JP2007038581A - Method and device for joining rubber sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining method and a joining device, which make rubber sheets with uniform thickness and quality butt-joined together, while preventing the swell of joints at both ends of the rubber sheet. <P>SOLUTION: The joining device comprises a molding drum 17, the diameter of which can be enlarged/reduced, and a movable member 52 which can advance/retreat in the radial direction of the molding drum with respect to the molding drum. In the molding drum, first and second holding parts 45b and 46b for holding both the ends of the rubber sheet 15, respectively, are each provided movably in the radial direction of the molding drum. In the movable member 52, first and second pressing parts 57b and 58b for pressing both the ends of the rubber sheet against the first and second holding parts, respectively, are provided in such a manner as to be relatively movable in the tangential direction of the molding drum. Intermeshing parts 45a and 46a meshing with each other in such a manner as to be capable of overlapping each other are formed in the first and second holding parts, respectively, and intermeshing parts 57a and 58a meshing with each other in such a manner as to be capable of overlapping each other are formed in the first and second pressing parts, respectively. A synchronous movement means, which relatively moves the first and second pressing parts in the tangential direction of the molding drum in synchronization with the relative movement of the first and second holding parts in the tangential direction of the molding drum, is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a joining method and joining apparatus for joining both ends of a rubber sheet wound around the outer periphery of a forming drum by butt joining, and more particularly to a rubber sheet joining method and joining apparatus that do not generate a raised portion at the joining end. .

  As what butt-joins the both-ends joint part of unvulcanized belt-like materials, such as a carcass ply used as a tire constituent material, on a molding drum, the thing of patent document 1 is known, for example. The one described in Patent Document 1 is affixed to a forming drum whose joint is in an open state by affixing a joining terminal portion of a band-shaped material that has been cut in advance and pulling the joining terminal portion together by closing the forming drum. Temporary joining is performed, and in this state, the joining terminal portion is crimped by a pair of bevel-shaped rollers.

In the thing of above-mentioned patent document 1, in order to join the joining terminal part of a strip | belt-shaped material approaching with an umbrella-shaped roller, a joining terminal part swells inevitably, and the flatness of a joining terminal part worsens. . Therefore, in order to level the swell of the joining terminal part, after joining the joining terminal part of the band-shaped material, as described in Patent Document 2, for example, the joining terminal part is provided by a leveling plate provided with heating means. It is necessary to increase the flatness of the joining terminal portion by adding a leveling process of pressing the clamp from above and below.
JP 2002-11805 (paragraphs 0018 to 0020, FIG. 1) JP 2004-142219 A (paragraphs 0027 to 0031, FIG. 1)

  Thus, in the thing of patent document 1, in order to level | rise the swelling of a junction part, as described in patent document 2, a rubber is chemically denatured with the leveling board which provided the heating means. Therefore, it is necessary to obtain flatness, so that the joint portion and other portions of the sheet are different in quality even if they are the same in thickness. Therefore, when a tire is manufactured using a carcass ply joined by such a joining method, uneven portions having different physical properties exist on the circumference of the tire, which hinders quality improvement. There is a fear. Moreover, there is a problem that the equipment cost increases due to the addition of the leveling process, and the cycle time of tire manufacture becomes long.

  The present invention has been made in order to solve the above-described conventional problems, and a joining method for butt-joining rubber sheets having a uniform thickness and quality without bulging both end joining portions of the rubber sheet And it aims at providing a joining device.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a joining method in which both ends of a rubber sheet wound around the outer periphery of a forming drum are joined by butt joining, and are provided on the forming drum and overlap each other. A first and a second holding portion that mesh with each other in a state, and a first and a second pressing portion that are provided on a movable member that can move toward and away from the molding drum in the radial direction of the molding drum and mesh with each other in an overlapping state. The rubber sheet is sandwiched between both end portions, and the rubber sheet is sandwiched between the first and second holding portions and the first and second pressing portions. The both end portions of the rubber sheet are butt-joined by moving the first and second holding portions and the first and second pressing portions relative to each other in the tangential direction of the molding drum. A rubber sheet joining method according to claim and.

  According to a second aspect of the present invention, there is provided a joining apparatus for joining both ends of a rubber sheet wound around an outer periphery of a forming drum by butt joining, a forming drum capable of expanding and contracting a drum diameter, and a forming drum with respect to the forming drum. A movable member capable of moving back and forth in the radial direction, and the molding drum is provided with first and second holding portions that respectively hold both end portions of the rubber sheet movably in the radial direction of the molding drum, The movable member is provided with first and second pressing portions that press both end portions of the rubber sheet against the first and second holding portions, respectively, so as to be relatively movable in a tangential direction of the molding drum. The first and second holding portions and the first and second pressing portions are formed with meshing portions that mesh with each other so as to overlap each other. A rubber sheet joining apparatus characterized in that a synchronous movement means tangential synchronization with the relative movement relatively moves the first and second pressing portion in the tangential direction of the forming drum arm.

  According to a third aspect of the present invention, in the second aspect of the present invention, in the first and second holding portions and the surfaces of the first and second pressing portions that are in contact with the rubber sheets, rubber sheets are disposed on the first and second portions. This is a rubber sheet joining apparatus in which wavy claws that bite into the rubber sheet are formed so as not to retreat with respect to the holding portion and the first and second pressing portions.

  According to a fourth aspect of the present invention, in the second or third aspect, the synchronous movement means includes a first engagement member provided in each of the first and second holding portions, and the first and second And a second engaging member that can be engaged with and disengaged from the first engaging member by advancing and retreating the movable member.

  According to the first aspect of the present invention configured as described above, the first and second holding portions provided in the overlapping state and provided in the molding drum, and the overlapping state provided in the movable member. Both ends of the rubber sheet are sandwiched between the engaging first and second pressing portions, and the first and second holding portions and the first and second pressing portions are tangent to the molding drum in this state. Since both ends of the rubber sheet are butt-joined by moving in the direction, it is possible to press both ends of the rubber sheet while holding both ends of the rubber sheet. Even if both ends are joined with a strong pressure contact force, it is possible to prevent the swell from occurring in the joined portion. This eliminates the need for a leveling process to level the raised parts after joining the rubber sheets, facilitating a rubber sheet joining method that can efficiently produce a rubber sheet with uniform thickness, excellent flatness, and uniform quality. Can get to.

  According to the second aspect of the present invention, the first and second holding portions provided on the molding drum to be movable in the radial direction of the molding drum and the movable member are provided to be relatively movable in the tangential direction of the molding drum. The first and second pressing portions that press both end portions of the rubber sheet against the first and second holding portions are formed with meshing portions that mesh with each other so as to overlap each other, and these first and second holding portions Since the synchronous movement means for synchronously moving the portion and the first and second pressing portions relative to each other in the tangential direction of the forming drum is provided, the both ends of the rubber sheet are held between the holding portion and the pressing portion, The first and second holding parts and the first and second pressing parts can be relatively moved synchronously, thereby joining both ends of the rubber sheet easily and reliably without causing the joints to rise. so Rubber sheet joining apparatus can be obtained that.

  According to the invention of claim 3, since the wavy claws that bite into the rubber sheet are formed on the surfaces of the first and second holding portions and the first and second pressing portions that are in contact with the rubber sheet, The rubber sheet can be reliably bonded with a sufficient pressure contact force.

  According to the fourth aspect of the present invention, the synchronous movement means includes a first engagement member provided in each of the first and second holding portions, and a movable member provided in each of the first and second pressing portions. Since the second engaging member can be engaged with and disengaged from the first engaging member by advancing and retreating, the first and second engaging members can be engaged and disengaged by advancing and retreating the movable member. Configuration can be simplified

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The rubber sheet joining method and joining apparatus in the present invention are suitable for application to the manufacture of carcass plies used for automobile tires, but the scope of application is not particularly limited.

  FIG. 1 schematically shows an overall configuration of a manufacturing apparatus 10 for manufacturing a rubber sheet such as a carcass ply. The manufacturing apparatus 10 mainly includes a rubber sheet transport apparatus 11 for transporting a cord-reinforced rubber sheet 15 serving as a carcass ply. And a rubber sheet winding device 12 that winds the rubber sheet 15 around the outer periphery of the molding drum 17, and a rubber sheet bonding device 13 that bonds both ends of the rubber sheet 15.

  As shown in FIG. 2, the rubber sheet conveying device 11 is supported by a pair of rails 22 that are horizontally installed on a fixed frame 21 and supported by a pair of rails 22 so as to be movable up and down on the conveying table 23. The rubber sheet 15 is supported on the support base 24. The rubber sheet 15 is obtained by cutting an unvulcanized belt-like rubber having a predetermined width wound around a bobbin (not shown) into a predetermined length according to the type and size of the tire.

  The rubber sheet winding device 12 rotatably supports a molding drum 17 having a configuration described later. The support base 24 supporting the rubber sheet 15 is transported together with the transport base 23, and the support base 24 is moved by the lifting cylinder 25 in a state where one end (winding end portion) 15 a of the rubber sheet 15 is positioned below the molding drum 17. When raised, the winding start end 15 a of the rubber sheet 15 is brought into contact with the outer periphery of the molding drum 17. In synchronization with the rotation of the forming drum 17 in this state, the rubber sheet conveying device 11 moves forward, whereby the rubber sheet 15 is wound around the outer periphery of the forming drum 17 by one turn. The winding start end portion 15a and the winding end end portion 15b are opposed to each other with a slight gap.

  Next, the configuration of the forming drum 17 will be described with reference to FIG. The forming drum 17 includes a shaft cylinder 30 and a pair of disk-shaped disks 31 a and 31 b fixed to both ends of the shaft cylinder 30. The shaft cylinder 30 is rotatably supported by the rubber sheet winding device 12, and is rotated by a predetermined angle by a rotation driving means (not shown).

  A plurality of segments 33 are supported between the pair of disks 31a and 31b so as to be movable in the radial direction at equal circumferential intervals. Brackets 34a and 34b are attached to the inner surface of each segment 33 at both ends in the axial direction, and these brackets 34a and 34b can move radially to the inner surfaces of the disks 31a and 31b via guide members 35a and 35b, respectively. Is supported by guidance. A cylindrical drum diameter changing member 36 is fitted and supported on the outer periphery of the shaft cylinder 30 so as to be relatively movable in the axial direction, and an inclined cam inclined at a predetermined angle with respect to the axial direction is provided on both outer ends of the drum diameter changing member 36. Members 37a and 37b are provided. Brackets 34a and 34b attached to the inner surface of each segment 33 are guided and supported by the inclined cam members 37a and 37b via guide members 38a and 38b.

  An adjustment shaft 40 is rotatably inserted into and supported in the shaft tube 30 and is rotated by a rotation driving means (not shown). A ball screw 41 is rotatably supported in the shaft cylinder 30, and the ball screw 41 is connected to the inner end of the adjustment shaft 40. A nut 42 is screwed onto the ball screw 41, and the nut 42 is connected to a drum diameter changing member 36 via a connecting plate 43.

  With the configuration described above, when the ball screw 41 is rotated by the rotation of the adjustment shaft 40, the drum diameter changing member 36 is moved in the axial direction via the nut 42 and the connecting plate 43. As a result, the cam action of the inclined cam members 37a and 37b causes each segment 33 to move synchronously in the radial direction intersecting the axis of the shaft cylinder 30, and the molding drum 17 constituted by an assembly of a plurality of segments 33 is provided. The drum diameter is changed and adjusted.

  In order to prevent gaps between the segments 33 even if the drum diameter of the forming drum 17 is changed and adjusted, unevenness 33a and 33b as shown in FIG. The adjacent segments 33 are configured to overlap each other by the engagement of the projections and depressions 33a and 33b. Thus, a drum surface continuous in the circumferential direction is formed.

  Among the plurality of segments 33 on the circumference described above, the opposing end surfaces of the pair of joining segments 45 and 46 corresponding to the joints at both ends of the rubber sheet 15 are comb-like irregularities as shown in FIG. 45a and 46a are formed over a predetermined depth, and the comb-like irregularities 45a and 46a mesh with each other. Accordingly, holding portions 45b and 46b for holding both ends of the rubber sheet 15 by comb-like convex portions are formed on the outer surfaces of the joining segments 45 and 46, respectively. In this way, by overlapping the pair of joining segments 45, 46 by the comb-like irregularities 45a, 46a, the joining segments 45, 46 are completely held to the both end edges of the rubber sheet 15, It becomes possible to join the both end surfaces of the rubber sheet 15.

  As shown in FIG. 9, the holding portions 45 b and 46 b have minute height wavy claws that bite into the surface of the rubber sheet 15 so that the rubber sheet 15 does not retract with respect to the holding portions 45 b and 46 b when the rubber sheet 15 is joined. 45c, 46c, for example, serrated claws are formed.

  Engagement pins 47 and 48 project from the both ends of the pair of joining segments 45 and 46 in the axial direction. The engagement pins 47 and 48 change the distance L in the tangential direction (circumferential direction) of the forming drum 17 by the radial movement of the segments 45 and 46, that is, by the enlargement / reduction of the drum diameter of the forming drum 17. Accordingly, both end portions of the rubber sheet 15 held by the joining segments 45 and 46 are brought into contact with each other as the drum diameter is reduced.

  Next, the structure of the rubber sheet joining apparatus 13 that joins both end portions of the rubber sheet 15 wound around the forming drum will be described with reference to FIGS. 3, 4, and 7. The rubber sheet bonding apparatus 13 is disposed above the molding drum 17, and a movable member 52 is guided to the fixed frame 50 through a plurality of guide bars 51 so as to be able to advance and retreat in the vertical direction (radial direction of the molding drum 17). Yes. The movable member 52 is advanced and retracted with respect to the molding drum 17 by a pressing cylinder 53 installed on the fixed frame 50. A pair of guide rails 55 constituting a linear guide are installed at the distal end (lower end) of the movable member 52, and two sets of moving bodies 57, 58 are formed on the guide rails 55 via the guide blocks 59, 60. Are attached to each other in a tangential direction (circumferential direction).

  That is, the two sets of moving bodies 57 and 58 are arranged opposite to each other across a vertical axis L0 (see FIG. 9) passing through the center of the forming drum 17, and these moving bodies 57 and 58 are in the axial direction of the forming drum 17. It has a length that approximately matches the length. Comb-like irregularities 57a, 58a are formed on the opposing end surfaces of the respective moving bodies 57, 58 over a predetermined depth, and these comb-like irregularities 57a, 58a mesh with each other. Thus, pressing portions 57b and 58b are formed on the lower surfaces of the moving bodies 57 and 58, respectively, by pressing the both end portions of the rubber sheet 15 over the entire length by the comb-like convex portions. In this way, the pair of moving bodies 57 and 58 are overlapped with each other by the comb-like irregularities 57a and 58a, so that the pressing portions 57b and 58b of the moving bodies 57 and 58 are completely extended to both end edges of the rubber sheet 15. It is possible to join both end faces of the rubber sheet 15 in the pressed state.

  As shown in FIG. 9, the pressing portions 57 b and 58 b have a minute height wavy nail that bites into the surface of the rubber sheet 15 so that the rubber sheet 15 does not retreat with respect to the pressing portions 57 b and 58 b when the rubber sheet 15 is joined. 57c, 58c, for example, serrated claws are formed.

  As shown in FIGS. 7 and 8, contact pieces 61 and 62 project from the movable bodies 57 and 58 toward the movable member 52, respectively. The contact pieces 61 and 62 are fixed to the movable member 52. The stoppers 65 and 66 are brought into contact with the urging force of a spring 64 inserted between the bracket 63 provided. Each of the moving bodies 57 and 58 is normally held at a position where the abutting pieces 61 and 62 abut against the stoppers 65 and 66, whereby the respective moving bodies 57 and 58 can be moved relative to each other in the direction away from each other. However, relative movement in a direction approaching each other (a direction against the urging force of the spring 63) is allowed.

  Engagement blocks 67 and 68 are attached to both sides in the longitudinal direction of the respective moving bodies 57 and 58, and engagement recesses 67a and 68a are formed in the engagement blocks 67 and 68 downward. The engagement recesses 67a and 68a of the engagement blocks 67 and 68 are engaged with engagement pins 47 and 48 projecting from the pair of joining segments 45 and 46 by the advance and retreat operation of the movable member 52. When the pair of joining segments 45 and 46 are approached in the tangential direction of the forming drum 17 with the engaging pins 47 and 48 engaged with the engaging recesses 67a and 68a, the moving bodies 57 and 58 are synchronized. And then move closer.

  The above-described engagement blocks 67 and 68 and the engagement pins 47 and 48 constitute the synchronous movement means in the claims. By this synchronous movement means, the holding portions 45a and 45b formed in the joining segments 45 and 46 are formed. The pressing portions 57a and 57b formed on the moving bodies 57 and 58 are moved synchronously. Note that the engaging pins may be provided on the moving bodies 57 and 58 side and the engaging blocks may be provided on the joining segments 45 and 46 side, and the configuration of the synchronous moving means is not particularly limited.

  Next, the operation in the embodiment configured as described above will be described. First, the operation of winding the rubber sheet 15 around the outer periphery of the molding drum 17 will be described. When the rubber sheet 15 is wound, the molding drum 17 is held in an expanded state, and the pair of joining segments 45 and 46 are positioned at an angular position located directly below the molding drum 17.

  When the rubber sheet 15 cut to a predetermined length according to the type and size of the tire is supported on the support base 24 of the rubber sheet transport apparatus 11, the transport base 23 supporting the support base 24 is transported in a not-illustrated manner. 1 is conveyed to the right in FIG. 1 along the rail 22 by the cylinder for use, and one end (winding end portion) 15a of the rubber sheet 15 corresponds to one of the pair of joining segments 45 and 46 located directly below the forming drum 17. It is positioned at the position to do.

  Subsequently, the support base 24 of the rubber sheet conveying device 11 is raised by the lifting cylinder 25, and the winding start end portion 15 a of the rubber sheet 15 contacts the outer periphery of the molding drum 17 (one of the pair of joining segments 45 and 46). It is contacted and held by suction by a suction holding means (not shown). In this state, the conveyance table 23 that supports the support table 24 is moved to the right in FIG. 1, and the molding drum 17 is rotated by the rubber sheet winding device 12, so that the rubber sheet 15 is removed from the molding drum 17. The winding end portion 15b is wound around the outer periphery by one turn, and the winding end portion 15b is wound around the outer periphery of the molding drum 17 (the other of the pair of joining segments 45 and 46) by suction holding means (not shown) in the same manner as the winding start end portion 15a. Adsorbed and held.

  In this way, the seam between the winding start end portion 15a and the winding end end portion 15b of the rubber sheet 15 has a slight gap on the outer periphery of the forming drum 17, that is, between the joining segments 45 and 46. Opposed. Thereafter, the molding drum 17 is rotated approximately 180 degrees by the rubber sheet winding device 12, and the seam of the rubber sheet 15 is positioned at an upward angular position facing the rubber sheet bonding device 13.

  In this state, the movable member 52 of the rubber sheet bonding apparatus 13 is lowered by the pressing cylinder 53, and the engagement recesses 67a and 68a of the engagement blocks 67 and 68 attached to the moving bodies 57 and 58 are a pair of bonding. The engaging pins 47 and 48 projecting from the segments 45 and 46 are respectively engaged, and the pressing portions 57 b and 58 b of the movable bodies 57 and 58 are pressed against both ends of the rubber sheet 15 by the thrust of the pressing cylinder 53. It is done. Thus, both end portions of the rubber sheet 15 are sandwiched from the inside and the outside by the holding portions 45b and 46b of the joining segments 45 and 46 and the pressing portions 57a and 58b of the moving bodies 57 and 58, respectively. Note that the sandwiching of the rubber sheet 15 by the joining segments 45 and 46 and the moving bodies 57 and 58 is continued by the following action of the pressing cylinder 53 while the drum diameter of the molding drum 17 is reduced.

  Thereafter, the adjusting shaft 40 of the forming drum 17 is rotated by a rotation driving means (not shown). The ball screw 41 is rotated by the rotation of the adjustment shaft 40, and the drum diameter changing member 36 is moved to the right in FIG. 5 along the axial direction via the nut 42 and the connecting plate 43. Thereby, the plurality of segments 33 on the circumference including the joining segments 45 and 46 are moved radially inward along the guide members 35a and 35b by the cam action of the inclined cam members 37a and 37b. The drum diameter is reduced.

  As the drum diameter of the molding drum 17 is reduced, the pair of joining segments 45 and 46 corresponding to the joints at both ends of the rubber sheet 15 move inward in the radial direction and tangential to the molding drum 17 orthogonal thereto. Since it also moves in the (circumferential direction), the engaging pins 47 and 48 projecting from the pair of joining segments 45 and 46 have a tangential distance L (see FIG. 9) as the drum diameter of the forming drum 17 decreases. ) Is reduced and displaced. Accordingly, the pair of moving bodies 57 and 58 that engage with the engaging pins 47 and 48 via the engaging blocks 67 and 68 also approach each other in conjunction with the movement of the segments 45 and 46 in the tangential direction (circumferential direction). Relatively moved in the direction of

  As described above, as the drum diameter of the molding drum 17 is reduced, the holding portions 45b and 46b of the joining segments 45 and 46 holding the both ends of the rubber sheet 15 and the pressing portions 57b and 58b of the moving bodies 57 and 58 are sandwiched. Are moved in a direction approaching each other, both end surfaces (the winding start end portion 15a and the winding end end portion 15b) of the rubber sheet 15 are brought close to each other, and finally both end surfaces are firmly pressed and butt-joined.

  At this time, the joining segments 45 and 46 formed with the holding portions 45b and 46b for sandwiching the rubber sheet 15 and the moving bodies 57 and 58 formed with the pressing portions 57a and 58a are respectively comb-shaped uneven portions 45a, 46a and 57a. , 58a so that both end surfaces of the rubber sheet 15 can be pressed against each other with a predetermined amount of pressing allowance in a state where the both ends of the rubber sheet 15 are completely clamped. In addition, the slippage of the rubber sheet 15 at the time of press contact is prevented by the wave-like claws 45c, 46c and 57c, 58c formed on the holding portions 45b, 46b and the pressing portions 57b, 58b.

  As a result, even when both end portions of the rubber sheet 15 are pressed with a strong pressing force, the pressing portion (joining portion) does not rise, and the flatness can be improved. Further, since the swell does not occur, it is not necessary to level the swelled part while applying heat to the conventional rubber sheet 15 after joining both ends, and the quality of the rubber sheet 15 is not deteriorated by heat. Can be kept uniform.

  Thus, when the process of joining the both ends of the rubber sheet 15 is completed, for example, as described in JP-A-2001-138404, the periphery of the rubber sheet 15 is adsorbed and held by a vacuum pad (not shown). In this state, the suction pad is moved in the axial direction of the molding drum 17, and the rubber sheet 15 is separated from the outer periphery of the molding drum 17. Thereafter, the rubber sheet 15 released from the outer periphery of the molding drum 17 is conveyed to the next tire assembly process.

  In the above-described embodiment, the pair of joining segments 45 and 46 forming the holding portions 45b and 46b are moved relative to each other in the tangential direction while moving in the radial direction of the forming drum by expanding and contracting the drum diameter of the forming drum 17. The both end portions of the rubber sheet 15 are pressed and joined by the relative movement in the tangential direction. However, if the relative movement amount in the tangential direction of the molding drum of the holding portions 45b and 46b is desired to be large, the holding portion 45b and 46b can also be relatively moved by separate relative moving means independent of the joining segments 45 and 46.

  Note that the specific configurations of the rubber sheet bonding apparatus 13 and the forming drum 17 described in the above-described embodiment are merely examples suitable for carrying out the present invention, and the present invention is not limited thereto. Of course, various modes can be adopted without departing from the gist of the present invention.

It is a top view which shows roughly the whole structure of the rubber sheet manufacturing apparatus which shows embodiment of this invention. It is a side view of FIG. It is a front view which shows a rubber sheet joining apparatus. It is the side view seen from the A direction of FIG. It is sectional drawing of the forming drum cut | disconnected along the BB line of FIG. It is the figure seen from the C direction of FIG. It is the figure seen from the D direction of FIG. It is the figure seen from the arrow along the EE line of FIG. It is a figure which expands and shows the operation state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Rubber sheet conveying apparatus, 12 ... Rubber sheet winding apparatus, 13 ... Rubber sheet joining apparatus, 15 ... Rubber sheet, 17 ... Molding drum, 33 ... Segment, 36. ..Drum diameter changing member, 40... Adjustment shaft, 41... Ball screw, 42... Nut, 45 and 46... Segment for joining, 45a and 46a. , 46b ... holding portion, 45c, 46c ... wave-like claws, 47, 48 ... engaging pins, 52 ... movable member, 53 ... pressing cylinder, 57, 58 ... moving body , 57a, 58a ... comb-like irregularities, 57b, 58b ... pressing part, 57c, 58c ... corrugated claw, 67, 68 ... engagement block, 67a, 68a ... engagement recess .

Claims (4)

First and second holding portions that are provided on the molding drum and are engaged with each other in an overlapping state by using a joining method in which both ends of a rubber sheet wound around the outer periphery of the molding drum are joined by butt joining. The rubber sheet is sandwiched between first and second pressing portions that are provided on a movable member that can approach and separate in the radial direction of the forming drum and are engaged with each other in an overlapping state. The first and second holding portions and the first and second pressing portions in a state where both end portions of the rubber sheet are sandwiched between the second holding portion and the first and second pressing portions, respectively. A rubber sheet joining method, wherein both ends of the rubber sheet are butt-joined by relatively moving a portion in a tangential direction of the molding drum. In a joining device that joins both ends of a rubber sheet wound around the outer periphery of a molding drum by butt joining, a molding drum whose drum diameter can be expanded and contracted, and a movable that can advance and retreat in the radial direction of the molding drum with respect to the molding drum A first holding portion and a second holding portion for holding both end portions of the rubber sheet, respectively, are movably provided in the radial direction of the molding drum, and the movable member is provided with the first holding portion. First and second pressing portions that press the both end portions of the rubber sheet against the second holding portion are provided so as to be relatively movable in a tangential direction of the molding drum, and the first and second holding portions and The first and second pressing portions are formed with meshing portions that mesh with each other so as to overlap each other, and the first and second holding portions are relatively moved in the tangential direction of the forming drum. Rubber sheet joining apparatus, characterized in that said first and second pressing portion in synchronism is provided a synchronous moving means for relatively moving in the tangential direction of the forming drum. 3. The rubber sheet according to claim 2, wherein a rubber sheet is provided on a surface of the first and second holding portions and the first and second pressing portions in contact with the rubber sheet on the first and second holding portions and the first and second holding portions. A rubber sheet joining apparatus in which wavy claws are formed to bite into a rubber sheet so as not to retreat with respect to the second pressing portion. In Claim 2 or Claim 3, the said synchronous movement means is each provided in the said 1st engagement member provided in the said 1st and 2nd holding part, respectively, and the said 1st and 2nd pressing part, A rubber sheet joining apparatus comprising a second engaging member that can be engaged with and disengaged from the first engaging member by advancing and retracting a movable member.

Images