JP2017128005A - Tread attaching apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tread attaching apparatus, which certainly attaches a center part of a tread rubber member onto a tire case on a forming drum prior to both side edge parts, and suppresses generation of remaining air between the center part of the tread rubber member and the tire case so that generation of quality error in tire may be suppressed.SOLUTION: There is provided a tread attaching apparatus attaching a tread rubber member onto a tire case formed on a forming drum by supplying the a sheet-shape tread rubber member to the forming drum with a tread forming servicer, in which both side edge parts on a tread rubber member loading part of the tread forming servicer are formed higher than the center part of the tread rubber member loading part. In the tread attaching apparatus, the tread rubber member loading part is formed to be curved in an arced-shape where both side edge parts of the tread rubber member loading part are arranged at upper side than the center part of the tread rubber member loading part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a tread sticking device including a tread molding servicer.

  In the manufacturing process of pneumatic tires, low cover molding is performed by supplying and pasting a tread rubber member on a tire case formed by laminating and pasting multiple types of rubber sheets on a cylindrical molding drum. Has been done. At this time, a tread pasting device provided with a belt conveyor-like tread molding servicer in front of the molding drum is used for supplying and pasting the tread rubber member (for example, Patent Document 1).

JP 2011-37113 A

  However, when a tread rubber member having a thick gauge on both side edges (shoulder portions) in the width direction for a snow tire or the like is supplied to a molding drum and pasted using a conventional tread pasting device, both sides of the tread rubber member The edge part is lowered by its own weight and stuck to the tire case on the molding drum before the center part, and air remaining is generated between the center part of the tread rubber member and the tire case during tire vulcanization. There was a risk of poor tire quality.

  Such a problem also occurs when a tread rubber member is attached to a tire case having a jointless band at the tire edge portion and having both side edge portions raised from the center portion.

  Therefore, the present invention reliably attaches the center portion of the tread rubber member to the tire case on the molding drum before the side edge portions, and air remains between the center portion of the tread rubber member and the tire case. It is an object of the present invention to provide a tread application device that can suppress the occurrence of tire quality defects.

  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
By supplying a sheet-like tread rubber member to a molding drum using a tread molding servicer, a tread pasting device for pasting the tread rubber member on a tire case molded on the molding drum,
In the tread application device, the side edge portions of the tread rubber member stacking portion of the tread molding servicer are formed to be higher than the central portion of the tread rubber member stacking portion.

The invention described in claim 2
The tread rubber member stacking portion is formed to be curved in an arc shape so that both side edges of the tread rubber member stacking portion are above the center portion of the tread rubber member stacking portion, and the radius of curvature thereof is It is 500-1000 mm, It is a tread sticking apparatus of Claim 1 characterized by the above-mentioned.

The invention according to claim 3
The center portion of the tread rubber member loading portion is formed flat,
An inclined surface rising at a predetermined inclination angle toward the outer side in the width direction is formed starting from a position of 500 to 800 mm from both side edges of the tread rubber member stacking portion toward the center side. The tread application device according to claim 1.

The invention according to claim 4
The tread application device according to claim 3, wherein an inclination angle of the inclined surface is 20 ° or more.

  According to the present invention, the center portion of the tread rubber member is securely attached to the tire case on the molding drum before the side edge portions, and an air residue is generated between the center portion of the tread rubber member and the tire case. Therefore, it is possible to provide a tread application device that can suppress the occurrence of poor tire quality.

It is a front view which shows a tread sticking apparatus typically. It is a figure explaining the cross-sectional shape of the tread rubber member mounting part of the tread molding servicer in the tread sticking apparatus which concerns on the 1st Embodiment of this invention. It is a figure explaining the cross-sectional shape of the tread rubber member loading part of the tread molding servicer in the tread sticking device concerning the 2nd embodiment of the present invention. It is a figure explaining the cross-sectional shape of a tread rubber member.

1. SUMMARY OF THE INVENTION A tread application device according to the present invention is a tire case comprising a plurality of types of rubber sheets molded on a molding drum by supplying a sheet-like tread rubber member to the molding drum using a tread molding servicer. In the point which affixes a tread rubber member, it is the same as that of the conventional tread sticking apparatus.

  However, the tread application device according to the present invention is different from the conventional tread application device in that both side edges of the tread rubber member loading portion of the tread molding servicer are formed above the center portion. .

  That is, in the conventional tread application device, the tread rubber member stacking portion of the tread molding servicer is flat and the bottom surface of the tread rubber member is also flat. Was supplied in parallel to the outer peripheral surface of the forming drum. However, in the case of a tread rubber member with thick gauges on both side edges, the both side edges of the tread rubber member are lowered by its own weight during the supply from the tread molding servicer to the molding drum, and on the molding drum before the center. There is a possibility that an air residue may be generated between the central portion of the tread rubber member and the tire case when the tire is vulcanized.

  On the other hand, in the tread application device according to the present invention, since the both side edges of the tread rubber member loading part of the tread molding servicer are formed to be higher than the center part, the gauges on both side edges are thick. It is a tread rubber member, and even if both side edges of the tread rubber member are lowered by its own weight during supply to the molding drum, the both side edges may be supplied to the molding drum in a state of being lowered below the center part. Absent.

  For this reason, it becomes possible to reliably attach the center portion of the tread rubber member to the tire case on the molding drum before the side edge portions, and between the center portion of the tread rubber member and the tire case during tire vulcanization. The occurrence of remaining air can be suppressed.

2. Hereinafter, the present invention will be described with reference to the drawings based on the embodiments.

  FIG. 1 is a front view schematically showing a tread application device, and FIG. 2 is a view for explaining a cross-sectional shape of a tread rubber member loading portion of a tread molding servicer in the tread application device according to the first embodiment.

  As shown in FIG. 1, a tread application device 1 according to the present embodiment is a tire case in which a sheet-like tread rubber member T is supplied to a forming drum 3 and formed on the forming drum 3 as in the prior art. The tread molding servicer 2 includes a tread rubber member stacking portion 4 on which a tread rubber member T is stacked.

  The tread rubber member stacking unit 4 is configured by a belt type conveyor, and the tread rubber member T is stacked on the upper surface (rubber member stacking surface) 5 of the belt and conveyed toward the molding drum.

  In the present embodiment, the tread rubber member stacking portion 4 of the tread molding servicer 2 is formed such that both side edge portions 5a are positioned above the central portion 5b as in the cross-sectional shape shown in FIG. . Specifically, the upper edge 5 of the tread rubber member stacking portion 4 is curved in an arc shape so that the side edge portions 5a are positioned above the central portion 5b.

  When the tread application device 1 provided with the tread molding servicer 2 having such a configuration is used to transport the tread rubber member T formed so that the gauge of the side edge portion T1 is thicker than the gauge of the central portion T2, As described above, the upper surface 5 of the tread rubber member stacking portion 4 is formed to be curved in an arc shape so that both side edges 5a of the tread rubber member stacking portion 4 are located above the central portion 5b. The tread rubber member T is conveyed such that both side edge portions T1 of the tread rubber member T are positioned above the central portion T2.

  Thus, unlike the conventional tread application device in which the upper surface of the tread rubber member stacking portion is flat, both sides of the tread rubber member T are supplied while the tread rubber member T is supplied from the tread molding servicer 2 to the molding drum 3 (see FIG. 1). Even if the edge portion T1 is lowered by its own weight, the center portion T2 comes into contact with the tire case on the molding drum 3 before the both side edge portions T1, so that the center portion T2 of the tread rubber member T is connected to the both side edge portions T1. Can be pasted before.

  As a result, it is possible to prevent an air residue from occurring between the central portion T2 of the tread rubber member T and the tire case, and to suppress occurrence of a tire quality defect due to the air residue during tire vulcanization.

  The radius of curvature R of the upper surface 5 of the tread rubber member stacking portion 4 is appropriately adjusted so that the central portion T2 of the tread rubber member T comes into contact with the tire case on the molding drum 3 before both side edge portions T1. It is preferable that it is 500-1000 mm. When the radius of curvature R is less than 500 mm, the degree of curvature becomes too large, the contact area at the time of pasting is small, and it becomes easy to meander, and the tread center and the forming drum center may shift (OFF / C: off center). is there. On the other hand, when the radius of curvature R exceeds 1000 mm, the degree of curvature becomes too small, the upper surface 5 of the tread rubber member stacking portion 4 becomes nearly flat, and both side edges T1 of the tread rubber member T are in the center. There is a risk of being pasted before T2.

3. FIG. 3 is a diagram illustrating a cross-sectional shape of a tread rubber member stacking portion of a tread molding servicer in the tread application device according to the second embodiment of the present invention.

  In the first embodiment described above, the upper surface 5 of the tread rubber member stacking portion 4 is curved in an arc shape so that both side edge portions T1 of the tread rubber member T are positioned above the center portion T2. The tread rubber member T is conveyed (see FIG. 1).

  On the other hand, in the second embodiment, the central portion 5b of the tread rubber member stacking portion 4 is formed flat, and inclined surfaces rising at a predetermined inclination angle are formed on both side edge portions 5a. Yes.

  Even in such a case, since the tread rubber member T can be transported so that both side edge portions T1 of the tread rubber member T are located above the central portion T2, the tread rubber member T is placed on the molding drum. Even if both side edge portions T1 of the tread rubber member T are lowered by its own weight during the supply of the tire, the center portion T2 of the tread rubber member T is pasted before the both side edge portions T1, and the air remains during tire vulcanization. The occurrence of tire quality defects can be suppressed.

  In addition, it is preferable that the area | region L in which the inclined surface is formed is an area | region of 500-800 mm toward the center part from the both-sides edge of the tread rubber member stacking part 4. If it is less than 500 mm, the region L where the inclined surface is formed becomes too small, and there is a possibility that the central portion T2 of the tread rubber member T cannot be pasted before the side edge portions T1. On the other hand, if it exceeds 800 mm, the contact area at the time of pasting is small and it becomes easy to meander, and the tread center and the forming drum center may shift (OFF / C).

  Moreover, it is preferable that the inclination angle θ of the inclined surface formed on the side edge portions 5a of the tread rubber member stacking portion 4 is set to 20 ° or more. When the angle is less than 20 °, the upper surface 5 of the tread rubber member stacking portion 4 becomes nearly flat, and there is a possibility that the central portion T2 of the tread rubber member T cannot be pasted before the side edge portions T1. More preferably, the angle is 20 to 25 °.

1. Examples and Comparative Examples (1) Examples 1 to 3
A tread rubber member T having a top surface 5 of the tread rubber member stacking portion 4 as shown in FIG. 2 curved with a predetermined radius of curvature R is used to form a tread rubber member T having a cross section as shown in FIG. A snow tire having a size of 185 / 65R15 was prepared by sticking to the case (N = 500). In Examples 1 to 3, the curvature radius R of the upper surface 5 is different as shown in Table 1.

(2) Comparative Example Tires were produced under the same conditions as in Examples 1 to 3, except that a conventional tread application device having a flat upper surface of the tread rubber member loading portion was used.

2. Evaluation (1) Presence / absence of sticking failure For each of the produced tires, the presence / absence of sticking failure in the central portion of the tread rubber member was visually observed. The results are shown in Table 1.

(2) A / UT incidence The A / UT incidence was calculated by measuring whether or not A / UT (air / undertread) occurred in each of the manufactured tires. The results are shown in Table 1.

  From Table 1, in Examples 1 to 3, no sticking failure based on the crimping failure of the central portion of the tread rubber member has occurred, and the occurrence rate of A / UT is reduced as compared with the comparative example. I understand that Accordingly, the tread rubber member stacking portion 4 is curved, and the tread rubber member T is conveyed so that both side edge portions T1 of the tread rubber member T are located above the central portion T2, thereby the tread rubber member T is conveyed. It has been confirmed that the occurrence of poor pasting of the central portion T2 of the rubber member T can be suppressed.

  Moreover, it has confirmed that the incidence rate of A / UT could be reduced more appropriately by setting the curvature radius R in the range of 500 to 1000 mm as in Example 1 and Example 2.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Tread sticking apparatus 2 Tread molding servicer 3 Molding drum 4 Tread rubber member stacking part 5 Upper surface 5a Both side edges 5b of the tread rubber member stacking part L Central part L of the tread rubber member stacking part Area R where the inclined surface is formed T tread rubber member T1 Tread rubber member side edges T2 tread rubber member center θ Inclination angle

Claims (4)

By supplying a sheet-like tread rubber member to a molding drum using a tread molding servicer, a tread pasting device for pasting the tread rubber member on a tire case molded on the molding drum,
The tread application device, wherein both side edge portions of the tread rubber member stacking portion of the tread molding servicer are formed above the center portion of the tread rubber member stacking portion.   The tread rubber member stacking portion is formed to be curved in an arc shape so that both side edges of the tread rubber member stacking portion are above the center portion of the tread rubber member stacking portion, and the radius of curvature thereof is It is 500-1000 mm, The tread sticking apparatus of Claim 1 characterized by the above-mentioned. The center portion of the tread rubber member loading portion is formed flat,
An inclined surface rising at a predetermined inclination angle toward the outer side in the width direction is formed starting from a position of 500 to 800 mm from both side edges of the tread rubber member stacking portion toward the center side. The tread sticking apparatus according to claim 1.   The tread application device according to claim 3, wherein an inclination angle of the inclined surface is 20 ° or more.

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