JP2017039287A - Side wall press roller and sticking method of side wall rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that can shorten a cycle time in molding by eliminating a manual process and automating a series of processes in sticking a side wall rubber, and can prevent generation of material scraps due to damage of the side wall rubber.SOLUTION: A side wall press roller 10 sticks a side wall rubber SW to a former while pressing the side wall rubber against the outside of a tread rubber wound on the former. The side wall press roller 10 comprises at least a roller 20 for pressing the thickest portion of the side wall rubber SW, and two rollers 22, 24 for pressing both end parts of the side wall rubber SW in a width direction, whose outer peripheral surfaces are inclined in substantially parallel to an inclination of a surface shape of the side wall rubber SW.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sidewall pressing roller and a method for attaching a sidewall rubber, which are used when forming a raw tire by attaching a sidewall rubber to the outside of a tread rubber.

  The pneumatic tire includes a tire having a so-called SOT structure (sidewall overtread structure) in which a sidewall rubber is molded on the outer side of the tread rubber, and a ply material having a predetermined length on the outer peripheral surface of the cylindrical former. After pasting various rubber members such as tread rubber, a raw tire is molded by pasting a pair of left and right side wall rubbers so as to cover each of the outer end portions of the tread rubber.

  FIG. 2 is a front view for explaining a conventional situation of attaching a side wall rubber in molding a raw tire having this SOT structure. As shown in FIG. 2, conventionally, the sidewall rubber SW is wound around both the left and right outer sides of the former 60 and applied while being pressed by the sponge pressing roller 50, and when the sidewall rubber SW makes a round of the former 60. Sidewall rubber SW is cut.

  Then, a joint that manually matches the start and end cut surfaces of the sidewall rubber SW is performed, and a joint press roller (not shown) is slid along the joint portion to crimp the start and end cut surfaces. (Patent Documents 1 and 2).

JP 2014-162041 A Japanese Unexamined Patent Publication No. 2014-117717

  However, in the pasting of the sidewall rubber, as described above, since the process of jointing the cut surfaces of the sidewall rubber is performed manually, it is necessary to once stop the line in this process, It became a factor that the cycle time in became long.

  In addition, if this type of manual joint is not used, the joints between the cut surfaces of the sidewall rubber will vary, and sliding the joint pressure roller in this state will damage the sidewall rubber and generate material scrap. There is a risk that it will be easier to do.

  Therefore, the present invention eliminates the manual process in attaching the sidewall rubber and automates a series of processes, thereby reducing the cycle time in molding and generating material scrap due to the damage of the sidewall rubber. It is an object of the present invention to provide a technique capable of preventing the problem.

  The inventor has intensively studied and found that the above-described problems can be solved by the invention described below, and has completed the present invention.

The invention described in claim 1
A sidewall pressing roller that is attached to the former while pressing the sidewall rubber on the outer side of the tread rubber wound on the former,
At least one roller that presses the thickest portion of the sidewall rubber, and the outer peripheral surface is inclined substantially parallel to the inclination of the surface shape of the sidewall rubber, and both end portions in the width direction of the sidewall rubber It is a side wall pressing roller characterized by having two rollers which press.

The invention described in claim 2
2. The sidewall pressing roller according to claim 1, wherein an inclination angle of the outer peripheral surface of the roller that presses both end portions in the width direction of the sidewall rubber is 5 to 15 °.

The invention according to claim 3
3. The sidewall pressing roller according to claim 1, wherein an outer peripheral surface of a roller that presses the thickest portion of the sidewall rubber is substantially parallel to an axial direction of the former.

The invention according to claim 4
The sidewall pressing roller according to any one of claims 1 to 3, wherein the roller is made of polyacetal resin.

The invention described in claim 5
A sidewall rubber for affixing the sidewall rubber to the former while pressing the sidewall rubber against the outside of the tread rubber using the sidewall pressing roller according to any one of claims 1 to 4. A pasting method,
The thickest part of the sidewall rubber is pressed by one roller, and both ends of the sidewall rubber are pressed by two rollers whose outer peripheral surfaces are inclined substantially parallel to the surface shape of the sidewall rubber. By doing so, the sidewall rubber is affixed to the former.

  According to the present invention, it is possible to reduce the cycle time in molding by automating a series of steps by eliminating the manual steps in the attachment of the sidewall rubber, and to generate material scrap due to the damage of the sidewall rubber. It is possible to provide a technology capable of preventing

It is a figure explaining arrangement | positioning of each roller at the time of pressing down a sidewall rubber | gum using the sidewall pressing roller which concerns on one embodiment of this invention. It is a front view explaining the pasting situation of the conventional sidewall rubber. It is a figure explaining the state which pressed the end part of sidewall rubber using the conventional sidewall pressing roller.

1. Background to the Present Invention In order to start the pressure bonding of the joint portion of the side wall rubber, which is the final step in the above-described pasting, by an automatic process, the cut surface of the side wall rubber in advance across the width direction of the side wall rubber. Therefore, it is necessary to joint the start and end of the side wall rubber so that no slippage or gap occurs.

  However, in the case of the conventional method, as shown in FIG. 2, since the outer peripheral surface of the pressing roller 50 is flat, a top portion that is the thickest portion of the sidewall rubber SW having a substantially triangular cross section is formed. Only the central portion in the width direction can be pressed, and only by automatically pressing using the pressing roller 50, the cut surfaces of the start end portion and the end end portion cannot be properly matched at both ends in the width direction, The whole width direction could not be properly jointed.

  Moreover, as shown in FIG. 3, even if the position of the pressing roller 50 is shifted and the end portion is pressed, the surface of the sidewall rubber SW is inclined, so that the cut surfaces are appropriately automatically jointed. I could not. As a result, the process of jointing the cut surfaces of the sidewall rubber had to be performed manually.

  Therefore, the present inventor properly presses not only the center portion of the sidewall rubber SW but also both end portions when the sidewall rubber is attached to the former so that the entire width direction of the sidewall rubber SW is adequately pressed. The present invention has been completed by further studying a press roller having a configuration capable of automatically jointing to the present invention.

2. DESCRIPTION OF EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram for explaining the arrangement of each roller when pressing the sidewall rubber using the sidewall pressing roller according to the present embodiment. Also in this embodiment, a pair of left and right side wall rubbers SW are pasted so as to cover each of the outer end portions of the tread rubber, as in the prior art shown in FIG. For convenience, only one side wall rubber SW is shown.

  The side wall pressing roller 10 according to the present embodiment (hereinafter also simply referred to as “pressing roller”) is provided on the outer side of a tread rubber (not shown) wound on a former 60 (see FIG. 2). It is the same as the conventional one in that it is a roller used for pasting while pressing.

  However, in the present embodiment, unlike the conventional pressing roller, the pressing roller 10 is divided into three rollers 20, 22, and 24 in the axial direction. Hereinafter, each roller will be described with the first central roller 20 in the axial direction, the second roller 22 on one end side, and the third roller 24 on the other end side.

  The first roller 20 is disposed so as to press the vicinity of the central portion in the width direction where the top portion 39 that is the thickest portion of the sidewall rubber SW is formed. The first roller 20 is configured such that the outer peripheral surface 20a is substantially parallel to the axial direction of the former.

  On the other hand, the 2nd roller 22 and the 3rd roller 24 are each arrange | positioned so that the both ends of the width direction of sidewall rubber SW may be pressed down. The outer peripheral surfaces 22a and 24a of the second rubber 22 and the third roller 24 are made of the sidewall rubber SW so that both end portions of the sidewall rubber SW whose thickness is thinner than the top portion 39 and whose surface is inclined can be appropriately pressed. Inclined so as to be substantially parallel to the inclined surfaces 36 and 38.

  Here, “substantially parallel” means that the outer peripheral surfaces 22a, 24a of the second roller 22 and the third roller 24 are along the inclined surfaces 36, 38 to such an extent that both end portions of the sidewall rubber SW can be appropriately pressed. Means that they need to be inclined and need not be completely parallel. Specifically, the difference between the inclination angle of the sidewall rubber SW and the inclination angles of the second roller 22 and the third roller 24 may be within 10 °.

  As described above, the outer peripheral surfaces 22a and 24a of the second roller 22 and the third roller 24, which are divided into the three rollers 20, 22, and 24 and arranged at both ends, are substantially the same as the inclined surfaces 36 and 38 of the sidewall rubber SW. By inclining so that it may become parallel, the center part and both ends of sidewall rubber SW can be suppressed appropriately.

  As a result, since the cut surfaces can be automatically joined across the width direction of the sidewall rubber SW without forming a gap or a gap, the start and end points manually performed in the prior art By automating the joint, the cycle time can be greatly shortened by automating a series of processes from pasting the sidewall rubber to crimping the joint.

  In addition, as described above, since the cut surfaces of the side wall rubber can be automatically jointed without any deviation or gap, the side wall rubber produced by the pressure bonding in a state where the deviation or gap is generated in the joint portion. Can be prevented, and the generation of material scrap can be suppressed.

  In the above-described embodiment, the pressing roller includes three rollers, but the number of rollers may be more than three. However, when the number of rollers is two, any one of the three points at the center and both ends will not be appropriately joined. For this reason, it is necessary to provide at least one roller that presses the thickest portion of the sidewall rubber and two rollers that press both ends.

  Further, as described above, the inclination angles of the outer peripheral surfaces 22a and 24a of the second roller 22 and the third roller 24 are appropriately set so as to be substantially parallel to the inclined surfaces 36 and 38 of the sidewall rubber SW. Is done. Usually, the outer peripheral surfaces 22a and 24a are set so as to be inclined by 5 to 15 ° with respect to the former axis.

  In the above-described embodiment, a roller whose outer peripheral surface is parallel to the axial direction of the former is used as the first roller that presses the thickest portion of the sidewall rubber SW. An inclined roller can also be used.

  Moreover, as a material of each roller 20, 22, 24, it is preferable to use a urethane resin, a polyacetal resin, etc., for example. These materials can appropriately prevent the deviation of the cut surfaces and the generation of gaps as compared with the sponge used for the conventional pressing roller. Among these, polyacetal resin is particularly preferable because of its high durability and long life until roller replacement.

1. Test Examples 1-8
As shown in Table 1, using rubber with different specifications (inclination angle of the outer peripheral surface of the roller, number of rollers and material), attaching side wall rubber to the former in a tire of size 245 / 40R18, joint Was done automatically. As the side wall rubber, a side wall rubber having a substantially triangular cross section with an inclination angle of 8 ° was used.

  As Test Example 1, a side wall rubber was attached to the outer peripheral surface of the former using a sponge pressing roller having a flat outer peripheral surface (roller angle 0 °).

  As Test Example 2, a sponge pressing roller having a flat outer peripheral surface (roller angle 0 °) was divided into two rollers, and sidewall rubber was affixed to the outer peripheral surface of the former using this pressing roller.

  In Test Example 3 to Test Example 8, as in the above-described embodiment, the pressing roller is divided into three rollers, and the outer peripheral surface is flat so as to press the top, which is the thickest part of the sidewall rubber. While arrange | positioning 1 roller, the outer peripheral surface of the 2nd roller and 3rd roller which press both ends was inclined.

  In Examples 3 to 8, the inclination angles of the outer peripheral surfaces of the second roller and the third roller are different from the material of the roller. Table 1 shows the inclination angles (roller angles) of the outer peripheral surfaces of the second roller and the third roller in Examples 3 to 8.

2. Evaluation (a) Pressing pressure When each of the above examples is carried out, pressure-sensitive paper is inserted between the former and the sidewall rubber, and pressure is applied to the central portion and both end portions of the sidewall rubber. I investigated. It was evaluated as “good” when appropriate pressure was applied to all three places, “good” when two places, and “impossible” when one or less places.

(B) Pressing state After pressing with the pressing roller, the joint portion was visually observed to confirm whether the joint portion had a deviation or a float. The case where there is no displacement or lifting of the joint part in the entire width direction of the sidewall rubber is `` good '', the case where the displacement and lifting are suppressed and the manual joint is unnecessary is `` good '', The case where there was a lot of displacement and floating and a manual joint was required was set as “impossible”.

(C) Roller life
Attaching the sidewall rubber with the pressing roller 100,000 times, visually checking the amount of wear on the outer peripheral surface of the roller, and based on the results, the life of each pressing roller is relatively “long” Or “short”.

3. Evaluation results Table 1 shows the results of the above evaluations.

  From Table 1, in Test Examples 1 to 3, both the pressing pressure and the pressing state were “impossible”, and a manual joint process was required. In Test Examples 5 to 7, the pressing pressure and the pressing state were Both were “OK” or higher, and it was confirmed that the joint could be crimped without performing a manual joint process.

  Moreover, in Test Example 4 and Test Example 8, although the pressing roller was divided into three and the rollers at both ends were inclined, appropriate pressing could not be performed. From this, it was confirmed that it was necessary to adjust the inclination of the rollers at both ends so as to be substantially parallel to the inclination of the target sidewall rubber.

  Moreover, as a result of comparing Test Examples 5 to 7, it was confirmed that the material of the roller was that urethane resin or polyacetal resin could be pressed more appropriately than sponge. Furthermore, among the urethane resin and polyacetal resin, it was confirmed that the polyacetal resin was preferable from the viewpoint of the life of the roller.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to said embodiment. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

10, 50 Side wall pressing roller 20 First roller 20a First roller 20 outer surface 22 Second roller 22a Second roller outer surface 24 Third roller 24a Third roller outer surface 36, 38 Side wall rubber inclined surface 39 Top of side wall rubber 60 Former SW Side wall rubber

Claims (5)

A sidewall pressing roller that is attached to the former while pressing the sidewall rubber on the outer side of the tread rubber wound on the former,
At least one roller that presses the thickest portion of the sidewall rubber, and the outer peripheral surface is inclined substantially parallel to the inclination of the surface shape of the sidewall rubber, and both end portions in the width direction of the sidewall rubber A side wall pressing roller characterized by comprising two rollers for pressing.   The sidewall pressing roller according to claim 1, wherein an inclination angle of the outer peripheral surface of the roller that presses both end portions in the width direction of the sidewall rubber is 5 to 15 °.   The sidewall pressing roller according to claim 1 or 2, wherein an outer peripheral surface of a roller that presses the thickest portion of the sidewall rubber is substantially parallel to an axial direction of the former.   The sidewall pressing roller according to any one of claims 1 to 3, wherein the roller is made of polyacetal resin. A sidewall rubber for affixing the sidewall rubber to the former while pressing the sidewall rubber against the outside of the tread rubber using the sidewall pressing roller according to any one of claims 1 to 4. A pasting method,
The thickest part of the sidewall rubber is pressed by one roller, and both ends of the sidewall rubber are pressed by two rollers whose outer peripheral surfaces are inclined substantially parallel to the surface shape of the sidewall rubber. By doing so, the sidewall rubber is affixed to the former.

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