JP7017884B2 - Tire parts manufacturing equipment - Google Patents

Description

The present invention relates to a tire member manufacturing apparatus and a tire member manufacturing method.

A sheet-shaped rubber member, for example, a carcass ply, is used for forming an unvulcanized tire by joining the start end portion and the end portion of winding on a forming drum, and at that time, the ends are overlapped and joined. Then, the joint portion becomes thicker, and the rigidity and weight in the vicinity thereof increase locally. Therefore, conventionally, it is necessary to abut and join the ends by a joining device called a zipper device. (See Patent Documents 1 and 2 below).

Special re-publication 2012-124779 Japanese Unexamined Patent Publication No. 2011-21285

In such a zipper device, a pair of joining rollers move along the ends of the rubber members while rotating synchronously, so that the ends of the rubber members are pulled together and the ends of the rubber members are joined to each other. In order to securely join, a pair of joining rollers may be arranged vertically so as to sandwich the ends of the rubber members vertically. In that case, the end of the rubber member is placed in the slit-shaped opening provided on the peripheral surface of the molded drum that supports the rubber member, and the joining roller moves inside the opening to move the joining roller up and down. Join while sandwiching the end of the rubber member with.

However, the end portion of the rubber member located at the opening portion is not supported by the forming drum and easily hangs down due to its own weight, and if the end portions are joined to each other as they are, the joining strength is lowered. Further, when the rubber member has a reinforcing cord, the reinforcing cord in the vicinity of the joint portion is arranged so as to be displaced downward as compared with other reinforcing cords, which may cause quality deterioration.

In view of the above problems, it is an object of the present invention to obtain high bonding strength in a tire member manufacturing apparatus and a tire member manufacturing method in which the ends of rubber members are butted against each other to be joined.

The device for manufacturing a tire member of the present invention includes a support that supports a sheet-shaped rubber member in which a cord is embedded, and an opening provided on the upper side of the support that extends along the end of the rubber member. A pair of first lower joining rollers for joining the ends of the rubber member to each other by moving the inside of the opening to one side along the end of the rubber member. By moving the pair of first upper joining rollers and the inside of the opening to the other side opposite to the one side along the end portion of the rubber member, the end portion of the rubber member is pulled together and the rubber is pulled. A pair of second lower joining rollers and a pair of second upper joining rollers for joining the ends of the members, and a first supporting portion for supporting the lower surface of the rubber member on the one side of the first lower joining roller. A second support portion that supports the lower surface of the rubber member on the other side of the second lower joining roller, a lower arm that extends along the end portion of the rubber member, and a lower arm that extends above the lower arm are arranged at intervals. It is provided with an upper arm extending along the end portion of the rubber member and a connecting portion connecting the lower arm and the other end portion of the upper arm, and the connecting portion is sequentially provided from the connecting portion to the one side. The first support portion, the second lower joining roller, the first lower joining roller, and the first support portion are provided on the upper surface of the lower arm so as to face the first lower joining roller vertically. The upper joining roller is provided on the lower surface of the upper arm, the second upper joining roller is provided on the lower surface of the upper arm so as to face the second lower joining roller vertically, and the connecting portion is the first. When the lower joining roller and the first upper joining roller reach the one side end of the rubber member, the lower arm and the lower arm are connected so as to be located on the other side of the support, and the first. The 1 support portion and the second support portion include a roller rotatably supported in the moving direction of the first lower joining roller and the second lower joining roller.

In a preferred embodiment of the present invention, the upper ends of the first lower joining roller and the second lower joining roller may be located at the same height as the upper ends of the first support portion and the second support portion.

In another preferred embodiment of the present invention, the first support portion and the second support portion may move with a certain distance from the first lower joining roller and the second lower joining roller .

In the present invention, since the lower surface of the rubber member is supported in front of the moving direction of the joining roller to be joined by pulling the ends of the rubber members together, it is possible to join the rubber members while suppressing the sagging of the ends, which is high. Bond strength can be obtained.

The front view of the tire member manufacturing apparatus which concerns on one Embodiment of this invention. Enlarged view of the main part of FIG. FIG. 2 is a sectional view taken along the line AA of FIG. The figure which looked at the 1st joining roller from the front in the moving direction. (A) to (h) are diagrams showing the joining process of the end portion of the carcass ply.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the tire member manufacturing apparatus of the present embodiment is one of unvulcanized tires in which both ends P1 and P2 of a sheet-shaped carcass ply P having a reinforcing cord are joined in a butt state. A forming drum 10, a joining device 20, and a moving mechanism 50 are provided with respect to an apparatus for manufacturing a tire member constituting the portion. In the present embodiment, a case where both ends P1 and P2 of the carcass ply P having a reinforcing cord are joined will be described, but the present invention describes a sheet-shaped rubber member having no cord other than the carcass ply P. , Can be applied to a sheet-shaped rubber member in which a cord is embedded.

The forming drum 10 is a rotary support that can rotate around a horizontal axial center, and a slit-shaped opening 12 extending along the axial direction L is provided on the outer peripheral surface. In the forming drum 10, the ply cord is aligned along the axial direction L of the forming drum 10 so that both ends P1 and P2 of the carcass ply P are located at the opening 12 in a state where the opening 12 is positioned upward. A carcass ply P is wound around the outer peripheral surface of the forming drum 10 to support it.

The molded drum 10 of the present embodiment includes a plurality of segments (not shown) divided in the circumferential direction and a drive mechanism (not shown) for moving each segment in the radial direction, and is provided so that the diameter can be expanded or contracted. ..

The joining device 20 includes a pressing roller 21, a first joining roller 22, a first support portion 23, a second joining roller 24, and a second support portion 25, and a moving mechanism 50 is used to open the inside of the opening 12 of the forming drum 10. It moves along both ends P1 and P2 of the carcass ply P, that is, in the axial direction L of the forming drum 10.

The first joining roller 22 includes a pair of first lower joining rollers 22a and a pair of first upper joining rollers 22b provided at intervals on one side L1 of the forming drum 10 in the axial direction from the pressing roller 21.

As shown in FIG. 4, the pair of first lower joining rollers 22a are rollers located under the carcass ply P when moving inside the opening 12 of the forming drum 10, and are located on the lower surface of the carcass ply P. A tapered contact portion 22a1 that comes into contact with the contact portion 22a1 and a tooth portion 22a2 provided on the lower side of the contact portion 22a1 are provided, and the tooth portions 22a2 are rotatably provided on the roller support base 26 so as to mesh with each other.

The pair of first upper joining rollers 22b has rollers having the same shape as the first lower joining roller 22a arranged vertically symmetrically, and is located above the carcass ply P when moving inside the opening 12 of the forming drum 10. To position. The pair of first upper joining rollers 22b includes a tapered contact portion 22b1 that contacts the upper surface of the carcass ply P and a tooth portion 22b2 provided under the contact portion 22b1, and the tooth portions 22b2 mesh with each other. As described above, the roller support base 27 is rotatably provided.

Such a first joining roller 22 is provided on one side in the axial direction (with the both ends P1 and P2 of the carcass ply P sandwiched between the pair of first lower joining rollers 22a and the pair of first upper joining rollers 22b. (Right side in the drawings of FIGS. 1 and 2) When moving to L1, both ends of the carcass ply P rotate while the pair of first lower joining rollers 22a and the pair of first upper joining rollers 22b rotate due to the frictional force with the carcass ply P. P1 and P2 are pulled together and both ends P1 and P2 are butted against each other and joined.

The pair of first lower joining rollers 22a and the pair of first upper joining rollers 22b have their rotation axes first joined in the vertical direction (vertical direction) in the front view as shown in FIGS. 1 and 2. The direction in which the roller 22 moves forward, that is, the direction in which the pair of first lower joining rollers 22a and the pair of first upper joining rollers 22b move when the both ends P1 and P2 of the carcass ply P are abutted and joined (one in the axial direction). The roller support bases 26 and 27 are provided on the roller support bases 26 and 27 so as to be inclined by a predetermined angle θ toward the side L1) (see FIG. 2).

The first support portion 23 is provided with a gap D1 on one side L1 in the axial direction from the first joining roller 22, and moves together with the first joining roller 22 while holding the gap D1 by the moving mechanism 50. The lower surfaces of both ends P1 and P2 of the carcass ply P are supported in front of the first joining roller 22 in the moving direction.

Since the first support portion 23 moves smoothly with respect to the supported carcass ply P, the tangential direction of the upper end of the outer peripheral surface coincides with the moving direction of the first joining roller 22, and the moving direction of the first joining roller 22. It is preferable that the roller is a cylindrical roller that is rotatably supported.

The second joining roller 24 includes a pair of second lower joining rollers 24a and a pair of second upper joining rollers 24b provided at intervals from the pressing roller 21 on the other side L2 of the forming drum 10 in the axial direction.

The pair of second lower joining rollers 24a and the pair of second upper joining rollers 24b constituting the second joining roller 24 are a pair of first lower joining rollers 22a and a pair of first joining rollers 22a constituting the first joining roller 22. Since it is composed of rollers having the same shape as the upper joining roller 22b, detailed description of the shapes of the second lower joining roller 24a and the second upper joining roller 24b will be omitted here.

Further, the pair of second lower joining rollers 24a are arranged symmetrically with the pair of first lower joining rollers 22a and the pressing roller 21 interposed therebetween, and the pair of second upper joining rollers 24b presses with the pair of first upper joining rollers 22b. They are arranged symmetrically with the roller 21 in between. That is, the pair of second lower joining rollers 24a and the pair of second upper joining rollers 24b are second-joined with their rotation axes in the vertical direction (vertical direction) in the front view as shown in FIGS. 1 and 2. The direction in which the roller 24 moves forward, that is, the direction in which the pair of second lower joining rollers 24a and the pair of second upper joining rollers 24b move when the both ends P1 and P2 of the carcass ply P are abutted and joined (the other in the axial direction). The roller support bases 28 and 29 are provided so as to be inclined by a predetermined angle θ toward the side L2).

In such a second joining roller 24, both ends P1 and P2 of the carcass ply P are sandwiched between the pair of second lower joining rollers 24a and the pair of second upper joining rollers 24b, and the other side in the axial direction. (Left side in the drawings of FIGS. 1 and 2) When moving to L2, the pair of second lower joining rollers 24a and the pair of second upper joining rollers 24b rotate due to the frictional force with the carcass ply P, so that the carcass ply P Both ends P1 and P2 are pulled together and both ends P1 and P2 are butted against each other and joined.

The second support portion 25 is provided with a gap D2 on the other side L2 in the axial direction of the second joining roller 24, and moves together with the second joining roller 24 while holding the gap D2 by the moving mechanism 50. The lower surfaces of both ends P1 and P2 of the carcass ply P are supported in front of the second joining roller 24 in the moving direction.

Since the second support portion 25 moves smoothly with respect to the carcass ply P to be supported, the tangential direction of the upper end of the outer peripheral surface coincides with the movement direction of the second joining roller 24 as in the first support portion 23. It is preferable that the roller is a cylindrical roller that is rotatably supported in a direction parallel to the moving direction of the second joining roller 24.

Here, to give an example of dimensions, when the first support portion 23 and the second support portion 25 are composed of a cylindrical roller having a diameter of 25 mm, the distance D1 between the first joining roller 22 and the first support portion 23 and The distance D2 between the second joining roller 24 and the second support portion 25 can be set to 15 mm.

The pressing roller 21 includes a lower pressing roller 21a and an upper pressing roller 21b provided between the first joining roller 22 and the second joining roller 24. The lower pressing roller 21a and the upper pressing roller 21b are formed of cylindrical rollers rotatably supported in the axial direction L of the forming drum 10, and are provided so as to face each other vertically. The pressing roller 21 presses the joint portion of the carcass ply P formed by the first joint roller 22 and the second joint roller 24 between the first joint roller 22 and the second joint roller 24 to flatten the carcass ply P. At the same time, increase the joint strength.

The upper ends (tops) of the first support portion 23 and the second support portion 25 are preferably located at the same height as the upper ends (tops) of the first lower joining roller 22a and the second lower joining roller 24a. Further, it is preferable that the lower pressing roller 21a is located at the same height as the upper end (top).

The moving mechanism 50 is a mounting bracket having a guide rail 51 provided along the axial direction L of the forming drum 10, a screw shaft 58 arranged in parallel with the guide rail 51, and a screw hole screwed with the screw shaft 58. It includes a drive unit 53 that rotates a screw shaft 58 around an axis, and a support frame 54 that is fixed to a mounting bracket 52 and slidably provided with respect to a guide rail 51.

In the moving mechanism 50, the drive unit 53 rotates the screw shaft 58 around the axis to move the mounting bracket 52 along the axial direction L, and the support frame 54 fixed to the mounting bracket 52 is moved in the axial direction L. Slide and move along.

The support frame 54 includes a lower arm 54a and an upper arm 54b extending in the axial direction L of the forming drum 10, and the upper arm 54b is arranged above the lower arm 54a at intervals.

A lower pressing roller 21a, a first lower joining roller 22a, a first support portion 23, a second lower joining roller 24a, and a second support portion 25 are provided on the upper surface of the lower arm 54a.

On the lower surface of the upper arm 54b, an upper pressing roller 21b is vertically opposed to the lower pressing roller 21a, and a first upper joining roller 22b is vertically opposed to the first lower joining roller 22a. A second upper joining roller 24b is provided so as to face the roller 24a vertically. The upper pressing roller 21b, the first upper joining roller 22b, and the second upper joining roller 24b provided on the upper arm 54b are attached to the upper arm 54b via cylinders 55, 56, 57, respectively, and each cylinder 55. , 56, 57 move the lower pressing roller 21a, the first lower joining roller 22a, and the second lower joining roller 24a, which face each other downward, in close proximity to each other.

Such a moving mechanism 50 causes the joining device 20 provided on the support frame 54 by the operation of the drive unit 53 from the standby position on the outside of the forming drum 10 (the left side of the forming drum 10 in FIGS. 1 and 3) to form the forming drum. It is moved in the axial direction L of the forming drum 10 through the inside of the opening 12 of 10. At that time, since the pressing roller 21, the first joining roller 22, the first support portion 23, the second joining roller 24, and the second support portion 25 constituting the joining device 20 are attached to the support frame 54, the forming drum It moves while keeping an interval of 10 in the axial direction L.

Next, a method of joining both ends P1 and P2 of the carcass ply P in a butt-butted state using the tire member manufacturing apparatus 1 of the present embodiment will be described with reference to FIG.

First, as shown in FIG. 5A, the ply cord is formed on the drum 10 so that both ends P1 and P2 of the carcass ply P are located at the openings 12 in a state where the joining device 20 is located at the standby position. The carcass ply P is wound around the outer peripheral surface of the forming drum 10 along the axial direction L.

Next, as shown in FIG. 5 (b), the moving mechanism 50 moves the joining device 20 from the standby position through the inside of the opening 12 of the forming drum 10 in the axial direction L of the forming drum 10, and first joins. The roller 22 is moved to a position where the roller 22 reaches the central portion of the carcass ply P in the axial direction L (hereinafter, this position may be referred to as a “first start position”).

When the joining device 20 moves to the first start position, as shown in FIG. 5C, the moving mechanism 50 moves the first upper joining roller 22b downward by the cylinder 56 to the first lower joining roller 22a. Both ends P1 and P2 of the carcass ply P are sandwiched between the first upper joining roller 22b and the carcass ply P.

Then, in the moving mechanism 50, with the first joining roller 22 sandwiching both ends P1 and P2 of the carcass ply P vertically, the joining device 20 is placed on one side in the axial direction (right side in the drawings of FIGS. 1 and 2) L1. The first joining roller 22 abuts and joins both ends P1 and P2 of the carcass ply P on one side L1 from the central portion of the axial direction L of the carcass ply P.

Then, as shown in FIG. 5D, when the pressing roller 21 reaches the central portion of the carcass ply P in the axial direction L, that is, both ends P1 and P2 of the carcass ply P are joined by the first joining roller 22. When the pressing roller 21 reaches the formed portion, the upper pressing roller 21b is moved downward by the cylinder 55, and both ends P1 and P2 of the carcass ply P are sandwiched between the lower pressing roller 21a and the upper pressing roller 21b.

Then, in the moving mechanism 50, with the pressing roller 21 and the first joining roller 22 sandwiching both ends P1 and P2 of the carcass ply P up and down, the pressing roller 21 has the carcass ply P as shown in FIG. 5 (e). The joining device 20 is moved to one side in the axial direction (right side in the drawings of FIGS. 1 and 2) L1 until it reaches L1 on one side in the axial direction. As a result, the first joining roller 22 abuts and joins both ends P1 and P2 of the carcass ply P on one side L1 from the central portion of the axial direction L of the carcass ply P, and the pressing roller 21 joins the first joining roller 22. Press the jointed part with.

When the first joining roller 22 abuts and joins both ends P1 and P2 of the carcass ply P in this way, the first support member 23 is the first joining roller 22 in front of the moving direction of the first joining roller 22. It supports both ends P1 and P2 of the carcass ply P immediately before joining and suppresses the sagging of both ends P1 and P2.

When the first joining roller 22 joins both ends P1 and P2 of the carcass ply P from the central portion in the axial direction L to the end on one side in the axial direction, as shown in FIG. 5 (f), the moving mechanism 50 is a cylinder. After moving the upper pressing roller 21b and the first upper joining roller 22b upward by 55, 56, the joining device 20 is at a position where the second joining roller 24 reaches the central portion of the carcass ply P in the axial direction L (hereinafter, this). Move the position to (sometimes called the "second start position").

When the joining device 20 moves to the second start position, as shown in FIG. 5 (g), the moving mechanism 50 moves the upper pressing roller 21b and the second upper joining roller 24b downward by the cylinders 55 and 57. Both ends P1 and P2 of the carcass ply P are sandwiched between the second lower joining roller 24a and the second upper joining roller 24b, and both ends P1 of the carcass ply P are also sandwiched between the lower pressing roller 21a and the upper pressing roller 21b. , P2 is sandwiched.

Next, as shown in FIG. 5 (h), the moving mechanism 50 holds the joining device 20 in the axial direction with the pressing roller 21 and the second joining roller 24 sandwiching both ends P1 and P2 of the carcass ply P in the vertical direction. Move to the other side (left side in the drawings of FIGS. 1 and 2) L2. As a result, the second joining roller 24 abuts and joins both ends P1 and P2 of the carcass ply P on the other side L2 in the axial direction from the center of the axial direction L of the carcass ply P, and the pressing roller 21 joins the second joining. Press the jointed portion with the roller 24. At that time, the second support portion 25 supports both ends P1 and P2 of the carcass ply P immediately before being joined by the second joining roller 24 in front of the moving direction of the second joining roller 24, and the both ends P1 and P2 hang down. suppress.

The second joining roller 24 joins both ends P1 and P2 of the carcass ply P from the center of the axial direction L of the carcass ply P to the other end in the axial direction, and joins both ends P1 and P2 of the carcass ply P. When the movement is completed, the moving mechanism 50 moves the upper pressing roller 21b and the second upper joining roller 24b upward by the cylinders 55 and 57, and then moves the joining device 20 to the standby position shown in FIG. 5A. , Finish the joining of the carcass ply P.

In the present embodiment as described above, the first support portion 23 and the second support portion 25 support both ends P1 and P2 of the carcass ply P immediately before being joined by the first joining roller 22 and the second joining roller 24. It is possible to suppress the sagging of both ends P1 and P2. Therefore, the entire end faces of both ends P1 and P2 of the carcass ply P can be pressure-bonded, and high bonding strength can be obtained. Further, when the rubber member to be joined has a cord embedded as in the present embodiment, it is possible to suppress the positional deviation of the ply cord in the vicinity of the joint portion.

Further, in the present embodiment, the first support portion 23 and the second support portion 25 that support the lower surface of the carcass ply P are cylinders that are rotatably supported in the moving direction of the first joining roller 22 and the second joining roller 24. Since the roller has a shape, the first support portion 23 and the second support portion 25 can be smoothly moved with respect to the carcass ply P, and damage to the carcass ply P can be suppressed.

Further, in the present embodiment, the upper end of the first support portion 23 and the upper end of the second support portion 25 are located at the same height as the upper ends of the first lower joining roller 22a and the second lower joining roller 24a. When the 1 support portion 23 and the second support portion 25 support the carcass ply P, the distance between both end portions P1 and P2 does not widen, and the position shift of the ply cord in the vicinity of the joint portion can be suppressed.

Further, in the present embodiment, the joining device 20 has a first joining roller 22 in which the rotation axis is tilted toward L1 on one side in the axial direction and a second joining roller 24 in which the rotation axis is tilted toward L2 on the other side in the axial direction. Therefore, even if the joining device 20 is moved in either the axial direction L1 on one side or L2 on the other side without providing a mechanism for changing the inclination angle of the rotation axis of the joining roller, both ends of the carcass ply P are provided. P1 and P2 can be joined, and the configuration of the joining device 20 can be simplified. Moreover, since the first support portion 23 and the second support portion 25 are provided in front of the first joining roller 22 and the second joining roller 24 in the moving direction, respectively, the joining device 20 can be mounted on one side L1 and the other side L2 in the axial direction. Regardless of which of the two, it is possible to suppress the sagging of both ends P1 and P2 of the carcass ply P immediately before being joined by the joining rollers 22 and 24.

Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention.

10 ... Forming drum, 12 ... Opening, 20 ... Joining device, 21 ... Pressing roller, 21a ... Lower pressing roller, 21b ... Upper pressing roller, 22 ... First joining roller, 22a ... First lower joining roller, 22b ... First 1 Upper bonding roller, 23 ... 1st support, 24 ... 2nd bonding roller, 24a ... 2nd lower bonding roller, 24b ... 2nd upper bonding roller, 25 ... 2nd support, 50 ... Moving mechanism, 51 ... Guide Rail, 52 ... slide member, 53 ... drive unit, 54 ... support frame, 55 ... cylinder, 56 ... cylinder), 57 ... cylinder, P ... carcass ply

Claims (3)

A support for supporting a sheet-shaped rubber member in which a cord is embedded, an opening provided on the upper side of the support extending along the end of the rubber member, and the inside of the opening of the rubber member. A pair of first lower joining rollers and a pair of first upper joining rollers that pull the ends of the rubber member together by moving to one side along the ends and join the ends of the rubber members to each other, and the above. By moving the inside of the opening along the end of the rubber member to the other side opposite to the one side, the ends of the rubber member are pulled together and the ends of the rubber member are joined to each other. A second lower joining roller, a pair of second upper joining rollers, a first support portion that supports the lower surface of the rubber member on the one side of the first lower joining roller, and the other side of the second lower joining roller. A second support portion that supports the lower surface of the rubber member, a lower arm that extends along the end portion of the rubber member, and a lower arm that is arranged above the lower arm at intervals and along the end portion of the rubber member. It comprises an extending upper arm and a connecting portion connecting the lower arm and the other end of the upper arm.
The second support portion, the second lower joining roller, the first lower joining roller, and the first support portion are provided on the upper surface of the lower arm in order from the connecting portion to the one side.
The first upper joining roller is provided on the lower surface of the upper arm so as to face the first lower joining roller vertically, and the second upper joining roller is provided so as to face the second lower joining roller vertically. Provided on the underside of the upper arm
The connecting portion includes the lower arm and the lower arm so as to be located on the other side of the support when the first lower joining roller and the first upper joining roller reach the one side end of the rubber member. Connect the lower arm ,
The first support portion and the second support portion are tire member manufacturing devices including the first lower joining roller and the rollers rotatably supported in the moving direction of the second lower joining roller . The tire member manufacturing apparatus according to claim 1, wherein the upper ends of the first lower joining roller and the second lower joining roller are located at the same height as the upper ends of the first support portion and the second support portion. The tire member manufacturing apparatus according to claim 1 or 2 , wherein the first support portion and the second support portion move with the first lower joining roller and the second lower joining roller at regular intervals.

Images