JP5732819B2 - Unvulcanized rubber member and unvulcanized tire crimping device - Google Patents

Description

The present invention relates to an apparatus (also referred to as a stitcher) and a method for pressure-bonding a shoulder portion from a tread portion of an unvulcanized tire and between unvulcanized rubber members. By suppressing the deformation of an unvulcanized tire, the dimensional accuracy of the members is improved, the quality of the tire is improved, and a simple and low-cost crimping method and crimping device are provided.

In pressure bonding between unvulcanized rubber members used in a tire, the unvulcanized rubber member may be deformed by applying an excessive load. Even when the unvulcanized rubber members are bonded together or the unvulcanized rubber members are laminated in a cylindrical shape, if the pressure is excessive, the thickness of the unvulcanized rubber member becomes non-uniform. In addition, even when the shoulder portion is crimped from the tread portion of the unvulcanized tire on the molding drum, if the pressure is excessive, the unvulcanized tire may be deformed, resulting in a vulcanization failure in the vulcanization process, or a product. This causes problems such as deterioration of tire uniformity. On the other hand, if the pressure is too low, the adhesiveness becomes insufficient, and there is a problem that the pressed part is peeled off or the position is shifted before proceeding to the vulcanization process. In addition, since the shape of the unvulcanized tire changes with the size, the control of the crimping apparatus becomes complicated in order to adapt to this, and the apparatus tends to be large and costly.

FIG. 6 is a view showing a state in which the unvulcanized tire base 301 and the tread ring 302 are pressure-bonded in a general radial tire molding process. Here, the unvulcanized tire base 301 includes a carcass 306, a sidewall 307, a bead 308, and the like, and a tread ring 302 is obtained by bonding a tread 304 and a belt 305 together. In the conventional method, as shown in this figure, the unvulcanized substrate 301 expanded in a toroidal shape and an annular tread ring 302 are pressure-bonded using rolls 303a and 303b called stitcher rolls. For crimping, the stitcher rolls 303a and 303b are pressed against the tread ring 302 and the uncured tire base body 301 is rotated, while the stitcher rolls 303a and 303b are gradually moved outward in the tire axial direction and radially inward. Paste the whole. That is, the conventional pressure bonding of the tread ring 302 to the unvulcanized tire base 301 is performed in the tire circumferential direction using the stitcher rolls 303a and 303b. In this case, the tread extends in the circumferential direction, and the tread in the extended portion becomes thin. On the other hand, the portion where the rubber is accumulated becomes thick, and the thickness of the tread member becomes uneven in the circumferential direction. In addition, air can be trapped between the unvulcanized tire base 301 and the tread ring 302, which easily causes problems such as a vulcanization failure, a starting point of breakage during traveling, or a deterioration in tire uniformity.

Moreover, when pressed in the tire circumferential direction as described above, the unvulcanized tire base 301 is deformed in the circumferential direction, and a defect called a code wave is likely to occur. When such a code wave is generated, there is a variation in the carcass length between the beads, and when the tire is inflated, there is a problem that the tire performance and the balance are deteriorated to adversely affect the tire performance. . Especially in winter, the rubber becomes harder and the stickiness of the rubber decreases, so it is often pressed with a stronger force, and these problems are likely to occur, and the problem that the crimped part peels off before vulcanization is also likely to occur. Become.

To improve these problems, the crimping wheel is composed of a plurality of crimping wheel plates that are rotatably inserted into the support rod, and side plates that regulate both sides of the crimping wheel plate. An apparatus for crimping the joint portion of the tire constituent member while the crimping wheel moves along the axial direction of the molding drum of the tire by interposing an elastic member that urges the crimping wheel plate in the radial direction between Has been proposed. (Patent Document 1) This is for the purpose of enabling an unvulcanized rubber member having a seam to be pressure-bonded along its stepped shape, and a plurality of plates are used as pressure rollers, and springs and / or elastic bodies are provided on each plate. It is characterized in that it is provided so that the rotation center of each plate changes along the shape of the seam.

When releasing air by pressing and moving the roller in the axial direction of the molding drum, press one end with a plurality of pressing members in the circumferential direction, and move the plurality of rollers zigzag arranged in the circumferential direction from the center to the other end Then, the roller is returned to the center, the other end side is pressed, the roller is pushed and moved to one end side, and 1/3 turn of the annular member is crimped. After indexing 1/3 turn of the drum, There has been proposed an apparatus that repeats the above-described operation to reliably and efficiently bleed air and press-bond members together. (Patent Document 2) This is for removing air between unvulcanized rubber members laminated in a cylindrical shape by pressing one end of the member and moving a pressure-bonding roll to remove air and unvulcanized rubber. It is characterized in that the deformation of the member is reduced.

Further, a ring-shaped member is connected to the band transfer, and a plurality of pressure rollers are arranged on the ring-shaped member in the circumferential direction. When the band is taken out, the band is inserted into the band drum in the axial direction of the forming drum. There has been proposed a crimping device that prevents the generation of a code wave by crimping to the wire. (Patent Document 3) This is characterized in that a press roll is installed in a ring-shaped frame having a diameter larger than that of the forming drum.

V-shaped annular guide plates that open to the inner diameter side are provided on both sides of the annular base, and the annular rubber tube body is housed to bulge the tube body so that the shoulder portion of the belt and tread becomes an unvulcanized tire. An apparatus for crimping has been proposed. (Patent Document 4) This is characterized in that a rubber tube is used as a member for pressure-bonding a belt and a tread to an unvulcanized tire base.

JP 61-297129 A Japanese Patent Laid-Open No. 06-286018 JP 2005-0668650 A JP2005-014310

The method of pressing in the circumferential direction of the tire with a pressure roll or the like can be applied to the unvulcanized rubber member, even when a rubber sheet is laminated on the molding drum, or the tread of the unvulcanized tire on the molding drum. Even when the shoulder portion is pressed from the portion, there is a problem that it is difficult to keep the rubber thickness in the tire circumferential direction constant. If the rubber thickness in the tire circumferential direction is not constant, there is a problem of adversely affecting the tire uniformity. Further, when the carcass cord generates a code wave, there is a problem that the tire performance and the balance are deteriorated to adversely affect the tire performance. In particular, in winter, the rubber becomes harder and the adhesiveness of the rubber also decreases. Therefore, the rubber is often pressed with a stronger force, and these problems are likely to occur. In the case of a member having high rigidity such as a tread, if the pressure bonding is weak, there is a problem that the bonded portion is peeled off before vulcanization.

In addition, when pressure is applied in the tire circumferential direction, air easily accumulates at the level difference between the members, and when air remains after vulcanization, there is also a problem that the air accumulation portion tends to be a starting point of breakage during traveling.
For this reason, attempts have been made to crimp the tire in the width direction of the tire (in the direction of the forming drum axis), but in cases where the device is complex or the control for operating the device is frequently changed for each tire size, There is a problem that increase, maintenance time and additional cost increase. In addition, when the apparatus becomes large, the price of the apparatus becomes high and the workability at the time of changing the size is often poor. Furthermore, it is inadequate and problematic in that it is always crimped with a constant pressure. These methods have not been able to sufficiently cope with the above problems.

In order to solve the above-described problems, the present invention is a modification of an unvulcanized rubber member or an unvulcanized tire by pressing in the width direction of the tire (axial direction of the forming drum) with a small and simple device. It is possible to provide a low-cost crimping apparatus capable of improving the dimensional accuracy of a member by suppressing the above and improving the quality of a tire. In particular, it is useful as a forming drum axial direction crimping device (stitcher) for a tread portion and a shoulder portion of an unvulcanized tire. More specifically, the crimping apparatus and the crimping method of the present invention have the following configurations (1) to (3).

(1) The basic configuration of the present invention is 1) a plate having a notch, 2) a means for moving the plate up and down (up and down movement means), and 3) a plate having a notch. A guide having guide grooves arranged in such a manner, 4) means for raising and lowering the guide (up-and-down movement means), and 5) a shaft movably connected to the guide through the notch to the support plate The supporting portion is provided with a supporting portion provided with a pressing portion at one end of the supporting plate, and when the unvulcanized rubber member or the unvulcanized tire is pressure-bonded, the moving direction of the pressing portion is the tire. An unvulcanized rubber member and an unvulcanized tire pressure bonding device, which are arranged so as to be in the width direction. In the present invention, the vertical movement means of 2) is coupled to the plate of 1), the vertical movement means and the guide of 3) are coupled and fixed to one frame, and the vertical movement means of 4) is used. It is desirable that the entire frame is raised and lowered.

Further, the crimping apparatus of the present invention may include the following configuration (2) in addition to the above (1).
(2) In order to adjust the movement of the pressing portion to the shape of the member or the shape of the tread portion to the shoulder portion of the unvulcanized tire, the bottom of the cross section of the notch portion is made a straight line with a slope, and the guide A guide having a groove is linear.

Furthermore, the present invention is a method for producing an unvulcanized tire characterized by the following (3).
That is, (3) the present invention uses the crimping device according to (1) or (2) above, and crimps the tread portion to the shoulder portion of the unvulcanized tire in the tire width direction by the pressing portion, After the pressing portion is separated from the unvulcanized tire and either the unvulcanized tire or the crimping device is rotated in the tire circumferential direction, the tread portion to the shoulder portion are similarly crimped in the tire width direction. It is a manufacturing method. The present invention is also a method for producing an unvulcanized tire in which a plurality of the crimping devices according to the above (1) or (2) are arranged and crimped around the unvulcanized tire. In the present invention, the crimping apparatus according to any one of (1) and (2) described above is adapted to the shape of the cross-sectional outer shape of the tread portion to the shoulder portion of the unvulcanized tire. It is a manufacturing method of the unvulcanized tire which controls operation | movement of two vertical movement means. Furthermore, this invention is a crimping | compression-bonding method which presses a tread part-a shoulder part to a tire width direction over the perimeter of a tire peripheral direction by repeating the crimping | compression-bonding by these methods.

According to the present invention relating to (1) above, the shoulder portion can be pressure-bonded with a constant pressure from the tread portion of the unvulcanized tire on the laminated unvulcanized rubber member and the molding drum. That is, the thickness of the unvulcanized tire can be set to a predetermined thickness and air accumulation can be eliminated. As a result, the uniformity of the tire is improved, and the air accumulation that becomes the starting point of destruction of the tire can be reduced. Further, by reducing the code wave of the carcass cord, it is possible to improve the tire runout and balance. Furthermore, even if the rubber becomes hard in winter, it becomes possible to press with an appropriate force, and the problem that the crimped portion is peeled off before vulcanization can be eliminated, and the tire quality can be improved. Furthermore, a compact and simple low-cost crimping apparatus can be provided.

According to the present invention relating to (2) above, in the case of laminated unvulcanized rubber members and unvulcanized tires, the stitcher portion can be moved from its tread portion to the shoulder portion and in accordance with its shape. It is possible to perform pressure bonding with an appropriate pressure without applying excessive pressure to the vulcanized rubber member or the unvulcanized tire and without causing insufficient pressure. That is, as will be described later, like the notch 10 and the guide groove 19 of the plate 13 shown in FIG. 2, the notch and the guide groove are combined so as to match the shape of the object to be crimped. It can be crimped at an appropriate constant pressure.

According to the present invention relating to the above (3), the unvulcanized tire can be pressure-bonded from the tread portion to the shoulder portion of the unvulcanized tire in the circumferential direction of the tire according to its shape at a constant pressure. And by repeating this operation | movement, a shoulder part can be uniformly crimped | compressed over a tire peripheral direction perimeter from a tread part. Furthermore, in the apparatus of the present invention according to the above (1) and (2), as described later, the stroke amounts of the two vertical movement means 14, 40 are set in advance according to the crimping operation time for each tire size. In this case, the shoulder portion can be uniformly crimped over the entire circumference in the tire circumferential direction from the tread portion.

FIG. 1 is a diagram showing a first embodiment of the present invention. FIG. 2 is a diagram showing an embodiment of the pressing portion of the present invention. FIG. 3 is a diagram showing an example of a crimping operation in the first embodiment of the present invention. FIG. 4 is a diagram showing an operation example (stroke amount) of the vertical movement means in the first embodiment of the present invention. FIG. 5 is a diagram showing the control of the crimping operation in the present invention. FIG. 6 is a view showing an example of pressure bonding of an unvulcanized tire according to a conventional method. FIG. 7 is a diagram showing the displacement of the carcass cord due to the crimping.

The embodiment (production process) of the unvulcanized tire of the present invention will be briefly described as follows. That is, at least one of the step of crimping the tread portion to the shoulder portion of the unvulcanized tire in the tire width direction by the pressing portion, the step of separating the pressing portion from the unvulcanized tire, and any of the unvulcanized tire or the crimping device. The method includes a step of rotating in the tire circumferential direction, a step of crimping the tread portion to the shoulder portion in the tire width direction at a position where the rotation is stopped, and a step of crimping the tread portion to the shoulder portion over the entire circumference in the tire circumferential direction. Further, a plurality of the crimping devices of (1) and (2) above are arranged around the unvulcanized tire to constitute the above manufacturing process. Further, the operation of the pressing portion in these processes consists of adjusting the operations of the two vertical movement means 2) and 4). By setting it as such a structure, the tread part-shoulder part of an unvulcanized tire can be crimped | bonded uniformly in the width direction of a tire over the tire peripheral direction perimeter. Hereinafter, embodiments of the present invention will be described in detail.

FIG. 1 is a diagram showing a first embodiment of the present invention. Although 1 shows the crimping | compression-bonding apparatus of this invention, although normally two or more units | sets are arrange | positioned with respect to the unvulcanized tire circumferential direction surface as shown in FIG. The crimping device 1 of the present invention is opposed to a plate 13 having a notch 10, a means 14 for raising and lowering the plate 13 (hereinafter, vertical movement means), and a plate 13 having the notch 10. The guide 16 having the guide groove 15 disposed, the vertical movement means 40 of the guide 16, and the shaft 21 passing through both the notch 10 and the guide groove 15 of the guide 16 are attached and fixed to the support plate 20. The support plate 20 is provided with a seat plate 22 as a support portion. The seat plate 22 has a fixed portion 23 having a fixed plate 23 and a cushion portion 26 made of an elastic body, and the pressing portion 25 has a rotation center shaft 24 made of a bearing or the like. It has a configuration. Further, the seat plate 22 is configured such that the mounting position can be adjusted in the tire width direction by changing the tightening position to the support plate 20 with, for example, bolts and nuts. The pressing portion 25 is a rotating roller, and is particularly limited as long as it is difficult to adhere to an unvulcanized tire, such as metal, plastic, urethane, foam or hard rubber, and can transmit pressure to the member while maintaining its shape as a roller. Not.

In FIG. 1, the plate 13 is fixedly coupled to the frame 17 by the vertical movement means 14 and the guide 16 having the guide groove 15, and the frame 17 is moved up and down by the vertical movement means 40. It has a possible configuration. The notch 10 of the plate 13 is formed in a rectangular shape and inclined at a certain angle, and the shaft 21 is made to be able to move in the notch. The guide groove 15 is formed in a rectangular shape in the horizontal direction. Here, when the vertical movement means 14 raises the plate 13, the shaft 21 is pushed by the rectangular bottom 11 of the notch 10 and apparently moves so as to slide down the bottom 11, and enters the guide groove 15. Along the horizontal direction of the paper surface. When the shaft 21 moves in the horizontal direction, the pressing portion 25 fixed to the support portion provided with the shaft 21 also moves in the horizontal direction simultaneously with the shaft 21.

An unvulcanized tire 100 composed of an unvulcanized tire base 101 and a tread ring 102 is set on a molding drum (not shown) above the crimping apparatus in FIG. The unvulcanized tire base 101 includes a carcass 110, sidewalls 111, beads 112, and the like. Further, the tread ring 102 is obtained by bonding a tread 113 and a belt 114 together. The unvulcanized tire base 101 has a toroidal shape and the tread ring 102 has an annular shape. In FIG. 1, the unvulcanized tire base 101 is inflated and joined to the tread ring 102.

In FIG. 1, when the vertical movement means 40 is raised, the pressing portion 25 is attached to the molding drum and presses the tire base 101, so that the tread ring 102 can be pressure-bonded to the unvulcanized tire base 101. Further, by raising and lowering the vertical movement means 14, the plate 13 rises, and the shaft 21 is pushed by the bottom 11 of the notch 10 and moves horizontally along the guide groove 15 of the guide 16 to the left side of the drawing. As a result, the support plate 20 coupled to the shaft 21 moves horizontally to the left side of the drawing as with the shaft 21, and the pressing portion 25 moves horizontally to the left side of the drawing as well. Therefore, the pressing portion 25 can be freely moved up and down and horizontally by appropriately controlling the rising amounts of the two vertically moving means 14 and 40, so that the tread ring 102 is moved to the unvulcanized tire base 101 and the unvulcanized tire. It can be crimped according to 100 external shapes.

FIG. 4 is a diagram showing the movements of the two vertical movement means 14 and 40 as an increase amount (stroke amount) with respect to time. In FIG. 1, symbol A indicates the position of the tread in the width direction end, symbol B indicates the position of the corner of the trapezoidal shape of the tread, and symbol C indicates the end position in the tire radial direction of the shoulder of the unvulcanized tire. . Here, A to B are substantially horizontal, and B to C are curved.
4 (a) shows the operation of the vertical movement means 40, and FIG. 4 (b) shows the operation of the vertical movement means 14. Time ta indicates the time when the pressing part 25 reaches the position A of the tread, time tb indicates the time when the pressing part reaches the position of the tread B, and time tc indicates the time when the pressing part reaches the end C of the shoulder. ing.

The operation of the two vertical movement means 14 and 40 in FIG. 1 showing the first embodiment of the present invention will be described with reference to FIG. First, the vertical movement means 40 is raised by a predetermined amount, and the pressing portion 25 reaches the position A. Next, since the position A to B is substantially horizontal, the vertical movement means 40 stops in that state, and the vertical movement means 14 continues to rise until time tb. At this time, if the rising amount of the vertical movement means 14 is constant with respect to time, the time ta to tb in FIG. Next, until the pressing portion 25 exceeds the position B and reaches the position C, if the rising amount of the vertical movement means 14 is constant, it will be linear during the time tb to tc in FIG. Since the means 40 needs to gradually increase the amount of increase so as to match the curve of the positions B to C of the unvulcanized tire, the curve between the times tb and tc as shown in FIG. Become. However, when the vertical movement means 14 and 40 are operated as described above, the pressing speed between the positions B to C becomes faster than that between the positions A to B. In order to make the pressing speed between the positions B to C the same as the positions A to B, the vertical movement means 14 is slowed down between the times tb and tc as shown by the broken line in FIG. (That is, the increase in stroke amount should be reduced).

As described above, the first embodiment of the present invention can be applied to many tire sizes by adjusting the rising amounts of the two vertical movement means 14 and 40 for each tire size.

In FIG. 1, the angle of the base 11 of the notch 10 with respect to the horizontal direction indicated by reference numeral 12 can be determined according to the tire size, the horizontal and vertical lengths of the crimping portion, etc. ~ 50 ° is desirable. If the angle exceeds 50 °, the horizontal movement distance of the pressing portion 25 with respect to the stroke amount of the vertical movement means 14 becomes relatively short, and accordingly, the crimping operation time tends to be long. Further, the distance in the horizontal direction is shortened, and it becomes difficult to roll the stitcher roll from the tread to the shoulder. On the other hand, if the angle is less than 30 °, the force that causes the base 11 of the notch 10 to move the shaft 21 in the horizontal direction is relatively weakened. Therefore, in order to compensate for this, the load on the vertical moving means 14 is set high. Then, since the load applied to the notch 10, the guide groove 15, and the shaft 21 becomes high, these must be manufactured firmly, and the size and weight of the crimping device tend to increase.

FIG. 2A is a diagram showing an arc-shaped multi-roller 27 in which a plurality of rollers are arranged in an arc shape. The plurality of rollers 28 can freely rotate around a rotation shaft 29, are housed in a frame 30, and are connected to a support plate 32 via a rotatable shaft 31. Here, the support plate 32 is a component corresponding to the support plate 20 in FIGS. 1 and 2, while FIG. 2B is a diagram showing that the arc-shaped multi-roller 27 is used as the pressing portion of the present invention. is there. FIG. 2B is a side view of the unvulcanized tire. Here, the unvulcanized tire 100 includes a tread ring 102, a sidewall 111, a bead 112, and the like. By matching the curvature (corresponding to the curvature of the rotating shaft 29) drawn by the arc-shaped multi-roller 27 with the curvature in the tire circumferential direction from the tread end portion to the shoulder portion, a wide range can be crimped by a single press, so that crimping is performed. Time can be shortened. Further, if the rotation shaft 29 is provided with an appropriate flexibility, the curvature drawn by the rotation shaft 29 can be automatically matched with the tire circumferential curvature of the crimping portion. The material of the rotating shaft 29 is not particularly limited as long as it shows elasticity as a linear body, such as metal or plastic, and the flexibility can be adjusted by changing the diameter of the axis.

The pressing part 25 is not particularly limited as long as it is difficult to adhere to an unvulcanized tire, such as metal, plastic, urethane, foam or hard rubber, and can transmit pressure to the member while maintaining its shape as a roller.

The vertical moving means 14 and 40 are not particularly limited as long as they can move up and down, such as an electric cylinder, a hydraulic or hydraulic cylinder using a fluid, and an air cylinder.

The cushion portion 26 shown in FIG. 1 and FIG. 2 always has a constant pressing force so that the pressing portion 25 does not apply excessive pressure to the unvulcanized rubber member or the unvulcanized tire, or causes insufficient pressure. It can be expanded and contracted. The material of the cushion part 26 is not particularly limited as long as it is an elastic body such as elastomer, rubber, metal or plastic spring. Moreover, this cushion part can be used as needed.

In addition, there is a method of containing fluid in the guide grooves 15 and 19 of the guides 16 and 18. When the shaft 21 moves along the guide grooves 15 and 19, the fluid passes through the gap between the guide grooves 15 and 19 and the shaft 21, so that the shaft 21 moves through the guide grooves by the lubricating action. It can move smoothly. Further, even when the operation of the vertical movement means 14 is fluctuated, the fluid acts as a resistor to relieve the rapid movement of the shaft 21 against the rapid movement of the shaft 21. As the fluid, those having appropriate fluidity and viscosity such as various oils such as mineral oil, animal oil and vegetable oil, or liquid rubber are desirable.

FIG. 3 is a diagram showing a pressure-bonding operation of an unvulcanized tire using the first embodiment of the present invention. The unvulcanized tire 100 is set on a molding drum (not shown). The crimping devices 1a and 1b are arranged on the left and right sides of the width direction of the tire and operate in conjunction with each other. FIG. 3A shows a standby position of the crimping apparatuses 1a and 1b when the crimping operation is started. At this stage, as shown in FIG. 3A, the pressing portion 25 is not in contact with the tread portion of the tire. FIG. 3B is a diagram showing the crimping start position, and shows the operating state of the crimping apparatuses 1a and 1b when the vertical movement means 40 moves up and reaches the predetermined position of the tread. FIG. 3 (c) is a diagram showing the folding position of the crimping operation, and the vertically moving means 14 and 40 have finished crimping the shoulder portion from the tread edge by the operation shown in the time tb to tc of FIG. 4 (b). Indicates. FIG. 3D shows a state in which the pressing portion 25 has been separated from the unvulcanized tire after the pressure bonding has been completed. The crimping is performed in the order of (a), (b), (c), (d) as shown in this figure, and after returning to the standby position (a), the unvulcanized tire 100 is rotated by a predetermined amount. Then, the next crimping is performed. By repeating this, the entire circumference in the tire circumferential direction is crimped. At that time, if there are a plurality of crimping devices around the unvulcanized tire, the crimping operation time can be shortened. Further, by arranging the crimping devices 1a and 1b mirror-image-symmetrically with respect to the circumferential surface of the unvulcanized tire and simultaneously performing the above-described series of crimping operations, the pressing parts 1a and 1b Since the crimping is performed in mirror image symmetry with respect to the circumferential surface, a more stable crimping operation can be performed.

FIG. 5 is a diagram showing the control of the crimping operation in the present invention. Commands from the control panel 201 that controls the molding drum and the crimping apparatus are instructed to the vertical movement means 14 and 40 of the crimping apparatus as 202 and 203, respectively. A command to the forming drum is instructed at 204, and the control panel 201 controls the whole. Thereby, the operation of the vertical movement means 14 and 40 shown in FIG. 3 and the rotation of the molding drum are controlled.

The uniformity of the tire produced by the conventional method shown in FIG. 6 and the tire produced by the present invention were compared by RFV (radial force variation). In Table 1, the RFV value of the present invention when the RFV value of the conventional tire is set to 100 is indicated by an index. As can be seen from Table 1, the RFV of the tire of the present invention was improved by about 46% (RFV decreased) from the RFV of the conventional tire, and the tire uniformity was improved. Regarding the carcass cord disturbance, a lattice pattern marker (a so-called grid sheet) was attached to the carcass, and the displacement of the lattice pattern carcass cord before and after crimping was analyzed by image processing. FIG. 7 is a diagram showing the result of image processing of the change in the position of the carcass cord after the compression of a pneumatic tire having a tire size of 235 / 40R18. The horizontal axis indicates the width direction of the tire. The numerical value 0 is the position of the crown center, and the numerical value + -180 is the position directly below the bead. The vertical axis represents the displacement amount of the carcass cord before and after crimping as an index. The carcass cord disturbance index shown in Table 1 is calculated by calculating the standard deviation of the displacement amount shown in FIG. The larger the index, the larger and worse the carcass chord disturbance. By using the present invention as described above, the gauge of the unvulcanized tire is maintained uniformly, the air accumulation between the tread ring and the unvulcanized tire base is reduced, and the carcass cord disturbance is reduced. Uniformity can be improved.

By using the present invention, a small and simple device can be obtained, and the control thereof can be simplified. And by crimping in the width direction of the tire, the deformation of the unvulcanized rubber member and the unvulcanized tire is suppressed, the dimensional accuracy is improved, and the air accumulation between the tread ring and the unvulcanized tire base is reduced. Further, the disturbance of the carcass cord in the unvulcanized tire can be reduced, and the uniformity of the tire can be improved.

The present invention can be used for pressure bonding of an unvulcanized rubber member and an unvulcanized tire. Since the configuration is simple and the control is simple, a low-cost crimping apparatus can be provided.

DESCRIPTION OF SYMBOLS 1 ... Crimping device 10 ... Notch part 13 ... Plate 14 ... Vertical movement means 15 ... Guide groove 16 ... Guide 17 with guide groove ... Frame 20 ... Support Plate 21 ... Shaft 22 ... Seat plate 23 ... Fixed part 24 ... Rotating shaft 25 ... Pressing part 26 ... Cushion part 27 ... Arc-shaped multi-roller 40 ... Vertical movement Means 100... Unvulcanized tire 101... Unvulcanized tire base 102... Tread ring 303a, 303b.

Claims (10)

1) a plate having a notch,
2) means for raising and lowering the plate (up and down movement means 1 ),
3) A guide having a guide groove 15 disposed so as to face the plate having the notch.
4) means for raising and lowering the guide (vertical movement means 2 ) , and 5) passing through both the notch portion of the plate and the guide groove of the guide ,
It has a support plate provided with a fixed shaft that movably connects the plate and the guide , and is configured at least from a support portion provided with a pressing portion at one end of the support plate,
The guide groove of the guide is a horizontal groove, and the shaft can move in the horizontal direction along the guide groove,
The notch portion of the plate is inclined obliquely with respect to the guide groove, and the shaft can move obliquely upward or obliquely downward with respect to the horizontal direction along the notch portion. ,
When the pressing portion presses the unvulcanized rubber member and / or the unvulcanized tire attached to the molding drum, the moving direction of the pressing portion is the width direction of the unvulcanized rubber member and / or the tire. The unvulcanized rubber member and the unvulcanized tire pressure bonding apparatus, wherein the unvulcanized rubber member and / or the unvulcanized tire are arranged so that
The vertical movement means 1 of 2) is coupled to the plate of 1), the vertical movement means 1 and the guide of 3) are coupled and fixed to one frame, and the vertical movement means 2 of 4) is used to 2. The unvulcanized rubber member and the unvulcanized tire crimping device according to claim 1 , wherein the whole is raised and lowered , whereby the pressing portion is movable in the vertical direction and the horizontal direction. .
The unvulcanized rubber member and the unvulcanized tire pressure bonding apparatus according to claim 1, wherein the guide groove is a groove formed in a rectangular shape in a horizontal direction.
Bottom of the notch section is characterized by a linear shape in which a gradient inclined at an angle in an oblique direction with respect to the horizontal direction, un according to any one of claims 1 to 3 Crimping device for vulcanized rubber members and unvulcanized tires.
The unvulcanized rubber member and the unvulcanized tire pressure bonding apparatus according to claim 4, wherein an inclination angle of a bottom of the cut-out cross section is 30 degrees to 50 degrees.
The pressing portion is a rotatable roller, and one or a plurality of the pressing portions are arranged in the circumferential direction of the unvulcanized rubber member and the unvulcanized tire. Crimping device for unvulcanized rubber member and unvulcanized tire.
The plurality of arranged rollers are arc-shaped multi-rollers, and a curvature drawn by the arc-shaped multi-roller is equal to a curvature in a tire circumferential direction from a tread end portion to a shoulder portion. Crimping device for unvulcanized rubber member and unvulcanized tire.
The step of crimping at least the tread portion to the shoulder portion of the unvulcanized tire in the tire width direction with the pressing portion using the crimping device according to any one of claims 1 to 7 , the pressing portion being unvulcanized A step of separating from the tire, a step of rotating any of the unvulcanized tire or the crimping device in the tire circumferential direction, and a step of crimping the tread portion to the shoulder portion in the tire width direction at a position where the rotation is stopped. A method for crimping an unvulcanized tire.
A plurality of the crimping apparatuses according to any one of claims 1 to 7 are arranged around an unvulcanized tire, and at least a tread portion to a shoulder portion of the unvulcanized tire are crimped in a tire width direction by a pressing portion. The step, the step of separating the pressing portion from the unvulcanized tire, the step of rotating either the unvulcanized tire or the crimping device in the tire circumferential direction, and the width of the tread portion to the shoulder portion at the position where the rotation is stopped. A method for crimping an unvulcanized tire, comprising a step of crimping in a direction.
At least the step of crimping the tread portion to the shoulder portion of the unvulcanized tire in the tire width direction with the pressing portion so as to match the shape of the cross-sectional shape in the width direction, the step of separating the pressing portion from the unvulcanized tire, It consists of a step of rotating either the vulcanized tire or the crimping device in the tire circumferential direction, and a step of crimping the tread portion to the shoulder portion in the tire width direction at the position where the rotation is stopped. The method according to claim 8 or 9, characterized in that the adjustment is performed by adjusting the operations of the two vertical movement means (2) and (4).