JP2006159744A - Turn-up method in inflate molding machine for pneumatic tire and its turn-up apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turn-up method in an inflate molding machine which can prevent uneven elongation in the tire circumferential direction and suppress the unevenness of a side member by minimizing the friction between a turn-up arm and the side member and its turn-up apparatus. <P>SOLUTION: A guide roller 2 is fitted to the tip of the turn-up arm 10, its base end part is fitted rotatably to the fulcrum 4 of a slide member 3 mounted on a base member 11, and the slide member 3 is constituted slidably in the arrow direction by a driving device. In the turn-up arm 10, the tip side having the guide roller 2 of the turn-up arm 10 is formed upward in a prescribed length L and at a prescribed inclination α. In this way, the contact area between the upper surface of the turn-up arm 10 and a side member Wx is reduced during the turn-up of the side member Wx, friction is reduced, and the turn-up of the side member Wx is carried out smoothly. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a turn-up method and a turn-up apparatus in an inflation molding machine for pneumatic tires, and more specifically, in a mechanical turn-up type molding machine, reducing friction between a side member and a turn-up arm, The present invention relates to a turn-up method and a turn-up device for a pneumatic tire inflation molding machine that can prevent unevenness of the side member in the circumferential direction and suppress unevenness of the side member.

  Conventionally, a pneumatic tire inflation molding machine includes a method of using a bladder when turning a side member such as a side tread, and a metal arm or the like arranged in a large number at predetermined intervals in the circumferential direction of the tire. A mechanical turn-up method is known in which the side tread is turned up by expanding (see, for example, Patent Document 1).

  However, the former method using a bladder has a problem that the bladder mainly uses a rubber material, so that there are problems with changes over time, temperature dependence of physical properties, durability, poor maintainability, and low repeatability. there were. In addition, for tire sizes with large tire outer diameters such as trucks and buses, a huge bladder is required to turn up the entire side tread. The current situation is that there are still many issues to be solved.

  On the other hand, in the latter mechanical turn-up method, as shown in FIGS. 8 to 10, the turn-up arm 1 having a guide roller 2 rotatably attached to the tip can be turned around a fulcrum 4 provided on a slide member 3. The side tread Wx is turned up and pasted so that the bead B is wrapped around the side part of the green tire W by sliding the slide member 3 in the direction of the arrow. This mechanical turn-up method is superior to the method using a bladder, and it is clear that turn-up can be realized with a relatively compact structure even with a large outer diameter, and maintenance and repeatability are also high. ing.

  However, since this mechanical turn-up system expands the diameter of the turn-up arm 1, as the diameter increases, the tip of each turn-up arm 1 moves away from each other, and the side tread edge is a polygon that is equal to the number of turn-up arms. It is easy to become. This is because the length of the turn-up arm 1 is long in order to correspond to a large diameter, the main shaft rigidity of the molding machine is ensured, and the turn-up arm 1 is linear in order to prevent buckling of the arm itself. This is particularly noticeable in the structure.

  This is because the turnup arm 1 and the side tread Wx interfere with each other in the region Q during the turnup and the frictional resistance increases, and the radial extension of the side tread Wx increases. It is estimated that non-uniformity occurs in the direction.

  As a means for preventing this, a method of bending the turn-up arm 1 so as not to interfere with the side tread Wx is conceivable. However, the main shaft of the shaping drum body in the inflation molding machine becomes thin and the strength cannot be maintained. In addition, the turn-up arm is required to have sufficient strength to withstand buckling, and there is a problem that the apparatus becomes large.

  Therefore, the inventors of the present application, such as stearic acid for the purpose of preventing the side tread Wx from extending in the radial direction in order to reduce the frictional force as much as possible even when the turn-up arm 1 and the side tread Wx interfere with each other. When applied to the turn-up arm 1 as a lubricant or formed by adhering a Teflon sheet to the turn-up arm 1, the radial extension is minimized even if the turn-up arm 1 and the side tread Wx interfere with each other. It turns out that it can be suppressed.

However, it takes a lot of labor and time to apply the lubricant to the turn-up arm 1 and the maintenance is poor because it deals with foreign matter. Dirt adheres to the surface, and the frictional force increases, which also has a problem of poor maintainability.
JP 2002-46189 A

  This invention pays attention to such a conventional problem, and in a mechanical turn-up type inflation molding machine, when expanding the diameter of the turn-up arm, the friction between the turn-up arm and the side member is reduced as much as possible. Provided is a turn-up method and a turn-up device for a pneumatic tire inflating machine that can smoothly turn a member, prevent uneven elongation in the tire circumferential direction, and suppress unevenness of a side member. It is for the purpose.

  SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a turn-up method for a pneumatic tire inflating machine according to the present invention, wherein when a side member is wound up, the friction between the side member and the turn-up arm is reduced. It is what.

  Further, the turn-up device in the pneumatic tire inflation molding machine of the present invention is that the tip end side of the turn-up arm provided with the guide roller is formed upward with a predetermined length and a predetermined inclination angle. It is a summary.

  Here, the inclination angle is set in a range of 15 ° to 60 °, and the length of the tip side of the turn-up arm formed upward is set to 100 mm to 500 mm from the tip portion of the turn-up arm. It is.

  Further, the tip of the turn-up arm may be curved or substantially L-shaped, and a plurality of guide rollers may be arranged in tandem at a predetermined interval on the tip of the turn-up arm. Is possible. Further, the cross section of the guide roller can be shaped so that the contact area with the side member is small, and a plurality of rotatable guide pulleys are spaced at a predetermined interval on the tip side of the turn-up arm. In addition to being arranged in a column, it is also possible to configure the guide pulley that is positioned at least on the front and rear sides of the guide pulley by wrapping an endless guide belt.

  In this way, in the mechanical turn-up type molding machine, the friction between the side member and the turn-up arm is reduced, the side member is prevented from unevenly extending in the circumferential direction, and the unevenness of the side member is suppressed. Is something you can do.

  Since the present invention is configured as described above, in the mechanical turn-up type inflation molding machine, when the diameter of the turn-up arm is increased, the friction between the turn-up arm and the side member is reduced as much as possible, so that the side member As a result, it is possible to smoothly perform the turn-up, to prevent uneven elongation in the tire circumferential direction, and to suppress the unevenness of the side member. Further, the structure of the device itself is simple and can be manufactured at low cost, and it is not necessary to give the turnup arm strength, and there is an effect that the device can be made simple.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Note that the same components as those in the conventional example are denoted by the same reference numerals and description thereof is omitted.

  FIG. 1 is a partial side view of a mechanical turn-up device for carrying out a turn-up method according to a first embodiment of the present invention. FIG. 2 is a state diagram of a side member Wx before turn-up, and FIG. FIG. 3 shows a perspective view of a turn-up arm 10 according to the first embodiment of the present invention. The turn-up arm 10 is attached to a tire forming drum (not shown). In addition, a large number (around 30 in this embodiment) are arranged at predetermined intervals with respect to the circumferential direction of the green tire W.

  A guide roller 2 is rotatably attached to the distal end of the turn-up arm 10, and a base end portion of the turn-up arm 10 is pivotally attached to a fulcrum 4 of a slide member 3 placed on a base member 11, and further slides. The member 3 is configured to be slidable in the arrow direction by a driving device such as a cylinder (not shown).

  Further, as shown in FIG. 3, the turn-up arm 10 is formed such that the tip end side of the turn-up arm 10 provided with the guide roller 2 is formed upward with a predetermined length L and a predetermined inclination angle α. With this configuration, when the side member Wx is turned up, the contact area between the upper surface of the turnup arm 10 and the side member Wx is reduced, and friction is reduced as much as possible. It is performed smoothly and prevents uneven elongation in the tire circumferential direction.

  The base member 11 is formed with a recess 11a for accommodating a portion formed upward at a predetermined inclination angle α on the tip side of the turn-up arm 10, and before the side member Wx is turned up, As shown in FIG. 1, it is comprised so that the front end side of the turnup arm 10 can be accommodated.

  In this embodiment, the inclination angle α of the turn-up arm 10 is set in the range of 15 ° to 60 °, preferably in the range of 25 ° to 35 °. When the angle is less than 15 °, the contact area with the side member Wx becomes large. As a result, there is a problem that the friction increases, and when the angle exceeds 60 °, the shape becomes large.

  Moreover, the length L of the tip side of the turnup arm 10 formed upward is set in a range of 100 mm to 500 mm, preferably 100 mm to 300 mm from the tip of the turnup arm 10. Here, if it is less than 100 mm, it is difficult to smoothly wind up the side member Wx, and if it exceeds 500 mm, the turn-up arm 10 and the side member Wx are likely to interfere with each other.

  Further, in this embodiment, the tip of the turn-up arm 10 is bent in an approximately L shape with an inclination angle α, but is not limited to this embodiment. It is also possible to form.

  Furthermore, although the guide roller 2 is formed in a cylindrical shape or a columnar shape in this embodiment, it can also be formed in a drum shape or a abacus ball shape so that the contact area with the side member Wx becomes small. .

  Next, FIGS. 4 and 5 show a second embodiment of the turn-up arm 10 according to the present invention, which is the tip side of the turn-up arm 10 bent upward in a substantially L shape at an inclination angle α. In addition, a plurality of guide rollers 2a, 2b are arranged in a row at predetermined intervals, and as many guide rollers as possible depend on the length of the tip portion of the turn-up arm 10 at the tip portion. It is desirable to arrange.

  The number of the guide rollers 2 and the diameter of the guide rollers 2 are arbitrarily set according to the size of the tire to be molded and the length and shape of the turn-up arm 10 to be used. In order to prevent the distance between the rollers 2 from becoming too wide, it is desirable to set the diameter in a range of 20 mm to 70 mm. Further, the upper surface of the guide roller 2 needs to protrude from the upper surface of the turnup arm 10 with respect to the center line of the main body spindle, and the protrusion amount is desirably 3 mm or more, for example, 7 mm or more. desirable.

  FIGS. 6 and 7 show a third embodiment of the turn-up arm 10 according to the present invention. This embodiment includes a tip end side of the turn-up arm 10 bent upward in a substantially L shape at an inclination angle α. On the rear end side, rotatable guide pulleys 12a and 12b are arranged in a row at predetermined intervals, and an endless guide belt 13 is wound around the guide pulleys 12a and 12b. .

  It is also possible to drive the guide belt 13 to rotate with a driving force by driving at least one of the guide pulleys 12a and 12b. In this embodiment, as in the first and second embodiments, the friction between the upper surface of the turnup arm 10 and the side member Wx is reduced as much as possible when the side member Wx is turned up. It is possible to smoothly turn up and prevent uneven elongation in the tire circumferential direction.

  Since other configurations and operations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  By configuring as described above, in a mechanical turn-up type inflation molding machine, when expanding the diameter of the turn-up arm, the friction between the turn-up arm and the side member is reduced as much as possible to reduce the turn-up of the side member. Smooth, can prevent uneven stretch in the tire circumferential direction, can suppress the unevenness of the side members, the structure of the device itself is simple and can be manufactured at low cost, and the turn-up arm has strength It is not necessary and can be a simple device.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partial side view of the mechanical turnup apparatus for enforcing the turnup method in 1st Embodiment of this invention, and is a state figure before the turnup of a side member. It is a partial side view of the mechanical turn-up device in the turn-up of the side member. It is a perspective view of the turn-up arm in 1st Embodiment of this invention. It is a partial side view of 2nd Embodiment of the mechanical turnup apparatus before the turnup of a side member. It is a partial side view of the mechanical turn-up device in the turn-up of the side member in 2nd Embodiment. It is a partial side view of 3rd Embodiment of the mechanical turnup apparatus before the turnup of a side member. It is a partial side view of the mechanical turn-up device in the turn-up of the side member in 3rd Embodiment. It is a partial side view of the conventional mechanical turn-up device, and is a state diagram before turn-up of the side member. It is a partial side view of the mechanical turn-up device during the turn-up of the conventional side member. It is a perspective view of the conventional turn-up arm.

Explanation of symbols

1 Turnup arm 2 Guide roller 3 Slide member 4 Support point W Green tire Wx Side member (side tread)
B bead Q region 10 turn-up arm 11 base member 11a recess 2a, 2b guide roller 12a, 12b guide pulley 13 guide belt

Claims (8)

In a turn-up method in an inflation molding machine for a pneumatic tire that winds and press-bonds a side member via a plurality of turnable turn-up arms having a guide roller at a tip portion on a side portion of an unvulcanized tire,
A turn-up method in an inflation molding machine for pneumatic tires, wherein the side member is wound up while reducing friction between the side member and the turn-up arm. In a turn-up device in an inflation molding machine for a pneumatic tire that winds up a side member through a turnable turn-up arm provided with a guide roller at a tip portion on a side portion of an unvulcanized tire,
A turn-up device in an inflation molding machine for a pneumatic tire, wherein a tip end side of the turn-up arm having a guide roller is formed upward with a predetermined length and a predetermined inclination angle. The turn-up device in an inflation molding machine for a pneumatic tire according to claim 2, wherein the inclination angle is set in a range of 15 ° to 60 °. The turn-up device in the inflation molding machine for a pneumatic tire according to claim 2 or 3, wherein the length of the tip side of the turn-up arm formed upward is set to 100 mm to 500 mm from the tip of the turn-up arm. The turn-up device in an inflation molding machine for a pneumatic tire according to claim 2, 3 or 4, wherein the shape of the tip of the turn-up arm is curved or substantially L-shaped. 6. The turn-up device in an inflation molding machine for pneumatic tires according to claim 2, 3, 4 or 5, wherein a plurality of guide rollers are arranged in a row at predetermined intervals on the front end side of the turn-up arm. 7. The turn-up device in an inflation molding machine for a pneumatic tire according to claim 2, wherein a cross section of the guide roller has a shape that reduces a contact area with a side member. A plurality of rotatable guide pulleys are arranged in tandem at a predetermined interval on the distal end side of the turn-up arm, and an endless guide belt is hung on the guide pulley located at least on the front and rear sides of the guide pulley. The turn-up device in a pneumatic tire inflation molding machine according to claim 2, 3, 4, 5, 6 or 7.

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