JP5977494B2 - End face joining method and joining apparatus for carcass ply material for pneumatic tire - Google Patents

Description

  The present invention wraps a carcass ply material over its entire length on the outer peripheral surface of a molding drum that can be deformed to expand and contract, and connects both end surfaces of the carcass ply material on the winding start end side and winding end side to each other. The present invention relates to an end face joining method and apparatus for a carcass ply material for a pneumatic tire to be butt joined to each other, and particularly proposes a technique capable of realizing highly efficient and highly accurate end face joining.

  As a method of joining the carcass ply material for the pneumatic tire, there is a so-called butt joint joining method in which the end surface on the start end side and the end surface on the end side of the carcass ply material are butted together.

  However, when the molding of the inner liner material and the butt joint of the carcass ply material are performed on the same molding drum, the inner peripheral surface of the carcass ply material sticks to the outer peripheral surface of the inner liner that is pre-molded on the molding drum. Therefore, in order to butt-join the end faces of the carcass ply material, it is necessary to peel off the carcass ply material that is wound around the inner liner material and then perform end-face butt joining. The decline in efficiency could not be denied.

  Therefore, conventionally, a method of performing butt joining of the end faces of the carcass ply material on a dedicated molding drum is common.

  For example, in Patent Document 1, “a molding drum capable of expanding and contracting diameter is formed so that a slot opening across the entire width of the molding drum is formed on the surface of the molding drum when the diameter is expanded without being partially closed in the circumferential direction. The first arm and the second arm parallel to the drum axis are formed outwardly on one side of the slot opening, the tip of the first arm is radially outward of the slot opening, and the tip of the second arm is the groove. The inner side in the radial direction of the hole opening is provided so as to be able to advance and retreat in parallel with the opening of the groove hole, and two roll holders arranged in the width direction are provided at the tip of the first arm and the tip of the second arm, respectively. A pair of joint rolls arranged in the circumferential direction of the molding drum, respectively, such that the joint roll of the first arm and the joint roll of the second arm face each other in the radial direction of the molding drum, and the width of the molding drum “A steel ply joining apparatus for radial tires, wherein the joint rolls on the opposite side and the other side are provided so as to alternately sandwich the portions of the steel ply wound around the forming drum and straddling the slot opening”. Have been described.

  In this joining apparatus, “the back surface of the both ends butted portion of the steel ply does not come into contact with the surface of the forming drum, but when the joint roll is moved outward from the center of the drum width as described above, The part of the steel ply on the opposite half away from the both-ends abuts against the forming drum, and a frictional force acts. This frictional force opposes the tension associated with the movement of the joint roll. And, since the joint roll is in contact with both the front and back surfaces of the steel ply, the abutting portions at both ends of the steel ply are securely bonded to each other. ”Is bonded to both the front and back surfaces reliably, and the bonding strength is improved.” Can be bonded of the steel ply efficiently by setting the optimum angle the inclination angle of the support shaft with respect to the running direction in a joint roll of the roll and the other side. A. "

  However, in the above-described joining device, it is necessary to roll each joint roll over the entire length of the butt portion at both ends of the steel ply, so that joining takes time and high productivity cannot be obtained. There's a problem.

  Moreover, as an end surface joining device for a belt-shaped member such as a carcass ply material for a pneumatic tire, for example, Patent Document 2 discloses that “having a plurality of first belts that are separated in the width direction of the belt-shaped member and extend in the longitudinal direction. A first conveyor capable of expanding and contracting in the longitudinal direction of the belt-like member, and a plurality of belts installed in front of the first conveyor and spaced apart in the width direction of the belt-like member while being alternately positioned with the first belt and extending in the longitudinal direction The second belt can be expanded and contracted in the longitudinal direction of the belt-like member, and when the first and second conveyors both extend and come closest to each other, the second belt is interposed between the front end portions of the first belt. When the rear end of the second conveyor and the first conveyor and the second conveyor are alternately inserted into the second conveyor, the rear end portion is raised and protrudes upward from the first and second conveyors. Strip A plurality of vertically extending positioning pins that determine the position of the band-shaped member by abutting the front end of the material and the rear end of the band-shaped member on the second conveyor, and a vertically movable upper joint claw installed above the positioning pin And the upper end of the belt-like member on the first conveyor and the rear end of the belt-like member on the second conveyor in cooperation with the upper joint claw that has been lowered when installed. And a lower joining claw that joins the end face joining device for a belt-like member, ”.

  According to this, “first and second conveyors (27) and (33) are operated, and the belt-like member (T) on the first belt (25) is moved forward until the front end strongly hits the positioning pin (38)”. Further, the belt-shaped member (T) on the second belt (31) is conveyed rearward until the rear end strongly hits the positioning pin (38), and is bent to the front and rear end portions of the belt-shaped member (T). As a result, the posture is corrected so that the front and rear ends of these belt-like members (T) are substantially parallel to each other, and the distance between them is also set to be constant. " "The front and rear ends of the belt-shaped member can be joined with high efficiency and high accuracy."

  However, in the end face bonding apparatus for a band-shaped member as described above, each end surface of two or more band-shaped members is bonded to form a longer band-shaped member. Depending on the end surface bonding apparatus, one band-shaped member may be used. It is impossible to wind and form a cylindrical member.

  Further, in the above apparatus, a conveyor for transporting each belt-like member to abut against the positioning pin is necessary, but such a conveyor is not incorporated into a molding drum for a carcass ply material for a pneumatic tire. It is difficult, and even if it is incorporated temporarily, each control becomes complicated. Therefore, it is usual to apply the joining apparatus described in Patent Document 2 to joining carcass ply materials for pneumatic tires. It is impossible.

JP 7-276530 A JP-A-6-198745

  Then, an object of this invention is to provide the end surface joining method and joining apparatus of the carcass ply raw material for pneumatic tires which can implement | achieve highly efficient and highly accurate end surface joining.

The gist configuration of the present invention for solving the above problems is as follows.
The method for joining the end faces of the carcass ply material for a pneumatic tire according to the present invention includes winding the carcass ply material over the entire length on the outer peripheral surface of a molding drum capable of expanding and contracting the diameter, and starting the winding of the carcass ply material. A carcass ply material end face joining method for a pneumatic tire, wherein both end faces of the side and the winding end side are butted and joined to each other,
The end portion on the winding start end side of the carcass ply material is adsorbed by one suction means of the molding drum to rotate and displace the molding drum, and the end portion on the winding end side of the carcass ply material is , By adsorbing to the other adsorption means of the molding drum, the carcass ply material is wound on the outer peripheral surface of the molding drum over its entire length,
The abutting means located between the two suction means of the molding drum deforms the molding drum in a diameter-reduced manner and moves the one and the other suction means closer to each other under the attitude of outward movement in the drum radial direction. By causing the end portions of the carcass ply material adsorbed by the one and the other adsorbing means to approach each other, the portions other than the end portions of the carcass ply material at the beginning and end While maintaining the state of being tightly wound around the molding drum, only the portion between the portions of the end portions of the carcass ply material at the beginning and end of the carcass ply material respectively adsorbed by the one and the other adsorbing means , After concentrating the excess of the carcass ply material and forming a bent portion that protrudes radially outward,
With the abutting means retracted radially inward, the outer pulling claw and the inner pulling claw are engaged with the outer surface and the inner surface of the flexible portion, respectively, and the outer pulling claw is engaged. Each end face of the carcass ply material is joined to each of the end faces of the carcass ply material by operating each of the close claws and the inner attracting claws.

  Here, examples of the “adsorption means” include those using negative pressure suction or magnetic force, but those using negative pressure suction are preferably used.

  Further, here, the inner pulling pawl and the outer pulling pawl are configured by arranging a plurality of pawl members alternately arranged on the left and right sides in the drum axis direction, and when the pulling pawl is closed, It is preferable to use one in which the claw members enter and displace each other.

An end surface joining apparatus for a carcass ply material for a pneumatic tire according to the present invention winds a carcass ply material over the entire length on an outer peripheral surface of a molding drum capable of expanding and contracting diameter, and starts winding the carcass ply material. A carcass ply material end face joining device for a pneumatic tire that butt-joins and joins both end faces of the side and the winding end side,
The inner pulling claw located on the inner side in the drum radial direction from the outer peripheral surface of the molding drum and the abutting means arranged on the inner side in the drum radial direction from the outer peripheral surface of the molding drum can be advanced outward in the drum radial direction. a molding drum having a one and the other suction means for position abutting advancing means, and, in the drum circumferential direction on both sides of the projecting-out against advancing means,
In cooperation with the inner pulling nail, an outer pulling nail capable of joining the end faces of the carcass ply material at the beginning and end ,
The ingredients example,
The one and the other adsorbing means are each of the end portions of the carcass ply material at the beginning and end of the molding drum at the time of the diameter-reducing deformation of the abutting means in an outwardly extending attitude of the abutting means. When the one and the other adsorbing means come close to each other while adsorbing each other, the respective end portions of the adsorbed carcass ply material are brought close to each other, and the carcass ply material starts and ends. Each of the end portions of the carcass ply material is adsorbed by the one and the other adsorbing means while maintaining the portions other than the end portions in a state of being tightly wound around the molding drum. The surplus portion of the carcass ply material is concentrated only in a portion between the portions, and a bent portion that protrudes radially outward is formed .

  Preferably, in this apparatus, each of the adsorbing means adsorbs the respective end portions of the carcass ply material on the winding start end side and the winding end side by negative pressure suction.

  Preferably, each of the inner and outer pulling claws is composed of a plurality of claw members arranged alternately on the left and right in the drum axis direction, and when the pulling claw is closed, It is assumed that the claw members enter each other and are displaced.

  According to the joining method of the carcass ply material for a pneumatic tire of the present invention, in particular, the respective end portions of the carcass ply material are adsorbed to the respective adsorption means of the molding drum, and the carcass ply material is applied to the molding drum. After winding, the abutting means located between the two adsorbing means is deformed to reduce the diameter of the molding drum in the advancing posture outward in the drum radial direction, and the end faces of the carcass ply material are brought into contact with each other. By contacting the side surface of the means and forming a bent portion that protrudes outward in the radial direction at the beginning and end portions of the carcass ply material, the conveyor can be made like a conventional “end surface joining device for belt-like members”. Without using it, the end faces of the carcass ply material can be quickly aligned on the molding drum.

  Further, in this method, since the end faces of the carcass ply material can be aligned on the molding drum, these end faces can be easily butt-joined by the inner and outer attracting claws. Therefore, in this end surface joining method, it is not necessary to roll each joint roll over the entire length of the butt portion of the carcass ply material as in the conventional “steel ply joining device”. In addition, highly accurate joining can be realized.

  According to the end face joining device for carcass ply material for a pneumatic tire of the present invention, in particular, the inner drawing claw located on the inner side in the drum radial direction from the outer peripheral surface of the molding drum, the drum diameter from the outer peripheral surface of the molding drum The abutting means arranged on the inner side in the direction is abutting advancing means capable of advancing outward in the drum radial direction, and each of the abutting advancing means is located on both sides of the drum circumferential direction and can adsorb the carcass ply material. The pneumatic drum of the present invention comprises a molding drum having a suction means and an outer drawing claw capable of joining the end faces of the carcass ply material in cooperation with the inner drawing claw. The end face joining method of the carcass ply material can be easily carried out, and the effect obtained by this method can be obtained.

  In the end surface joining method and joining apparatus for carcass ply materials for pneumatic tires of the present invention, when each suction means of the molding drum is to suck and suck the carcass ply material, these suction means However, since it is adsorbed to each end portion of the carcass ply material by negative pressure suction, the above method and apparatus can be applied to a carcass ply material that does not include a steel cord.

  In the end face joining method and joining apparatus described above, a plurality of claw members are alternately arranged in the left-right direction in the drum axial direction as the inner drawing claw and the outer drawing claw, and the closing claw of the drawing claw is closed. Sometimes, when using the pulling claws that the left and right claw members enter and displace each other, when the end faces of the carcass ply material are joined, the plurality of claw members evenly bite into the surfaces of both ends of the carcass ply material, Since these end portions are attracted to each other, both end surfaces are evenly pressed together over the entire length in the drum axis direction, and the area of these joints increases, resulting in higher precision and stronger joining. Can be obtained.

1 is a side view schematically showing a carcass ply material joining apparatus according to an embodiment of the present invention and a carcass ply material in which an end portion on a winding start end side is adsorbed by one adsorbing means of a molding drum. FIG. 2 is a side view schematically showing the joining apparatus of FIG. 1 and the carcass ply material in the middle of winding the carcass ply material around the molding drum while rotating the molding drum. FIG. 2 is a side view schematically showing the joining apparatus of FIG. 1 and a carcass ply material in which each of the winding start end side and end side end portions is adsorbed by the adsorbing means of the molding drum. (A)-(c) is explanatory drawing which shows the process of joining each end surface of the carcass ply raw material in the joining method of the carcass ply raw material which can be performed using the joining apparatus of FIG. (A) is a partial enlarged plan view of a molding drum schematically showing an example of an inner drawing claw at the time of opening, and (b) is a schematic diagram showing an example of an inner drawing claw at the time of closing. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3, a joining apparatus 1 for a carcass ply material 3 for a pneumatic tire winds the carcass ply material 3 over its entire length on the outer peripheral surface of a molding drum 2 that can be deformed to expand and contract, and This is for butt-joining both end surfaces 3c, 3d of the material 3 on the winding start end side and the winding end side.

Here, in the end surface joining device 1 for the carcass ply material 3 of the pneumatic tire according to the present invention, the inner attracting claw 7 positioned on the inner side in the drum radial direction from the outer peripheral surface of the molding drum 2,
The abutting means 5a that can be advanced toward the outer side in the drum radial direction with the abutting means 5a disposed on the inner side in the drum radial direction from the outer peripheral surface of the molding drum 2, and the drum circumferential direction of the abutting advancing means 5 The end surfaces 3c and 3d of the carcass ply material 3 are arranged on both sides in cooperation with the molding drum 2 having the respective suction means 4a and 4b capable of sucking the carcass ply material 3 and the inner attracting claw 7. It is important to have the outer pulling claws 6 that can be joined together.

In the illustrated example, the respective suction means 4 a and 4 b are arranged on both sides of the inner pulling claw 7 in the drum circumferential direction, respectively, and the swing plates 4 c and 4 c forming a part of the outer peripheral surface of the molding drum 2. 4d and a plurality of suction pads 4e, 4f arranged in the swinging plate 4c, 4d in an exposed posture on the outer surface thereof, for example, spaced about 50 mm apart from each other in the drum axial direction. I have it.
Further, the abutment means 5a of the abutment advance means 5 is, for example, a plurality of pins that are provided at a predetermined interval in the axial direction of the molding drum 2 and can be moved forward and backward in the drum radial direction. be able to. 1 and 2, the abutting means 5a is in a receding posture with respect to the outer peripheral surface of the molding drum, and in the position shown in FIG. 3, it is in an advancing posture protruding from the outer peripheral surface of the molding drum. Yes.

  Each of the adsorbing means 4a, 4b, the abutting means 5a, the abutting advance means 5, the outer attracting claw 6, and the inner attracting claw 7 are all continuous or intermittent over the entire axial width of the molding drum 2. It is preferable that it is arranged. According to this, the respective functions of the suction means 4a, 4b, the abutting means 5a, the abutting advance means 5, the outer attracting claw 6 and the inner attracting claw 7 increase the width of the molding drum 2 in the axial direction. Since it acts uniformly over the entire width of the carcass ply material 3 having various widths within a range not exceeding, it is possible to perform end face joining with higher accuracy and efficiency.

  The end surface joining method of the carcass ply material for a pneumatic tire of the present invention can be carried out using the end face joining device as described above, and an example of this end surface joining method is described below with reference to FIGS. Detailed explanation.

  In FIG. 1, the end portion 3 a on the winding start end side of the carcass ply material 3 is adsorbed to one adsorbing means 4 a of the molding drum 2. At that time, as shown in FIG. 1, the end surface 3c on the start end side of the carcass ply material 3 faces the other suction means 4b.

  In addition, it is preferable that the carcass ply material 3 is cut into a required length by a predetermined cutting machine (not shown) or the like according to, for example, a tire size. The size of the molding drum 2 can be selected according to the length of the cut carcass ply material 3 and the like.

  From the state shown in FIG. 1, the molding drum 2 is turned and displaced in the direction (the counterclockwise direction in the illustrated example) toward the end surface 3c on the start end side of the carcass ply material 3, so that as shown in FIG. The ply material 3 is sequentially wound around the molding drum 2. When the molding drum 2 is further rotated and displaced in the same direction and rotated about one turn, the end portion 3b on the terminal side of the carcass ply material 3 is adsorbed to the other adsorption means 4b of the molding drum 2 as shown in FIG. Let

  Thereby, as shown in FIG. 3, the carcass ply material 3 is wound around the molding drum 2 over the entire circumference thereof, and the end faces 3c and 3d of the carcass ply material 3 are sandwiched between the butting and advancing means 5. It will be in the state of generally facing.

  Here, the abutting means 5a is set in the advanced posture as shown in FIG. 3, and the molding drum 2 is further reduced in diameter under this advanced posture, so that the suction means 4a and 4b are shaken along with the reduced diameter deformation. The moving plates 4c and 4d approach each other together with the respective end portions 3a and 3b adsorbed on the outer surfaces of the swing plates 4c and 4d by the negative pressure suction of the adsorbing pads 4e and 4f. The substantially cylindrical carcass ply material 3 wound around the surface is also reduced in diameter, and the surplus length of the carcass ply material 3 is a substantial gap in the outer peripheral surface of the molding drum 2. It will concentrate most in the nearby space.

  Due to the concentration of the surplus portion, the end faces 3c and 3d of the carcass ply material 3 are located close to the abutting means 5a as shown in the enlarged view of FIG. The side portions of the means 5a are brought into contact with each other, and the end portions 3a and 3b at the beginning and end of the carcass ply material are formed with bent portions 8 that protrude outward in the radial direction.

  In the end surface joining method of the carcass ply material for the pneumatic tire of the present invention, in particular, the both end surfaces 3c and 3d of the carcass ply material 3 are brought close to each other by utilizing the action of the expansion and contraction diameter deformation of the molding drum 2. One feature is that the bending portion 8 as described above is formed by utilizing the surplus portion of the carcass ply material 3 generated by the diameter reduction deformation of the molding drum 2.

  By forming such a bent portion 8, the end faces 3 c and 3 d approach each other over the entire width of the carcass ply material 3, so that an error in cutting or winding the carcass ply material 3, etc. The error of the distance between both end faces 3c and 3d due to is instantaneously reset.

  Next, as shown in FIG. 4 (b), the abutting means 5a is set in the radially inward receding posture, and the outer attracting claw 6 is lowered as shown by a white arrow in the figure. The outer drawing claw 6 and the inner drawing claw 7 are engaged with the outer surface and the inner surface of the bending portion 8 respectively.

Thereafter, as shown in an exaggerated manner in FIG. 4C, the outer pulling claw 6 having a plurality of claw members 6a hinged so as to be able to swing is similarly provided with a swingable claw member 7a. By further lowering toward the inner drawing claw 7, the claw members 6a, 7a are oscillated and displaced around the hinge pins as indicated by arrows in the figure, so that the carcass ply material 3 is drawn outward. The end faces 3c and 3d of each end sandwiched between the claw 6 and the inner drawing claw 7 are firmly pressed against each other.
Thereby, these start end surfaces 3c and end surface 3d can be butt-joined with high precision.

For example, as shown in the enlarged plan view of the molding drum in FIGS. 5 (a) and 5 (b), such an inner drawing claw 7 is attached so as to be swingable in a direction in which the left and right sides approach and separate from each other. Thus, it is preferable that a plurality of claw members 7a having a plurality of grooves formed on the contact surface with the carcass ply material 3 are alternately arranged on the left and right in the drum axis direction (vertical direction in the figure).
For the sake of explanation, the inner drawing claw 7 is illustrated in FIG. 5, but the outer drawing claw 6 can also be configured in the same manner.

  Here, normally, as the width W of the claw member 7a is reduced and the number of the claw members 7a disposed in the drum axis direction is increased, a more uniform and highly accurate end face joining can be obtained. In consideration of various circumstances such as the influence of biting into the carcass ply material 3, the width W is preferably in the range of about 2 to 6 mm.

  Through the above steps, both end surfaces 3c and 3d of the carcass ply material 3 can be butted and joined efficiently and with high accuracy, thereby forming a cylindrical carcass ply for a pneumatic tire.

  In the end face joining method and apparatus for a carcass ply material for a pneumatic tire according to the present invention, for example, the abutment means 5a, the outer attracting claw 6, the inner attracting claw 7, and the like can be temperature controlled. .

  According to this, both the end portions 3a, 3b or the end faces 3c, 3d of the carcass ply material 3 are brought into contact with each other by bringing the abutting means 5a, the outer attracting claw 6 and the inner attracting claw 7 into a high temperature state. Since the surfaces 3c and 3d are heated and they are easily bonded to each other, the efficiency and adhesion strength of end surface bonding can be further improved.

  The carcass ply on the molding drum 2 formed by the above method and apparatus is then transported to the next manufacturing process by a predetermined transport device (not shown) or the like, for example, molded on the inner liner molding drum. The inner liner can be attached from the radially outer side of the inner liner. Thus, the carcass ply can be integrated with the inner liner.

  Alternatively, the carcass ply formed on the molding drum 2 by the above method and apparatus is formed into an arc shape by joining the end surfaces by the same method and apparatus, and is attached to the conveying device and is more than the molding drum 2. By inserting the molding drum 2 together with the other carcass ply having a larger diameter from the inner side in the radial direction of the other carcass ply, the carcass ply on the molding drum 2 is brought into the inner side in the radial direction of the other carcass ply. By arranging and further expanding the diameter of the molding drum 2 from this state, the diameter of the carcass ply on the molding drum 2 is expanded and adhered to the inner peripheral surface of another carcass ply.

  As a result, the carcass ply on the molding drum 2 can be integrated with other carcass plies to easily form a carcass member composed of a plurality of layers of carcass plies.

DESCRIPTION OF SYMBOLS 1 End surface joining apparatus 2 of carcass ply material 2 Forming drum 3 Carcass ply material 3a End part 3b of winding start end side End part 3c of winding end side End face 3d of winding start end side End face 4a of winding end side Adsorption means (winding) (Starting side)
4b Adsorption means (winding end side)
4c, 4d Oscillating plates 4e, 4f Suction pad 5 Abutting advance means 5a Abutting means 6 Outer attracting claw 6a Claw member 7 Inner attracting claw 7a Claw member 8 Deflection part

Claims (6)

Air that wraps the carcass ply material over the entire length of the outer peripheral surface of the molding drum capable of expanding and contracting diameter, and butt-joins both end surfaces of the carcass ply material on the winding start end side and winding end side. A method for joining end surfaces of carcass ply materials for tires,
The end portion on the winding start end side of the carcass ply material is adsorbed by one suction means of the molding drum to rotate and displace the molding drum, and the end portion on the winding end side of the carcass ply material is , By adsorbing to the other adsorption means of the molding drum, the carcass ply material is wound on the outer peripheral surface of the molding drum over its entire length,
The abutting means located between the two suction means of the molding drum deforms the molding drum in a diameter-reduced manner and moves the one and the other suction means closer to each other under the attitude of outward movement in the drum radial direction. By causing the end portions of the carcass ply material adsorbed by the one and the other adsorbing means to approach each other, the portions other than the end portions of the carcass ply material at the beginning and end While maintaining the state of being tightly wound around the molding drum, only the portion between the portions of the end portions of the carcass ply material at the beginning and end of the carcass ply material respectively adsorbed by the one and the other adsorbing means , After concentrating the excess of the carcass ply material and forming a bent portion that protrudes radially outward,
With the abutting means retracted radially inward, the outer pulling claw and the inner pulling claw are engaged with the outer surface and the inner surface of the flexible portion, respectively, and the outer pulling claw is engaged. An end surface joining method for a carcass ply material for a pneumatic tire, wherein each of the end surfaces of the carcass ply material is joined by operating each of the gathering claws and the inner drawing claws.   The end surface joining method of a carcass ply material for a pneumatic tire according to claim 1, wherein each of the end portions of the carcass ply material is sucked and sucked by a negative pressure by each suction means of the molding drum.   A plurality of claw members are alternately arranged on the left and right sides in the drum axial direction as the inner drawing claw and the outer drawing claw, and when the drawing claw is closed, the left and right claw members are mutually connected. The end surface joining method of the carcass ply material for a pneumatic tire according to claim 1 or 2, wherein a pulling claw that enters and displaces is used. Air that winds the carcass ply material over the entire length of the outer peripheral surface of the molding drum capable of expanding and contracting diameter, and butt-joins both ends of the carcass ply material on the winding start end side and winding end side. An end surface joining device for carcass ply material for tires,
The inner pulling claw located on the inner side in the drum radial direction from the outer peripheral surface of the molding drum and the abutting means arranged on the inner side in the drum radial direction from the outer peripheral surface of the molding drum can be advanced outward in the drum radial direction. a molding drum having a one and the other suction means for position abutting advancing means, and, in the drum circumferential direction on both sides of the projecting-out against advancing means,
In cooperation with the inner pulling nail, an outer pulling nail capable of joining the end faces of the carcass ply material at the beginning and end ,
The ingredients example,
The one and the other adsorbing means are each of the end portions of the carcass ply material at the beginning and end of the molding drum at the time of the diameter-reducing deformation of the abutting means in an outwardly extending attitude of the abutting means. When the one and the other adsorbing means come close to each other while adsorbing each other, the respective end portions of the adsorbed carcass ply material are brought close to each other, and the carcass ply material starts and ends. Each of the end portions of the carcass ply material is adsorbed by the one and the other adsorbing means while maintaining the portions other than the end portions in a state of being tightly wound around the molding drum. only the portion between of the points in said by concentrating the excess of the carcass ply material to form the flexible portion is convex radially outward, pneumatic tire End surface bonding apparatus of the carcass ply material.   The carcass for a pneumatic tire according to claim 4, wherein each of the adsorbing means is configured to adsorb and adsorb the respective end portions of the carcass ply material at the winding start end side and the winding end end side under negative pressure. End face joining device for ply material.   Each of the inner drawing claw and the outer drawing claw is composed of a plurality of claw members arranged alternately on the left and right sides in the drum axis direction, and when the drawing claw is closed, the left and right claw members are mutually connected. The end face joining device for carcass ply material for a pneumatic tire according to claim 4 or 5, wherein the end face joining device is adapted to be displaced.

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