FIG. 3A, a canvas chafer CF, an inner liner IL, and a carcass C are attached in this order on the circumference of a cylindrical drum 50 capable of expanding and contracting to form a carcass band CB.

  Next, after holding the preset bead PB in which the bead filler F is pre-assembled to the bead core B and arranging it outside the radial direction of the CB, as shown in FIG. 3 (b), the cylindrical drum 50 is enlarged to expand the carcass band CB. And the preset bead PB are assembled, and then the carcass band CB is removed from the cylindrical drum 50 by reducing the diameter of the cylindrical drum 50 while holding the preset bead PB, as shown in FIG. The carcass band CB with the preset bead PB is attached to the outside in the radial direction of the molding drum 21 as shown in FIG.

  The molding drum 21 includes an expansion / contraction core body 51 in which a plurality of segments 51a made of a rigid body are arranged in an annular shape inside and outside in the radial direction, a center bladder 52 covering the expansion / contraction core body 51, and a bead core B from the inside in the radial direction. Each bead lock mechanism 53 for supporting and fixing, and a folding mechanism 54 for turning back both side parts CBS of the carcass band CB located outside the bead core B around the bead core B are configured to expand the diameter of the bead lock mechanism 53. As a result, the carcass band CB with preset beads PB disposed on the molding drum 21 is positioned and held on the molding drum 21 as shown in FIG.

  Next, the internal pressure is supplied to the inside of the center bladder 52 and the distance between the bead lock mechanisms 53 on both sides is narrowed, so that the central portion CBC of the carcass band between the bead cores B is formed in a toroidal shape as shown in FIG. Then, using the folding mechanism 54, the carcass band both side parts CBS are folded as shown in FIG. 5 (a). After the folding is completed, the stitcher 55 is turned on as shown in FIG. 5 (b). Is operated to crimp the carcass band both side parts CBS to the carcass band center part CBC.

  Subsequently, the diameter of the expansion / contraction core body 51 is increased, and the expansion / contraction core body 51 supports the top portion of the carcass band central portion CBC. Then, as shown in FIG. Affix the inner belt 1B, affix the outer belt 2B in the same manner (see FIG. 6B), and finally attach the tread TR and the sidewall SW as shown in FIG. 6C to form a raw tire. To complete. After this, the tire is vulcanized into a finished product.

  Here, as a method of molding the raw tire, the belts 1B and 2B and the tread rubber TR are assembled in advance to form a belt tread band according to a customary manner, and this belt tread band is placed outside the bulged carcass band central portion CBS. In contrast to this, the raw tire molding method described in detail above directly assembles the belt and tread rubber to the bulged carcass band, so it conveys the belt tread band. This eliminates misalignment with the carcass band, and can form a high-precision tire. In addition, when assembling the belt or tread rubber on the carcass band, the rigid expansion / contraction core body 51 is used as a base, and is attached. The pasting itself can be performed with high accuracy, which is preferable.

  In the green tire molding method described above, when the belts 1B and 2B are assembled to the carcass band CB, the present invention provides a plurality of predetermined lengths in which one or more steel cords with rubber are arranged on the expansion / contraction core body 51. A belt strip is applied in order to form the belt, and the inclination direction of the steel cord is changed between the belt width end and the center by changing the inclination direction in the middle of attaching each belt strip. This point will be described by taking the first to fourth embodiments as an example.

  7 is a plan view showing the belt forming apparatus 1 according to the first embodiment of the present invention, FIG. 8A is a perspective view thereof, and FIG. 8B is a view taken along the line bb in FIG. 8A. In the figure, reference numeral 22 denotes a molding carriage, 21 denotes a molding drum rotatably supported by the molding carriage 22, and 51 denotes an expansion / contraction core body holding the carcass C on the outer periphery. .

  In this embodiment, the belt strip is made of a single steel cord with rubber, and the steel cord G with rubber is pasted on the expansion / contraction core body 51. The belt forming apparatus 1 is a continuous steel cord with rubber. A strip affixing machine 10 that affixes the predetermined length portion of G on the expansion / contraction core body 51 and cuts it, an affixing machine control means 30 that displaces the strip affixing machine 10 in the axial direction of the expansion / contraction core body 51, and continuous steel with rubber A continuous strip forming means 20 for forming the code G and supplying it to the strip applicator 10 is provided.

  And the strip sticking machine 10 cuts the predetermined length part of the steel roller G with the pressing roller 13 which presses against the expansion / contraction core body 51 from the front-end | tip part of the predetermined length part of the steel cord G with rubber | gum to the rear end part. The cutter 12 and the guide roller 18 for introducing the steel cord G with rubber are attached to the attachment plate 11.

  The mounting plate 11 is connected to the swing plate 33 via a connecting rod 36, and the swing plate 33 is configured to travel on the traversing plate 31. The travel path of the swing plate 33 is the traversing plate. The cam groove 32 provided in 31 is specified by engaging two cam followers 35 attached to the swing plate 33. More specifically, the cam groove 32 is provided so that the swing plate 33 swings around the pressing roller 13, thereby driving the motor 34 to move the swing plate 33 to the traverse plate. By running on 31, the direction with respect to the circumferential direction of the steel cord G with rubber stretched between the pressing roller 13 and the guide roller 18 and entering on the expansion / contraction core body 51 is changed, and the shaft of the pressing roller 13 is also adjusted. The direction of the heart can be changed so as to be orthogonal to the steel cord G with rubber.

  Further, the traversing plate 31 is configured to be reciprocally displaced in a direction parallel to the axis of the expansion / contraction core body 51, that is, in the X direction by means not shown. A control device (not shown) is provided, and this control device drives a motor (not shown) that drives the transverse plate 31 to position the expansion / contraction core body 51 of the pressing roller 13 in the axial direction (X direction). Is controlled in synchronization with the rotational position of the forming drum 21 and the motor 34 is driven to determine the direction of the axial center of the pressing roller 13 and the direction in which the rubberized steel cord G enters the pressing roller 13. It is configured to control in synchronization with the rotational position.

  The traversing plate 31, the cam groove 32, the swing plate 33, the motor 34, the cam follower 35, and the connecting rod 36 described above and the control device (not shown) constitute the pasting machine control means 30.

  The continuous strip forming means 20 also includes a reel stand 5 that rotatably supports the cord reel 4, a steel cord U that is not covered with rubber is fed from the cord reel 4, and a steel cord G with rubber is continuously fed to the strip applicator 10. The relay drum 6 is continuously fed, the rubber coating machine 7 that continuously coats the cord U with rubber between the cord reel 4 and the relay drum 6, and the strip sticking machine 10 that operates intermittently. A festoon 8 for adjusting the excess or deficiency of the steel cord G with rubber generated with the relay drum 6 is provided.

  The rubber coating machine 7 has a through-hole through which the steel cord U passes, and an insulation head 15 that continuously coats the cord with rubber in the through-hole, and the coating rubber continuously from the direction perpendicular to the through-hole. And a rubber extruder 16 to be supplied.

  FIG. 9 and FIG. 10 are schematic views showing a procedure for sticking rubber-equipped steel cords G one by one on the expansion / contraction core body 51. With reference to these drawings, the belt forming apparatus 1 described above is shown. A method of forming the belt 1B or 2B using the above will be described. In this figure, the paper surface represents a surface obtained by expanding the peripheral surface of the expansion / contraction core body 51 into a flat surface, the straight line TP represents an intersection line between the surface passing through the axis of the expansion / contraction core body 51 and the peripheral surface, and the straight line L is The crossing line which the equator surface and peripheral surface of the expansion / contraction core body 51 make is represented.

In these drawings, the pressing roller 12 moves on the straight line TP by moving the transverse plate 31 in the X direction, and drives the motor 34 with the swing plate 33 guided by the cam groove 32. By moving on the traversing plate 31, the direction can be changed while being located at one point on the straight line TP. In the state shown in FIG. 1B transverse plate 31 so as to be positioned on the left end surface is positioned in, the swing plate 33 so that the orientation is theta _E is positioned with respect to the circumferential direction of the rubber with steel cord G entering on scaling the core body 51.

  Here, the end of the steel cord G with continuous rubber remaining after being cut into a predetermined length is held by the cutter 12 by, for example, its rubber adhesive force. Prior to transfer to 51, the cutter 12 is moved to the position shown in the figure on the left end face of the belt 1B, and at that position, the cutter 12 is moved down so that the tip of the rubber-coated steel cord G is expanded / contracted. After being transferred to the carcass band CB on the body 51, the molding drum 21 is rotated to a position where the pressing roller 13 faces the tip of the rubber-equipped steel cord G, and then the pressing roller 13 is lowered to rubber-equipped steel. By pressing the tip of the code G, the state shown in FIG. 9A can be obtained.

Next, the expansion / contraction core body 51 is rotated in the direction of the arrow CW, and the traveling plate 31 is moved in a direction X parallel to the axis of the expansion / contraction core body 51 in synchronization with this rotation. The movement amount x at this time satisfies the relationship of Expression (1), where y is the movement amount in the CW direction of the circumferential surface forming the belt 1B.

x = (y / tanθ _E) (1)

Then, when the pressing roller 13 has reached the pair circumferential direction an angle change point of the steel cord, i.e., at the time point when x = x _0, as shown in FIG. 9 (b), enters on scaling the core body 51 The motor 34 is driven to move the swing plate 33 so that the circumferential direction of the steel cord G with rubber is θ _C, and then the traverse plate 31 is further moved in the X direction (see FIG. 9B). ), the moving amount x ₁ at this time so as to satisfy the equation (2), controls the amount of movement of the transverse plate 31.

(Y ₁ −y ₀ ) / (x ₁ −x ₀ ) = tan θ _C (2)

Next, the belt 1B is further moved in the CW direction, and the transverse plate 31 is moved in the X direction in synchronization with the belt 1B. When the pressing roller 13 reaches the second circumferential angle change point of the steel cord, that is, when it becomes the x = x _2, as shown in FIG. 10 (a), so that the orientation with respect to the circumferential direction of the rubber with steel cord G entering on scaling the core body 51 is theta _E, the motor 34 Drive to move the rocking plate 33.

Then, while the pair circumferential angle entering on scaling the core body 51 of rubber with steel cord G has been held in the theta _E, it moves the belt 1B in the CW direction, X direction transverse plate 31 in synchronism with this is moved, when it has finished pressed with rubber steel cord G in the length of one roll to affix on scaling core body 51, i.e., at the time point when x = x _3, rotation of the expansion core 51 Is stopped, and the end of the steel cord G with rubber having a predetermined length is cut with the cutter 12.

  Thereafter, the front end of the steel cord G with continuous rubber remaining after being cut is held by the cutter 12 and waits, the molding drum 21 is moved, and the expansion / contraction core body 51 in which the formation of the belt 1B is completed is withdrawn to the next station. The expansion / contraction core body 51 in which the belt 1B is not formed is made to enter from the front station to prepare for the formation of the belt 1B. Thereafter, the tip of the steel cord G with continuous rubber is moved to a position on the left end surface of the belt 1B, that is, a position of x = 0, and a cycle is completed.

  In the process of pasting the steel cord G with rubber described above on the expansion / contraction core body 51, the weight 14 of the festoon 8 rises as the steel cord G with rubber is pasted, and the amount of cord storage in the festoon 8 is On the other hand, the supply to the cord G with rubber to the festoon 8 is performed by the relay drum 6, and the relay drum 6 winds the cord G with rubber and simultaneously releases the wound cord G with the rubber wound. Constructed, the rubberized cord G released is drawn in by the weight 14 of the festoon 8 and stored in the festoon 8. Since the cord of the rubberized cord G wound around the relay drum 6 is directly connected to the cord reel 4, the cord U is fed out from the cord reel 4 by winding up the relay drum 6, but the cord U is fed from the cord reel 4. After being fed out, the rubber passes through a through hole provided in the insulation head 15 of the rubber coating machine 7, and at this time, the rubber supplied from the rubber extruder 16 is coated around the cord U.

  The belt forming method according to the first embodiment in which the belt is formed by using the belt forming apparatus 1 to form the belt by sequentially attaching the belt strip made of one steel cord with rubber G on the expansion / contraction core body 51 in the circumferential direction. However, by using the same device as the belt forming device 1, a belt can be formed by sequentially sticking a belt strip made of a plurality of rubber-coated steel cords on the expansion / contraction core body 51 in the circumferential direction. Is described below.

  FIG. 11A is a schematic perspective view showing the belt forming apparatus 41 of the second embodiment, and FIG. 11B is an arrow view corresponding to the arrow bb in FIG. In the figure, the same reference numerals as those shown in FIG. 8 are used for the same components as those of the belt forming apparatus 1 of the first embodiment.

  The belt forming device 41 affixes belt strips S having a width D made of a plurality of steel cords with rubber on the expansion / contraction core body 51, and these belt strips S in the circumferential direction with an adjustment allowance δ (in the illustrated case, an overlap allowance) A strip affixing machine 10A for affixing and cutting the predetermined length portion of the continuous belt strip S on the expansion / contraction core body 51, and affixing for displacing the strip applicator 10A in the axial direction of the expansion / contraction core body 51 Machine control means 30 comprises continuous strip forming means 40 for forming a continuous belt strip S and feeding it to the strip applicator 10A.

  Then, the strip applicator 10 has a pressing roller 13A that presses against the expansion / contraction core body 51 from the front end portion to the rear end portion of the belt strip S on the mounting plate 11A, and the belt strip S with a predetermined length portion. A cutter 12A to be cut and a guide roller 18A for introducing the belt strip S are attached. The cutter 12A, the pressing roller 13A, and the guide roller 18A are formed of a plurality of rubber-coated steel cords G. It is comprised so that it may handle, and only this point differs from the strip sticking machine 10 of 1st embodiment which handles the belt strip which consists of one steel cord G with a rubber | gum.

  Here, the sticking machine control means 30 can use the completely same thing as the sticking machine control means 30 in 1st embodiment shown in FIG. 8, and the axial direction of the expansion-contraction core body 51 of the press roller 13A ( X direction) position is controlled in synchronization with the rotational position of the molding drum 21, and the direction of the axial center of the pressing roller 13 </ b> A and the direction in which the belt strip S enters the pressing roller 13 </ b> A is synchronized with the rotational position of the molding drum 21. Configured to control.

  Further, a continuous strip forming means 40 for forming a continuous body of belt strips S made of a plurality of steel cords with rubber includes a plurality of cord reels 44 that house steel cords, and steel from which these cord reels 44 are not covered with rubber. A relay drum 46 for feeding out the cord U and continuously feeding the belt strip S to the strip sticking machine 10A, and a rubber for continuously covering the bundle of steel cords U between the cord reel 44 and the relay drum 46 with rubber. The coating machine 47 and the festoon 48 that adjusts the excess or deficiency of the belt strip S generated between the intermittently operating strip applicator 10A and the continuously operating relay drum 46 are provided.

  The rubber coating machine 47 has a through hole that allows a plurality of steel cords U to pass therethrough, and in the through hole, an insulation head 45 that continuously coats rubber on the steel cords that are arranged in a row and bundled, and And a rubber extruder 49 for continuously supplying the covering rubber from a direction orthogonal to the through hole.

  In order to affix the belt strip S on the expansion / contraction core body 51 using the belt forming apparatus 41 configured as described above, it is affixed in the same manner as that performed on the steel cord G with rubber in the first embodiment. What is necessary is just to replace the steel cord G with rubber | gum in the previous description about 1st embodiment with the belt strip S.

FIGS. 12 and 13 are development views showing the belt formed by sticking the belt strip S made of a plurality of rubber cords with a predetermined length on the expansion / contraction core body 51 and arranging them in the circumferential direction. 12 shows a case where the inclination angle θ _E with respect to the circumferential direction at both ends in the width direction of the belt is larger than the inclination angle θ _{C at the} center in the width direction, and the circumferential extending width W of the belt strip S is the width of the belt. Short at both ends in the direction and long at the center in the width direction of the belt, a gap d is formed between the belt strips S adjacent in the circumferential direction at both ends, and the average density of the steel cord is sparser than that in the center in the width direction. As a result, the elastic effect of rubber can be increased, and as a result, local shear strain at the belt end can be suppressed and high-speed durability can be improved. However, since the inclination angle θ _C of the steel cord in the central portion in the width direction is kept small, it is possible to maintain the belt's tagging effect.

On the other hand, FIG. 13 shows a case where the inclination angle θ _E with respect to the circumferential direction at both ends in the width direction of the belt is made smaller than the inclination angle θ _{C at the} center in the width direction. In this case, the width is increased by increasing the inclination angle θ _C. The overall rigidity of the belt is reduced by reducing the circumferential rigidity at the center in the direction, suppressing the passing noise that changes with the circumferential rigidity here, and reducing the inclination angle θ _E at both ends in the width direction. Can be held.

Here, when forming a plurality of types of belts including two types having different belt circumferential lengths at the time of belt formation, the width D of the belt strip S is the circumferential width in any of the cases shown in FIGS. The belt perimeter obtained for each type of belt, where α is the minimum value of the inclination angle with respect to the direction (θ _{C in} the case shown in FIG. 12, θ _{E in the} case shown in FIG. 13), The common divisor for the collection of products with sin α is preferably a value obtained by adding or subtracting a predetermined adjustment allowance (the overlap allowance δ shown in FIG. 11B), so that for all types of belts, A belt strip S with a single width D can be used, making the manufacturing process very simple and the mixed flow production of tires with these types of belts with almost zero size switching time for belt formation Can be made possible.

  Next, a third embodiment will be described. As in the second embodiment, the belt forming apparatus according to this embodiment has a belt strip S made of a plurality of steel cords with rubber adhered on the expansion / contraction core body 51, and is shown in FIG. The belt forming apparatus of the present embodiment is formed, but has a strip applicator and an applicator control means having a configuration different from that of the second embodiment. FIG. 14 is a plan view showing the belt forming apparatus, FIG. FIG. 16 is a perspective view showing the strip applicator, FIGS. 17 and 18 are schematic views showing the internal structure of the strip applicator in different states, and FIG. 19 is an arrow view in FIG. FIG. 20 is an arrow view corresponding to the arrow Y-Y in FIG. 17, and in the drawing, reference numeral 22 denotes a molded carriage and 21 denotes a molded carriage 22. Molded support supported by The beam, then 51 depicts an expansion core body holding the carcass C on the outer circumference.

  The belt forming device 61 affixes a belt strip S having a width D made of a plurality of steel cords with rubber, the cross-sectional structure of which is shown in FIG. A strip affixing machine 60 and a strip affixing machine 60 that are configured to be arranged in the circumferential direction with a margin of overlap (in the case of illustration), affixing the predetermined length portion of the continuous belt strip S on the expansion / contraction core body 51, An affixing machine control means 80 for displacing the expansion / contraction core body 51 in the axial direction and a continuous strip forming means 40 for forming a continuous belt strip S and supplying it to the strip affixing machine 60 are provided. Here, the continuous strip forming means 40 can be configured in exactly the same way as the continuous strip forming means of the same sign described in the second embodiment.

  The strip applicator 60 includes a cylindrical case 62 and a rectangular case 63 that is integrally provided at the lower end thereof and extends to the left and right. On the other hand, the applicator control means 80 has a cylindrical case via a horizontal bearing portion 82b. A traveling base 82 that rotatably supports 62, and a vertical base 82a of the traveling base 82 that is attached in an L shape to the horizontal bearing portion 82b, is parallel to the axis of the expansion / contraction core body 51 (X direction). ), A control device (not shown) that controls both the two rails 81 supported so as to be reciprocally displaceable, the rotation of the cylindrical case 62, and the traveling of the traveling table 82 in synchronization with the rotation of the expansion / contraction core body 51. ).

  Although not shown in the drawing, the vertical base 82a incorporates a turning motor and a traveling motor. By driving the turning motor, the rectangular case 63 is connected to the cylindrical case 62 via a backlashless gear mechanism (or timing belt). And the strip applicator 60 can be reciprocated along the rail 81 by driving of the traveling motor, and the control device (FIG. (Not shown) is configured to control the rotational positions and rotational speeds of the turning motor and the traveling motor.

  In the cylindrical case 62, a pulling roller 73 is disposed on the upper side and a feeding roller 64 is disposed on the lower side with a single vertical shaft in common, and a cutter 65 is provided between the pulling roller 73 and the feeding roller 64. ing.

The cutter 65 is affixed so that the belt strip S can be cut at an angle of θ ° with respect to the vertical axis (see FIG. 19). The cutter 65 has a structure capable of switching the cutting angle. Here, the angle θ ° is set to the inclination angle of the steel cord of the belt affixed on the expansion / contraction core body 51 with respect to the circumferential direction at both ends, that is, θ _E shown in FIGS.

  In the rectangular case 63, an inner case 69 is provided in which left and right guide rollers 67a and 67b and pressing rollers 66a and 66b are attached symmetrically. As shown in FIGS. 17 and 18, the guide rollers 67a and 67b composed of a plurality of rollers are continuous downward and gradually extend downward from the upper central portion toward the lower portions of the left and right pressing rollers 66a and 66b. ing.

  In the rectangular case 63, switching means (not shown) for moving the inner case 69 to the left and right is provided. When the inner case 69 is moved to the left as shown in FIG. The belt strip S inserted from above is drawn by the drawing roller 73, enters the right guide roller 67a of the inner case 69 by the feed roller 64, is guided by the right pressing roller 66a, and is shown by a solid line in FIG. As shown, the belt strip S whose tip is cut obliquely is pasted on the expanding / contracting core body 51 by running the strip pasting machine 60 in the left direction with the front side facing up.

  As shown in FIG. 18, when the inner case 69 is moved rightward by the switching means, it enters the left guide roller 67b from the feed roller 64 and is guided by the left pressure roller 66b. As shown in FIG. 2, the belt strip S is stuck on the expanding / contracting core body 51 by moving the strip sticking machine 60 in the right direction with the back side facing up.

  As shown in FIG. 20, when the belt strip S is attached with the front side up, and when the belt strip S is attached with the back side up, the oblique cutting angle at the tip is reversed. There is no difference between the front side and the front side of the belt strip S except that the oblique cutting angle at the tip is reversed.

  The process of affixing the belt strip S on the expansion / contraction core body 51 by the strip applicator 60 as described above will be described with reference to FIGS. 21 to 26 in which the peripheral surface of the expansion / contraction core body 51 is developed on a plane. In the figure, 51 indicates a core body. Actually, the carcass C is already pasted on the expansion / contraction core body 51. In this step, the belt strip S is pasted on the carcass C. In the drawing, arrows CW and CCW shown on the expansion / contraction core body 51 indicate the direction in which the peripheral surface is displaced in accordance with the rotation of the expansion / contraction core body 51.

In FIG. 21 to FIG. 26, the strip applicator 60 is shown only with guide rollers 67a and 67b and pressing rollers 66a and 66b, and the rail 81 for guiding the travel of the strip applicator 60 is not shown, but the expansion / contraction core The strip applicator 60 is configured to reciprocate in a direction parallel to the direction of the axis of the body 51. Prior to the application of the belt strip S to the expansion / contraction core body 51, the guide The swivel position of the strip applicator 60 is set so that the direction in which the rollers 67a and 67b guide and feed the belt strip S has an inclination angle of (90 ° −θ _E °) with respect to the traveling direction of the strip applicator 60. Set (θ _E is the angle of inclination of the steel cord in the circumferential direction at the end in the belt width direction).

  In the steps shown in FIGS. 21 to 24, the inner case 69 is switched to a state in which the belt strip S is guided by the guide roller 67a and pasted by the pressing roller 66a with the front surface facing upward. deep.

  FIG. 21 is a diagram in the middle of work in which a plurality of belt strips S are already pasted to the expansion / contraction core body 51. In this process, the strip pasting machine 60 is synchronized with the rotation of the expansion / contraction core body 51 in the CCW direction. The belt strip S is displaced on the expansion / contraction core body 51 while pressing the belt strip S drawn out from the strip applicator 60 by the pressing roller 66a. When the position is x (x = 0 at the belt end), the traveling speed of the strip applicator 60 is set so that the circumferential inclination angle at each position of the belt strip S becomes a predetermined function θ (x). Control the tilt angle in the circumferential direction.

  When the expansion / contraction core body 51 is rotated at a constant rotational speed ω (radian / s), the belt circumferential length is L (m), and the displacement speed v (m / s) of the strip applicator 60 is expressed by Equation (3). What is necessary is just to control so that it may satisfy | fill, and the inclination angle of the strip sticking machine 60 should just be controlled so that this may correspond to (theta) (x), and the strip which sticks the part only x away from the belt width method rear end For example, the pasting machine 60 controls to take the position and posture indicated by the two-dot chain line in FIG.

  In addition, when affixing the front end, the cut end of the front end is aligned with the belt strip S that has been affixed first, and this is affixed so that the edges in the width direction have a predetermined overlap margin δ.

At a time near the end of the outward travel, the belt strip S is cut into a predetermined length by the cutter 65 at the angle θ _C , the driving of the drawing roller 73 and the delivery roller 64 is stopped, and the belt strip S is further transported. The rear end is pressed and arranged, and the outbound journey is terminated.

  Instead of the above-described attaching method, the belt strip S may be first cut to a predetermined length, and the cut belt strip S may be pressed and disposed on the expansion / contraction core body. Also, the forward speed and the circumferential direction inclination angle of the strip applicator 60 are controlled as described above so that the circumferential direction inclination angle at each position of the belt strip S becomes a predetermined function θ (x). There is a need.

  Next, the rotation of the expansion / contraction core body 51 is stopped, and the strip applicator 60 is turned 180 ° as shown in FIG.

  Then, the expansion / contraction core body 51 is rotated by a predetermined angle to change the attachment position of the belt strip S to the following, and the tip of the belt strip S is attached with the cut end as shown in FIG. As shown in FIG. 24, when the strip applicator 60 goes backward in the right direction, the expansion / contraction core body 51 is rotated in the CW direction, and the belt strip S is moved in the circumferential direction of the expansion / contraction core body 51 by the pressing roller 66a. The sheet is pasted on the expansion / contraction core body 51 with the front side facing up so that the angle θ (x) is set to the belt strip S and the overlap margin is δ. .

  By repeating the above steps, a number of belt strips S corresponding to one tire are sequentially stuck on the expansion / contraction core body 51 to form a belt with the front surface facing up.

Using the belt formed as described above as a belt 1B located on the inner side in the radial direction of the tire, the raw tire with the belt 1B attached is moved to the next application station, and another belt forming apparatus is used. Similarly, the belt 2B positioned on the radially outer side can be formed. However, when the belt 2B is continuously formed using the same belt forming device 61, the following steps may be performed. That is, the strip applicator 60 is turned by 2θ _E °, and the guide roller and the pressing roller used by moving the inner case 69 are switched to 67b and 66b, respectively.

  Then, as shown in FIG. 25, by running the strip applicator 60 and rotating the expansion / contraction core body 51, this time, with the pressing roller 66b, the back surface of the belt strip S is turned upward and pressed onto the expansion / contraction core body 51. I will arrange it.

  In the same manner as described above, when the rear end of the cut belt strip S is pasted, the strip pasting machine 60 is turned 180 ° as shown in FIG. Then, after the expansion / contraction core body 51 is rotated by a predetermined angle to change the circumferential application position of the next belt strip S, the belt strip S is similarly connected between the edges of the belt strip S previously applied. Is pasted on the expansion / contraction core body 51 with the back surface facing up.

  By repeating the above steps, a number of belt strips S corresponding to one tire are sequentially attached to the expansion / contraction core body 51, and when these are aligned without gaps in the circumferential direction, the belt 2B is formed with the back side up. Exit.

  Even in the above-described steps of attaching the belt strip S to the expansion / contraction core body 51 with the back surface facing upward, the strip of the belt strip S so that the angle with respect to the circumferential direction of the expansion / contraction core body 51 is θ (x). It is the same that the forward speed and the inclination angle of the pasting machine 60 are controlled in synchronization with the rotational speed of the expansion / contraction core body 51.

  As described above, it is possible to form the two-layer belts 1B and 2B in which the inclination angle of the steel cord is the target with respect to the tire equator plane.

  Here, as described above, also in this embodiment, when forming a plurality of types of belts including two types having different belt circumferential lengths when forming the belt, the width D of the belt strip S is set in the circumferential direction. The minimum value of the inclination angle with respect to is preferably α, and it is preferable to set a value obtained by adding or subtracting a predetermined adjustment margin to the common divisor for the collection of products of the belt circumference and sin α obtained for each type of belt. A belt strip S of a single width D can be used for all types of belts, making the manufacturing process very simple and reducing the size change time for belt formation to almost zero. It can allow mixed flow production of tires with different types of belts.

  Next, a fourth embodiment will be described. The belt forming apparatus of this embodiment has a strip sticking machine and a sticking machine control means having the same configuration as that of the third embodiment, but the belt of the third embodiment is composed of a plurality of rubber-coated steel cords. While the strip S is affixed on the expansion / contraction core body 51, the steel cord G with rubber is configured to be affixed on the expansion / contraction core body 51 one by one. This is the only feature of the third embodiment. Is different.

  FIG. 27 is a perspective view showing the belt forming device. The belt forming device 71 sticks one rubber-equipped steel cord G onto the expansion / contraction core body 51 and arranges the rubber-equipped steel cords G in the circumferential direction. The strip pasting machine 60A is configured to paste the predetermined length portion of the continuous steel cord G with rubber G on the expansion / contraction core body 51 and cut the strip pasting machine 60A. An applicator control means 80 for displacing in the direction and a continuous strip forming means 20 for forming a continuous belt strip S and supplying it to the strip applicator 60A.

  Similar to the strip applicator 60 of the third embodiment, the strip applicator 60A is configured to include a cylindrical case 62A and a rectangular case 63A that is integrally provided at the lower end and extends to the left and right. As described with respect to the machine control means 80 and the third embodiment, the traveling table 82 that rotatably supports the cylindrical case 62A and the traveling table 82 are reciprocated in a direction (X direction) parallel to the axis of the expansion / contraction core body 51. Two rails 81 that are displaceably supported, and a control device (not shown) that controls both the rotation of the cylindrical case 62A and the traveling of the traveling base 82 in synchronization with the rotation of the expansion / contraction core body 51. Composed.

  Further, the internal structure of the strip applicator 60A is the same as that described above for the strip applicator 60, and detailed description thereof is omitted, but the cutter for cutting the rubber-coated steel cord G to a predetermined length is as follows. It is not necessary to incline with respect to the traveling direction of the steel cord G with rubber.

  The continuous strip forming means 20 can be the same as that described for the first embodiment. The reel stand 5 rotatably supports the cord reel 4, and the steel cord U not covered with rubber from the cord reel 4. A relay drum 6 that continuously feeds the steel cord G with rubber to the strip applicator 10, and a rubber coating machine 7 that continuously coats the steel cord U with rubber between the cord reel 4 and the relay drum 6, And a festoon 8 for adjusting the excess or deficiency of the steel cord G with rubber generated between the strip applicator 10 that operates intermittently and the relay drum 6 that operates continuously. Insulation head 15 having a through hole for passing U and continuously covering rubber on steel cord U in the through hole And a rubber extruder 16 for continuously supplying the covering rubber from a direction orthogonal to the through hole.

Using the belt forming apparatus 71 configured as described above, as shown in FIG. 2, the rubber-coated steel cord G is divided into an inclination angle θ _E with respect to the circumferential direction at both ends of the belt, and an inclination angle θ _{C at the} center. Are attached on the expansion / contraction core body 51 so that they are different from each other. The application method may be the same as that described in the third embodiment. For example, the application is performed in synchronization with the rotation speed of the expansion / contraction drum 51. This is the same as the third embodiment in that it is necessary to control the displacement speed and direction of 60A, and detailed description thereof will be omitted.

  The present invention can be applied to tires for various uses having a belt.

It is sectional drawing which shows the quarter part of the tire formed by the manufacturing method of the tire of this invention. It is an expanded view of the belt which shows the arrangement | positioning aspect of the steel cord in a belt. It is sectional drawing of the green tire in the middle of a shaping | molding explaining the process in which a tire structural member is assembled | attached on a shaping | molding drum. FIG. 4 is a cross-sectional view of a green tire illustrating a process following FIG. 3. FIG. 5 is a cross-sectional view of a green tire illustrating a process following FIG. 4. It is sectional drawing of the green tire explaining the process of following FIG. It is a top view which shows the belt forming apparatus of 1st embodiment which concerns on this invention. It is the perspective view and side view which show a belt formation apparatus. In 1st embodiment, it is a schematic diagram which shows the procedure at the time of sticking one steel cord with rubber | gum on an expansion / contraction core body. It is a schematic diagram which shows the procedure following the process shown in FIG. It is a perspective view which shows the belt forming apparatus of 2nd embodiment. It is a development view showing a belt formed by arranging belt strips. It is an expanded view which shows the belt formed in another arrangement | sequence aspect of a belt strip. It is a top view which shows the belt forming apparatus of 3rd embodiment. It is the perspective view and side view which show the belt forming apparatus of 3rd embodiment. It is a perspective view which shows a strip sticking machine. It is a schematic diagram which shows the internal structure of a strip sticking machine. It is a schematic diagram which shows the internal structure of a strip sticking machine in another state. It is an arrow view corresponding to the XX arrow view of FIG. It is an arrow view corresponding to the YY arrow view of FIG. It is a plane expanded view of the expansion / contraction core body peripheral surface for demonstrating the process of sticking a belt strip. FIG. 22 is a developed plan view for explaining a process following FIG. 21. FIG. 23 is a plan development view for illustrating a process following the process in FIG. 22. FIG. 24 is a plan development view for illustrating a process following the process in FIG. 23. FIG. 25 is a plan development view for explaining a process following FIG. 24. FIG. 26 is a plan development view for illustrating a process following the process in FIG. 25. It is a perspective view which shows the belt forming apparatus of 4th embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt forming apparatus 4 Cord reel 5 Reel stand 6 Relay drum 7 Rubber coating machine 8 Festoon 9 Tire 10, 10A Strip sticker 11, 11A Mounting plate 12, 12A Cutter 13, 13A Press roller 14 Weight 15 Insulation head 16 Rubber extrusion Machine 18, 18A Guide roller 20 Continuous strip forming means 21 Molding drum 22 Molding cart 30 Strip applicator control means 31 Traverse plate 32 Cam groove 33 Oscillating plate 34 Motor 35 Cam follower 36 Connecting rod 40 Continuous strip forming means 41 Belt forming device 44 Code reel 45 Insulation head 46 Relay drum 47 Rubber coating machine 48 Festoon 49 Rubber extruder 50 Cylindrical drum 51 Expansion / contraction core body 52 Center bladder 53 Bead lock mechanism 54 Folding Mechanism 55 Stitcher 60, 60A Strip Pasting Machine 61 Belt Forming Device 62, 62A Cylindrical Case 63, 63A Rectangular Case 64 Feeding Roller 65 Cutter 66a, 66b Pressing Roller 67a, 67b Guide Roller 69 Inner Case 71 Belt Forming Device 73 Retraction Roller 80 Strip sticking machine control means 81 Rail 82 Running platform 1B, 2B Belt B Bead core C Carcass CB Carcass band CF Canvas chafer F Bead filler G Steel cord with rubber IL Inner liner PB Preset bead S Belt strip SW Side wall TR Tread U Rubber Uncoated steel cord θ _E Inclination angle of steel cord at both ends of belt width direction θ _C Inclination angle of steel cord at center of belt width direction

Claims (8)

In the manufacturing method of a tire having a belt in which the inclination angle of the steel cord with respect to the tire circumferential direction is different at both ends and the center in the tire width direction,
The belt is formed by pasting a plurality of belt strips of a predetermined length with one or more steel cords with rubber arranged on an expansion / contraction core body composed of rigid segments capable of expansion / contraction diameter, so that the steel cords face the inclination angle. And
In sticking the belt strip on the expansion / contraction core body,
The continuous belt strip is pressed against the expansion / contraction core body sequentially from the front end portion toward the rear end portion, and the belt strip is cut into the predetermined length in the middle of pressing,
Alternatively, the belt strip that has been cut to a predetermined length is pressed against the expansion / contraction core body sequentially from the front end portion toward the rear end portion,
A method for manufacturing a tire in which the inclination angle of the steel cord is changed between the widthwise both ends and the center by changing the direction of the unpressed portion with respect to the pressed portion during pressing.   The tire manufacturing method according to claim 1, wherein the direction of the unpressed portion relative to the pressed portion is changed by controlling an approach angle of the unpressed portion to the peripheral surface of the expansion / contraction core body.   The tire manufacturing method according to claim 1 or 2, wherein a belt strip made of a single steel cord with rubber is stuck on the expansion / contraction core body to form the belt.   When forming a plurality of types of belts including two different belt circumferences when forming the belt, a belt strip made of a plurality of cords with rubber is used, and the minimum inclination angle with respect to the circumferential direction of the steel cord at the time of belt formation is α The width of the belt strip is defined as a value obtained by adding or subtracting a predetermined adjustment allowance to a common divisor for a collection of products of the belt circumference and sin α obtained for each type of belt. The manufacturing method of the tire of description.   5. The continuous belt strip is formed by covering the steel cord unrolled from the cord reel with rubber in parallel with the application of the continuous belt strip onto the expansion / contraction core body at the tip portion. The manufacturing method of the tire in any one of.   After the carcass band is pasted on the circumference of the expanded core body that has been reduced in diameter, both sides of the center part of the carcass band are locked with bead cores, the diameter of the expanded core body is increased, and the center part of the carcass band that is bulged by the expanded core body The tire manufacturing method according to claim 1, wherein the belt is formed on a circumference. A belt forming apparatus used in the tire manufacturing method according to claim 1,
A strip applicator comprising a strip applicator for cutting the predetermined length portion of the continuous belt strip and adhering it onto the expansion / contraction core body, and an applicator control means for displacing the strip applicator in the axial direction of the expansion / contraction core body. A pressing roller for pressing a predetermined length portion of the belt strip against the expansion / contraction core body, and a cutter for cutting the predetermined length portion of the continuous belt strip,
Displacement of the pressing roller disposed in the strip applicator is synchronized with the rotational speed of the expansion / contraction core body so that the inclination angle of the steel cord changes at both ends and the center in the tire width direction. A belt forming apparatus configured to control the speed, the direction of the pressing roller with respect to the circumferential direction of the expansion / contraction core body, and the direction in which the belt strip enters the pressing roller. A relay drum that feeds one or more steel cords from a cord reel and sends the belt strip to a strip applicator; a rubber coating machine that continuously coats the steel cord with rubber between the cord reel and the relay drum; and The belt forming apparatus according to claim 7, further comprising a continuous strip forming means having a bell and a festoon for adjusting excess or deficiency of the strip generated between the strip applicator and the relay drum.

Images