JP2013071304A - Joining device and manufacturing method for tire component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce irregularities generated on surfaces of ends of a tire component after the ends are joined to each other.SOLUTION: This joining device 1 joins the ends of the tire component S to each other. A pair of joining members 10 is rolled on the ends of the tire component S and bite the ends of the tire component S between teeth engaging with each other to join the ends to each other. A first pressing means 30 presses the pair of joining members 10 against the ends of the tire component S. A grinding roller 20 is rolled on the joined ends of the tire component S to grind the surfaces of the ends. A second pressing means 40 presses the grinding roller 20 against the joined ends of the tire component S.

Description

  The present invention relates to a joining device for a tire constituent member for joining ends of tire constituent members and a method for manufacturing the tire constituent member.

  An unvulcanized tire is formed by a sheet-like tire constituent member. The tire constituent member is formed into a sheet shape from unvulcanized rubber (or unvulcanized rubber and another member) and used for molding an unvulcanized tire. For example, a sheet-like carcass ply is made of unvulcanized rubber and a cord and is wound around a molding drum. Both ends of the carcass ply are joined by a joining device on the forming drum. As this joining device, a device that joins the ends of the cord ply with a pair of top bodies (joining members) is known (see Patent Document 1).

  In the conventional joining device, the pair of pieces has a cone surface and teeth that mesh with each other. The pair of pieces are moved along the ends of the cord ply, and the ends are brought into contact with each other by the pair of pieces. At that time, the end portion of the cord ply is raised by the butting force, and a thick portion may be generated at the end portion. On the other hand, in the conventional joining apparatus, apart from the pair of pieces, the leveling roller is pressed against the end portion of the cord ply and moved along the end portion. By pressing the end of the cord ply with a leveling roller, the thick part is made thinner.

  However, in the conventional joining apparatus, the thick portion is only pressed by the leveling roller, and the thick portion may not be sufficiently thinned. Moreover, when the trace of joining by a pair of piece body adheres to the edge part of a cord ply, in addition to a thick convex part, a recessed part may be formed in the surface of an edge part. When unevenness occurs at the end, it is difficult for the leveling roller to reduce the unevenness. Therefore, the improvement is calculated | required from a viewpoint of improving the uniformity of a tire structural member.

JP 2001-105508 A

  The present invention has been made in view of the above-described conventional problems, and its purpose is to reduce the unevenness generated on the surface of the end portion after joining the end portions of the tire constituent member, thereby improving the uniformity of the tire constituent member. It is to let you.

The present invention is a tire constituent member joining device that joins end portions of tire constituent members formed in a sheet shape with rubber, and between the teeth that roll on the end portions of the tire constituent members and mesh with each other. A pair of joining members that bite and join the ends of the tire constituent members, a first pressing means that presses the pair of joining members against the ends of the tire constituent members, and the ends of the tire constituent members after joining A tire constituent member joining device comprising: a grinding roller that rolls to grind the surface of an end portion; and a second pressing means that presses the grinding roller against the end portion of the tire constituent member after joining.
Further, the present invention is a method for manufacturing a tire constituent member for manufacturing a joined tire constituent member by joining ends of tire constituent members formed into a sheet shape with rubber, and the first pressing means A step of pressing the pair of joining members against the end portions of the tire constituent member, a step of rolling the pair of joining members on the end portions of the tire constituent member, and a tooth configuration between the teeth of the pair of joining members engaging with each other The step of biting and joining the end portions of the members, the step of pressing the grinding roller against the ends of the tire constituent members after joining by the second pressing means, and the steps of the tire constituent members after joining the grinding rollers. It is a manufacturing method of a tire constituent member which has a process of rolling on an end, and a process of grinding a surface of an end of a tire constituent member with a grinding roller.

  According to this invention, the unevenness | corrugation which arises on the surface of an edge part can be reduced after joining of the edge parts of a tire structural member. Moreover, the uniformity of a tire structural member can be improved.

It is a figure which shows the joining apparatus of the tire structural member of this embodiment. It is a figure which shows a pair of joining member of this embodiment. It is a front view of the grinding roller of this embodiment. It is a figure which shows the relationship between the thickness of a tire structural member, and the amount of unevenness | corrugations. It is the top view of the joining apparatus seen from the arrow V2 direction of FIG. It is a figure which shows the relationship between the joint strength of a tire structural member, and an open rate.

Hereinafter, a tire constituent member joining device (hereinafter referred to as a joining device) according to the present invention will be described with reference to the drawings. Moreover, one Embodiment of the manufacturing method of a tire structural member is also described.
The joining device of this embodiment is an automatic joining device that automatically joins tire constituent members formed in a sheet shape with rubber. The joining device abuts and joins end portions (joint end portions) of the tire constituent members. The ends of the tire constituent members are joined together to produce a tire constituent member (joined tire constituent member) with the joined ends.

  In addition, a tire structural member is a member which comprises each part of a tire. The tire constituent member may be a member made of unvulcanized rubber and another member, or may be a member made of only unvulcanized rubber. The tire constituent member is formed in a sheet shape from rubber. Further, the tire constituent member is formed into a predetermined shape by cutting or the like. The joining device abuts end portions of one or a plurality of tire constituent members, and crimps and joins the end portions. Hereinafter, a carcass ply will be described as an example of a tire constituent member. The tire constituent member (carcass ply) has a plurality of cords (for example, metal cords). The tire constituent member is disposed on the outer periphery of the molding drum in the molding process of the unvulcanized tire. Both end portions of the tire constituent member are joined to form the tire constituent member in a cylindrical shape.

FIG. 1 is a diagram illustrating a bonding apparatus according to the present embodiment. In FIG. 1, the principal part of the joining apparatus 1 is shown typically. A cross-sectional view of the forming drum 2 and the tire component S is also shown.
As illustrated, the joining device 1 includes a pair of joining members 10 (only one is shown in FIG. 1), a grinding roller 20, two pressing means 30 and 40, a moving device 50, and a control device 3. It has. The joining device 1 joins the tire constituent member S on the forming drum 2.

  The molding drum 2 is a support body that supports the tire constituent member S to be joined when an unvulcanized tire is molded. The outer periphery of the forming drum 2 is enlarged and reduced by an enlargement / reduction mechanism (not shown) made of a bladder or the like. The tire component S is wound around the outer periphery of the forming drum 2 once. The forming drum 2 holds a cylindrical tire constituent member S on the outer periphery. The forming drum 2 has a cylindrical shape and is rotated around an axis line by a rotation driving device (not shown). The rotation drive device includes a motor and a transmission mechanism that transmits the rotational power of the motor to the forming drum 2. The forming drum 2 rotates the tire constituent member S and stops at an arbitrary rotation angle.

  The tire constituent member S is wound around the molding drum 2 or the molding drum 2 on which other members are arranged. The tire constituent member S is affixed to the forming drum 2. Both ends of the tire constituent member S are arranged in a predetermined direction (for example, the axial direction of the forming drum 2). Further, both end portions of the tire constituent member S are arranged to face each other and are supported by the molding drum 2. The joining device 1 joins the ends of the tire constituent member S to each other by a pair of joining members 10 on the forming drum 2. At the time of joining the ends, the pair of joining members 10 are moved in the moving direction (joining direction) T by the moving device 50.

  FIG. 2 is a view showing a pair of joining members 10. 2A is a front view of the pair of joining members 10 as viewed from the direction of the arrow V1 in FIG. 2B is a plan view of the pair of joining members 10 as viewed from the direction of the arrow V2 in FIG. FIG. 2B schematically shows the pair of joining members 10. FIG. 2 also shows end portions S1 and S2 of the tire constituent member S.

  The pair of joining members 10 are a biting means that bites the end portions S1 and S2 of the tire constituent member S and a joining means that joins the end portions S1 and S2. The pair of joining members 10 are composed of joining rollers formed in a bevel gear shape, and join the ends S1 and S2 while rotating. The pair of joining members 10 have a truncated cone shape, and are respectively attached to the central shaft 11. The central shaft 11 is supported by a support member 12. The joining member 10 rotates around the central axis 11. The pair of joining members 10 are tilted in opposite directions so that the outer circumferences thereof are in contact with the tire constituent member S. The axes of the pair of joining members 10 intersect at the center plane between the pair of joining members 10. Further, the pair of joining members 10 are arranged so as to open toward the moving direction T.

  The pair of joining members 10 includes a plurality of teeth 13 formed on the edge and a plurality of protrusions 14 formed on the outer periphery. The plurality of teeth 13 are protrusions and are formed at equal intervals in the circumferential direction of the bonding member 10. The teeth 13 of the pair of joining members 10 are engaged at a predetermined engagement position (engagement position) 15. Thus, the pair of joining members 10 is formed in a bevel gear shape having a truncated cone shape and teeth 13 that mesh with each other. When the plurality of teeth 13 are sequentially engaged with each other, the pair of joining members 10 are rotated at the same speed in conjunction with each other. The ridges 14 are formed along the circumferential direction of the joining member 10. The plurality of protrusions 14 are arranged side by side on a predetermined portion of the joining member 10 including the teeth 13. The plurality of ridges 14 are pressed against the end portions S1 and S2 of the tire constituent member S.

  The pair of joining members 10 is pressed against the end portions S1 and S2 of the tire constituent member S and moves along the end portions S1 and S2. At that time, the meshing position 15 of the pair of joining members 10 is pressed against the tire constituent member S. The pair of joining members 10 roll on the ends S1 and S2 of the tire constituent member S to join the ends S1 and S2. In addition, you may rotate a pair of joining member 10 with the motor (not shown) which is a rotational drive device during rolling.

  With the rolling of the pair of joining members 10, the ends S <b> 1 and S <b> 2 of the tire constituent member S are attracted by the force applied from the pair of joining members 10. The end portions S1 and S2 are strongly abutted and pressed. Further, the end portions S1 and S2 are bitten between the teeth 13 meshing with each other. The pair of joining members 10 is joined between the teeth 13 meshing with each other by biting the ends S1 and S2. The joining apparatus 1 joins edge part S1, S2 continuously by a pair of joining member 10, and forms the tire structural member S in a cylinder shape.

  The pair of joining members 10 (see FIG. 1) is held by the position adjusting means 60. The position adjusting means 60 is provided between the pair of joining members 10 and the first pressing means 30. The first pressing means 30 includes a piston / cylinder mechanism. The piston rod 31 moves in and out of the cylinder 32. The position adjusting means 60 is attached to the tip of the piston rod 31. The first pressing means 30 operates the piston / cylinder mechanism to move the position adjusting means 60 and the pair of joining members 10. Accordingly, the pair of joining members 10 approaches the tire constituent member S or leaves the tire constituent member S. Further, the first pressing means 30 presses the pair of joining members 10 against the ends S1 and S2 of the tire constituent member S with a predetermined pressure.

  The position adjusting means 60 adjusts the position where the teeth 13 of the pair of joining members 10 mesh (meshing position 15) during joining of the tire constituent member S. The position adjusting unit 60 includes a fixed member 61, a movable member 62, and a displacement roller 63. The fixing member 61 is fixed to the first pressing means 30 (piston rod 31). The movable member 62 is connected to the shaft member 64 of the fixed member 61. The movable member 62 is inclined with respect to the fixed member 61 by moving around the shaft member 64. The fixed member 61 and the movable member 62 constitute a swing mechanism. The support member 12 of the pair of joining members 10 is fixed to the movable member 62. The pair of joining members 10 are connected to the movable member 62.

  The displacement roller 63 is rotatably attached to the movable member 62 at a position adjacent to the pair of joining members 10. The displacement roller 63 is disposed in front of the moving direction T with respect to the pair of joining members 10. During joining of the end portions S1 and S2 of the tire constituent member S, the displacement roller 63 rolls on the end portions S1 and S2 before joining immediately before the joining member 10. When the tire constituent member S has the convex portion S3, the displacement roller 63 is displaced according to the surface of the convex portion S3. At the same time, the movable member 62 is inclined by the displacement of the displacement roller 63, and the meshing position 15 of the pair of joining members 10 is changed.

  The position adjusting means 60 adjusts the meshing position 15 according to the undulation of the tire constituent member S by the displacement roller 63 and the movable member 62. The meshing position 15 is displaced so as to follow the surface of the tire constituent member S. Further, the meshing position 15 is adjusted on the ends S1 and S2 of the tire constituent member S by the position adjusting means 60 in accordance with the undulation of the tire constituent member S. The pair of joining members 10 joins the end portions S1 and S2 of the tire constituent member S at the meshing position 15. The joining apparatus 1 grinds the surfaces of the joined ends S1 and S2 with the grinding roller 20 while joining the tire constituent members S. The grinding roller 20 is disposed behind the pair of joining members 10 in the movement direction T.

FIG. 3 is a front view of the grinding roller 20. 3 shows the grinding roller 20 as viewed from the direction of the arrow V1 in FIG.
The grinding roller 20 has a cylindrical shape and is supported on the rotating shaft 22 of the support member 21. The grinding roller 20 has a friction surface 23 that rubs the tire component S. The friction surface 23 is formed on the outer peripheral surface of the grinding roller 20. The friction surface 23 is formed by knurling so that a plurality of concave grooves intersect each other. Thereby, the friction surface 23 is formed in the rough surface (uneven surface) with a large frictional force with rubber | gum.

  The grinding roller 20 is pressed against the end portions S1 and S2 of the tire constituent member S and moves along the end portions S1 and S2. At that time, the friction surface 23 is pressed against the joined ends S1 and S2. The grinding roller 20 rolls on the ends S1 and S2 of the tire constituent member S after joining, and the joined ends S1 and S2 are rubbed by the friction surface 23. The friction surface 23 rubs the rubber on the surface and the convex and concave portions at the end portions S1 and S2. The grinding roller 20 grinds the surfaces of the end portions S <b> 1 and S <b> 2 with the friction surface 23. Thereby, the unevenness | corrugation of the surface of edge part S1, S2 is made small. As the grinding roller 20 rolls, the ends S1 and S2 of the tire constituent member S become smooth.

  The joining apparatus 1 includes a heating unit 24 that heats the grinding roller 20. The heating means 24 includes, for example, a heater provided in the grinding roller 20 and a temperature sensor that measures the temperature of the grinding roller 20. The heating means 24 heats the grinding roller 20 to a predetermined temperature. The grinding roller 20 heats the ends S1 and S2 of the tire constituent member S to soften the rubber. Thereby, end part S1, S2 of the tire structural member S becomes easy to grind. The unevenness on the surfaces of the end portions S <b> 1 and S <b> 2 is more reliably reduced by grinding the grinding roller 20.

  The support member 21 (see FIG. 1) of the grinding roller 20 is attached to the second pressing means 40. Similar to the first pressing means 30, the second pressing means 40 is composed of a piston / cylinder mechanism. The piston rod 41 moves in and out of the cylinder 42. The support member 21 is attached to the tip of the piston rod 41. The second pressing means 40 operates the piston / cylinder mechanism to move the grinding roller 20. Thereby, the grinding roller 20 approaches the tire constituent member S or moves away from the tire constituent member S. Further, the second pressing means 40 presses the grinding roller 20 against the ends S1 and S2 of the tire constituent member S after joining with a predetermined pressure.

  The second pressing means 40 operates independently from the first pressing means 40. The pair of joining members 10 and the grinding roller 20 are pressed against the tire constituent member S independently of each other. The pair of joining members 10 and the grinding roller 20 are pressed against the tire constituent member S by the first and second pressing means 30 and 40 with respectively set forces (pressures). The pair of joining members 10 and the grinding roller 20 are pressed against the ends S1 and S2 of the tire constituent member S with different forces (or the same force). Here, the second pressing means 40 presses the grinding roller 20 against the ends S1, S2 with a force stronger than the force with which the pair of joining members 10 are pressed against the ends S1, S2.

  The first and second pressing means 30 and 40 are connected to the moving device 50. The moving device 50 includes a guide rail 51 and a moving member 52. The guide rail 51 is arranged linearly above the forming drum 2. The moving member 52 is attached to the guide rail 51 and moves along the guide rail 51. The first and second pressing means 30 and 40 are fixed to the lower surface of the moving member 52. Further, the moving device 50 includes a driving device (not shown) that moves the moving member 52. For example, the drive device includes a screw shaft, a nut attached to the screw shaft, and a motor that rotates the screw shaft. The nut is fixed to the moving member 52. The drive device rotates the screw shaft to move the nut and the moving member 52.

  The moving device 50 moves the pressing means 30, 40, the pair of joining members 10, the position adjusting means 60, and the grinding roller 20 in the movement direction T by the movement of the moving member 52. When joining the tire constituent member S, the moving device 50 moves the pair of joining members 10 and the grinding roller 20 along the ends S1 and S2 of the tire constituent member S. The pair of joining members 10 and the grinding roller 20 roll on the ends S1 and S2. At the same time, the pair of joining members 10 are pressed against the end portions S1 and S2 by the first pressing means 30 to join the end portions S1 and S2. The grinding roller 20 is pressed against the joined ends S1 and S2 by the second pressing means 40, thereby grinding the surfaces of the ends S1 and S2.

  Note that “on the ends S1 and S2 of the tire constituent member S” refers to a state in contact with the ends S1 and S2 of the tire constituent member S and on the surfaces of the ends S1 and S2. Accordingly, the pair of joining members 10 and the grinding roller 20 roll while in contact with the end portions S1 and S2 of the tire constituent member S.

  The joining device 1 is controlled by the control device 3 to execute the joining operation of the tire constituent member S. The control device 3 includes a computer having a microprocessor and a memory (ROM, RAM). In addition, the control device 3 controls the heating unit 24 and the pressing units 30 and 40 of the grinding roller 20. The control device 3 changes the heating temperature of the grinding roller 20 by the heating means 24 according to the thickness of the tire constituent member S. The control device 3 also changes the force (referred to as pressing force) for pressing the grinding roller 20 by the second pressing means 40 against the end portions S1 and S2 according to the thickness of the tire constituent member S. Therefore, the control device 3 is also a temperature changing unit and a pressing force changing unit of the grinding roller 20.

FIG. 4 is a diagram showing the relationship between the thickness of the tire constituent member S and the amount of unevenness. FIG. 4 shows the relationship between the thickness of the tire constituent member S and the unevenness when the grinding roller 20 is not used.
In the graph shown in FIG. 4, the horizontal axis (x axis) is the thickness (mm) of the tire constituent member S. The vertical axis (y-axis) is the unevenness (mm) of the ends S1, S2 of the tire constituent member S after joining. The unevenness amount is an average value of the steps between the convex portions and the concave portions generated on the surfaces of the end portions S1 and S2. The tire constituent members S having four thicknesses were joined by a pair of joining members 10 under various conditions. At that time, the ends S <b> 1 and S <b> 2 of the tire constituent member S were joined by the pair of joining members 10 without performing grinding by the grinding roller 20. After joining, the unevenness amounts of the end portions S1 and S2 were measured.

  When the tire constituent member S becomes thick, the rubber on the surface of the tire constituent member S increases. The amount of deformation of the rubber increases at the joint portion formed by the pair of joint members 10. Further, as shown in the figure, the thicker the tire constituent member S, the larger the unevenness of the end portions S1 and S2 after joining. The amount of unevenness tends to increase in proportion to the thickness of the tire component S. As in the example shown in FIG. 4, the tire constituent member S is actually joined, and the relationship between the thickness of the tire constituent member S and the unevenness amount is grasped. Based on the result, the heating temperature and the pressing force of the grinding roller 20 are set corresponding to the thickness of the tire constituent member S, respectively.

  The heating temperature and pressing force of the grinding roller 20 are set separately. The set values of the heating temperature and the pressing force are stored in the control device 3. As the set values of the heating temperature and the pressing force, values are set such that the unevenness amounts of the end portions S1 and S2 are reduced to the target unevenness amount, respectively. The heating temperature and the pressing force are set such that the thicker the tire constituent member S, the larger the amount of grinding of the surfaces (rubber) of the end portions S1 and S2 by the grinding roller 20. Further, the heating temperature and pressing force of the grinding roller 20 are adjusted to respective set values, and the surfaces of the end portions S1 and S2 are actually ground by the grinding roller 20. Based on the result, each set value is corrected so that the unevenness amount is reduced to the target unevenness amount.

  When joining the tire constituent member S, the operator inputs the thickness of the tire constituent member S to the control device 3. The control device 3 changes the heating temperature of the grinding roller 20 according to the thickness of the tire constituent member S. Further, the control device 3 changes the pressing force of the grinding roller 20 according to the thickness of the tire constituent member S. The surfaces of the end portions S1 and S2 after joining are ground by the grinding roller 20 in which the heating temperature and the pressing force are adjusted. For example, as the tire constituent member S becomes thicker, the heating temperature is increased or the pressing force is increased, and the surfaces of the end portions S1 and S2 are crushed by the grinding roller 20 more. Thereby, the unevenness | corrugation amount of edge part S1, S2 is reduced to target uneven | corrugated amount. The heating temperature and the pressing force may be set for each joining condition of the pair of joining members 10.

Next, operation | movement of the joining apparatus 1 is demonstrated. Moreover, the process of joining the tire constituent member S and the process of manufacturing the joined tire constituent member S will be described.
FIG. 5 is a plan view of the joining apparatus 1 as seen from the direction of the arrow V2 in FIG. In FIG. 5, only the displacement roller 63, the pair of joining members 10, and the grinding roller 20 are shown.

  First, the tire constituent member S (see FIGS. 1 and 5) is wound around the outer periphery of the forming drum 2, and the tire constituent member S is disposed on the forming drum 2. The end portions S1 and S2 of the tire constituent member S are arranged so as to be parallel to the moving direction T and are abutted on the molding drum 2. Next, the forming drum 2 is rotated. When the end portions S1 and S2 of the tire constituent member S move to the joining position by the joining device 1, the rotation of the molding drum 2 is stopped.

  The joining device 1 moves the pair of joining members 10 and the grinding roller 20 in the moving direction T by the moving device 50 and starts joining the ends S1 and S2. The moving device 50 moves the pair of joining members 10 and the grinding roller 20 from one side edge of the tire constituent member S to the other side edge along the end portions S1 and S2. At that time, the first pressing means 30 presses the pair of joining members 10 against the ends S1 and S2 of the tire constituent member S. Thereby, a pair of joining member 10 rolls on edge part S1, S2 of the tire structural member S. As shown in FIG. As described above, the pair of joining members 10 are joined by joining the end portions S1 and S2 of the tire constituent member S between the teeth 13 meshing with each other. The meshing position 15 of the teeth 13 is adjusted by the position adjusting means 60 on the ends S1 and S2 corresponding to the undulation of the tire constituent member S.

  The joining apparatus 1 presses the grinding roller 20 against the ends S1 and S2 of the tire constituent member S after joining by the second pressing means 40. Further, the grinding roller 20 is rolled on the ends S1 and S2 of the tire constituent member S. The surface of the end portions S1 and S2 is ground by the grinding roller 20. At that time, the grinding roller 20 is heated to a temperature corresponding to the thickness of the tire constituent member S by the heating means 24. The grinding roller 20 is pressed against the tire constituent member S by the second pressing means 40 with a pressing force corresponding to the thickness of the tire constituent member S. The joining apparatus 1 grinds the joined ends S1 and S2 by the grinding roller 20 while joining the entire ends S1 and S2 by the pair of joining members 10. Thereby, joining of edge part S1, S2 is completed, and the joined tire constituent member S is manufactured.

  As described above, in this embodiment, the unevenness generated at the ends S1 and S2 can be reduced by the grinding roller 20 after joining the ends S1 and S2 of the tire constituent member S. The ends S1 and S2 become smooth, and the unevenness of the thickness and the surface state of the tire constituent member S is reduced. Therefore, the uniformity of the tire constituent member S can be improved.

  The pair of joining members 10 and the grinding roller 20 are pressed against the ends S1 and S2 by the first and second pressing means 30 and 40 independently of each other. Therefore, the pair of joining members 10 and the grinding roller 20 can be pressed against the ends S1 and S2 with a pressing force according to each condition (joining conditions and grinding conditions). The pair of joining members 10 and the grinding roller 20 are pressed against the ends S1 and S2 with appropriate forces. For example, the grinding roller 20 is pressed against the ends S1 and S2 with a strong force or with a force that can effectively reduce the unevenness. Thereby, the unevenness | corrugation of edge part S1, S2 can be reduced reliably. The end portions S <b> 1 and S <b> 2 can be reliably joined by the pair of joining members 10.

  The heating temperature of the grinding roller 20 is changed according to the thickness of the tire constituent member S. Therefore, the unevenness | corrugation of edge part S1, S2 can be reliably reduced with the tire structural member S of various thickness. By changing the pressing force of the grinding roller 20 according to the thickness of the tire constituent member S, the unevenness of the end portions S1 and S2 can be reliably reduced. When the meshing position 15 of the pair of joining members 10 is adjusted in accordance with the undulations of the tire constituent member S, the ends S1 and S2 can be joined accurately. The joining strength (referred to as the joining strength of the tire constituent member S) at the ends S1 and S2 of the tire constituent member S is also uniform.

  Note that only the heating temperature of the grinding roller 20 may be changed according to the thickness of the tire constituent member S without changing the pressing force of the grinding roller 20. Only the pressing force of the grinding roller 20 may be changed according to the thickness of the tire constituent member S without changing the heating temperature of the grinding roller 20. The ends S1 and S2 may be ground by the grinding roller 20 without changing the heating temperature and pressing force of the grinding roller 20. Further, the grinding roller 20 may not be heated. Even in this case, the crushing roller 20 can sufficiently reduce the unevenness generated at the ends S1 and S2.

  By using a bevel gear-shaped joining roller for the pair of joining members 10, the joining strength of the tire constituent member S is increased. As a result, the end portions S1 and S2 of the tire constituent member S can be reliably and firmly joined. The joined tire constituent member S is expanded by the molding drum 2 in the molding process of the unvulcanized tire. Depending on the expansion rate of the tire constituent member S, a large force may be applied to the joined ends S1 and S2. By firmly joining the end portions S1 and S2, it is possible to prevent the end portions S1 and S2 from opening when the tire constituent member S is expanded. The rate at which the ends S1 and S2 open (referred to as the open rate) is also reduced.

FIG. 6 is a diagram showing the relationship between the bonding strength of the tire constituent member S and the open ratio. FIG. 6 is a graph showing an example of the bonding strength and the open ratio.
In the graph shown in FIG. 6, the horizontal axis represents the bonding strength of the tire constituent member S. The vertical axis represents the open rate of the tire constituent member S. Here, the tire constituent member S is joined by a pair of joining members 10 under a plurality of conditions. The joining result by the pair of joining members 10 is located in H1 of FIG. For comparison, the tire constituent member S was joined by a cylindrical joining roller (referred to as a cylindrical roller). The result of joining by the cylindrical roller is H2 in FIG.

  After joining, the joining strength of the tire constituent member S was measured. The bonding strength is expressed as an index with the value measured by the cylindrical roller being 1. The larger the value, the higher the bonding strength. Further, the tire constituent member S after being joined was expanded by the forming drum 2 at an expansion rate of 240%. After joining a plurality of tire constituent members S under the same conditions, the tire constituent members S were expanded, and the number of tire constituent members S with the end portions S1 and S2 opened was counted. The open ratio of the tire constituent member S is represented by an index with the count number by the cylindrical roller being 1.

  As illustrated, the pair of joining members 10 can increase the joining strength of the tire constituent member S. Further, the pair of joining members 10 can reduce the open rate of the tire constituent member S. Specifically, the joining strength of the tire constituent member S is about 1.4 times that of the cylindrical roller by joining with the pair of joining members 10. The open ratio of the tire constituent member S is about 0.7 times that of the cylindrical roller by joining with the pair of joining members 10. Even if the tire constituent member S is greatly expanded (for example, an expansion rate of 150 to 250%), the end portions S1 and S2 can be prevented from opening by being joined by the pair of joining members 10. However, when the tire constituent member S is joined by the pair of joining members 10, the unevenness of the end portions S1 and S2 tends to increase. On the other hand, the unevenness | corrugation of edge part S1, S2 after joining can be reduced by grinding edge part S1, S2 with the grinding roller 20. FIG.

  In this embodiment, the example which joins the tire structural member S on the forming drum 2 was demonstrated. On the other hand, the tire constituent member S can be joined even on a support other than the molding drum 2 by using the joining device 1. For example, the tire constituting member S arranged on a planar support member or conveyor can be joined by the joining device 1.

  DESCRIPTION OF SYMBOLS 1 ... Joining apparatus of tire structural member, 2 ... Molding drum, 3 ... Control apparatus, 10 ... Joining member, 11 ... Center axis, 12 ... Support member, 13 ... Teeth, 14 ... protrusions, 15 ... meshing position, 20 ... grinding roller, 21 ... support member, 22 ... rotating shaft, 23 ... friction surface, 24 ... heating , 30 ... first pressing means, 31 ... piston rod, 32 ... cylinder, 40 ... second pressing means, 41 ... piston rod, 42 ... cylinder, 50. ..Moving device, 51... Guide rail, 52... Moving member, 60... Position adjusting means, 61... Fixed member, 62. ..Shaft member, S... Tire constituent member, S1, S2... End portion, S3.

Claims (8)

A joining device for a tire constituent member for joining ends of tire constituent members formed in a sheet shape with rubber,
A pair of joining members that roll on the ends of the tire constituent members and engage and join the ends of the tire constituent members between the meshing teeth;
A first pressing means for pressing the pair of joining members against the ends of the tire constituent members;
A grinding roller that rolls on the end of the tire component after joining to grind the surface of the end,
A second pressing means for pressing the grinding roller against the end of the tire component after joining;
The joining apparatus of the tire structural member provided with this. In the joining apparatus of the tire structural member described in Claim 1,
Heating means for heating the grinding roller;
Temperature changing means for changing the heating temperature of the grinding roller by the heating means according to the thickness of the tire constituent member;
The joining apparatus of the tire structural member provided with this. In the joining apparatus of the tire structural member described in Claim 1 or 2,
An apparatus for joining tire constituent members, comprising pressing force changing means for changing the pressing force of the grinding roller by the second pressing means in accordance with the thickness of the tire constituent member. In the joining apparatus of the tire structural member according to any one of claims 1 to 3,
An apparatus for joining tire constituent members, comprising position adjusting means for adjusting the positions at which the teeth of a pair of joining members mesh with the undulations of the tire constituent members. In the joining apparatus of the tire structural member according to any one of claims 1 to 4,
A joining apparatus for tire constituent members, wherein the pair of joining members is a joining roller formed in a bevel gear shape. It is a method for manufacturing a tire constituent member that joins end portions of tire constituent members formed in a sheet shape with rubber, and manufactures the joined tire constituent member,
A step of pressing the pair of joining members against the ends of the tire constituent members by the first pressing means;
Rolling a pair of joining members on the ends of the tire constituent members;
Between the teeth of the pair of joining members meshing with each other, the step of biting and joining the ends of the tire constituent members;
A step of pressing the grinding roller against the end of the tire component after joining by the second pressing means;
Rolling on the end of the tire component after joining the grinding roller;
A step of grinding the surface of the end of the tire component by a grinding roller;
The manufacturing method of the tire structural member which has this. In the manufacturing method of the tire constituent member according to claim 6,
A method for manufacturing a tire constituent member, comprising a step of heating the grinding roller to a temperature corresponding to the thickness of the tire constituent member. In the manufacturing method of the tire constituent member according to claim 6 or 7,
The manufacturing method of the tire structural member which a pair of joining member consists of the joining roller formed in the bevel gear shape.

Images