JP2009269288A - Turnup device and method of rubber member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turnup device and method of a rubber member, which allow the beading part of a beading member and the rubber member to adhere tightly not to gap when the end of the rubber member turns up so as to lap the beading member. <P>SOLUTION: The projection of a pressing part 4 in a drum radial direction to the outside from a mounting part 3 prevents the deviation of a drum axis direction of the beading part 12a mounted on the mounting part 3 pressed by a lifting lever. Further, a covering material 8 integrated with a mounting part covering rubber 3a provided so as to cover the surfaces of the mounting part 3 and the pressing part 4, which have a step, is extended to give a tension. The covering material 8 is biased along the beading part 12a to improve the adhesiveness of the beading part 12a with the rubber member 11 located above the covering material 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a rubber member turn-up device and method, and more particularly, close contact between a bead portion of a bead member and a rubber member so as not to cause a gap when the end portion of the rubber member is folded so as to wrap the bead member. The present invention relates to an apparatus and method for turning up a rubber member.

  When forming a pneumatic tire, a bead member is set so as to be externally fitted at a predetermined position of an end of a rubber member such as a carcass layer wound around a forming drum, and the bead member is set so as to wrap the bead member. A so-called turn-up process is performed in which the end portion of the rubber member in the range outside the drum axis direction is pressed against the inflated rubber member in the range inside the drum axis direction.

  As the turn-up method, the end of the rubber member outside the drum axial direction from the set position of the bead member is folded back and pressed by an expanding bladder (bladder method), and the end is turned back by a rigid push-up lever. A pressing method (mechanical method) is known. Since the bladder method uses a bladder that is easily deformed when pressed, in the case of a highly rigid rubber member, the end of the rubber member is folded back so as to wrap the bead member and the bead member and the rubber member are sufficiently adhered to each other. I can't. As described above, if there is a gap between the two without sufficiently adhering, the quality of the manufactured tire is adversely affected.

On the other hand, in the mechanical system, a rigid push-up lever that does not deform when pressed is used, which is more advantageous than the bladder system in turning up a highly rigid rubber member (see, for example, Patent Document 1). However, even in the mechanical system, it is difficult to fold back the rubber member around the bead portion of the bead member having relatively high rigidity so that the bead portion and the rubber member are in close contact with each other so that no gap is generated. In particular, there is a problem that a gap tends to be generated in the range of the bead portion on the inner side in the drum axis direction because the push-up lever cannot be pressed directly.
Japanese Patent Laid-Open No. 7-60865

  An object of the present invention is to provide a rubber member turn-up device and method capable of bringing the bead portion of the bead member into contact with the rubber member so as not to cause a gap when the end portion of the rubber member is folded back so as to wrap the bead member. It is to provide.

  In order to achieve the above object, the rubber member turn-up device according to the present invention includes a bead set portion provided along a drum circumferential direction at a predetermined position in the drum axial direction of a molding drum, and a plurality of drum member turn-up devices provided at a predetermined pitch in the drum circumferential direction And a rear end portion of the push-up lever arranged on the outer side in the drum axis direction than the bead set portion is provided so as to be movable in the drum axis direction. In the rubber member turn-up device in which the tip end portion of the lever is movable in the drum radial direction, the bead setting portion includes a placement portion for placing the bead portion of the bead member, and an inner side in the drum axis direction of the placement portion. A pressing part that moves in the drum radial direction at a position and can protrude outward in the drum radial direction from the mounting part, and a covering material that has stretchability to cover these surfaces across the mounting part and the pressing part Form, is characterized in that it has a portion covering the rubber and one piece mounting attached to the surface of the mounting portion of this covering material.

  Here, the drum axial cross section of the surface of the mounting portion cover rubber is formed into a two-step inclined surface shape, and the inclined surface on the outer side in the drum axial direction of the two-step inclined surface shape is placed on the mounting portion. It can also be set to be parallel to the opposing bottom surface.

  In the rubber member turn-up method of the present invention, the bead member is set so as to be externally fitted at a predetermined position of the end portion of the rubber member wound around the molding drum, and the drum member is set to the outside in the drum axial direction from the set position of the bead member. The plurality of push-up levers provided at a predetermined pitch in the circumferential direction of the drum fold back the end of the rubber member in the range outside the drum axial direction from the set position of the bead member so as to wrap the bead member, and from the set position of the bead member In the method for turning up a rubber member to be pressure-bonded to a rubber member in an inner region in the drum axial direction, a bead setting portion for the bead member, a placement portion for placing the bead portion of the bead member, and a drum of the placement portion It is composed of a pressing portion that moves in the axial direction of the drum in the axial direction of the drum, and a stretchable covering material that covers these surfaces across the placement portion and the pressing portion, When the bead portion is placed on the placement portion covered with the placement portion cover rubber integrated with the covering material, the pressing portion protrudes outward in the drum radial direction from the placement portion and tension is applied to the covering material. And the covering material is adapted to be along the bead portion.

  Here, a plurality of types of coating materials having different surface shapes of the placement unit cover rubber are prepared, and the plurality of types are changed according to the shape of the bead portion placed on the placement unit. One kind of coating material selected from these coating materials can also be used.

  According to the present invention, when the end portion of the rubber member is turned up so as to wrap the bead member by the push-up lever, the pressing portion protrudes outward in the drum radial direction from the mounting portion, so that the mounting portion is Deviation in the drum axis direction of the placed bead portion can be prevented. Therefore, even a rubber member around the bead portion having relatively high rigidity can be folded back and closely attached to the bead portion without a gap.

  Furthermore, by projecting the pressing portion, a step is generated on the surface of the placement portion and the pressing portion, and the covering material covering these surfaces is extended and tension is applied. And the coating | coated material to which tension was provided is urged | biased along the bead part mounted in the mounting part. The rubber member on the covering material and the bead portion are pressure-bonded by this urging force, so that the adhesion to the rubber member is also possible in the drum shaft inner side range where the push-up lever cannot be pressed directly. Can be improved.

  Hereinafter, a rubber member turn-up device and method according to the present invention will be described based on an embodiment shown in the drawings, taking a case where a pneumatic tire is molded as an example.

  A rubber member turn-up device 1 (hereinafter referred to as “turn-up device 1”) of the present invention illustrated in FIGS. 1 to 3 is provided on a forming drum 10 and is a pair of objects with respect to the center of the forming drum 10 in the drum axial direction. It has a structure. Thus, since it is a left-right symmetric structure, only the turn-up device 1 on one side (right side) of the pair will be described in the drawings.

  This turn-up device 1 is a so-called mechanical turn-up device including a bead setting unit 2 and a plurality of push-up levers 5. The bead setting unit 2 is installed at a predetermined position in the drum axial direction of the forming drum 10 along the circumferential direction of the drum. The mounting unit 3 and a pressing unit 4 provided at an inner position in the drum axial direction of the mounting unit 3 The covering member 8 is formed of a stretchable covering material 8 that covers the surface of the mounting portion 3 and the pressing portion 4. The covering material 8 is integrated with the placement portion cover rubber 3 a attached to the surface of the placement portion 3.

  That is, one end portion of the covering material 8 is fixed to the placement portion 3 by a placement portion cover rubber 3a fitted in a fitting groove formed on the surface of the placement portion 3, and the other end portion is a pressing portion. 4 is sandwiched and fixed by a guide portion 4a disposed inside the drum axis direction 4 and a clamp portion 9 that is bolted to the guide portion 4a. Therefore, the covering material 8 can be easily replaced, and replacement work for a new covering material 8 due to damage and replacement work for a different type of covering material 8 can be quickly performed.

  The covering material 8 is formed of a stretchable material, for example, rubber, resin, fiber, or a composite material thereof. The thickness of the placement portion cover rubber 3a is, for example, 20 mm to 30 mm, and the thickness of the covering material 8 excluding the placement portion cover rubber 3a is, for example, about 0.5 mm to 2 mm.

  The pressing portion 4 disposed between the placing portion 3 and the guide portion 4a moves in the drum radial direction so as to be orthogonal to the drum axial direction. In addition, the holding | suppressing part 4 moves independently in the drum radial direction independently of the mounting part 3 and the guide part 4a.

  Each push-up lever 5 is a rigid body made of metal or resin, has a pressing roller 5a at the tip, and a slide mechanism 6 that is supported by the rotating shaft 5b and moves in the drum axis direction. It is connected. As illustrated in FIG. 2, two types of push-up levers 5 having different lengths are arranged in the drum circumferential direction. The push-up levers 5 are provided, for example, at an equal pitch with a center angle of about 2 ° to 5 ° in the drum circumferential direction.

  On the back surface (outer peripheral surface) of each push-up lever 5, three annular tightening rubber bands 7 provided at a predetermined pitch in the circumferential direction of the drum are fitted so as to cross the push-up lever 5. . The push-up levers 7 are urged by the tightening rubber bands 7 in the drum inner circumferential direction. Therefore, when the tip of the push-up lever 5 is moved in the drum outer peripheral direction, the urging force by the tightening rubber band 7 becomes the push force of the push-up lever 5 (pressing roller 5a).

  The number of the tightening rubber bands 7 is not particularly limited, and a plurality of the tightening rubber bands 7 can all have the same urging force, or can have different urging forces. The tightening rubber band 7 can be replaced with an annular spring or the like.

  Hereinafter, the procedure of the rubber member turn-up method using the turn-up device 1 will be described.

  First, the rubber member 11 is wound around the outer peripheral surface of the molding drum 10. In tire manufacture, the rubber member 11 is an inner liner, a carcass material 13, a side rubber, or the like.

  Next, the ring-shaped bead member 12 is set so as to be fitted around the outer peripheral position of the bead set portion 2 which is a predetermined position of the end portion of the rubber member 11 wound around the molding drum 10. Specifically, as illustrated in FIG. 4, the bead member 12 is set by placing the bead portion 12 a on the placement portion 3 covered with the placement portion cover rubber 3 a integrated with the covering material 8. In tire manufacture, the bead member 12 includes a bead portion 12a and a bead filler 12b attached to the outer periphery of the bead portion 12a.

  In the present invention, when the bead portion 12 a is placed on the placement portion 3, the pressing portion 4 protrudes outward in the drum radial direction from the placement portion 3. Then, the pair of bead setting portions 2 are moved in the drum axis direction so that they are close to each other, and the drum shaft direction central portion of the rubber member 11 is inflated. Further, the slide mechanism 6 is moved inward in the drum axis direction. Along with this, the rear end portion of the push-up lever 5 moves inward in the drum axis direction outside the bead set portion 2, and the tip end portion of the push-up lever 5 rotates the rotary shaft 5b. As the center moves outward in the drum radial direction, the push-up lever 5 spreads radially as illustrated in FIG.

  The pressing roller 5 a that moves outward in the drum radial direction folds back the end portion of the rubber member 11 in a range outside the drum shaft direction from the set position of the bead member 12 so as to wrap the bead member 12. Even if the rigidity of the rubber member 11 around the bead portion 12a, which is the base point of the folding, is high, the bead portion 12a is displaced in the drum axis direction by using the rigid push-up lever 5 and the protruded pressing portion 4. Therefore, the end portion of the rubber member 11 can be reliably folded back. Subsequently, the folded rubber member 11 is pressed by the pressing roller 5a.

  In this manner, the end of the rubber member 11 in the range outside the drum shaft direction from the set position of the bead member 12 is set to the end of the rubber member 11 in the range inside the drum axis direction from the set position of the bead member 12 and the bead member 12. Crimp to. The rubber member 11 around the relatively rigid bead portion 12a is also pressed by the push-up lever 5 (pressing roller 5a), and the bead portion 12a is displaced in the drum axis direction by the protruding pressing portion 4. Can be pressed more strongly than the bladder method or the conventional mechanical method. As a result, the rubber member 11 can be brought into close contact with the periphery of the bead portion 12a where a gap is likely to occur without generating a gap.

  Further, in the present invention, as the pressing portion 4 protrudes, the covering material 8 covering the placing portion 3 and the pressing portion 4 where the step is generated is stretched and tension is applied, and the inside of the bead portion 12a. It is energized along the side. Therefore, the rubber member 11 and the bead portion 12a on the covering material 8 are pressure-bonded by this urging force, and the adhesion between them can be improved. That is, the adhesion with the rubber member 11 can be improved also in the drum shaft direction inner side range of the bead portion 12a where the push-up lever 5 (pressing roller 5a) cannot be pressed directly.

  Since the covering material 8 is urged and closely adheres to the rubber member 11 around the bead portion 12a, it exhibits an excellent sealing function as a sealing material for inflating the rubber member 11.

  Further, since the pressing portion 4 moves in the drum radial direction so as to be orthogonal to the drum axial direction, the space required for the pressing portion 4 can be minimized. Therefore, the degree of freedom in designing the inner space in the drum axial direction can be made larger than that of the bead set portion 2.

  Since the shape of the bead portion 12a is not one type but various shapes, it is preferable to prepare a plurality of types of covering materials 8 having different surface shapes (cross-sectional shapes) of the placement portion cover rubber 3a in advance. Then, the covering material 8 is changed according to the shape (cross-sectional shape) of the bead portion 12a placed on the placing portion 3, and one kind of covering material selected from the prepared plural kinds of covering materials 8 is used. To do.

  For example, as illustrated in FIG. 5, the drum-axis cross section of the surface of the mounting portion cover rubber 3 a is formed into a two-step inclined surface shape, and the two-step inclined surface-shaped outer inclined surface in the drum axial direction is mounted. It sets so that it may become parallel to the bottom face which the bead part 12a mounted in the part 3 opposes. Thereby, the bead part 12a can be hold | maintained more stably, and the crimping | compression-bonding property of the rubber member 11 and the bead member 12 can further be improved.

  In the present invention, the rubber member 11 can be turned up directly by the push-up lever 5 without the pressing roller 5a. Further, the present invention can be applied not only to the formation of a tire but also to the case where the end portion of the rubber member 11 is turned up so as to wrap the bead member 12 in a manufacturing process of a rubber product other than the tire.

It is sectional drawing which illustrates the principal part of the turnup apparatus of this invention. FIG. 2 is a schematic view taken along arrow A in FIG. 1. It is sectional drawing which expands and shows the bead set part of FIG. It is sectional drawing which illustrates the bead set part at the time of setting a bead part. It is sectional drawing which shows the modification of the mounting part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turn-up device 2 Bead set part 3 Place part 3a Cover rubber part 4 Press part 4a Guide part 5 Push-up lever 5a Press roller 5b Rotating shaft 6 Slide mechanism 7 Clamping rubber band 8 Covering material 9 Clamp part 10 Molding drum 11 Rubber Member 12 Bead member 12a Bead portion 12b Bead filler 13 Carcass material

Claims (4)

  A bead set portion provided at a predetermined position in the drum axial direction of the forming drum along the drum circumferential direction, and a plurality of push-up levers provided at a predetermined pitch in the drum circumferential direction, and outside the bead set portion in the drum axial direction The turn of the rubber member is provided so that the rear end portion of the push-up lever arranged in the shaft can be moved in the drum axial direction, and the tip end portion of the push-up lever can be moved in the drum radial direction with the rear end portion as a rotation center. In the up device, the bead set portion is moved in the drum radial direction at a position on the inner side in the drum axial direction of the placement portion on which the bead portion of the bead member is placed, and outside in the drum radial direction from the placement portion. And a mounting portion that is attached to the surface of the mounting portion. The mounting portion has a stretchable covering material that covers these surfaces across the mounting portion and the pressing portion. Cover Go Turn-up device of the rubber member, characterized in that the monolith with.   The cross section in the drum axis direction of the surface of the mounting portion cover rubber is a two-step inclined surface shape, and the inclined surface on the outer side in the drum axial direction of the two-step inclined surface shape is the bottom surface facing the bead portion mounted on the mounting portion. The rubber member turn-up device according to claim 1, wherein the rubber member turn-up device is set so as to be parallel to each other.   The bead member is set so as to be externally fitted at a predetermined position of the end of the rubber member wound around the molding drum, and a plurality of pitches are provided at a predetermined pitch in the drum circumferential direction outside the set position of the bead member. The end of the rubber member in the range outside the drum axis direction from the set position of the bead member is folded back by the push-up lever so as to wrap the bead member, and the rubber member is set in the range inside the drum axis direction from the set position of the bead member. In the turn-up method of the rubber member to be pressure-bonded, the bead set portion for the bead member is moved in the drum radial direction at a placement portion on which the bead portion of the bead member is placed and an inner position in the drum axial direction of the placement portion. A mounting portion cover rubber comprising a pressing portion, and a covering material having elasticity that covers these surfaces across the mounting portion and the pressing portion, and integrated with the covering material When the bead portion is placed on the covered placement portion, the pressing portion is protruded outward in the drum radial direction from the placement portion, tension is applied to the covering material, and the covering material is placed along the bead portion. A rubber member turn-up method characterized by the above.   A plurality of types of covering materials having different surface shapes of the placement portion cover rubber are prepared, and the covering materials are changed according to the shape of the bead portion placed on the placement portion, and the plurality of types of covering materials are prepared. 4. The method for turning up a rubber member according to claim 3, wherein one type of coating material selected from the above is used.

Images