JP6313702B2 - Green tire manufacturing method and apparatus - Google Patents

Description

    The present invention relates to a manufacturing method and apparatus for manufacturing a green tire by folding a folded portion of a tire constituent member around a bead core.

    As a conventional green tire manufacturing apparatus, for example, a device described in Patent Document 1 below is known.

JP 2008-307849 A

  This is a molding drum that can bulge a body portion of a tire constituent member located between the bead cores radially outward while supporting a pair of bead cores and a cylindrical tire constituent member from the radially inner side, A pair of sliders arranged axially outward from the bead core and movable in the axial direction; a plurality of folded arms arranged at the outer ends of the sliders so as to be swingable and spaced apart in the circumferential direction; The slider can be moved in the axial direction, and when the slider moves inward in the axial direction, the folded-back portion of the tire component member positioned axially outside the bead core is folded back around the bead core by the inner end portion of the folding arm. Moving means.

    In such a manufacturing apparatus, the slider may be rotated together with the folding arm by a predetermined angle of less than 360 degrees. Conventionally, it is detected whether or not the rotation of the predetermined angle has been accurately performed. Since there is no excess or deficiency in the rotation described above, there is a problem that trouble occurs in the subsequent process.

  This invention measures the rotation angle of the slider and the folding arm with high accuracy, and determines whether or not the rotation angle is a predetermined angle, thereby preventing trouble in the subsequent process. It is an object of the present invention to provide a tire manufacturing method and apparatus.

    The first object is to swell the body portion of the tire constituent member located between the bead cores radially outward while supporting the paired bead core and the cylindrical tire constituent member from the radially inner side. And by moving a pair of sliders, which are arranged axially outward from the bead core and movable in the axial direction, to the inner side in the axial direction, the outer end portions of the sliders are swingably supported and separated in the circumferential direction. A step of turning back a turning portion of a tire constituent member positioned axially outside the bead core by inner end portions of a plurality of turning arms arranged in the direction around the bead core, and moving the pair of sliders outward in the axial direction Detaching from the folded portion, rotating the slider together with the folded arm by a predetermined angle of less than 360 degrees, and rotating the slider. Before the beginning, from the starting intersection where the axial line passing through the reference position and the arcuate surface of the inclined body having an arcuate surface that rotates integrally with the slider and is inclined with respect to the circumferential direction at the outer end in the axial direction intersect. After the end of the rotation of the slider, a step of measuring an axial distance to an end intersection where the axial line and the arcuate surface intersect, and a rotation angle of the slider is obtained based on the measurement result. And a step of determining whether or not the rotation angle is the predetermined angle.

  Secondly, a molding drum capable of bulging the main body portion of the tire constituent member located between the bead cores radially outward while supporting the paired bead core and the cylindrical tire constituent member from the radially inner side; A pair of sliders arranged axially outward from the bead core and movable in the axial direction; a plurality of folded arms arranged at the outer ends of the sliders so as to be swingable and spaced apart in the circumferential direction; The slider can be moved in the axial direction, and when the slider moves inward in the axial direction, the folded-back portion of the tire component member positioned axially outside the bead core is folded back around the bead core by the inner end portion of the folding arm. A moving means; a rotating means for rotating the slider together with the folding arm by a predetermined angle of less than 360 degrees; End of rotation of the slider from the starting intersection where the arcuate surface intersects the axial line passing through the reference position before the start of the rotation of the slider, and the inclined body having the arc-shaped surface inclined with respect to the circumferential direction at the outer end. Thereafter, the measuring means for measuring the axial distance to the end intersection where the axial line and the arcuate surface intersect, the slider rotation angle is obtained based on the measurement result by the measuring means, and the obtained rotation angle is This can be achieved by a green tire manufacturing apparatus including a determination unit that determines whether or not the angle is the predetermined angle.

  In this invention, before the start of the rotation of the slider, from the start intersection where the axial line passing through the reference position and the arcuate surface of the inclined body intersect, after the end of the rotation of the slider, the axial line and the arcuate surface After measuring the axial distance to the end intersection where the crossing points are measured by the measuring means, the rotation angle of the slider is obtained based on the measurement result, and the judging means judges whether or not the obtained rotation angle is a predetermined angle. As a result, the rotation angle can be measured with high accuracy while having a simple configuration, and this can easily avoid a situation in which the rotation angle is outside the predetermined angle. Trouble can be prevented beforehand.

  According to the third aspect of the present invention, the rotation angle of the slider can be easily obtained from the axial distance from the start intersection to the end intersection using a simple arithmetic expression. Furthermore, if comprised as described in Claim 4, when carrying in a tire structural member and a bead core with respect to a shaping | molding drum, interference with these and an inclined body can be prevented reliably. Further, according to the fifth aspect, the axial distance from the start intersection to the end intersection can be measured with high accuracy without contact. Furthermore, if the laser displacement meter is also used for detecting the swing of the folding arm as described in claim 6, it is possible to confirm whether or not the folding work is completed while the structure is simple and the manufacturing cost is low. .

It is a schematic plan view which shows Embodiment 1 of this invention. It is the front sectional drawing. It is a top view of the rotating means vicinity. It is a top view of an inclined body. It is the II arrow directional view of FIG. It is front sectional drawing similar to FIG. 2 explaining operation | movement. It is front sectional drawing similar to FIG. 2 explaining operation | movement.

Embodiment 1 of the present invention will be described below with reference to the drawings.
1 and 2, 11 is a forming drum for producing a green tire, and this forming drum 11 has a horizontal main shaft 12 rotatably supported by a drive unit 13, and the main shaft 12 is the drive unit. It can be rotated around its axis by receiving a driving force from 13. Reference numeral 14 denotes a pair of movable bodies that are fitted to the outer sides of both ends (base end portion and distal end portion) in the axial direction of the main shaft 12 so as to be movable in the axial direction, and can rotate together with the main shaft 12. When a driving force is applied from a driving mechanism (not shown), it moves in the axial direction by an equal distance in the opposite direction and approaches and separates from each other. Reference numeral 15 denotes a beadlock body having a plurality of arc shapes. These beadlock bodies 15 are arranged at equal distances in the circumferential direction, and the axially inner end of the movable body 14 (the axially central side of the main shaft 12) ) Is supported. These bead lock bodies 15 can be moved in a radial direction and expanded / contracted by an expansion / contraction mechanism (not shown).

  18 is a tire constituent member having a cylindrical shape molded by a molding drum different from the molding drum 11, and this tire constituent member 18 is mainly composed of a carcass ply (here, including a side tread). A pair of bead cores 20 with a stiffener 19 is set here at a predetermined position outside the both ends in the axial direction. The tire component 18 and the bead core 20 with the stiffener 19 are taken out from the other forming drum and then transported by a transport means (not shown) to be loosely fitted outside the forming drum 11. At this time, the bead core 20 is set so as to overlap the radially outer side of the bead lock body 15. In this state, when the bead lock body 15 is synchronously moved radially outward by the expansion / contraction mechanism described above, the tire constituent member 18 is pressed against the bead core 20 from the radially inner side by the bead lock body 15.

  The bead lock body 15 and the expansion / contraction mechanism described above constitute a pair of bead lock mechanisms 21 that support both ends of the tire constituent member 18 in the axial direction and the bead core 20 from the radially inner side, and the bead lock mechanism 21 constitutes a tire. When the member 18 and the bead core 20 are supported, the tire constituent members 18 are respectively disposed on the body portion 22 positioned between the pair of bead cores 20 and on the axially outer side (both axial ends of the main shaft 12) from the bead core 20. It divides into the folding | turning part 23 located. When the tire component 18 and the bead core 20 are supported by the bead lock mechanism 21 in this way, the movable body 14 and the bead core 20 are moved inward in the axial direction by the drive mechanism and approach each other, while the tire configuration between the bead cores 20 Pressurized fluid is supplied from a bulging means such as a pressurized fluid source (not shown) into the member 18 (main body portion 22), whereby the main body portion 22 bulges and deforms outward in the radial direction and has a substantially semicircular cross section. However, the folded portion 23 remains cylindrical. In the present invention, the plurality of core bodies arranged side by side in the circumferential direction are synchronously moved outward in the radial direction so that the main body portion is expanded, or the bladder is arranged radially inward of the main body portion. The pressurized fluid may be supplied to the inside of the main body to bulge the main body.

  26 is a cylindrical member fitted outside the movable body 14 positioned axially outside the bead lock body 15, and these cylindrical members 26 are rotatably supported by the movable body 14. Axial movement relative to 14 is prevented (the axial position relative to the movable body 14 is unchanged). 27 are annular grooves formed on the outer periphery of the axial center of each cylindrical member 26 and continuous in the circumferential direction. The inner periphery of these annular grooves 27 is slidably engaged with the bottom surface of the annular groove 27 in an airtight state. A ring-shaped movable piston 29 is housed. 28 is a slider that is disposed on the outer side in the axial direction from the bead core 20, and is slidably fitted to the outer side of the cylindrical member 26 so as to be slidable in the airtight state. Are provided integrally. The sliders 28 are movable in the axial direction with respect to the cylindrical member 26, but are prevented from rotating with respect to the cylindrical member 26. As a result, the slider 28 rotates integrally with the cylindrical member 26.

  The outer end portions (base ends) of a plurality of folding arms 33 arranged at equal angular intervals in the circumferential direction are rotatably connected to the outer end portions of the sliders 28 in the axial direction. The outer end 33 is supported so that it can swing in the radial direction while drawing an arc on the slider 28. Further, a plurality of folding rollers 34 (the same number as the folding arms 33) that can be brought into rolling contact with the tire constituent member 18 are supported on the inner end portions (tip portions) of the folding arms 33 so as to be freely rotatable. 35 is a ring-shaped elastic band which is fitted to the outer side of the central portion in the longitudinal direction of all the folding arms 33, and is formed of, for example, a rubber band or the like. Always applied, the folding arm 33 is swung in the closing direction. Here, a cylinder chamber 36 is formed between the cylindrical member 26 and the slider 28. The cylinder chamber 36 is partitioned into an inner chamber 36a and an outer chamber 36b by the movable piston 29. Then, when pressurized fluid is supplied to the inner chamber 36a from a pressurized fluid source (not shown) and the slider 28 moves to the outer limit in the axial direction as shown in FIG. Is oscillated to the inner limit in the radial direction extending substantially parallel to the main shaft 12 by the urging force (elastic force).

  On the other hand, when pressurized fluid is supplied from the pressurized fluid source to the outer chamber 36b, the slider 28 and the folding arm 33 are axially moved together so as to approach the tire component 18 as shown in FIG. At this time, each folding arm 33 swings around the outer end so as to expand radially outward against the urging force of the elastic band 35, while the folding roller 34 is folded. Accordingly, the folded portion 23 of the tire component 18 is folded along the body portion 22 around the bead core 20 with the stiffener 19 interposed therebetween. Is formed. At this time, since the elastic band 35 is stretched by swinging the folding arm 33 radially outward, the elastic restoring force (biasing force) is applied to the folding arm 33 to swing the folding arm 33 radially inward. As a result, the folding roller 34 is pressed against the folding part 23, and the folding part 23 is pressed against the main body 22 and the stiffener 19 in the rolling path of the folding roller 34.

  The movable piston 29 and the pressurized fluid source described above constitute a moving means 37 for moving the slider 28 in the axial direction, and when the moving means 37 is activated and the slider 28 moves inward in the axial direction, the folding arm The folded portion 23 of the tire constituent member 18 positioned axially outside the bead core 20 is folded around the bead core 20 by the inner end portion (folding roller 34) of 33. In the present invention, instead of the elastic band 35, the inner end portion of the link whose outer end portion is connected to the central portion in the longitudinal direction of the folding arm is connected to a moving body that moves in the axial direction by receiving a driving force. Then, the folding arm may be forcibly rocked in the radial direction by moving the moving body. According to the present invention, the fixed piston is integrally formed on the outer surface of the central portion in the axial direction of the cylindrical member, and the slider is constituted by the fixed piston and a cylinder case slidably engaged with the cylindrical member. The slider may be moved in the axial direction by supplying and discharging pressurized fluid to and from an inner chamber or an outer chamber that is formed between the two chambers and partitioned by a fixed piston.

  Reference numeral 40 denotes a cylinder part formed on each movable body 14 on the axially outer side from the cylindrical member 26. Inside these cylinder parts 40, a cylinder chamber 42 partitioned into an inner chamber 42a and an outer chamber 42b by a piston 41 is provided. An inner portion of the rod portion 43 that is formed and extends inward in the axial direction from the piston 41 protrudes inward in the axial direction from the cylinder portion 40. When a pressurized fluid is supplied to the inner chamber 42a from a pressurized fluid source (not shown), the piston 41 moves outward in the axial direction while being restricted in rotation, while on the other hand from the pressurized fluid source When pressurized fluid is supplied to the chamber 42b, the piston 41 moves in the axial direction while its rotation is restricted. 44 is a plurality of connecting links equidistant from each other in the circumferential direction. These connecting links 44 are inclined with respect to a straight line parallel to the axis of the forming drum 11 as shown in FIGS. The axial inner end is connected to the axial outer end of the cylindrical member 26 via a ball joint 45, and the axial outer end is connected to the axial inner end of the rod portion 43 via a ball joint 46. ing.

  Then, as described above, when the piston 41 and the rod portion 43 move inward in the axial direction from the position indicated by the solid line in FIG. 3 to the position indicated by the phantom line, the connecting link 44 is centered on the outer end portion and the inner end portion. At this time, since the cylindrical member 26 is prevented from moving in the axial direction but is allowed to rotate, the cylindrical member 26, the slider 28, and the folding arm 33 are in relation to the forming drum 11 and the movable body 14. Integrally around a predetermined angle of less than 360 degrees around the axis of the forming drum 11, here, an odd multiple of an angle that is half of the crossing angle at which the rolling paths of two circumferentially adjacent folding rollers 34 intersect (here In this case, it is 1 time and rotates by a small angle of 10 degrees or less. The cylinder part 40, the piston 41, the connecting link 44, and the pressurized fluid source described above constitute a rotating means 50 that rotates the slider 28 together with the folding arm 33 by a predetermined angle of less than 360 degrees. In the present invention, the rotating means is composed of a large gear provided on the outer periphery of the cylindrical member and a small gear that is rotated by a rotating mechanism supported by a movable body and meshes with the large gear, or You may comprise from the worm wheel provided in the cylindrical member, and the worm which is rotated by the rotation mechanism supported by the movable body, and meshes with the worm wheel.

  Thus, after rotating the cylindrical member 26, the slider 28, and the folding arm 33 by a predetermined angle with respect to the main shaft 12 and the movable body 14 by the rotating means 50, the slider 28 is moved inward in the axial direction by the moving means 37. The folding roller 34 is synchronously moved radially outward again while being brought into rolling contact with the folded-back portion 23. At this time, the folding roller 34 is rotated in the circumferential direction at the time of the first (first) folding as described above. Since the folding roller 34 is located at a position deviated in the circumferential direction by a predetermined angle from the position, the folding roller 34 rolls to the folding portion 23 along a second separate movement path that is separated from the first movement path by a predetermined angle in the circumferential direction. It will move radially outward while in contact. As a result, the folding roller 34 presses and crimps the unbonded region of the folded portion 23 located between the crimped regions crimped by the first movement to the main body portion 22, thereby the main body portion 22 and the folded portion. Effectively suppresses air entering between 23.

  In FIGS. 1, 2, 4, and 5, reference numeral 53 denotes a plurality of arcuate shapes, here, a pair of inclined bodies, and the radius of curvature of the outer periphery of these inclined bodies 53 is the same as or slightly smaller than the radius of curvature of the outer periphery of the slider 28. . 54 is a plurality of elongated holes formed in the inclined body 53 and penetrating in the axial direction, and bolts (not shown) inserted into the elongated holes 54 are screwed into the axially outer end surface of the slider 28, The inclined body 53 is attached to the outer end surface in the axial direction of each slider 28 so that the position of the inclined body 53 can be changed while maintaining a coaxial relationship with the slider 28. Thus, when the slider 28 rotates, the inclined body 53 rotates. And can rotate together. Here, the inclined body 53 is arranged such that the radially outer end thereof is located radially inward from the folding arm 33 that has swung to the radially inner limit, whereby the tire constituting member 18 with respect to the forming drum 11 is arranged. When the bead core 20 with the stiffener 19 is carried in, it is possible to reliably prevent the tire constituent member 18, the bead core 20 with the stiffener 19 and the inclined body 53 from interfering with each other. In the present invention, the inclined body may be installed on the cylindrical member 26, or as long as the interference can be prevented when the tire constituent member 18 and the bead core 20 are carried in as described above, the slider An inclined body may be installed on the outer periphery of 28. An inclined portion 55 is formed on one side in the circumferential direction of the inclined body 53, and the thickness of the inclined portion 55 in the axial direction gradually increases from one end in the circumferential direction toward the other end in the circumferential direction. As a result, the outer end in the axial direction of the inclined portion 55 is inclined with respect to the circumferential direction, that is, inclined with respect to a plane perpendicular to the axis of the forming drum 11, from here one end in the circumferential direction to the other end in the circumferential direction. An arcuate surface 56 that is inclined outward in the axial direction as it goes is formed.

  Reference numeral 59 denotes a side surface of the drive unit 13, which is a laser displacement meter as a measuring means installed at a reference position E, which is a fixed point determined at the time of design. An axial line D (laser displacement meter) passing through the reference position E The same as the optical axis of the laser beam emitted from 59) intersects the inclined surface 56 of the inclined body 53 installed on the base end side. The laser displacement meter 59 irradiates the arc-shaped surface 56 of the inclined portion 55 with laser light and receives the laser light reflected on the arc-shaped surface 56. 60 is a transport mechanism that can move in the axial direction while being guided by a guide rail 61 that is parallel to the axis of the forming drum 11. This transport mechanism 60 removes the molded green tire from the forming drum 11, and It can be conveyed to a vulcanizer not shown. 62 is a support that can move in a direction orthogonal to the axis of the main shaft 12, and this support 62 supports the tip of the main shaft 12 when it is located at an intersecting position that intersects the axis of the main shaft 12. be able to. Measurement having the same configuration as the laser displacement meter 59 at the reference position E intersecting the axial line D on the inner surface of the bracket 64 fixed to the tip of the support 62 located at the intersecting position. A laser displacement meter 63 as a means is fixed, and an axial line D (same as the optical axis of the laser light emitted from the laser displacement meter 63) passing through the reference position E is an inclined body installed on the tip side. Crosses 53 inclined surfaces 56. The laser displacement meter 63 irradiates the arc-shaped surface 56 of the inclined portion 55 with laser light and receives the laser light reflected on the arc-shaped surface 56. Here, it is preferable to apply plating or the like to the arcuate surface 56 of the inclined body 53 in order to suppress a decrease in the amount of reflected light.

  Here, before the rotation of the slider 28 by the rotating means 50 is started (at the same time as the start of rotation or before the rotation starts), the inclined body 53 is positioned at a position shown by a solid line in FIG. After the end of the rotation 28 (at the same time as the end of the rotation or after the end of the rotation), the axis moves in the circumferential direction to the position indicated by the phantom line in FIG. Before the start of rotation, the arc intersects with the arcuate surface 56 at the start intersection A. On the other hand, after the end of the rotation of the slider 28, the arc intersects with the arcuate surface 56 at the end intersection B. The laser displacement gauges 59 and 63 rotate before the slider 28 starts to rotate by the rotating means 50 after the folding of the folding part 23 is finished and the folding arm 33 swings to the inner limit in the radial direction. Laser light is irradiated and received at least twice after the end of rotation of the slider 28 by the means 50, and the axial distance from the laser displacement meters 59, 63 to the arcuate surface 56 of the inclined body 53 is measured. By measuring the axial distance at least twice in this way, the laser displacement gauges 59 and 63 allow the axial line D passing through the reference position E and the arcuate surface before the rotation of the slider 28 by the rotating means 50 to start. After the end of the rotation at which the cylindrical member 26, the slider 28, and the folding arm 33 are completely rotated by the rotating means 50 from the start intersection A where the axis 56 intersects, the end intersection where the axial line D and the arcuate surface 56 intersect. Measure the axial distance C to B.

  In the present invention, the measuring means includes an electric micrometer that measures the axial movement amount of the probe whose tip is in contact with the arcuate surface 56, that is, the axial distance C, using a differential transformer, or the start intersection A. And an imaging tube that reads an axial distance C between the end intersection point B from the image. Then, the axial distance C (measurement result) measured as described above is input from the laser displacement gauges 59 and 63 to the determining means 66 such as a personal computer. At this time, the determining means 66 is input. Based on the measured result, the rotation angle of the slider 28 is obtained by calculation, and then the obtained rotation angle is compared with the predetermined angle stored in advance in the judging means 66, so that the rotation angle is the predetermined angle. Specifically, it is determined whether or not the rotation angle is within an allowable range of a predetermined angle. When the rotation angle is outside the allowable range of the predetermined angle, an abnormal signal is output to a monitor, a lamp, a buzzer, etc., not shown, and a warning is given to the worker.

  As described above, before the start of the rotation of the slider 28, from the start intersection A where the axial line D passing through the reference position E and the arcuate surface 56 of the inclined body 53 that rotates integrally with the slider 28 intersect, After the end of rotation, after measuring the axial distance C to the end intersection B where the axial line D and the arcuate surface 56 intersect with each other by the measuring means (laser displacement meters 59, 63), the measurement result by the measuring means is obtained. If the rotation angle of the slider 28 is obtained based on the determination means 66 to determine whether or not the obtained rotation angle is a predetermined angle, an encoder or the like can be used while the rotation angle is simple. It is possible to measure with higher accuracy than when using it, and this makes it easy to avoid situations where the rotation angle is larger or insufficient than the predetermined angle, and troubles in the subsequent process To prevent It can be. In the present invention, the axial distance from the laser displacement gauges 59, 63 to the arcuate surface 56 of the inclined body 53 may be constantly (continuously) measured by the laser displacement gauges 59, 63. Here, the measurement means is composed of the laser displacement meters 59, 63 installed at the reference position E as described above, and by measuring the distance from the laser displacement meters 59, 63 to the arcuate surface 56, the starting intersection point is obtained. If the axial distance C from A to the end intersection B is measured, the axial distance C from the start intersection A to the end intersection B can be measured without contact and with high accuracy.

  Here, the intersection angle between the arc-shaped surface 56 of the inclined portion 55 and the plane perpendicular to the axis of the forming drum 11 (main shaft 12) is a constant angle throughout the arc-shaped surface 56. As a result, the arc-shaped surface 56 is The flat surface is inclined at a constant angle with respect to the axially outer end surface of the slider 28. In this way, the rotation angle of the slider 28 can be easily obtained from the axial distance C from the start intersection A to the end intersection B using a simple arithmetic expression. Here, when the arcuate surface 56 is a plane having a constant inclination angle, the inclination angle of the arcuate surface 56 with respect to the axially outer end surface of the slider 28 is preferably within a range of 10 to 30 degrees. The reason is that if the tilt angle is less than 10 degrees, the value of the axial distance C is small, so that the measurement accuracy may be insufficient. On the other hand, if it exceeds 30 degrees, the arcuate surface 56 This is because the amount of feedback of the laser beam reflected by the laser beam decreases, and the length of the inclined body 53 in the axial direction increases, which may cause interference with other devices.

  In the present invention, the arcuate surface is recessed toward the slider 28 (inward in the axial direction), bulges outward from the slider 28 in the axial direction (becomes convex), or is bent in a wave shape. May be. Further, in this embodiment, the laser displacement meters 59 and 63 allow the axial distance from the laser displacement meters 59 and 63 to the arcuate surface 56 when the slider 28 is positioned at the axially outer limit, and the slider While measuring the axial distance from the laser displacement gauges 59, 63 to the arcuate surface 56 when 28 is positioned at the inner limit in the axial direction, the measurement result is output to the determining means 66. It is determined whether or not the folding arm 33 has swung to the radially inner limit or the radially outer limit. In this way, the laser displacement gauges 59 and 63 can be shared for detecting the swinging of the folding arm 33, whereby it is possible to easily confirm whether or not the folding work has been completed and the structure. Can be simplified and the production cost can be reduced.

Next, the operation of the first embodiment will be described.
First, after setting a pair of bead cores 20 with a stiffener 19 at a predetermined position of a tire constituent member 18 formed by a molding drum different from the molding drum 11, the tire constituent member 18 and the bead core 20 with a stiffener 19 are conveyed by a conveying means. As shown in FIG. 2, the sheet is transported from another molding drum to the molding drum 11 and loosely fitted to the outside of the molding drum 11. To do. Next, the bead lock body 15 is synchronously moved outward in the radial direction, and the tire constituent member 18 and the bead core 20 are supported by the bead lock body 15 from the inner side in the radial direction. At this time, the tire constituent member 18 is partitioned into a main body portion 22 located between the bead cores 20 and a turned-up portion 23 located outside the bead core 20 in the axial direction.

  Next, the movable body 14, the cylindrical member 26, the slider 28, and the folding arm 33 are integrally moved inward in the axial direction by the driving mechanism to bring them closer to each other, and the tire constituting member 18 (main body portion 22) between the bead cores 20 is moved. ) A pressurized fluid is supplied from the bulging means. As a result, while the forming drum 11 supports the bead core 20 and the tire constituent member 18 from the inside in the radial direction, the main body portion 22 of the tire constituent member 18 bulges and deforms to the outer side in the radial direction until the cross section is substantially semicircular. The folded portion 23 located on the outer side in the axial direction from the bead core 20 remains cylindrical. At this time, the support body 62 moves radially inward to the intersecting position and supports the tip end of the main shaft 12. In this way, when the cylindrical member 26 moves inward in the axial direction and stops, while the slider 28 is positioned at the outer limit in the axial direction and the folding arm 33 swings to the inner limit in the radial direction, the laser displacement meter 59 , 63 measures the distance L from the laser displacement gauges 59, 63 to the arcuate surface 56 based on the reflected light from the arcuate surface 56, and inputs the measurement result to the judging means 66. Next, pressurized fluid is supplied from the pressurized fluid source to the outer chamber 36b of the cylinder chamber 36, and the pair of sliders 28 are moved together with the folding arm 33 in the axial direction, in this case, to the inner limit in the axial direction. At this time, each folding arm 33 swings so as to expand outward in the radial direction centering on the outer end portion, and the folding roller 34 moves radially outward while being in contact with the folding portion 23 (see FIG. 6). .

  As a result, the folded portion 23 is folded along the main body portion 22 around the bead core 20 by the inner end portion (folded roller 34) of the folded arm 33, and the tire intermediate G is formed. At this time, each folding roller 34 is pressed against the folding portion 23 by the urging force applied from the elastic band 35 via the folding arm 33, and the folding portion 23 is pressed against the stiffener 19 and the main body portion 22. As described above, when the slider 28 moves to the inner limit in the axial direction and the folding arm 33 swings to the outer limit in the radial direction, the laser displacement meters 59 and 63 are used for the laser based on the reflected light from the arcuate surface 56. The distance M from the displacement gauges 59, 63 to the arcuate surface 56 is measured, and the measurement result is input to the judging means 66. At this time, the judging means 66 compares the difference (change amount) between the distance L and the distance M with the axial stroke amount of the slider 28 stored in advance, and the folding arm 33 swings to the outer limit in the radial direction. It is determined whether or not the folding operation of the folding unit 23 has been completed. As a result, it is possible to prevent the green tire in which the turn-back portion 23 has not been turned back from being conveyed to the subsequent process.

  When the folding of the folding portion 23 is completed as described above, pressurized fluid is supplied from the pressurized fluid source to the inner chamber 36a of the cylinder chamber 36, and the slider 28 is moved axially outward together with the folding arm 33, here in the axial direction. Move to the outer limit. At this time, each folding arm 33 swings to close to the radially inner limit by the elastic restoring force of the elastic band 35, and the folding roller 34 returns to the radially inner limit while being in rolling contact with the tire intermediate body G ( (See FIG. 7). Thus, when the slider 28 moves to the outer limit in the axial direction and the folding arm 33 swings to the inner limit in the radial direction, the laser displacement meters 59 and 63 are based on the reflected light from the arcuate surface 56. The distance N from 59, 63 to the arcuate surface 56 is measured, and the measurement result is input to the judging means 66. The value at this time is the same as the distance L. The distance N is measured by the laser displacement meters 59 and 63 because the slider 28 rotates after the measurement operation, so that the axial direction passing through the reference position E from the laser displacement meters 59 and 63 before the rotation of the slider 28 starts. It is also a measurement of the distance to the starting intersection A where the line D and the arcuate surface 56 of the inclined body 53 intersect. At this time, the judging means 66 compares the distance L and the distance N, and whether or not the folding arm 33 has swung to the inner limit in the radial direction, that is, whether or not the slider 28 and the folding arm 33 have returned to the standby position. Determine whether. Thereby, the next work can be advanced without time loss.

  Next, pressurized fluid is supplied from the pressurized fluid source to the outer chamber 42 b of the cylinder chamber 42, and the piston 41 moves inward in the axial direction. The movement of the piston 41 inward in the axial direction is performed via the connecting link 44. To the cylindrical member 26. At this time, since the cylindrical member 26 is restricted from moving in the axial direction but is allowed to rotate, the connecting link 44 swings, and the slider 28 moves together with the cylindrical member 26 and the folding arm 33 to the main shaft 12 and the movable body 14. Rotate by a predetermined angle less than 360 degrees in the circumferential direction. Thereby, the inclined body 53 attached to the slider 28 moves in the circumferential direction from the position indicated by the solid line in FIG. 3 to the position indicated by the phantom line. Here, in the present embodiment, the above-mentioned predetermined angle is an odd multiple of an angle that is a half of an intersecting angle at which the rolling paths of the two folding rollers 34 adjacent in the circumferential direction intersect (here, 1 times). Is the angle.

  Then, after the end of the rotation of the slider 28, the laser displacement meters 59, 63 are based on the reflected light from the arc-shaped surface 56, and the axial line D and the arc-shaped surface 56 are separated from the laser displacement meters 59, 63. The distance P to the intersecting end intersection B is measured, the axial distance C from the start intersection A to the end intersection B is measured based on the values of the distance N and the distance P, and the measurement result is determined by the judging means 66. To enter. At this time, the judgment means 66 obtains the rotation angle of the slider 28 by calculation based on the input measurement result, that is, the value of the axial distance C, and then stores the obtained rotation angle and the judgment means 66 in advance. The predetermined angle is compared, and it is determined whether or not the rotation angle is a predetermined angle, specifically, whether or not the rotation angle is within an allowable range of the predetermined angle. When the rotation angle is outside the allowable range of the predetermined angle, a warning is issued because the uncompressed region cannot be sufficiently crimped even by re-crimping as described later.

  Next, pressurized fluid is supplied from the pressurized fluid source to the outer chamber 36b of the cylinder chamber 36, and the slider 28 is moved to the inner limit in the axial direction together with the folding arm 33. At this time, each folding arm 33 swings so as to expand radially outward with the outer end as the center, and the folding roller 34 moves to the radially outer limit again while being in contact with the folded portion 23 that has already been folded. However, since the folding roller 34 is located at a position deviated in the circumferential direction by a predetermined angle from the circumferential position at the time of the first folding as described above, the folding roller 34 moves in the circumferential direction from the first moving path. As a result, the folding roller 34 presses the unbonded area of the folded portion 23 located between the already-bonded areas against the stiffener 19 and the main body 22 for pressure bonding. By such first and second crimping, the folded portion 23 can be crimped to the stiffener 19 and the main body portion 22 with almost no gap while suppressing air entry in the entire region. At this time, the support body 62 is retracted by moving outward in the radial direction, and interference with a belt / tread band conveying means, the conveying mechanism 60, and the conveying means of the tire constituent member 18, which will be described later, is prevented.

  Next, a cylindrical belt tread band formed by another forming drum is carried outside the tire intermediate body G, and the movable body 14 and the bead lock mechanism 21 are moved further inward in the axial direction to approach each other. At this time, pressurized fluid is supplied into the main body 22 as necessary. As a result, the tire intermediate body G is deformed into a substantially toroidal shape, and the radially outer end thereof is pressed against the inner periphery of the belt tread band to form a green tire. Next, the slider 28 is returned to the outer limit in the axial direction and the folding arm 33 is returned to the inner limit in the radial direction, and the cylindrical member 26 and the slider 28 are rotated by the same angle in the opposite direction as described above to return to the initial rotation position. Next, after the molded green tire is taken out from the molding drum 11 by the transport mechanism 60, it is transported and stored in a vulcanizer, and vulcanized under high temperature and high pressure to be a pneumatic tire, for example, a pneumatic tire for trucks and buses. Manufacturing.

  The present invention can be applied to the industrial field of manufacturing a green tire by folding a folded portion of a tire constituent member around the bead core.

11 ... Molding drum 18 ... Tire components
20 ... Bead core 22 ... Main body
23 ... Folding part 28 ... Slider
33 ... Folding arm 37 ... Moving means
50 ... Rotating means 53 ... Inclined body
56… Arc surface 59, 63… Measuring means
66 ... Judgment means A ... Start intersection B ... End intersection C ... Axial distance D ... Axial line E ... Reference position

Claims (6)

    A step of bulging the main body of the tire constituent member located between the bead cores radially outward while supporting the paired bead core and the cylindrical tire constituent member from the radially inner side, and an axially outer side of the bead core By moving a pair of sliders that can move in the axial direction to the inside in the axial direction, the outer ends of the sliders are swingably supported by the sliders, and the inner ends of a plurality of folded arms that are spaced apart in the circumferential direction. A step of turning the folded portion of the tire constituent member positioned axially outside the bead core by the end portion, a step of moving the pair of sliders outward in the axial direction and separating the folded arm from the folded portion; The step of rotating the slider together with the folding arm by a predetermined angle of less than 360 degrees and the reference position before starting the rotation of the slider After the end of rotation of the slider, from the starting intersection where the passing axial line intersects the arcuate surface of the inclined body that rotates integrally with the slider and has an arcuate surface that is inclined with respect to the circumferential direction at the axially outer end. A step of measuring an axial distance to an end intersection where the axial line and the arcuate surface intersect, and a rotation angle of the slider is obtained based on the measurement result, and the obtained rotation angle is the predetermined angle. And a step of determining whether or not there is a method for manufacturing a green tire.     A molding drum capable of bulging the body portion of the tire constituent member located between the bead cores radially outward while supporting the paired bead core and the cylindrical tire constituent member from the radially inner side, and a shaft from the bead core A pair of sliders arranged on the outside in the axial direction and movable in the axial direction, a plurality of folding arms arranged on the outer ends of the sliders so as to be swingable and spaced apart in the circumferential direction, and the sliders as shafts Moving means that folds around the bead core the folded portion of the tire constituent member positioned axially outside the bead core by the inner end of the folded arm when the slider moves inward in the axial direction; Rotating means for rotating the slider together with the folding arm by a predetermined angle of less than 360 degrees, and rotating integrally with the slider to the axial outer end Before the start of rotation of the slider, the inclined body having an arcuate surface inclined with respect to the circumferential direction, and from the start intersection where the arc-shaped surface passing through the reference position and the arc-shaped surface intersect, after the end of rotation of the slider, Measuring means for measuring the axial distance to the end intersection where the axial line and the arcuate surface intersect, and the rotation angle of the slider is obtained based on the measurement result by the measuring means, and the obtained rotation angle is the predetermined angle. An apparatus for producing a green tire, comprising: a judging means for judging whether or not there is any.     The green tire manufacturing apparatus according to claim 2, wherein an intersection angle between the arc-shaped surface and a plane perpendicular to the axis of the forming drum is a constant angle in the entire arc-shaped surface.     The green tire manufacturing apparatus according to claim 2 or 3, wherein an outer end in the radial direction of the inclined body is positioned radially inward from a folding arm that swings to an inner limit.     The measuring means comprises a laser displacement meter installed at a reference position, and the axial distance from the start intersection to the end intersection is measured by measuring the distance from the laser displacement meter to the arcuate surface. The manufacturing apparatus of the green tire as described in any one of Claims 2-4.     With the laser displacement meter, the axial distance to the arcuate surface when the slider is located at the axially outer limit, and the axial distance to the arcuate surface when the slider is located at the axially inner limit 6. The apparatus for manufacturing a green tire according to claim 5, wherein the measurement result is output to the determination means, and whether or not the folding arm swings to the inner limit or the outer limit is determined by the determination means.

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