JP6445917B2 - Raw tire molding equipment - Google Patents

Description

  The present invention relates to a green tire molding apparatus having mechanical winding means.

  When forming a raw tire, a mechanical type has been proposed as a winding means that presses and joins the protruding portion of the case to the toroidal case main body portion while winding it outward in the radial direction around the bead core (for example, (See Patent Documents 1 and 2.)

  As shown in FIG. 8, the conventional mechanical winding means includes a plurality of winding arms a arranged in parallel at intervals in the circumferential direction. The hoist arm a has a rear end in the axial direction pivotally supported by a slide cylinder d that is movable in the axial direction, so that the inner end in the axial direction is directed radially outward from the substantially horizontal reference state Y1. And an arm main body a1 that rises radially and a pressing roller a2 pivotally attached to the inner end in the axial direction. As the slide cylinder d moves inward in the axial direction, each pressing roller a2 moves from the radially inner side to the outer side along the case main body portion c2, and in the process, the case main body is rolled up while the case protruding portion c1 is wound up. The portion c2 is pressed and joined.

  However, in the conventional mechanical system, since the winding arm a rises radially, there is a high possibility that the overlapping portion of the sidewall rubber or the carcass is located between the pressing rollers a2 and a2. As a result, the overlapped portion cannot be pressed firmly by the pressing roller a2, which may cause joint failure.

  In addition, a roller mark is formed on the outer surface of the side wall portion by the pressing roller a2, and this roller mark is formed in the same direction as a bulging caused by the overlapping portion of the carcass. For this reason, the bulgedent appears in an unequal pitch between the roller marks, so that the bulgedent is emphasized and the appearance quality is deteriorated.

JP 2004-268371 A JP 2004-009298 A

  Therefore, the present invention provides a first pressing roller that moves in advance while being displaced toward one side in the circumferential direction toward the radially outer side as a pressing roller, and a circumferentially outward toward the radial direction behind the first pressing roller. Based on the use of a second pressing roller that moves while being displaced in the other direction, the pressing roller can run diagonally across the overlapping portion of the sidewall rubber or carcass, and the overlapping portion can be reliably It is an object of the present invention to provide a raw tire molding apparatus that can suppress the joint failure by suppressing the deterioration of the appearance quality by suppressing the joint failure and making the bulgedent inconspicuous.

The present invention holds a cylindrical tire case including a carcass and sidewall rubber, and inflates a case main body portion between bead cores extrapolated on both sides in the axial direction thereof in a toroid shape, and more than the bead core. A raw tire molding device that winds up the protruding part of the outer case in the axial direction,
Bead lock means for holding a bead core extrapolated to the tire case;
A winding means having a plurality of pressing rollers for pressing and joining the case protruding portion to the toroidal case main body portion while winding the case core radially outward around the bead core; and
The pressing roller is composed of a first pressing roller that moves radially outward along the toroidal case main body portion, and a second pressing roller that moves radially outward after the first pressing roller. ,
Moreover, the first pressing roller moves while being displaced toward one side in the circumferential direction toward the radially outer side, and the second pressing roller moves while being displaced toward the other side in the circumferential direction toward the radially outer side. It is characterized by doing.

In the raw tire molding apparatus according to the present invention, the winding means is
A slide cylinder that can move in and out of the axial direction,
A support ring comprising a first ring part and a second ring part which are rotatable concentrically with each other, and attached to the slide cylinder so as to be integrally movable in the axial direction;
A first arm body having an axially outer end portion pivotally supported by the first ring portion at a pivot point and an axially inner end side being able to rise radially outward, and an axially inner side of the first arm body. A plurality of first arms, which have the first pressing roller pivotally attached to an end portion at a pivot point, and are arranged in parallel at intervals in the circumferential direction;
A second arm body having an axially outer end pivotally supported by the second ring portion at a pivot point, and an axially inner end side being able to rise radially outward, and an axially inner side of the second arm body. A plurality of second arms, which have the second pressing roller pivotally attached to the end portion at a pivot point, and are arranged in parallel at intervals in the circumferential direction;
And a guide plate attached to the slide cylinder,
The guide plate is
It forms a slit shape that curves while curving outward in the radial direction toward one side in the circumferential direction, and when the first arm body is inserted, the first pressing roller is displaced toward the one side in the circumferential direction toward the outer side in the radial direction. A plurality of first guide grooves;
It forms a slit shape that curves while curving outward in the radial direction toward the other side in the circumferential direction, and the second arm body is inserted to shift the position of the second pressing roller toward the outer side in the radial direction toward the outer side in the radial direction. It is preferable to provide a plurality of second guide grooves.

  In the raw tire molding apparatus according to the present invention, it is preferable that the first guide groove is formed on the radially outer side of the second guide groove.

  In the raw tire molding apparatus according to the present invention, it is preferable that the second ring portion is disposed radially inside the first ring portion or axially inside the first ring portion.

  In the raw tire molding apparatus according to the present invention, a distance from the pivot point of the first arm body to the pivot point is greater than a distance from the pivot point to the pivot point of the second arm body. It is preferable.

  In the present invention, as described above, the pressing roller is composed of a first pressing roller that moves in the radial direction in advance, and a second pressing roller that moves in the radial direction after the first pressing roller. Yes. The first pressing roller moves while being displaced toward one side in the circumferential direction toward the outer side in the radial direction, and the second pressing roller moves while being displaced toward the other side in the circumferential direction toward the outer side in the radial direction. .

  Therefore, the first pressing roller and the second pressing roller can run obliquely across the overlapping portion of the sidewall rubber and the carcass ply, respectively, and can reliably press the overlapping portion to suppress joint defects.

  In addition, a rhombus pattern is formed on the outer surface of the sidewall portion so that the roller marks of the first pressing roller and the roller marks of the second pressing roller intersect each other. Therefore, the radial bulging caused by the carcass can be made inconspicuous, and deterioration of the appearance quality can be suppressed. In addition, since the first pressing roller and the second pressing roller travel obliquely, the travel distance becomes longer than when traveling in the radial direction as in the prior art. That is, the pressing area is relatively increased. Therefore, it is possible to reduce the pressing force while maintaining the joint state between the case protruding portion and the case main body portion, and it is possible to further contribute to the suppression of deterioration in the appearance quality, such as making the roller marks themselves inconspicuous.

  Further, the portion pressed by the preceding first pressing roller is sequentially pressed by the second pressing roller, and the first and second pressing rollers move in directions opposite to each other in the circumferential direction. For this reason, it is possible to suppress the arrangement disorder of the carcass cord due to the pressing, and to maintain high uniformity. Moreover, since the air between the case protruding portion and the case main body portion is pressed while being pushed outward in the radial direction, the occurrence of an air pool can be suppressed.

1 is a side view conceptually showing an example of a raw tire molding line in which a raw tire molding apparatus of the present invention is adopted. It is sectional drawing which shows the principal part of a raw tire shaping | molding apparatus schematically. It is sectional drawing which expands and shows a bead lock means. It is a conceptual diagram which shows the locus | trajectory of a movement of a 1st pressing roller and a 2nd pressing roller. It is a side view which shows the pivoting state of a pressing roller. It is a front view which shows the 1st guide groove in a guide plate, and a 2nd guide groove. It is sectional drawing which shows schematically the other Example of a winding means. It is sectional drawing explaining the conventional winding means in a mechanical system.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a side view conceptually showing an example of a raw tire molding line in which the raw tire molding apparatus 1 of the present invention is employed.

  In FIG. 1, a raw tire molding apparatus 1 according to the present embodiment holds a cylindrical tire case 2 including a carcass and sidewall rubber, and is a case between bead cores 50 and 50 that are extrapolated on both sides in the axial direction. The main body portion 2A is inflated in a toroidal shape, and includes a shaping drum 3 that winds up the case protruding portion 2B that is axially outer than the bead core 50.

  Reference numeral 5 in FIG. 1 is a so-called belt drum, and for example, a tread reinforcing cord such as a belt ply and a band ply, and a tread constituent member including a tread rubber are sequentially wound on the outer peripheral surface of the belt drum 5. Thus, the annular tread ring 6 is formed. Reference numeral 7 denotes a so-called band drum. In this example, a cylindrical tire case 2 is formed by sequentially winding tire case constituent members including a carcass and sidewall rubber on the outer peripheral surface of the band drum 7. Form. In addition, as the tire case constituent member, an inner liner rubber, a bead reinforcing layer, a clinch rubber, and the like can be appropriately included depending on the tire structure. In this example, the belt drum 5, the shaping drum 3, and the band drum 7 are arranged in a line on the same axis.

  Reference numeral 8 denotes a so-called tread conveying device which receives the tread ring 6 formed on the belt drum 5 from the belt drum 5 and carries it into a standby position P1 radially outside the shaping drum 3. Reference numeral 9 denotes a so-called tire case conveying device which receives the tire case 2 formed on the band drum 7 from the band drum 7 and transfers it onto the shaping drum 3.

  Next, the shaping drum 3 has a pair of drum portions 10 and 10 that can move relative to each other on the same axis. The tire case 2 is held concentrically across the pair of drum portions 10 and 10.

  As schematically shown in FIG. 2, each drum unit 10 includes a bead lock unit 11 and a winding unit 12. The bead lock means 11 holds the bead core 50 that can be enlarged and reduced in diameter and that is externally inserted into the tire case 2 by the enlarged diameter via the tire case 2. The winding means 12 is disposed on the outer side in the axial direction of the bead lock means 11. The winding means 12 presses and joins the case protruding portion 2B to the case main body portion 2A expanded in a toroidal shape while winding the case protruding portion 2B radially outward around the bead core 50.

  Specifically, the drum unit 10 includes a cylindrical body 14 that is externally held on the support shaft 13 of the shaping drum 3, and the bead lock unit 11 and the winding unit are provided on the cylindrical body 14. 12 are formed. The cylindrical body 14 can be moved in and out of the axial direction via known driving means (not shown).

  As shown in FIG. 3, the bead lock means 11 of this example is arranged between a pair of guide plates 17A and 17B rising from the cylindrical body portion 14 at a right angle to the axial direction, and between the guide plates 17A and 17B. A plurality of bead lock segments 18. The bead lock segments 18 are arranged radially around the axis and guided radially in and out by guide portions (not shown) provided on the guide plates 17A and 17B. A cylinder chamber 19 surrounded by the cylindrical body 14, the guide plates 17A and 17B on the inner and outer sides in the axial direction, and the bead lock segments 18 is a cone that is extrapolated to the cylindrical body 14 and can move in the axial direction. A piston 20 is arranged. The conical surface of the piston 20 pushes up the inclined surface 18a provided at the radially inner end of each bead lock segment 18, whereby each bead lock segment 18 can be moved radially outward. A rubber seat 18b for stably seating the bead core 50 via the tire case 2 is attached to the radially outer end of the bead lock segment 18.

  In the shaping drum 3, after holding the bead core 50, the case body portion 2 </ b> A is expanded in a toroidal shape by filling high-pressure air between the drum portions 10 and 10 while approaching each other.

  Next, as shown in FIG. 2, the winding means 12 has a plurality of pressing rollers that press and join the case protruding portion 2B to the toroidal case body portion 2A while winding the case protruding portion 2B radially outward around the bead core 50. 21 is provided.

  The pressing roller 21 includes a first pressing roller 21A that moves to the outer side in the radial direction along the toroidal case body portion 2A, and a second pressing that moves to the outer side in the radial direction after the first pressing roller 21A. And a roller 21B. As shown in FIG. 4, each first pressing roller 21 </ b> A moves while being displaced toward one side in the circumferential direction toward the outer side in the radial direction, and the second pressing roller 21 </ b> B moves toward the other side in the circumferential direction toward the outer side in the radial direction. Move while shifting to the side. Reference numerals X1 and X2 indicate movement trajectories of the first pressing roller 21A and the second pressing roller 21B.

  As shown in FIG. 2, the winding means 12 of the present example includes a slide cylinder 22, a support ring 23 including a first ring portion 23A and a second ring portion 23B that are attached to the slide cylinder 22, and a first ring portion 23A. A plurality of first arms 24A whose outer ends in the axial direction are pivotally supported, a plurality of second arms 24B whose outer ends in the axial direction are pivotally supported by the second ring portion 23B, and the first arms 24A. And a second guide plate 25 for guiding the second arm 24B.

  The slide cylinder 22 is extrapolated and held by the cylindrical body 14 and can move in and out of the axial direction on the cylindrical body 14. The slide cylinder 22 is moved by appropriate driving means (not shown) using, for example, a cylinder mechanism, a link mechanism, a ball screw mechanism, or the like.

  The support ring 23 is attached to the slide cylinder 22 so as to be movable integrally with the slide cylinder 22 in the axial direction. The support ring 23 includes a first ring portion 23A and a second ring portion 23B, and the first ring portion 23A and the second ring portion 23B are rotatably supported concentrically with each other. That is, the first ring portion 23A and the second ring portion 23B can rotate in directions opposite to each other with respect to the circumferential direction. In this example, the case where the second ring portion 23B is arranged concentrically on the inner side in the radial direction of the first ring portion 23A is shown.

  The first arm 24A includes a first arm body 26A and the first pressing roller 21A. The first arm body 26A has an axially outer end supported by the first ring portion 23A at a pivot point Qa, and is supported so that the axially inner end can rise upward in the radial direction. The Further, the first pressing roller 21A is pivotally attached to the inner end of the first arm body 26A in the axial direction at a pivot point Qb.

  In this example, as shown in FIG. 5, the first pressing roller 21A is attached to the first arm body 26A via a roller holder 27 that can swing around an axis J extending in the longitudinal direction of the first arm body 26A. The roller holder 27 includes a holder portion 27a that rotatably holds the first pressing roller 21A, and a fixed shaft 27b that protrudes along the axis J from the holder portion 27a and attaches to the inner end portion of the first arm body 26A. With The rotational axis j of the first pressing roller 21A is perpendicular to the axis J and offset by a distance K. Thereby, the first pressing roller 21A can roll with the rotation axis j oriented at right angles to the traveling direction (moving direction).

  The second arm 24B includes a second arm body 26B and the second pressing roller 21B. The second arm main body 26B is supported such that its outer end in the axial center direction is pivotally supported by the second ring portion 23B at the pivot point Qa, and the inner end side in the axial center direction can be raised radially outward. Further, the second pressing roller 21B is pivotally attached to the inner end of the second arm body 26B in the axial direction at a pivot point Qb. The second pressing roller 21B is attached to the second arm body 26B via the roller holder 27.

  The linear distance from the pivot point Qa to the pivot point Qb in the first arm 24A is greater than the linear distance from the pivot point Qa to the pivot point Qb in the second arm 24B.

  The first arm 24A and the second arm 24B are parallel to each other with a gap in the circumferential direction. In this example, a case is shown in which they are arranged in parallel at equal pitch intervals in the circumferential direction.

  The guide plate 25 has a disk shape that rises perpendicularly to the axial direction from the slide cylinder 22 and is fixed to the slide cylinder 22 integrally. The guide plate 25 is provided with a plurality of first guide grooves 28A for guiding the first arm 24A and a plurality of second guide grooves 28B for guiding the second arm 24B.

  As shown in FIG. 6, the first guide groove 28 </ b> A has a slit shape that curves while curving from the radially inner side to the outer side in the circumferential direction. This first guide groove 28A is guided along the first guide groove 28A when the first arm body 26A is inserted therethrough. At this time, the first ring portion 23A can follow the first arm body 26A and rotate to one side in the circumferential direction, and as a result, the first pressing roller 21A can travel along the locus X1. .

  Further, the second guide groove 28B has a slit shape extending while curving from the radially inner side to the outer side in the circumferential direction. The second arm groove 26B is guided along the second guide groove 28B when the second arm body 26B is inserted therethrough. At this time, the second ring portion 23B can follow the second arm body 26B and rotate to the other side in the circumferential direction. As a result, the second pressing roller 21B can travel along the locus X2.

  In this example, the first arm body 26A in the insertion region 26Aa where at least the first arm body 26A is inserted through the first guide groove 28A so that the first arm body 26A and the second arm body 26B do not interfere with each other, The second arm body 26B is positioned on the outer side in the radial direction from the second arm body 26B in the insertion region 26Ba through which the second guide groove 28B is inserted. In this example, by providing a bent portion in the first arm main body 26A, the first arm main body 26A in the insertion region 26Aa is positioned more radially outward than the second arm main body 26B in the insertion region 26Ba. The first guide groove 28A is formed on the outer side in the radial direction than the second guide groove 28B.

  At least in the insertion regions 26Aa and 26Ba, the first arm body 26A and the second arm body 26B have a circular cross section so that they can freely move along the first guide groove 28A and the second guide groove 28B. Preferably formed.

  In the winding means 12 configured as described above, the first pressing roller 21A and the second pressing roller 21B move along the trajectories X1 and X2. Therefore, when moving, the overlapping portions of the sidewall rubber and the carcass ply can be crossed obliquely, and the overlapping portions can be reliably pressed to suppress joint defects.

  Moreover, since the rhombus pattern by roller marks is formed on the outer surface of the sidewall portion, the radial bulging can be made inconspicuous. In addition, the travel distance is longer than when traveling in the radial direction as in the prior art. That is, since the pressing area is relatively increased, the pressing force can be reduced while maintaining the joining state between the case protruding portion 2B and the case main body portion 2A. As a result, the roller marks themselves can be made inconspicuous, which can further contribute to the suppression of deterioration in appearance quality.

  In addition, the portion pressed by the preceding first pressing roller 21A is sequentially pressed by the second pressing roller 21B, and the first and second pressing rollers 21A and 21B move in directions opposite to each other in the circumferential direction. For this reason, it is possible to suppress the arrangement disorder of the carcass cord due to the pressing, and it is possible to maintain high uniformity. Moreover, since the air between the case protruding portion 2B and the case main body portion 2A is pushed out while being pushed outward in the radial direction, the occurrence of air accumulation can be suppressed.

  The winding means 12 is provided with an annular contraction band (not shown) having rubber elasticity that surrounds the first arm 24A group and the second arm 24B group and is wound in the circumferential direction. As in the conventional case, the contraction band presses the case protruding portion 2B against the case main body portion 2A by the contraction force, and returns the first arm 24A and the second arm 24B to the radially inner standby position.

  In this example, the case where the number n1 of the first arms 24A is equal to the number n2 of the second arms 24B is shown. However, it is preferable to set the number n1 of the first arms 24A to be larger than the number n2 of the second arms 24B. The reason for this is that, as shown in FIG. 4, on the outer surface of the sidewall portion, only the first pressing roller 21A is provided outside the region Yi pressed by the first pressing roller 21A and the second pressing roller 21B. A region Yo to be pressed is formed. Therefore, by setting the number n1 of the first arms 24A to be larger than the number n2 of the second arms 24B, the bonding strength in the region Yo can be made closer to the region Yi.

  As shown in FIG. 6, the central angle θ1 around the axis i between the radially inner end and the outer end of the first guide groove 28A, and the radially inner end and the outer end of the second guide groove 28B. The center angle θ2 around the axis i is preferably in the range of 10 to 30 degrees.

  FIG. 7 shows another embodiment of the winding means 12. In this example, the second ring portion 23B is disposed on the inner side in the axial center direction of the first ring portion 23A. Also in this case, the first ring portion 23A and the second ring portion 23B are supported so as to be rotatable in directions opposite to each other with respect to the circumferential direction.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

DESCRIPTION OF SYMBOLS 1 Raw tire shaping | molding apparatus 2 Tire case 2A Case main-body part 2B Case protrusion part 11 Bead lock means 12 Winding means 21 Pressing roller 21A 1st pressing roller 21B 2nd pressing roller 22 Slide cylinder 23 Support ring 23A 1st ring part 23B 2nd Ring portion 24A First arm 24B Second arm 25 Guide plate 26A First arm main body 26B Second arm main body 28A First guide groove 28B Second guide groove 50 Bead core Qa pivot point Qb pivot point

Claims (6)

Holds a cylindrical tire case containing carcass and sidewall rubber, and expands the case body part between bead cores extrapolated on both sides in the axial direction in a toroidal shape, and is axially outer than the bead core. Is a raw tire molding device that rolls up the protruding part of the case,
Bead lock means for holding a bead core extrapolated to the tire case;
A winding means having a plurality of pressing rollers for pressing and joining the case protruding portion to the toroidal case main body portion while winding the case core radially outward around the bead core; and
The pressing roller is composed of a first pressing roller that moves radially outward along the toroidal case main body portion, and a second pressing roller that moves radially outward after the first pressing roller. ,
Moreover, the first pressing roller moves while being displaced toward one side in the circumferential direction toward the radially outer side, and the second pressing roller moves while being displaced toward the other side in the circumferential direction toward the radially outer side. A raw tire molding apparatus. The winding means is
A slide cylinder that can move in and out of the axial direction,
A support ring comprising a first ring part and a second ring part which are rotatable concentrically with each other, and attached to the slide cylinder so as to be integrally movable in the axial direction;
A first arm body having an axially outer end portion pivotally supported by the first ring portion at a pivot point and an axially inner end side being able to rise radially outward, and an axially inner side of the first arm body. A plurality of first arms, which have the first pressing roller pivotally attached to an end portion at a pivot point, and are arranged in parallel at intervals in the circumferential direction;
A second arm body having an axially outer end pivotally supported by the second ring portion at a pivot point, and an axially inner end side being able to rise radially outward, and an axially inner side of the second arm body. A plurality of second arms, which have the second pressing roller pivotally attached to the end portion at a pivot point, and are arranged in parallel at intervals in the circumferential direction;
And a guide plate attached to the slide cylinder,
The guide plate is
It forms a slit shape that curves while curving outward in the radial direction toward one side in the circumferential direction, and when the first arm body is inserted, the first pressing roller is displaced toward the one side in the circumferential direction toward the outer side in the radial direction. A plurality of first guide grooves;
It forms a slit shape that curves while curving outward in the radial direction toward the other side in the radial direction, and the second arm body is inserted to shift the position of the second pressing roller toward the outer side in the radial direction. The raw tire forming apparatus according to claim 1, further comprising a plurality of second guide grooves.   The raw tire forming apparatus according to claim 1, wherein the first guide groove is formed on a radially outer side of the second guide groove.   The raw tire molding device according to any one of claims 1 to 3, wherein the second ring portion is disposed radially inward of the first ring portion.   The raw tire molding device according to any one of claims 1 to 3, wherein the second ring part is arranged on the inner side in the axial center direction of the first ring part.   The distance from the pivot point of the first arm body to the pivot point is greater than the distance from the pivot point to the pivot point of the second arm body. The raw tire shaping | molding apparatus in any one.

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